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Our wireless measuring system
Cobra4 wireless Experimentation without limits in science classes
es Featur
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excellence in science
Cobra4 wireless
Cobra4 New ways of capturing measurement data
Mobile experiments
Do you wonder how you could possibly raise your students’ interest in the natural sciences in this highly technical world? With Cobra4, PHYWE offers you the solution to this question. Our wireless measurement data recording system Cobra4 opens up completely new, unprecedented didactic ways of conveying scientific interrelations in a convincing and inspiring way. An Example: Up to now, computer-assisted demonstration experiments have always been bound to the location of the teacher’s computer, which is usually fixed and rather far away from the students. As a result, it was not always easy to integrate students into the experiments. Now, with Cobra4, the location of the computer is not important any longer. Since the system is completely wireless, you can perform the experiments in the middle of the classroom together with your students. As a result, the students are perfectly integrated into the teaching and learning process, in which they can experience the natural sciences in close quarters. In addition, completely new subject areas can be treated. For example, the students can directly measure certain quantities in reference systems that are in motion.
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Natural sciences in context Another example: If you combine the system with a small laptop (netbook), you can perform field experiments concerning, for example, forces and accelerations, or examine the pulse and physiology during physical education classes. One of the students rides a bike, skates in a halfpipe, or runs, and the other students observe the variation of the measurand in real-time on the monitor of the netbook. The interrelations become clearer thanks to the connection between the measurands and the observed state. As a result, the natural sciences can be experienced live and better comprehended. Another advantage is that groups of students can independently acquire knowledge of the interrelations and then present their findings live with a beamer, which is a method that fosters several core competences at a time.
Cobra4 still has even more to offer, however. With the Cobra4 mobile hand-held measuring instrument, you can experience exciting project days with your students and later evaluate your experiments with our software measure. The hand-held measuring instrument is also suitable for demonstration experiments without a PC. The measurement data can be transmitted to one or several digital large-scale displays with the aid of a radio adapter. This gives you the freedom to perform demonstration experiments in the middle of the classroom together with your students.
fied by the system and then you can immediately start with the measurements. The functionality of the software includes all of the relevant elements for the comfortable and trouble-free execution of the experiments. You can start measure at any time simply by pressing a button.
Ready-prepared experiments with reference to our everyday lives Apart from numerous ready-prepared demonstration and student experiments in physics, chemistry, and biology, the category of everydaylife phenomena allows you to reach your students where their knowledge of scientific relations can be combined with practical applications.
Measuring the height of towers
The sensors, which are suitable for all of the basic units, cover entire subject areas, such as thermodynamics, weather, or electricity.
Intuitive and easy operation Just like all the other computer-assisted experiments by PHYWE, Cobra4 is also integrated into our proven high-performance evaluation software measure. For the measurement software for Cobra4, we paid particular attention to intuitive operation. The sensors are automatically identi-
Measurement of everyday-life phenomena: floating and sinking?
Cobra4 offers you extensive comfort, flexibility, and completely new experiment opportunities. Computer-assisted measurements and evaluations are becoming increasingly easy. Science experiments can now once more come to the fore.
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Cobra4 wireless
Precise, wireless measurements – with our Cobra4 measurement system
How can you obtain reliable measurement results with minimum effort and in next to no time? With the Cobra4 products by PHYWE. Thanks to the imaginative and perfected technology, we guarantee the quality and flexibility that you need for you science classes.
Benefit from many, many advantages: ■
New didactic opportunities: you take the experiments to your students
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Trouble-free measurement of moving objects (e.g. linear motion, rotation, acceleration, pendulums, etc.)
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Trouble-free measurement in closed systems (e.g. propagation of pressure in a plastic bag, temperature in a closed refrigerator, etc.)
Cobra4 Wireless Manager Ref. no. 12600.00 ■
Cobra4 Wireless-Link Ref. no. 12601.00
Up to 99 Cobra4 Wireless devices can be connected in a network
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Easy, quick, and safe connection thanks to a unique radio protocol that cannot be disturbed by any other devices
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Automatic management of the sensor data together with the measure Cobra4 software
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More comfort: no disturbing cables that limit your mobility
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Higher safety: the PC can be located far away from the experiment and is, thereby, protected against damage through hazardous substances, e.g. in chemistry classes
USB device for radio-based communication with Cobra4 devices, Wireless-Link, and Remote-Link. Technical data: ■ Current consumption:
< 100 mA
Configuration of a parallel wireless measurement station at the push of a button
■ Supply voltage (USB-powered device):
5V
■ Output power, radio:
1 mW
■ Data rate (burst):
40,000 values/s
■ Range, without obstacles:
20 m
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Automatic identification and assignment by the Cobra4 Wireless Manager ■ Can be connected to all of the Cobra4 Sensor-Units ■ Automatic sensor identification of all of the Sensor-Units ■
Cobra4 Remote-Link Ref. no. 12602.00 “Remote control” of Cobra4 Starting and stopping of a measurement series regardless of the location of the PC ■ Measurement of single values regardless of the location of the PC ■
Interface module for the radio-based transmission of sensor values. Technical data: ■ Power supply:
2 x Mignon/(AA) storage batteries
■ Current consumption:
< 300 mA
■ Output power, radio:
1 mW
■ Data rate, burst:
40,000 values/s
■ Maximum number of Cobra4 Wireless-Links on the network: 99
■ Range, without obstacles:
20 m
■ Dimensions L x W x H:
75 x 25 x 10 mm
■ Dimensions L x W x H:
125 x 65 x 35 mm
■ Weight
20 g
■ Weight:
200 g
■ Comes with 2 Mignon/storage batteries, 2700 mAh
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Cobra4 wireless
Cobra4 USB-Link – for particularly quick measurements
Cobra4 Mobile-Link – our mobile hand-held measuring instrument for numerous measurands
Direct connection to a PC with a USB cable
Hand-held measuring instrument used as a data logger
Optimal for: ■ Demonstration and student experiments ■ Particularly quick measurements (acoustics, electricity, etc.)
Optimal for: ■ Field experiments with groups of students during project days, excursions, etc. ■ Student experiments without a PC ■ Demonstration experiments without a PC (with Display-Connect and a digital large-scale display)
Device for the mobile measurement and storage of the measurement values on an SD memory card. With a USB interface for the data transfer to a PC after the measurement. Technical data: ■ Power supply:
2 x Mignon/(AA) storage batteries
■ Current consumption:
< 300 mA
■ Data storage:
SD card, 2 GB max.
■ Data rate:
1,000 values/s
■ Dimensions L x W x H:
155 x 65 x 35 mm
■ Weight:
200 g
Comes with 2 Mignon storage batteries (2700 mAh), an SD memory card (2 GB), operating instructions, and the evaluation software measure (DVD).
Like a digital camera: modern SD card for storing the measurement values.
Cobra4 Mobile-Link Ref. no. 12620.55 Up to 1,000 measured values per second. ■ Data can be stored on an SD memory card and are, thereby, individually identifiable ■ Automatic identification of all the Cobra4 Sensor-Units ■ Protected against splash water, safe outdoor experimentation ■ Easy, intuitive operation ■ The evaluation software measure can be used FREE of charge ■
Ohm’s law with the Cobra4 USB-Link Safe connection to the sensor thanks to snap-in locks and a 15-pin Sub-D connector.
Cobra4 USB-Link Ref. no. 12610.00 Up to 400,000 measured values per second ■ Can be combined with other USB-Links and Wireless-Links/Wireless-Managers/Remote-Links ■ Automatic identification of all the Cobra4 Sensor-Units ■ Power supply via the USB connection ■
The Cobra4 USB-Link is an interface module for the transmission of sensor values to a PC via a USB connection. Technical data: ■ Power supply:
via the PC
■ Current consumption:
< 300 mA
■ Data rate (burst):
400,000 values/s
■ Dimensions L x W x H:
125 x 65 x 35 mm
■ Weight:
100 g
Comes with a DVD with experiment descriptions, the evaluation software measure Cobra4, all the necessary device drivers, a USB cable, and operating instructions.
excellence in science
Quality of various water samples based on their conductivity.
Voltage and current measurement (student experiment).
Cobra4 Display-Connect with a digital large-scale display for wireless data transfer.
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Cobra4 Our measure Cobra4 software: Modern, intuitive, and easy to use Table/General Configuration Apart from the tab Devices, the navigator also has two
wireless Software measure Cobra4 Single-user and school licence Ref. no. 14550.61 System requirements: PC with Pentium 3 or higher, 512 MB RAM, 1 GB of free storage space on the hard disk, DVD drive, USB 2.0, Microsoft® Windows XP or higher.
other tabs.
measure main program You can switch between the measurement window with your measurements and the measure main program for the data
Table: Click this tab to see a table with the current measure-
evaluation at all times. This means that you can measure
ment values during the measurement.
and simultaneously work on the data of another measure-
General Configuration: On this tab, you can define the
ment. There are numerous options:
measuring frequency, method for starting and stopping
■ Optimisation of the graphical representation of the
measurements, as well as other settings concerning the
measurement data
execution of a measurement.
■ Saving or printing of the measurement data ■ Evaluation tools: peak analysis, integral, extremes,
Fourier analysis, curve fitting, equivalence point, linear regression, etc. ■ Conversion of the measurement values, such as sine,
square, root, logarithms, etc.
Navigator
■ Combination of two measurement curves, e.g. U*I in
order to calculate the power Everything at a glance. The navigator allows you to:
■ Export or import of data via the clipboard into/from
■ view all of the connected sensors
other programs, such as Excel, Word, etc.
■ view the state of the sensors (active, inactive)
■ Function generator
■ change the sensor parameters by double-clicking ■ add calculated channels (virtual device) that can be used,
Loading experiments
for example, for the online conversion of measured values (e.g. °C into K) or the combination of the measured values
Numerous experiment examples can be loaded particularly
of different measuring channels (e.g. calculation and
easily. Along with an extensive experiment description
representation of the resistance based on the current
in PDF format with a set-up illustration, material list,
and voltage)
experiment procedure and results, the system also auto-
Measurement window
matically loads all the necessary parameters. They include:
All of the measured values are immediately dis-
■ sensor settings
played. The following views can be selected for
■ representations
every measuring channel:
■ multigraph/virtual device
■ Digital measurement window
In addition, example measurements can be loaded into
■ Analog measurement window
the measure main program.
■ Graphs
Keywords in the experiment examples
■ Additional measurement graphs that can
be scaled as desired ■ Double-click or right-click to open the setting
windows Changes can also be made during a measurement. Up to 1,000,000 data points can be recorded per measurement series.
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DVD-ROM re Cobra4 su a e m E E t descripThe FR experimen e th f o ll mple includes a s, and exa ration file u g fi n co tions, ents. measurem
In addition to the experiment examples, the relevant keywords are also displayed. Click a keyword to call up the help text with detailed explanations. As a result, the experiments can be performed easily, quickly, and safely.
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Cobra4 wireless
Completely new opportunities – for student and demonstration experiments
Demonstration experiments Unprecedented opportunities can be realised with the wireless PC-assisted variant of Cobra4. Think of fixed teacher PCs. Surely you have been annoyed sometimes that your PC is located so far away from your students, thus limiting the opportunities for computer-assisted experiments. With Cobra4 Wireless, everything is different: There are no disturbing cables so that you can move freely in the classroom and set up the experiment right among your students. As a result, the students are integrated better into the teaching and learning process and can experience and comprehend the natural sciences as closely as possible. In addition, completely new subject areas, such as, for example, moving reference systems (e.g. weightlessness during a parabolic flight) can be directly measured.
Use of Cobra4 in combination with the TESS student experiments
Fusion of demonstration and student experiments The student performs an experiment and the measurement will be transferred to your PC by radio. At the same time, the measurement curve will be projected with the aid of a beamer. On the PC, you can then work on the results together with your class and with the evaluation program measure. Alternatively, the students can evaluate the experiment at home with the free measure software. Measurements, where it is not a measurement curve that matters but a manageable number of individual values, do not require a PC at all. The students can perform the measurement (e.g. samples that they brought to the class) one after the other with the Mobile-Link and transmit their results to the large-scale digital display with the aid of the Display-Connect unit. The results are then visible for everyone.
Field measurement with the Cobra4 Mobile-Link
Student experiments Many schools already use the TESS student experiment system. A large number of student experiments for Cobra4 that use TESS are already Use of Cobra4 in combination with the demonstration system “Natural sciences on the board”
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documented in student worksheets and teacher sheets - either in the Cobra4 handbook or directly in the menu of the Cobra4 software. The high level of user-friendliness of Cobra4 with the automatic sensor identification function facilitates the independent computer-assisted execution of experiments. In addition, the Cobra4 MobileLink is ideally suitable for field experiments with groups of students.
Handbook Cobra4: physics, chemistry, biology, everyday-life phenomena. Computer-assisted experiments with Cobra4
Cobra4 Handbook Ref. no. 01330.02 Conceptional descriptions of demonstration and student experiments in the fields of physics, chemistry, and biology. Special emphasis is placed on the advantages of the wireless transmission of measurement data with the Cobra4 system. Included for the first time are interdisciplinary experiments concerning the phenomena of our everyday lives. Content: ■ Phenomena of our everyday lives: household, outdoors, hobbies, technology, and traffic ■ Physics: mechanics, thermodynamics, and electricity ■ Chemistry: electrochemistry ■ Biology: ecology ■ TESS: mechanics, heat, and electricity/ electronics
Cobra4 Display-Connect with a digital large-scale display for wireless data transfer
10 11
Experiment examples – physics
Cobra4
Experiment examples – chemistry
wireless Ohm’s law
P1330360
Manual pH titration
P1510260
The relation between the electrical voltage and the resulting current is measured with various test resistors. The quotient of the voltage and current is a constant value that characterises the component. The various measurement curves can be displayed in a particularly clear manner in a graph.
pH titrations are among the most frequent tests of acids and alkaline solutions. If a pH electrode is used to determine the end point, it also is possible to test highly coloured solutions and to observe the changes of the pH value during the entire reaction. The Cobra4 interface records and evaluates the measurement data in a particularly comfortable way. If a burette is used as the volumeter, the titration solution can be added particularly easily.
Excerpt from the equipment list Excerpt from the equipment list
Quantity
Name
Ref. no.
Quantity
Name
Ref. no.
1
Cobra4 Wireless Manager
12600.00
1
Cobra4 Wireless Manager
12600.00
1
Cobra4 Wireless-Link
12601.00
1
Cobra4 Wireless-Link
12601.00
1
Cobra4 Sensor-Unit “pH and 2 x temperature NiCr-Ni”
12630.00
1
Cobra4 Sensor-Unit “Electricity”
12644.00
1
Holder for Cobra4 with a stand
12680.00
1
Software “measure” for Cobra4
14550.61
1
Software “measure” for Cobra4
14550.61
Also required: cables, other components, small parts, and a PC
Generation of alternating voltage, rectification, and smoothing
Also required: small parts, support materials, chemicals, and a PC
P1331360
Oscillating reaction
P1510460
An alternating voltage is induced in a coil in the (alternating) field of a magnet that moves periodically. The characteristic of a diode, i.e. the fact that it lets the electrical current pass only in one direction is used to rectify the induced alternating voltage. A capacitor that is connected in parallel to the consumer (resistor) smoothes the rectified alternating voltage.
Observing oscillating reactions, e.g. the Briggs-Rauscher reaction, is highly fascinating. If a platinum electrode and an Ag/AgCl reference electrode are immersed into the reaction mixture, the electrochemical potential that changes along with the colour can be observed potentiometrically.
Excerpt from the equipment list Excerpt from the equipment list
Name
Ref. no.
Quantity
Name
Ref. no.
1
Cobra4 Wireless Manager
12600.00
1
Cobra4 Wireless Manager
12600.00
1
Cobra4 Wireless-Link
12601.00
1
Cobra4 Wireless-Link
12601.00
1
Cobra4 Sensor-Unit “pH and 2 x temperature NiCr-Ni”
12630.00
1
Cobra4 Sensor-Unit “Electricity”
12644.00
1
Holder for Cobra4 with a stand
12680.00
1
Software “measure” for Cobra4
14550.61
1
Software “measure” for Cobra4
14550.61
Also required: cables, other components, small parts and a PC
Specific heat capacity of water
Also required: small parts, support materials, chemicals, and a PC
P1349160
Temperature-dependence of the conductivity
P1510160
The electrical conductivity depends not only on the type and concentration of the electrolytes, but also on other parameters. If the temperature increases, one can usually also observe an increase in conductivity. At some point, however, a certain limit is reached, as of which the conductivity decreases even if the temperature increases further. For aqueous solutions, this value is approximately 90°C. The temperature-dependence of the conductivity can be studied with this experiment.
Cold water is filled into a calorimeter and heated with a heating coil. The relation between the heating power and the temperature rise is displayed and the specific heat capacity of water is calculated.
Excerpt from the equipment list Quantity
Name
Ref. no.
Excerpt from the equipment list
1
Cobra4 Wireless Manager
12600.00
Quantity
Name
Ref no.
2
Cobra4 Wireless-Link
12601.00
1
Cobra4 Wireless Manager
12600.00
1
Cobra4 Sensor-Unit “Electricity”
12644.00
1
Cobra4 Wireless-Link
12601.00
1
Cobra4 Sensor-Unit “Temperature, semiconductor –20...+110°C”
12640.00
1
Cobra4 Sensor-Unit “Conductivity + (Pt 1000)”
12632.00
1
Student calorimeter
04404.88
1
Holder for Cobra4 with a stand
12680.00
1
Software “measure” for Cobra4
14550.61
1
Software “measure” for Cobra4
14550.61
Also required: small parts, support materials, chemicals, and a PC
Also required: power supply unit, calorimeter, cables, small parts, and a PC
excellence in science
Quantity
excellence in science
12 13
Experiment examples – biology
Experiment examples – applied sciences
Cobra4 wireless
Bergmann’s rule: loss of heat as a function of the surface area and volume of the body
P1351060
Why are energy-saving lamps so dark after they have been switched on?
Evidence of why animals in colder regions are larger than their close relatives in warmer regions. One reason is that larger animals have lower heat loss than smaller animals since the surface area of their body in relation to their volume is smaller than that of small animals.
P1530060
Energy-saving lamps (compact fluorescent lamps) are increasingly replacing standard light bulbs. However, they need some time until they reach maximum brightness, since their light intensity depends on the temperature.
Excerpt from the equipment list Excerpt from the equipment list
Quantity Name
Ref. no.
1
Cobra4 Wireless Manager
12600.00 12601.00
Quantity
Name
Ref. no.
1
Cobra4 Wireless-Link
1
Cobra4 Wireless Manager
12600.00
1
Cobra4 Sensor-Unit “Weather:
2
Cobra4 Wireless-Link
12601.00
1
Software “measure” for Cobra4
14550.61
2
Cobra4 Sensor-Unit “Temperature, semiconductor -20…+110°C”
12640.00
12670.00
1
Holder for Cobra4 with a stand
12680.00
1
Software “measure” for Cobra4
14550.61
Small parts, support materials, and a PC are also required
Small parts, support materials, and a PC are also required
Comparison of the heat capacity of water and earth
air pressure, humidity, temperature, light intensity, and altitude”
P1350960
Floating and sinking
P1530560
The difference in the temperature rise of earth and water under heat radiation is studied. With the aid of this measurement, the term “heat capacity” can be introduced quickly and easily. The students will learn about the characteristics that are responsible for temperature changes. A practical example that can be stated is hot sand on a beach.
The buoyancy force is equal to the magnitude of the weight of the displaced fluid. This experiment uses objects from our everyday lives (Coke bottle, modelling clay, and an egg) to determine as to how the buoyancy depends on the mass and volume of the object and on the density of the fluid in accordance with Archimedes’ principle.
Excerpt from the equipment list
Excerpt from the equipment list
Quantity
Name
Ref. no.
Quantity
Name
Ref. no.
1
Cobra4 Wireless Manager
12600.00
1
Cobra4 Wireless Manager
12600.00
2
Cobra4 Wireless-Link
12601.00
1
Cobra4 Wireless-Link
12601.00
1
Software “measure” for Cobra4
14550.61
1
Cobra4 Sensor-Unit “Force +/- 40 N”
12643.00
2
Cobra4 Sensor-Unit “Temperature, semiconductor -20…+110°C”
12640.00
1
Software “measure” for Cobra4
14550.61
Small parts, support materials, and a PC are also required
Conductivity of various water samples
Small parts, support materials, and a PC are also required
P1520060
Measuring the height of a tower
P1520362 The height of a tower can be determined with the aid of the weather sensor. The weather sensor calculates the change in altitude as a function of the change in air pressure with the aid of the barometric equation.
The conductivity of various drinking water samples is measured with a conductivity sensor and the results are compared with each other as well as the values of distilled mineral, spring, and river water. This experiment shows how much the quality of the drinking water of various locations in the same region may vary. The comparison leads to surprising results.
Excerpt from the equipment list Quantity
Name
Ref. no.
Excerpt from the equipment list
1
Cobra4 Wireless Manager
12600.00
Quantity Name
1
Cobra4 Wireless-Link
12601.00
1
1
Software “measure” for Cobra4
14550.61
1
Cobra4 Sensor-Unit “Conductivity with a stainless-steel sensor”
12633.00
excellence in science
12620.55
Cobra4 Sensor-Unit “Weather: air pressure, humidity, temperature, light intensity, and altitude”
Small parts, support materials and a PC are also required
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Cobra4 Mobile-Link, set incl. storage batteries, an SD memory card, a USB cable, and the “measure” software
1
Ref. no.
12670.00
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Cobra4
Cobra4 Sensor-Units Cobra4 Sensor-Unit “Temperature, semiconductor -20…110°C”
wireless 12640.00
Cobra4 Sensor-Unit “2x Temperature NiCr-Ni”
12638.00
The Cobra4 Sensor-Unit “Thermodynamics” is a microcontroller-controlled sensor for absolute pressure and temperature measurements. In order to measure the pressure in devices, the Sensor-Unit is equipped with an olive-type metal coupling with an external diameter of 8 mm. Via this coupling, the devices can be connected to the pressure sensor inside the housing. The Sensor-Unit can also be equipped with two NiCr-Ni thermocouples (type K) in order to measure up to two temperatures simultaneously or to measure a temperature difference and absolute pressure simultaneously. The unit can be connected to the Cobra4 Wireless-Link, Cobra4 Mobile-Link, or Cobra4 USB-Link. Technical data: Temperature Pressure Measuring range: -200°C to +1200°C 0 to 2000 hPa, absolute Resolution: 0,1 K 0,1 hPa Accuracy: corresponds to the accuracy of the sensors that are used Max. data throughput rate: 5 Hz Dimensions: approx. 62 mm x 110 mm x 35 mm
Cobra4 Sensor-Unit “Chemistry, pH, and 2 x temperature NiCr-Ni”
12630.00
The Cobra4 Sensor-Unit “pH and 2x temperature NiCr-Ni” is a microcontroller-controlled sensor for pH, potential, and temperature measurements. It can be equipped with two NiCr-Ni thermocouples (type K) and a combined pH measuring and reference electrode or a redox electrode in order to measure up to two temperatures and a pH or potential value simultaneously. The unit can be connected to the Cobra4 Wireless-Link, Cobra4 Mobile-Link, or Cobra4 USB-Link. Technical data: Temperature pH Potential Measuring range: -200°C to +1200°C 0 to 14 pH -2000 to +2000 mV Resolution: 0,1 K 0,01 pH 0,1 mV Accuracy: corresponds to the accuracy ±0,5% ±0,5% of the sensors that are used Max. data throughput rate: 5 Hz Dimensions: approx. 62 mm x 63 mm x 35 mm
Thermocouples NiCr-Ni (type K) Several different types of NiCr-Ni thermocouples with a standard type K 2-pin flat connector that is free from thermoelectric voltage. These thermocouples can be connected to the Cobra4 Sensor-Units “2x temperature” (12641.00), “Thermodynamics” (12638.00), and “Chemistry” (12630-00). Ref. no. Name Description 13615.02 Thermocouple NiCr-Ni, single type, Glass silk insulation, spot-welded tip; -40…+500°C Response time: approx. 2 s; l = -; = 1.0 – 2.0 mm Cable length: 1.5 m 13615.01 Thermocouple NiCr-Ni, microsheath, Magnesium oxide insulation, sheath made of stainless steel; -50…+1100°C Flexible: bend radius approx. 1 mm; l = 100 mm; = 0.5 mm Response time: < 1 s; Cable length: 2.0 m 13615.03 Immersion probe NiCr-Ni, stainless steel, For liquids and gases, thermocouple in a protective steel tube; -50…+1000°C Response time: approx. 5 s; l = 120 mm; = 3.0 mm; Cable length: 1.0 m 13615.05 Immersion probe NiCr-Ni, Teflon, For liquids and gases, thermocouple in a protective PTFE tube; -50…+300°C Response time: approx. 10 s; l = 250 mm; = 7.0 mm Cable length: 1.5 m 13615.04 Surface probe, NiCr-Ni, up to 1000°C To measure surface temperatures; thermocouple on a copper plate; Response time: approx. 3 s; l = 120 mm; = 4.0 mm (plate)
excellence in science
12631.00
12641.00
The Cobra4 Sensor-Unit “2x Temperature NiCr-Ni” is a microcontroller-controlled sensor for temperature measurements. It can be equipped with two NiCr-Ni thermocouples (type K) in order to measure up to two temperatures simultaneously or to measure a temperature difference. The unit can be connected to the Cobra4 Wireless-Link, Cobra4 Mobile-Link, or Cobra4 USB-Link. Technical data: Temperature measuring range: -200°C to +1200°C Resolution: 0.1 K Measuring accuracy: corresponds to the accuracy of the sensors that are used Max. data throughput rate: 5 Hz Dimensions: approx. 62 mm x 63 mm x 35 mm
Cobra4 Sensor-Unit “Thermodynamics, absolute pressure, and 2x temperature NiCr-Ni”
Cobra4 Sensor-Unit “pH, BNC connector”
The Cobra4 Sensor-Unit “pH, BNC connector” is a microcontroller-controlled sensor for pH and potential measurements. It can be equipped with a combined pH measuring and reference electrode or with a redox electrode in order to measure the pH or potential values. The unit can be connected to the Cobra4 Wireless-Link, Cobra4 Mobile-Link, or Cobra4 USB-Link. Technical data: pH measuring range: 0…14 pH Resolution: 0.01 pH Measuring accuracy: ± 0.5% Max. data throughput rate: 5 Hz Dimensions: approx. 62 mm x 63 mm x 35 mm
This temperature sensor with a stainless-steel sheath can be directly connected to the Cobra4 Wireless-Link, Cobra4 Mobile-Link, or Cobra4 USB-Link. Technical data: Temperature measuring range: -20…110°C Resolution: 0.05°C Accuracy: ± 0.5°C Max. data throughput rate: 200 Hz Dimensions: l = 200 mm, = 6 mm, cable length = 120 cm Connector: 15-pin Sub-D
pH electrodes with BNC connectors All the pH and redox electrodes with a BNC connector can be connected to the Cobra4 Sensor-Units “Chemistry” (12630.00) and “pH, BNC connector” (12640.00). For the measurement value display, the user can choose between the units pH and mV. The sensors can be calibrated by a one-point or two-point calibration. 46265.15 pH electrode, plastic, gel-filled, BNC 46266.15 pH electrode, plastic, refillable, BNC 46268.10 pH electrode, glass, refillable, BNC 46267.10 Platinum redox electrode, plastic, gel-filled, BNC
Cobra4 Sensor-Unit “Conductivity+, conductivity/temperature (Pt1000)”
12632.00
The Cobra4 Sensor-Unit “Conductivity/temperature (Pt1000)” is a microcontroller-controlled sensor with a 5-pin diode socket for connecting conductivity sensors with a cell constant of k = 1.00 cm–1 or Pt1000 temperature sensors. The Sensor-Unit can be directly connected to the Cobra4 Wireless-Link, Cobra4 Mobile-Link, or Cobra4 USB-Link. Technical data: Temperature Temperature measuring range: –20°C to +150°C Resolution: 0,1 K Measuring accuracy: ±0.5K (in the range of 0…100°C) Conductivity Measuring range 1: 0 to approx. 2,500 μS/cm Measuring accuracy: 4% of the measured value ±0.15 μS/cm Measuring range 2: 0.0 to approx. 45,000 μS/cm Measuring accuracy: 4% of the measured value ±3 μS/cm Measuring range 3: 0.0 to approx. 1,100 mS/cm Measuring accuracy: 4% of the measured value ±0.05 mS/cm Measuring cycle: 0.8…2s (will be set automatically) Dimensions: approx. 62 mm x 63 mm x 35 mm
Conductivity/temperature sensor Pt1000
13701.01
This conductivity sensor is suitable for the Sensor-Unit “Conductivity” (12632.00) and has an integrated Pt1000 temperature sensor and a 5-pin diode connector. Technical data: Cell constant: k = 1.0/cm (comes with a test certificate with the exact value) External diameter: 12 mm, Min. immersion depth: 10 mm
Temperature immersion probe Pt1000
12123.00
This Pt1000 temperature sensor is suitable for the Sensor-Unit “Conductivity” (12632.00) and has a stainless-steel sheath and a 5-pin diode connector. Technical data: Measuring range: -20…+850°C Diameter: 3.2 to 4.0 mm Cable length: 1.5 m
Cobra4 Sensor-Unit “Conductivity, with a stainless-steel sensor”
12633.00
The Cobra4 Sensor-Unit “Conductivity” has a cable-bound conductivity measuring cell with two robust stainless-steel pins in a plastic sheath and an integrated temperature sensor for the temperature compensation of the conductivity values. This sensor unit is particularly suitable for field experiments. It can be directly connected to the Cobra4 Wireless-Link, Cobra4 Mobile-Link, or Cobra4 USB-Link. Technical data: Temperature: Conductivity Measuring range: –200°C to +1200°C 0,2...2.000 µS/cm 10...20.000 µS/cm 100...200 mS/cm Resolution: 0,1 K 0,1 µS/cm / 1 µS/cm / 10 µS/cm Measuring accuracy: ±0,8 K 6% of the measured value ±0.2 μS/cm Max. data throughput rate: 1 Hz Cable length: 60 cm Dimensions: ca. 62 mm x 63 mm x 35 mm
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Cobra4
Cobra4 Sensor-Units
wireless
Cobra4 Sensor-Unit “Timer/Counter”
12651.00
The Cobra4 Sensor-Unit “Timer/Counter” is used for the time measurement of switching signals and signal levels of up to four fork-type light barriers or measuring microphone, motion sensor, falling sphere apparatus, or other devices with TTL-compatible signals. Device for external triggering can be also connected. This enables experiments concerning linear motion, including collision experiments with demonstration track, free fall experiments with picket fences or a falling sphere apparatus as well as the measurement of oscillations, rotational motion, and frequency measurements in acoustics. Connection to Cobra4 Wireless-Link, Cobra4 Mobile-Link, or Cobra4 USB-Link possible. Technical data: Power supply: via basic unit; in case of three or more light barriers, delivered use external power supply unit. Current consumption: < 300 mA Resolution: 1 microsecond Dimensions: approx. 62 mm x 110 mm x 35 mm Accessories for the Cobra4 Sensor-Unit Timer/Counter: 11207.20 Fork-type light barrier, compact (up to 4) 12651.01 Cobra4 adapter for Sensor-Unit “Timer/Counter” for connection of light barriers 03543.00 Measuring microphone with an amplifier 02502.88 Falling sphere apparatus 12004.10 Motion sensor with cable
Cobra4 Sensor-Unit “Electrophysiology: ECG, EMG, EOG”
The Cobra4 Sensor-Unit “Electrophysiology” is used for the electrophysiological measurements of the heart, eye, and muscle activity. The measuring electrodes are connected to 3.5-mm-sockets with colour assignment via three separate and shielded measurement leads. The unit can be connected to the Cobra4 Wireless-Link and to the Cobra4 USB-Link. Technical data: Signal filter: ECG filter: 0.03 Hz…100 Hz EMG filter: 80 Hz…5000 Hz EOG filter: 0.03 Hz…50 Hz Max. data throughput rate: 1 kHz Dimensions: approx. 62 mm x 110 mm x 35 mm Accessories for the Cobra4 Sensor-Unit “Electrophysiology”: 12673.01 Individual measurement leads, shielded, 3 pieces with colour coding (red, yellow, and green), with 3.5-mm TRS connectors for the connection to the Sensor-Unit and 2-mm-connectors for the connection to permanent and disposable electrodes 12673.02 Alligator clips for disposable electrodes, 3 pieces
Cobra4 Sensor-Unit “Weather: air pressure, humidity, temperature, light intensity, and altitude” Cobra4 Sensor-Unit “Force 4 N”, Cobra4 Sensor-Unit “Force 40 N”
12673.00
12670.00
The Cobra4 Sensor-Units “Force ± 4N and ± 40N” comprise a strain gauge that converts the mechanical load into an electrical signal. A weight holder plate can be fastened to the upper end of the housing in order to measure the weights that are put on the plate. The lower end of the device is equipped with a hook to attach the weights. The Cobra4 Sensor-Units “Force” are held at the top or at the bottom in a mechanically safe manner by a threaded rod with an M6 thread. The unit can be connected to the Cobra4 Wireless-Link, Cobra4 Mobile-Link, or Cobra4 USB-Link. Technical data: 12642.00 12643.00 Measuring range: -4 to +4 N -40 to +40 N Measuring accuracy: 0.2 mN 2 mN Max. data throughput rate: 16 Hz 16 Hz Dimensions: approx. 62 mm x 110 mm x 35 mm approx. 62 mm x 70 mm x 35 mm
The Cobra4 Sensor-Unit “Weather” can measure the following quantities simultaneously: air pressure, relative humidity, air temperature, light intensity, and altitude (based on the air pressure). The unit can be connected to the Cobra4 Wireless-Link, Cobra4 Mobile-Link, or Cobra4 USB-Link. Technical data: Air pressure Temperature Measuring range: 10 to 1100 hPa -40 to +125°C Accuracy: ± 1.5 hPa ± 0.5°C Relative humidity Light intensity Measuring range: 0 to 100% 0 to 10,000 lx Accuracy: ± 5% ± 5% Wavelength accuracy: 320…1050 nm Max. data throughput rate: 5 Hz Dimensions: approx. 62 mm x 70 mm x 35 mm
12642.00 12643.00
Cobra4 Display-Connect
Cobra4 Sensor-Unit “Force ±4 N” Cobra4 Sensor-Unit “Force ±40 N”
Cobra4 Sensor-Unit “Electricity”, current/voltage, ± 6A, ± 30V
12644.00
Fuse-protected current and voltage sensor with 4-mm-sockets. The voltage and current inputs are galvanically isolated. The unit can be connected to the Cobra4 Wireless-Link, Cobra4 Mobile-Link, or Cobra4 USB-Link. Technical data: Current Voltage Measuring range: -6 to +6 A -30 to +30 V Resolution: 3 mA 15 mV Internal resistances: 1 MΩ 33 mΩ Max. data throughput rate: 140 kHz 140 kHz Dimensions: approx. 62 mm x 110 mm x 35 mm
Cobra4 Sensor-Unit Sensor-Unit “3D-Acceleration” “Acceleration, 3D acceleration, Cobra4 ± 2 g, ± 6 g ± 2 g, ± 6 g”
12650.00 12650.00
The Cobra4 Sensor-Unit “Acceleration” has internal acceleration sensors for the three directions in space (x, y, and z). The unit can be connected to the Cobra4 Wireless-Link, Cobra4 Mobile-Link, or Cobra4 USB-Link. Technical data: Measuring range 1 Measuring range 2 Measuring range: -2 g to +2 g -6 g to +6 g Resolution: 1 mg 5 mg Max. data throughput rate: 142 Hz 142 Hz Dimensions: approx. 62 mm x 63 mm x 35 mm
Cobra4 Sensor-Unit “Tesla”
12652.00
The Cobra4 Sensor-Unit “Tesla” is used to measure the magnetic field strength in DC and AC fields. The Hall probes for axial (13610.01) and tangential (13610.02) measurements are connected to the unit via a 5-pin diode connector. The unit can be used in combination with the Cobra4 Wireless-Link, Cobra4 Mobile-Link, or Cobra4 USB-Link. Technical data: Measuring ranges (resolution): ± 10 mT (10 μT) / ± 100 mT (100 μT ) / ± 1 T (1 mT) Compensation: ± 1 T in all of the measuring ranges Measuring accuracy: DC field: ± 2% / AC field: ± 5% AC field measurement: effective value (crest factor up to 5) / max. frequency: 1 kHz Max. data throughput rate: 5 Hz Dimensions: approx. 62 mm x 63 mm x 35 mm
Hall probes for the Cobra4 Sensor-Unit “Tesla” Axial Hall probe: Tangential Hall probe: 13610.01 13610.02
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Hall probe on a tube probe with a handle; probe length/diameter: 300 mm/6 mm particularly flat Hall probe with a handle; dimensions of the probe carrier: (1.1 x 5.0 x 70) mm Hall probe, axial Hall probe, tangential
The Cobra4 Display-Connect set is a combination of a transmitter and receiver for the radio-based communication between a Cobra4 Mobile-Link (12620.55) and up to two digital large-scale displays (07157.93) with 5 selectable transmission channels and a carrier frequency of 433 MHz. With this set, the measurement data can be displayed in a clearly visible manner, even in large auditoriums, classrooms, or lecture halls. All you have to do is connect the transmission unit between a Cobra4 Sensor-Unit and the Cobra4 Mobile-Link and attach the reception unit of the Display-Connect to the input of the large-scale display. The transmitter and receiver are supplied with power via the devices to which they are connected. The measurement series can be recorded in parallel via the SD card of the Mobile-Link. Technical data: Receiver: Transmitter Connector: 9-pin Sub-D connector 15-pin Sub-D connector Channel switching: via a slide switch via the Mobile-Link software Power supply: via the Mobile-Link via the large-scale display Dimensions: approx. 43 x 21 x 112 mm approx. 69 x 57 x 72 mm Transmitting power: 10 mW Range: approx. 30...40 m without obstacles 12623.88 Cobra4 Display-Connect, set comprising a transmitter and a receiver for using the Cobra4 Mobile-Link with digital large-scale displays 12623.01 Cobra4 Display-Connect RX, receiver (for the digital large-scale display) 12623.00 Cobra4 Display-Connect TX, transmitter (for the Cobra4 Mobile-Link) 07157.93 Digital large-scale display, RS232 interface
SD memory card for the Cobra4 Mobile-Link, 2 GB, 20 MB/sec
12620.01
Commercially-available, fast SD memory card incl. transport case. Technical data: Type: SecureDigitalCard; manufacturer: SanDisk, Extreme III Storage capacity: 2048 MB Write/read speed: 20 MB/sec
Card reader for SD cards
12620.03
USB 2.0 single-slot card reader for SD and MMC cards up to 2 GB. Can be used without a driver under Windows ME, 2000, XP, Vista, and Mac OS 9.1, OS X. Reads and writes SecureDigital and MultiMedia cards. Technical data: Data transfer rate: up to 18.5 MB/s with SD cards (11 MB/s with MM cards)
Rechargeable metal hydride batteries and a charger for Cobra4 All of the Cobra3 units that require a power supply use rechargeable metal hydride batteries with low selfdischarge (type Mignon (AA), voltage 1.2 V, capacity 2000 mAh). They can be recharged quickly with the matching quick charger (for 4 rechargeable Mignon (AA) or Micro (AAA) batteries, adjustable charging current of 2100 mA or 850 mA, trickle charging). 07930.03 Rechargeable metal hydride battery, type Mignon (AA), 1.2 V, 2000 mAh, type Eneloop, pack of 4 07930.99 Quick charger for rechargeable metal hydride batteries, 100...240 V
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Cobra4 wireless
PHYWE equipment sets
■ The
Basic set physics Ref. no. 12605.89 Optimally suitable for demonstration experiments concerning mechanics, electricity, and thermodynamics ■ Experiments can be performed right in the middle of the classroom since the system is independent from the location of the PC ■ Easy realisation of measurements in reference systems that are in motion (rotation, free fall, parabolic throw, oscillations, etc.) ■ Can be combined with a laptop and used in the field or schoolyard (accelerations during jumping, driving, etc.) ■ Sturdy case with foam padding ■
Experimentation case “Environment and field experiments” Ref. no. 12622.77 Contains all of the components for four workgroups to perform environmental field experiments without any other preparation ■ Didactic background: the students discover various ecological aspects of their local environment ■ Literature with detailed experiment descriptions concerning ecological standard topics with the main focus on field experiments ■ 4 Mobile-Links and 4 sensors: temperature, pH, conductivity, weather: air pressure, humidity, light intensity, temperature and altitude (8 parameters can be measured) ■ Includes the data processing software measure and an experiment manual ■ High-quality aluminium case with foam padding ■
The following items are included in the case: Calibration solutions and tablets, measuring vessels, a pH electrode with a protective sheath, SD memory cards, data transfer cables, storage batteries and backup storage batteries, and a fast charger. The experimentation case “Environment and field experiments” is also available with one instead of four Mobile-Links. The rest of the scope of supply is identical.
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The following items are included in the case: 1 Cobra4 Wireless Manager and 1 Cobra4 Wireless-Link for wireless data transfer, the sensors “Temperature”, “Current/voltage”, “3D acceleration”, and “Force ± 4 N”, and the software measure for recording and evaluating the measurement data.
PC can be set up far away from the experiment so that it is protected against aggressive solutions ■ The set can also be used outdoors for field experiments (e.g. for ecological measurements) in combination with a laptop ■ The set comes supplied in a robust case with a foam inlay The following items are included in the case: 1 Cobra4 Wireless Manager and 1 Cobra4 Wireless-Link for wireless data transfer, the sensors “Chemistry” and “Conductivity”, a pH electrode, a conductivity-temperature probe, a temperature immersion probe NiCr-Ni (Teflon), 2 protective sheaths for the electrodes, and the software measure for recording and evaluating the measurement data.
Cobra4 extension for TESS Ref. no. 12604.88 Cobra4 Wireless extension set for TESS in a wooden box. Optimally suitable for computer-assisted student experiments with PHYWE experiment sets TESS mechanics, electricity building block system, and heat. More than 20 student experiments can be performed easily and comfortably.
Basic set chemistry Ref. no. 12606.89 Optimally suitable for demonstration experiments in chemistry ■ Measurement of important parameters, such as pH, conductivity, and temperature ■
The wooden box contains: Cobra4 Wireless Manager, Cobra4 WirelessLink, Sensors: 1 x Temperature-Semiconductor -20..110°C, 1 Sensor Electricity and Force 4 N, as well as accessories. The TESS set is also available in a plastic case (12604.77).
Class set Mobile-Link 8x Ref. no. 12621.88 Perfectly suitable as a digital multimeter set for various parameters ■ For student experiments without a PC, field experiments, project days, etc. ■
The case includes: 8 Mobile-Links, 8 SD memory cards, additional backup storage batteries (AA), Mignon, 1.2 V, 2700 mAh, fast charger for the storage batteries, and the measure software for transferring the data to the PC as well as for analysing them. Other sets are available upon request!
Basic set Cobra4 Display-Connect Ref. no. 12607.89 ■
Uncomplicated transfer of the measurement values of the Cobra4 Mobile-Link to a largescale display
Parallel transfer of values to several large-scale displays ■ Easy to use: plug & play ■ Didactic design, since the unit of the measurement value is also displayed ■ 56 mm high LED display that is clearly visible even from a distance ■
The aluminium case includes: Cobra4 Display-Connect, Cobra4 Mobile-Link, digital large-scale display, 1 Cobra4 Sensor-Unit “Weather”, fast charger, and the Cobra 4 manual.
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Cobra4
Cobra4 - System Overview
wireless
How would you like to measure? Basic units 1. Wireless
2. USB
3. Mobile
Wireless link, optimal for: – Demonstration experiments and student experiments – Experiments with moving objects (e.g. rotation, linear movement, acceleration, etc.) – Higher comfort concerning the experiment set-up (no cables, and compact set-ups can be transported as a whole)
Cobra4 Wireless Manager (per Unit 1 PC required) Cobra4 Wireless-Link (per Cobra4 Sensor-Unit 1 Wireless-Link required) Cobra4 Remote-Link (To Start/Stop of measurement on radio, optional) or USB cable connected to a PC, optimal for: – Demonstration experiments and student experiments – Particularly quick measurements (acoustics, electricity, etc.) – Connecting several sensors via a USB hub Cobra4 - USB-Link or Hand-held measuring instrument used as a data logger, optimal for: – Field experiments with groups of students, e.g. project days, excursions, etc. – Student experiments without PC – Demonstration experiments without PC (with display connect and digital large-scale display) Cobra4 Mobile-Link, incl. SD memory card Cobra4 Display-Connect, set including a transmitter and a receiver
Ref. no. 12600.00 12601.00 12602.00
12610.00
12620.55 12623.88
What would you like to measure?* Sensors Temperature pH Conductivity Force Current/voltage Acceleration Weather ECG, EMG, EOG Pressure and temperature Magnetic field
Cobra4 Sensor-Unit “Temperature, semiconductor -20…110°C” Cobra 4 Sensor-Unit “2 x temperature NiCr-Ni”1) Cobra4 Sensor-Unit “Chemistry: pH and 2 x temperature NiCr-Ni”1) Cobra4 Sensor-Unit “pH, BNC connector”1) Cobra4 Sensor-Unit “Conductivity (Pt 1000)”1) Cobra4 Sensor-Unit “Conductivity with a stainless-steel sensor” Cobra4 Sensor-Unit “Force ± 4 N” Cobra4 Sensor-Unit “Force ± 40 N” Cobra4 Sensor-Unit “Electricity, ± 30 V, ± 6 A” Cobra4 Sensor-Unit “Acceleration, ± 2 g, ± 6 g” Cobra4 Sensor-Unit “Weather: air pressure, humidity, temperature, light intensity, altitude” Cobra4 Sensor-Unit “Electrophysiology: ECG, EMG, EOG” Cobra4 Sensor-Unit “Thermodynamics: 2x temperature, pressure” 1) Cobra4 Sensor-Unit “Tesla” 1)
Excellent products, consulting, and service PHYWE provides assistance and brings people together
12640.00 12641.00 12630.00 12631.00 12632.00 12633.00 12642.00 12643.00 12644.00 12650.00 12670.00 12673.00 12638.00 12652.00
Education in the natural sciences begins in the auditorium or classroom, but our service starts long before all that. Our extensive and perfected customer care programme is based on the three columns Campus, Pre-Sales, and After-Sales. Campus is a training and education programme that provides our end users, sales partners, and employees with the opportunity to always be up-to-date in terms of the scientific and technical developments at PHYWE. Whether it is online, at the customer’s site, or in-house at PHYWE in Göttingen: our Campus is always there for you. The Pre-Sales area includes – among other things – the scientific contributions of PHYWE at specialised conferences, product and system
demonstrations, and seminars, but also consulting and support in the definition of projects and the selection of the optimal solutions and systems for your specific needs. We ensure that you make the right decisions, and that you receive and use the best cost-performance ratio. Please do not hesitate to ask us! With our After-Sales programme, we ensure that you can use your PHYWE product efficiently for a long time. This is indeed reliable protection for your investment. We are there for you if you have queries concerning the respective installation or utilisation, but also for the supply of spare parts or in the event of warranty claims and repairs. Our technical hotline helps and supports you.
Measuring and evaluation software Software “measure”, single-user and school licence (FREE updates, supports ALL of the Cobra4 Sensor-Units)
14550.61
Handbook Cobra4: physics, chemistry, biology, and everyday-life phenomena Handbook for the student experiments “Cobra4 environment and field experiments”
01330.02 12622.02
Customer Services
Literature
Cases/equipment sets Cobra4 Mobile-Link, experimentation case “Environment and field experiments” for 4 workgroups Cobra4 Mobile-Link, experimentation case “Environment and field experiments” for 1 workgroup or as a teacher demonstration set Basic set physics Cobra4 wireless Basic set chemistry Cobra4 wireless Cobra4 Wireless, extension set “TESS mechanics, electricity building block system, and heat”, in a wooden box Cobra4 Wireless, extension set “TESS mechanics, electricity building block system, and heat”, in a plastic case Cobra4 Mobile, class set with 8 devices, in a plastic case Cobra4 Display-Connect, basic set with a digital large-scale display, Mobile-Link, and weather sensor in an aluminium case with a manual Other cases and equipment sets are available upon request
12622.77 12619.77 12605.89 12606.89 12604.88 12604.77 12621.88 12607.89
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Campus
Pre-Sales
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Support
Technical Support
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Repair
* The Cobra4 system is continuously being extended by other measuring quantities. Sensors for movement (timer-counter, distance), CO2, and pulse will soon be added to the product range. 1) Suitable sensing elements for this sensor can be found on pages 16 to 19.
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Cobra4 wireless
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