Electronic Meter Controller for Aircraft Refuelling Vehicles The Avery-Hardoll MASTERLOAD II™ is a versatile micro processor based electronic controller. It is an intrinsically safe system that is ideal for use in Category 2 hazardous areas and is comprised of a pulse transmitter mounted on the meter, a display unit giving readouts of batch volume, flow rate and a totaliser.
Features • Accurate, dynamic meter calibration • Volume to weight conversion. • Temperature compensation (option) • Two-way data interchange to cab mounted data capture systems • Interface to deadman system • Interface to accessories with 4-20 mA output • Flexible installation
General Information The MASTERLOAD II™ is a microprocessor-based electronic meter controller. The system consists of a pulse transmitter (mounted on the meter), a display unit, and a power supply unit. A platinum resistance thermometer (PRT), printers, and any additional displays are optional and available. All MASTERLOAD II components are intrinsically safe and ideal for use in Category 2 hazardous areas. Displays of batch delivery, rate of flow and totaliser are given on three large liquid crystal displays that provide readouts of batch volume, flow rate and the totaliser. These displays can be easily configured to show alternative values such as temperature compensated volume and volume to weight conversions. Additional displays can show repeat or supplementary information at other convenient locations on the refuelling vehicle.
Dynamic Calibration at all flow rates MASTERLOAD II™ provides accurate error correction across the entire flow range. Conventional meters are calibrated at only one flow rate - generally at 100% flow, despite the reality that meters operate at a variety of flow rates. MASTERLOAD II calibration is corrected at all flow rates to provide the highest level of accuracy. With a choice of 1, 2, 4 or 8 calibration points across the full flow range - the system allows the user the flexibility to configure each MASTERLOAD II to suit the requirements of their own application. It performs a flow curve fitting exercise to provide the required correction.
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MASTERLOAD II™
MASTERLOAD II™
MASTERLOAD II™
MASTERLOAD II™ Additional Features TEMPERATURE COMPENSATION An add-on option that provides a temperature display. Using a platinum resistance thermometer (PRT), the display may be configured to show product temperature or mean batch temperature. Alternatively, full temperature correction to standard temperature or to the IP/ASTM tables 53 and 54 may be configured. VOLUME TO WEIGHT CONVERSION Provides a reading in weight. Available as either a simple manually entered density figure for low cost batch conversion or a dynamic input from an in-line densitometer which when linked to temperature correction offers the highest level of accuracy. DATA COMMUNICATION to RS422 SPECIFICATION Offers comprehensive two way data communication between the meters and a variety of vehicle systems allowing data flow from the meter to the system and user input passed back to the meter. Approved to EN ISO 6551-1995 level A, Masterload offers the highest level of data security available. AUTOMATIC CALIBRATION When calibrated against a masterload reference meter. A simple infra-red connection links any Masterload meter to a Masterload reference meter. This allows calibration to be carried out completely automatically thus reducing down time, volume of product passed and the potential for human error. Calibration certificates are computer generated to the IP or customer’s own specification. DEADMAN INTERFACE The power supply unit provides a permanent signal to the deadman circuit. If an error occurs, the signal is removed and the deadman shuts the fuelling off.
System Schematic
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MASTERLOAD II™
MASTERLOAD II™
Pulse Transmitters
Display Options
PULSE TRANSMITTERS MASTERLOAD II™ Liquid Controls POD
Preset display unit.
Electronic Pulse Output Device
MASTERLOAD II™ Preset display unit fitted with temperature compensation.
Avery Hardoll Pulsers MASTERLOAD II™ Preset display unit fitted with temperature compensation and AutoCal link.
Dimensions DISPLAY UNIT
POWER SUPPLY UNIT
241
255
222
253
80
112
265
80
45
80
222
Consult the factory when certified engineering drawings are required. Dimensions shown are not suitable for construction or modifications
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MASTERLOAD II™
MASTERLOAD II™ Specifications Sealing: All units are designed for outdoor use and are sealed to specification IP 65 Security: Full wire sealing Automatic error checking Alarm reporting Data Storage for 40 transactions
Locations: Flexible mounting: (max 50 meters between units)
Operating Temperature -20 to 40° C Transmitter: Temperature: -30 to 120° C Fitting: Direct drive available for most makes of meter Approval: EN ISO 6551-1995 Level A Channels: 3 Independent Security: Sense line Humidity: Resistant up to 100% R.H. Temperature Probe PRT Accuracy: +/-0.1° C Discrimination: 0.1° C Range: -30 to 120° C Set Up: Factory set Alarm Limits: Programmable Display: °F or °C Compensation: 15, 20 or 31.5° C Safety Classification: Category 2
ATEX Approvals: Power Supply Unit: (flameproof) - II 2 G EEx d IIB T6 - Cert. No. ITS04ATEX11903 Display Unit: - II 2 G EEx ib IIB T4 - Cert. No. BAS02ATEX2199
Delivery Override: Key Operated IP 65 Box (option) Non-volatile Memory: Infinite data retention Power Supply: 12/24 VDC Power consumption: 350mA max. (excluding relays) Relays: Max of 11 plug-in Typical - 1 Deadman Pulse output Inputs: 4-20mA (4) Manual Input: Density for weight indication
LCD Display: Linearisation: Batch: Min. volume - one unit 6 figures 1, 2, 4 or 8 selectable standard units Full dynamic interpolation (2 decimal places selectable) Accuracy: +/- .02 @ measuring condition Flowrate: Sampled every .6 secs and 15° C if temperature compensation fitted. Totaliser: 8 figure Remote Displays: Up to 3 remote display units. Product correction tables Interfaces: RS422 IP/ASTM Table Selection to IP65 • 7 switch monitoring contacts Generalised crude (A tables) • Auto calibration port Generalised products ID Mode: Simple password entry Table 54 Table 53
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