Rotary Displacement Meter DKZ 02
PRODUCT INFORMATION
Serving the Gas Industry Worldwide
ROTARY DISPLACEMENT METER DKZ 02 Application, method of operation, testing, maintenance
2
Application
Testing / Gas meter calibration
• DKZ 02 rotary displacement meter for volumetric gas measurement in gas distribution stations and in domestic, administrative and industrial buildings. • Suitable for use with all non-corrosive gaseous media, such as natural gas, propane, butane, nitrogen, air, etc. • For vertical or horizontal installation in both flow directions. • No inlet or outlet pipes are required for operation. • Can also be used in the case of intermittent gas withdrawal.
The rotary displacement meters correspond to DVGW, PTB and EC regulations and other international and national regulations of various countries. In our staterecognized testing laboratory for gas measuring devices, each rotary displacement meter is tested in operational condition and checked for compliance with the error range. It is then provided with an official seal which identifies it as being approved for custody transfer metering.
Method of operation
The quality details resulting from the strength and leak tests are documented in accordance with national and international standards.
The rotary displacement meter is a gas meter which measures the volume of gas and operates on the displacement principle. It records the gas volume at actual line conditions (i.e. volume at measurement conditions) which has flowed through the gas meter. A downstream volume corrector can be used to convert this volume into the volume at base conditions. The rotary displacement meter consists of the actual measuring element and a totalizer to display the volume at measurement conditions. When the gas decreases, there is a pressure drop between the meter inlet and outlet which produces a torque at the two rotary pistons. As soon as this torque exceeds the holding torque of the rotary pistons, the pistons start to rotate. The rotation of the pistons is forcecontrolled by precision gears located outside of the measuring chamber. In the further course of the rotation of the pistons, the two sections of the measuring chamber of the rotary displacement meter are periodically filled and evacuated. There is a non-contact seal between the two measuring chamber sections which is achieved by minimum gaps between the rotary pistons themselves and between the rotary pistons and the casing. The rotational movement of the pistons is transferred through a magnetic coupling to the pressureless compartment of the totalizer where the rotations are added and then displayed on a digital index as volume (m3). The totalizer is installed rotatably and can be adjusted to the relevant position for installation and direction of flow of the gas meter. Two LF pulsers are fitted in the totalizer. They generate an electric volume pulse which is further processed by appropriate supplementary equipment. The rotary displacement meter starts to operate at a pressure drop of less than 0.1 mbar and a flow rate of less than < 1/1000 Qmax.
Installation and maintenance The rotary displacement meter is to be installed in the pipeline with minimum stress using appropriate seals and screws according to standards. No base is required for the gas meter. During installation, the rotary displacement meter is to be aligned using a spirit level, so that the piston axes are in a horizontal position. For troublefree operation of the gas meter, only filter-purified gases with a solids grain size of less than 50 μm are permissible. It is recommended that a filter or at least a start-up screen be installed. The gas meter is supplied without oil. As soon as the unpressurized gas meter has been installed in the pipeline, the cover compartment is to be filled with oil. This has to be done gradually in order to avoid filling beyond the sight-glass area. When commissioning the gas meter, pressure shocks are to be avoided. The process should be performed slowly. Maintenance of the gas meter is limited to an oil-level check which is to be performed approximately once a year. For this purpose, the rotary pistons must be at rest. If the oil level falls below the centre mark of the sight glass, oil has to be topped up. We would recommend using the oil types Shell Tellus oil 10 or BP Energol HLP 10 or a comparable oil with a kinematic viscosity of 10 mm2/s at 40°C. The totalizer is completely maintenance-free. The gas meter can also be used in outdoor installations if an appropriate protection against the weather is provided. For special information about installation and maintenance, see the Operating and Maintenance Instructions.
ROTARY DISPLACEMENT METER DKZ 02 Capacity data CAPACITY DATA DN
Qmax
V
Qmin m3/h
Qmin
Pulse
(inch)
m³/h
dm³
MID
m³/h
LF P/ m3
16
50 (2“)
25
0.66
0,6
1.25
25
50 (2“)
40
0.66
0,6
2
0.8
40
50 (2“)
65
0.66
0,6
3.25
1.3
1
0.8
0.6
65
50 (2“)
100
0.66
0,6
5
2
1.5
1.25
1
0.6
100
80 (3“)
160
1.07
0,8
8
3.2
2.5
2
1.6
1
160
80 (3“)
250
2.67
1,6
12.5
5
4
3
2.5
1.6
1
160
100 (4“)
250
2.67
1,6
12.5
5
4
3
2.5
1.6
1
250
100 (4“)
400
2.67
2,5
20
8
6
5
4
2.5
1
G-Size
1:20
1:50
1:65
1:80
1:100
1:160
1:200 10
0.6
10 10 10 0.8
1
Error of measurement %
Qmin according to MID is the lowest permissible value. For the listed measuring ranges the meters are not always calibrated down to this value. This reduces the price of the device.
+2 +1 0 -1 G
Qmax
-2 Qmin
Qt
Flow rate m3/h
Average error curve (Qt - as a function of the measuring range)
PRESSURE LOSS
Pressure loss mbar
5 4 Air
3 2
Natural gas
1 0
Air
Natural gas
(ρ=1.2 kg/m³)
(ρ=0.83 kg/m³)
G16
0.6
0.4
G25
1.0
0.7
G40
1.5
1.0
G65
2.4
1.6
G 100
3.2
2.2
G 160
4.5
3.0
G 250
8.4
5.5
Size
Qmin
G Flow rate m3/h
Average pressure loss curve
Qmax
(Average pressure loss in mbar at Qmin)
3
ROTARY DISPLACEMENT METER DKZ 02 Dimensions and weights, taps DIMENSIONS AND WEIGHTS G-Size
DN (inch)
A
B
C
D
50 (2“)
331
240
90
180
402
276
126
471
311
160
471
311
160
E
Flanges with threaded holes
Weight
mm
kg
DIN EN 1092-1
ANSI B 16.5
171
11.8
4 x M 16
4 x 5/8“-UNC
180
171
15.2
250
241
39.4
8 x M 16
4 x 5/8“-UNC
250
241
39.4
8 x M 16
8 x 5/8“-UNC
16 25 40 65 100
4
160 160 250
80 (3“) 100 (4“)
3
4
1
1
4
2 3 1
E
2
1
5
2 1
6
B
1
5
C
D
A
1 - Oil filler/drain hole 2 - Oil-level gauge 3 - Temperature transmitter tap
4 - Pressure transmitter tap 5 - Reference pressure measurement tap 6 - Tab hole for holding plate for mounting of volume corrector EC 900
Temperature taps
Pressure taps
The temperature taps are required for installing thermowells for resistance thermometers. They are located on the inlet flange of the gas meter. Note: Standard – without thermowells; threaded holes sealed with screw plugs.
Pressure taps are required to determine the pressure at measurement conditions when a volume corrector is connected or for differential pressure measurement via the gas meter. The gas meter has one pressure tap on each of the inlet and outlet flanges.
ROTARY DISPLACEMENT METER DKZ 02 Technical data DKZ 02 Material
Aluminium
Size
G 16 - G 250
Pressure rating
PN 16, ANSI 150
Installation position / Direction of flow
Horizontal or vertical / universal
Installation
No inlet or outlet section required
Operating temperature range MID
-25°C to +55°C
Operating temperature range PED
-40°C to +60°C
Operating pressure
pmax = 10 bar
Design
Adapted to DIN EN 12480
Approvals
- MID approval acc. to EN 12480 - OIML R 137-1
Degree of protection
IP 67
Materials Casing Pistons Gears
Aluminium alloy Aluminium alloy Steel, hardened and ground
Type of connection
Flanges with threaded holes
Connecting dimensions
DIN EN 1092-1 ANSI B 16.5 RF
Variants of flanged ends
PN 16 – DIN 2501 ANSI150 – ANSI B 16.5 RF
Measuring ranges
1: 50 (standard) up to 1 : 160 (option)
5
< 2% at Qmin
Accuracy
< 1% at Qmax (factory-provided: 0.5%)
Repeatability
< ±0.1%
Pressure loss
See table on page 3
Overloading
For a short time up to 1.25 Qmax
Rate of pressure variations
< 0.5 bar/s
Measuring taps
Pressure and temperature taps are located in the inlet and outlet of the meter casing
Pulse transmitters
2x LF (reed)
Oil-level gauge
On the front - Meter head type “G” - 8-digit index in m3 - 1x tamper contact (standard) - 1x encoder, type ENCO 08 (option) - 1 mechanical drive shaft (option) - Can be universally adapted to the direction of flow; a representative of the weights and measures office need not be present on this occasion
Mechanical totalizer
TEMPERATURE TAPS
PRESSURE TAPS
2x (inlet)
1 x inlet / 1 x outlet
All diameters
Al / PN16 ANSI 150
Installation variant
Thread
Seal of threaded hole
Thermowell
1/4“ NPT
Screw fitting with sealing cone for pipes with dia. Ø6
ROTARY DISPLACEMENT METER DKZ 02 Flow variants, pulse transmitters
Flow variants
0 1 3 6 3 4 9,2
6
0 1 3 6 3 4 9,2
0 1 3 6 3 4 9,2
The position for installation can subsequently be changed by simply turning the totalizer without breaking a seal. For information about changing the direction of flow, see the Operating Instructions.
Pulse transmitters The totalizer is fitted with two pulse transmitters. Signals are picked up through a lateral plug. Types 2xLF
1x
Variants - reed switch, polarity-independent - operating voltage U = 3-16 V DC - switching current, max. I = 40 mA tamper contact
- with encoder ENCO 08 - mechanical drive shaft (EN 12261)
ROTARY DISPLACEMENT METER DKZ 02 Ordering information
Ordering information (example)
ORDERING INFORMATION
EXAMPLE
Casing material
Al
G-Size
G 16, G 25, G 40, G 65, G 100, G 160, G 250
Nominal diameter
DN 50 (2“) DN 80 (3“) DN 100 (4“)
DN 50
Pressure rating/ Flanged ends
PN16, ANSI150
PN 16
Measuring range
1:20, 1:50, 1:65, 1:80, 1:100, 1:160
1:65
Encoder
yes (Enco 08) no
yes
Thermowells
none 1 x Inlet 2 x Inlet
2 x Inlet
Cover of Meter Index
Plastic Aluminium Aluminium with mechanical drive shaft Aluminium with venting
plastic
Start up screen (mesh size 0.4 mm)
None DN 50 (2“) DN 80 (3“) DN 100 (4“)
ID Plate Language
English German French
Al G 65
none
English
7
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DKZ 02 2012-08 © 2012 Honeywell International Inc.