dkz02_leaflet_en_01

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.