Document

Technical Product Information

ROTARY DISPLACEMENT METER DKZ 04

SERVING THE GAS INDUSTRY WORLDWIDE

RMG MESSTECHNIK GMBH


Fields of Application, Operating Principle and Construction

Operating principle

Application

Design and structure

Gas types

The rotary displacement meter is a volumetric meter for

measuring gas in closed pipelines. If there is a pressure

loss in the section from the inlet to the outlet of the

meter, this causes a rotational torque at the rotary

pistons. When this torque exceeds the steady-state

torque of the parts to be actuated, the rotary pistons

start to rotate in the direction of the arrows. In the

course of the rotational movement, the chambers

forming between the rotary pistons and the case are

filled and evacuated so that the rotation of the pistons

represents a measure for the volume that has flowed

through.

A matching gearing is used to translate this rotational

movement to a totalizer which continuously counts the

gas volume in working cubic metres.

RMG's rotary displacement meters have been designed

for measuring gaseous fluids.

They are mainly used

in public gas supply - in gas transfer and measuring

stations - for measuring gas consumption and

distribution in communities and at gas suppliers as

well as gas consumption of final consumers, such as

steel works, brick works and the glass industry, and in

heating systems of schools and hospitals, block

heating systems, etc.

in the chemical industry for measuring gas

consumption and distribution, in some cases with

process gas control.

in the automotive industry for determining the intake

air volumes of combustion engines in engine and

development test stands.

in the industry for measuring the consumption of

compressed air.

in compressor technology in order to determine the

volume of air generated in test stands.

DKZ 04 rotary displacement meters are built for the

PN 10 and PN 16 pressure classes. The pressurized parts

are made of spheroidal graphite iron, while the rotary

pistons are made of anodized light metal. The anodized

coating makes the piston surface considerably more

resistant to wear and tear. Overdimensioned bearings

and hardened and ground gears used for synchronizing

the rotary pistons ensure smooth running. From a rotary

piston shaft, the rotational movement is transferred in a

pressure-tight and contact-free way through a magnetic

coupling from the pressure compartment to the totalizer

drive shaft. The latter carries the magnetic core and

drives the totalizer gears with its finely stepped adjusting

gear ratio inside the unpressurized totalizer case as well

as the double 8-digit roller-type index. Up to the size of

G 400, the meters are built in flanged design; larger

meters have screwed-on feet.

DKZ 04 rotary displacement meters from RMG of course

also meet the requirements of the European standard for

rotary displacement meters EN 12480.

The meters can be used for measuring all non-corrosive

gases in accordance with DVGW Code of Practice G 260

as well as natural gas, town gas, coke-oven gas, refinery

gas, propane, butane, LPG-air mixture, methane,

ethylene, hydrogen and other gases.

In the measuring chamber, there is no metallic contact

and the rotary pistons run very smoothly. Measurements

start below p < 0.1 mbar and at Q 1/1000 Q .

All RMG gas meters fulfill the constructional

requirements of DVGW Code of Practice G 492/II,

DIN 30690 T 1, DIN 3230 T 5 and the Pressure

Equipment Directive (PED) 97/23/EC and are subjected

to the mechanical strength and leak tests specified

therein.

The case materials satisfy the requirements of

EN 13445-2 with PED QM certification and

EN 10204/3.1 inspection certificate.

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Features and Operating Conditions

7.241

01.04

Features

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Pressure classes: PN 10 and PN 16

Nominal diameters: DN 50 to DN 200

High-temperature resistant design as standard

Wide measuring range

PTB-approved

Excellent reproducibility.

Verification period: 16 years

Low on maintenance

Pressure and temperature taps are located on bothsides of the meter case.

Double digital index fitted as standard

No inlet or outlet pipes are required.

Suitable for intermittent operation

No slow-down effect of the meter after the flow hasstopped.

Independent of pressure,

Long-term stability of measurements.

up to an operating pressure of 5 bar for the meter

sizes G 40 to G 400.

up to 1:160 for custody transfer metering.

Oil change every 16 years with clean and dry gases.

enables the direction of flow to be changed on site

without official supervision.

e.g. in heating systems.

i.e. no high-pressure offset.

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Errors of measurement andoperating resistance

Temperature at measurement conditions

High-temperature resistance

Positions of installation

Requirements for higher measuring accuracy and

reliability over a wide measuring range or in the case of

intermittent operation open up a multitude of possible

uses for the volumetrically metering rotary displacement

meter, in particular at industrial gas consumers or in

conjunction with heating systems. The reproducibility of

measured values is excellent and remains stable over

many years with normal operation.

Subsequent verifications of Pintsch rotary displacement

meters which have been in use for as long as 50 years in

most cases have virtually shown no deviations of their

error curve from that of their state when new. Thanks to

a special production method, tightest manufacturing

tolerances are achieved with high precision with this

measuring system operating on the Roots principle. Thus,

measuring ranges of up to 1:160 are possible.

Bearings and gears have been optimized to ensure

smooth running and a low pressure loss p. It varies in

rough approximation proportionally with the density of

the gas and squarely with the meter load. The p values

for the individual meter sizes at Q are shown in the

table on page 6.

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The normal gas temperature range should be from -10°C

to +40°C. Please contact us if you intend to use the

meters with gases at higher or lower temperatures. The

meters can be stored at temperatures from -20°C to

+60°C.

Due to the fact that the gas meters do not involve an

additional risk in the case of a fire, RMG's DKZ 04

rotary displacement meters from sizes G 40 to G 400 are

built in such a way that they fulfill the requirements for

high-temperature resistance in accordance with

EN 12480 and DIN 3374.

RMG's rotary displacement meters have been designed

for both horizontal and vertical directions of flow and the

position of the totalizer can be changed without official

supervision.

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Totalizer and Measuring Accuracy

Sizes G 40 to G 400

Sizes G 650 to G 1000

Added flexibility thanks to adouble digital index

Measuring uncertainty

The location of the oil level indicators and the fastening

feet can be adjusted to a horizontal or vertical position of

installation.

So the gas meters can be turned through 90°, while the

oil level indicators and the fastening feet can be screwed

on and the totalizer case adjusted to the new position

(without official supervision).

The level-check plugs are located in such a way that the

gas meters can be installed horizontally and vertically.

Thus, they can be turned through 90° and only the

totalizer case has to be adjusted to the new position of

use (without official supervision).

RMG's DKZ 04 rotary displacement meters are fitted with

a double digital index which enables the gas meter to be

adapted to the direction of flow without changing the

totalizer and without official supervision on the initial

start-up of the meter. This mainly reduces the stocking of

parts and avoids costs for short-term changes of planned

plants. On-site adjustment to the desired direction of

flow can be made easily and without any tools. The

double digital index has two counter-running indicators

which are covered by a plate on delivery. After the

direction of flow has been determined, the appropriate

indicator is uncovered. If necessary, the meter head can

be turned through 90° by loosening two hexagon socket

head screws.

Further features:

1 LF pulse transmitter fitted as standard.

Additional (HF or LF) pulse transmitters can be

installed.

A mechanical drive shaft in accordance with

DIN 33800 can be retrofitted.

RMG's DKZ 04 rotary displacement meters are

measuring instruments suitable for custody transfer

metering. If desired by the customer, they are officially

verified by us in accordance with applicable German or

EC regulations or tested with the officially approved

measuring equipment in our factory and delivered as

specified.

The measuring system offers the following advantages:

wide measuring ranges with narrow error limits,

excellent reproducibility (approx. 0.1%),

virtually no hysteresis,

high measuring accuracy even in the case of

intermittent flow rates such as those prevailing in

heating systems for example,

no slow-down effect of the gas meter after the flow has

stopped,

high stability of measurements, i.e. virtually no

changes of measurement errors over many years,

excellent high-pressure performance, i.e. the

measuring result is independent of the pressure.

The verification regulations specify the measurement

error limits (of the instantaneous value) shown.

The error values are located on a typical error curve as

shown in the figure below.

In the case of a verification in accordance with EC

regulations (with a measuring range of 1:10 or 1:20),

measurement error limits are ±2% up to 20% of the

maximum flow rate Q and ±1% beyond this flow rate.

In the case of a verification in accordance with German

regulations, the measuring ranges of 1:30, 1:50, 1:100

and 1:160 are also possible. Here, however, the

measurement error limit of 1% starts already at 15%,

10%, 8% or 6% of Q .

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Qmin

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-1

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Qmax

Measuring range

Measure

men

terr

or

in%

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Dimensions and weights


Dimensions and Weights

a

afce

mm mm mm mm ø k D d2 d2 kg

50 G65 16 150 291 161.5 452 80 125 - M 16 4 20 31

mm

50 G40 16 150 261 131.5 392 80 125 - M 16 4 20 30

Nomi- Meter Press. * **e

PN a c e f h ³ ***

Drilling pattern of connecting

Approx.flanges to EN 1092-2

Number weight

nal dia. siz classDN s

mm mm mm mm ø k D d2 d2 kg

80 G100 16 230 294 164 458 80 160 210 M 16 8 20 38

1 2

mm

80 G160 16 230 349 164 513 80 160 210 M 16 8 20 48

100 G160 6 30 349 164 513 80 180 229 M 16 8 20 46

100 G250 16 340 333 189 522 85 180 229 M 16 8 20 75

150 G400 16 340 383 239 622 85 240 285 M 20 8 24 90

Nomi- Meter Press. * **size class

PN a c e f h³ ***

Drilling pattern of connecting


Number weight

nal dia.DN s

a

a

fce

mm mm mm mm mm mm mm mm mm mm ø k D d2 d2 kgmm

150 G65010 400 452 268 862 440 100 270 570 510 440 380 240 285 23 8 26 210

16 630 502 315 902 460 150 440 640 550 640 550 240 318 23 8 37 420

200 G100010 400 522 268 1002 440 100 410 570 510 440 380 295 340 23 8 26 260

16 630 572 315 1042 460 150 580 640 550 640 550 295 381 23 12 41 580

Nomi- Meter Press. * **size class

PN a c e f g h³ m i k i1 k1 ***

Dimensions of the meter foot Drilling pattern of conncting


Number weight

nal dia.DN s

k

a

S

g

i

k1

a

i1f

c

h*)

m

112

ø1

10 40

D

S

Øk

DN

d2

Applicable to all

tables:

* Face-to-face

length according

to EN 12480

** Recommended

distance to the

wall for mainte-

nance work

*** Through-hole

thread / blind-

hole thread

(depth = s)

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Measuring Ranges, Installation and Maintenance

Measuring ranges / pressure loss

Installation and maintenance Mechanical drive shaft

RMG's DKZ 04 rotary displacement meters do not

require any inlet pipes.

The gas and the pipeline have to be clean; it is

recommended that a start-up strainer be installed

temporarily.

The gas meters are splash-lubricated. The oil level can be

checked by means of level-check plugs.

Depending on the operating conditions, oil has to be

changed at intervals between 5 and 16 years.

The totalizer does not require special maintenance within

the period of validity of the verification of 16 years.

For further information, see the operating instructions.

All meter sizes can optionally be operated with a

mechanical drive shaft without any restriction of the

measuring ranges.

For connecting additional equipment, a mechanical drive

shaft is available ex works or can be retrofitted on site

under official supervision. The connecting dimensions for

the equipment to be connected conform to DIN 33800.

The rotation rates and the permissible connecting

torques are shown in the table on page 7. The

mechanical drive shaft can be used, for example, to

attach the following additional equipment, while taking

account of M :

pulse transmitters (as per the table)

mechanically actuated gas volume correctors

electronic compact correctors (devices from other

manufacturers)

encoder index.

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Measuring ranges, custody transfer meteringPressure Smallest

Nominal Meter EC approval German approval loss p at counterdia. size* EEC 1.33-3271.3-AEM-E01 1.33-3271.3-AEM-N01 Q and Up

1 : 30 1 : 50 1 : 100 1 : 160 = 1 kg/mQ Q Q Q Q Q Q

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max min min min min min min

1 : 10 1 : 20 ρ

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DN - [m /h] [m /h] [m /h] [m /h] [m /h] [m /h] [m /h] [mbar] [m /U]

50 G 40 65 6 3 2 1.3 0.65 2 0.1

50 G 65 100 10 5 3 2 1 0.6 3 0.1

80 G 100 160 16 8 5 3 1.6 1 3 1.0

80 G 160 250 25 13 8 5 2.5 1.6 4 1.0

100 G 160 250 25 13 8 5 2.5 1.6 4 1.0

100 G 250 400 40 20 13 8 4 2.5 5 1.0

150 G 400 650 65 32 20 13 6.5 4 5 1.0

150 G 650 1000 100 50 32 20 10 5 1.0

200 G 1000 1600 160 80 50 32 16 6 10.0

* Meter sizes beyond G 1000 on request

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33 3 3 3 3 3 3

)

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Pulse Transmitters and Accessory

Pulse transmitters and connection options

Pulse transmitters built into the totalizer case

Pulse transmitters at themechanical drive shaft

Connection of additional equipment

Optional accessory

RMG's DKZ 04 rotary displacement meter is fitted as

standard with a Reed contact as LF pulse transmitter

(optionally, a double pulse transmitter) with frequencies

of up to a maximum of 0.3 Hz. In addition, LF (Reed or

inductive) pulse transmitters of up to 3 Hz or HF

(inductive) pulse transmitters with frequencies of up to

460 Hz can be fitted (see table).

In addition to the built-in pulse transmitters, another

pulse transmitter can be attached via the standardized

mechanical drive shaft in accordance with the table.

Thanks to the pulse transmitters which can be fitted in

the totalizer or additionally attached via the mechanical

drive shaft (see page 7), the common measuring tasks of

public gas supply can be performed. Furthermore, the HF

pulse transmitters enable high-resolution instantaneous

values (e.g. m /h) to be generated, which are frequently

used on engine test stands.

It is possible in particular to install a compact volume

corrector, e.g. of type EC 900, directly on the meter

which is connected to the LF output of the meter. If an

EC 900 is used, the corrector can be installed together

with a three-way check valve in the factory and the meter

parameters can be programmed accordingly, so that a

ready-to-install entity is delivered.

For temperature measurement, screw-in threaded

sleeves are available in various thread sizes (G¼ /

G½).

To protect the gas meters against soiling, start-up

strainers are optionally available in various designs

(conical strainers or mesh seal).

Encoder index on request.

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Built-in pulse transmitters Drive shaft (optional) Built-on pulse transmitters (optional)

MeterInductive switch Reed switch Inductive switch Reed switch Diodesize

optional optional standard optional Ua M

to be attached to the drive shaft

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[m /P] f at Q [m /P] [m /P] [m /U] [Nmm] [m /P] [m /P] [m /P] [m /P] [m /P]

G 40 0.01 360 Hz 0.1 0.01 0.012

0.0010.010

G 65 0.01 400 Hz 0.1 0.01 0.01 0.010

G 100 0.1 400 Hz 1.0 0.1 0.1

G 160 0.1 460 Hz 1.0 0.1 0.1 0.010

G 250 0.1 400 Hz 1.0 0.1 0.1 5 or 0.10

G 400 0.1 440 Hz 1.0 0.1 0.1 0.10

G 650 0.1 250 Hz 1.0 0.1 0.1

G 1000 1.0 280 Hz 10.0 1.0 1.0 20 0.10 1.0 1.0

3 max 3 3 3 3 3 3 3 3

or

Rotationrate

Permissibletorque

or

No approval forexplosionprotection

0.0

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xU

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xU

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Edition 10/2007We reserve the right for technical changes!

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RMG is your competent partner along the entire chain

ranging from exploration to the supply of final consumers.

Our reliable products and systems offer you full control in

the fields of control engineering and measuring

technology.

Furthermore, we design and build plants according to your

requirements and offer you reliable and state-of-the-art

solutions in station automation as well. Please contact us.

We look forward to your challenges.

Rotary displacement meter DKZ 04

SERVING THE GAS INDUSTRY WORLDWIDE

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