RMG TRZ 04, TRZ 04-K Operating Instructions Manual

Turbine Meters TRZ 04 / TRZ 04-K

OPERATING INSTRUCTIONS

Reliable Measurements of Gas

STATUS February, 1st 2017 Version: 04

Contents

1 INTRODUCTION ................................................................ 1

1.1 Objective of the manual .................................................................. 1

1.1.1 Abbreviations ......................................................................................... 1

1.1.2 Symbols ................................................................................................. 1

1.1.3 Layout of instructions ............................................................................. 2

1.1.4 Using the turbine meter TRZ04 ............................................................. 3

1.1.5 Risk assessment and mitigation ............................................................ 8

1.1.6 Validity of the manual ............................................................................ 9

1.1.7 Transportation ..................................................................................... 11

1.1.8 Delivery ................................................................................................ 12

1.1.9 Dispose of packaging material ............................................................ 12

1.1.10 Storage ............................................................................................. 12

1.2 Structure of the manual ................................................................ 13

1.3 Overview, Function and Application ............................................ 13

CONTENTS

1.4 Method of operation ...................................................................... 16

1.5 Approvals ....................................................................................... 17

1.6 Standards / Guidelines .................................................................. 17

1.7 Validity of meter proving ............................................................... 17

1.8 Measuring ranges .......................................................................... 18

1.8.1 Extension of the measuring range ....................................................... 18

1.9 Accuracy of measurement ............................................................ 20

1.10 Temperature ranges ................................................................... 21

1.11 Pressure loss .............................................................................. 21 

1.12 Pressure tap ................................................................................ 22

1.13 Using gas meters with different types of gases ....................... 23

1.14 Installing the device in the pipeline .......................................... 24

2 INSTALLATION AND COMMISSIONING ........................ 25

2.1 Installation ...................................................................................... 25

2.2 Operating data ............................................................................... 27

2.2.1 Technical Guideline G 13 .................................................................... 28

2.2.2 Perforated-plate straighteners ............................................................. 29

2.2.3 Seals .................................................................................................... 30

2.2.4 Screws ................................................................................................. 31

2.3 Meter head ...................................................................................... 31

2.4 Standard version ........................................................................... 32

Manual TRZ 04 · EN04 · February, 1st 2017

CONTENTS

2.5 Type “G-D” meter head ................................................................. 33

2.5.1 Permissible torques (type “G-D”) ......................................................... 33

2.5.2 Mechanical drive shaft coupling .......................................................... 35

2.5.3 Connection of additional equipment .................................................... 35

2.5.4 Pulse transmitters ................................................................................ 37

2.5.5 Pulse transmitters in the meter head (LF) ........................................... 38

2.5.6 Pulse transmitters in the measuring element (HF 2-D and HF 3-D) .... 38

2.5.7 Tamper contact .................................................................................... 38

2.5.8 Encoder ............................................................................................... 38

2.6 Specifications of the pulse transmitters ...................................... 40

2.7 Temperature measurement ........................................................... 41

2.8 Commissioning .............................................................................. 41

2.8.1 Filling with oil ....................................................................................... 41

2.8.2 Connecting the gas flow ...................................................................... 41

3 OPERATION .................................................................... 43

3.1 Influences on the error of measurement due to operation ........ 43

3.1.1 Intermittent operation ........................................................................... 43

3.1.2 Influence of pulsations ......................................................................... 43

3.1.3 Consequences ..................................................................................... 44

3.1.4 Limiting values ..................................................................................... 44

3.2 Lubrication ..................................................................................... 46

3.2.1 Lubricator ............................................................................................. 46

3.2.2 Specification for lubricating oils ........................................................... 46

3.2.3 Initial lubrication ................................................................................... 47

3.2.4 Relubrication ........................................................................................ 47

3.2.5 Lubrication procedure .......................................................................... 48

3.2.6 Maintenance ........................................................................................ 49

4 LABELLING ..................................................................... 50

5 SPECIFICATIONS ........................................................... 52

5.1 Meas. ranges/Dimensions/Pressure classes of the TRZ 04 ....... 52

5.2 Meas. ranges/Dimensions/Pressure classes of TRZ 04-K ......... 53

5.3 Q

depending on the operating pressure in natural gas ....... 53

min

5.4 Values for 2nd metering or meters without MID approval ........... 54

5.5 Overview of the materials used .................................................... 55

ANNEX ..................................................................................... 56

Certificate for LF-, HF-sensors and Encoder ............................................... 56

Connector pin assignments .......................................................................... 57

Manual TRZ 04 · EN04 · February, 1st 2017

Installation and Commissioning

Introduction

1 Introduction

1.1 Objective of the manual

The manual provides you with the information that is designed for trouble-free and safe
operation.

The TRZ04 is state of the art and conceived and manufactured according to the
recognized safety standards and guidelines. However, risks may arise during use that can
be easily avoided by observing this manual. For this reason, you may only use the device
as intended and in technically sound condition.

1

If the ultrasonic gas meter is not used for its intended purpose, warranty claims
will be void.

Warning

1.1.1 Abbreviations

The following abbreviations are used:

ca. circa, approximately
as app. as applicable
max. maximum
MC Measurement Canada
MID Measurement Instruments Directive
min. minimum
e.g. for example

1.1.2 Symbols

The following symbols are used:

1, 2, … Marks steps within a work operation
..

Manual TRZ 04 · EN04 · February, 1st 2017

Introduction

Installation and Commissioning

1.1.3 Layout of instructions

The following instructions are used:

2

This warning instruction informs you of potentially hazardous situations that can occur
as a result of incorrect operation or human error. If these situations are not avoided,
they can lead to fatal or severest injuries.

Danger

This warning instruction informs you of possible hazardous situations that can occur
as a result of incorrect operation or human error. If these situations are not avoided,
they can lead to fatal or severe injuries.

Warning

Caution

This warning instruction informs you of possible hazardous situations that can
occur as a result of incorrect operation or human error. If these situations are
not avoided, they can lead to slight or minor injuries.

Notice

This warning instruction informs you of potentially hazardous situations that
can occur as a result of incorrect operation or human error. If these situations
are not avoided, they can result in material damage to the device or the vicinity.

This notice may also give to you tips on how to simplify your work. With this
screen, you additionally receive further information on the device or the work
process.

Manual TRZ 04 · EN04 · February, 1st 2017

Installation and Commissioning

Introduction

1.1.4 Using the turbine meter TRZ04

1.1.4.1 Safety instructions

Observe the following safety instructions !!
Non-observance of these safety instructions can lead to a risk of life and limb

and health of the person as well as damage to the environment or property
damage.

Note that the safety instructions in this operating instruction and on the device cannot
cover all possible hazardous situations as the combination of different circumstances is
impossible to predict. To simply follow the instructions specified may not normally be
sufficient enough to ensure for correct operation. Always be observant and also consider
the following:

Danger

3

 Before working with the device for the first time, read through this operating

instruction and, in particular, follow the safety instructions carefully.

 The operating instruction warns against the residual risks for users, third parties,

devices or other material assets. The safety instructions used refer to residual risks
that cannot be avoided due to the design.

 Operate the device only in a sound state and when observing the operating

instruction.

 Also observe the local legal accident prevention, installation and assembly

guidelines.

Notice

Always keep the operating instructions within reach for use at the place of
installation.

For safe operation, the safety instructions must be observed and followed.
The manufacturer is not responsible for any damage that result as a

consequence of not observing the operating instruction.

Manual TRZ 04 · EN04 · February, 1st 2017

Introduction
Installation and Commissioning

4

Danger

Service and maintenance work or repairs that are not described in the
operating instruction must not be carried out without previous consultation
with the manufacturer.

Changes to the device are forbidden.
For safe operation, the technical specifications must be observed and followed.

Performance limits must not be exceeded (chapter 5 Specifications).
For a safe operation, the device must only be used in the scope of its intended

use.
Only use the listed set screws, bolts, nuts and gaskets or parts with similar

characteristics for the installation of the meter in the pipeline (chapter 1.14

Installing the device in the pipeline)

The device should only be used under the intended use for safe operation
(Chapter 1.3 Overview, Function and Application)

1.1.4.2 Hazards during commissioning

Initial start up Initial start-up must only be carried out by especially

trained personal (training by RMG) or by service personal
from RMG.

Notice

After the initial start-up an inspection report shall be drawn up. This, the
operation manual and CE declaration of conformity must always be accessible.

As far as possible all the sharp edges have been eliminated on the device.
Nevertheless, when working on the personal protective equipment must be
used, which must provide the operator.

Manual TRZ 04 · EN04 · February, 1st 2017

Installation and Commissioning

Introduction

Danger

Install the device TRZ04 in accordance with operating instructions. If the TRZ04
is not installed according to the manual, there is possibly an insufficient
explosion protection.

The explosion protection expires !!

Please take care during the installation to the flow direction marked on the
housing by an arrow.

When staff carry out work without sufficient qualification, risks remain
understated when working. Explosion or fire may happen. Perform the work
only if you have the appropriate qualifications and you are an expert.

If you do not use the appropriate tools and materials, components may be
damaged. Use tools that are recommended to you for the job in the operating
instructions.

Mechanical installation Mechanical installation must only be carried out by the

respectively qualified specialist personnel.

5

Electrical installation Installation on components must only be carried out by

qualified electricians.

Mechanical and/or
electrical installation

The specialist personnel require a training especially for
working in potentially explosive environment. Specialist
personnel are persons that can verify a training / further
education according to DIN VDE 0105, IEC 364 or a
similar national standards.

Manual TRZ 04 · EN04 · February, 1st 2017

Introduction
Installation and Commissioning

6

Danger

The installation and removal of the TRZ04 or to the TRZ04 connected
convertor may only be carried out in an explosion-free, de-pressurized
atmosphere. It is important to pay attention to the descriptions of the
operation manual during the installation process.

It is generally recommended to ask the RMG Service for any installation or
removal.

After working on pressurized components, a control of leaks must be carried
out.

All points above have to be considered for any repair and maintenance and
in general, when an opening of the meter (convertor) is required.

Parts to lock the flanges, locking screws, fittings and check valves, oil
supply and the pressure tap fittings, valves, HF pulse device, protecting pipe
and rotating adapter may not be opened during operation.

1.1.4.3 Danger when using, servicing and maintaining the device TRZ04

Operating personnel The operating personnel are to use and operate the

device within the scope of the intended purpose.

Maintenance personnel Work on the device must only be carried out by specialist

personnel that can carry out the respective work assigned
to them as a result of their training, knowledge and
experience as well as the applicable regulations. These
specialist personnel are familiar with the legal guidelines
for accident prevention and can evaluate and avoid
possible risks by themselves.

Maintaining and cleaning Maintenance and cleaning must only be carried out by the

respectively qualified specialist personnel.

Danger

If staff carry out work without sufficient qualification, risks may be
underestimated when working. Explosion or fire may happen. If work is
carried out in hazardous areas on voltage supporting equipment, resulting
sparks may cause an explosion.

Manual TRZ 04 · EN04 · February, 1st 2017

Installation and Commissioning

Introduction

If the unit is not cleaned in accordance with the operating instructions, the
device may be damaged. Clean the unit only in accordance with the operating
instructions.

When not using appropriate tools, components can be damaged. The explosion
protection expires.

Danger

- Clean with a damp cloth!

The TRZ04 may only be used as intended !!
(Chapter 1.3 Overview, Function and Application).

Avoid any use of the TRZ04 as possible climbing aid or attachments of TRZ04
as possible handholds !!

Danger

7

1.1.4.4 Specialized knowledge required

Notice

Persons working with or on the device must have the following knowledge:

 Training / education for working in potentially explosive environments
 The ability to correctly assess dangers and risks when using the device.

Possible dangers are, e.g., components under pressure or the result of
incorrect installation.

 Recognize dangers that could be caused by the used flow medium.
 Training / education by RMG for working with gas measuring instruments.
 Education / instruction in all country-specific standards and directives to be

observed for work that is to be carried out on the device.

Manual TRZ 04 · EN04 · February, 1st 2017

8

Introduction

Installation and Commissioning

1.1.5 Risk assessment and mitigation

The TRZ04 subjects to risks in its use, which were judged by qualified staff of the company
RMG. Risks may arise due to high pressures, more rarely by too low. Even work outside
the permissible temperature range can lead to danger. Invalid current and voltage values
can trigger explosions in hazardous areas.
The risk assessment assumes that when installing or removing a turbine a draining and
venting of the pipeline takes place. Thus, and only then no explosive gas mixture is in the
pipeline.
Of course (chapter 1.1.4.4 Specialized knowledge required) only work by trained
personnel are permitted, which is also trained to know proper tools and use only this.
These risks have been considered during the development phase and action were taken to
minimize these risks.

Risk mitigation measures:

- All pressurized parts are designed in accordance to AD 2000 regulations, PED
Annex 1

- The complete design being pressurized is verified by the TÜV Hessen

- All pressurized parts are made with material certificate; there is a traceability to the
batch tracking of all pressurized parts

- The mechanical properties of all relevant pressurized components are checked by
tensile testing, impact testing and hardness testing

- In addition, non-destructive testing were applied: X-ray and ultrasonic testing of the
meter housing for defects in material, surface crack detection by magnetic particle
and dye-penetration

- With pressure tests 1.5 times of the intended operating pressure the strength of the
components were verified; leak test were carried out at 1.1 times of the intended
operating pressure. Successful tests were marked

- The maximum operating pressure is stated on the nameplate of the device, as well

as the temperature range. Operation of the device is only permitted within the
indicated ranges.

Manual TRZ 04 · EN04 · February, 1st 2017

Installation and Commissioning

Introduction

For any work in an explosive atmosphere (all areas):

Danger

- The pulse output of the turbine meter has to be connected to

intrinsically safe circuits, only.

- For maintenance and repair work only tool must be used, which is

approved for Ex zone. 1

- Otherwise, work must be carried out only if there is no explosive

atmosphere

- Danger of ignition caused by impact or friction must be avoided.

- In hazardous areas, the wiring / installation must be performed by

trained personnel in accordance to EN 60079-14 and according to
national regulations

- Skilled persons are in accordance to DIN VDE 0105 or IEC 364, or

comparable standards

- Use only trained and qualified personnel. Work on the measuring

system may only be carried out by qualified personnel and must be
checked by a specialist supervisor.

- Qualified persons are able to carry out such work. Qualification is

valid due to their training, experience or through instruction and their
knowledge of relevant standards, regulations, accident prevention
regulations and plant conditions for the safety of people. It is essential
that these people are able to recognize and avoid possible dangers.

9

1.1.6 Validity of the manual

This manual describes the turbine meter TRZ04. The TRZ04 is only a part of a complete
on site system. Observe also the instructions of other components of the site system. If
you find contradicting instructions, please contact RMG.

Notice

Make sure that the performance of the power connector corresponds to the
data on the nameplate. Additionally observe any existing national
regulations in the country. Use cable suitable for the cable glands.

Manual TRZ 04 · EN04 · February, 1st 2017

Introduction

Installation and Commissioning

10

Danger

Perform the work only if you have the appropriate qualifications and you are a
trained specialist.

1.1.6.1 Hazards during Operation

Please take care of the information provided by the plant manufacturer and/or plant
manager.

1.1.6.2 Danger during operation in hazardous areas

Operate the device in perfect and complete condition.
When you perform technical modifications to the instrument, a safe operation can no
longer be guaranteed.

Danger

Use the device only in the original condition. The TRZ04 may be operated in
explosion zone 1, but only within the permitted temperatures (Chapter 1.10

Temperature ranges)

1.1.6.3 Operator responsibility

Take care as plant manager that only sufficiently skilled personnel will work on the device.
Ensure that all employees who handle the equipment have read and understood these
instructions. Additionally, you are obliged to train staff on a regular basis and to inform
them about any dangers. Ensure that any work carried out on the device is done by
qualified personnel and checked by responsible specialists. You must establish clearly the
responsibilities for installation, operation, troubleshooting, maintenance and cleaning.
Point out to your staff any risks involved when using the device.

Manual TRZ 04 · EN04 · February, 1st 2017

Installation and Commissioning

Introduction

1.1.7 Transportation

The device is packaged customized according to the transport requirements.

Warning

Risk of injury during transport

Any foot screws must be fitted, if they are used as transit protection against
rolling and tipping.

Take additional care that a rolling and tilting is safely prevented.
To lift the meter only the special lifting eyes / eye bolts may be used.
Pay attention to the maximal loads for the lifting devices (chapter 5

Specifications) – don’t exceed those.

Make sure that the load is fastened securely before lifting.
Do not stand under lifted loads.
During lifting and/or depositing the device may slip, tip over or fall.

Disregarding the maximum load capacity of the lifting device, the device may
fall down. For any people standing nearby, there is a significant risk of serious
injury.

11

If the unit is supplied on a Euro pallet, the unit can be transported using a lift
truck or a forklift.

During the transport the meter has to be protected against shock or vibration.

The meter or its additionally mounted spool pieces are equipped with flanges
that are protected with a sticker foil or blind plugs made of plastic. These must

be removed completely before installation in the pipeline. Remaining rests of
these protections may change the flow pattern and may result in a
measurement error !!

For any transport e.g. for recalibration we ask you to use these protections.

Manual TRZ 04 · EN04 · February, 1st 2017

12

Introduction

Installation and Commissioning

1.1.8 Delivery

Supplied number of parts may differ depending on the optional customer order. "Usually"
is following in the delivery:

Part Quantity

Turbine meter TRZ04 1

1 small bottle of oil for lubrication 1

Manual 1

Test report 1

Calibration certificate 1

Material test report 1

Certificate strength 3.1 .. optional

… …

1.1.9 Dispose of packaging material

Dispose the packing material in an environmentally friendly way in accordance to the
national standards.

1.1.10 Storage

Avoid long periods of storage. Check the device after any storage for damage and
functionality. Ask for a check from the RMG service after a storage period for the device of
over one year. In this case please send the device to RMG.

Notice

For storage, a dry and protected space has to be provided.
It is important to ensure that all open pipe pieces must be sealed.

Manual TRZ 04 · EN04 · February, 1st 2017

Installation and Commissioning

Introduction

1.2 Structure of the manual

The introduction of this manual contains two parts. In the first part general guidelines are
listed; the symbols used and structure of advices are given, but also issued is a risk
assessment. In addition, it contains guidelines for the transport and storage of the TRZ04.
The second part introduces the operation of TRZ04; there are basic standards listed;
pressure and temperature ranges are given limiting the use of the TRZ04.

The second chapter describes the use of TRZ04. It explains how a high accuracy can be
achieved, how data can be received by the encoder and tapped there. The third chapter
provides recommendations on how the current operation can be ensured. These include
the accuracy influencing flow disturbances as well as regular lubrication of the bearings of
the turbine meter.

The fourth chapter describes the marking of the TRZ04 and in the fifth the technical data of
TRZ04 are summarized. The appendix includes details to the previous chapters, a
summary of certificates and approvals.

13

1.3 Overview, Function and Application

The TRZ 04 and TRZ 04-K are used to measure volume flow rates of non-aggressive
gases and fuel gases, especially natural gas. Measurement of corrosive gases is only
possible with special designs. The measurement of liquids is not possible and will destroy
the device.

The TRZ 04 is a flow rate meter, which can be used for custody transfer flow rate
measurement. The TRZ 04 K, however, can only be used for operational volume flow rate
measurements. Both types measure the gas quantity, means the volume flowing through
the unit at the actual pressure and temperature. Both determine the volume flow rate at the
actual conditions. The volume flow rate of the gas flowing through the meter is indicated by
a mechanical totalizer operating in m³.

In addition, the turbine can be equipped to supply high or low frequency pulses and reed
contacts can be fitted, too. The measured number of pulses are proportional to the volume
that has passed the meter. These pulses can be further processed by volume correctors or

remote totalizers.

The most important differences between the versions TRZ 04 und TRZ 04-K are:

TRZ 04



Approved for custody transfer metering

 Installation length: 3 x DN

Manual TRZ 04 · EN04 · February, 1st 2017

Introduction

Installation and Commissioning



Accuracy  0.5% (above 0.2 Q



Blade monitoring system

TRZ 04-K



For secondary metering.

max

)

14



Installation length:  1.5 x DN (DN 50: 3 DN)



Accuracy  1% (above 0.2 Q

max

)

The following applies to all meter types:



Maximum operating pressure: 100 bar (not for gas meters with a plastic turbine wheel)



Meter sizes from G 65 to G 1600



Measuring range 1:20 at operating pressure pm = 1 barg;



Measuring range up to 1:100 at pm >= 3 barg (see table: Q



Connections in compliance with DIN or ANSI are available



Special designs for aggressive gases are available



Available for low temperatures (< - 20°C)



All gas meters can be operated in any position up to the nominal diameter of

depending on p

min

min

DN 200.

)

Notice

The meters with nominal diameters from DN 50 to DN 200 are approved
for custody transfer metering (up to G 1600).

The nominal diameters from DN 250 are special versions without MID
approval for which RMG does not guarantee the availability (only on
request).

The TRZ 04 and TRZ 04-K are approved for the use in explosive areas; the indication is:

II 1G Ex ia IIC T4 (HF-Sensors)
II 2G Ex ib IIC T6 (Encoder)

The corresponding conformity certificates can be found in the appendix.

Manual TRZ 04 · EN04 · February, 1st 2017

Installation and Commissioning

Introduction

Danger

To operation the encoder you have to care of:
The encoder must be mounted and removed by a qualified electrician, as

sensitive electronic circuits are part of the encoder.
Attention: Risk of destruction due to static electric discharge, for example

caused by the friction of clothing.
Do not change anything at the encoder, otherwise the approvals and certificate

lose their validity.

Information about temperature limits are given in chapter 1.10 Temperature ranges.

The TRZ04 meets the standards, guidelines and regulations:

 Chapter 1.6 Standards / Guidelines and the appendix

These technical limitations you must comply with the TRZ04 for safe operation:

 Chapter 5 Specifications

15

The device may only be operated with the following types of gases. Only with these stated
gases a safe operation is ensured:

•

Gases of class 1

•

Gases of class 2

•

Gases of class 3

The friction of the gas components must be within the limits in accordance with the
EN 437: 2009 are for test gases.

The following instructions must be observed:

Notice

The RMG TRZ 04 and TRZ 04-K can be operated in any mounting orientation up
to DN200, from the DN 250 is a horizontal orientation is required.

If a mounting orientation is specified when ordering, the meter has to be
installed in this orientation.

It is also important to ensure that the filling port of the lubricator faces upwards.

Manual TRZ 04 · EN04 · February, 1st 2017

16

Introduction

Installation and Commissioning

1.4 Method of operation

The method of operation of the mechanical turbine meter is based on the measurement of
the gas velocity. The velocity of the gas flowing through the gas meter is increased in the
flow straightener and the gas strikes the turbine wheel in a defined flow cross section. In
the flow straightener, unwanted vortices, turbulences and asymmetries are removed or
reduced. The turbine wheel is mounted axially, while the blades of the turbine wheel are
arranged at a certain angle to the gas flow. Within the measuring range (Q
the rotational speed of the turbine wheel is almost proportional to the mean gas velocity
and, therefore, to the rate of flow. The number of rotations is a measure of the volume that
has flowed through. The rotary movement of the turbine wheel is transmitted by a
magnetic coupling to the unpressurized meter head. Downstream of the coupling, there is
a gearing which reduces the rotational speed of the turbine wheel to match the mechanical
totalizer. Two LF pulse transmitters (reed contacts) and a tamper contact are located on
the totalizer.

Turbine
wheel

Meter head with
mechanical index,
Encoder and LF
pulse transmitters

min

- Q

max

),

Flow
straightener

Figure 1: Sectional drawing of a turbine meter.

Downstream of the turbine wheel, a cam wheel (reference wheel) is located on the same
shaft. Two HF sensors (proximity switches) generate a signal if a blade of the turbine
wheel (HF 3-D) or a cam of the reference wheel (HF 2-D) passes them. In this way, two
pulse sequences are generated which are out of phase. The generated pulses can be
further processed for secondary volume measurements or flow measurements.

Reference
wheel

HF pulse
transmitters

Manual TRZ 04 · EN04 · February, 1st 2017

Installation and Commissioning

1.5 Approvals

Type TRZ 04 has been approved for custody transfer metering.
The following approvals have been obtained:

MID approval No. T10417
PED approval No. CE 0091

Introduction

Independent whether the turbine meter can be remotely read (via the encoder) it is fitted
with a metrological controlled mechanical index. The reading of this index is the
measurement result that serves as the basis for billing.

Type TRZ 04-K has not been approved for custody transfer metering. The following
approvals have been obtained:

PED 2014/68/EU / DGRL2014/68/EU ISG-22-12-1980 (TRZ04)
ISG-22-12-1994 (TRZ04-K)

1.6 Standards / Guidelines

All RMG turbine meters have passed the disturbance measurements in compliance with
OIML Recommendation IR-32/89, Annex A, with slight and heavy flow disturbances.
Therefore, this meter design meets the requirements for installation in compliance with
Technical Guideline G13, Sec. 1. Test specifications are as laid down in PTB Testing
Instructions, Vol. 4, Volume gas meters, 2nd revised edition of 1992.

The RMG turbine meters of type TRZ 04 comply with EN 12261 and the European
Measuring Instrument Directive 2004/22/EG (MID).

17

1.7 Validity of meter proving

The turbine meters of type TRZ 04 which are suitable for custody transfer metering must
be subjected to subsequent meter proving at regular intervals. The validity of meter
proving is determined in the German Metering and Calibration Rules (MessEV, Edition 11,
December 2014) with the following periods:

Turbine meters without lubricator 8 years
Turbine meters with flow range 65 m3/h to  4.000 m3/h 12 years

Turbine meters with flow range > 4.000 m3/h to < 16.000 m3/h 16 years
Turbine meters with flow range  16.000 m3/h unlimited

Manual TRZ 04 · EN04 · February, 1st 2017

18

Introduction

Installation and Commissioning

1.8 Measuring ranges

The measuring ranges are between 10 and 25.000 m3/h (flowing conditions). A measuring
range is specified for each meter size. It is limited by the minimum flow rate Q
maximum flow rate Q

(see table on page 35).

max

For types TRZ 04 this is the flow range where the gas meter must indicate correct values
within the error limits specified by the German Metering and Calibration Rules.

Turbine meters of type TRZ 04 have measuring ranges up to 1:30 even under atmospheric
pressure. If a high-pressure test is conducted in compliance with Technical Guideline G 7
(PTB), the measuring range can be extended to 1:100. Then the minimum flow rate Q
HP is the lowest test point during high-pressure testing. Type TRZ 04 may then be used
for billing purposes within the specified HP flow and density ranges.

The measuring range of type TRZ 04-K is 1:16.

1.8.1 Extension of the measuring range

and the

min

min

In the range of 0.2 Q

max

to Q

, the measuring behavior of turbine meters is

max
determined by the aerodynamic conditions in the flow channel and the measuring cross
section. By means of many series of tests conducted both under atmospheric pressure
and under higher pressures and with an appropriate rating for such ranges, it is possible to
achieve a deviation of the calibration curve under atmospheric conditions and under high­pressure conditions of < 0.5% in the flow range of

0.2 Q

max

to Q

. In the lower flow range, the measuring behavior is determined by the

max
relationship between the gas flow driving the measuring wheel and the slowing-down
torques due to drags (bearings and totalizer). The driving torques increase linearly with the
density and quadratic with the velocity of the gas to be measured. Due to the physical
conditions, the measuring range is therefore enlarged in relation to the density. The lower
flow limit shifts in the direction of smaller loads (see also the table in chapter 5.3 Qmin
depending on the operating pressure in natural gas).

Use the formula below as approximate equation:

2,1



QQ

minmd

3

)h/m(



The density  can be determined with the following approximate formula:

3



nm

)m/kg(x)1p(

Manual TRZ 04 · EN04 · February, 1st 2017

Installation and Commissioning

The influence of the temperature is not taken into account in this formula.

With:

Qmd: Minimum flow rate at flowing conditions

: Minimum flow rate of the gas meter

Q

min

pm: Operating pressure in bar

: Density in kg/m3 (Density of air at 20°C and 1.01325 bar  1.2 kg/m3)

n: Standard density of the gas (standard density of natural gas  0,8 kg/m3)

Introduction

19

Manual TRZ 04 · EN04 · February, 1st 2017

20

05010

0

Introduction

Installation and Commissioning

1.9 Accuracy of measurement

The following error limits apply within the permissible measuring range:

Measuring range: Q

Calibration limit1)
TRZ 04

TRZ 04-K

 2 %  1 %
 1 %  0.5 %

 2 %

(DN 50, DN 80:  3 %)

1)

maximum error due to the German Metering and Calibration Rules

It will be checked whether these limits are observed. They also apply to the high-pressure
range.

+2

min

to 0.2 Q

0.2 Q

max

to Q

max

max

 1 %
(DN 50:  1.5 %)

+1

%0

-1

-2

1

Figure 2: Calibration curve of a turbine meter

The reproducibility, i.e. the difference between the results of two measurements under
identical conditions, is as follows:

TRZ 04, TRZ 04-K:   0.1%

Manual TRZ 04 · EN04 · February, 1st 2017

Installation and Commissioning

Introduction

1.10 Temperature ranges

For the standard designs of the turbine meters of types TRZ 04 and TRZ 04-K, the
following temperature ranges are permitted:

MID:

-25°C to +55°C (TRZ 04 for custody transfer metering)

PED 2014/68/EU:

-20°C to +80°C (Spheroidal graphite iron)

-40°C to +80°C (cast steel)

ATEX:

-25°C to +70°C (T4)

-25°C to +55°C (T6)

21

1.11 Pressure loss

The pressure loss of RMG turbine meters has been reduced to a minimum thanks to
modifications with regard to design. The measuring points for pressure loss are located 1 x
DN upstream and downstream of the gas meter. The pressure loss is calculated using the
following formula:

2

Q

Zp 

p

where:
p pressure loss [mbar]
Z

pressure loss coefficient

p

 density [kg/m3]
Q

volume flow rate at measurement conditions [m3/h]

m

DN is the nominal diameter of the gas meter [mm]

Gerätetyp Device type
TRZ 04 / TRZ 04-K turbine meter 3000

L1 perforated-plate straightener as per ISO/DIN 3150
L2 perforated-plate straightener as per ISO/DIN 6300
L3 perforated-plate straightener as per ISO/DIN 9450
LP-35 perforated-plate straightener as per RMG standard 1260
RB 19 tube-bundle straightener as per ISO/DIN 1260

DN

m

4

Zp

Manual TRZ 04 · EN04 · February, 1st 2017

22

Introduction

Installation and Commissioning

The values for Zp are approximate mean values. The exact value is calculated from the

pressure loss, which is determined during testing the turbine meter.

Example of calculation of the pressure loss for a turbine meter with upstream perforated­plate straightener:

TRZ 04, size DN 150

Qm = 650 m3/h
 = 1.3 kg/m3 (natural gas)

From the table on the previous page you may find:

Z

p(TRZ04)

= 3000

Z

p(LP-35)

= 1260

Calculation:

Z

p(ges)

= 3000 + 1260

= 4260

2

650



3.14260 p
150

4

= 4.2 mbar

1.12 Pressure tap

A pressure tap has been provided to connect the pressure transducer of a volume
corrector or a pressure gauge to read the pressure at measurement conditions prevailing
inside the gas meter. This pressure tap is identified by “pm”.

Manual TRZ 04 · EN04 · February, 1st 2017

Installation and Commissioning

Introduction

1.13 Using gas meters with different types of gases

Gas type Symbol Density at

0°C

Meter
case

Comments

1.013 bar
Acid gas Special Special measuring element
Air Ar 1.29 Standard
Ammonia

NH3

0.77 Standard O-rings/lubrication
Argon AR 1.78 Standard
Biogas Special Special measuring element
Butane C4H10 2.70 Standard
Carbon dioxide

CO2

1.98 Standard Exception: food industry
Carbon monoxide CO 1.25 Standard
Ethan
Ethylene (gaseous)
Freon (gaseous)

C2H6
C2H4
CCI2F2

1.36 Standard

1.26 Standard Special design

5.66 Standard O-rings/lubrication
Helium HE 0.18 Standard Reduced measuring range
Hydrogen
Hydrogen sulphide (0.2 %)
Methane

H2
H2S
CH4

0.09 Special Reduced measuring range

1.54 Standard Special measuring element

0.72 Standard
Natural gas 0.8 Standard
Nitrogen
Oxygen (100%)
Pentane
Propane
Propylene (gaseous)
Sulphur dioxide

N2
O2
C5H12
C3H8
C3H6
SO2

1.25 Standard

1.43 Standard Special design

3.46 Standard

2.02 Standard

1.92 Standard Special measuring element

2.93 Special Special design
Town gas

23

Manual TRZ 04 · EN04 · February, 1st 2017

24

Introduction
Installation and Commissioning

1.14 Installing the device in the pipeline

The units of RMG are equipped with flanges.
The flange connections for the connected pipes must comply with the connecting

dimensions of the flanges of the unit:

•

ANSI-pressure levels: Flange in accordance with ASME B 16.5.

•

DIN-pressure levels: Flange in accordance with DIN EN 1092.

Danger

Gas leakage for the wrong gaskets
If wrong flange gaskets are used for connecting turbine gas meters, gas may

flow through leaks resulting in an explosive gas mixture.
Poisoning and explosion hazard !!
In addition, the stress of the flange is increased inadmissible when tightening

the bolts.
Make sure that no flange gaskets are protruding into the pipe.
Pay attention to a save mounting / hanging-up of the TRZ04 during assembly to

avoid the risk of bruising. Avoid to have your fingers (or other body parts)
between any openings and gaps that are moved together when tightening the
flanges !!

Notice

Malfunction due to incorrect gaskets
When wrong flange gaskets are used for turbine meters, which protrude into

the pipe, the measurement accuracy may be affected.
Make sure that the flange gaskets on the sealing surfaces are not protrude

into the pipe.

The stability of the flange connection for gaskets and bolts with certain material properties
(see chapter 2.2.3 Seals and chapter 2.2.4 Screws) was proved to AD2000 regulations.
Other screw / flange - variants were not verified.

Manual TRZ 04 · EN04 · February, 1st 2017

Installation and Commissioning

d

2 Installation and Commissioning

2.1 Installation

Notice

Any components affecting the gas flow must be avoided directly upstream of

1)

the turbine meter (see DVGW Guideline G 492 II

and PTB Guideline G 13 2).

An inlet pipe of a minimum of 2 x DN is required upstream of the RMG TRZ
04 turbine meter. The inlet pipe must be designed as a straight pipe section
of the same nominal diameter as the gas meter. If there is a heavy flow
disturbance, it is necessary to use flow straighteners (see table on next
page). A pipe or fitting (bend) of the same nominal diameter as the gas meter
and an overall length of 2 x DN must be installed downstream of the gas
meter.

Temperature measuring instruments may only be installed at a distance of 1
x DN or in the case of nominal diameters of  DN 300 at a minimum distance
of 300 mm.

If there are flow disturbances (e.g. due to a gas pressure regulator) upstream
of the inlet pipe, it is also necessary to use a perforated-plate straightener.
You can use perforated-plate straighteners complying with ISO 5167-1 or of
type RMG LP-35, the latter resulting in a pressure loss which is 2.5 times
lower than that of the standardized flow straightener.



2 DN

LP-35 perforated-plate straightener

25



2

D



1 DN

Perforated-plate straightener

N

d

DN

= e = 0.13 DN

•

DN

d

e

 The opening angle of reducers or expansion fittings installed upstream of a turbine

meter of type TRZ 04 or TRZ 04-K must not exceed 30°.

 In order to obtain precise measurement results, the turbine meter must be installed in

the gas line in such a way that no seals protrude from the flanges into the pipeline.

1)

can be ordered at DVGW, Josef-Wirmer-Str. 1-3, D-53123 Bonn (www.dvgw.de)

2)

can be ordered at PTB, Bundesallee 100, D-38116 Braunschweig (www.ptb.de)

Manual TRZ 04 · EN04 · February, 1st 2017

26

Installation and Commissioning

Notice

A protective screen should be installed on the intake side of the gas meter to
protect the turbine meter against any foreign particles possibly contained in
the gas flow. The protective screen can be a perforated plate of sheet metal
with a hole diameter of 3 mm which is available from RMG.



The pm tap which is located on the RMG turbine meter is the pressure-measuring point
which was used for taking the relevant pressure at measurement conditions during
meter proving. This pressure-measuring point is used for connecting pressure­measuring instruments such as flow computers or volume correctors. Other connection
options (e.g. for temperature measurement) can be supplied on a pipe section on the
output side of the gas meter.

Danger

Protect the turbine meter from damage caused by heavy flow variations, e.g. if
the downstream pipeline system must be filled or blown off.

Danger

If it is necessary to do welding work on the gas line, such work can only be
performed at a safe distance from the gas meter. Extreme temperatures
prevailing in the gas line in the proximity of the gas meter can result in a
permanent damage to the gas meter.

Danger

All electrical connections between the gas meter and the amplifiers or the flow
computer must be carried out in compliance with the installation instructions.
Make sure that these connections are intrinsically safe.

Manual TRZ 04 · EN04 · February, 1st 2017

Installation and Commissioning

Danger

Any liquids remaining in the gas line after hydrostatic testing can damage the
interior parts of the gas meter. If hydrostatic testing is necessary, the turbine
meter must be replaced by a pipe section. Make sure that no liquid remains in
the gas line upstream of the gas meter after hydrostatic testing.

2.2 Operating data

Recommended threshold values for maximum service life and maximum accuracy:

Notice

Maximum overload:
Maximum flow or shock

loads
Maximum pressure

< 20% above Q
< 0.01·Q

max

/sec

e.g. starting up 0 - 100%: > 100 sec
< 0.1 bar/sec

change:
Maximum flow pulsation:
Particle size in the gas

< 5%
< 5 m

flow:
Lubrication of bearings

See chapter on “Lubrication”.
Lubrication intervals depend on the condition

of the gas (condensate, rust or dust)

Vibration / mechanical
shock:

< 1 mm/sec (vibration velocity)

These specified data must be determined and checked during commissioning, prior to
filling and during the start-up and running-in phases of the gas meters. If more than one
threshold value occurs at the same time, appropriate action must be taken in the station to
improve the measuring conditions.

, for a short time (< 30 sec)

max



1% of Q

ˆ

max

/sec

27

Manual TRZ 04 · EN04 · February, 1st 2017

28

Installation and Commissioning

Notice

The operator must record all measuring data (gas meter and operating data)
during the whole period of operation in order to detect the causes of a
possible destruction of the gas meter at an early stage and take corrective
action in good time.

Corrective action or reduction of the critical operating conditions can be
achieved by the following measures for example:

 Start-up screens (mesh width < 0.15 mm)
 Filters
 Perforated plates (Ø 3 - 4 mm) protecting the gas meter
 Valves with control drive mechanism (flow variation)
 Non-return valves (pulsation and return flow)

2.2.1 Technical Guideline G 13

The installation conditions for new stations complying with TRG G 13 and the simpler
installation conditions for RMG turbine meters are compared in the table below.

Type of flow
disturbance

Installation cond.
As per TR G13

Installation cond.
for RMG gas

Comments

meters Type TRZ
04

The outlet pipe can also be
designed as a bend.

Flow disturbances upstream
of this inlet pipe need not be

None

Inlet pipe  5 DN
Outlet pipe  2 DN

Inlet pipe  10 DN

Inlet pipe  2 DN
Outlet pipe  2 DN

considered, if the re­quirement for an alternating
and pulsating flow is fulfilled

Bend

Space bend

Inlet pipe  5 DN Inlet pipe  2 DN

Inlet pipe  5 DN

Inlet pipe  2 DN

and additionally 2
perforated-plate
straighteners or one
tube-bundle straight­ener

Manual TRZ 04 · EN04 · February, 1st 2017

Installation and Commissioning

Gas pressure
regulator with sound
attenuator

Inlet pipe  5 DN

Inlet pipe  2 DN
and additionally
one perforated-plate
straightener

Gas pressure
regulator without
sound attenuator

Diffuser

Inlet pipe  5 DN
and additionally
two perforated-plate
straighteners

Inlet pipe  5 DN

Inlet pipe  2 DN
and additionally
one perforated-plate
straightener

Inlet pipe  2 DN

and additionally
one perforated-plate
straighteners

Diffuser with swirling
flow

Inlet pipe  5 DN
and additionally

Inlet pipe  2 DN

two perforated-plate
straighteners

2.2.2 Perforated-plate straighteners

29

There are the following options for flow straighteners:

RMG L1 - L3 perforated-plate

straighteners complying with ISO 5167-1

and DIN 1952

e

d

a

RMG LP-35 perforated-plate straightener

D

d

D

Features ISO / DIN L1 to L3 RMG LP-35

Hole diameter d
Plate thickness e
Plate clearance a
Opening ratio m
Pressure loss, dyn. p

d  0.05 D

e  d

0.5 D  a  1 D

0.2  m  0.4

0.04 D 0.13 D
e = d 0.13 D

0.5 D -

0.3 0.6

5 - 15 (c²  / 2) 2 - 15 (c²  / 2)

D

e

Manual TRZ 04 · EN04 · February, 1st 2017

30

Installation and Commissioning

In conjunction with RMG turbine meters, these flow straighteners fulfil the requirements of
Technical Guideline G 13 and are approved under EU approval No. D 81 / 7.211.10 for
turbine meters.

2.2.3 Seals

It must be guaranteed that flange seals of RMG turbine meters do not protrude from the
flange into the gas line.

The stability of the flange connection has been verified for seals with the following
maximum material properties of AD2000 guideline:

− gaskets: k0 x KD = 20 x bD | k1 = 1.3 x bD [N/mm]

− grooved seals: k0 x KD = 15 x bD | k1 = 1.1 x bD [N/mm]

− spiral seals: k0 x KD = 50 x bD | k1 = 1.4 x bD [N/mm]

− octagonal ring joint seal: KD = 480 N/mm2

For recommended dimensions, see the tables below.

d1

1.5 up to 5 mm

d2

Gaskets

DN d1 d2
50 2" 77 107 107 105 107 107
80 3" 90 142 142 137 142 142

100 4" 115 162 162 175 168 168
150 6" 169 218 218 222 225 225
200 8" 220 273 273 279 285 292

PN 10 PN 16 ANSI 150 PN 25 PN 40

Grooved seals

DN d1 d2 d1 d2
50 2" 69,8 88,9 65 87
80 3" 98,4 123,8 95 121

100 4" 123,8 154,0 118 144
150 6" 177,8 212,7 170 204
200 8" 228,6 266,7 220 258

ANSI 300 / ANSI 600 PN 64

Manual TRZ 04 · EN04 · February, 1st 2017

Installation and Commissioning

Spiral seals

DN d1 d2 D1 d2 d1 d2
50 2" 69,9 85,9 66 84 69,9 85,9
80 3" 101,6 120,7 95 119 101,6 120,7

100 4" 127,0 149,4 120 144 120,7 149,4
150 6" 182,6 209,6 174 200 174,8 209,6
200 8" 233,4 263,7 225 257 225,6 263,7

ANSI 300 PN 64 ANSI 600

2.2.4 Screws

The stability of the flange connection was verified using the screws listed in this section in
combination with the seals listed in the previous section. Other screw / flange variants
were not verified.

31

Temperature ranges for screws and nuts

-10°C to +80°C -40°C to +80°C
Pressure Variant 1 Variant 2 Variant 3

up to and
including
40 bar

from 40 bar Screw bolts complying

Screws complying with
DIN EN ISO 4014
made of material 5.6,
Nuts complying with
DIN EN ISO 4032
made of material 5-2

with ANSI B1.1
made of material
ASTM A193 Grade B7,

Nuts complying with
ANSI B1.1
made of material
ASTM A194 Grade 2H

Screws complying with
DIN EN ISO 4014
made of material
25CrMo4,

Nuts complying with
DIN EN ISO 4032
made of material
25CrMo4

Screw bolts complying
with ANSI B1.1
made of material
ASTM A320 Grade L7,

Nuts complying with
ANSI B1.1
made of material
ASTM A320 Grade L7

Screw bolts
complying with
ANSI B1.1
made of material
42CrMo4,

Nuts complying
with ANSI B1.1
made of material
42CrMo4

Anti-fatigue bolts
complying with
DIN 2510
made of material
25CrMo4,

Nuts complying
with DIN 2510
made of material
25CrMo4

2.3 Meter head

The RMG turbine meter TRZ 04 or TRZ 04-K is fitted with the meter head of type “G”.

Manual TRZ 04 · EN04 · February, 1st 2017

32

Installation and Commissioning

Figure 3: Type “G” meter head

2.4 Standard version

The new standard design is type “G” meter head without mechanical drive shaft couplings.
Therefore, this design provides no options for connecting additional mechanical
equipment. The totalizer has the following features:

 2 LF pulse transmitters (reed contacts)
 1 tamper contact
 Encoder type ENCO 08 (option)
 Plastic case (optionally aluminum)
 IP 66 + IP 67 protection class
 Universally readable
 Rotatable by 355° without breaking a seal

Notice

The electrical connector must be covered by a cap closure or a connecting
plug! Otherwise moisture may ingress into the meter head.

Manual TRZ 04 · EN04 · February, 1st 2017

Installation and Commissioning

The tamper contact switches when a magnet is held outside the meter head
close to the reed contacts.

2.5 Type “G-D” meter head

33

Figure 4: Type “G-D” meter head

Design and features like in the case of the type “G” meter head but additional with a
mechanical drive shaft in compliance with EN 12261 on the top side of the case. This
version is only possible with aluminum cap.

The direction of rotation of the drive shaft (with view on the drive shaft) is clockwise.

For dimensions and instructions for the connection see the description “Mechanical drive
shaft coupling”. Especially note the maximum permissible torques!

2.5.1 Permissible torques (type “G-D”)

Q

Nominal dia. Sizes

max

Q

[m3/h]

min

M

[Nmm]

max

Manual TRZ 04 · EN04 · February, 1st 2017

34

Installation and Commissioning

DN G m3/h 1:20 1:10 1:5 1:20 1:10 1:5

50 65 100 - 10 20 - - ­80 100 160 8 16 32 - 1,0 2,0
80 160 250 13 25 50 1,4 2,4 3,9
80 250 400 20 40 80 1,4 2,3 3,9
100 160 250 13 25 50 0,14 0,6 1,3
100 250 400 20 40 80 0,5 1,1 2,1
100 400 650 32 65 130 0,8 1,6 3,3
150 400 650 32 65 130 0,5 1,5 2,4
150 650 1000 50 100 200 1,3 2 3,3
150 1000 1600 80 160 320 11,5 15,7 37,3
200 1000 1600 80 160 320 11 15 37
200 1600 2500 130 250 500 11 15 37

Manual TRZ 04 · EN04 · February, 1st 2017

Installation and Commissioning

7

2.5.2 Mechanical drive shaft coupling

Type “G-D” meter head provides a mechanical drive shaft where additional equipment,
e.g. slip-on pulse transmitters, volume correctors, etc., can be attached under official
supervision.

Before you connect additional mechanically driven equipment, you must make sure that
the direction of rotation and the rotation rate U
the data on the gas meter. The torque required for driving the additional equipment must
not exceed the value stated on the indicating plate of the drive shaft.

ø 25

ø 6

(see chapter 5 Specifications) comply with

a

H

35

9

M6

2

14,7

6

20,7

24,5

Figure 5: Dimensions of the drive shaft coupling

2.5.3 Connection of additional equipment

The drive shaft couplings of the meter head (type “G-D”) can be used for connecting
additional mechanical or electronic measuring instruments. In this case, the total driving
torque must not exceed the approved value. If no additional equipment is used, the drive
shaft couplings are sealed.

The rotation rates of the drive shaft coupling depend on the meter size (see table).

Manual TRZ 04 · EN04 · February, 1st 2017

36

Installation and Commissioning

Notice

Attention

Additional equipment or additional measuring instruments can only be
attached or removed under official supervision. Before you connect
additional equipment, make sure that the direction of rotation and the
rotation rate of mechanical transmission coincide. Depending on the
location for attaching additional equipment, you can turn the meter head into
the most favorable position for installation without damaging the locking
seals by loosening two hexagon socket screws.

General

You can turn the meter head through 355° without breaking a seal. It is not necessary to
loosen a locking screw, the meter head is held in position because the rotary mechanism
is stiff. The rotation thus requires a slight effort.

Encoder

Figure 6: Type “G” meter head

Notice

If work has to be done on the meter head, please make sure that the official
seals are not damaged.

Manual TRZ 04 · EN04 · February, 1st 2017

Installation and Commissioning

r

C

2.5.4 Pulse transmitters

The TRZ 04 and TRZ 04-K turbine meters provide different sensors which supply volume
pulses in a variety of frequency ranges. These pulses can be further processed by volume
correctors or remote totalizers, for example. All pulse transmitters of the TRZ 04 have
been approved for custody transfer metering. The connection options are shown in the
following illustration.

onnection options

Volume corrector

1

E

E

LF

4

ENCO

1

E

E

1

E

E

E

HF3-D HF2-D

3

E

12

E

E

1

non [Ex] [Ex]

D

A

Servo-actuator
Gas flow recorder
Remote totalizer
Printer
Maximum-value recorder

Volume corrector
Alarm system

Volume corrector

0-20 mA

(0-4 mA)

(4-20 mA)

Min./max.-contact
flow indicator

Volume corrector

1 Ex i isolating amplifier
2 Digital-to-analog converte
3 Blade monitoring system
4 Tamper contact

37

Danger

All pulse transmitters are intrinsically safe and must be connected
only to intrinsically safe circuits if they are used in areas subject to
explosion hazards.

The safety barriers must meet the requirements of the

Ex ia IIC

or

For the NF and tamper contact the cable shield should only be
connected on the supply side.

Manual TRZ 04 · EN04 · February, 1st 2017

Ex ib IIC

type of protection.

38

Installation and Commissioning

2.5.5 Pulse transmitters in the meter head (LF)

The meter heads of the RMG TRZ 04 and TRZ 04-K and turbine meters are fitted with two
reed contacts as standard. The pulse value corresponds to the rotation rate U

. See the

a

indicating plate on the meter head for exact frequency data. The guide values are given in
the tables on pages 33-34. The maximum pulse frequency is 0.3 Hz.

2.5.6 Pulse transmitters in the measuring element (HF 2-D and HF
3-D)

The higher-frequency flow signals from the HF 2-D and HF 3-D proximity sensors are used
for control purposes and in conjunction with electronic flow computers suitable for custody
transfer metering. In the case of the HF 3-D pulse transmitter, the pulses are picked off at
the turbine wheel, while they are picked off at the reference wheel for the HF 2-D pulse
transmitter. The two wheels are arranged in such a way that two pulse series of the same
frequency are generated which are out of phase by 180°. The exact frequency is
determined during meter proving and is stated on a supplementary data plate on the meter
case. The guide values are listed in the tables on pages 33-34. The maximum pulse
frequency is approx. 2100 Hz at Q

, but depends on the meter size.

max

2.5.7 Tamper contact

A tamper contact is located directly next to the two reed contacts in the meter head. If the
attempt is made to block the reed contacts with a magnet held on the meter head, this
contact switches.

In passive state this contact is closed.

2.5.8 Encoder

With the rotary encoder type ENCO 08 the absolute totalizer reading of the mechanical
index is acquired and transmitted as a data record to a volume corrector. The encoder is
energy self-sufficient, which means, no battery or external power supply is necessary for
the operation. The energy required for digital transmission of the totalizer reading is
provided by the connected auxiliary device (volume corrector).

Manual TRZ 04 · EN04 · February, 1st 2017

Installation and Commissioning

Danger

The encoder is approved for use in hazardous areas, the marking is
as follows:

II 2 G Ex ib IIC T6

Warning

Attention must be paid to the selection of cables to guarantee that the
permitted limits, in accordance with EC-type Examination Certificate of the
explosion protected equipment, are not exceeded.

Danger

The Ex-signal circuit is to be laid in its own cable. For the installation of the
encoder, a shielded cable may only be used (for example LIYCY 2 x 0.75 mm2,
coat color blue).

The cable shield has to be grounded at both sides. The earthing of the cable
shield is on the non-explosion protected site. At the other cable end is the
shield on the isolated mounted metallic ENCO 08 – housing.

Compliance with the regulations of DIN EN60079-14 the ENCO 08 housing can
grounded also in explosive areas.

The meter body of turbine and rotary meter and the aluminum housing of ENCO
08-M have to be grounded.

The fixed installation of the intrinsically safe cables is absolutely required.

39

You may find the connector pin assignments in the appendix Connector pin assignments
on page 57.

Manual TRZ 04 · EN04 · February, 1st 2017

40

Installation and Commissioning

2.6 Specifications of the pulse transmitters

Electrical data:
Reed-contact – Contact as make-contact element

max. switching voltage
max. switching current
max. conduct load
f

max

HF 2/HF 3 – proximity switch
Inductive proximity switch complying with DIN 19234 (NAMUR)

Supply voltage

current if switch is not operated
current if switch is operated
f

max

power

explosion protection acc. to
ATEX marking

ENCO 08 – Absolute Encoder

Supply voltage
Current
Power

Explosion protection acc. to
ATEX marking

20 V/DC
40 mA
200 mW
0,3 Hz

7 to 15 V DC
(with internal resistance Ri = 1 k)

 3 mA
 1 mA

2100 Hz
120 mW

II 1G Ex ia IIC T6

7 – 13,5 V DC
15 mA
51 mW

II 2G Ex ib IIC T6

Notice

The power rating in terms of the intrinsic safety, refer to the added
certificates (s. Annex)

Manual TRZ 04 · EN04 · February, 1st 2017

Installation and Commissioning

2.7 Temperature measurement

In order to measure the gas temperature, a resistance thermometer can be used in a
thermowell in a fitting downstream of the gas meter. It is recommended that a second
thermowell, e.g. for a monitoring thermometer, be used. If such thermowells are not
provided for in the meter case, temperature measurement must be performed at a
distance of up to 3 x DN or a maximum of 600 mm downstream of the turbine meter.

All turbine meters of types TRZ 04 from the nominal diameter of DN 80 (3") upwards can
be fitted with a thermowell for a PT100 resistance thermometer.
Due to their short size, turbine meters of type TRZ 04-K cannot be fitted with a thermowell.

Operating temperatures prevailing at outdoor metering stations in winter or at natural gas
metering stations downstream of regulating stations are usually in the range of -5C to
+10C. By comparison, higher operating temperatures prevail at metering stations located

downstream of compressor stations. For this reason, the measuring elements of the
temperature sensors located outside the gas line must be appropriately insulated against
the weather. In order to achieve optimum thermal conduction, oil as a heat transfer liquid
should be filled in the thermowells in any case.

41

2.8 Commissioning

2.8.1 Filling with oil

Notice

When the turbine meters are delivered, the lubricators do not contain any oil.
The oil pumps must not be filled with oil until they are at the installation site
prior to commissioning! A small bottle of oil is supplied with each gas meter.
Then you have to perform an initial lubrication.

For this see the detailed lubrication instructions in chapter 3.2 Lubrication.

2.8.2 Connecting the gas flow

Do not fill any downstream pipelines or station sections through the turbine
meter. This may speed up the turbine wheel and lead to excessively high
loads with resultant damage.

Warning

Manual TRZ 04 · EN04 · February, 1st 2017

Installation and Commissioning

Notice

42

Short-time overload operation of 20% above the maximum flow rate Q

max

is

permissible. Such load conditions should be avoided, however, since in
most cases they cannot be controlled and exceed the officially approved
limits for custody transfer metering. Moreover, such overloads reduce the
service life of the gas meter.

Warning

The gas flow must be free of foreign particles, dust or liquids. Otherwise it is
recommended that filters or separators be installed.

Danger

With the start-up of this device it is to be observed that all cables were correctly
laid and connected.

The housing must be completely closed.
With the connection and the start-up of the encoder, observe the guidelines of

the appropriate norms

 DIN EN 60079-0 and
 DIN EN 60079-14

Manual TRZ 04 · EN04 · February, 1st 2017

Operation

3 Operation

3.1 Influences on the error of measurement due to
operation

3.1.1 Intermittent operation

Rapid changes of the gas flow should be avoided, since the turbine wheel
can follow these changes only with a certain delay due to its inertia. In this
way, errors of measurement occur, in particular, if the gas flow is shut off.
Since in this case the turbine wheel slows down after the flow has stopped, a
gas volume is measured which is always higher than that which has actually
flowed through the gas meter.

Warning

3.1.2 Influence of pulsations

43

The gas flow must be free of shocks or pulsations. A gas metering station can be affected
by flow pulsations, however, if the following equipment has been installed upstream or
downstream in the system:



reciprocating piston compressors,



rotary displacement meters,



gas pressure regulators lacking steadiness of operation,



pipes where no gas flows (siphons).

Volume flow pulsation is the decisive quantity for evaluating the performance of gas
meters under the influence of pulsations. Volume flow pulsation is physically always
associated wit

h

pressure variations

.

The following relation is established in a first

approximation:

DN

Q

2

K





pQ

relrel

With:

^

Q

: is the relative volume flow pulsation (peak-to-peak)

rel

Q¯: is the mean volumetric flow
^

p

: is the relative pressure pulsation (peak-to-peak)

rel

DN: is the nominal diameter of the gas meter
K: is a constant depending on standard density, velocity of sound, compressibility,

pressure at base conditions, temperature, and station-specific parameters.

Manual TRZ 04 · EN04 · February, 1st 2017

44

Operation

With this relation, it is possible to estimate volume flow pulsation on the basis of pressure
pulsation, which can be measured more easily.

Direct measurement of volume flow pulsation is preferable, however, since the results are
more reliable. The crucial factor is the pulsation

at the location of measurement.

3.1.3 Consequences

Notice

In the case of pulsating flow, the turbine meter shows a measured value
which is too high.

Due to the pulse applied by the flow on the impeller which increases quadratically with the
flow velocity, the resultant rotational speed is higher than the mean value of the flow
velocity.

The influence with high gas density is less, but increases with a high mass moment of
inertia (heavy impeller) or fast-running wheels.

Warning

Furthermore,
High pulsation amplitudes may result in premature wear of shaft bearings
due to increased load.

3.1.4 Limiting values

Frequency ranges



It is generally unlikely that measured values will be distorted in the frequency range
above 100 Hz.



In practice, it is hardly possible to initiate any significant flow variations at such
frequencies.



Disturbances are to be expected most frequently in the frequency range between 0.1 Hz
and 100 Hz, since with typical station dimensions, the gas column can be expected to
produce resonances. Flow variations with a high relative amplitude may occur.



In the frequency range below 0.1 Hz, there is a quasi-steady flow which will not cause
any distortion with the gas meters.

Manual TRZ 04 · EN04 · February, 1st 2017

Operation

Pulsation amplitudes
Studies have shown that no disturbances are to be expected in the case of relative flow
pulsations below 5% (peak-to-peak) and relative pressure pulsations of less than

0.1% to 0.5% (peak-to-peak).

These data should be regarded as approximate values depending on the flow rate and
pulsation frequency involved.

45

Manual TRZ 04 · EN04 · February, 1st 2017

46

Operation

3.2 Lubrication

3.2.1 Lubricator

For lubrication permanently fitted oil pressure pumps are used. The various designs are
given in the tables below.

KO

GO

DS

DN PN 10, 16

50 DS (KO) KO DS (KO) KO

80 DS (KO) KO DS (KO) KO
100 DS (KO) KO DS (KO) KO
150 DS (KO) KO DS (KO) KO
200 KO KO

Types in brackets are options

3.2.2 Specification for lubricating oils

Type of oil pump Container volume Delivered quantity

Pushbutton pump
Lever pump
Permanent lubrication -- --

TRZ 04-K TRZ 04

Pressure classes Pressure classes

PN 25, 40, 64, 100

ANSI 150

ANSI 300, 600

8 cm3 0.114 cm3/stroke

150 cm3 1.5 cm3/stroke

PN 10, 16

ANSI 150

PN 25, 40, 64, 100

ANSI 300, 600

Notice

For lubrication purposes, we recommend that you use only
Shell Tellus S2 MA 10 or another lubricating oil with 2 to 4°E at 25°C in order
to avoid damage to the shaft bearings. You can order your supply of
lubricating oil from us in 1-liter containers under Ref. No. 82.11.148.00.

Shelf life of oil:

The shelf life depends on the operating conditions (e.g. UV light, humidity ..).
In principle the oil suffers no quality loss during the first 3-4 years.

Manual TRZ 04 · EN04 · February, 1st 2017

Operation

3.2.3 Initial lubrication

When the turbine meters are delivered, the lubricators do not contain any oil. The oil pumps
must not be filled with oil until they are at the installation site prior to commissioning. A small
bottle of oil is supplied with each gas meter.

For the initial lubrication more pump strokes are necessary than for the relubrications because
first the oil pipes have to be filled with oil.

Pump DN 50 – DN 200 DN 250 – DN 600

KO (pushbutton pump) 40 strokes 45 strokes

GO (lever pump) - 10 strokes

3.2.4 Relubrication

Notice

The relubrication intervals are stated on an indicating plate on the meter
case. See also “Lubrication procedure”.

47

Example:

Relubrication!
Every 3 months 2 strokes
Lubricating oil: 2-4°E at 25°C
see operating instructions

Notice

In the case of unfavorable operating conditions, such as condensate forming
because of water or hydrocarbon, or dust-laden gas, or service temperatures
above 50°C, we recommend that lubrication be performed at shorter
intervals, even daily under extreme conditions (permanent formation of
condensate).

If the gas meter is operated under the above-mentioned conditions, it is
likely that its service life will be reduced. If you have questions to the
relubrication in such cases please contact RMG.

Manual TRZ 04 · EN04 · February, 1st 2017

48

Operation

3.2.5 Lubrication procedure

To fill the pumps and lubricate the turbine meters, proceed as follows:

Pushbutton pump (KO)

To fill with oil

 Unscrew cover.
 Fill with oil.

 Screw on cover again.

To lubricate up to 50 bar

 Unscrew knurled cover (screwed all the way to

the pump casing when delivered)

 Press pushbutton, which is now visible, once

for each stroke (delivered quantity: 0,114
cm3/stroke)

 Screw on knurled cover again. Make sure you

stop screwing as soon as you can feel a
resistance and leave a gap.

To lubricate over 50 bar

 Loosen the knurled cover (screwed all the way

to the pump casing when delivered)

 Screw on the pushbutton tightly, once for each

stroke (delivered quantity: 0,114 cm3/stroke)

 Screw on knurled cover again. Make sure you

stop screwing as soon as you can feel a
resistance and leave a gap.

Every 3 months 6 strokes

Manual TRZ 04 · EN04 · February, 1st 2017

Operation

3.2.6 Maintenance

RMG turbine meters are maintenance-free except that they require lubrication at regular
intervals. Since all gas meters fitted with oil pumps are shipped with an empty oil storage
tank, it is absolutely essential to fill the storage tank of the oil pump with oil and perform
the initial lubrication before the gas meter is put into service (see section “Lubrication”).

The operator should nevertheless check the turbine meter at regular intervals. In this
connection, please refer also to DVGW code of practice G 495 (Gas pressure regulators
for monitoring and servicing large-scale gas metering systems).

The gas meter should be checked for accuracy approximately every two years depending
on whether it is possible or necessary to perform such checks. This can be done as
follows:

 In the station itself by connecting two gas meters in series.
 In an officially acknowledged testing laboratory for gas measuring instruments.
 In the factory.

49

Manual TRZ 04 · EN04 · February, 1st 2017

50

Labelling

4 Labelling

All important data which are necessary for operating the gas meter are stated on the
plates which are affixed to the meter case, totalizer or pulse transmitters.

Main data plate of the TRZ 04 turbine

DN

Q

t

Q

max

Q

min

by Honeywell

PS

m³/h

p

m³/h

TS
G

m³/h

LF reed 1m =

EN 12261 / AC 1,0

3

MXX

bar

TRZ 04

bar

No.

°C

Year

pulses

0102, 0091

t =-25°C...+55°C (TC2)

am

T10417

m

³

4

LF

1. reed 1

2. reed 2

3. control

PIN 1+4
PIN 3+6
PIN 2+5

2

1

1

7

3

8

5

6

Encoder

2

1

4

1. EZD-prot.+

3

2. EZD-prot.-

3. ground

PIN 1
PIN 3
PIN 4

meter with type “G” meter head

TS: Permissible temperature range for meter case

(PED 2014/68/EU)

PS: Maximum permissible pressure for meter case

(PED 2014/68/EU)

t

: Permissible temperature range for custody

am

transfer metering (MID)

Built-in pulse transmitters,
type “G” meter head
Pin 7 are 8 are not connected.

Built-in encoder
with type “G” meter head
Pin 2 is not connected.

Re - Lubrication

At 3 month intervals, 2 strokes.
Lubricant: 2-4°E at 25°C
Supplementary information
see operating instructions.

Indicating plate for relubrication of the
main bearings

Manual TRZ 04 · EN04 · February, 1st 2017

Re- Lubrication

At 3 month intervals, 6 strokes.

Lubricant: 2 - 4°E at 25°C

The containervolume of 0,15 litre is

sufficient for 3 months. Supplementary

information see operating instructions.

Labelling

Indicating plate for relubrication of the
main bearings

p

m

Arrow indicating the direction of flow

Indication of the reference pressure tap

51

Manual TRZ 04 · EN04 · February, 1st 2017

52

Specifications

5 Specifications

5.1 Meas. ranges/Dimensions/Pressure classes of the
TRZ 04

U

DN Size Measuring range

mm Q

in

Q

min

m3/h m3/h m3/h m3

Qt mm

max

DN Pressure classes/ Approx. weight. Dimensions

a

in PN kg ANSI kg L H C

50

80

100

150

200

G 65 5 100

2"

G 100 8 160 32 1
G 160 13 250 50 1 25/40 25 300 25 240 230 96

3"

G 250 20 400 80 1 600 36

G 160 13 250 50 1
G 250 20 400 80 1 25/40 32 300 35 300 260 120

4"

G 400 32 650 130 1 600 55 270

G 400 32 650 130 1
G 650 50 1000 200 1 25/40 60 300 65 450 265 180

6"

G 1000 80 1600 320 10 600 100 285

8"

G 1000
G 1600

80

130

1600
2500

20

320
500

0,1

10
10

50

2"

80

3"

100

4"

150

6"

200

8"

10/16 13 150 13
25/40 21 300 13 150 210 60

600 21

10/16 20 150 20

10/16 25 150 30 240

10/16 50 150 50 265

10/16 75 150 100 300
25/40 95 300 120 600 320 240

64 150 600 160 320

PN pressure classes complying with DIN EN 1092,
ANSI pressure classes complying with B16.5.

Turbine meters for all pressure ranges and pipe
sizes can be equipped with a thermowell to
accommodate a resistance thermometer.

Manual TRZ 04 · EN04 · February, 1st 2017

Specifications

5.2 Meas. ranges/Dimensions/Pressure classes of
TRZ 04-K

Nominal Meas. range

dia / DN Qmin-Qmax

mm in

50 2“ 6-100 0,1 PN 10, 16, 25, 40

80 3“ 13-160

100 4“ 25-400

150 6“ 40-650

200 8“ 100-1600

m3/h m3

16-250

(25-400)

(40-650)

65-1000

(100-1600)

160-2500

Ua

1 PN 10, 16, 25, 40

1 PN 10, 16, 25, 40

1 PN 10, 16, 25, 40

10 PN 10, 16, 25, 40

Pressure

classes

ANSI 150, 300

ANSI 150

ANSI 150

ANSI 150

ANSI 150

L H Weight Case design

mm mm App. kg

150 212 10

120 245 14

150 255 25

175 285 40

200 305 60

Flanschausführung

L

On request you may get meters for other pressure ranges and other flange types as well.

5.3 Q

depending on the operating pressure in

min

natural gas

53

H

Values for custody transfer metering, according to MID approval

DN G Q

50 65 100 5 5* 4
80 100 160 8 5 15 3,2 50

160 250 13 8 3 5 10 3,2 50
250 400 20 13 3 8 10 5 25

100 160 250 13 8 3 5 25

250 400 20 13 3 8 10 5 25
400 650 32 20 3 13 4 8 10 6,5 15 5 25

150 400 650 32 20 3 13 10 8 25 6,5 40

650 1000 50 32 3 20 4 13 10 10 15 8 25
1000 1600 80 50 3 32 4 20 10 16 15 13 25 10 40

200 1000 1600 80 50 3 32 4 20 10 16 15 13 25 10 40

1600 2500 130 80 3 50 4 32 10 25 15 20 25 16 40

*: measuring range 1:20

max

[m³/h]

Q

min,LP

[m³/h]

Q

[m³/h] / p

min

Minimum flow rate for natural gas with corresponding minimum pressure

MB 1:30 MB 1:50 MB 1:80 MB 1:100 MB 1:120 MB 1:160

Q

minpminQminpminQminpmin

[barg]:

min

Q

minpmin

Q

minpminQminpmin

Manual TRZ 04 · EN04 · February, 1st 2017

Specifications

54

To get the Q

min, HP

value for other gas types you can calculate it using the formula in

chapter 1.8.1 Extension of the measuring range or you can contact RMG.

5.4 Values for 2nd metering or meters without MID
approval

Q

G

max

m³/h

Q
m³/h

65 100
100 160
160 250 13 7 6 4 4 3 3 2 2 2
250 400 20 11 8 6 6 5 4 4 3 2
400 650 32 18 13 10 9 7 6 6 5 4
650 1000 50 28 20 16 14 11 10 9 8 6

1000 1600 80 44 31 26 22 18 16 14 13 10
1600 2500 130 72 51 42 36 29 26 23 21 16

1)

LP standard measuring ranges 1:20 and 1:30 (on request)

2)

Measuring range 1:10

It depends on national laws whether these measuring ranges are applicable for custody
transfer metering.

To get the Q

min, HP

value for other gas types you can calculate it using the formula in

chapter 1.8.1 Extension of the measuring range or you can contact RMG.

min,LP

2)

10

2)

16

1)

Q

min,HP – natural gas

m³/h

Operating pressure in bar

a

5 10 15 20 30 40 50 60 100
5 4 3 3 2 2 2 2 1
7 6 4 4 3 3 2 2 2

Manual TRZ 04 · EN04 · February, 1st 2017

5.5 Overview of the materials used

Designation Material

Meter case Spheroidal graphite iron, cast steel or welded

steel
Flow straightener Delrin, aluminum or steel
Turbine wheel Delrin or aluminum
Measuring element case Aluminum
Measuring element bea-

rings
Ball bearings Stainless steel
Shafts Stainless steel
Gearing Stainless steel or plastic
Magnetic coupling Stainless steel
Meter head cap Plastic or aluminum
Totalizer Plastic

Aluminum and/or stainless steel

Specifications

55

Manual TRZ 04 · EN04 · February, 1st 2017

56

Annex

Annex

Certificate for LF-, HF-sensors and Encoder

Table of used sensors

Pulse

Generators

LF­sensor

(LF)

HF­sensor

(HF2-D and
HF3-D)

ENCO 08

Inductive proximity

Electronic encoder

Type

Reed contakt:

PMC-1401

switch:NF503A

type ENCO 08

Type approval to PED 2014/68/EU

EC-type examination

certificate according to

directive 94/9/EG

Ex Schutz Gutachten

vom 06. Juni 2013

PTB 01 ATEX 2192

IECEx PTB 08.0058

II 1 G Ex ia IIC T5

BVS 15 ATEX E 041 X

II 2G Ex ib IIC T6

Producer Annex

PIC GmbH
D-90530
Wendelstein

Germany
IFM electronic
D-45127
Essen
Germany
RMG
Messtechnik
D-35510
Butzbach
Germany

A

(1 page)

B

(8 pages)

C

(2 pages)

Flow straightener

Meter head with mechanical
index, Encoder and LF pulse
transmitters

Turbine wheel

Reference wheel

HF pulse transmitters

Figure 7: Sectional drawing of a turbine meter.

Manual TRZ 04 · EN04 · February, 1st 2017

Annex

Connector pin assignments

On the rear side of the meter head there are two sockets for Binder plugs of series 713.
The left one (optional) for connection of the encoder, the right one for the LF pulses. The
figure shows the view on the plugging side of the sockets.

Contact ENCO 08 LF / tamper HF 2-D / HF 3-D

3

4

4

3

1

2

5

6

8

7

12

3

2

4

1

1 Vo + LF 1 HF +
2 - tamper contact ­3 Vo - LF 2 HF ­4 PE LF 1 not connected
5 tamper contact
6 LF 2
7 not connected
8 not connected

Cable diameter for HF 2-D, HF 3-D and ENCO 08: 6-8 mm.

57

Manual TRZ 04 · EN04 · February, 1st 2017