RMG EC 24, EC 21 Operating Instructions Manual

l

Volume Corrector EC 24 and
Temperature Corrector EC 21

OPERATING INSTRUCTIONS

Serving the Gas
Industry Worldwide

STATUS FEBRUARY 2015

by Honeywel

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Note:

Unfortunately, paperwork does not automatically update itself but technical developments are
constantly being made. Therefore, we reserve the right to change the descriptions and statements
contained in our operating instructions without prior notice. However, you can conveniently
download the most recent version of this manual (and those of other devices) from our website

www.rmg.com.

RMG Messtechnik GmbH

Otto-Hahn-Str. 5 Phone numbers:
35510 Butzbach (Germany) Switchboard: [phone]
Fax: [phone] Customer Service: [phone]
E-mail: [e-mail] Spare Parts: [phone]

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CONTENTS

INTRODUCTION ................................................................................... 1

General information .............................................................................................. 1

Design variants .............................................................................................................. 1

The coordinate system .................................................................................................. 2

The display field............................................................................................................. 2

The system ............................................................................................................ 2

Program memory ........................................................................................................... 2

Reset ............................................................................................................................. 2

Booting .......................................................................................................................... 3

OPERATING MODES ............................................................................ 4

SAFETY INSTRUCTIONS ...................................................................... 5

Operating instructions for the installer ................................................................ 6

INSTALLATION .................................................................................... 8

Electrical connections .......................................................................................... 8

Installing the remote totalizer ............................................................................ 12

OPERATION ....................................................................................... 13

Front panel and keyboard of the EC 24 ............................................................. 13

Display ................................................................................................................. 14

Programming ....................................................................................................... 15

Parameters and modes of the EC 21 / EC 24 .................................................... 18

Coordinate system .............................................................................................. 20

Description of individual columns ...................................................................... 21

Column structure ........................................................................................................ 21

Totalizers ..................................................................................................................... 22

Flow rate ..................................................................................................................... 22

Pressure ...................................................................................................................... 22

Temperature ................................................................................................................ 23

Analysis ....................................................................................................................... 23

Outputs ....................................................................................................................... 23

Error / ID .................................................................................................................... 24

Mode / Memory .......................................................................................................... 24

Operating modes ......................................................................................................... 25

Error messages ........................................................................................................... 27

Changing the batteries (EC 24) .......................................................................... 28

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CONTENTS

ANNEXES ........................................................................................... 29

A Equations used with the EC 21 temperature corrector and

the EC 24 volume corrector ......................................................................... 29

B Block diagram for the EC 21 / EC 24 ........................................................... 31

C Specifications ................................................................................................ 32

D Examples of connection (EC 21 and EC 24) ................................................. 38

E Instructions for the measuring element of the turbine meter .................... 40

F Dimensions .................................................................................................... 44

G EC type approval certificate ......................................................................... 45

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INTRODUCTION

Introduction

General information

Design variants

The EC 21 temperature corrector (correction is made via the temperature measured and a fixed
pressure value) or the EC 24 volume corrector (correction is performed using measured pressure
and temperature values) can be used as a unit together with electronic turbine meters from RMG or
separately with any mechanical turbine or rotary displacement meters.

The following device types are available:

1

Device type TERZ 94 TRZ 03 TE

TRZ 03 TEL

Measuring
element (meter)

Function Vm totalizer Vm totalizer Vm totalizer and

Case

Inputs Wiegand (1 or 2

Pulse comparison No Yes Optional Optional No

Pulse outputs LF, HF LF, HF LF, HF LF, HF LF

electronic electronic electronic electronic mechanical

Wiegand (1 or 2

channels)

channels)

EC 21 EC 24 EC 24

Vm totalizer and
volume
correction (T)

Wiegand (1 or 2
channels)

volume

correction (p,T)

Wiegand (1 or 2

channels)

(pulse input)

Vm totalizer and
volume
correction (p,T)

Reed (1 channel)

There are various hardware configurations for the device types listed:

 without current output: Mother board
 with current output (4 to 20 mA): S board

and additional boards for:

 pulse comparison (not available for the TERZ 94)
 RS 485 interface (for Modbus)
 memory submodule with clock

If the corrector is used together with an electronic RMG turbine meter, please observe the
instructions for the measuring element in the annex to this manual!

The operating concept

The operating concept has been chosen in such a way that the operator can easily use the device
without wasting too much time reading a manual.

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INTRODUCTION

The coordinate system

A coordinate system makes it easy for the operator to access all configuration data as well as
measured and calculated values by means of a table. The coordinate system is based on 8
columns. Every value in this coordinate system can be reached by pressing the appropriate cursor
keys (arrows “►“ “▼“).

2

The display field

An alphanumeric single-line display with 12 characters enables data and measured values to be
indicated together with their abbreviated designations and units. The LCD has been designed in
such a manner that it is particularly suitable for battery-powered mode. At temperatures below ­20°C or exceeding +60°C, the display may be impaired.

The system

A complete Flow Computer System has been developed on the surface of a few square centimetres
using the most advanced SMD technology with large-scale integrated components. Several device
functions, such as pulse counting, frequency measurement, keyboard controller and dispatcher
output, have been incorporated into a controller. Thanks to large-scale integrated components,
fewer chips are required and this also contributes to making the device reliable. The type of the
individual device essentially depends on the software used.

Program memory

The program memory of the base device is located in a flash memory on the main board, whereas
the data memory is located on an additional board.

Reset

In the case of a reset, the power supply is disrupted and the corrector is switched off during this
period of time. In this way, the program and the operating parameters will not be lost and also the
meter readings will be retained. A reset is made on the EC 21 / 24 by switching off not only the
battery but also a possibly available external power supply.

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INTRODUCTION

Booting

In case of serious disturbances it may be necessary to reboot the device.

With the booting all parameter settings and totalizer readings are lost! Therefore read out all
parameters of the EC 21 / EC 24 before booting.

To reboot the device proceed as follows:

 For mains supplied devices switch off the power supply.
 For battery powered devices disconnect the battery (see section "Changing the battery"). Also a

possibly existing backup battery for mains supplied devices must be disconnected.

 Press the "P" key and keep it pressed.
 Connect the battery again and/or switch on the power supply again.
 Now the text "del all" appears in the display. Press the



-key (Enter).

 As soon as the addresses are counted up in the display, you can release the "P" key.
 The booting procedure has finished, if the totalizer is displayed (now set to 0).

Now transfer all device parameters back to the EC 21 / EC 24 or enter the values from the
calibration certificate.

3

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OPERATING MODES

Operating Modes

Battery-powered device

The EC 21 is fitted with an exchangeable battery and the EC 24 is fitted with two exchangeable
batteries. Both devices have been designed for a continuous operation over approx. six years. This,
however, is conditional on the device being either read or “woken up” by pressing the external

4

button once a week.

Battery-powered device with an external power supply

If an interface submodule is used for transmitting data, such as the externally supplied RS 485, the
service life of the battery is more than 10 years.

Externally supplied device with built-in standard battery

In the case of an external power supply (current transmitter which serves as a power supply and 4
to 20 mA current output at the same time), the EC 21 / EC 24 is completely supplied via a current
loop. For this purpose, a power supply unit is required which is to be connected to this output.
In the case of the EC 24 volume corrector, pulse processing is even ensured in the event of a power
failure of the current loop.
If pulse processing is to be maintained with the EC 21 even in the case of a power failure of the
current loop, a standby battery (available as an option) can be installed which will bridge the power
supply during a period of up to six months.

Display of battery change

Lithium batteries retain their voltage until they are almost completely discharged so that the
voltage cannot be monitored with an appropriate display until the next battery change is necessary.

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SAFETY INSTRUCTIONS

Safety Instructions

The EC 21 and the EC 24 comply with currently applicable standards and regulations. However,
failure to operate them properly may cause hazards.

Persons who install or operate a volume corrector in areas subject to explosion hazards, must be
familiar with the currently applicable explosion protection standards and regulations.

Do not change anything of the volume corrector on your own, otherwise the approval will become
invalid.

Operate the volume corrector only in the specified temperature range from -20°C to +60°C.

The electronic corrector system of the explosion-protected design has been approved for use in
areas subject to explosion hazards and its code is:

II 2 G Ex ib[ib] IIC T3/T4

You can find the EC type approval certificate in the annex and its reference number is:

5

TÜV 02 ATEX 1970

Please observe the following signs:

Danger of explosion

In the manual, this symbol warns you of an explosion hazard. Please observe the
instructions given next to this symbol. As to the danger of explosion, please note the
following in particular:

 Only the explosion-protected design of the EC 21 / EC 24 may be used in areas

subject to explosion hazards. Connect the pulse outputs of these devices only to
intrinsically safe circuits.

 The battery must be changed in an area without explosion hazards.
 The specifications on cable type and cable length in this manual and in the ex-

approval must be observed.

 Modifications to the device make the Ex approval invalid and are therefore prohibited.

Damage to property

In the manual, this symbol warns you of possible damage to property. The instructions
given next to this symbol inform you about what you can do to avoid damage to the
EC 21 / EC 24 volume corrector.

It is essential to observe the warning information in these operating instructions and the generally
applicable safety rules.
No warranty claims can be asserted if there is unauthorized interference with the device!

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SAFETY INSTRUCTIONS

Operating instructions for the installer

Identification:

Type: EC 21* / EC 24*
II 2 G Ex ib[ib] IIC T3/T4
TÜV 02 ATEX 1970

6

Manufacturer: RMG Messtechnik GmbH

Otto – Hahn – Straße 5
D-35510 Butzbach

Application:

Temp.= -20°C....+40°C and/or +60°C

Data see EC type approval certificate
Year of construction: 2004
Serial number: xxxx xx
0032

The device EC 21*/EC 24* is equipment for hazardous area.

Assembly/disassembly:

When assembling it is to be made sure that the degree of protection of the case is kept.
A direct exposure to sun must be avoided.
In case of disassembly the signal circuits are to be switched to zero potential and the
corresponding cables are to be removed.

Installation:

If one or more circuits are used, it is to be made sure with the cable selection that the
permissible limiting values according to the EC type approval certificate are not exceeded.
Each Ex signal circuit is to be run in its own cable, which has to be lead through the
appropriate PG cable gland.
A fixed laying of the intrinsically safe cables is obligatory.
The connecting cables are to be provided with core-end sleeves.

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SAFETY INSTRUCTIONS

Start-up:

With the start-up of this device it is to be made sure that all cables in the clamp area are
correctly connected and run.
The case must be completely closed.
With the installation and start-up the standard EN60079-14 is to be observed.
The device may be started up only by persons after training.

7

Settings:

The basic setting of the device takes place by RMG Messtechnik.
Changes of the basic setting may only be carried out by persons after training and/or
instruction.

Maintenance:

The battery changes may only take place in a safe area.
Repairs at this device may be carried out by RMG Messtechnik only.

Safety instructions:

The manual must be accessible to all persons, who are authorized with the operation of the
device.
No arbitrary changes may be made at the device, since otherwise the [ATEX] approval
becomes invalid.
The device may be never opened by force.
The warning references in this manual and the generally accepted safety rules must be
observed.

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)

INSTALLATION

Installation

Electrical connections

To reach the electrical connections, you must first remove the cover of the corrector.

8

Plug X2_0
for TERZ94trm
current module
and supply

Terminal block X4
Pulse outputs

Terminal block X15
Data interface

Jumpers

Plug X3
service module

1
2
3
4
5
6

1
2
3
4

Pin connector for button on
the

case

Plug X16_0,
TERZ94p pressure sensor

Reset(soldering pads

Terminals X5
Pulse inputs

Plug X6_0
EZSENS01

Terminals X9
PT-1000 sensor

Sockets X151 and X152
to accommodate an interface

Configuration of pulse inputs X_S1 and X_S2 for
terminals or the EZSENS01 board

You must select the sensor inputs before you connect the cables. To do this, install the jumpers
XS1 / XS2 and XTERZ90 on the board as indicated (see inputs and outputs in the annex).

Make your settings for input X5 by the X_S1 (for sensor 1), X_S2 (for sensor 2) and X_TERZ90
(additional for remote totalizer) jumpers as follows:

Reed contact Wiegand Remote totalizer
X_S1, X_S2 X_S1, X_S2 X_S1, X_S2 X_TERZ90
Jumpers 1-3 and 2-4 Jumpers 3-5 and 4-6 Jumper 3-4 Jumpers 1-2 and 3-4

Controlling the start-stop totalizer or resetting the resettable totalizer (depending on the
programming of the electronic totalizing unit) is performed through input X5 terminals 1 and 2.
As soon as input X5 terminals 1 / 2 has been short-circuited through an external contact,
interruption or resetting is performed.
 For this purpose, set jumpers at the positions identified with X_S2 to the “reed contact” function.

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INSTALLATION

For devices with current output:

Before commissioning, the device
must be activated.
The jumper must be plugged as
shown in the drawing.

deactivated activated

9

In the case of the EC 21 / EC 24, terminal X22 (on TERZ94trm current module which is plugged in
the main card) is used as current-loop connection to supply the device and as output current (4­20 mA).

To connect cables to the spring terminals, you need a screwdriver with a blade width of a maximum
of 2.5 mm. Introduce the blade into the intended slot and press down the screwdriver to open the
spring terminal.

Standard connection pulse outputs: 7-pin connector (Binder series 692)

3

2

4

5

1 - / 4 + LF signal (Vm or Vb)
2 - / 5 + Fault
3 - / 6 + HF signal

1

6

(view on device)

PE (screening)

Standard connection interface: 7-pin connector (Binder series 423)

3

2

1

4

6

5

1 - / 4 + RS485 supply
3 - / 5 + RS485 data line
2, 6 Spare
(view on device)

In areas subject to explosion hazards, the EC 21 / EC 24 must only be connected to
certified intrinsically safe circuits.
Make sure that the limit values specified in the certificate of conformity (see annex) for
the devices to be connected are not exceeded.

The maximum voltage which may be connected to the RS 485 interface is 10.5 V. A
higher voltage causes damage of the device.

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INSTALLATION

If one or more than one circuit is used, make sure that the permissible limit values in accordance
with the EC type approval certificate are not exceeded.
Each intrinsically safe signal circuit must be installed in a separate cable which is to be taken
through an appropriate high-strength cable gland.
It is absolutely imparative that the intrinsically safe cables are permanently installed.
Make sure that the connecting cables are provided with core-end sleeves.

10

Earthing

To prevent measuring errors caused by electromagnetic interference, you must not fail to earth the
case of the meter head via the earthing screw on the left side of the case.

Calibration switch

Minimum cable cross section:

Up to a length of 10 m: 6 mm2

2

From a length of 10 m: 10 mm

Earthing screw

Cables

Use 2-core or multicore shielded cables which are twisted together in pairs (type LIYCY) for the
signal lines (LF output, HF output, current-loop connection, control input).
Use 4-core shielded cables which are twisted together in pairs (type LIYCY) for the data lines (RS

485).
The shielding must always be connected to earth on both sides. In the case of the EC 21 / EC 24 ,
you must proceed as described under “Cable glands”.

We recommend that cable cross sections of 0.5 mm2 are used. Due to the cable gland, the outside
diameter must be between 4.5 mm and 6.5 mm.

If the device is used in areas subject to explosion hazards, the maximum cable length is limited by
the limit values for intrinsically safe circuits and depends on the inductance and capacitance of the
cable!

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INSTALLATION

Cable glands

Clamp the shielding on both sides, as shown in the picture below, into the cable glands located on
the outside of the case:

 Unscrew the cap nut.
 Pull out the plastic clamping piece.
 Push the cable end through the cap nut and the clamping piece and bend the shielding

backwards.

 Put the clamping piece back into the connecting piece.

11

 Screw on the cap nut again.

Cap nut

Clamping piece

O-ring

Connecting piece

Permissible temperature ranges

For the standard design, the following fluid temperature and ambient temperature ranges are
permitted:

Fluid temperature range: -20°C to +60°C
Ambient temperature range: -20°C to +60°C or 40°C

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INSTALLATION

Installing the remote totalizer

12

X1

TERZ94trm

Impulsausgänge

X4

Datenschnittstelle

X151

Datenschnittstelle

X15

4

321

X_TERZ90

Servicemodul

X2_0

V12

C1

V13
V14

TP-GND

XLP1

Boot

EZD/RS-485

X_S1

X152

26

S3 S1 S2 S4

P

X3

Tas ter

Reed 1+3 / 2+4

Sensorverstärker 3+4

Wiegand 3+5 / 4+6

X_S2

531

TERZ94p

C21

TEMP_LM7X

531

RESET

X10-0

X7

Q1

C22

EZSENS01

X16_0

CX1

6
X

C

Impulseingang

+

­+

X5

-

X6_0

PT1000

L1

CX3

CX2

Sensor

-

-

+

Sensor

+

Zählwerk

Index Input

Zählwerk

-

Index Input

+

Sensor

-

-

Zählwerk

+

Index Input

+

+

Sensor

Zählwerk

-

Index Input

X9

4
1

6
3

5
2

Non Ex

If your model is designed for remote totalizing, you can install the totalizer at a distance of up to
3 m from the meter case. Usually, the cable has already been connected to the sensor and the
totalizing unit when the device is delivered. Should this not be the case, you will have to connect
the connecting cable to input X5, terminals S1+ and S1- of the board. If you have a 2-channel meter
connect the second sensor to the clamps S2+ and S2-. Use only shielded cables of the type:
LIYCY - 2 x 0.75 blue (1-channel Ex)
LIYCY - 2 x 2 x 0.75 blue (2-channel Ex or 1-channel Non-Ex)
LIYCY - 3 x 2 x 0.75 blue (2-channel Non-Ex)
Maximum cable length: 3 m (installation with longer cable only on request)

In hazardous areas the temperature transmitter must not be connected via the
socket on the meter case. In this case it is prescribed to lay a separate cable for the
temperature transmitter!

In addition, check the plug-in jumpers XS1 / XS2 and XTERZ90 on the board (see inputs and
outputs in the annex).

Make your settings of XS1 and XS2 as follows: jumpers 3-4.

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OPERATION

Operation

Front panel and keyboard of the EC 24

Keyboard Designation Effect

Arrow Down

Arrow Right

 Moves downwards within a list:

Moves from the first value of the list towards the last value.

 Moves to the right towards another list:

Moves from the first list towards the last list.

VOLUME CORRECTOR

EC 24

00123456

.

V

V

3

3

bara

m

m/h

Ser.-No.

Year

Current output 4-20mA yes no

0085
0032

MESSTECHNIK GMBH

Germany

Zu

I

Further data
press buttons

II2G

-20°C +60°C/40°C

!

o

mA

EEx ib ia IIC T3/T4
TÜV 02 ATEX1970

T°CP

EG-type examination certificate

Nm3

Error

Typ

T

a

13

Out

IP65

+

Function

 Press both buttons at the same time to initiate the following

functions:

 Hold down >2 sec.: Segment test
 Hold down < 2 sec.: The coordinate will be displayed.

If the EC 21 / EC 24 is operated together with the measuring element of an electronic turbine
meter, the EC 21 / EC 24 contains the totalizing unit of the meter and the data plate of the meter is
located on the left side of the front panel.

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OPERATION

Display

In normal operating mode, the main totalizer is displayed.
If you press the external control buttons, you can select the other display values. After an
adjustable time has elapsed, the EC 21 / EC 24 will return to displaying the main totalizer.

If the display of the EC 21 / EC 24 does not show anything, the device is in energy-saving mode. In

14

this mode, the display is completely switched off. However, incoming pulses are processed and the
outputs are set. If you press one of the two control buttons, the display value will appear again.

Display
switched off:

Pointer position 1 0 0 0 0 5 8 3 1 m3 Main totalizer V

Pointer position 2 1 0. 0 0 0 m3/h Flow rate V·

Pointer position 3 1. 0 0 0 0 0 0 0 bara Pressure P

Pointer position 4 20. 0 0 0 0 0 0 °C Temperature T

Pointer position 5 1 -- Conversion factor C (analysis)

Pointer position 6 16. 0 0 0 0 0 0 mA Current Io

Pointer position 7 1 -- Error / ID

Pointer position 8 1 -- Mode / Memory

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-

OPERATION

Programming

Via the programming keys

For programming the EC 21 / EC 24, there are four buttons on the rear side of the board. The
official parameters are protected by a calibration switch and a password.

Via the programming module

Instead of using to the programming keys, you can program the device using the programming
module. The programming module is to be connected via a pin connector (see the picture below).

X9

X6_0

Impulseingang

Q1

RESET

C21

X4

X5

C22

C1

TP-GND

V12

V13

V14

Datenschnittstelle

6

X

C

X16_0

P

X1

Taster

X3

X7

TERZ94p

X2_0

Servicemodul

TERZ94trm

Impulsausgänge

CX2

PT1000

L1

CX3
CX1

EZSENS01

X10-0

TEMP_LM7X

5
31

Wiegand 3+5 / 4+6

X_S2

Sensorverstärker 3+4
Reed 1+3 / 2+4

5
31

Boot

XLP1

EZD/RS-485

X151

X_S1

26

X152

P

S3 S1 S2 S4

Datenschnittstelle

2

1
3

4

X_TERZ90

X15





+

P

15

Programming
module

Programming
keys

Programming with the programming module is to be performed in the same way as with the internal
buttons.

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OPERATION

The external and internal buttons correspond to each other in the following way:

Int. button Ext. button Meaning

16

P P

Display mode:

Switch over to programming mode.
(Press the button longer than 2 seconds.)

Programming mode:

Put the decimal point at the current position.

+



In display mode:

Move to the right within the matrix
(change of column).

In programming mode:

- Increase the decimal by 1.

- Scroll in the list.

(Display value is identified by “L“.)

-



In display mode:

Move towards the bottom
(change of line).

In programming mode:

- Decrease the decimal by 1.

- Scroll in the list.

(Display value is identified by “L“.)









In display mode:

Short-term view of the coordinate (e.g. A01)

In programming mode:

Go to the right by one decimal place
(if the last decimal has been reached:

Quit programming mode).

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OPERATION

Principle of programming

For programming, you must always proceed as follows:

 First change over to the display value to be modified.

 To do this, press either the control button (only forwards)

 or the internal buttons “+” and “-” or the external buttons “” and “” (forwards and

backwards).

 Change to programming mode by pressing “P” for at least 2 seconds. On the left side of the

17

display, a flashing character or cursor will appear:

Flashing character

0 1 2 3.2 3 P/m3

 You can now modify the flashing decimal by pressing either “+” or “” (+1) or “-” or “” (-1).

Example: If you press the ““ button three times, the first decimal will be increased from 0 to 3.
If an “L” appears on the far left side of the display, this value is a list. With a list, you can only
scroll in the specified values.



 After you have completed your programming of the first decimal, press “

character will start to flash.
Now proceed with your programming until you have reached the last decimal place.

 Then press “



” once again to have the set value accepted and quit programming mode.

 Press the “P“ button to set the decimal point behind the flashing digit.

With totalizers, modes and integers, no decimal point is permitted.

 Press the control button if you have made an error or if you want to discontinue inputting data.

Display values

” once and the next

Measured values, such as the flow rate, frequency, etc. are display values and cannot be directly
modified. However, there are many parameters which influence the formation of these measured
values. These parameters are described in the following section.

Display values include the flow rate, version number, year of construction, serial number, value of
the current output in mA, for example.

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Manual EC 24 · EN05 · 2015-02

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OPERATION

Parameters and modes of the EC 21 / EC 24

The following sections describe the meaning of the individual parameters.

Meter factor (pulse value)

With the meter factor (pulse value), the relevant flow rate at measurement conditions is calculated

18

from the signal frequency of the sensor element in the electronic totalizing unit:

3





Q

f



M

3600

K

m





h





f: Signal frequency (Hz)
K: Meter factor (pulses/m

: Flow rate at measurement conditions (m3/h)

Q

M

3

)

The meter factor has been calibrated in the factory in such a way that working cubic metres are
directly displayed.

Any modification of this adjustment is within the sphere of responsibility of the operating
company.

NOTE!
The new value is immediately used for all calculations performed after each modification of the
meter factor.

The uninfluenced signal frequency of the sensor element is available at the HF output.
The frequency range can be determined from the meter factor K and the minimum and maximum
flow rates at measurement conditions of the meter in accordance with the following formulae:

Q

minM

f

min

3600

K



f

max

Q

3600

maxM

K



Q

: Minimum flow rate at measurement conditions

Mmin

Q

: Maximum flow rate at measurement conditions

Mmax

K: Meter factor (pulse value)

Example:

Q

= 16 m3/h Q

Mmin

= 250 m3/h K = 2362 pulses/m3

Mmax

Hz5.10Hz2362

f

min

...............................................................................................................................................................................................................

16

3600

 Hz164Hz2326

f

max

250

3600



Manual EC 24 · EN05 · 2015-02

...............................................................................................................................................................................................................

OPERATION

Totalizer factor (decimal places)

You can set the totalizer factor in coordinate Z 01.

There are the following setting options:

Totalizer factor

Multiplier for value

Decimal places

displayed

0.01 2

19

0.1 1
1 0
10 10 0
100 100 0

Example:

If the factor has been set to 0.1, the meter reading will be displayed with one decimal.

If the factor has been set to 10, the value displayed will be shown without decimals and you will
obtain the actual meter reading by multiplying the value displayed by 10.

Output pulse value

The output pulse value indicates how many LF output pulses correspond to one cubic metre.
The output pulse value can be entered in coordinate A 05 from 0.01 to 100 as required.

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Manual EC 24 · EN05 · 2015-02

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OPERATION

Coordinate system

Pointer position V V· P T
Designation Totalizers Flow Rate Pressure Temperature
Coordinate / Line A B C D

20

1 Volume at base conditions Qb bara °C
2 Volume at measurement conditions Qm p min t min
3 Disturbing quantity totalizer Vb Frequency p max t max
4 Disturbing quantity totalizer Vm Qm min pb specified value tb specified value
5 Pulse scaling factor Qm max p default t default
6 Meter factor Qm max val. p binary display Factor adjustment value
7 Switch-off Qm Binary value at 0.5 V Offset adjustment value

8

9 Monthly data memory U min
10 Monthly data memory pu min
11 Monthly data memory Rise
12 Monthly data memory Factor correction value
13 Monthly data memory Offset correction value

14 ... 22 Monthly data memory

Pointer position C Io Error / Type Mode

Designation Analysis Outputs Error / ID Mode / Memory
Coordinate / Line E F G Z

1 Conversion factor Current Error text TerzMode

2 K coefficient Current min Software version EcMode

3 K specified value Current max Serial number Puls_X

4 Hs Current default Checksum Puls_Y

5 Rhon Current rise Ser. no. pressure transmitter Time

6 CO2 Current offset p min Date

7 Zb Current damping p max Modbus address

8 Z Ser. no. temperature transmitter ModbusRegOffset

9 Hs ref temp T min Error bit string
10 N2 T max Wake-up pulse
11 rd Ser. no. meter Code number
12 Meter size Beginning of gas day
13 Battery change EcMode2
14 Charge no.
15 K factor formula
16 Change of code number

Time limit for
Q < Qm.min

Binary value at 4.5 V AD binary value

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Manual EC 24 · EN05 · 2015-02

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OPERATION

Description of individual columns

Column structure

Press the above function key and then the ► key once.

Pointer position V

Coding

S 1 Nm3 Main totalizer, volume at base conditions m3

S 2 m3

S 3 VbD

S 4 VmD

Coordinate

/ Line

Designation of the
column line

Coding of the matrix fields
H = Header
D = Display value
C = Access to a data field which is
protected by the user code
S = Access to a data field which is
protected by the calibration switch

The calibration switch is realized by a screw on the left (EC 24) or right (EC 21) side of the device
(see fig. on page 10). For opening the calibration switch just unscrew the screw by some turns until
the text “Input” is blinking in the display. Then all parameters coded with “S” or “C” can be
changed.

Designation of columns A to O

A Description of the coordinate Unit Special feature

Main totalizer, volume at measurement

Disturbing quantity totalizer, volume at

Disturbing quantity totalizer, volume at

measurement conditions

Abbreviated
designation of the

conditions

base conditions

Unit of the value displayed
or programmed

m3

m3

m3

matrix field

Explanatory notes on a

Field designation shown in the
display of the EC 21 / EC 24

coordinate field

Note: In the software version 1.0 the
user code is not yet implemented. To
change parameters with “C” coding it is
necessary to open the calibration
switch!

21

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Manual EC 24 · EN05 · 2015-02

...............................................................................................................................................................................................................

OPERATION

Totalizers

22

Pointer position

Coding

Coordinate /

Line
S 1 Nm3 Main totalizer, volume at base conditions m3
S 2 m3 Main totalizer, volume at measurement conditions m3
S 3 VbD Disturbing quantity totalizer, volume at base conditions m3

S 4 VmD

S 5 I/m3 Pulse scaling factor I/m3
S 6 I/m3 Meter factor I/m3

D 9 ... 22

A

Disturbing quantity totalizer, volume at measurement

Description of the coordinate Unit Special feature

conditions

Monthly data memory 1 ... 14

(Date, Vb, Vm, dVb, dVm, P, T)

V

m3

Flow rate

Pointer position

Coding

Coordinate /

Line
D 1 N3H Flow rate at base conditions m3/h
D 2 m3/h Calculated flow rate at measurement conditions m3/h
D 3 F Frequency (measurement) Hz

S 4 Qm< Lower fault limit m3/h
S 5 Qm> Upper fault limit m3/h

D 6 Qmx

S 7 qug Creeping limit m3/h
S 8 qmt Time limit for operation below Qm< s

B

Maximum value of the flow rate at measurement

Description of the coordinate Unit Special feature

conditions

·

V

m3/h

Pressure

Pointer position

Coding

D 1 bar Measured value for pressure (absolute pressure) bara

C 5 p-def Default value, pressure bara
D 6 Dig Pressure, binary display
D 7 Dig Binary value at 0.5 V
D 8 Dig Binary value at 4.5 V

Coordinate /

Line

S 2 p< Lower fault limit bara
S 3 p> Upper fault limit bara
S 4 pb Specified value, pressure at base conditions bara

S 9 Umi Constant, pressure transmitter base calibration V
S 10 pmi Constant, pressure transmitter base calibration bara
S 11 p-S Constant, pressure transmitter base calibration
S 12 pA0 Correction value, pressure transmitter (factor)
S 13 pA1 Correction value, pressure transmitter (offset)

C

Description of the coordinate Unit Special feature

...............................................................................................................................................................................................................

P

Manual EC 24 · EN05 · 2015-02

...............................................................................................................................................................................................................

OPERATION

Temperature

Pointer position

Coding

Coordinate /

Line

D 1 °C Measured temperature value °C

S 2 T< Lower fault limit °C
S 3 T> Upper fault limit °C
S 4 Tb Specified value, temperature at base conditions °C

C 5 T-def Default value, temperature °C

S 6 T-F Adjustment value (factor)
S 7 T-O Adjustment value (offset)

D 8 Dig Binary value of AD converter

D

Description of the coordinate Unit Special feature

T

Analysis

Pointer position

Coding

Coordinate /

Line
D 1 C Conversion factor 1
D 2 K K coefficient 1
C 3 K-V Specified value, K coefficient (if K=const) 1

C 4 Hon Superior calorific value

C 5 rhn Rhon Kg/m3
C 6 CO2 Carbon dioxide content %
D 7 Zb Compressibility factor at base conditions 1
D 8 Z Compressibility factor at measurement conditions 1

S 9 TB Reference temperature, superior calorific value °C
C 10 N2 Nitrogen content (for AGA-NX-19) %
C 11 dv Relative density (for AGA-NX-19) 1

E

Description of the coordinate Unit Special feature

C

KWh/m

3

23

Outputs

Pointer position

Coding

Coordinate /

Line
D 1 mA Current out mA
C 2 I< Value at 4 mA mA
C 3 I> Value at 20 mA mA
C 4 I-def Current default mA
C 5 I-F Current rise
C 6 I-O Current offset
C 7 I-D Current damping

F

Description of the coordinate Unit Special feature

...............................................................................................................................................................................................................

Manual EC 24 · EN05 · 2015-02

Io

...............................................................................................................................................................................................................

OPERATION

Error / ID

24

Pointer position

Coding

Coordinate /

Line
D 1 ERR Error text
D 2 Ver Software version

S 3 SNo Serial number

D 4 CRC Checksum

S 5 PNo Serial number pressure transmitter
S 6 P < Pressure range min bar
S 7 P > Pressure range max bar
S 8 TNo Serial number temperature transmitter
S 9 T < Temperature range min °C
S 10 T > Temperature range max °C
S 11 ZNo Serial number gas meter
S 12 G Meter size
S 13 Bat Date of next battery change

G

Description of the coordinate Unit Special feature

Error / Type

Mode / Memory

Pointer position

Coding

Coordinate /

Line
C

C

C 3 X Puls_ X
C 4 Y Puls_ Y
C 5 T Time
C 6 D Date
C 7 Mid Modbus address
C 8 Mof Modbus register offset
C 9 Err Error bit string (hexadecimal)
D 10 Pul Wake-up pulse

- 11 COD Code number Presetting: 1234

C 12 h Beginning of day for data logger full hour (0-23)

S

D 14 CNO Charge number
D 15 ZG 10=GERG, 11=AGA-NX-19, 12=AGA-8 fixed value
C 16 C-V Input for change of the code number

1 MOD TerzMode

2 MOD EcMode

13 MOD EcMode2

Z

Description of the coordinate Unit Special feature

TerzMode, EcMode and EcMode2 are 8-digit strings where each digit stands for one mode. These
modes are listed in the following tables.

Mode

See operating

modes

See operating

modes

See operating

modes

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Manual EC 24 · EN05 · 2015-02

...............................................................................................................................................................................................................

OPERATION

Operating modes

0

1

2

3

4

5

6

7

TerzMode[7]

TerzMode[6]

1 channel

Operating mode

Current output

off

1 channel Vm Run

1 channel Vm Stop

Iout without error

Iout 3.5 mA with error

// X:Y act. (SW) Vm Stop

2 channels

Iout 21.8 mA with error

// X:Y act. (SW) Vm Run

2 channels

// X:Y act. (HW) Vm Run

// X:Y act. (HW) Vm Stop

2 channels // X:Y deactivated

2 channels

2 channels

8

9

0

1

2

3

4

5

6

7

8

9

off

mode

pos. edge

, p, T

m

, dV

b

, dV

m

, V

b

V

neg. edge

Frequency

EcMode[7]

Off

mode

EcMode[6]

Data logger

25

1

0.1

0.01

factor

TerzMode[5]

Pulse scaling

off

protocol

Interface

TerzMode[4]

TerzMode (coordinate Z1)

Display

TerzMode[3]

Pulse width

TerzMode[2]

Units

TerzMode[1]

Internal

TerzMode[0]

cut-off time

LF output

Modbus ASCII

1 min.

5 min.

125 ms

250 ms

cf

m3, bar, °C

service

customer

0

1

10

Modbus RTU

10 min.

15 min.

2

3

100

test mode

4

5

mode

GERG

K=const

Analysis

EcMode[5]

all coord. on

clear Qm max.

clear data logger

6

7

8

9

EcMode (coordinate Z2)

EcMode[4]

EcMode[3]

EcMode[2]

EcMode[1]

EcMode[0]

LF-II

0.8 ms

Pulse width

LF

Vm

selection

off

Current

selection

off

mode

Temperature

off

mode

Pressure

0

10 ms

Vb

default

PT 1000

on

1

AGA

20 ms

50 ms

Qb

Qm

default

default

2

3

75 ms

temp

4

100 ms

125 ms

pressure

5

6

250 ms

7

8

9

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Manual EC 24 · EN05 · 2015-02

...............................................................................................................................................................................................................

OPERATION

0

1

2

3

4

5

6

7

8

9

The connection of a

tamper contact is only

possible with the one-

channel version via the

sensor input 2.

26

OFF

mode

EcMode2[7]

Tamper contact

mode

Spare

EcMode2[6]

mode

EcMode2[5]

Device type-

tamper contact open

tamper contact closed

meter

meter + T

corrector + T

meter + p + T

corrector + p + T

mode

Spare

EcMode2[4]

EcMode2 (coordinate Z13)

EcMode2[3]

EcMode2[2]

EcMode2[1]

EcMode2[0]

mode

Spare

mode

Protection

mode

GERG-TB

mode

GERG-TN

fiscal metering

0

0.00°C

0

secondary metering

15

15.00°C

1

20

15.56°C

2

25

20.00°C

3

4

5

6

7

8

9

...............................................................................................................................................................................................................

Manual EC 24 · EN05 · 2015-02

...............................................................................................................................................................................................................

OPERATION

Error messages

In coordinate G 01 error messages are displayed as error number followed by “Err”.

The messages no. 1 to 8 are fault messages. In this case the main totalizers stop and the disturbing
quantity totalizers start to run. The messages no. 9 to 16 are warnings and have no effect on the
totalizers.

Error no. Hexadecimal Description

1 0x0001 Parameters in EEPROM are wrong (may be wrong version)
2 0x0002 EEPROM can not be written (parameters are lost)
3 0x0004 Analog digital converter for temperature measurement
4 0x0008 Analog digital converter for pressure measurement
5 0x0010 Sensor failure
6 0x0020 Measured temperature outside limits
7 0x0040 Measured pressure outside limits
8 0x0080 Hardware and software configuration do not fit

9 0x0100 Tamper contact
10 0x0200 Error during GERG calculation
11 0x0400 Error in flow rate measurement
12 0x0800 Error in monthly data logger
13 0x1000 Current output
14 0x2000 Too many output pulses in buffer (>500)
15 0x4000 Sensor defect (check hardware)
16 0x8000 Sensor defect (check hardware)

In the column “Hexadecimal” the error bit strings displayed in coordinate Z 09 are listed.

27

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Manual EC 24 · EN05 · 2015-02

...............................................................................................................................................................................................................

OPERATION

Changing the batteries (EC 24)

The two batteries of the EC 24 can easily be changed without opening the corrector. On the left
side of the casing, there is a round slotted cover which can be screwed out. Behind this cover,
there is the battery holder. In hazardous areas disconnect the battery holder and change the
batteries in a safe area. Afterwards connect the battery holder again (see figure) and push it into
the battery compartment. Now screw in the cover again and the battery change is terminated.

28

In safe areas the batteries can be changed directly without disconnecting the battery holder.

If you use other batteries than the replacement batteries from RMG, you run the risk of
the EC 24 not being approved for areas subject to explosion hazards any more.

In areas subject to explosion hazards, you must never insert or remove the batteries.
Remove the battery holder from the case and change the batteries in an area without
explosion hazards.

red
blue
blue
red

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Manual EC 24 · EN05 · 2015-02

...............................................................................................................................................................................................................

ANNEXES

Annexes

A Equations used with the EC 21 temperature corrector and
the EC 24 volume corrector

Symbol Unit Designation

= m3/h Flow rate at measurement conditions

q

m

fv = Hz Frequency of the volume transducer
KV = P/m3 Meter factor
Vm = m3 Volume at measurement conditions
Pv = 1 Volume pulse
KZ1 = m3/P Totalizer factor (for output contacts only)
qb = m3/h Flow rate at base conditions
Vb = m3 Volume at base conditions
C(p,t) = 1 Conversion factor
K

= m3/P Totalizer factor (for output contacts only)

Z2

p = bara, (Absolute) pressure at measurement conditions

2

(barg, kg/cm

)
pb = bara Pressure at base conditions
(barg, kg/cm2) (= 1.01325 bar absolute)

T = °C Temperature at measurement conditions
TK = K Temperature at measurement conditions in Kelvin
Tb = K Temperature at base conditions (= 273.15 K)
K = 1 K coefficient
Z = 1 Compressibility factor at measurement conditions
Zb = 1 Compressibility factor at base conditions
Z and Zb are calculated in compliance with GERG-88 as per G9.

29

...............................................................................................................................................................................................................

Manual EC 24 · EN05 · 2015-02

...............................................................................................................................................................................................................



ANNEXES

Flow rate at measurement conditions

f

V

=q

m

K

V

3600



Volume at measurement conditions

30

P

1

m

V

=V 

K

K

Z1V

K coefficient

Z

=K

Z

b

Conversion factor

T p

=C

t)(p,

b

KTp



Kb

Flow rate at base conditions

f

V

= q

b

K

V

3600C



Volume at base conditions

C V= V 

1

t)(p,mb

K

Z2

The pressure at measurement or base conditions is processed as absolute pressure in the relevant
equations. In selection mode 2 of column A, however, transmitters with gauge-pressure or kg/cm2
scaling are also permitted. If these transmitters are used, the pressure at base conditions must also
be indicated in the appropriate unit. Both the pressure at measurement conditions and the pressure
at base conditions will then be converted automatically for the relevant equations.

...............................................................................................................................................................................................................

Manual EC 24 · EN05 · 2015-02

...............................................................................................................................................................................................................

ANNEXES

B Block diagram for the EC 21 / EC 24

31

RS 485 (Modbus)

Serial
interface

EZD or RS485

Pulse comparison

Current module

Memory+

Print+Clock

4 to 20 mA

Current
output

TERZ 94

FaultHFLF (Vb or Vm)

Signal
output

8-digit display

8.8.8.8.8.8.8.8

Keyboard

Battery 3.6 V

Pulse
input

Analog
input

Analog
input

Inputs Correction Outputs

Reed switchorWiegand sensor

...............................................................................................................................................................................................................

Manual EC 24 · EN05 · 2015-02

Pressure

transmitter

U

Only EC 24

P

Temperature sensor

PT 1000

...............................................................................................................................................................................................................

ANNEXES

C Specifications

Temperature ranges

Type: EC 21 / 24 II2 G Ex ib IIC T4 from -20°C to +40°C
II2 G Ex ib IIC T3 from -20°C to +60°C

32

In the case of special designs, even higher or lower fluid temperatures are possible with not
explosion-protected (Non-Ex) versions.

Device types

Reed

Supply Internal battery (Ex),

or
external 24 V supply via current-loop connection by means of an
intrinsically safe power supply unit, e.g. KFD2-STC3-Ex1 (Ex) plus battery

pack.
Pulse input Reed or transistor
Current output Only possible via the current-loop connection.
Standby battery Only in conjunction with the current-loop connection.

Wiegand

Use Direct installation onto the TERZ 94 meter instead of the meter head.
Supply Internal battery (Ex),

or

external 24 V supply via current-loop connection by means of an

intrinsically safe power supply unit, e.g. KFD2-STC3-Ex1 (Ex) plus battery

pack.
Pulse input Wiegand
Current output Only possible via the current-loop connection.
Standby battery Only in conjunction with the current-loop connection.

...............................................................................................................................................................................................................

Manual EC 24 · EN05 · 2015-02

...............................................................................................................................................................................................................

ANNEXES

Inputs

Volume
– Reed

Pulse frequency 0 Hz to 4 Hz; in battery-powered mode, max. 1 Hz due to the service

life

Pulse width  20 ms
Voltage low:  0.9 V high:  2.2 V

33

– Wiegand

Pulse frequency 0 Hz to 400 Hz; in battery-powered mode
Pulse width  5 s
Voltage min: 1 V max: 5 V (depends on the sensor used)

Sensor – S1 input (Measurement input)

(For Ex connected loads, see the approval certificate.)

Terminals: X5,1 (+)
X5,2 (-)
Sensor type:
Wiegand sensor, direct Jumpers X_S1 / 3-5 and 4-6
Wiegand sensor, remote totalizer Length of line < 50m1)
Jumpers: X_S1 / 3-5 and 4-6
Jumpers: X_TERZ90 / 1-2
Reed contact Jumpers X_S1 / 1-3 and 2-4

Sensor – S2 input (Reference input)

(For Ex connected loads, see the approval certificate.)

Terminals: X5,3 (+)
X5,4 (-)
Sensor type:
Wiegand sensor, direct Jumpers X_S1 / 3-5 and 4-6
Wiegand sensor, remote totalizer Length of line < 50m1)
Jumpers: X_S2 / 3-5 and 4-6
Jumpers: X_TERZ90 / 3-4
Reed contact Jumpers X_S2 / 1-3 and 2-4

1) Attention: In case of use of an external pressure transmitter the maximum cable length reduces
to 3m!

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Manual EC 24 · EN05 · 2015-02

...............................................................................................................................................................................................................

ANNEXES

Temperature input: (hardware and software option)

For Ex connected loads, see the approval certificate.

Signal: Resistor (Pt1000), 2-wire
Terminals: X9,1 (+)
X9,2 (-)

34

Measuring range: -20°C to 60°C
Resolution: ± 0.2 °C

Pressure transmitter

For Ex connected loads, see the approval certificate.

Signal: Voltage: 0.5 V to 4.5 V
Resolution: 16 bits

Terminals: Plug X16_0

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Manual EC 24 · EN05 · 2015-02

...............................................................................................................................................................................................................

ANNEXES

Outputs

HF output

In the case of the explosion-protected (Ex) design, the device can only be connected to a certified
intrinsically safe circuit.

Connector: 3 (-) internally: X4,3
6 (+) internally: X4,4
Output: Open-drain transistor
T

: 1 ms ± 10%

Pulse

F

: 300 Hz

max

Ex Non-Ex
U

: 2.0 V 2.0 V

min

U

: 28 V 30 V

max

I

: 60 mA 400 mA

max

External inductance 1 H
External capacitance 25 μF

LF output

35

In the case of the explosion-protected (Ex) design, the device can only be connected to a certified
intrinsically safe circuit. (For Ex connected loads, see the approval certificate.)

Connector: 1 (-) internally: X4,1
4 (+) internally: X4,2
Output: Open-drain transistor

: 125 ms ± 10% (F

T

Pulse

250 ms ± 10% (F

max

max

: 4 Hz)
: 2 Hz)

Ex Non-Ex
U

: 2.0 V 2.0 V

min

U

: 28 V 30 V

max

I

: 60 mA 400 mA

max

External inductance 1 H
External capacitance 25 μF

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Manual EC 24 · EN05 · 2015-02

...............................................................................................................................................................................................................

ANNEXES

Fault output

In the case of the explosion-protected (Ex) design, the device can only be connected to a certified
intrinsically safe circuit. (For Ex connected loads, see the approval certificate.)

Connector: 2 (-) internally: X4,5
5 (+) internally: X4,6
Output: Open-drain transistor

36

Ex Non-Ex
U

: 2.0 V 2.0 V

min

U

: 28 V 30 V

max

I

: 60 mA 400 mA

max

External inductance 1 H
External capacitance 25 μF

RS-485 data interface

In the case of the explosion-protected (Ex) design, the device can only be connected to a certified
intrinsically safe circuit. (For Ex connected loads, see the approval certificate.)

Connector: 4 (+supply) internally: X15,4
1 (-supply) internally: X15,3
5 (line A) internally: X15,2
3 (line B) internally: X15,1

: 5.0 V

U

min

U

(Ui) 10.5 V

max

Ii: 428 mA
Pi: 900 mW
Inner capacitance: 1.32 μF
Inner self-inductance: 600 μH
External capacitance: 23.7 μF
External inductance: 1 H

Note: If the RS-485 interface is used, the device is supplied via the data interface.

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Manual EC 24 · EN05 · 2015-02

...............................................................................................................................................................................................................

ANNEXES

Current-loop connection

Terminals: X22,1 (+) with cable: white conductor
X22,2 (-) with cable: brown conductor

(min): 12 V

U

ext

U

(max): 28 V

ext

I

: 3.5 mA

min

: 23 mA

I

max

37

External load (max.): R
e.g. U
 R

Lmax

= (U

Lmax

= 16 V

ext

- 10 V) / I

ext

(in )

max

= (16 V - 10 V) / 23 mA = 260 

Current output for

- minimum flow rate: 4 mA

- maximum flow rate: 20 mA

- warning: 3.5 mA

- fault: 23 mA
Accuracy of current output: Better than 1% of the upper-range value

Data for use in areas subject to explosion hazards:

Ui = 28 V
Ii = 110 mA
Pi = 770 mW
Ci = 2.2 nF
Li = 110 μH

Supply

Battery
supply 3.6 V lithium cell; inside the device (battery pack)

External 24 V
supply 24 V DC; external; via current-loop connection
plus battery pack

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Manual EC 24 · EN05 · 2015-02

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A

ANNEXES

D Examples of connection (EC 21 and EC 24)

Battery-powered device

Hazardous area Safe area

38

3

2

1

4

6

5

RS 485

LIYCY 2x2x0.5 mm blue

4

3

2

1

5

6

Connector,
Binder Series 423

2

Pin assignment (692):

1= LF - 4= LF +
2= Alarm - 5= Alarm +
3= HF - 6= HF +

Pulse outputs

LIYCY 3x2x0.75 mm blue

2

Isolating device

Type: Datcom-K3

Isolating amplifiers

KFD2-SOT-Ex2 (24 V/DC)

PE

PE

PE

12

11

7

8

12

11

9

10

12

11

7

8

5
6

5
6

5
6

24 V/DC

PE

PC

larm

HF

LF

* If 2-channel isolating amplifiers

are used, the two inputs must
be separated!

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Manual EC 24 · EN05 · 2015-02

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A

ANNEXES

Mains-powered device

(Connection only via a current module with built-in back-up battery)

Hazardous area Safe area

3

2

1

4

6

5

RS 485

LIYCY 2x2x0.5 mm blue

4

3

2

1

5

6

Connector,
Binder Series 423

2

Pin assignment (692):

1= LF - 4= LF +
2= Alarm - 5= Alarm +
3= HF - 6= HF +

Pulse outputs

LIYCY 3x2x0.75 mm blue

2

Isolating device

Type: Datcom-K3

Isolating amplifiers

KFD2-SOT-Ex2 (24 V/DC)

PE

PE

PE

12
11

7

8

12
11

9

10

12
11

7

8

5
6

5
6

5
6

24 V/DC

PE

39

PC

larm

HF

LF

Connector,
Binder Series 713

Current output

LIYCY 2x0.75 mm
blue

(brown)
(white)

Supply unit

e.g. KFD2-STC4-Ex1 (24 V/DC)

2

* If 2-channel isolating amplifiers

are used, the two inputs must
be separated!

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Manual EC 24 · EN05 · 2015-02

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ANNEXES

E Instructions for the measuring element of the turbine meter

Construction

1

40

Electronic totalizing unit
or corrector

11

10

2

WF01/WF02 sensor

Measuring element

9

3

8

4

7

6

5

Part

Designation Material

1 Totalizing unit
2 Clamping screw Steel
3 WF01 or WF02 sensor
4 Permanent magnet Oerstit 500
5 Lubricator

(with TERZ 94 from DN 200)
6 Radial ball bearing Nirosta steel
7 Turbine wheel Delrin / aluminium
8 Flow straightener Hostaform
9 O-ring
10 Sensor sleeve with sensor Nirosta steel
11 O-ring 8x2.5 83FKM592

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Manual EC 24 · EN05 · 2015-02

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ANNEXES

Functional description

The measuring element directly measures the flow rate at measurement conditions and in the top­mounted meter head or corrector the measured values are integrated so that the result is the gas
volume which flowed through the meter. The gas flow drives a turbine wheel whose speed is
recorded through non-contact measurement by a sensor. Therefore, the meter is characterized by
long-term stability and low wear.

An aerodynamic flow straightener (8) fitted into the meter case constricts the effective cross

41

section of the pipe to form a ring-shaped cross-sectional area and substantially eliminates
turbulence. The velocity of the flowing gas increases and the gas is directed to the turbine blades.

The turbine wheel (7) is dynamically balanced and mounted with dust-proof ball bearings (6). A
permanent magnet (4) located at the end plate of the turbine shaft induces the sensor element (3)
to give a voltage pulse with each rotation of the turbine wheel. This pulse is further processed by
the electronic system of the meter head (1).

Inside the meter head or corrector, the number of pulses is divided by the meter factor (number of
pulses per m3) and the result is used to calculate the volume at measurement conditions. In the main
totalizer, the sum of the volume at measurement conditions which flowed through the meter is formed
and you can read the gas volume which flowed through the meter per time unit on the flow rate display.

At the HF output (only in the case of an electronic measuring element), the unchanged signal
frequency of the sensor element is outputted, whereas, for the LF output, this HF frequency can be
reduced by two programmable scaling factors.

Operating conditions

Permissible types of gases

The standard design of the TRZ 03 – TE / TEL turbine meters can be used for all non-aggressive
gases, such as

Natural gas Air
Town gas Acetylene
Methane Helium
Ethane Carbon dioxide (dry)
Propane Nitrogen
Butane Hydrogen

Special designs (PTFE lining, special lubrication, special material, etc.) can be used for aggressive
and humid gases, such as

Ethylene Digester gas
Biogas Sulphur dioxide
Acid gas etc.

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Manual EC 24 · EN05 · 2015-02

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ANNEXES

Permissible temperature ranges

For the standard design, the following fluid temperature and ambient temperature ranges are
permitted:
Fluid temperature range: -20°C to +60°C
For the ambient temperature range, see the ID plate and Annex C on page 32.

42

Pressure loss

The pressure loss is calculated using the following formula:

2

Q

Z=p

P

where p is the pressure loss [mbar]
Z

is the pressure loss coefficient

P

 is the density [kg/m3]
Q

is the flow rate at measurement conditions [m3/h]

M

DN is the nominal diameter of the meter [mm]

The pressure loss coefficient ZP is:

Z

= 5040 (TERZ 94, TRZ 03-TE) ZP = 6050 (TRZ 03-TEL)

P

This is an approximate mean value. The exact value is calculated from the pressure loss which is
determined on testing the volumeter.

Example of calculation:

M



4

DN

= 650 m3/h; DN 150;  = 1.3 kg/m3 [natural gas, 600 mbar]

Q

M

2

Q

mbar5.5

Z=p

P

DN

M

4

3.15040

650
150

2



4

Therefore, the pressure loss p with a TERZ 94 or TRZ 03-TE turbine meter is 5.5 mbar in this case.

Installation

The gas flow must be free of shocks and pulsations as well as free of foreign particles, dust and
liquids. Any components affecting the gas flow must absolutely be avoided directly upstream of the
TERZ 94 or TRZ 03-TE turbine meter.

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Manual EC 24 · EN05 · 2015-02

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ANNEXES

To achieve the highest possible accuracy, the following inlet pipe is to be installed upstream of the
meter:
TERZ 94: length of 2 DN, with one perforated-plate straightener
TRZ 03-TE: length of 2 DN (specified by Technical Guideline G 13)
TRZ 03-TEL: no inlet pipe required.
Downstream of the meter a straight pipe or a bend in the diameter of the meter and with a total
length of at least 2 DN has to be built in as outlet pipe.
In the case of the TERZ 94, you can install the meters in any position (vertical or horizontal) up to

43

and including the nominal diameter of DN 200. From the nominal diameter of DN 250 and in the
case of the TRZ 03-TE / TEL, only the position stated in the purchase order is possible.

When you install the meter, please observe the direction of flow indicated on the case!

The meter head (1) can be turned after the clamping screw (2) has been loosened. Turn the meter
head by max. 360°, otherwise the signal wires can become twisted and break.

Start-up

Connecting the gas flow

Do not fill any downstream pipelines or station sections through the
TERZ 94 or TRZ 03 – TE / TEL turbine meters. This may speed up the turbine wheel and
lead to excessively high flow rates with resultant damage.

Short-time overload operation of 20% above the maximum flow rate Qmax is permissible. No
damage will occur in the case of a return flow without shocks.

Initializing the device

Set all totalizers to the meter reading of your choice. (See programming.)
Now check the settings of the pulse width, decade scalers, etc.

In the case of models with a current output:
Also check the settings of the current output.

NOTE:
All parameters can only be changed if the device has been opened.

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Manual EC 24 · EN05 · 2015-02

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ANNEXES

F Dimensions

44

80 80

DN H1

25 190
40 190
50 225
80 260
100 265
150 295
200 325
250 370
300 385
400 375
500 395

EC24

140150

TERZ meter
(flange-design)

Flow direction from left to right

120

140

pipe no. 1

Ø 6 x1

*

45

display

H1

Pr

Flow direction from right to left*Standard installation

display

pipe no. 2

Ø 6 x1

Pr

MESSTECHNIK GMBH

35510 Butzbach

Dimensions
volumeter/PT-corrector

type EVC 24

Drwg. no.

058147.4

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Manual EC 24 · EN05 · 2015-02