RMG TERZ 94 User manual

Operating Instructions
RMG Meßtechnik GmbH
Otto-Hahn-Strasse 5 · 35510 Butzbach (Germany)
P.O. Box 280 · 35502 Butzbach (Germany)
Tel: [phone] · Fax: + 49 6033 897-130
Status: 12/04
Serving the Gas Industry
– WORLDWIDE
Electronic Turbine Meter
TERZ 94

Introduction
Operating Instructions for the TERZ 94 Electronic Turbine Meter 1
Table of Contents
Introduction.............................................................................. 1
Functional Description............................................................ 2
Construction............................................................................................. 2
Meter head............................................................................................... 3
Block diagram.......................................................................................... 3
Safety Instructions .................................................................. 5
Installation................................................................................ 6
Operating conditions................................................................................ 6
Pressure loss........................................................................................... 7
Installation................................................................................................ 7
Electrical connections .............................................................................. 9
Installing the remote totalizing unit......................................................... 13
Start-up................................................................................... 14
Connecting the gas flow......................................................................... 14
Initializing the totalizing unit ................................................................... 14
Operation................................................................................ 15
Display................................................................................................... 15
Programming ......................................................................................... 17
Parameters and Modes of the TERZ 94 / 94-S...................................... 21
Power Supply......................................................................... 27
Maintenance........................................................................... 28
Lubrication ............................................................................................. 28
Changing the battery.............................................................................. 29
Specifications........................................................................ 30
Measuring range.................................................................................... 30
Measuring error...................................................................................... 30
Temperature ranges .............................................................................. 30
Inputs and outputs ................................................................................. 30
Materials used for the meter case.......................................................... 34
Examples of connection......................................................................... 35
Annex...................................................................................... 38
Overview of parameters......................................................................... 38
Standard parameters (factory setting).................................................... 39
Fault and event display.......................................................................... 41
Matrix of the TERZ 94 / 94-S ................................................................. 42
TERZ 94 button assignments................................................................. 43
Converting the TERZ 94 into the TERZ 94-S......................................... 44
Cable type abbreviations ....................................................................... 45
EC type approval certificate................................................................... 47

Introduction
The TERZ 94/94-S turbine meter complements the RMG TRZ 03, TRZ 03-L
and TRZ 03 K turbine meters (see RMG Publication Nos. 3.161-E and 3.171-
E).
The TERZ 94 / 94-S directly measures the flow rate at measurement
conditions and integrates the measured values, so that, as a result, the gas
volume which flowed through the meter is registered by an electronic
totalizing unit. 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.
The TERZ 94/94-S is provided with HF and LF outputs which allow the
device to be used as a flow transducer for control applications and remote
transmission.
Features
−For secondary applications
−With electronic totalizing unit
−Flow display
−Display of maximum flow values
−Alarm output
−Detachable meter head (for use as a remote totalizer)
−Digital transmission of meter readings
The two variants TERZ 94 and TERZ 94-S differ in the following features:
TERZ 94
−Battery operation
−Electronic suppression of the slow-down effect of the turbine wheel after
flow stop by external shut-down of the totalizer
TERZ 94-S
−External power supply
−4-20mA current output for outputting the flow rate

Functional Description
Operating Instructions for the TERZ 91 Electronic Turbine Meter 3
Functional Description
Construction
Part Designation Material
1 Meter head
2 Set screw Steel
3 Sensor WF01 (1-channel) or WF02 (2-
channels)
4 Permanent magnet Oerstit 500
5 Lubricator (from DN 200)
6 Radial ball bearing Nirosta steel
7 Turbine wheel Delrin / aluminium
8 Flow straightener Hostaform
1
11
2
3
10
9
8 4
7 6 5

Functional Description
4Operating Instructions for the TERZ 94 Electronic Turbine Meter
9 O-ring
10 Sensor sleeve with sensor Nirosta steel
11 O-ring 8x2.5 83FKM592

Functional Description
Operating Instructions for the TERZ 91 Electronic Turbine Meter 5
The TERZ 94/94-S volumeters form a series of uniform construction.
The meters consist of the following principal components:
- meter case
- measuring element (with turbine wheel and sensor) and
- electronic totalizing unit.
An aerodynamic flow straightener (8) fitted into the meter case constricts the
effective cross section of the pipe to form a ring-shaped cross-sectional area
and substantially eliminates turbulences. 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).
Meter head
Inside the meter head, 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, 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.
Block diagram
TERZ 94
In the display field of the TERZ 94 (not with the TERZ 94-S), a start-stop
totalizer or a resettable totalizer can be optionally displayed. Through the free
sensor input X5, either the volume metering of the start-stop totalizer is
interrupted or the resettable totalizer is reset (depending on the programming
of the TERZ 94).

Functional Description
6Operating Instructions for the TERZ 94 Electronic Turbine Meter
TERZ 94-S
The TERZ 94-S volumeter has a current-loop connection (X2_0 with current
module TERZ94trm) which serves as power supply and 4 to 20mA current
output at the same time. For this purpose, a power supply unit is required
which is to be connected to this output. The TERZ 94-S cannot be battery-
operated.
TERZ 94 1-channel
Channel 1
Start/Stop
Reset
1
K12345678 m3
HF output
LF output
1
n
fiCurrent output
1
n
A
larm contact
Option:
EZD or RS485 interface

Functional Description
Operating Instructions for the TERZ 91 Electronic Turbine Meter 7
TERZ 94 2-channel
Channel 1
Channel 2
1
K12345678 m3
HF output
LF output
1
n
fiCurrent output
1
n
A
larm contact
Option:
EZD or RS485 interface
With 2 channels:
pulse
monitoring
10 / 10000
180 °

Safety Instructions
8Operating Instructions for the TERZ 94 Electronic Turbine Meter
Safety Instructions
The TERZ 94/94-S volumeter is used for measuring the volume at
measurement conditions of non-corrosive gases and fuel gases.
Measurement of corrosive gases is only permitted if the special designs are
used which have been developed for such purpose. These meters are not
suitable for measuring liquids, otherwise they will be destructed.
The TERZ 94/94-S complies with currently applicable standards and
regulations. However, failure to operate them properly may cause hazards.
Persons who install or operate the TERZ 94/94-S volumeter in areas subject
to explosion hazards, must be familiar with the currently applicable explosion
protection standards and regulations.
The electronic totalizing unit of the explosion-protected design has been
approved for use in areas subject to explosion hazards and its code is:
II 2 G EEx ib[ia] IIC T3, T4
The appropriate certificate of conformity can be found in the annex and its
reference number is:
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 TERZ 94/94-S may
be used in areas subject to explosion hazards.
•The battery must be changed in an area without explosion
hazards.
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 TERZ 94 volumeter.
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!

Safety Instructions
Operating Instructions for the TERZ 94 Electronic Turbine Meter 9

Installation
10 Operating Instructions for the TERZ 94 Electronic Turbine Meter
Installation
Operating conditions
Permissible types of gases
The standard design of the TERZ 94 or TERZ 94-S can be used for all non-
corrosive 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 corrosive and humid gases, such as
Ethylene Digester gas
Biogas Sulphur dioxide
Acid gas etc.
Permissible temperature ranges
For the standard design, the following fluid temperature and ambient
temperature ranges are permitted:
Fluid temperature range: -10°C to +50°C
Ambient temperature range: -20°C to +60°C resp. +40°C

Installation
Operating Instructions for the TERZ 94 Electronic Turbine Meter 11
Pressure loss
The pressure loss is calculated using the following formula:
4
2
M
PDN
Q
Z=p ⋅ρ⋅Δ
where
Δp is the pressure loss [mbar]
Z
P is the pressure loss coefficient
ρis the density [kg/m3]
Q
Mis the flow rate at measurement conditions [m3/h]
DN is the nominal diameter of the meter [mm]
The pressure loss coefficient ZPis constant for all volumeters of the types
TERZ 94 and TERZ 94-S. It is:
Z
P= 5040
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:
QM= 650 m3/h; DN 150; ρ= 1.3 kg/m3[natural gas, 600mbar]
mbar5.5
150
650
3.15040
DN
Q
Z=p 4
2
M
P4
2=⋅⋅=⋅ρ⋅Δ
Therefore, the pressure loss Δp with a volumeter of the type TERZ 94 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 volumeter.
To achieve the highest possible accuracy (measuring error <1%), an inlet
pipe of 2 DN in length with a perforated-plate straightener should be installed
upstream of the meter.

Installation
12 Operating Instructions for the TERZ 94 Electronic Turbine Meter
You can install the meters in any position (vertical or horizontal) up to and
including the nominal diameter of DN 200. From the nominal diameter of
DN 250, only the position stated in the purchase order is possible.
When you install the volumeter, please observe the direction of flow
indicated on the case!
The meter head (1) can be turned after the set screw (2) has been loosened.
Turn the meter head by max. 360°, otherwise the signal wires can become
twisted and break.
You can install the meter head also vertically. To do this, you must proceed
as follows:
•Unscrew the cover of the meter head.
•Disconnect the two wires from terminal X5 (remember the polarity!).
•Loosen the set screw (2). Now you can remove the case of the meter head
and an aluminium assembly part will appear.
•On the side of the case, there is a hole which is covered with a screw.
Mount the retainer part to this hole and close the hole in the rear panel by
means of the screw.
•Thread the signal wires through the retainer part, place the meter head
onto the turbine case, turn it into the desired position and retighten the set
screw (2).
•Connect the signal wires again to terminal X5 (make sure that the polarity
is correct!) and screw on the cover again.

Installation
Operating Instructions for the TERZ 94 Electronic Turbine Meter 13
Electrical connections
The LF and HF volume pulses and the current output in non-Ex devices are
led out of the meter head by a 7-pin connector (Binder). All other connections
have to be made at the terminals on the board.
Standard connection TERZ 94 (Ex and non-Ex devices) and
TERZ 94-S (Ex devices):
Standard connection TERZ 94-S (non-Ex devices):
In areas subject to explosion hazards, the TERZ 94 must only be
connected to certified intrinsically safe circuits.
Make sure that the limiting values from the conformity certificate
(see appendix) for the devices, which have to be connected, are
not exceeded.
If one or more electric circuits are used, it is to ensure that with the cable
selection the permissible limiting values according to the EEC design
inspection certificate are not exceeded. Each ex signal circuit has to be wired
in its own cable, which is to be led through the appropriate cable gland. A
fixed installation of the intrinsically safe cables is mandatory. The connecting
cables have to be provided with core-end sleeves.
1
2
3
4
5
PE
(
Abschirmun
g)
6
1 - / 4 + LF signal
2 - / 5 + not connected
3 - / 6 + HF signal
PE (Screening)
1
2
3
4
5
PE
(
Abschirmun
g)
6
1 - / 4 + LF signal
2 - / 5 + Current output 4 to 20 mA
3 - / 6 + HF signal
PE (Screening)

Installation
14 Operating Instructions for the TERZ 94 Electronic Turbine Meter
To reach the electrical connections on the board, you must first remove the
cover of the meter head.
To convert from the meter head directly mounted on the meter case to the
remote totalizing unit and vice versa it is necessary to change the positions of
some jumpers (see inputs and outputs in the annex).
X_S1 (and X_S2*) X_TERZ90
Meter head mounted on meter case 3-5 and 4-6 all open
Remote totalizing unit 3-5 and 4-6 1-2 (and 3-4*)
* for 2-channel measurement only
TERZ 94:
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.
Jumpers X_S1 and X_S2 for
confi
g
uration of
p
ulse in
p
uts
Plug X3
Service module Pin connector button
on the case
Reset
(
solderin
g
p
ads
)
Terminal X5
Pulse in
p
uts
Plug X2_0
for current module
TERZ94trm and supply
Terminal block X4
Pulse out
p
uts
Jumper
XTERZ90
Programming keys

Installation
Operating Instructions for the TERZ 94 Electronic Turbine Meter 15
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 XS 2 to the
“reed contact” function.

Installation
16 Operating Instructions for the TERZ 94 Electronic Turbine Meter
TERZ 94-S:
In the case of the TERZ 94-S, terminal X22 (on current module TERZ94trm)
is used as current-loop connection to supply the device and as output current
(4-20mA).
The output signals can be picked up at the following terminals:
HF signals: Output X4, terminals X4,4 (+) / X4,3(-)
LF signals: Output X4, terminals X4,2 (+) / X4,1(-)
Now connect the cables and then put the cover again on the lower part of the
housing.
To connect the 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.
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.
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
Minimum cable cross section:
up to a length of 10 m: 6 mm2
from a length of 10 m: 10 mm2
Earthing screw

Installation
Operating Instructions for the TERZ 94 Electronic Turbine Meter 17
connection, control input). The shielding must always be connected to earth
on both sides. In the case of the TERZ 94, you must proceed as described in
the chapter “Cable glands”.

Installation
18 Operating Instructions for the TERZ 94 Electronic Turbine Meter
We recommend that cable cross sections between 0.25 mm2and 0.5 mm2
are used. Due to the cable gland, the outside diameter must be between
4.5 mm and 6.5 mm.
When 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!
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.
•Screw on the cap nut again.
Cap nut
Clamping piece
O-ring
Connecting piece