Meter Head; Electrical Connections - RMG TERZ 94 Operating Instructions Manual

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Meter head

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.

Electrical connections

The LF and HF volume pulses and the alarm output 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 and TERZ 94-S:
4
5
6
PE (Screening)
PE (Abschirmung)
The supply/current-loop (TERZ 94-S only) is connected to the terminals X22 on the transmitter
board TERZ94trm.
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.
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Manual TERZ 94 · EN09a · 2017-11
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2 - / 5 +
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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.
LF signal
Alarm
HF signal
INSTALLATION
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