BRUEL & KJAER VIBROCONTROL 8000 - 8.2.3 TMM and Externally Powered (4-20 mA) Transmitters (Use Caution)

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Brüel & Kjaer Vibro │ Instruction
VC-8000 MPS
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8.2.3 TMM and Externally Powered (4-20 mA) Transmitters (Use Caution)
The TMM can be used with 4 to 20 mA transmitters (externally powered) using a 68-ohm resistor.
The resistor converts the current into a voltage range suitable for TMM measurements.
Use Caution. Incorrectly wired transmitters may cause over-voltage and subsequent circuit failures in
the TMM. Whenever possible, it is recommended to use a UMM module for 4-20 mA (Process
Variable channels).
Figure 8-12) TMM process variable transmitter wiring
APPLICATION ALERT!
Do not connect TMM PV channels as listeners in loops connected to other devices. This
will cause errors in the readings.
CAUTION
Wiring mistakes can cause an over voltage of the TMM input circuitry and will damage
the TMM. For a more robust solution, please use a UMM for Process Variable inputs
(4-20 mA).