Heinrichs Messtechnik GmbH
Ex- Supplement operating manual
UMC4 with TM/TMU/TME/TMR/TM-SH
Page
9 of 31
4.
Coriolis mass flow meter
4.1
Description of the TM, TME, TMU and TMR sensors
The TMU sensor is an “Intrinsic safety” type of protection device that is outfitted with the following four
independent potential-free circuits: These circuits are safely separated in the sensor
Excitation circuit
Sensor circuit 1
Sensor circuit 2
Temperature sensor circuit (PT1000)
If the transmitter is mounted externally, it should be connected to the sensor using a Heinrichs Messtechnik
cable that is specially designed for this purpose.
Although the appearance of the standard and explosion-proof transmitters is identical and their rating plates
contain the same information,
under no circumstances should a standard (non-explosion proof) transmitter
be connected to an explosion-proof sensor!
4.2
Device identification
The rating plates on Heinrichs Messtechnik flow meters that are suitable for use in potentially explosive
atmospheres are labeled accordingly. Since the sensor and transmitter have different ratings, each device has
its own rating plate.
TM/TME/TMU/TMR/TM-SH rating plate
Example: TM for process temperatures ranging from - 40 °C to 100 °C.
