Heinrichs Messtechnik GmbH
Page 38 of 122
OPERATING MANUAL TMU / UMC3
A fourth variable, the volume flow, is derived from the measured variables; mass flow rate and density.
Measuring range
The measuring range, which varies according to the used sensor, can be found in the relevant data sheet and
in sections 3.3.2, “TMU flow ranges” and 3.3.3, “Density measurement” on page 14.
The specified measuring range of the delivered sensor is also printed on the devices rating plate.
Outputs
Output circuits
The signal output circuits of the UMC3 are configurable partly as passive and partly as active outputs. Passive
outputs require an auxiliary power input for operation.
The output circuits are segregated from the rest of the UMC3 circuitry. They are also galvanically isolated
from each other as well as to ground.
Analogue outputs:
2x 4 to 20 mA active current outputs
Current output 1:
Mass flow, volume flow, density, temperature
(Output 1 superimposed with HART
®
protocol )
Current output 2:
Mass flow, volume flow, density, temperature
Refer to section 4.8.2, “Current outputs” on page 39 for connection advice and section 7.2.10, “CURRENT
OUTPUTS functional class” on page 90 for programming of the current outputs.
