Heinrichs Messtechnik GmbH
OPERATING MANUAL TMU-W / UMC4
Page 13 of 118
3.3
Performance characteristics of the TMU-W sensor
Reference conditions
Established flow profile
Inlet section has to correspond to mounting length
Control valves always positioned downstream
Measurement is to be performed with a liquid containing no gas bubbles
Flow tubes are to be kept clean at all times
Process temperature is to be regulated as specified in Section 3.4.6, “Process conditions” on
page 19
Process pressure is to be regulated as specified in Section 3.4.8, “Process pressure range” on
page 19
Ambient temperature is to range from + 10 °C to + 30 °C (50 °F to 86 °F)
Warm-up period: 15 minutes
Standard calibration is to be performed at 20 %, 50 % and 100 % (two times each)
High-frequency interference is to be regulated according to the EMC standards stated in section
9, “Declaration of Conformity” on page 115
TMU-W flow ranges
Mass-flow
Model
min.
Measuring range
max.
Measuring range
Zero point stability
(of range)
kg/min [lbs/min]
kg/min [lbs/min]
kg/min [lbs/min]
TMU-W004
0.13 [0.3]
4 [8.8]
0.0004 [0.0009]
TMU-W006
0.5 [1.1]
16 [35.3]
0.0016 [0.0035]
TMU-W012
2.5 [5.5]
25 [55.1]
0.0025 [0.0055]
Table 1: TMU-W flow ranges
Reference conditions: in conformity with IEC 770:
Temperature: 20 °C, relative humidity: 65 %, air pressure: 101.3 kPa
Fluid: water
Density measurement
Due to its constructive properties, a density calibration for the TMU-W family of sensors is not foreseen,
thus also disabling the determination of volume flow.
