Heinrichs Messtechnik GmbH
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OPERATING MANUAL TMU-W / UMC4
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(English)
Description
Possible cause of error and remedy
Does not vibrate The measuring tubes are not
vibrating
Possible causes:
Non-symmetrical filling of the flow tubes.
Air bubbles inside the flow tubes
Foam arising through air contents or decompression
effects.
Residues from media on the tube walls e.g. wax from
hydrocarbons, crystallized media, condensate when
measuring gas.
Possible electrical reasons:
Check the wires and terminals between exciter coil
and transmitter.
Check exciter wires for short circuit with sensor
housing.
Remedy:
Fill or empty the flow tubes completely – disconnect
transmitter from power for min. 30 sec. – reconnect
to power.
exc. too large
A excitation current exceeding the
limit will be detected.
exc. too small
Detects a too small exciter current /
exciter voltage
Check the lines between excitation coil and
transmitter.
Obligatory in Custody Transfer Mode
QM > 110 %
The mass-flow is 10 % larger than
the set measurement range end-
value.
Reduce the flow rate and adjust the measuring range
if necessary.
OVERFLOW !
Forward or Revers flow totaliser
overflow
Reset totaliser; possibly change to a bigger totaliser
unit
curr. 1 saturated The output of current interface 1 is
overdriven. Based on the selected
settings and the currently assigned
measured variable, the current to be
output is > 21.6 mA.
Check the upper-range value and the flow rate
settings.
curr. 2 saturated The output of current interface 2 is
overdriven. Based on the selected
settings and the currently assigned
measured variable, the current to be
output is > 21.6 mA.
Check the upper-range value and the flow rate
settings.
pulse out satur. The pulse output is overdriven. The
current measured value requires a
pulse rate, which cannot be
generated based on the set values
for pulse duration.
Check pulse duration, pulse value, and measuring
range.
Check the flow rate.
Содержание Heinrichs Coriolis Mass Flow Meter
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