Troubleshooting
9.2 Application Problems
SITRANS F M TRANSMAG 2
66 Operating Instructions, 11/2009, A5E00102775-07
9.2 Application Problems
Table 9- 1 Troubleshooting list
Error Diagnosis Remedy
Power supply missing Connect or switch on power supply Sensor does not work or no
display or no output signal
Device fuse defective Check device fuse and replace if necessary
(see Changing fuses (Page 61))
Reflections in the glass Clean glass Transmitter does not react
to controls
Glass is not tight to the operating unit Screw in the electronic cover tightly
Personal code is activated Enter personal code (menu 6.1 or deactivate by
entering 0 in menu 6.2)
Transmitter cannot be
parameterized by the
operating module
Local operation lock activated by HART or
PROFIBUS
Cancel operation lock
Ambient temperature outside permissible
range
Remote design: bring transmitter into a
temperature range of 0 to 50 °C
Output signal OK but no
display visible
Display defective Change operating module
Low flow cut-off set too high Reduce low flow cut (menu 3.1.6)
Flow opposite to preferable direction at
setting of measuring direction to "forwards
only"
Switch over preferred direction menu (3.1.5.1)
or set measuring direction to "forw.+rev." (menu
3.1.5.2)
Measured value set to 0 via digital input Switch over signal at digital input (menu 4.3.2)
or switch off function (menu 3.3.1)
Cable connection to sensor defective
(only for remote design)
Check cable connection and exchange as
required
Flow display = 0 at available
flow
SmartPLUG defective Have SmartPLUG exchanged (only by service
personnel)
Hydraulic zero point drift, application-
dependent
Perform zero correction (menu 6.6.2) or enter
correction value directly (menu 6.6.1)
Transmitter indicates flow at
zero flow
Earthing problems Provide potential equalization (see Potential
equalization of sensor (refence potential)
(Page 18))
Air, gas occlusions Eliminate gas occlusions or use gas trap
Earthing problems Provide potential equalization (see Potential
equalization of sensor (refence potential)
(Page 18))
Vibrations in the sensor and/or in the
cable run
Fix the sensor better, strap cables
Medium conductivity too low Check conductivity; measuring method may be
unsuitable
Proportion of solids too high Reduce proportion of solids, measuring method
may be unsuitable
Fluctuating measuring
results at constant flow
Very unstable measurement, strongly
fluctuating values, output going towards
zero
Check for moisture in SmartPlug
If fitted with round SmartPlug call factory
product support
Inlet and outlet lines insufficient Change installation (see Sensor installation
(Page 14))
Measuring deviations,
measuring errors
Highly turbulent flow profile Change inlet line, use flow rectifier, reduce
diameter of tube
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