Treatment Of Measurement Errors - Vega VEGAPULS C 11 Operating Instructions Manual

10 Diagnostics and servicing
Code
Text message
M510
No communication with
the main controller
M511
Inconsistent software
configuration
Liquids: Measurement error at constant level
Fault description
Measured value shows a too
low or too high level
0 time
Measured value jumps to-
wards 100 %
0
time
36
Cause
Communication between main electronics
and display module disturbed
A software unit requires a software update Carry out software update

10.5 Treatment of measurement errors

The tables below give typical examples of application-related meas-
urement errors.
The images in column " Error description" show the actual level as a
dashed line and the output level as a solid line.
1 Real level
2 Level displayed by the sensor
Note:
If the output level is constant, the cause could also be the fault setting
of the current output to " Hold value".
If the level is too low, the reason could be a line resistance that is too
high
Cause
Min./max. adjustment not correct
Incorrect linearization curve
Due to the process, the amplitude of the
level echo sinks
A false signal suppression was not car-
ried out
Amplitude or position of a false signal
has changed (e.g. condensation, build-
up); false signal suppression no longer
matches actual conditions
Rectification
Check the connection cable to the display
Send instrument for repair
0
Rectification
Adapt min./max. adjustment
Adapt linearization curve
Carry out a false signal suppression
Determine the reason for the changed
false signals, carry out false signal sup-
pression, e.g. with condensation.
VEGAPULS C 11 • Two-wire 4 ... 20 mA
1
2
time