Balluff BMD 1L K Série Notice D'utilisation page 178

Sonde de mesure tige et câble avec qualification sil
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10 Diagnostics and servicing
Check the 4 ... 20 mA
signal
Error
4 ... 20 mA signal not sta-
ble
4 ... 20 mA signal missing
Current signal greater than
22 mA or less than 3.6 mA
Treatment of measure-
ment errors
64
Connect a multimeter in the suitable measuring range according to
the wiring plan. The following table describes possible errors in the
current signal and helps to eliminate them:
Reason
Fluctuations of the
measured variable
Electrical connection
faulty
Voltage supply missing
Operating voltage too
low or load resistance
too high
Electronics module in the
sensor defective
The below tables show typical examples for application-relevant
measurement errors. There are two measurement errors:
Constant level
Filling
Emptying
The images in column "Error pattern" show the real level as a broken
line and the level displayed by the sensor as a continuous line.
Fig. 23: The broken line 1 shows the real level, the continuous line 2 shows the
level displayed by the sensor
Note:
Wherever the sensor displays a constant value, the reason could
also be the fault setting of the current output to "Hold value"
If the level indication is too low, the reason could be a line resist-
ance that is too high
Set damping appropriate to the instrument via the
display and adjustment module or PACTware/DTM
Check connection according to chapter "Connection
steps" and if necessary, correct according to chapter
"Wiring plan"
Check cables for breaks; repair if necessary
Check, adapt if necessary
Exchange the instrument or send it in for repair
1
2

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