Instructions for Use
– SCHMIDT
®
Flow Sensor SS 23.400 ATEX 3
Page 24
Removing malfunctions
Possible errors (error images) are listed in the following Table 5. The way
to detect an error is described. Furthermore, the possible causes and
measures to be taken to eliminate the error are listed.
Error image
Possible cause
Troubleshooting
No output signals
(OC1/2 locked;
A
Out
= 0 V / 0 mA)
Operating voltage
(not / incorrectly connected)
Check operating voltage and wir-
ing
Sensor defective
Send in for repair
Error message of
sensor
(OC1/2 conducting;
A
Out
= 0 V / 2 mA )
although there is a flow
Sensor element wetted
Wait until sensor element is dry
Blow out sensor tip, if necessary
Sensor element soiled
Clean sensor tip
Sensor element defective
Send in for repair
Unexpected values of
analog output
Measured A
Out
:
is too high / small
has strong noise / drift
Sensor configuration
(measuring range / indication
of direction / type of output)
Check order configuration and
measurement settings
Medium to be measured does
not correspond to calibration
medium
(Standard medium: Air at
1013.25 hPa and 20 °C)
Check medium parameters
Mounting conditions
(tilting / immersion depth)
Check installation conditions
Irregular flow conditions (tur-
bulences / other disturbances)
Check run-in distance
Increase damping of measured
values
Sensor element soiled
Clean sensor tip
Operating voltage
(stability / value)
Check operating voltage
Large variations in pressure
and temperature
Check medium parameters
Unexpected values of
switching outputs
Configuration
Check configuration
Faulty wiring
Check wiring
Digital short-circuit protection
active
Load resistance too small
(Increase R
L
> R
L,min
)
Reduce load capacity C
L
Insert resistor in series to C
L
Table 5
