Instructions for Use
– SCHMIDT
®
Flow Sensor SS 20.600
Page 34
Error image
Possible causes
Troubleshooting
Low signal w
N
is too
large / small
Measuring range too
small / large
I-mode instead of U-mode or
vice versa
Medium to be measured does
not correspond to adjustment
medium
Sensor element soiled
Check sensor configuration
Check type or load resistance
Is foreign gas correction con-
sidered?
Clean sensor head
Flow signal w
N
is fluctuating U
B
unstable
Mounting conditions:
Sensor head is not in the
optimum position
Inlet or outlet is too short
Strong fluctuations of
pressure or temperature
Check voltage supply
Check mounting conditions
Check operating parameters
Analog signal voltage
permanently at maximum
Load resistance of signal
output connected to +U
B
Connect load resistance to
AGND
Analog signal voltage
permanently at zero
Error signaling
Short circuit against (A)GND
Eliminate errors
Eliminate short circuit
Table 9
Transport / Shipment of the sensor
Before transport or shipment of the sensor, the delivered protective cap
must be placed onto the sensor head.
Avoid contaminations or mechanical stress.
Calibration
If the customer has made no other provisions, we recommend repeating
the calibration at a 12-month interval.
For this, the sensor must be sent in to the manufacturer.
Spare parts or repair
No spare parts are available, since a repair is only possible at the manu-
facturer's facilities. In case of defects, the sensor must be sent in to the
supplier for repair.
A completed declaration of decontamination must be attached.
The appropriate form “Declaration of decontamination” is enclosed with
the sensor and can also be downloaded at
tab
“Service & Support for Sensors”, heading “Product downloads”.
Alternatively it can be downloaded from
