Instructions for Use
– SCHMIDT
®
Flow Sensor SS 20.700
Page 29
As soon as proper operational conditions are restored, the sensor re-
sumes measuring mode.
Even short-term exceeding or undershooting the operating tem-
peratures can cause irreversible damage to the sensor.
Environmental conditions of medium
The
SCHMIDT
®
Flow Sensor SS 20.700
is also suitable for relatively im-
pure gases. Dust or non-abrasive particles can be tolerated as long as
they do not form any deposits on the sensor elements.
Deposits or other soiling must be detected during regular inspections and
removed during cleaning because they can lead to distortion of the meas-
urement result (see chapter
Dirt or other deposits on the sensor elements may cause false
measurement results.
Therefore, the sensor must be checked for contamination at reg-
ular intervals and cleaned if necessary.
Condensing liquids or even immersion in a liquid lead to a strong falsifica-
tion of the measured values. After drying, correct measured values are
provided again.
Always avoid liquids on the sensor during operation because it
leads to serious measurement distortions.
8 Service information
Maintenance and cleaning of sensor head
Heavy soiling of the sensor elements may lead to measurement distortion.
The sensor head can be cleaned carefully if it is soiled or dusty.
The sensor head is a sensitive measuring system.
During manual cleaning proceed with great care.
Eliminating malfunctions
The following Table 10 lists possible errors (images), depicted by the LED
bar. A description of the way to detect errors is given. Furthermore, pos-
sible causes and measures to be taken to eliminate errors are listed.
The cause of any error signal must be remedied immediately.
Significantly exceeding or falling below the permitted operating
parameters can permanently damage the sensor.
