Instructions for Use – SCHMIDT
®
Flow Sensor SS 20.600 Page 32
8 Service information
Maintenance
Heavy soiling of the sensor head may lead to distortion of the measured
value. Therefore, the sensor head must be checked for contamination at
regular intervals. If contaminations are visible, the sensor can be cleaned
as described below.
Cleaning of sensor head
If the sensor head is soiled or dusty, it must be cleaned carefully by means
of compressed air.
The sensor head is a sensitive measuring system.
During manual cleaning proceed with great care.
In case of persistent deposits, the sensor chip as well as the interior of the
chamber head can be cleaned carefully by using residue-free drying alco-
hol (e.g. isopropyl alcohol) or soapy water with special cotton swabs.
Figure 8-1 Suitable cotton swabs with small cleaning pads
Suitable for this purpose are cotton swabs which have small, flattened and
soft cotton pads (example see Figure 8-1). The flat side of that pad should
fit just between chamber wall and sensor chip to allow the exertion of a
controlled, minimal pressure on the chip. Conventional cotton swabs (e.
g. for ear cleaning) are typically too big and therefore can break the chip.
Under no circumstances do attempt to pressurize the chip with
greater force (e.g. by swabs with thick head or lever movements
with its stick). Mechanical overloading of the sensor element can
lead to irreversible damage.
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