Instructions for Use
– SCHMIDT
®
Flow Sensor SS 23.400 ATEX 3
Page 23
8 Service information
Maintenance
A soiled sensor tip may distort the measured value. Therefore, the sensor
tip must be checked for soiling at regular intervals. If the sensor tip is soiled
or wetted by a liquid, the sensor sends an error signal via the analog out-
put (0 V / 2 mA). In this case clean the sensor as described below. If the
error signal does not disappear after cleaning and drying, the sensor must
be sent in to the manufacturer for repair.
Cleaning of the sensor tip
If the sensor tip is soiled or dusty, it must be carefully cleaned by means
of compressed air (avoid strong pressure impulses!). If this procedure is
not successful, the sensor tip can be cleaned by immersing and washing
it in alcohol which dries without leaving residues (e.g. isopropyl alcohol).
As soon as the alcohol has evaporated, the sensor is again ready for op-
eration.
Do not shake or tap the wet sensor!
Do not try to clean the sensor tip by any type of mechanical
methods. Do not touch the sensor element located in the
chamber head. This may irreversibly damage the sensor.
Do not use strong cleaners, brushes or other objects like
fluffy cloths etc. to clean the sensor tip!
Inappropriate cleaning agents may leave residues or cake on
the sensor element and, therefore, lead to faulty measure-
ments or result in permanent damage to the sensor element.
If the chamber head gap of the sensor tip is completely filled
with cleaning agent, accelerate the drying process by blow-
ing it out, if necessary.
!
