Dew formation Dew formation and splashes do not damage the sensor, although measurement readings are cor-
rupted until all moisture on and around the sensing element has dried up completely.
Contaminated lters If the PTFE sintered lter ZE05 and the membrane lter ZE08 is contaminated with dust, grease and
oils, this can have a negative impact on the dynamic behaviour of the sensor.
Cleaning of lters If necessary, soiled lters and protective baskets can be screwed off and rinsed carefully. Bear in
mind the sensors wil not measure accurately until lters are completely dry. Please do not touch the
highly sensitive sensing element.
Cleaning of
sensor chip
Loose dust can be carefully cleaned off the humidity sensing element using distilled water or by
blowing the dust carefully off. Please do not touch the highly sensitive humidity sensing element.
Damaging inuences Depending on their type and concentration, aggressive media containing solvents can cause incorrect
readings or cause the sensor to fail.
Substances deposited on the sensor element (e.g. fats, oils, resin aerosols, paint aerosols, smoke
deposits etc.) are harmful as they eventually form a water-repellent lm or deteriorate the dynamic
behaviour of the sensor.
Mounting and user information
Position Install the sensor at a place where characteristic levels of humidity occur. The sensor tube resp.
measuring head or measuring chamber should be exposed to the ow of air. Avoid installation next
to heaters, doors or on outer walls. Avoid places exposed to the sun. Not reaching the given mini-
mum air speed can lead to measurement errors.
The sensors for wall mounting (series LW) can be mounted on a patress or directly on the wall.
It is important that the surface is even.
When mounting the sensors on a patress, avoid external air getting onto the humidity measuring
element of the sensor by sealing it appropriately.
The sensor should be mounted in such a way that no water can get into it.
To close the housing the screw is tightened until it stops.
We recommend that you lay the connection lines in a loop so that any water that may be present
can run off.
Fixing ange For mounting the xing ange (duct mounting of series LK), a hole pattern is printed on the packa-
ging.
To x the sensor, simply open the opening tab of the ange by nger pressure or with the help of a
pair of pliars. The sensor can be xed in the ange at any position.
Connection The electrical connection must be carried out by qualied personnel only. The sensors of the L Series
contain components, which can be damaged by the effects of electrical elds or by charge equalisation
when touched. When mounting the sensor, protective measures must be taken.
Lines to and from the sensor must not be installed parallel to strong electromagnetical elds.
In the case of a possible overvoltage please install surge protection devices.
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