Operating Manual

IRS31Pro-UMB Operating Manual V10 / 01.2020
G. Lufft Mess- und Regeltechnik GmbH 22
8 Maintenance
The road sensor should be serviced annually. This includes the visual inspection of the housing. It is
recommended to clean the sensor surface when very dirty. Cleaning should be done with a cloth. As a
cleaning agent isopropanol may be used.
Note: In no case, the electrodes may be processed with sandpaper or wire brush.
Where there is significant mechanical damage to the sensor, which could influence the tightness of the
housing, it is recommended to exchange the sensor. This also applies in the case where the plastic
assembly of the sensor is heavily degraded by wear and tear.
Note: If water gets into the housing of the sensor, the sensor with housing and cable must be
replaced.
8.1 Replacing the Sensor
If the plastic assembly of the road sensor becomes unusable due to mechanical effects, or the sensor
electronics are damaged, the plastic assembly can be replaced without the need to change the entire
housing.
Attention: Replacement must only be carried out when the road is dry!
To uninstall the plastic assembly, remove all six hexagonal screws. On the edge of the cover there is a
small opening that serves to provide access for a screwdriver. This allows the plastic assembly to be lifted
out. Take care not to pull out the connection cables on the underside of the sensor. The plug connections
must be removed without tensile strain on the cables.
Important: when changing the sensor, the ring gasket must always be replaced and a new drying agent
bag must be inserted.
The housing must be cleaned carefully before inserting a new sensor. Even tiny dirt particles in the seal
may lead to sensor failure in the long term. No moisture must be trapped in the housing. The new drying
agent bag must be taken out of the sealed protection cover only shortly before being placed in the
housing. The sticker indicates its functionality (blue: ok, pink: the drying agent is spent).
When connecting the plug connectors to the new sensor, be careful not to touch the electronics of the
sensor. Electrostatic discharge can destroy the sensor.
The seal must be fitted using silicone grease. It must not cant when the plastic cover plate is inserted.
The plastic cover plate must fit into the housing without the use of force. Grease the thread of the fixing
screws. First lightly fasten the screws and then tighten evenly (torque 2 Nm).