Maintenance - TESTO 0636.9835 Application Information

Maintenance

A robust, long-term stable humidity sensor is located
in the probe head.
Depending on the application and dirt which has
gathered, we recommend a quarterly to yearly control
with our 0554.0660 control and calibration set. See
the instructions on page 10.
Clean dirty sensors with alcohol (isopropanol) or
distilled water.
Unscrew the measuring chamber and the PTFE
sintered cap.
Dip the sensor in the alcohol, rinse in distilled water
and then leave to dry in the air.
Do not touch or knock the sensor.
Put the PTFE sintered cap back on and screw tightly.
Faulty sensors can be replaced, please contact our
service department.
Dirty PTFE sintered caps can also be cleaned in
alcohol or in distilled water. Impurities can be blown
out with compressed air. Always blow out the cap
from the inside.
Dirty measuring chambers can also be cleaned in
alcohol or in distilled water, or purged with
compressed air.
Should the measuring chamber be faulty, please
contact our service department.
8