ALTANA LC 4 - Manual (Page 11)

BYK LC 4 Commissioning
11
3.4 Storing the meter and sensor module
To maintain the operability of the meter and sensor module for a long time,
leave the sensor module connected to the meter as possible and avoid to
plug it on or off when it is not necessary. Thus, the watertight plug-in
connector will be well protected.
In order to store an already used sensor module separately from the meter,
protect the socket of the sensor module with the original protective cap.