236_Instructions for use
11.3 Calibration interval
To obtain the indicated precision in measuring results, TRI-KA and
TRI-SEN must be regularly calibrated by our works service. We rec-
ommend a calibration interval of every 2 years at the latest.
Shorter periods are recommended if the device is frequently used
and/or in case of its use under adverse conditions.
11.4 Change of fuse
If the internal fuse has been triggered due to overload or faulty
operation, the device must be sent to our service for review.