
GMC-I Messtechnik GmbH
25
11
Maintenance – Recalibration
11.1 Housing Maintenance
No special maintenance is required. Keep outside surfaces clean and dry. Use a slightly
dampened cloth for cleaning. Avoid the use of solvents, cleansers and abrasives.
Note!
If the test case has not been used for a long period of time, the switches may
demonstrate increased contact resistance depending upon storage conditions.
If this is the case, actuate the switches several times.
11.2 Recalibration
The respective measuring task and the stress to which your measuring instrument is sub-
jected affect the ageing of the components and may result in deviations from the guaranteed
accuracy.
If high measuring accuracy is required and the instrument is frequently used in field applica-
tions, combined with transport stress and great temperature fluctuations, we recommend a
relatively short calibration interval of 1 year. If your measuring instrument is mainly used in the
laboratory and indoors without being exposed to any major climatic or mechanical stress, a
calibration interval of 2-3 years is usually sufficient.
During recalibration* in an accredited calibration laboratory
(DIN EN ISO/IEC 17025) the deviations of your instrument in relation to traceable standards
are measured and documented. The deviations determined in the process are used for cor-
rection of the readings during subsequent application.
We are pleased to perform DKD or factory calibrations for you in our calibration laboratory.
Please visit our website at www.gossenmetrawatt.com (
→
Services
→
DKD Calibration Cen-
ter or
→
FAQs
→
Calibration questions and answers).
By having your measuring instrument calibrated regularly, you fulfill the requirements of a
quality management system per DIN EN ISO 9001.
Note!
These tests can be performed on-site with the SECU-cal 10 calibration adapter
accessory.
*
Verification of specifications or adjustment services are not part of the calibration. For products from
our factory, however, any necessary adjustment is frequently performed and the observance of the rel-
evant specification is confirmed.