WIKA CTM9100-150 - Handbuch (Seite 34)

34 WIKA operating instructions, models CTD9100, CTB9100, CTM9100
11263911.02 05/2014 GB/D
GB
9. Maintenance, cleaning and recalibration
9. Maintenance, cleaning and recalibration
9.1 Maintenance
The instruments described here are maintenance-free.
Repairs must only be carried out by the manufacturer.
This does not apply to the fuse replacement. Before replac-
ing the fuse, the calibrator or the micro calibration bath must
be disconnected by unplugging the mains cable from the
power supply outlet.
9.2 Cleaning
CAUTION!
■ Cool down the calibrator or micro calibra-
tion bath as described in chapter 8
“Cooling the metal block or micro calibra-
tion bath”.
■ Prior to cleaning, switch off and discon-
nect the calibrator or micro calibration
bath from the mains.
■ Clean the instrument with a moist cloth.
■ Electrical connections must not come into
contact with moisture.
■ Wash or clean the dismounted instrument
before returning it, in order to protect
persons and the environment from
exposure to residual media.
■ Residual media in the dismounted instru-
ment can result in a risk to persons, the
environment and equipment. Take suffi-
cient precautionary measures.
For information on returning the instrument
see chapter 11.2 “Return”.
9.2.1 Cleaning calibrators with inserts
With calibrators with inserts, during operation, a small
amount of metallic dust can cause the block and the sleeve
to become jammed. To prevent this, on a regular basis and
before any long period out-of-use, remove the inserts from
the calibrator heating block. Blow out heating block bores
with compressed air and clean the bore and sleeve with a dry
cloth.
9.2.2 Cleaning fan guards
On the base of each calibrator is a dense fan grille, through
which the cooling air is supplied to the calibrator. Depending
on the cleanliness of the air, clean the grille at regular inter-
vals by vacuuming or brushing.
9.2.3 Cleaning the micro calibration bath
Remove as much of the silicone oil as possible from the tank.
Then take the sensor basket out of the tank and clean the
basket, magnetic stirrer and tank with water, in which plenty
of detergent has been added. Let everything dry thoroughly.
When distilled water has been used, remove the calibration
liquid and let the sensor basket, magnetic stirrer and tank dry
thoroughly.
9.2.4 External cleaning
Clean the outside of the calibrator or micro calibration bath
with a damp cloth and some water, or with a solvent-free light
detergent.
9.3 Recalibration
DKD/DAkkS certificate
The calibrator or the micro calibration bath has been adjust-
ed and tested before delivery using measuring instruments
that are traceable to nationally-recognised standards.
On the basis of DIN ISO 10012, the calibrator or the micro
calibration bath, depending on the application, should be
verified at appropriate periodic intervals.
We recommend that the instrument is regularly recalibrated
by the manufacturer, with time intervals of approx. 12 months
or approximately 500 hours of operation. Every factory
recalibration includes, additionally, an extensive free-of-
charge check of all system parameters with respect to their
compliance with the specification. The basic settings will be
corrected if necessary.
The basis of the recalibration is the guidelines of the German
Calibration Service, DKD R5-4. The measures described
here should be used and followed for recalibration.