WIKA SC15 - Handbuch (Seite 7)

GB
5. Installation, commissioning and operation
1148
690 09/
009 GB/D
WIKA Operating Instructions Combistat Model SC 7
Electrical connection
The connection diagram is shown on the instrument label on the
outer rim of the case.
5.1 Installation condition
Before installing the probe, check whether the probe material used (specified
in the delivery note) is chemically resistant/neutral to the medium being
measured. This also applies to thermowells.
Ensure that all the necessary accessories for the mounting method ordered
have been supplied e.g. instrument mounting brackets, clamp straps for panel
mounting, contact adjustment buttons, etc..
The accessories will be either on the instrument or supplied in a separate bag,
which in most cases will be attached to the thermometer.
If possible, the entire length of the stem should be exposed to the tempera-
ture to be measured, but, if not, it should at least be the length of the active
part (active length), which corresponds to the length of the expansion vessel.
In pipelines or other measuring points the temperature probe should be
directed as far towards the flow as possible.
If a thermowell is used, the stem must not be allowed to touch the bottom of
the thermowell.
Capillaries must be kink protected. The minimum bending radius for
capillaries should not be less than 6 mm. Any kinks or discontinuities in the
capillary may result in the failure of the instrument.
If the probe is installed in a location which is exposed to shock and vibration,
it is essential that the capillary is coiled in several loops, and free of tension
between the last attachment point and the probe. Any excess length should
also be coiled into loops, as cutting the cable would make the instrument
unserviceable.
Any welding or soldering of the capillary, as well as any permanent fastening
of the capillary, must be avoided, as this can severely damage the capillary,
and impair the operation of the instrument.
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