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Idiomas disponibles
5. Commissioning and operation
5.4 Mounting the measuring line
The smallest bending radius of the measuring line should not be less than 6
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mm [0.24 in]. Bending or interruption of the measuring line lead to failure of the
instrument.
If there are shocks or vibrations at the installation site of the probe, form several
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EN
freely swinging loops between the last fixing point and the probe. Any excess length
must also be coiled, since cutting the measuring line would render the instrument
unserviceable.
Avoid welding or soldering and permanent fastening of the measuring line as
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this could seriously damage the measuring line and impair the operation of the
instrument.
The measuring line should not be installed close to cold or heat sources.
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5.5 Mounting the case
The case ingress protection is indicated on the product label and must be observed
during installation.
5.6 Electrical connection
The electrical connection must only be made by qualified skilled personnel.
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Connect the switch via screw terminals.
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Screw terminal: conductor cross-section max. 1.5 mm
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flexible stranded wires are used)
The pin assignment is stated on the product label of the thermometer.
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5.7 Indication check
Indication checks should only be carried out in comparison with a more accurate instru-
ment or, if possible, with a calibrated instrument. The temperature during the check must
remain constant.
Fluctuating temperatures can lead to reading errors caused by the different response
times of the probes.
With thermometers without thermowells/protection tubes, with a full and correct inser-
tion length, a minimum waiting time of 5 minutes must be maintained for temperature
equalisation.
Temperature checks using thermometers with probes assembled with thermowells/
protection tubes can, in many cases, only result in a reference temperature at the test
item, due to permanent heat dissipation caused by the thermowell.
In temperature areas fitted with static checking thermometers (e.g. pipeline systems),
permanent deviations in reference temperatures can also be caused by the measuring
path. Ambient temperatures around the indicator case which differ substantially from
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The instruments do not provide for incorporated overcurrent protectors.
In order to prevent the contacts from welding through overload, suitable
protection systems must be implemented by the operator.
WIKA operating instructions expansion thermometer, model 70
2
(always use end splices if
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