Commissioning, operation – WIKA 70-8xx User Manual
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GB
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11472988.02 04/2013 GB/D/F/E
WIKA operating instructions expansion thermometer, model 70
WARNING!
Before storing the instrument (following operation), remove any residual
media. This is of particular importance if the medium is hazardous to health,
e.g. caustic, toxic, carcinogenic, radioactive, etc.
6. Commissioning, operation
Please observe the following general requirements when mounting and operating the
instrument:
The scale range of the temperature control instrument should be selected so that the
maximum temperature present at the sensor does not exceed the scale range. Once
the switch point is exceeded, you should also be careful of any temperature rise that
occurs.
In operation, the instrument should not be exposed to any strong vibrations or shock
loadings.
Avoid soiling and strong fluctuations of the ambient temperature.
Cutting the measuring line leads to the destruction of the instrument and, thus, to a
shut-down of the electrical output signal.
Electrical connection
The terminal connections are given on the product label which is located
around the edge of the housing.
6.1 Installation conditions
Before mounting the sensor, check whether the sensor material used (specified in the
delivery note) is chemically resistant/neutral to the medium being measured. This also
applies to thermowells.
Make sure that the suitable accessories required for fastening the case of the instrument
into the panel are available.
The accessories are either fitted or located in a bag fastened to the thermometer.
If possible, the entire length of the stem should be exposed to the temperature being
measured. However, at least the length of the active part that corresponds to the length
of the expansion vessel (active length).
In pipelines or other measuring points, the temperature sensor must be positioned as
far towards the flow as possible.
When using thermowells, it must be ensured that the stem does not touch the bottom of
the thermowell.
5. Transport, packaging ... / 6. Commissioning, operation