WIKA 73 - Manual (Page 10)

GB
12099431.05 10/2010 GB/D/F/E
10 WIKA operating instructions models 73, 74, 75
6. Commissioning, operation
When screwing the gauges in, the force required to do this must not
be applied through the casing, but only through the spanner flats
provided for this purpose and using a suitable tool.
6. Commissioning, operation
Installation with
spanner
■ 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 gas expansion
vessel (active length).
■ In pipelines or other measuring points, the temperature probe must
be angled as far towards the flow as possible.
■ Errors in thermal conduction occur if the area where the
temperature is to be measured is so small, that the mass of the
temperature probe acts as thermal capacity. Errors in thermal
conduction may also occur if the immersion depth is insufficient, if
the mounting fittings are connected to a good thermal conductor
(metal plate or similar) and there is a considerable difference
in temperature between the measuring and mounting element
temperatures.
■ Mount the dial casing free from vibration. If necessary, it is possible
to isolate the instrument from the mounting point by installing
a flexible connection line between the measuring point and the
thermometer and mounting the instrument on a suitable bracket.