WIKA intelliTHERM TGT70, Operating Instructions Manual

Page: 11 / 60

WIKA operating instructions model TGT70 11
EN
14047194.03 03/2022 EN/DE/FR/ES
6. Commissioning, operation
WARNING!
▶
Only work on the gauge with the voltage disconnected.
▶ Avoid strong vibrations and mechanical impacts during operation of the
instrument.
▶ Avoid soiling and strong fluctuations of the ambient temperature.
▶
Cutting through the measuring line will destroy the instrument and thus
lead to a wrong electrical output signal.
▶
Cutting through the capillary will destroy the instrument and lead to the
leakage of the thermometric liquid (Xylol, Syltherm or silicone oil).
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.
The working pressure at the thermowell stem is permitted up to a maximum of 25 bar
(static).
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.
■
Expose, if possible, the entire length of the stem to the temperature to be measured.
However, at least the length of the active part that corresponds to the length of the
expansion vessel (active length).
■
The temperature probe in pipelines or other measuring points must be angled as far
towards the flow as possible.
■
When using thermowells, please observe that the stem must not touch the bottom of
the thermowell.
■
Protect capillaries against bending. The smallest bending radius of the capillary
should not be less than 6 mm. Any bending or discontinuities of the capillary may
result in the failure of the instrument.
■
If the sensor is is installed in a location which is exposed to shock and vibration, it
is essential that the capillary is coiled in several loops between the last attachment
point and the sensor, and free from tension. Any excess length must also be coiled,
since cutting would render the instrument unserviceable.
■
Avoid welding or soldering and permanent fastening of the capillary as this could
seriously damage the capillary and impair the operation of the instrument.
■
The dial casing must be mounted free from vibration.
■
If necessary, it is possible to isolate the instrument from the mounting point by instal-
ling a flexible connection line between the measuring point and the thermometer and
mounting the instrument on a suitable bracket.
If this is not possible, do not exceed the following limits:
Frequency range < 150 Hz
Acceleration < 0.7 g (7 m/s 2 )
6. Commissioning, operation