WIKA TR12-M - Handbuch (Seite 12)

GB
14064370.01 08/2013 GB/D
WIKA operating instructions models TR12, TC12 12
4. Design and function
4.1 Description
The model TR12-B (resistance thermometer) and model TC12-B (thermocouple) electrical
thermometers consist of a module (TR12-M, TC12-M) which is built into a certified Ex-d
housing. The module is made up of a spring-loaded measuring insert (TR12-A, TC12-A)
built into a neck tube. The measuring insert (TR12-A, TC12-A) is replaceable.
The active measuring component of the measuring insert is manufactured from a welded
tube or from mineral-insulated cable, optionally in combination with ceramic-insulated
thermocouple wires. The sensor is embedded in ceramic powder, heat-resistant potting
compound, cement compound or thermally conductive paste.
If the temperature sensor is designed as a grounded thermocouple, the thermocouple is
joined directly to the sheath. Designs with a diameter smaller than 3 mm and with grounded
thermocouples should be considered as galvanically connected with earth potential.
The connection side of the measuring insert consists of a transition sleeve with connected
connection wires.
CAUTION!
Thermometers of this model range must be installed with a thermowell. The
design of the thermowell can be selected as desired, but the operational
process data (temperature, pressure, density and flow rate) must be taken into
account.
Possible sensor measuring ranges:
Model TR12: -200 ... +600 °C
Model TC12: -40 ... +1,200 °C
The following mounting and operating information has been compiled with care. However, it
is not possible to consider all potential usage cases.
4. Design and function