WIKA TR21 Mode D'emploi page 8

3. Safety
3.2 Intended use
The model TR21 resistance thermometer has been specifically designed for the
measurement of temperatures in vessels or pipes, in the range of -30 ... +150 °C
(-22 ... +302 °F) or -30 ... +250 °C (-22 ... +482 °F), which are used in sanitary applications.
EN
Here, the thermowell is used to protect the temperature sensor from the process
conditions. Furthermore, the detachable connection from the thermowell in the TR21-A
and TR21-B variants enables the removal of the temperature sensor without having to shut
down the process; and thus guards against any damage to the environment or to personnel
which might be caused by escaping process media.
Neither repairs nor structural modifications are permitted, and any would void the
guarantee and the respective certification. The manufacturer shall not be responsible for
constructional modifications after delivery of the instruments.
The instrument has been designed and built solely for the intended use described here,
and may only be used accordingly.
The technical specifications contained in these operating instructions must be observed.
Improper handling or operation of the instrument outside of its technical specifications
requires the instrument to be taken out of service immediately and inspected by an
authorised WIKA service engineer.
The manufacturer shall not be liable for claims of any type based on operation contrary to
the intended use.
3.3 Responsibility of the operator
The system operator is responsible for selecting the thermometer or thermowell, and for
the selection of their materials, so as to guarantee their safe operation within the plant or
machine. When preparing a quote, WIKA can only give recommendations which are based
on our experience in similar applications.
The safety instructions within these operating instructions, as well as the safety, accident
prevention and environmental protection regulations for the application area must be
maintained.
The operator is obliged to maintain the product label in a legible condition.
8 WIKA operating instructions model TR21