The applicable directives can be found in the EU conformity declaration of the specic device.
3.1.4 Improper device modications
WARNING
Improper device modications
Risk to personnel, system and environment can result from modications to the device,
particularly in hazardous areas.
• Only carry out modications that are described in the instructions for the device. Failure to
observe this requirement cancels the manufacturer's warranty and the product approvals.
3.2 Requirements for special applications
Due to the large number of possible applications, each detail of the described device versions for
each possible scenario during commissioning, operation, maintenance or operation in systems
cannot be considered in the instructions. If you need additional information not covered by
these instructions, contact your local Siemens oce or company representative.
Note
Operation under special ambient conditions
We highly recommend that you contact your Siemens representative or our application
department before you operate the device under special ambient conditions as can be
encountered in nuclear power plants or when the device is used for research and development
purposes.
3.3 Use in hazardous areas
Qualied personnel for hazardous area applications
Persons who install, connect, commission, operate, and service the device in a hazardous area
must have the following specic qualications:
• They are authorized, trained or instructed in operating and maintaining devices and systems
according to the safety regulations for electrical circuits, high pressures, aggressive, and
hazardous media.
• They are authorized, trained, or instructed in carrying out work on electrical circuits for
hazardous systems.
• They are trained or instructed in maintenance and use of appropriate safety equipment
according to the pertinent safety regulations.
Safety notes
3.3 Use in hazardous areas
SITRANS TH100/TH320/TH420/TR320/TR420/TF320/TF420 with 4 to 20 mA/HART
28 Operating Instructions, 05/2020, A5E41864807-AB
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