Siemens SITRANS TH400, Operating Instructions Manual

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Connecting
5.1 Safety information on connecting up
SITRANS TH400
20
Operating Instructions, 06/2010, A5E01018688-02
5.1.2 Safety notes when connecting in hazardous areas
WARNING
Observe the degree of protection
The device must be connected to the supply and signal circuits named in the certificate or
on the nameplate.
When installing the device in hazardous areas, use housings/connection heads with the
degree of protection corresponding to the inspection certificate valid in your country.
WARNING
Electrical connection in hazardous areas
The national directives and laws for hazardous areas valid in your country must be
observed for electrical connection. In Germany these are, for example:

The health and safety at work regulations

The directive for "Installation of electrical systems in hazardous areas", DIN EN 60079-
14 (previously VDE 0165,T1)
 The EC type examination certificate
When a auxiliary power supply is needed, check whether the auxiliary power supply
matches that given on the nameplate and with the inspection certificate valid in your
country.
CAUTION
Limited range of use
If the device has been operated outside the ambient conditions specified for potentially
explosive atmospheres, you may no longer operate the device in potentially explosive
atmospheres. Make sure to permanently mask all Ex markings on the nameplate.
NOTICE
Loss of type of protection "Intrinsic safety"
If the transmitter is not operated with an intrinsically-safe power supply, the type of
protection "Intrinsic safety" is no longer guaranteed and the intrinsically-safe approval may
be revoked.
Permanently erase, therefore, the irrelevant types of protection on the nameplate before
commissioning to ensure that erroneous deployment is avoided.
Note
Be sure to observe the inspection certificates valid in your country.
The input circuit is thus electrically isolated from the sensor circuit. The isolation does not
satisfy the requirements for infallible electrical isolation in the sense of the intrinsic safety
standard EN / IEC 60079-11, but does withstand a test voltage of 500 V AC/1 minute.