Siemens SITRANS TH400, Operating Instructions Manual, Page: 21 / 62

Connecting
5.1 Safety information on connecting up
SITRANS TH400
Operating Instructions, 06/2010, A5E01018688-02
21
Zone 0 and Zone 1 in type of protection "i" - intrinsic safety
● Only connect the transmitter, in accordance with the certificate of compliance, to devices
certified as intrinsically-safe.
● If the connection head is made of aluminum, the requirements of EN 60079-26, section
4.3.3, must be observed for uses where the device category 1 G is required.
● Be sure to observe the permissible electrical parameters specified in the test certificate.
Zone 2 in type of protection "nL" - limited energy resources
● Install the transmitter in a housing meeting the degree of protection IP54 per EN 60529,
e.g. in a type B connection head per DIN 43729.
● Connect the transmitter only to devices that have been approved as "nL" certified devices
(limited energy resources) in category 3.
● Be sure to observe the permissible electrical parameters specified in the test certificate.
Zone 2 in type of protection "nA" - non-sparking resources
● Install the transmitter in a housing meeting the degree of protection IP54 per EN 60529,
e.g. in a type B connection head per DIN 43729.
● Adhere to the conditions for installers applicable to this type of protection.
● The maximum approved input voltage is U
n
= DC 32 V.
● Take measures to ensure that the supply voltage (including transients) does not rise
above 140 % of the rated voltage.
Additional requirements for use in dust explosion protected areas
Install the transmitter in an enclosure suitable for the respective type of dust and
corresponding Zone in accordance with the inspection certificate valid in your country.