Siemens SITRANS P300 Operating Instructions Manual page 28

Installation
4.1 Safety information for installation
Notice
External loads may not be allowed to affect the transmitter as this may result in an incorrect
measured value or even destruction of the device. In the worst case scenario, the process
medium will escape.
Warning
"Intrinsically-safe" protection type
Information for operating the intrinsically-safe version in hazardous areas:
Operation is only permissible in certified intrinsically-safe circuits. The transmitter
corresponds to category 1/2 and may be installed in Zone 0.
The EC type examination certificate applies to installation of the device in the walls of
containers and pipes in which explosive gas/air or vapor/air mixtures occur only under
atmospheric conditions (Pressure: 0.8 bar to 1.1 bar; Temperature: -20 °C to +60 °C). The
permitted range of the ambient temperature is to be found in the specifications or, for
explosion-proof devices, in the EC type examination certificate.
The operator may use the device under non-atmospheric conditions outside the limits
specified in the EC type examination certificate (or the certification applicable in the country
of use) at the operator's own risk if safety measures which may be necessary in accordance
with use conditions (explosive mixture) have been taken. The limit values specified in the
general specifications are to be complied with in all cases.
Additional information for zone 0
Additional requirements apply for installation in zone 0:
The installation must be sufficiently tight (IP67 according to EN 60 529). For instance, an
industry standard (e.g. DIN, NPT) threaded connector is suitable.
When operating with intrinsically safe power supplies in category "EEX ia", explosion safety
does not depend on the chemical stability of the isolation membrane.
When operating in Zone 0 with intrinsically safe power supplies in category "EEx ib", a
regular leakage test must be performed to test the seal of the isolation membrane of the
transmitter. Under these operating conditions, the transmitter may only be used for such
combustible gases and liquids for which the seal diaphragm is sufficiently resistant to
chemicals and corrosion.
4-2
SITRANS P300 with HART communication
Operating Instructions, 06/2005, A5E00359579-02