WARNING
Incorrect material for the diaphragm in Zone 0
Risk of explosion in the hazardous area. If operated with intrinsically safe supply devices of
category "ib" or devices of the flameproof enclosure version "Ex d" and simultaneous use in
Zone 0, pressure transmitter explosion protection depends on the tightness of the diaphragm.
● Ensure that the material used for the diaphragm is suitable for the process medium. Refer
to the information in the section "Technical data (Page 199)".
WARNING
Loss of safety for devices with "flameproof enclosure" type of protection
Risk of explosion in hazardous areas. An explosion may be caused by hot gas escaping from
the flameproof enclosure if there is too little space between it and fixed parts (e.g. walls, pipes).
● Ensure that there is a minimum clearance of at least 40 mm between the flameproof joints
and the fixed parts.
①
Flameproof joint
WARNING
Using safety extra-low voltage for devices of the protection type "db", "ec", "tb" or "tc"
Risk of explosion in hazardous areas.
● Isolate the non-intrinsically safe circuit safely from ground, e.g.: through a SELV circuit.
Installing/mounting
5.1 Basic safety instructions
SITRANS P320/P420 with 4 to 20 mA/HART
44
Operating Instructions, 11/2019, A5E44852162-AC