Siemens Pacemaker UM344-2 Manuel d'utilisateur Page 183

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USER’S MANUAL ADDENDUM
UMA344-2-2
Issue: 1
March 1997
Ex N INSTALLATION CONDITION
INVOLVED USER’S MANUAL
UM344-2, Issue 1, XTC™ Transmitters, Series 344 Temperature Transmitters, User’s Manual
ADDITIONAL MATERIAL
The voltage at the loop terminals of a Model 344 installed in an area requiring an Ex N rating must be prevented from
exceeding 42 Vdc. This can be accomplished by:
A double wound mains transformer to BS3535 or equivalent
An adequately rated zener diode
An adequately rated semiconductor voltage regulator
Powering the loop from a battery
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