Siemens UM344-2 사용자 설명서
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
•