Siemens UM344-2 사용자 설명서

 
 
 
 

UMA344-2-2 

 

 

 

 

 

 

 

 

 

 

 

Issue: 1  

 

 

 

 

 

 

 

 

 

 

 

March 1997

 

 

 
UM344-2, Issue 1, XTC™ Transmitters, Series 344 Temperature Transmitters, User’s Manual 
 

 
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 

 

•