Michell Instruments WM281 Manual de usuario

WM281/291

Premium Wall Mount

RH & Temperature Transmitters’

User’s Manual

97463 Issue 1

July 2014

4 . 5

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



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

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

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

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



This document is the property of Michell Instruments Ltd. and may not be copied or

otherwise reproduced, communicated in any way to third parties, nor stored in any Data

Processing System without the express written authorization of Michell Instruments Ltd.





WM281/291 Transmitters

WM281/291 User’s Manual

 

Contents

















 

 3

  3

  3

  4

  4

  

  

  

  

  6

  6

  6

  7

  7

  7

 

  

  

  9

 

  

  

  

 

  

Figures

 3

 4

 

 

WM281/291 User’s Manual

 

Appendices

 

 

  

 

 

 

  

 

 

  

 

 

 

  

 

 

 34

WM281/291 User’s Manual

 

Safety

             

                





              

               



Electrical Safety





Toxic Materials









Repair and Maintenance





Calibration







Safety Conformity



WM281/291 User’s Manual

 

Abbreviations



  

  

  

3  

  

  

  

  

  

  

  

  

  

  

Warnings





Where this hazard warning symbol appears in the following

sections it is used to indicate areas where potentially hazardous

operations need to be carried out.

Where this symbol appears in the following sections it is used to

indicate areas of potential risk of electric shock.

WM281/291 User’s Manual

 

INTRODUCTION

1 INTRODUCTION







 

 

 

 



















 

 

 

 

 





Dew point









WM281/291 User’s Manual



INTRODUCTION

Frost point







Absolute humidity



3

Mixing ratio ( or title)





Specic enthalpy (heat content)







WM281/291 User’s Manual

 3

INstallatIoN

2 INSTALLATION

2.1 Unpacking the Instrument





 

 

 

 

2.2 Choice of the Site of Installation

             









 

 





0 55 70 80 85-28

100

RH%

Temp °C





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