INSTRUCTION MANUAL
NI-221WE
REV. 5 12/16
DIAPHRAGM PRESSURE SWITCHES
All data, statements and recommendations supplied with this manual are based on information believed by us to be reliable. As the
conditions of effective use are beyond our control, our products are sold under the condition that the user himself evaluates such
conditions before following our recommendations for the purpose or use foreseen by him.
The present document is the property of ALEXANDER WIEGAND SE &Co and may not be reproduced in any form, nor used for any
purpose other than that for which it is supplied.
WEATHERPROOF AND INTRINSICALLY SAFE: MODEL MW FLAMEPROOF: MODEL M
Versions: MWB-MW-MWH-MWG Versions: MAB-MA-MAH-MAG
A = pressure attachment
B = cable entry
A = pressure attachment
B = cable entry
For surface mounting use two screws M6
WEIGHT 1,8 kg Dimensions in mm
For surface mounting use four screws M6
WEIGHT 3,2 kg Dimensions in mm
NOTE: dimensions and weights are not binding unless released on certified drawings.
CAUTION
Before installing, using or carrying out maintenance on the instrument it is necessary to read and understand the indications given
in the attached Instruction Manual.
The instrument must only be installed and maintained by qualified personnel.
INSTALLATION IS TO BE CARRIED OUT ONLY AFTER CHECKING THAT INSTRUMENT CHARACTERISTICS ARE
CONSISTENT WITH PROCESS AND PLANT REQUIREMENTS.
The functional features of the instrument and its degree of protection are shown on the identification plate fixed to the case.
CONTENTS:
1
GENERAL NOTES
2 OPERATING PRINCIPLE
3 MODEL CODE
4 IDENTIFICATION PLATE AND MARKINGS
5 SET POINT REGULATION
6 SET POIT CALIBRATION
7 MOUNTING AND CONNECTIONS
8 INSTRUMENT PLUMBING
9 SAFETY INTEGRITY LEVEL (SIL) INSTALLATION REQUIREMENTS
10 PUTTING INTO OPERATION
11 VISUAL INSPECTION
12 FUNCTIONAL VERIFICATION
13 STOPPING AND DISMOUNTING
14 DISPOSAL
15 TROUBLESHOOTING
SAFETY INSTRUCTIONS FOR USE IN HAZARDOUS ATMOSPHERES.
RECOMMENDATIONS FOR PRESSURE SWITCH SAFE USE.
RELATED DOCUMENT
To authentified document with certificate
N° IECEx PRE 16.0067X
N° IECEx PRE 16.0074X
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