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DIAPHRAGM PRESSURE SWITCHES
WEATHERPROOF AND INTRINSICALLY SAFE: MODEL MW
Versions: MWB-MW-MWH-MWG
A
= pressure attachment
B
= cable entry
For surface mounting use two screws M6
WEIGHT 1,8 kg
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
2
3
4
5
6
7
8
9
10
11
12
13
14
15
SAFETY INSTRUCTIONS FOR USE IN HAZARDOUS ATMOSPHERES.
RECOMMENDATIONS FOR PRESSURE SWITCH SAFE USE.
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.
INSTRUCTION MANUAL
Dimensions in mm
FLAMEPROOF: MODEL MA
Versions: MAB-MA-MAH-MAG
A
= pressure attachment
B
= cable entry
For surface mounting use four screws M6
WEIGHT 3,2 kg
RELATED DOCUMENT
To authentified document with certificate
N° IECEx PRE 16.0067X
N° IECEx PRE 16.0074X
NI-221WE
REV. 5 12/16
Dimensions in mm
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Table of Contents
Related Manuals for WIKA mw series
Summary of Contents for WIKA mw series
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Page 1: Table Of Contents
NI-221WE INSTRUCTION MANUAL REV. 5 12/16 DIAPHRAGM PRESSURE SWITCHES WEATHERPROOF AND INTRINSICALLY SAFE: MODEL MW FLAMEPROOF: MODEL MA Versions: MWB-MW-MWH-MWG Versions: MAB-MA-MAH-MAG = pressure attachment = pressure attachment = cable entry = cable entry For surface mounting use two screws M6 For surface mounting use four screws M6 WEIGHT 1,8 kg Dimensions in mm... -
Page 2: General Notes
NI-221WE INSTRUCTION MANUAL Rev. 5 12/16 The following table gives the relationship between hazardous ar- GENERAL NOTES eas, Atex Categories and Equipment Protection Level (EPL) listed FOREWORD on the flameproof instrument nameplate The wrong choice of a model/ version, as well as the incorrect in- Categories ac- stallation, lead to malfunction and reduce instrument life. - Page 3 NI-221WE INSTRUCTION MANUAL Rev. 5 12/16 The pressure switch must be mounted in the normal installation Fig. 3 - Calibration circuit position, i.e. with the pressure connection pointing downwards. Avoid forcing the elastic support of the microswitch by hand or with tools.
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Page 4: Mounting And Connections
NI-221WE INSTRUCTION MANUAL Rev. 5 12/16 6.5.1 Calibration of dead band The calibration of the dead band is obtained using the following Fig. 7 – Instrument with diaphragm seal procedure: 1 - Raise pressure in the circuit until reaching the set point and record its value (Pi). -
Page 5: Instrument Plumbing
NI-221WE INSTRUCTION MANUAL Rev. 5 12/16 CAUTION: fittings used for the electrical connection of the flame- Fig. 13 – Free connector assembly proof instruments shall be certified according the IEC or EN stand- ards and shall guarantee instrument degree of protection (IP66). In the case of Gk threads, this is made in accordance with standard UNI-EN 60079-1 (Italian national variant). -
Page 6: Putting Into Operation
NI-221WE INSTRUCTION MANUAL Rev. 5 12/16 PUTTING INTO OPERATION FUNCTIONAL VERIFICATION The instrument comes into operation as soon as is energized and This will be carried out according to the Customer’s control proce- the root valve is opened. Any possible drainage of the connection dures. -
Page 7: Troubleshooting
NI-221WE INSTRUCTION MANUAL Rev. 5 12/16 TROUBLESHOOTING IMPORTANT NOTE: operations involving replacement of essential components must be carried out at our workshop, especially for instruments with flameproof certificate; this is to guarantee the user the total and correct restoration of the product original characteristics. - Page 8 NI-221WE INSTRUCTION MANUAL Rev. 5 12/16 Fig. 18 – Wall mounting Model MW Model MA Screws M6x A – Process connection B – Electrical connection Fig. 19 – Rack mounting Model MW Model MA Fig. 20 – Direct mounting Threaded Flanged Model MW...
- Page 9 Silver + Argon sealed Gold Gold + Argon sealed Silver adjustable dead band Options Example: Intrinsic Safety execution WIKA Alexander Wiegand SE & Co. KG Alexander-Wiegand-Straße 30 63911 Klingenberg • Germany Tel. +49 9372 132-0 Fax +49 9372 132-406 info@wika.de...