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WIKA mw series - User Manual

WIKA mw series
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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
A
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

Table of Contents

Questions and Answers

  • W
    williamlaraAug 3, 2025
    What to do if WIKA mw has no actuation or undue actuation?
    • A
      Andrea JohnsonAug 3, 2025
      If your WIKA Switch isn't actuating or is actuating at the wrong times, several factors could be at play. First, ensure that the root valve is open. A closed valve will prevent proper operation. If the valve is open, check the microswitch contacts for damage and replace the microswitch if needed. Also, inspect all electrical joints to ensure they are secure. Finally, verify the condition of the electrical line, looking for interruptions or short circuits.
  • J
    Jennifer MayoAug 8, 2025
    Why is my WIKA Switch responding slowly?
    • D
      Douglas ReeseAug 8, 2025
      Slow response in a WIKA Switch can stem from a few issues. Start by checking the connection line for clogs or obstructions and clean it if necessary. Also, ensure that the root valve is fully open. If the fluid is too viscous, consider providing the instrument with a suitable fluid separator.
  • J
    Joshua HoAug 15, 2025
    How to fix set point shift on WIKA mw Switch?
    • A
      Angela MorenoAug 15, 2025
      If you notice a set point shift in your WIKA Switch, it could be due to several reasons. The sensitive element might have undergone permanent deformation due to fatigue or overages; in this case, recalibrate or replace it. Chemical corrosion could also alter the elastic features of the sensitive element; consider replacing it with one made of a more suitable material or applying a fluid separator. For MWH and MAH models, O-ring wear could be the culprit; replace the piston subgroup and recalibrate.
  • A
    anitalevyAug 21, 2025
    What to do if WIKA mw has poor repeatability?
    • C
      Christine JimenezAug 21, 2025
      Poor repeatability in a WIKA Switch, specifically MWH and MAH models, can be caused by O-ring wear. The suggested solution is to replace the piston subgroup and recalibrate. Also, air bubbles or condensation may cause poor repeatability (only for types with pressure
  • E
    erikarussoAug 27, 2025
    Why does WIKA mw have undue actuation?
    • E
      Erin RamirezAug 28, 2025
      Undue actuation in a WIKA Switch can be caused by accidental shocks or excessive mechanical vibrations. To resolve this, modify the mounting to reduce these disturbances.

Summary

Operating Principle

Set Point Regulation

Set Point Calibration

6.1 Preliminary Operations

6.2 Calibration Circuit and Operations

Details on setting up the calibration circuit and performing basic operations.

6.3 Calibration of Instrument with Sensing Element H and G

6.4 Check of Set Point

6.5 Adjustment of Dead Band

How to adjust the dead band on specific microswitch types.

6.6 Final Operations

Mounting and Connections

7.1 Mounting

7.3 Pressure Connections

Guidelines for making process fluid connections, including valves.

7.5 Electrical Connections

Instructions for wiring the instrument, including safety standards.

7.6 Grounding Connections

Instructions for proper electrical grounding of the instrument.

Safety Integrity Level (SIL) Installation Requirements

Putting Into Operation

Functional Verification

Stopping and Dismounting

Troubleshooting

Annex 1 - Model Code

WIKA mw series Specifications

General IconGeneral
TypeMechanical pressure switch
Ingress ProtectionIP65
FunctionPressure monitoring and switching
Housing MaterialStainless steel
Process ConnectionG ¼ A DIN 3852-E, ¼ NPT, G ½ A DIN 3852-E, ½ NPT
Electrical ConnectionCable gland or plug connector
Switching VoltageMax. 250 V AC/DC
Protection classIP65
Contact configurationSPDT (Single Pole Double Throw)

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