Table of Contents
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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 ma series
Summarization of Contents
General Notes
Foreword
Introduces the manual's importance and consequences of misuse.
Allowed Overrange
Discusses pressure limits, vacuum, proof pressure, and transitory overages.
Mechanical Vibration
Explains vibration effects and mitigation for instrument longevity.
Temperature
Addresses instrument temperature limits and necessary protective measures.
Set Point Calibration
Preliminary Operations
Steps before calibration, including removing blocking devices for safety.
Weatherproof Pressure Switches (Model MW)
Instructions for removing the blocking device and cover on MW models.
Flameproof Pressure Switches (Model MA)
CAUTION and steps for cover removal on MA models in hazardous areas.
Calibration Circuit and Operations
Details connecting warning lamps and terminal operations (NO/NC).
Calibration of Instrument with Sensing Element H and G
Specific calibration needs for piston sensing elements for high accuracy.
Check of Set Point
Procedure for checking and recording set point values for accuracy.
Adjustment of Dead Band (Letter R)
How to adjust the dead band using a wheel on the microswitch.
Calibration of Dead Band
Step-by-step procedure to calibrate the dead band using pressure changes.
Final Operations
Weatherproof Pressure Switches (Model MW)
Reassembly of cover, gasket, and blocking device for MW models.
Flameproof Pressure Switches (Model MA)
Reassembly of cover and blocking headless screw for MA models.
Mounting and Connections
Mounting
Guidance on surface, panel, or direct mounting and orientation.
Instrument with Diaphragm Seals
How diaphragm seals affect set point and adjustment needs.
Pressure Connections
Essential steps for installing shut-off valves, fittings, and ensuring airtight connections.
Instruments with Process Connection Coated with PTFE
How to use the PTFE coating as a sealing ring for connections.
Electrical Connections
Recommendations for electrical connections, standards, and sealing threads.
Electrical Connections
Connector 7 Poles Type MIL-5015
Preparation and assembly of the MIL-5015 connector for weatherproof instruments.
Instrument Plumbing
Weatherproof Pressure Switches (Model MW)
Describes using wire for tamper-proofing calibration and connections on MW models.
Flameproof Pressure Switches (Model MA)
Notes that plumbing is not needed for MA models due to secure construction.
Visual Inspection
Instrument with Sensor Type H and G
Inspecting O-ring seal wear via an inspection hole for H/G sensor types.
Instruments with Process Connection Coated with PTFE
Inspecting PTFE coating for corrosion using an inspection hole.
Functional Verification
Instrument with Diaphragm Seal or Sensor Type G
Recommends annual inspection for instruments used as max pressure alarms.
Troubleshooting
Set Point Shift Issues
Covers permanent deformation and chemical corrosion affecting set point accuracy.
Poor Repeatability
Addresses issues causing poor repeatability, like O-ring wear.
Slow Response
Identifies air bubbles, blockages, or closed valves leading to slow response.
Actuation Malfunctions
Details causes like damaged microswitches, electrical faults, or line issues.
Vibration-Induced Actuation
Explains how shocks or vibrations can cause undue actuation.
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