WIKA MH-4 User manual
Operating instructions
Betriebsanleitung
Mode d‘emploi
Manual de instrucciones
EN
DE
FR
ES
Pressure sensor, model MH-4
Drucksensor, Typ MH-4 Seite 20 - 37
Capteur de pression, type MH-4 Page 38 - 55
Sensor de presión, modelo MH-4 Seite 56 - 73
Pressure sensor, model MH-4 Page 2 - 19
2WIKA operating instructions pressure sensor, model MH-4
EN
14170805.04 11/2023 EN/DE/FR/ES
© 03/2023 WIKA Alexander Wiegand SE & Co. KG
All rights reserved.
WIKA®is a registered trademark in various countries.
Contents
Contents
1. General information 3
2. Design 3
3. Safety 4
4. Mounting 6
5. Faults 9
6. Maintenance 10
7. Dismounting, return and disposal 11
8. Specications 12
Declarations of conformity can be found online at www.wika.com.
3
WIKA operating instructions pressure sensor, model MH-4
EN
14170805.04 11/2023 EN/DE/FR/ES
1. General information / 2. Design
1. General information
Prior to starting any work, read the operating instructions! Keep for later use!
These operating instructions contain important information on handling the instrument.Working safely requires that
all safety instructions and work instructions are observed.
shall prevail.
The general terms and conditions of WIKA Alexander Wiegand SE & Co. KG shall apply.
Further information:
- Internet address: www.wika.de / www.wika.com
- Data sheet: PE 83.02
- Technical information: IN 00.14 Tapped holes for process connections
IN 00.50 Electrical mounting
2. Design
2.1 Overview
Electrical connection
Case
Process connection, thread
4WIKA operating instructions pressure sensor, model MH-4
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14170805.04 11/2023 EN/DE/FR/ES
3. Safety
3. Safety
3.1 Explanation of symbols and terms
WARNING!
... indicates a potentially dangerous situation that can result in serious injury or death, if not avoided.
CAUTION!
... indicates a potentially dangerous situation that can result in light injuries or damage to property or
the environment, if not avoided.
Information
3.2 Intended use
The model MH-4 is a pressure sensor that is used for pressure measurement in mobile working machines.
The pressure sensor may only be used in such applications as are within its technical performance limits, in particular
with regard to its material resistance limit, leakage rate limits and permissible temperature and pressure limits.
It is the sole responsibility of the manufacturer or operator of a machine or plant to ensure the suitability of the pressure
sensor, and its media resistance, within the application through proper choice of materials and maintenance cycles.
mainly used for cooling, lubrication, cleaning or power transmission in industrial machines.
The mounting, dismounting, installation, parameterisation and maintenance of the pressure sensor in industrial
The instrument has been designed and built solely for the intended use described here, and may only be used
accordingly.
The manufacturer shall not be liable for claims of any type based on operation contrary to the intended use.
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WIKA operating instructions pressure sensor, model MH-4
EN
14170805.04 11/2023 EN/DE/FR/ES
3. Safety
3.3 Improper use
instrument are not permissible.
Safety or emergency shutdown devices
Hazardous areas
Abrasive or viscous media and applications with hydrogen and oxygen
Processes with high condensation
3.4 Personnel qualification
Skilled personnel
Skilled personnel, authorised by the operator, are understood to be personnel who, based on their technical training,
regulations, current standards and directives, are capable of carrying out the work described and independently
recognising potential hazards.
WIKA operating instructions pressure sensor, model MH-4
EN
14170805.04 11/2023 EN/DE/FR/ES
3. Safety / 4. Mounting
3.5 Labelling safety markings
Product label
Measuring range Pin assignment
Article number Output signal Coded date of manufacture
Serial number Auxiliary power Voltage supply
Before mounting and commissioning the instrument, ensure you read the operating instructions!
DC voltage
Do not dispose of with household waste. Ensure a proper disposal in accordance with national
regulations.
4. Mounting
4.1 Mechanical mounting
Only use the pressure sensor if it is in perfect condition with respect to safety.
Prior to commissioning, the pressure sensor must be subjected to a visual inspection.
Obvious damage must be reported immediately.
WIKA operating instructions pressure sensor, model MH-4
EN
14170805.04 11/2023 EN/DE/FR/ES
4. Mounting
Mounting the instrument
please contact our application consultant.
instructions.
1. Seal the sealing faces.
2.At the mounting point, screw the pressure sensor in hand-tight.
3.
Hexagon at the case, spanner width 22 mm:
- Open-ended spanner: 30 Nm ±5 %
- Socket wrench: 50 Nm ±5 %
- Open-ended spanner: 50 Nm ±5 %
- Socket wrench: 50 Nm ±5 %
Operation with version MH-4 (v) with vented electrical output
The instruments must not be sealed at the venting, e.g. painted over, otherwise the pressure compensation to the
environment is not guaranteed and the accuracy cannot be maintained.
into case
≈35
[1.38]
⬡22
the process connection
≈55
[2.17]
⬡27
8WIKA operating instructions pressure sensor, model MH-4
EN
14170805.04 11/2023 EN/DE/FR/ES
4. Mounting
The following must be observed when using the vented electrical connection: Avoid contact of the electrical connection
with diesel fuel.The installation conditions for the pressure sensor must be selected so that contact with extremely
For information on tapped holes and welding sockets, see technical information IN 00.14 at www.wika.com
4.2 Electrical mounting
Voltage supply
For auxiliary power, see product label
For further details on electrical mounting, see technical information IN 00.50
installation standard.
ForinstrumentswithNorthAmericancerticationperUL/CSAIEC61010-1:
should the pressure sensor be used at this altitude.
Shielding and grounding
The instrument must be grounded via the process connection.
Properly integrate the instrument into the vehicle's grounding concept. With vehicle makes using a 12 V or 24 V
electrical system, connect the battery ground to the bodywork.The pressure connection must be connected to the
bodywork ground.
Pin assignment
For pin assignments, see product label
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WIKA operating instructions pressure sensor, model MH-4
EN
14170805.04 11/2023 EN/DE/FR/ES
5. Faults
5. Faults
CAUTION!
Physical injuries and damage to property and the environment
If faults cannot be eliminated by means of the listed measures, the pressure sensor must be taken out
of operation immediately.
Ensure that pressure or signal is no longer present and protect against accidental commissioning.
Contact the manufacturer.
Faults Causes Measures
Plastic has faded No measures required
Discolouration is harmless
No output signal Cable break Check the continuity, and if necessary
exchange the cable
No/wrong auxiliary power Correct the auxiliary power
No/wrong output signal Wiring error
Constant output signal upon
change in pressure
Mechanical overload caused by overpressure
contact the manufacturer.
Signal span too small/drops Mechanical overload caused by overpressure
contact the manufacturer.
Seal/sealing face damaged or soiled, seal
Clean the seal/sealing face, replace seal if
applicable
10 WIKA operating instructions pressure sensor, model MH-4
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14170805.04 11/2023 EN/DE/FR/ES
5. Faults / 6. Maintenance
Faults Causes Measures
Signal span varies/inaccurate EMC interference sources in the environment,
e.g., frequency converter
of interference
Operating temperature too high/low
Instrument not grounded Ground the instrument
medium
Deviating zero point signal Operating temperature too high/low
Other mounting position Adjust the zero point
Overload safety exceeded
6. Maintenance
6.1 Maintenance
This pressure sensor is maintenance-free.
6.2 Cleaning
Only use commercially available and solvent-free cleaning agents.
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