WIKA MH-4-CAN User manual
Operating instructions
Betriebsanleitung
Mode d’emploi
Manual de instrucciones
EN
DE
FR
ES
Pressure sensor
Drucksensor, Typ MH-4-CAN Seite 16 - 29
Pressure sensor, model MH-4-CAN Page 2 - 15
Capteur de pression, type MH-4-CAN Page 30 - 43
Sensor de presión, modelo MH-4-CAN Página 44 - 57
3WIKA operating instructions pressure sensor, model MH-4-CAN
EN
14495737.01 03/2023 EN/DE/FR/ES
1. General information
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.
■The general terms and conditions of WIKA Alexander Wiegand SE & Co. KG shall apply.
■Further information:
- Internet address: www.wika.com
- Contact: Tel.: +49 9372 132-0
- Data sheet: PE 83.02
- Declaration of conformity: Online at www.wika.de
- Additional instruction: Special Documentation CANopen
Special Documentation SAE J1939
- Technical information: IN 00.14 “Tapped holes for process connections” at www.wika.com
IN 00.50 “Electrical mounting” at www.wika.com
© 03/2023 WIKA Alexander Wiegand SE & Co. KG
All rights reserved.
WIKA®is a registered trademark in various countries.
4WIKA operating instructions pressure sensor, model MH-4-CAN
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14495737.01 03/2023 EN/DE/FR/ES
2. Short overview / 3. Safety
2. Short overview
2.1 Overview
3. Safety
3.1 Explanation of symbols and terms
WARNING!
The signal word indicates a hazard with a medium degree of risk which, if not avoided, may result in
death or serious injury.
CAUTION!
The signal word indicates a hazard with a low degree of risk which, if not avoided, may result in a minor
or moderate injury.
Electrical connection (depending on version)
Case, spanner ats
Case
Process connection, spanner ats (option)
Process connection, thread
5WIKA operating instructions pressure sensor, model MH-4-CAN
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14495737.01 03/2023 EN/DE/FR/ES
3. Safety
Information
The signal word points out useful tips, recommendations and information for ecient and trouble-free
operation.
3.2 Intended use
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.
→ For performance limits, see chapter 8 “Specications”
The mounting, dismounting, installation, parameterisation and maintenance of the pressure sensor in industrial
environments absolutely requires suitably skilled personnel in accordance with chapter 3.4 “Personnel qualication”.
The model MH-4-CAN has been developed for the pressure measurement of non-hazardous uids, liquids and gases
(classication in accordance with Directive 2014/68/EU Article 13, Regulation (EC) No. 1272/2008, or GHS1)) which
are mainly used for cooling, lubrication, cleaning or power transmission in industrial machines.
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.
3.3 Improper use
Any use beyond or dierent to the intended use is considered as improper use.
The following points, in particular, count as improper use and are not permissible:
■Use of this instrument in safety or emergency shutdown devices
■Unauthorised modications to the pressure sensor
■Use in hazardous areas
■Use with abrasive and viscous media
■Use for refrigeration and air-conditioning applications
■Use in water pumps
6WIKA operating instructions pressure sensor, model MH-4-CAN
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3. Safety
3.4 Personnelqualication
Skilled personnel
Skilled personnel, authorised by the operator, are understood to be personnel who, based on their technical training,
knowledge of measurement and control technology and on their experience and knowledge of country-specic
regulations, current standards and directives, must be capable of carrying out the work described and independently
recognising potential hazards.
3.5 Labelling, safety marks
Product label (example)
Article number Output signal Selectable additional text
Digital serial number Auxiliary power Pin assignment
Serial number Approvals 11 Maximum current supply
Measuring range Coded date of manufacture
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 regula-
tions.
11
7WIKA operating instructions pressure sensor, model MH-4-CAN
EN
14495737.01 03/2023 EN/DE/FR/ES
4. Mounting
4. Mounting
4.1 Mechanical mounting
Only use the pressure transmitter if it is in perfect condition with respect to safety.
Prior to commissioning, the pressure transmitter must be subjected to a visual inspection.
■Leaking liquid is indicative of damage.
■Obvious damage must be reported immediately.
Mounting the instrument
The max. torque depends on the mounting point (e.g. material and shape). If you have any questions,
please contact our application consultant.
→ For contact details, see chapter 1 “General information” or the back page of the operating instructions.
1. Seal the sealing faces.
2.At the mounting point, screw the pressure sensor in hand-tight.
3.Tighten with a torque wrench using the spanner ats.
■Hexagon at the case, spanner width 22 mm:
- Open-ended spanner: 30 Nm ±5 %
- Socket wrench: 50 Nm ±5 %
■Optional hexagon at the process connection, spanner width 27 mm:
- Open-ended spanner: 50 Nm ±5 %
- Socket wrench: 50 Nm ±5 %
Operation with vented electrical output
Hexagon (SW 22) integrated
into case
≈35
[1.38]
⬡22
Additional hexagon (SW 27)
above the process connection
≈55
[2.17]
⬡27
8WIKA operating instructions pressure sensor, model MH-4-CAN
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14495737.01 03/2023 EN/DE/FR/ES
4. Mounting
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.
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 salty ambient
conditions (air, liquids) is avoided.
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 instruments without UL, CSA or cURus approval:
This equipment is intended for operation with low voltages which are separated from the AC 230 V / 50 Hz mains
voltage or voltages greater than AC 50 V or DC 120 V for dry environments. A connection to an SELV circuit is recom-
mended, or alternatively to circuits with a dierent protective measure in accordance with IEC 60364-4-41 installation
standard.
ForinstrumentswithNorthAmericancerticationperUL/CSAIEC61010-1:
The power supply for the pressure sensor must be made via an energy-limited electric circuit in accordance with
section 9.4 of UL/EN/IEC 61010-1 or UL/EN/IEC 60950-1 or an LPS per UL/EN/IEC 62368-1 or class 2 in accordance
with UL1310/UL1585 (NEC or CEC). The voltage supply must be suitable for operation above 2,000 m should the
pressure sensor be used at this altitude.
Shielding and grounding
The pressure sensor shall be included in the equipotential bonding / grounding of the application via the process
connection.
9WIKA operating instructions pressure sensor, model MH-4-CAN
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14495737.01 03/2023 EN/DE/FR/ES
Since the electrical connection is made of plastic, it is necessary to use a cable with the following shield connection:
Pin assignment
→For pin assignments, see chapter 3.5 “Labelling, safety marks”
→For auxiliary power, see chapter 3.5 “Labelling, safety marks”
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.
▶If a return is needed, please follow the instructions given in chapter 7.2 “Return”.
For contact details, see chapter 1 “General information” or the back page of the operating instructions.
In the event of any faults, rst check whether the pressure sensor is mounted correctly, mechanically and electrically.
4. Mounting / 5. Faults
10 WIKA operating instructions pressure sensor, model MH-4-CAN
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14495737.01 03/2023 EN/DE/FR/ES
Faults Causes Measures
Plastic has faded UV irradiation 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 Rectify the wiring
Constant output signal upon
change in pressure
Mechanical overload caused by overpressure Replace instrument; if it fails repeatedly, contact
the manufacturer.
Signal span too small/drops Mechanical overload caused by overpressure Replace instrument; if it fails repeatedly, contact
the manufacturer.
Sealing/sealing face damaged or soiled,
sealing does not have a tight t, threads
jammed
Clean the sealing/sealing face, replace sealing
if applicable
Signal span varies/inaccurate EMC interference sources in the environment,
e.g., frequency converter
Shield instrument; cable shield; remove source
of interference
Operating temperature too high/low Lower/increase the temperature
Instrument not grounded Ground the instrument
Strongly uctuating pressure of the process
medium
Damping; consulting by the manufacturer
Deviating zero point signal Operating temperature too high/low Lower/increase the temperature
Other mounting position Adjust the zero point
Overpressure limit exceeded Reduce the pressure
5. Faults
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