WIKA DMSU22SA User manual

Operating instructions
Betriebsanleitung
EN
DE
Example of model DMSU22SA
In-line process transmitter, hygienic design
Model DMSU22SA
Inline-Prozesstransmitter, Hygienic Design
Typ DMSU22SA

2
14437648.01 08/2023 EN/DE
WIKA operating instructions, model DMSU22SA
EN
DE
© 09/2023 WIKA Alexander Wiegand SE & Co. KG
All rights reserved. / Alle Rechte vorbehalten.
WIKA®is a registered trademark in various countries.
WIKA®ist eine geschützte Marke in verschiedenen Ländern.
Prior to starting any work, read the operating instructions!
Keep for later use!
Vor Beginn aller Arbeiten Betriebsanleitung lesen!
Zum späteren Gebrauch aufbewahren!
Operating instructions, model DMSU22SA Page 3 - 58
Betriebsanleitung, Typ DMSU22SA Seite 59 - 114

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Contents
Contents
1. General information 6
1.1 Explanation of symbols . . . . . . . . . . . . . . . . . . . . . . . 7
2. Design and function 8
2.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.3 Sensor monitoring . . . . . . . . . . . . . . . . . . . . . . . . 9
2.4 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . 10
3. Safety 11
3.1 Intended use . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2 Improper use . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.3 Responsibility of the operator. . . . . . . . . . . . . . . . . . . . 12
3.4 Personnel qualification . . . . . . . . . . . . . . . . . . . . . . 13
3.5 Personal protective equipment . . . . . . . . . . . . . . . . . . . 13
3.6 Labelling, safety marks . . . . . . . . . . . . . . . . . . . . . . 14
3.7 Compliance with 3-A conformity . . . . . . . . . . . . . . . . . . . 16
3.8 Compliance with EHEDG conformity . . . . . . . . . . . . . . . . . 16
4. Transport, packaging and storage 16
4.1 Transport . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.2 Packaging and storage . . . . . . . . . . . . . . . . . . . . . . 17
5. Commissioning, operation 17
5.1 Mechanical mounting . . . . . . . . . . . . . . . . . . . . . . 17
5.1.1 Requirements for mounting point ......................................17
5.1.2 Installation ........................................................18
5.2 Mounting instructions for EHEDG and 3-A . . . . . . . . . . . . . . . 18
5.2.1 Installation regulations for self-draining .................................19
5.3 Electrical mounting . . . . . . . . . . . . . . . . . . . . . . . 19
5.3.1 Requirements for connection cable ....................................19
5.3.2 Opening the case...................................................20
5.3.3 Shielding and grounding .............................................20
5.3.4 Connection........................................................21
5.4 Pin assignments . . . . . . . . . . . . . . . . . . . . . . . . 21
5.5 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . 22
6. Display and operating unit 22
6.1 Design and description . . . . . . . . . . . . . . . . . . . . . . 22
6.2 Accessing/exiting the operating menu . . . . . . . . . . . . . . . . . 23
6.3 Installation/Removal . . . . . . . . . . . . . . . . . . . . . . . 23
6.4 Setting the main display . . . . . . . . . . . . . . . . . . . . . 24
6.5 Setting the additional display . . . . . . . . . . . . . . . . . . . . 24
7. Configuration without display and operating unit 26
7.1 Performing a mounting correction (offset). . . . . . . . . . . . . . . . 26
7.2 Configuration via HARTinterface . . . . . . . . . . . . . . . . . . 27

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8. Configuration via display and operating unit 28
8.1 Configuring pressure measurement . . . . . . . . . . . . . . . . . 28
8.2 Setting the units . . . . . . . . . . . . . . . . . . . . . . . . 29
8.2.1 Setting the pressure unit .............................................29
8.2.2 Setting the temperature unit ..........................................29
8.3 Scaling the measuring range . . . . . . . . . . . . . . . . . . . . 29
8.3.1 Performing a wet adjustment .........................................29
8.3.2 Performing a dry adjustment..........................................30
8.4 Setting the mode . . . . . . . . . . . . . . . . . . . . . . . . 31
8.5 Mounting correction (offset) . . . . . . . . . . . . . . . . . . . . 32
8.5.1 Performing a wet adjustment .........................................32
8.5.2 Performing a dry adjustment..........................................33
8.6 Setting the damping . . . . . . . . . . . . . . . . . . . . . . . 33
8.7 Write protection . . . . . . . . . . . . . . . . . . . . . . . . 34
8.8 Activating/deactivating the write protection . . . . . . . . . . . . . . . 34
8.9 Changing the PIN. . . . . . . . . . . . . . . . . . . . . . . . 34
9. Diagnostic functions 35
9.1 Performing a pressure simulation . . . . . . . . . . . . . . . . . . 35
9.2 Performing a current simulation . . . . . . . . . . . . . . . . . . . 35
9.3 Displaying/resetting drag pointer . . . . . . . . . . . . . . . . . . 36
9.3.1 Drag pointer Pmin/Pmax...........................................................36
9.3.2 Drag pointer PVmin/PVmax........................................................37
9.3.3 Drag pointer Tmin/Tmax . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
9.4 Displaying/resetting operating time . . . . . . . . . . . . . . . . . . 37
10. Detailed settings 38
10.1 Setting the language. . . . . . . . . . . . . . . . . . . . . . . 38
10.2 Marking the measuring location (TAG). . . . . . . . . . . . . . . . . 38
10.2.1 Setting the TAG short................................................38
10.2.2 Setting the TAG long ................................................39
10.3 Setting the alarm signal. . . . . . . . . . . . . . . . . . . . . . 39
10.4 Setting the signal limits . . . . . . . . . . . . . . . . . . . . . . 39
10.5 Setting the contrast of the LC display . . . . . . . . . . . . . . . . . 40
10.6 Restoring factory setting . . . . . . . . . . . . . . . . . . . . . 40
10.7 Setting the HARTcommunication. . . . . . . . . . . . . . . . . . 41
10.7.1 Setting the short address (multidrop mode) .............................41
10.7.2 Activating/deactivating constant current ................................ 41
10.8 Alarm status of diaphragm monitoring . . . . . . . . . . . . . . . . . 42
10.8.1 Alarm message at the display and operating unit .........................42
10.8.2 Alarm signal via HARTcommunication................................43
10.8.3 Alarm signal via current loop.......................................... 43
11. Instrument information 43
11.1 Displaying measuring range . . . . . . . . . . . . . . . . . . . . 43
11.2 Displaying date of manufacture . . . . . . . . . . . . . . . . . . . 44
11.3 Displaying firmware version . . . . . . . . . . . . . . . . . . . . 44
11.4 Displaying serial number . . . . . . . . . . . . . . . . . . . . . 44
Contents

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12. Cleaning, maintenance and recalibration 45
12.1 Cleaning the process transmitter from outside . . . . . . . . . . . . . . 45
12.2 Cleaning wetted parts . . . . . . . . . . . . . . . . . . . . . . 45
12.3 Cleaning in place (CIP) cleaning process. . . . . . . . . . . . . . . . 45
12.4 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . 46
12.5 Recalibration . . . . . . . . . . . . . . . . . . . . . . . . . 46
13. Faults 46
14. Dismounting, return and disposal 47
14.1 Dismounting . . . . . . . . . . . . . . . . . . . . . . . . . 47
14.2 Return . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
14.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
15. Specifications 49
15.1 Display and operating unit, model DI-PT-U . . . . . . . . . . . . . . . 49
15.2 Output signal . . . . . . . . . . . . . . . . . . . . . . . . . 49
15.3 Electrical connections . . . . . . . . . . . . . . . . . . . . . . 50
15.4 Reference conditions per IEC 61298-1 . . . . . . . . . . . . . . . . 50
16. Accessories and spare parts 51
Annex 1: Menu tree, basic setting 52
Annex 1: Menu tree, basic setting 53
Annex 2: Menu tree, display 54
Annex 2: Menu tree, display 55
Annex 3: Menu tree, diagnosis 56
Annex 4: Menu tree, detailed setting 57
Annex 5: Menu tree, info 58
Declarations of conformity can be found online at www.wika.com
Contents

6WIKA operating instructions, model DMSU22SA
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1. General information
■The in-line process transmitter described in the operating instructions has been
designed and manufactured using state-of-the-art technology. All components are
subject to stringent quality and environmental criteria during production. Our manage-
ment systems are certified in accordance with ISO 9001 and ISO 14001.
■These operating instructions contain important information on handling the instrument.
Working safely requires that all safety instructions and work instructions are observed.
■Observe the relevant local accident prevention regulations and general safety regula-
tions for the instrument's range of use.
■The operating instructions are part of the product and must be kept in the immediate
vicinity of the instrument and readily accessible to skilled personnel at any time. Pass
the operating instructions on to the next operator or owner of the instrument.
■Skilled personnel must have carefully read and understood the operating instructions
prior to beginning any work.
■In case of a different interpretation of the translated and the English operating instruc-
tions, the English wording shall prevail.
■The general terms and conditions contained in the sales documentation shall apply.
■Subject to technical modifications.
Further information:
- Internet address: www.wika.de / www.wika.com
- Relevant data sheet: DS 95.03
- Contact: Tel.: [phone]
[e-mail]
1. General information
Supplementary documentation:
▶Please follow all the documentation included in delivery.
With versions for hazardous areas, also follow operating instructions for
diaphragm seal systems, article number 9045830!

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1.1 Explanation of symbols
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.
WARNING!
... indicates a potentially dangerous situation that can result in burns, caused
by hot surfaces or liquids, if not avoided.
DANGER!
... identifies hazards caused by electrical power. Should the safety instructions
not be observed, there is a risk of serious or fatal injury.
Information
... points out useful tips, recommendations and information for efficient and
trouble-free operation.
1. General information

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2. Design and function
2.1 Overview
Display and operating unit Support tube
Case head Sensor tube
Sensor housing Process connection
2.2 Description
The pressure in the sensor tube generates a signal which is processed by the integrated
evaluation electronics and converted into a current signal or a HARTsignal. This signal
can be used for the evaluation, control and regulation of the process.
The sensor tube is a base body that deforms under pressure load in a controlled manner.
This allows the principle of resistive pressure measurement to be used, in which the
pressure-dependent extent of the deformation is measured with 4 metal strain gauges.
If the sensor tube deforms under the influence of pressure, the strain gauges are also
deformed correspondingly. The electric resistance increases or decreases proportion-
ally to the deflection (elongation or compression).To accurately measure the resistance
change, the strain gauges are wired to a Wheatstone bridge.







2. Design and function

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2.3 Sensor monitoring
The integrated monitoring is used for the electrical signal transmission of the sensor
status. If the sensor breaks, the pressure in the evacuated chamber between the support
tube and the sensor tube changes. On a deviation of 100 mbar, a first electrical or digital
warning signal is issued. On a deviation of 300 mbar, another electrical alarm signal
follows.
Version with HART(4 ... 20 mA with HART®signal)
The instrument can communicate with a controller (master). Both the measured values of
the process and the alarm status are transmitted.
Version with current loop (4 ... 20 mA analogue signal)
If the sensor breaks, the instrument transmits the measured values via the current loop or
the analogue error signal.
→ See chapter 10.8 “Alarm status of diaphragm monitoring” for signal processing within
the process transmitter.
Measuring range scaling (turndown)
The start and end of the measuring range can be set within defined ranges.
Display and operating unit
The main and additional display are displayed in the display and operating unit.
The settings for the main and andditional display are versatile. In the factory setting, the
main display shows the pressure value of the output signal and the additional display
shows the temperature at the sensor tube.
The process transmitter can be configured via the display and operating unit.
Adaptable to mounting position
The process transmitter is fitted with a case head which can be turned through 330°.
The display and operating unit can be attached in 90° steps. Thus the measured values
can be read irrespective of the mounting position.
The instrument may only be installed in horizontal or vertical pipelines.
330°
Rotatable case head
2. Design and function

10 WIKA operating instructions, model DMSU22SA
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The following illustration is intended to clarify the permissible mounting positions.
Observe the instructions in chapter 5.2.1 „Installation regulations for self-draining“.
2.4 Scope of delivery
■In-line process transmitter
■Operating instructions
■Test report
■Ordered accessories
Cross-check scope of delivery with delivery note.
Permissible mounting positions
Horizontal pipeline
Case head above (12 o'clock) Case head below (6 o'clock)
Vertical pipeline
Case head left (9 o'clock) Case head right (3 o'clock)
2. Design and function

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3. Safety
3.1 Intended use
The inline process transmitter, model DMSU22SA, is used to measure relative pressure,
absolute pressure or vacuum and +/- measuring ranges in food production and in
pharmaceutical plants.The physical quantity pressure is converted into an electrical
output signal. Depending on the selected version, the output signal is “4 ... 20 mA with
HART® signal” or a “4 ... 20 mA” current loop.
The instrument has integrated sensor monitoring that can detect a leakage in the sensor
tube and transmit the resulting alarm status. The alarm signal is output either via the
HARTprotocol or as an error signal on the current loop.
Only use the instrument in applications that lie within its technical performance limits (e.g.
max. ambient temperature, material compatibility, ...). Only operate the instrument with
media that cannot damage the wetted parts or diffuse through them. Only use the instru-
ment in compliance with chapter 5.2.1 “Installation regulations for self-draining”.
→ For performance limits, see chapter 15 “Specifications”.
Instrument versions without Ex marking are not approved for use in hazardous areas!
With versions for hazardous areas, also follow the additional operating instructions, article
number 14600275!
The instrument has been designed and built solely for the intended use described here,
and may only be used accordingly.
The technical specifications contained in these operating instructions must be observed.
Improper handling or operation of the instrument outside of its technical specifications
requires the instrument to be taken out of service immediately and inspected by an
authorised WIKA service engineer.
The manufacturer shall not be liable for claims of any type based on operation contrary to
the intended use.
Should the operating instructions not be observed or complied with, approvals
(e.g. EHEDG) can become invalid.
3. Safety

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3.2 Improper use
WARNING!
Injuries through improper use
Improper use of the instrument can lead to hazardous situations and injuries.
▶Refrain from unauthorised modifications to the instrument.
▶Do not use the instrument within hazardous areas.
▶Do not use the instrument as a climbing aid.
Any use beyond or different to the intended use is considered as improper use.
Do not use this instrument in safety or emergency shutdown devices.
3.3 Responsibility of the operator
The instrument is used in the industrial sector. The operator is therefore responsible for
legal obligations regarding safety at work.
The safety instructions within these operating instructions, as well as the safety, accident
prevention and environmental protection regulations for the application area must be
maintained.
The operator is obliged to maintain the product label in a legible condition.
To ensure safe working on the instrument, the operator must ensure the following:
■The instrument is suitable for the particular application in accordance with its
intended use.
■The requisite personal protective equipment is provided.
WARNING!
Risk of injury when recommissioning after an external fire
The materials used cannot withstand temperatures in the event of an external
fire.
▶The instrument must be replaced professionally.
On the wetted parts of the instrument, small residual amounts of the adjust-
ment medium (e.g. compressed air, water) can adhere from production.With
increased requirements for technical cleanliness, suitability for the application
must be checked by the operator before commissioning.
Frequent temperature changes and aggressive, abrasive or highly viscous
media can reduce the service life of the instrument.This can lead to failure of
the instrument.The operator must therefore replace the instrument in a timely
and regular manner.
3. Safety

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3. Safety
3.4 Personnel qualification
WARNING!
Risk of injury should qualification be insufficient
Improper handling can result in considerable injury and damage to property.
▶The activities described in this document may only be carried out by skilled
personnel who have the qualifications described below.
Skilled electrical personnel
Skilled electrical personnel are understood to be personnel who, based on their techni-
cal training, know-how and experience as well as their knowledge of country-specific
regulations, current standards and directives, are capable of carrying out work on electri-
cal systems and independently recognising and avoiding potential hazards.The skilled
electrical personnel have been specifically trained for the work environment they are
working in and know the relevant standards and regulations. The skilled electrical person-
nel must comply with current legal accident prevention regulations.
Special operating conditions require further appropriate knowledge, e.g. of aggressive
media.
3.5 Personal protective equipment
The personal protective equipment is designed to protect the skilled personnel from
hazards that could impair their safety or health during work. When carrying out the various
tasks on and with the instrument, the skilled personnel must wear personal protective
equipment.
Follow the instructions displayed in the work area regarding personal protective
equipment!
The requisite personal protective equipment must be provided by the operator.
Wear safety goggles!
Protect eyes from flying particles and liquid splashes.
Wear protective gloves!
Protect hands from friction, abrasion, cuts or deep injuries and also from
contact with hot surfaces and aggressive media.
Wear safety shoes!
Protect feet from falling objects or objects lying around, as well as against
toxic or hazardous liquids and aggressive media.

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3.6 Labelling, safety marks
Product label
1In-line process transmitter model
2Conformity marking
3Process transmitter order code
4i# serial number, date of manufacture YYYY-MM
5Hardware and firmware versions
6QR code with link to product pass
Additional product label, only for Ex versions
1Process connection, nominal width, pressure
rating
4Certification reference, if available
2Material of wetted parts 5Type examination certificate no.
3Ex marking
If applicable, the instrument is marked with additional product labels for special versions
(e.g. 3A).
7P# Product no.
8Note on permissible temperatures and maximum
permissible temperature TS
9Manufacturer/address
10 Importer for UK
11 Pin assignment
12 Measuring range and maximum allowable
pressure PS
0 ... 16 bar abs (PS 16 bar abs) UPT-20-AIB-XX-XX-XXXXX-XXXXXX-XX
Made in Germany
WIKA Alexander Wiegand SE & Co. KG, 63911 Klingenberg, Germany
4 ... 20 mA /HART
DC 12 ... 30 V
+ : L+ - : L-
i# AAAAAAA1111 2014-10
P# 12345678901 HW 1.1.0 FW 1.2.2
Process/Ambient Temperature:
see manual and approval documents
Process Temperature TS:
DMSU2XSA
T3: +150 C
T4: +xx C
WIKA Instruments Ltd Sevenoaks TN14 5GY / UK
1 2
3
4
5
6
7
9
10
11
12
8
BVS 15 ATEX E 001 X
IECEx BVS 15.0001X
XXX XXUKEXXXXXX
II 1/2G Ex ia IIC T6 ... T3 Ga/Gb
DIN 32676 DN 1/2" PN16 ID9,4
1.4435/316L
1 2
3
4
5
3. Safety

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Product label, display and operating unit
1Display and operating unit model 3Date of manufactureYYYY-MM
2S# Serial no. 4Model code of the display and operating unit
The Ex marking is not valid if the display and operating unit is used in conjunction with
process transmitters without Ex marking.
Symbols
Before mounting and commissioning the instrument, ensure you read the
operating instructions!
Output signal
Auxiliary power
Do not dispose of with household waste. Ensure a proper disposal in accord-
ance with national regulations.
Fulfilment of special recommendations
NE32 Fulfils the securing of information storage in the event of a power failure
NE43 Fulfils the standardisation of the signal level for the failure information from
digital transmitters with analogue output
NE53 Fulfils the requirement for traceability of the software versions of field instru-
ments
NE107 Fulfils the self-monitoring and diagnostics of field instruments
Made in Germany
WIKA A. Wiegand SE & Co. KG D-63911 Klingenberg
DI-PT
DI-PT-UYZZZ-Z
1 2
3
4
3. Safety

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3.7 Compliance with 3-A conformity
For a 3-A-compliant connection, the following seals have to be used:
■For milk thread fittings per DIN 11851, suitable profile seals have to be used (e.g. SKS
Komponenten BV or Kieselmann GmbH).
■For fittings per IDF, seals with support ring per ISO 2853 have to be used.
Note: Connections per Svensk Standard SS 1145, APV RJT and NEUMO Connect S are
not 3-A-compliant.
3.8 Compliance with EHEDG conformity
For an EHEDG-compliant connection, seals in accordance with the current EHEDG
policy document must be used.
Seals for connections per ISO 2852, DIN 32676 and BS 4825 part 3 are, e.g., manufac-
tured by Combifit International B.V.
A manufacturer of seals for connections per DIN 11851 is, e.g., Kieselmann GmbH.
A manufacturer of NEUMO BioConnect®seals is, e.g., NEUMO GmbH & Co. KG.
To maintain the EHEDG certification, one of the process connections recommended by
EHEDG must be used.These are marked with the logo in the data sheet.
4. Transport, packaging and storage
4.1 Transport
Check the instrument for any damage that may have been caused.
Obvious damage must be reported immediately.
CAUTION!
Damage through improper transport
With improper transport, a high level of damage to property can occur.
▶When unloading packed goods upon delivery as well as during internal
transport, proceed carefully and observe the symbols on the packaging.
▶With internal transport, observe the instructions in chapter 4.2 “Packaging
and storage”.
If the instrument is transported from a cold into a warm environment, the formation of
condensation may result in instrument malfunction. Before putting it back into operation,
wait for the instrument temperature and the room temperature to equalise.
3. Safety / 4. Transport, packaging and storage

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4.2 Packaging and storage
Do not remove packaging until just before mounting.
Keep the packaging as it will provide optimum protection during transport (e.g. change in
installation site, return for calibration).
Permissible conditions at the place of storage:
■Storage temperature: -25 ... +80 °C [-13 ... +176 °F]
■Humidity: 35 ... 93 % relative humidity (non-condensing)
Avoid exposure to the following factors:
■Proximity to hot objects
■Mechanical vibration, mechanical shock (putting it down hard)
■Soot, vapour, dust and corrosive gases
■Hazardous environments, flammable atmospheres
Store the process transmitter in its original packaging in a location that fulfils the condi-
tions listed above. If the original packaging is not available, then store the instrument
in a container that is similar to the original packaging, so that the instrument can't be
scratched and is protected against damage if dropped.
5. Commissioning, operation
The instrument may only be commissioned and operated by skilled personnel/skilled
electrical personnel.
Clean the instrument as described in chapter 12, before it is commissioned.
5.1 Mechanical mounting
Personnel: Skilled personnel
5.1.1 Requirements for mounting point
The display and operating unit of the process transmitter can be adapted to the installa-
tion site.
→ See chapter 2.2 “Description”
■No hazardous environment/flammable atmosphere.
■Mechanical vibration/mechanical shock within the permissible values,
see chapter 15 “Specifications”.
■Sufficient space for a safe electrical installation.
■Operating elements can be accessed following the mounting.
■Protect the instrument from heat sources (e.g. pipes or tanks). Do not expose the
instrument to direct solar irradiation while in operation!
■The components of the instrument must not be provided with thermal insulation.
■Observe the permissible medium and ambient temperatures.These are constituent
elements of the order confirmation.
4. Transport ... / 5. Commissioning, operation

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■Protected against soot, vapour, dust, corrosive gases, coarse dirt and wide fluctua-
tions in ambient temperature. Consider possible restrictions on the ambient tempera-
ture range caused by mating connector used.
5.1.2 Installation
The installation of the instrument must be carried out in accordance with the specifica-
tions of the respective process connection. Other installation types, e.g. direct welding,
are not permissible and are considered as improper use.
■Avoid any contact with or mechanical loading of the sensor tube. Scratches in the
sensor tube (e.g. from sharp-edged objects) are the main points of attack for corrosion
and have a negative effect on the surface quality.
■Remove production-related process materials before commissioning. See chapter
12.2 “Cleaning wetted parts”.
■Sealing of the process connection
■Select suitable seal for the respective application and diaphragm seal version.
■Ensure cleanliness of the seal and the sealing face.
■Centre the seal on the sealing face.
■When using soft or PTFE seals, observe the instructions of the seal manufacturer,
particularly with regard to tightening torque and load cycles.
■For installation, the appropriate fastenings must be used. Mount these with the
prescribed tightening torque.
■All influences (reaction forces) of the pipeline (e.g. temperature changes, assembly
forces) must be compensated before and after the measuring instrument in order to
avoid measured errors.
5.2 Mounting instructions for EHEDG and 3-A
Observe the following instructions, especially for EHEDG-certified and 3-A-compliant
instruments.
■For compliance with the EHEDG certification, one of the EHEDG-recommended
process connections must be used.These are marked with the logo in the data sheet.
■For compliance with 3-A conformity, a 3-A-compliant process connection must be
used.These are marked with the logo in the data sheet.
■Mount the instrument with minimal dead space and able to be cleaned easily.
■The mounting position of the instrument should be designed to be self-draining. See
chapter 5.2.1 “Installation regulations for self-draining”.
■The mounting position must not form a draining point or cause a basin to be formed.
5. Commissioning, operation

19WIKA operating instructions, model DMSU22SA
EN
14437648.01 09/2023 EN/DE
5.2.1 Installation regulations for self-draining
Due to the sensor tube geometry, the self-draining of liquid media is only fulfilled if
the maximum deflection β for the gradient of angle α is observed. The design basis is
the EHEDG guideline Doc. 8.This means that the ASME BPE-2019 standard, Table
SD-2.4.3.1-1, is also complied with.
5.3 Electrical mounting
Personnel: Skilled electrical personnel
CAUTION!
Damage to the instrument
When working on open electric circuits (PCBs) there is a risk of damaging
sensitive electronic components through electrostatic discharge.
▶The correct use of grounded working surfaces and personal armbands is
required.
5.3.1 Requirements for connection cable
■Use and assemble connection cable that is suitable for the application. For cables with
flexible wires, always use ferrules appropriate for the wire cross-section.
■For the application (outdoor installation or cable length > 30 m), it is mandatory to use
a shielded cable and connect both ends of the shield. Within the instrument, the shield
must be connected with the ground terminal. Connecting the shield with the cable
bushing is not sufficient.
■If electromagnetic radiation exceeds the test values per EN 61326, it is mandatory to
use a shielded cable.
■When using an M12 x 1 (4-pin) circular connector, the mating connector is supplied by
the customer. Ensure the matching design from the connector manufacturer.
→ See chapter 15, table “Electrical connections”
α
β
Gradient αDisplacement β
≥ 3° ≤ ± 0°
≥ 4° ≤ ± 10°
≥ 5° ≤ ± 13°
≥ 6° ≤ ± 17°
≥ 7° ≤ ± 20°
≥ 8° ≤ ± 22°
≥ 9° ≤ ± 24°
≥ 10° ≤ ± 26°
≥ 15° ≤ ± 35°
≥ 20° ≤ ± 45°
≥ 27° ≤ ± 26°
5. Commissioning, operation

20 WIKA operating instructions, model DMSU22SA
EN
14437648.01 09/2023 EN/DE
5.3.2 Opening the case
CAUTION!
Ingress of moisture
Moisture can destroy the process transmitter.
▶Protect the opened process transmitter against moisture.
Plastic case
▶Screw off the case head cover by hand and pull out the display and operating unit or
push-on cap.
Stainless steel case
▶Screw off the case head cover by means of an open-ended spanner and pull out the
display and operating unit or push-on cap.
5.3.3 Shielding and grounding
The model DMSU22SA must be grounded via the ground terminal (inside or outside).
If the instrument is grounded via the process connection, the grounding at the ground
terminals can be omitted.
5. Commissioning, operation