Knick SensoGate WA131 User manual

User Manual SensoGate WA131
Retractable Fitting
www.knick.de
Read before installation.
Keep for future use.

SensoGate WA131
2
Supplemental Directives
READ AND SAVE THIS DOCUMENT FOR FUTURE REFERENCE. BEFORE ATTEMPTING TO ASSEMBLE,
INSTALL, OPERATE OR MAINTAIN THE PRODUCT, PLEASE ENSURE A COMPLETE UNDERSTANDING OF
THE INSTRUCTIONS AND RISKS DESCRIBED HEREIN. ALWAYS OBSERVE ALL SAFETY INFORMATION.
FAILURE TO COMPLY WITH INSTRUCTIONS IN THIS DOCUMENT COULD RESULT IN SERIOUS INJURY
AND/OR PROPERTY DAMAGE. THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE.
These supplemental directives explain how safety information is laid out in this document and
what content it covers.
Safety Chapter
This document's safety chapter is designed to give the reader a basic understanding of safety. It
illustrates general hazards and gives strategies on how to avoid them.
Warnings
This document uses the following warnings to indicate hazardous situations:
Symbol Category Meaning Remark
WARNING Designates a situation that can lead to death or serious
(irreversible) injury.
The warnings contain
information on how to
avoid the hazard.
CAUTION Designates a situation that can lead to slight or moderate
(reversible) injury.
None NOTICE Designates a situation that can lead to property or
environmental damage.
Symbols Used in this Document
Symbol Meaning
Reference to additional information
Interim or final result in instructions for action
Sequence of figures attached to an instruction for action
Item number in a figure
Item number in text

SensoGate WA131
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Table of Contents
1 Safety............................................................................................................................................. 5
1.1 Intended Use ......................................................................................................................................................... 5
1.2 Personnel Requirements ................................................................................................................................... 5
1.3 Safeguards.............................................................................................................................................................. 6
1.4 Residual Risks ........................................................................................................................................................ 7
1.5 Safety Accessories................................................................................................................................................ 8
1.6 Hazardous Substances ....................................................................................................................................... 9
1.7 Operation in Explosive Atmospheres ........................................................................................................... 9
1.7.1 Possible Ignition Hazards During Installation and Maintenance.......................................... 9
1.7.2 Possible Ignition Hazards During Operation................................................................................ 10
1.8 Safety Training ...................................................................................................................................................... 10
1.9 Maintenance and Spare Parts.......................................................................................................................... 10
2 Product .......................................................................................................................................... 11
2.1 Package Contents ................................................................................................................................................ 11
2.2 Product Identification......................................................................................................................................... 11
2.2.1 Example of a Version ............................................................................................................................. 11
2.2.2 Product Code ........................................................................................................................................... 12
2.3 Nameplates ............................................................................................................................................................ 14
2.4 Symbols and Markings....................................................................................................................................... 16
2.5 Design and Function........................................................................................................................................... 16
2.5.1 Retractable Fitting.................................................................................................................................. 17
2.5.2 Drives and Sensor Holders.................................................................................................................. 18
2.5.3 Process Connections ............................................................................................................................. 18
2.5.4 Immersion Tubes .................................................................................................................................... 19
2.6 Permissible Changes........................................................................................................................................... 19
2.7 SERVICE/PROCESS Limit Positions ................................................................................................................. 20
2.7.1 Service and Process Position.............................................................................................................. 20
2.7.2 Limit Signals ............................................................................................................................................. 21
3 Installation .................................................................................................................................... 22
3.1 Retractable Fitting: Installation....................................................................................................................... 22
3.2 Safety Accessories: Installation ....................................................................................................................... 22
3.3 Outlet Hose: Installation.................................................................................................................................... 23
3.4 Inlet Hose (Option): Installation...................................................................................................................... 23
3.5 Pneumatic Control: Installation ...................................................................................................................... 24
4 Commissioning ............................................................................................................................. 25
5 Operation ...................................................................................................................................... 26
5.1 Moving into the Process Position (PROCESS Limit Position) ................................................................ 26
5.2 Moving into the Service Position (SERVICE Limit Position)................................................................... 26
5.3 Installing and Removing Sensors................................................................................................................... 27
5.3.1 Safety Instructions on Installing and Removing Sensors......................................................... 27
5.3.2 Solid-Electrolyte Sensor, Short Immersion Depth: Installation ............................................. 27

SensoGate WA131
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5.3.3 Solid-Electrolyte Sensor, Short Immersion Depth: Removal .................................................. 28
5.3.4 Solid-Electrolyte Sensor, Long Immersion Depth: Installation .............................................. 29
5.3.5 Solid-Electrolyte Sensor, Long Immersion Depth: Removal ................................................... 30
5.3.6 Liquid-Electrolyte Sensor: Installation ............................................................................................ 31
5.3.7 Liquid-Electrolyte Sensor: Removal................................................................................................. 33
6 Maintenance ................................................................................................................................. 34
6.1 Inspection............................................................................................................................................................... 34
6.1.1 Inspection and Maintenance Intervals........................................................................................... 34
6.1.2 Knick Premium Service......................................................................................................................... 34
6.2 Preventive Maintenance.................................................................................................................................... 35
6.2.1 Approved Lubricants............................................................................................................................. 35
6.2.2 Characteristics of Process-Wetted Materials................................................................................. 35
6.3 Corrective Maintenance .................................................................................................................................... 36
6.3.1 Corrective Maintenance Safety Instructions ................................................................................ 36
6.3.2 Drive Unit: Removal............................................................................................................................... 36
6.3.3 Drive Unit: Assembly............................................................................................................................. 37
6.3.4 Immersion Tube: Removal .................................................................................................................. 38
6.3.5 Immersion Tube: Installation.............................................................................................................. 39
6.3.6 Calibration Chamber: Removal ......................................................................................................... 40
6.3.7 Calibration Chamber: Installation..................................................................................................... 41
6.3.8 Knick Repair Service .............................................................................................................................. 41
7 Troubleshooting ........................................................................................................................... 42
7.1 Malfunction States............................................................................................................................................... 42
8 Removal from Operation ............................................................................................................. 43
8.1 Retractable Fitting: Removal............................................................................................................................ 43
8.2 Returns..................................................................................................................................................................... 43
8.3 Disposal ................................................................................................................................................................... 43
9 Spare Parts, Accessories, and Tools............................................................................................. 44
9.1 Seal Kits.................................................................................................................................................................... 44
9.2 Spare Parts.............................................................................................................................................................. 46
9.3 Accessories ............................................................................................................................................................. 47
9.4 Tools.......................................................................................................................................................................... 51
10 Dimension Drawings .................................................................................................................... 52
11 Specifications................................................................................................................................ 58

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1 Safety
This document contains important instructions for the use of the product. Always follow all
instructions and operate the product with caution. If you have any questions, please contact
Knick Elektronische Messgeräte GmbH & Co. KG (sometimes hereafter referred to as "Knick")
using the information provided on the back page of this document.
1.1 Intended Use
The SensoGate WA131 is a retractable fitting for installation in boilers, tanks, and pipes. The product is
used to mount a sensor for measuring process parameters. The sensor is immersed in the process
medium by the SensoGate WA131. The SensoGate WA131 is pneumatically operated.
Cleaning, calibration, or sensor replacement under process conditions by the customer (hereinafter
sometimes referred to as the "operating company") may be conducted, subject to the requirements
set forth herein, by placing the product into the service position (SERVICE limit position).
If the product is used with any product or part not authorized by Knick, the operating company
assumes all risks and liabilities related thereto.
The SensoGate WA131 can be used with the following sensor types:
Solid-electrolyte sensors Outer diameter 12mm, length225 mm, sensor head thread PG13.5
Liquid-electrolyte sensors Outer diameter 12mm, length 250mm
Optical sensors Outer diameter 12mm
For further information, refer to the applicable documentation of the sensor manufacturer.
The defined operating conditions must be observed when using this product. ➜Specifications, p. 58
Thanks to its modular design, the SensoGate WA131 can be adapted to changed conditions by the
customer.
➜Permissible Changes, p. 19
USE CAUTION AT ALL TIMES WHEN INSTALLING, USING, MAINTAINING OR OTHERWISE INTERACTING WITH
THE PRODUCT. ANY USE OF THE PRODUCT EXCEPT AS SET FORTH HEREIN IS PROHIBITED, AND MAY RESULT
IN SERIOUS INJURY OR DEATH, AS WELL AS DAMAGE TO PROPERTY. THE OPERATING COMPANY SHALL BE
SOLELY RESPONSIBLE FOR ANY DAMAGES RESULTING FROM OR ARISING OUT OF AN UNINTENDED USE OF
THE PRODUCT.
The SensoGate WA131-X version is certified for operation in hazardous locations.
➜Operation in Explosive Atmospheres, p. 9
1.2 Personnel Requirements
The operating company shall ensure that any personnel using or otherwise interacting with the
product is adequately trained and has been properly instructed.
The operating company shall comply and cause its personnel to comply with all applicable laws, regu-
lations, codes, ordinances and relevant industry qualification standards related to product. Failure to
comply with the foregoing shall constitute a violation of operating company’s obligations concerning
the product, including but not limited to an unintended use as described in this document.

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1.3 Safeguards
1
2
Leakage Bores
The calibration chamber (1) is provided with three radial
leakage bores (2).
Process medium escaping from the leakage bores (2) is
indicative of damage to the calibration chamber’s
O‑rings. This damage can be detected and repaired.
SensoLock Immersion Lock
The SensoLock immersion lock prevents the SensoGate
WA131 from accidentally moving into the process posi-
tion (PROCESS limit position) while the sensor is being re-
placed or serviced. Setting the SensoLock ring to “lock”
mechanically locks the SensoGate WA131.
The SensoGate WA131 is in the service position (SERVICE
limit position). The SensoLock ring is set manually to
“lock” and the SensoGate WA131 cannot be moved to the
process position (PROCESS limit position).
After installing the sensor, the SensoLock ring is set to
“unlock”.
Information on SensoLock is provided on a safety label.
The safety label is attached to the fixing bracket of the
SensoGate WA131.
1
2
Immersion lock without a mounted liquid-electrolyte
sensor
The safeguard is only available with special version V.
➜Product Code, p. 12
The immersion lock can be seen at the yellow indicator
ring (2) above the bellows(1). If the yellow indicator ring
(2) is missing, the safeguard function is not available.
A mechanical lock prevents the SensoGate WA131 with-
out a mounted liquid-electrolyte sensor from being
moved into the process position (PROCESS limit position).
1
Immersion lock without a mounted solid-electrolyte
sensor
The safeguard is only available with special version W.
➜Product Code, p. 12
The immersion lock can be seen at the yellow indicator
ring (1) on the drive unit of the SensoGate WA131. If the
yellow indicator ring (1) is missing, the safeguard func-
tion is not available.
A mechanical lock prevents the SensoGate WA131
without a mounted solid-electrolyte sensor from being
moved into the process position (PROCESS limit position).

SensoGate WA131
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1.4 Residual Risks
The product has been developed and manufactured in accordance with generally accepted safety
rules and regulations, as well as an internal risk assessment. Despite the foregoing, the product may
among others bear the following risks:
Environmental Influences
The effects of moisture, ambient temperature, chemicals, and corrosion can negatively impact the safe
operation of the product.
Please observe the following instructions:
• If possible, install the product inside a protected area of the plant. Alternatively, take appropriate
measures to protect the SensoGate WA131 (e.g., install ZU0759protective cap1)).
➜Accessories, p. 47
• If using aggressive chemical process media, adjust the inspection and maintenance intervals
accordingly. ➜Inspection and Maintenance Intervals, p. 34
• Adhering and sticky process media can impact the functionality of SensoGate WA131 (e.g.,by
causing components to stick together). Adjust the inspection and maintenance intervals accord-
ingly. ➜Inspection and Maintenance Intervals, p. 34
1) The ZU0759 protective cap protects against the effects of weather exposure and prevents the ingress of external
liquids or particles into the area of the sensor connections.

SensoGate WA131
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1.5 Safety Accessories
Specially developed accessories are available to increase safety. ➜Accessories, p. 47
ZU0818 Retainer Clamp for Ingold Socket, 25 mm
The retainer clamp prevents the coupling nut of the Ingold socket (25 mm) screw
joint from accidentally loosening.
The wires of the retainer clamp connect SensoGate WA131 to the customer’s
process port. A locking lug on the retainer clamp engages in the groove of the
coupling nut (form-fit).
ZU1055 Retainer Clamp for Process ConnectionK8
The retainer clamp prevents the coupling nut of the screw joint for a K8 process
connection from unintentionally loosening.
The wires of the retainer clamp connect SensoGate WA131 to the customer’s
process port. A locking lug on the retainer clamp engages in the groove of the
coupling nut (form-fit).
ZU0877 Locking Clamp for Process Connection G1″, G1¼″, R1″, R1¼″, 1″NPT
The locking clamp prevents the process screw joint of a SensoGate WA131 with
threaded connection from accidentally coming loose. The locking clamp is avail-
able for process connections with the following threads: G1″, G1¼″, R1″, R1¼″,
1″NPT.
The locking clamp can be used with threaded couplings with a minimum length
of 10mm and an outer diameter of 39mm to 57mm.
ZU1138 Retainer Clamp for SensoGate Retractable Fitting
The accessory prevents the screw joint between the retractable fitting’s drive
unit and the process connection from accidentally coming loose. This serves to
increase safety during operation of the retractable fitting.
The retainer clamp wires connect the drive unit of the SensoGate WA131 to the
coupling nut. The locking lugs on the retainer clamp engage in the grooves of the
coupling nut (form-fit) and secure the screw joint.

SensoGate WA131
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1.6 Hazardous Substances
IN THE EVENT OF ANY CONTACT WITH HAZARDOUS SUBSTANCES OR OTHER INJURY HEREUNDER, SEEK IM-
MEDIATE MEDICAL ATTENTION OR FOLLOW APPLICABLE PROCEDURES TO ADDRESS HEALTH AND SAFETY
OF PERSONNEL. FAILURE TO SEEK IMMEDIATE MEDICAL ATTENTION MAY RESULT IN SERIOUS INJURY OR
DEATH.
In certain situations (e.g., sensor replacement or corrective maintenance), personnel may come into
contact with the following hazardous substances:
• Process medium
• Lubricant
The operating company is responsible for conducting a hazard assessment.
See the relevant manufacturers’ safety data sheets for hazard and safety instructions on handling
hazardous substances.
1.7 Operation in Explosive Atmospheres
The SensoGate WA131-X is certified for operation in explosive atmospheres.
• EU Type Examination Certificate KEMA04ATEX4035X
The conditions for installation and operation in hazardous locations can be found on the correspond-
ing certificates.
Exceeding the standardized atmospheric conditions within the manufacturer’s specifications, e.g., with
regard to the ambient temperature and pressure, does not endanger the retractable fitting’s durability.
➜Specifications, p. 58
Related certificates are included in the product’s scope of delivery and are available at www.knick.de
in the current version.
Observe all applicable local and national codes and standards for the installation of equipment in ex-
plosive atmospheres. For further guidance, consult the following:
• IEC60079-14
• EU directives 2014/34/EU and 1999/92/EC(ATEX)
1.7.1 Possible Ignition Hazards During Installation and Maintenance
To avoid mechanically generated sparks, handle the SensoGate WA131-X with care and apply suitable
measures, e.g., use covers and pads.
The metallic parts of the SensoGate WA131-X must be connected to the plant’s equipotential bonding
using the metallic process connection and the grounding connection provided for that purpose.
When components are replaced with genuine Knick spare parts made of other materials (e.g., O‑rings),
the information given on the nameplate may deviate from the actual version of the SensoGate
WA131-X. The operating company must assess and document this deviation.
➜Nameplates, p. 14
Electrostatic Charging
The drive unit of specific versions of the SensoGate WA131-X contains housing components made of
non-conductive plastic. Due to their surface, the housing components may build up an electrostatic
charge. To prevent this charge from becoming an effective ignition source in Zone0, ensure that the
following conditions are met:
• There is no risk of highly efficient charge-generating mechanisms.
• Non-metallic components are cleaned with a moist cloth only.

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Mechanically Generated Sparks
Single impacts on metal parts or collisions between metal parts of the SensoGate WA131-X are not a
potential ignition source only if the following conditions are met:
• Possible impact velocity is less than 1m/s.
• Possible impact energy is less than 500J.
If these conditions cannot be ensured, the operating company must reassess single impacts on metal
parts or collisions between metal parts as potential sources of ignition. The operating company must
implement suitable risk minimization measures, e.g., by ensuring a non-explosive atmosphere.
1.7.2 Possible Ignition Hazards During Operation
When using non-water-based cleaning, rinsing, or calibration media with low conductivities of less
than 1nS/m with a calibration chamber made of polypropylene (PP), electrostatic charging of internal,
conductive components may occur. The operating company must assess the associated risks and im-
plement appropriate measures.
The sensors that are used must be approved for operation in hazardous locations. Further information
can be found in the sensor manufacturer’s documentation.
1.8 Safety Training
Upon request, Knick Elektronische Messgeräte GmbH & Co. KG will provide safety briefings and
product training during initial commissioning of the product. More information is available from the
relevant local contacts.
1.9 Maintenance and Spare Parts
Preventive Maintenance
Preventive maintenance can keep the product in good condition and minimize downtimes. Knick
provides recommended inspection and maintenance intervals. ➜Maintenance, p. 34
Lubricants
Only use lubricants approved by Knick. Special applications or upgrades to special lubricants are avail-
able on request. Usage of any other lubricants shall constitute an unintended use of the product.
➜Maintenance, p. 34
Tools and Mounting Aids
Special and accessory tools help maintenance personnel to replace components and wear parts safely
and professionally. ➜Tools, p. 51
Spare Parts
For professional corrective maintenance of the product, only use Knick genuine spare parts. Usage of
any other spare parts shall constitute an unintended use of the product.
➜Spare Parts, p. 46
Repair Service
The Knick Repair Service offers professional corrective maintenance for the product to the original
quality. Upon request, a replacement unit can be obtained for the period of the repair.
Further information can be found at www.knick.de.

SensoGate WA131
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2 Product
2.1 Package Contents
• SensoGate WA131 in the version ordered
• User Manual
• EU Declaration of Conformity1)
• EU Type Examination Certificate 2)
• As applicable, supplementary datasheet for special versions 2)
2.2 Product Identification
The different versions of the SensoGate WA131 are encoded in a product code.
The product code is stated on the nameplate, the delivery note, and the product packaging.
➜Nameplates, p. 14
2.2.1 Example of a Version
Basic unit WA131 –X1AAH0AA11–00V
Explosion protection ATEX Zone 0 X –
Sensor pH sensor Ø12mm with pressurization unit, pressure
chamber for compressed air supply 1 –
Seal material FKM A –
Process-wetted
materials 3)
1.4571 / 1.4571 / 1.4571 A –
Process connections Ingold socket, 25mm H 0 –
Immersion depth Short A –
Connection, pneumatic Without pneumatic limit signal A –
Rinse media connection Inlet G1/8 (female), outlet G1/8 (female) with outlet
hose, complete(3m) 1 –
SensoLock With 1 –
Special version Immersion lock for fitting without mounted sensor.
For immersion depths A and K. – 0 0 V
1) Part of package contents only for Ex-approved products.
2) Supplied depending on the ordered version of the SensoGate WA131 ➜Product Code, p. 12
3) Material combinations: process-wetted part of calibration chamber / rinse-wetted part of calibration chamber / im-
mersion tube

SensoGate WA131
12
2.2.2 Product Code
Basic unit WA131 –__________–___
Explosion protection ATEX Zone0 X –
None N –
Sensor Sensor, Ø 12mm with PG 13.5 0 –
pH sensor Ø 12mm with pressurization unit,
pressure chamber for compressed air supply 1 –
Optical sensor, Ø 12mm with PG 13.5 4 –
Seal material FKM A –
EPDM B –
EPDM – FDA E –
FFKM – FDA H –
FFKM Chemraz 505 J –
FFKM K –
FFKM Perlast G75B L –
FFKM Kalrez 6375 M –
Process-wetted
materials 1)
1.4571 / 1.4571 / 1.4571 A –
Hastelloy / Hastelloy / Hastelloy B -
PEEK / PEEK / PEEK C –
PVDF / PVDF / PVDF D –
PEEK HD / PEEK HD / PEEK HD E –
PVDF HD / PVDF HD / PVDF HD F –
PP / PP / PP P –
Titanium / Titanium / Titanium T -
1.4571 / 1.4571 / PEEK Z –
Process connections Ingold socket, 25mm H 0 –
Flange, loose, 1.4571, PN10/16, DN32 B 0 –
Flange, loose, 1.4571, PN10/16, DN40 B A –
Flange, loose, 1.4571, PN10/16, DN50 B 1 –
Flange, loose, 1.4571, PN10/16, DN65 B 2 –
Flange, loose, 1.4571, PN10/16, DN80 B 3 –
Flange, loose, 1.4571, PN10/16, DN100 B 4 –
Flange, loose, 1.4571, PN40, DN32 E 0 –
Flange, loose, 1.4571, PN40, DN40 E A –
Flange, loose, 1.4571, PN40, DN50 E 1 –
Flange, loose, 1.4571, PN40, DN65 E 2 –
Flange, loose, 1.4571, PN40, DN80 E 3 –
Flange, loose, 1.4571, PN40, DN100 E 4 –
Dairy pipe DN50 C 1 –
Dairy pipe DN65 C 2 –
Dairy pipe DN80 C 3 –
Dairy pipe DN100 C 4 –
Flange, loose, ANSI 316, 150lbs, 1½″D 0 –
Flange, loose, ANSI 316, 150lbs, 2″D 1 –
Flange, loose, ANSI 316, 150 lbs, 2½″D 2 –
1) Material combinations: process-wetted part of calibration chamber / rinse-wetted part of calibration chamber / im-
mersion tube

SensoGate WA131
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Basic unit WA131 –__________–___
Flange, loose, ANSI 316, 150lbs, 3″D 3 -
Flange, loose, ANSI 316, 150lbs, 3.5″D 4 -
Flange, loose, ANSI 316, 150lbs, 4″D 5 -
Flange, loose, ANSI 316, 300lbs, 1½″P 0 -
Flange, loose, ANSI 316, 300lbs, 2″P 1 -
Flange, loose, ANSI 316, 300 lbs, 2½″P 2 -
Flange, loose, ANSI 316, 300lbs, 3″P 3 -
G1″ (male) G 1 –
G1¼″ (male) G 3 –
G1½″ (male) G 5 –
R1″ (male) 1) R 1 –
R1 ¼″ (male) 1) R 3 –
1“NPT (male) 1) N 1 –
G2¼″ for ARF210/215 K 8 –
Clamp 1.5″J 1 –
Clamp 2″J 2 –
Clamp 1.5″, inclined A J F –
Fitting, DIN 3237-1/-2, PN16, DN252) T X –
Fitting, DIN 3237-1/-2, PN16, DN322) T 0 –
Fitting, DIN 3237-1/-2, PN16, DN402) T A –
Fitting, DIN 3237-1/-2, PN16, DN502) T 1 –
Fitting, DIN 3237-1/-2, PN16, DN802) T 3 –
Immersion depth Short A –
Long B –
Short, no lock-gate function K –
Connection, pneumatic Without pneumatic limit signal A –
With pneumatic limit signal B –
Rinse media connection Without inlet, outlet G⅛″ (female) with outlet hose,
complete (3m) 0 –
Inlet G⅛″ (female), outlet G⅛″ (female) with outlet
hose, complete (3m) 1 –
Inlet G⅛″ (female) with inlet hose, complete (5m),
outlet G⅛″ (female) with outlet hose, complete (3m) 2 –
SensoLock Without 0 –
With 1 –
Special version Without – 0 0 0
Equipped with special grease (provided by cus-
tomer) – 0 0 1
With reinforced scraper ring, PTFE / PEEK (not for In-
gold socket) – 0 0 3
Customer-specific special datasheet – 0 0 F
Immersion lock for fitting without mounted sensor.
For immersion depths A and K. 1 – 0 0 V
Immersion lock for fitting without mounted sensor. 0 – 0 0 W
1) For the following materials only: 1.4571, Hastelloy, titanium, PEEK
2) This version requires an adapter for connection to the sight glass fitting. The adapter is part of the Knick sight glass
fitting.

SensoGate WA131
14
2.3 Nameplates
The SensoGate WA131 is identified by nameplates on the drive unit and the process unit. The informa-
tion provided on the nameplates varies according to the version of the SensoGate WA131.
Nameplate, Version Without Ex Approval
Note: The figure shows a nameplate for the SensoGate WA131-N version by way of example.
WA131
xxxxxxx / xxxx
WA131
xxxxxxx / xxxx
3
4
10
9
8
7
6
5
11
1
2
11
3
4
8
3
6
5
9
11
1Drive unit nameplate 7Product line / assembly group
2Process unit nameplates 8Name of manufacturer
3Manufacturer’s address with designation of origin 9Product line
4Reference to max. operating pressure and
temperature range 1)
10 IP protection
5Serial number / year and week of production 11 CE mark
6Type (product code)
1) Further information is available in the ➜Safety, p. 5 and ➜Specifications, p. 58 chapters.

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15
Nameplate, Version With Ex Approval
Note: The figure shows a nameplate for the SensoGate WA131-X version by way of example.
WA131 xxxxxxx / xxxx
WA131
xxxxxxx / xxxx
1
2
3
4
5
6
7
8
9
10
11
12
13 14
15
16
10
13
8
11
9
16
17
1Drive unit nameplate 10 Serial number / year and week of production
2Process unit nameplate 11 Type (product code)
3Reference to explosion protection information1) 12 Product line / assembly group
4Reference to no self-heating / special conditions 1) 13 Name of manufacturer
5Permissible ambient temperature 14 Product line
6ATEX marking / information on explosion
protection
15 IP protection
7EU Type Examination Certificate test number 16 CE marking with identification number
8Manufacturer’s address with designation of origin 17 Reference to ATEX information for the drive unit
9Reference to max. operating pressure and
temperature range
1) Further information is available in the related EU Type Examination Certificate and in the ➜Safety, p. 5 and
➜Specifications, p. 58 chapters.

SensoGate WA131
16
2.4 Symbols and Markings
Special conditions and danger points! Observe the safety information and instructions on safe use of the
product as outlined in the product documentation.
Reminder to read the documentation.
CE marking with identification number1) of the notified body involved in production control.
ATEX marking1) of the European Union for operation of the SensoGate WA131-X in hazardous locations.
➜Operation in Explosive Atmospheres, p. 9
IP66 protection: The product is dust-tight and offers complete protection against contact as well as
protection against strong water jets.
Outlet symbol marking the outlet port of the SensoGate WA131.
Inlet symbol marking the inlet port of the SensoGate WA131.
Connection of the process position (PROCESS limit position) check-back signal.
Connection of the service position (SERVICE limit position) check-back signal.
2.5 Design and Function
The SensoGate WA131 consists of two main assemblies:
• Drive unit
• Process unit
The drive unit is connected to the process unit with a coupling nut. The drive unit and process unit can
be separated. ➜Drive Unit: Removal, p. 36
Various different versions of drive and process unit can be combined. ➜Permissible Changes, p. 19
The process connection is used to fasten the SensoGate WA131 to the process port.
The pneumatically operated drive unit moves the SensoGate WA131 into the service position
(SERVICE limit position) or the process position (PROCESS limit position).
➜SERVICE/PROCESS Limit Positions, p. 20
1) Dependent on the ordered version. ➜Product Code, p. 12

SensoGate WA131
17
2.5.1 Retractable Fitting
Note: The figure shows an example version of the SensoGate. ➜Product Code, p. 12
1
2
14
13
11
3
4
5
6
7
8
9
10
12
1 Drive unit 8 Outlet port
2 Process unit 9 Calibration chamber
3 Sensor holder 10 Process connection
4 Fixing bracket with grounding connection 11 Immersion tube
5 Pneumatic system check-back signal connection
(option)
12 Inlet port (option)
6 SensoLock (option) 13 Leakage bore
7 Coupling nut 14 Control air connection

SensoGate WA131
18
2.5.2 Drives and Sensor Holders
Note: The figure shows a selection from the product line. ➜Product Code, p. 12
1 2 3
1 Drive, short ID 1), solid-electrolyte sensor (225mm) 3 Drive, short ID 1), liquid-electrolyte sensor (250mm)
2 Drive, long ID 1), solid-electrolyte sensor (225mm)
2.5.3 Process Connections
Note: The figure shows a selection from the product line. ➜Product Code, p. 12
1
2
3
4
1Flange 3Dairy-pipe screw joint
2Ingold socket 4Male thread
1) ID = immersion depth

SensoGate WA131
19
2.5.4 Immersion Tubes
Note: The figure shows a selection from the product line. ➜Product Code, p. 12
1 2
1Immersion tube, long (204mm)
Materials: 1.4571, PEEK, PVDF, Hastelloy, and,
optionally, titanium ➜Spare Parts, p. 46
2Immersion tube, short (149mm)
Materials: 1.4571, PEEK, PVDF, Hastelloy, and,
optionally, titanium ➜Spare Parts, p. 46
2.6 Permissible Changes
The SensoGate WA131 can be adapted to changed conditions by the customer. Prior to making any
changes, contact Knick Elektronische Messgeräte GmbH & Co. KG. The following are examples of
possible changes:
• Change to a different process connection ➜Process Connections, p. 18
• Modification of the sensor holder to fit another sensor type ➜Drives and Sensor Holders, p. 18
• Replacement of process-wetted components (calibration chamber, immersion tube, seals) with
other material characteristics ➜Maintenance, p. 34
• Retrofit of safeguards, e.g., “Immersion lock without a mounted liquid-electrolyte sensor”
➜Safeguards, p. 6
Any changes may result in deviations between the information on the nameplate and the actual
version of the SensoGate WA131. The operating company must assess and document the changes.
In the event of a change to the version, the product must be identified accordingly.
It is recommended that changes to the SensoGate WA131 be carried out by the Knick Repair Service.
After making the necessary changes, a functional and pressure test is carried out and, if necessary, a
modified nameplate is attached. ➜Knick Repair Service, p. 41
More information on changes can be found in the related supplementary datasheet. Maintenance
instructions with detailed instructions for action are available on request.

SensoGate WA131
20
2.7 SERVICE/PROCESS Limit Positions
2.7.1 Service and Process Position
The SensoGate WA131 can assume two limit positions (service or process position).
Service position (SERVICE limit position)
• The sensor is not in contact with the process medium.
• The sensor can be installed, removed, and, as necessary, cleaned while the process is running 1).
• The measuring system can be calibrated and adjusted. 1)
• The limit position can be pneumatically monitored. 1)
Process position (PROCESS limit position)
• The sensor is in contact with the process medium.
• The desired process parameters can be measured.
• The limit position can be pnemuatically monitored. 1)
The service position (SERVICE limit position) and process position (PROCESS limit position) are indi-
cated in different ways depending on the version of the SensoGate WA131.
Solid-electrolyte sensor,
short immersion depth
Solid-electrolyte sensor,
long immersion depth
Liquid-electrolyte sensor,
short immersion depth
1
2
3
SERVICE PROCESS SERVICE PROCESS SERVICE PROCESS
In the service position, the sensor
head (1) is visible at the top end of
the protection sleeve.
In the service position, the service cap
(2) is visible at the top end of the ex-
tension.
In the service position, the bellows (3)
are expanded.
In the process position, the sensor
head (1) is retracted into the protec-
tion sleeve.
In the process position, the service
cap (2) is retracted into the extension.
In the process position, the bellows
(3) are compressed.
1) Availability of functions depends on the ordered version. ➜Product Code, p. 12