Knick SensoGate WA131M User manual

User Manual SensoGate WA131M
Manual Retractable Fitting
www.knick.de
Read before installation.
Keep for future use.

SensoGate WA131M
ii
Supplemental Directives
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 illus-
trates general hazards and gives strategies on how to avoid them.
Warnings
SensoGate WA131M was subjected to a risk assessment. Nevertheless, not all risks can be sufficiently
reduced. 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
Without NOTICE Designates a situation that can lead to property or environ-
mental damage
Symbols Used in this Document
Symbol Meaning
Cross-reference to content within this document
Interim or final results in instructions for action
Item number in figure
Item number in text

SensoGate WA131M
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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
1.4.1 Environmental Influences .................................................................................................................... 7
1.4.2 Accidental Loosening of the Process Connection....................................................................... 7
1.5 Safety Accessories ................................................................................................................................................ 8
1.6 Hazardous Substances........................................................................................................................................ 8
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................................................................................. 9
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 Limit Positions ....................................................................................................................................................... 20
2.7.1 SERVICE and PROCESS Position ......................................................................................................... 20
2.7.2 Limit Switch............................................................................................................................................... 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: Installation ........................................................................................................................................ 23
4 Commissioning............................................................................................................................. 24
5 Operation ...................................................................................................................................... 25
5.1 Moving into the PROCESS Position................................................................................................................ 25
5.2 Moving into the SERVICE Position.................................................................................................................. 26

SensoGate WA131M
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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
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.................................................................................................. 32
6 Maintenance ................................................................................................................................. 33
6.1 Inspection ............................................................................................................................................................... 33
6.1.1 Inspection and Maintenance Intervals............................................................................................ 33
6.1.2 Knick Premium Service.......................................................................................................................... 33
6.1.3 Immersion Lock Without a Mounted Solid-Electrolyte Sensor: Functional Test .............. 33
6.1.4 Immersion Lock Without a Mounted Liquid-Electrolyte Sensor: Functional Test............ 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: Disassembly ........................................................................................................................ 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
7.2 Retractable Fitting: Emergency Release....................................................................................................... 43
8 Removal from Operation ............................................................................................................. 44
8.1 Retractable Fitting: Removal............................................................................................................................ 44
8.2 Returns ..................................................................................................................................................................... 44
8.3 Disposal.................................................................................................................................................................... 44
9 Spare Parts, Accessories, and Tools............................................................................................. 45
9.1 Gasket Sets.............................................................................................................................................................. 45
9.2 Spare Parts .............................................................................................................................................................. 47
9.3 Accessories.............................................................................................................................................................. 48
9.4 Tools .......................................................................................................................................................................... 51
10 Dimension Drawings.................................................................................................................... 52
11 Specifications................................................................................................................................ 58
Appendix....................................................................................................................................... 59
Glossary......................................................................................................................................... 61
Index.............................................................................................................................................. 62

SensoGate WA131M
5
1 Safety
The following safety instructions contain the necessary information for the safe use of the product. If
you have any questions, please contact Knick Elektronische Messgeräte GmbH & Co. KG using the in-
formation provided on the back page of this document.
1.1 Intended Use
SensoGate WA131M is a retractable fitting for installation in boilers, tanks, and pipes. The product is
used to accommodate a sensor for measuring process parameters. SensoGate WA131M allows the sen-
sor to move into the process medium. Moving to the SERVICE or PROCESS position must be performed
manually. While the process is in operation, the sensor can be replaced in the SERVICE position.
The defined operating conditions must be observed when using this product. ➜Specifications, p. 58
Thanks to its modular design, SensoGate WA131M can be adapted to changed conditions by the
customer. ➜Permissible Changes, p. 19
Using the product improperly or for any purpose other than the product's intended purpose is not
permitted and may result in injury to persons or damage to objects or the environment.
The SensoGate WA131M-X version is certified for operation in explosive atmospheres.
➜Operation in Explosive Atmospheres, p. 9
1.2 Personnel Requirements
The personnel must be authorized by the operating company and instructed in handling this product.
The operating company must ensure that personnel are sufficiently qualified in accordance with the
local and national codes and regulations that apply for the area in which the product is being used.
Knick recommends the following minimum personnel qualifications:
Qualified personnel Recommended minimum qualification
Operating personnel Installing and operating machines and industrial plants
Detecting and eliminating minor malfunction states
Ensuring the operability of technical systems based on product documentation
Installation and
maintenance
personnel
Assembling, disassembling, maintaining, monitoring, and repairing electrical machines,
drive systems, and components in the automation industry
Installing cables and electrical equipment as an authorized and licensed electrician
Systematically troubleshooting and eliminating errors in electrical systems
Assessing processes and equipment with respect to the applicable safety and environ-
mental codes and regulations
See also
➜Safety Training, p. 10

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1.3 Safeguards
1
2
Dismount Guard for the Solid-Electrolyte Sensor
When using SensoGate WA131M versions for solid-electrolyte
sensors, sensors can only be removed in the SERVICE position.
➜Limit Positions, p. 20
When in the SERVICE position, the sensor is located in the protec-
tion sleeve (1) or the extension (2) and is not accessible.
Immersion Lock Without a Mounted Solid-Electrolyte Sensor
A mechanical lock prevents a SensoGate WA131M without a
mounted solid-electrolyte sensor from being moved into the
PROCESS position.
The safety lock button cannot be depressed. The rotating collar is
mechanically locked and cannot be rotated.
Information on the immersion lock is provided on a safety label.
The safety label is attached to the strain relief bracket of the
SensoGate WA131M.
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 a SensoGate WA131M without a
mounted liquid-electrolyte sensor from being moved into the
PROCESS position.
The safety lock button cannot be depressed. The rotating collar is
mechanically locked and cannot be rotated.
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.

SensoGate WA131M
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The availability of safeguards is in part dependent on the version of SensoGate WA131M.
➜Product Code, p. 12
Environmental influences may affect the functionality of safeguards (e.g. components stuck together
by process medium). ➜Residual Risks, p. 7
1.4 Residual Risks
The product has been developed and manufactured in accordance with generally accepted safety
rules and regulations. However, it is not possible to rule out all risks.
1.4.1 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:
• Only operate SensoGate WA131M in compliance with the stated operating conditions.
➜Specifications, p. 58
• If possible, install the product inside a protected area of the plant. Alternatively, take appropriate
measures to protect the SensoGate WA131M (e.g. install ZU0759protective cap 1)).
➜Accessories, p. 48
• If using aggressive chemical process media, adjust the inspection and maintenance intervals
accordingly. ➜Inspection, p. 33
• Adhering and sticky process media can impact the functionality of SensoGate WA131M (e.g.,by
causing components to stick together). Adjust the inspection and maintenance intervals accord-
ingly. ➜Inspection, p. 33
1.4.2 Accidental Loosening of the Process Connection
The coupling nut of the screw joint on process connections with a thread may become loose by acci-
dent. This may be caused by manual rotation of the rotating collar when moving to the limit positions
or by process-related vibrations.
Pressurized process medium may escape. Use of an appropriate retainer clamp or locking clamp is
strongly recommended. ➜Safety Accessories, p. 8
Operating SensoGate WA131M without a retainer or locking clamp is at the risk of the operating com-
pany. The operating company must take action to rule out the possibility of the screw joint coupling
nut accidentally loosening.
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 WA131M
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1.5 Safety Accessories
Specially developed accessories are available to increase safety. ➜Accessories, p. 48
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 WA131M 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 WA131M 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 the installed SensoGate
WA131M with threaded connection from accidentally loosening. The locking
clamp is available 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.
1.6 Hazardous Substances
In certain situations (e.g. sensor replacement or corrective maintenance), personnel may come into
contact with the following hazardous substances:
• Process medium
• Calibration or cleaning medium
• Lubricant
The operating company is responsible for conducting a risk assessment.
See the relevant manufacturer’s safety data sheets for hazard warnings and safety instructions on
handling hazardous substances.

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1.7 Operation in Explosive Atmospheres
The SensoGate WA131M-X is certified for operation in explosive atmospheres.
•EU-Type Examination Certificate KEMA04ATEX4035X
Exceeding the standard atmospheric conditions within the manufacturer’s specifications, such as am-
bient temperature, process pressure and temperature, does not impair the durability of the retractable
fittings.
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 WA131M-X with care and apply suit-
able measures, e.g., use covers and pads.
The metallic parts of the SensoGate WA131M-X must be connected to the plant’s equipotential bond-
ing 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
WA131M-X. The operating company must assess and document this deviation.
➜Nameplates, p. 14
Electrostatic charging
The drive unit of specific versions of the SensoGate WA131M-X contains housing components made
of non-conductive plastic. Due to their surface, the housing components may build up an electro-
static charge. To prevent this charge from becoming an effective ignition source in Zone0, ensure
that the following conditions are met:
• Highly efficient charge generating mechanisms are excluded
• Non-metallic components are cleaned with a moist cloth only
Mechanically generated sparks
Single impacts on metal parts or collisions between metal parts of the SensoGate WA131M-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 documentation.

SensoGate WA131M
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1.8 Safety Training
Upon request, Knick Elektronische Messgeräte GmbH & Co. KG will provide safety instruction and
product training during initial commissioning of the product. Further information is available from the
relevant Knick representatives.
1.9 Maintenance and Spare Parts
Preventive Maintenance
Preventive maintenance can keep the product in good condition and minimize downtimes. Knick pro-
vides recommended inspection and maintenance intervals. ➜Maintenance, p. 33
Lubricants
Only lubricants approved by Knick have the necessary properties to ensure trouble-free operation of
the SensoGate WA131M. Special applications or upgrades to special lubricants are available on request.
➜Preventive Maintenance, p. 35
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
Genuine Knick spare parts are available for professional corrective maintenance of the SensoGate
WA131M. ➜Spare Parts, p. 47
Repair Service
The Knick Repair Service offers professional corrective maintenance on the SensoGate WA131M 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 WA131M
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2 Product
2.1 Package Contents
• SensoGate WA131M in the version ordered
• Outlet hose
• Inlet hose 1)
• User Manual
• As applicable, supplementary datasheet for special versions 1)
• EU Declaration of Conformity
• EU-Type-Examination Certificate 1)
2.2 Product Identification
The different versions of the SensoGate WA131M are coded 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 device with manual drive, stainless steel WA131M – X 0 K B H 0 A A 2 2 – 0 0 0
Explosion protection ATEX Zone0 X –
Sensor Sensor, Ø 12mm with PG 13.5 0 –
Gasket material FFKM K –
Wetted materials Hastelloy / Hastelloy / Hastelloy B –
Process connections Ingold socket, 25mm H 0 –
Immersion depth Short A –
Electrical limit signal Without A –
Rinse media connection Inlet G1/8 (female) and inlet hose, complete(5m),
outlet G1/8(female) with outlet hose, complete(3m) 2 –
Housing material Stainless steel / PEEK (<10bar operating pressure) 2 –
Special version Without – 0 0 0
1) Delivery is dependent on the ordered version of SensoGate WA131M ➜Product Code, p. 12

SensoGate WA131M
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2.2.2 Product Code
Basic device with manual drive, stainless steel WA131M –__________–___
Explosion protection ATEX Zone0 X –
Without 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 –
Gasket material FKM A –
EPDM B –
EPDM – FDA E –
FFKM – FDA H –
FFKM K –
FFKM Perlast G75B1) L –
Wetted
materials2)
1.4571 / 1.4571 / 1.4571 A –
Hastelloy / Hastelloy / Hastelloy1) 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1) T –
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25 E X –
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, 1 1/2″D 0 –
Flange, loose, ANSI 316, 150lbs, 2″D 1 –
Flange, loose, ANSI 316, 150lbs, 2 1/2″D 2 –
Flange, loose, ANSI 316, 150lbs, 3″1) D 3 –
1) Special option, lead time on request
2) Material combinations: process-wetted part of calibration chamber / rinse-wetted part of calibration chamber / im-
mersion tube

SensoGate WA131M
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Basic device with manual drive, stainless steel WA131M –__________–___
Flange, loose, ANSI 316, 150lbs, 3.5″1) D 4 –
Flange, loose, ANSI 316, 150lbs, 4″1) D 5 –
Flange, loose, ANSI 316, 300lbs, 1 1/2″1) P 0 –
Flange, loose, ANSI 316, 300lbs, 2″1) P 1 –
Flange, loose, ANSI 316, 300lbs, 2 1/2″1) P 2 –
Flange, loose, ANSI 316, 300lbs, 3″1) P 3 –
G1 (male) G 1 –
G1 1/ 4 (male) G 3 –
G1 1/ 2 (male) G 5 –
R1 (male)2) R 1 –
R1 1/ 4 (male)2) R 3 –
1″ NPT (male)2) N 1 –
Clamp 1.5″J 1 –
Clamp 2″J 2 –
Fitting, DIN 3237-1/-2, PN16, DN253) T X –
Fitting, DIN 3237-1/-2, PN16, DN323) T 0 –
Fitting, DIN 3237-1/-2, PN16, DN403) T A –
Fitting, DIN 3237-1/-2, PN16, DN503) T 1 –
Fitting, DIN 3237-1/-2, PN16, DN803) T 3 –
Immersion depth Short A –
Long B –
Short, no lock-gate function K –
Short, stroke length reduced by 8mm L –
Electrical limit signal Without A –
With B –
Rinse media connection Without inlet,
outlet G1/8 (female) with outlet hose, complete (3m) 0 –
Inlet G1/8 (female),
outlet G1/8 (female) with outlet hose, complete(3m) 1 –
Inlet G1/8 (female) and inlet hose, complete(5m),
outlet G1/8(female) with outlet hose, complete(3m) 2 –
Housing material Stainless steel / PP (< 6bar operating pressure) 1 –
Stainless steel / PEEK (<10bar operating pressure) 2 –
Special version Without – 0 0 0
Equipped with special grease
(provided by customer) – 0 0 1
With reinforced scraper ring, PTFE / PEEK
(not for Ingold socket) – 0 0 3
Customer-specific special datasheet – 0 0 F
Calibration chamber, grease-free, coated O-rings,
only for FKM, EPDM, FFKM1) – 0 0 R
Immersion lock for fitting without mounted sensor.
For immersion depths A, K, L, M, and pH sensor type 1. – 0 0 V
1) Special option, lead time on request
2) For the following materials only: 1.4571, Hastelloy, titanium, PEEK
3) For 1.4571 without additional adapter. For PEEK, PVDF, PEEK HD, PVDF HD with additional adapter ZU**** only

SensoGate WA131M
14
2.3 Nameplates
The SensoGate WA131M is identified on the drive unit and the process unit by nameplates. The infor-
mation provided on the nameplates varies according to the version of the SensoGate WA131M.
Nameplate, Version With Ex Approval
Note: The figure shows a nameplate for the SensoGate WA131M-X version by way of example.
Max. pressure
Temperature range See Drive Unit
for Ex marking
0044
SensoGate®
Process Unit
14163 Berlin
Made in Germany
Type WA131M-X*KBH0**2*-000 No. 2203709 / 1906
WA131M-X0K***AA*2-000
2203711 / 1910
1
2
1 Drive unit nameplate 2 Process unit nameplate

SensoGate WA131M
15
Nameplate, Version Without Ex Approval
Note: The figure shows a nameplate for the SensoGate WA131M-N version by way of example.
14163 Berlin Made in Germany
SensoGate®
Type
No.
Process Unit
WA131M-N0A***AA*1-000
2203710 / 1907
WA131M-N*AAN1**1*-000
2203708 / 1906
1
2
1 Drive unit nameplate 2 Process unit nameplate

SensoGate WA131M
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.
CE marking with identification number of the notified body involved in the production control.
ATEX marking1) of the European Union for operation of SensoGate WA131M-X in explosive atmospheres.
➜Operation in Explosive Atmospheres, p. 9
IP66 protection: The product is dust-tight and offers complete protection against contact as well as pro-
tection against strong water jets.
Safety lock button marked “PRESS”. Used to unlock the SensoGate WA131M at the limit positions for the
purpose of moving to the SERVICE or PROCESS position.
Symbol indicating the direction of rotation to move the SensoGate WA131M to the PROCESS position.
➜Moving into the PROCESS Position, p. 25
Symbol indicating the direction of rotation to move the SensoGate WA131M to the SERVICE position.
➜Moving into the SERVICE Position, p. 26
Outlet symbol marking the outlet port of the SensoGate WA131M.
Inlet symbol marking the inlet port of the SensoGate WA131M.1)
2.5 Design and Function
SensoGate WA131M 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: Disassembly, 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 WA131M to the process port.
Manually rotating the rotating collar makes the drive unit move SensoGate WA131M to the SERVICE or
PROCESS position. ➜Limit Positions, p. 20
1) Availability is dependent on the ordered version. ➜Product Code, p. 12

SensoGate WA131M
17
2.5.1 Retractable Fitting
Note: The figure shows an example version of the SensoGate. ➜Product Code, p. 12
1
2
14
13
12
3
4
5
6
7
8
9
10
11
1Drive unit 8Inlet port1)
2Process unit 9Immersion tube
3Protection sleeve 10 Process connection (e.g., Ingold socket)
4Strain relief bracket (with grounding connection) 11 Calibration chamber, base
5Rotating collar 12 Calibration chamber, top
6Coupling nut 13 Leakage bore
7Outlet port 14 Safety lock button
1) Availability is dependent on the ordered version. ➜Product Code, p. 12

SensoGate WA131M
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
1Drive, short ID 1), solid-electrolyte sensor (225mm) 3Drive, short ID 1), liquid-electrolyte sensor (250mm)
2Drive, 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 41″ NPT (male)
1) ID = immersion depth

SensoGate WA131M
19
2.5.4 Immersion Tubes
Note: The figure shows a selection from the product line. ➜Product Code, p. 12
1 2 3 4
1Metal immersion tube, long (204mm) 3Metal immersion tube, short (149mm)
2Plastic immersion tube, long (204mm) 4Plastic immersion tube, short (149mm)
2.6 Permissible Changes
SensoGate WA131M 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 possi-
ble changes:
• Change to a different process connection ➜Process Connections, p. 18
• Replacement of process-wetted components (calibration chamber, immersion tube, gaskets) with
other material characteristics ➜Maintenance, p. 33
• Modification of the sensor holder to fit another sensor type ➜Drives and Sensor Holders, p. 18
• 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 ver-
sion of the SensoGate WA131M. The operating company is responsible for evaluating the permissibil-
ity of the changes and for documenting and identifying the modified version.
It is recommended that changes to the SensoGate WA131M are carried out by the Knick Repair Ser-
vice. After making the necessary changes, a functional and pressure test is carried out and, if neces-
sary, a modified nameplate is attached.
More information on changes can be found in the related supplementary datasheet. Maintenance
instructions with detailed instructions for action are available on request.
See also
➜Corrective Maintenance, p. 36
➜Knick Repair Service, p. 41

SensoGate WA131M
20
2.7 Limit Positions
2.7.1 SERVICE and PROCESS Position
SensoGate WA131M can assume two limit positions (SERVICE or PROCESS position).
SERVICE 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)
PROCESS position
• The sensor is in contact with the process medium.
• The desired process parameters can be measured.
When using versions of SensoGate WA131M with electronic limit signal, a contact is closed when a
limit position is reached at the limit switch. An electrical signal, e.g. at the control center, can be dis-
played when the limit position is reached. ➜Limit Switch, p. 21
The limit positions are indicated in different ways depending on the version of SensoGate WA131M used.
Solid-electrolyte sensor,
short immersion depth
Solid-electrolyte sensor,
long immersion depth
Liquid-electrolyte sensor,
short immersion depth
1
2
3
1
2
4
1
2
5
SERVICE PROCESS SERVICE PROCESS SERVICE PROCESS
In the SERVICE position, the sensor
head (3) is visible at the top end of
the protection sleeve.
In the SERVICE position, the service
cap (4) is visible at the top end of
the extension.
In the SERVICE position, the bel-
lows (5) are expanded.
In the PROCESS position, the sensor
head (3) is retracted into the protec-
tion sleeve.
In the PROCESS position, the service
cap (4) is retracted into the exten-
sion.
In the PROCESS position, the bel-
lows (5) are compressed.
In both limit positions, the rotating
collar(2) is locked and the safety
lock button(1) is not depressed.
In both limit positions, the rotating
collar(2) is locked and the safety
lock button (1) is not depressed.
In both limit positions, the rotating
collar(2) is locked and the safety
lock button (1) is not depressed.
1) Availability of functions is dependent on the version ordered ➜Product Code, p. 12