Knick SensoGate WA131MH User manual

User Manual SensoGate WA131MH
Manual Retractable Fitting
www.knick.de
Read before installation.
Keep for future use.

SensoGate WA131MH
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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 WA131MH 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

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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 ................................................................................................................................................ 7
1.6 Hazardous Substances........................................................................................................................................ 8
1.7 Operation in Explosive Atmospheres............................................................................................................ 8
1.7.1 Possible Ignition Hazards During Installation and Maintenance........................................... 8
1.7.2 Possible Ignition Hazards During Operation................................................................................. 9
1.8 Safety Training....................................................................................................................................................... 9
1.9 Maintenance and Spare Parts .......................................................................................................................... 9
2 Product.......................................................................................................................................... 10
2.1 Package Contents................................................................................................................................................. 10
2.2 Product Identification......................................................................................................................................... 10
2.2.1 Example of a Version.............................................................................................................................. 10
2.2.2 Product Code............................................................................................................................................ 11
2.3 Nameplates............................................................................................................................................................. 12
2.4 Symbols and Markings ....................................................................................................................................... 14
2.5 Design and Function ........................................................................................................................................... 14
2.5.1 Retractable Fitting .................................................................................................................................. 15
2.5.2 Drives and Sensor Holders................................................................................................................... 16
2.5.3 Process Connections.............................................................................................................................. 16
2.5.4 Immersion Tube....................................................................................................................................... 17
2.6 Permissible Changes ........................................................................................................................................... 17
2.7 Limit Positions ....................................................................................................................................................... 18
2.7.1 SERVICE and PROCESS Position ......................................................................................................... 18
2.7.2 Limit Switch............................................................................................................................................... 19
3 Installation.................................................................................................................................... 20
3.1 Retractable Fitting: Installation ....................................................................................................................... 20
3.2 Safety Accessories: Installation........................................................................................................................ 20
3.3 Outlet Hose: Installation .................................................................................................................................... 21
3.4 Inlet Hose: Installation ........................................................................................................................................ 21
4 Commissioning............................................................................................................................. 22
5 Operation ...................................................................................................................................... 23
5.1 Moving into the PROCESS Position................................................................................................................ 23
5.2 Moving into the SERVICE Position.................................................................................................................. 24

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5.3 Installing and Removing a Sensor.................................................................................................................. 25
5.3.1 Safety Instructions on Installing and Removing Sensors ......................................................... 25
5.3.2 Solid-Electrolyte Sensor, Short Immersion Depth: Installation .............................................. 25
5.3.3 Solid-Electrolyte Sensor, Short Immersion Depth: Removal ................................................... 26
5.3.4 Liquid-Electrolyte Sensor: Installation............................................................................................. 27
5.3.5 Liquid-Electrolyte Sensor: Removal.................................................................................................. 28
6 Maintenance ................................................................................................................................. 29
6.1 Inspection ............................................................................................................................................................... 29
6.1.1 Inspection and Maintenance Intervals............................................................................................ 29
6.1.2 Knick Premium Service.......................................................................................................................... 29
6.1.3 Immersion Lock Without a Mounted Solid-Electrolyte Sensor: Functional Test .............. 29
6.1.4 Immersion Lock Without a Mounted Liquid-Electrolyte Sensor: Functional Test............ 30
6.2 Maintenance .......................................................................................................................................................... 30
6.3 Corrective Maintenance..................................................................................................................................... 31
6.3.1 Corrective Maintenance Safety Instructions ................................................................................. 31
6.3.2 Drive Unit: Disassembly ........................................................................................................................ 31
6.3.3 Drive Unit: Assembly.............................................................................................................................. 32
6.3.4 Immersion Tube: Removal ................................................................................................................... 33
6.3.5 Immersion Tube: Installation .............................................................................................................. 34
6.3.6 Calibration Chamber: Removal .......................................................................................................... 35
6.3.7 Calibration Chamber: Installation ..................................................................................................... 36
6.3.8 Knick Repair Service ............................................................................................................................... 36
7 Troubleshooting ........................................................................................................................... 37
7.1 Malfunction States ............................................................................................................................................... 37
7.2 Retractable Fitting: Emergency Release....................................................................................................... 38
8 Removal from Operation ............................................................................................................. 39
8.1 Retractable Fitting: Removal............................................................................................................................ 39
8.2 Returns ..................................................................................................................................................................... 39
8.3 Disposal.................................................................................................................................................................... 39
9 Spare Parts, Accessories, and Tools............................................................................................. 40
9.1 Gasket Sets.............................................................................................................................................................. 40
9.2 Spare Parts .............................................................................................................................................................. 43
9.3 Accessories.............................................................................................................................................................. 44
9.4 Tools .......................................................................................................................................................................... 47
10 Dimension Drawings.................................................................................................................... 48
11 Specifications................................................................................................................................ 53
Appendix....................................................................................................................................... 54
Glossary......................................................................................................................................... 56
Index.............................................................................................................................................. 57

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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 WA131MH is a retractable fitting for installation in boilers, tanks, and pipes. The product is
used to accommodate a sensor for measuring process parameters. SensoGate WA131MH allows the
sensor to move into the process medium. Moving to the SERVICE or PROCESS position must be per-
formed 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. 53
Thanks to its modular design, SensoGate WA131MH can be adapted to changed conditions by the
customer. ➜Permissible Changes, p. 17
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 WA131MH-X version is certified for operation in explosive atmospheres.
➜Operation in Explosive Atmospheres, p. 8
When installed, SensoGate WA131MH can be sterilized with steam. An independent testing institute
evaluated the product in terms of its sterilizability.1)
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. 9
1) TNO report V7942 dated February 25, 2008, www.tno.nl

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1.3 Safeguards
1
2
Dismount Guard for the Solid-Electrolyte Sensor
When using SensoGate WA131MH versions for solid-electrolyte
sensors, sensors can only be removed in the SERVICE position.
➜Limit Positions, p. 18
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 WA131MH 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 WA131MH.
1
2
Immersion Lock Without a Mounted Liquid-Electrolyte Sensor
The safeguard is only available with special version V.
➜Product Code, p. 11
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 WA131MH 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.

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The availability of safeguards is in part dependent on the version of SensoGate WA131MH.
➜Product Code, p. 11
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 WA131MH in compliance with the stated operating conditions.
➜Specifications, p. 53
• If possible, install the product inside a protected area of the plant. Alternatively, take appropriate
measures to protect the SensoGate WA131MH (e.g. install ZU0759protective cap 1)).
➜Accessories, p. 44
• If using aggressive chemical process media, adjust the inspection and maintenance intervals
accordingly. ➜Inspection, p. 29
• Adhering and sticky process media can impact the functionality of SensoGate WA131MH (e.g.,by
causing components to stick together). Adjust the inspection and maintenance intervals accord-
ingly. ➜Inspection, p. 29
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. 7
Operating SensoGate WA131MH without a retainer or locking clamp is at the risk of the operating
company. The operating company must take action to rule out the possibility of the screw joint cou-
pling nut accidentally loosening.
1.5 Safety Accessories
Specially developed accessories are available to increase safety. ➜Accessories, p. 44
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 WA131MH to the customer’s
process port. A locking lug on the retainer clamp engages in the groove of the
coupling nut (form-fit).
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.

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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.
1.7 Operation in Explosive Atmospheres
The SensoGate WA131MH-X is certified for operation in explosive atmospheres.
• EU-Type Examination Certificate KEMA07ATEX0065
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 WA131MH-X with care and apply suit-
able measures, e.g., use covers and pads.
The metallic parts of the SensoGate WA131MH-X must be connected to the plant’s equipotential
bonding using the metallic process connection and the grounding connection provided for that pur-
pose.
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
WA131MH-X. The operating company must assess and document this deviation.
➜Nameplates, p. 12
Electrostatic charging
The drive unit of specific versions of the SensoGate WA131MH-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:
• Highly efficient charge generating mechanisms are excluded
• 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 WA131MH-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 a low conductivity of less
than 1nS/m, electrostatic charging of internal, conductive components may occur. The operating
company must assess the associated risks and implement appropriate measures.
The sensors that are used must be approved for operation in hazardous locations. Further information
can be found in the sensor documentation.
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. 29
Lubricants
Only lubricants approved by Knick have the necessary properties to ensure trouble-free operation of
the SensoGate WA131MH. Special applications or upgrades to special lubricants are available on re-
quest. ➜Maintenance, p. 30
Tools and Mounting Aids
Special and accessory tools help maintenance personnel to replace components and wear parts safely
and professionally. ➜Tools, p. 47
Spare Parts
Genuine Knick spare parts are available for professional corrective maintenance of the SensoGate
WA131MH. ➜Spare Parts, p. 43
Repair Service
The Knick Repair Service offers professional corrective maintenance on the SensoGate WA131MH 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.

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2 Product
2.1 Package Contents
• SensoGate WA131MH 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 WA131MH are coded in a product code.
The product code is stated on the nameplate, the delivery note, and the product packaging.
➜Nameplates, p. 12
2.2.1 Example of a Version
Basic device with manual drive, stainless steel, hygienic WA131MH – X 0 E H H 1 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 EPDM – FDA E –
Wetted materials 1.4404 / 1.4404 / 1.4404 H –
Process connections Ingold socket, hygienic, 1.4404, 25mm H 1 –
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 WA131MH ➜Product Code, p. 11