Technical information

Mounting arrangements
Instrument hook-ups for the process industry
WIKA data sheet IN 00.34

In many applications within the process industries,
measuring instruments are exposed to critical operating conditions. In order to be able to withstand, forexample, strong pressure surges or extreme temperatures, WIKA attaches valves, protective devices andmounting accessories to the pressure measuring
instrument, depending on the application. This ensures
a stable measurement and optimises maintenance andservicing activities.
Added value for mounting arrangements
The combination of pressure measuring instruments withmatched components enables the protection and the extension of the function of the entire measuring unit. WIKA offers
the qualified assembly of all elements with the pressure
measuring instrument into a mounting arrangement - known
as an “instrument hook-up”.
The diverse portfolio of the attachable components
results from the variation in the applications and customer
requirements.

Example of a mounting arrangement

ValvesModels IV10, IV11, IV20, IV21 - Shut-off valve

Model IVM − Monoflange

Needle valve and multiport valve
Block-and-bleed valve

Compact block-and-bleed arrangement withflange connection

Data sheets AC 09.19 and AC 09.21

Data sheet AC 09.17

Models IV30, IV31, IV50, IV51 − Valve manifold

Model 910.11 − Shut-off valve

Shut-off, pressure compensating, purgeand vent valves for differential pressure
measuring instruments

Shut-off and throttle valve

Data sheet AC 09.23

WIKA data sheet IN 00.34 ∙ 02/2021

Data sheet AC 09.02

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Protective devices and adapters
Model 910.12 − Snubber

Model 910.14 − Connection adapter

Protection from pressure surges and pulsationsin the medium

Adapter pieces for the mounting of valves andprotective devices

Data sheet AC 09.03

Data sheet AC 09.05

Model 910.13 − Overpressure protector

Model 910.15 − Syphon

Adjustable protection against overpressure

Protection from pulsations and overheating
through the medium

Data sheet AC 09.04

Data sheet AC 09.06

Mounting instructions
WIKA mounts the desired components to process industry pressure measuring instruments. For the mounting, WIKA standards with respect to sealing and leak testing apply. If there are no alternative customer specifications, the assembly will be asdescribed in the following table.
Order of attachment
Order of attachment starting from thepressure measuring instrument

Standard alignment and options

Model 910.14
Connection adapter

For adapting threads or to enable positioning of the pressure
measuring instrument through a 360° range.

Model 910.12
Snubber

Adjustment screw will be aligned to the front, in the direction of thedial.

Model 910.13
Overpressure protector

Adjustment screw (longer side) will be aligned to the right, as shownin the drawing.
The set value, as standard, depends on the pressure element:
Bourdon tube:
Diaphragm or capsuleelement:

Model 910.11
Shut-off valve

1.1 x full scale value
Between full scale value and max.
permissible overpressure■ Shut-off valve without test connection per DIN 16270(with vent screw)■ Shut-off valve with test connection per DIN 16271(with vent screw)■ Shut-off valve with separate isolating test connection perDIN 16272

WIKA data sheet IN 00.34 ∙ 02/2021

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Order of attachment starting from thepressure measuring instrument

Standard alignment and options

Models IV10, IV11, IV20, IV21
Shut-off valve (square or flatversion)

Vent connections (if available) point to the rear.
All T-bar handles, for safety reasons, will be supplied in fully closedposition.

Models IV30, IV31, IV50, IV51
Valve manifold (only fordifferential pressure measuringinstruments)

Orientation is determined by the threaded connections of both process connections on the differential pressure measuring instrument.

Model 910.15
Syphon■ U-form: Process connection points to the rear
■ Trumpet form: Upper half of the pipe loop runs forward■ Compact form: With fixed connection thread or LH-RH adjustingnutConnecting flange ormodel IVM monoflange

Flanges (if available) are the first accessory component on the process side. A flange-mounting of the complete mounting arrangement
to the application is thus enabled.

Mounting instructions
The assembly of all components is made in compliance with the specified torques and positions. Each mounting point issealed expertly. Depending on the connection threads and the temperature and pressure ranges, PTFE tape, stainless steel
sealings and other sealing rings are used (for details, see WIKA model 910.17).
Parallel connection threads
The sealing face  is sealed with flat gasket, lens-type sealing ring or WIKA
profile sealing, usually metallic. High-temperature resistant ceramic paste isnormally used for thread lubrication. The sealing point is located before or afterthe thread.



e.g. G ½ per EN 837

e.g. G ¼ per DIN 3852-E

Tapered connection threads
The thread is wrapped with sealing material (e.g. PTFE tape).
The sealing point is located in the thread.
e. g. ½ NPT

For instrument hook-ups of oxygen applications, only tested sealants and lubricants can be used. For hazardous areas, either
conductive sealants and lubricants are used or the mounting arrangement offers additional possibilities for equipotential
bonding (e.g. welding points or fuse plates).
Leak test
In line with EN 12266-1:2003, each sealing point will be 100 % tested with leak detection spray under standard test pressure.
At leaking points, after the application of the leak detection spray, bubbles become visible. The bubble detection method candetect leakage rates of approx. 1·10-3 mbar l/s.
For critical applications, further tests are carried out, depending on the complexity of the instrument hook-up.
Besides the bubble detection method with leak detection spray, WIKA also uses the pressure drop method or leakage rate
determination with helium. In accordance with the EN 1779 (test gas method B4 and B6) leak testing standard, leakage rates
of better than 1 · 10-6 mbar · l/s can be detectable with helium.
Further information
Further information on the selection, installation and operation of pressure gauges are described in Technical Information IN 00.05.
WIKA data sheet IN 00.34 ∙ 02/2021

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02/2021 EN© 09/2010 WIKA Alexander Wiegand SE & Co. KG, all rights reserved.
The specifications given in this document represent the state of engineering at the time of publishing.
We reserve the right to make modifications to the specifications and materials.

WIKA data sheet IN 00.34 ∙ 02/2021

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WIKA Alexander Wiegand SE & Co. KG
Alexander-Wiegand-Straße 30
63911 Klingenberg/GermanyTel.
+49 9372 132-0
Fax+49 9372 132-406
info@wika.de
www.wika.de