Mounting arrangements Combination of fittings with pressure gauges for the process industry Electrical

Mounting arrangements Combination of fittings with pressure gauges for the process industry Electrical
Electrical
Technical
information
temperature
measurement
Mounting arrangements
Combination of fittings with pressure gauges
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. To be able to resist, for example, strong
pressure surges or extreme temperatures, depending
on the application, WIKA fits mechanical accessories,
such as overpressure protection devices, shut-off
valves or syphons, to pressure gauges.
Added value through accessories
The combination of pressure gauges with matched additional fittings 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 gauge into a
mounting arrangement - known as a “hook-up”.
The diverse portfolio of accessories results from the variation
in the applications and customer requirements.
Valves and protective devices
Example of a mounting arrangement
Model 910.11 shut-off valve
Model 910.12 snubber
Shut-off and throttle valve
Protection from pressure surges and
pressure pulses of the medium
Data sheet AC 09.02
Data sheet AC 09.03
Model 910.13 overpressure protector
Model 910.14 adapter
Adjustable protection against overpressure
Adapter for the mounting of valves and
protective devices
Data sheet AC 09.04
Data sheet AC 09.05
Model 910.15 syphon
Model 910.25 valve manifold
Protection from pressure pulses and
overheating through the medium
Shut-off and throttle valve as well as purge
and vent valve for differential pressure
measurements
Data sheet AC 09.06
Data sheet AC 09.11
Model 910.80 monoflange
Model 910.81 barstock valve
Combination of block and bleed valve
Shut-off and throttle valve
Data sheet AC 09.17
Data sheet AC 09.18
WIKA data sheet IN 00.34 ∙ 11/2015
Page 1 of 3
Mounting instructions
WIKA mounts the desired fittings to process industry
pressure gauges. For the mounting, WIKA standards with
respect to sealing and leak testing apply. If there are no
alternative customer specifications, the assembly will be as
described in the following table.
Order of attachment of fittings
Order of attachment starting from the pressure gauge
Standard alignment and options
Snubber
Adjustment screw will be aligned to the front, in the direction of the
dial.
Overpressure protector
Adjustment screw (longer side) will be aligned to the right, as shown
in the drawing.
The set value, as standard, depends on the pressure element:
Bourdon tube:
1.1 x full scale value
Diaphragm or capsule element: Between full scale value and
max. permissible overpressure
Shut-off valve
(barstock or DIN version)
Vent connections (if available) point to the rear.
All shut-off knobs, for safety reasons, will be supplied in fully closed
position.
Valve manifold
(only for differential pressure
gauges)
Orientation is determined by the threaded connections of both process connections on differential pressure gauges.
Syphon
■■ U-shaped syphon: process connection points to the rear
■■ Circular syphon: upper half of the pipe loop runs forward.
Flange
(Connecting or 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.
Page 2 of 3
WIKA data sheet IN 00.34 ∙ 11/2015
Mounting instructions
The assembly of all components is made in compliance with
the specified torques and positions. Each mounting point is
sealed 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).
For “hook-ups” of oxygen applications, only tested sealing
and lubrication materials can be used.
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
can detect leak rates of approx. 1 · 10-3 mbar l/s.
For critical applications, further tests are carried out, depending on the complexity of the “hook-up”.
Besides the bubble detection method with leak detection
spray, WIKA also uses the pressure drop method or leak rate
determination with helium. In accordance with the EN 1779
(test gas method B4 and B6) leak testing standard, leak rates
of better than 1 · 10-6 mbar · l/s can be detected with helium.
Further information
Further information on the selection, installation and operation of pressure gauges with elastic pressure elements are
described in Technical Information IN 00.05.
11/2015 DE
© 2015 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 ∙ 11/2015
Page 3 of 3
WIKA Alexander Wiegand SE & Co. KG
Alexander-Wiegand-Straße 30
63911 Klingenberg/Germany
Tel.
+49 9372 132-0
Fax
+49 9372 132-406
info@wika.de
www.wika.de
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