Technical information

Mechanical mounting
For WIKA pressure sensors and WIKA pressure switches
WIKA data sheet IN 00.14

Applications■ For fastening and sealing of a WIKA pressure sensor■ For fastening and sealing of a WIKA pressure switch

Versions■ Standard process connections■ Flush process connections■ UHP process connections■ Hygienic process connections

Description
WIKA offers measuring instruments with a variety of processconnections in order to meet diverse customer-specificapplication requirements.

Thread types
WIKA offers process connections with various thread types
which are used in numerous applications worldwide.

The customer must provide an appropriate tapped holewhen installing the pressure sensor or pressure switch. This
receives the WIKA pressure measuring sensor or the WIKA
pressure switch.

Types of sealing
Depending on the process connection and the medium,
different sealings and sealing materials can be used.
Depending on the pressure connection, the location of thesealing varies (→ For notes on sealings, see WIKA data sheet
AC 09.08).
You can find further information below. Some tapped holes
are available from WIKA as welding sockets. They can beordered with the specified WIKA order number.

When selecting the appropriate tapped hole, the processconnection is just as critical as the thread type of the processconnection and the use of the sealing. Process connections
are basically divided into standard and flush processconnections.

WIKA data sheet IN 00.14 ∙ 07/2022

Page 1 of 10

Making the mechanical connection
Requirements for the mounting point
The mounting point must meet the following conditions:■ The sealing faces at the pressure sensor and the measuring locations always have to be clean.
■ Remove any protective cap and/or Mylar or protective foil not until shortly before installation.

■ Permissible ambient temperatures remain within the performance limits of the measuring instrument. Consider possible

restrictions on the ambient temperature range caused by mating connectors used.

Mechanical mounting:
1. Prior to commissioning, the pressure sensor must be subjected to a visual inspection.
Leaking liquid is indicative of damage.
2. Seal the sealing face (→ see “Sealing variants”).
3. At the mounting point, screw the pressure sensor in hand-tight.
4. When screwing in, do not cross the threads.
5. Only ever screw in, or unscrew, the instrument via the spanner flats. Never use the case as a working surface (→ see“Spanner flats”).
6. Tighten the pressure sensor with a torque spanner using the spanner flats.
The correct torque depends on the mounting point (e.g. material and shape).
Only use the pressure sensor if it is in perfect condition with respect to safety.
Only use original accessories. For accessories, see data sheet for the respective pressure sensor or pressure switch.
Additional notes for cooling element
For heat dissipation, the cooling element must not be insulated.
Additional notes for flush process connections■ Check the diaphragm for damage.
■ During installation, ensure that the diaphragm is not damaged.
Additional notes for UHP process connections (models WUC-10 and WUC-15)■ For VCR®-compatible connections, the union nut/pressure screw or fitting must be tightened beyond the hand-tight position(depending on the sealings used) using a 1/8 or 1/4 turn.
■ For weld-in connections, the flow of argon during the welding process is recommended for cooling.
Rework
1. The zero point must be adjusted, if necessary (→ see operating instructions).
2. Check all mechanical connections (threaded connections, welds) for leak tightness using a suitable test (e.g. helium leaktest).
3. Switch the gas flow on and off at least 10 times to remove any particles that may have entered during installation. The flowrate of the gas should correspond to the subsequent process flow.

WIKA data sheet IN 00.14 ∙ 07/2022

Page 2 of 10Additional information on the mounting of G1 hygienic and TRI-CLAMP® process connections■ Never loosen sealed filling screws on the measuring instrument.
■ For installation, in accordance with the fitting and flange standards the appropriate fastenings, such as screws, nuts or clamprings, must be used.
■ For flange mounting, only use sealings with a sufficiently large inner diameter and centre them. Contact with the diaphragmleads to measuring deviations.
■ When using a welding socket, position this so that the hole for leakage detection points downwards. Weld the welding socket
flush with the inner wall of the vessel and grind down. The surface roughness of the ground surfaces must be Ra ≤ 0.8 μm.
■ When using soft or PTFE sealings, observe the instructions of the sealing manufacturer, particularly with regard to tightening
torque and load cycles.
Spanner flats

Spanner flats

Sealing variants
Parallel threads
For sealing, use flat gaskets, lens-type
sealing rings or WIKA profile sealings at thesealing face .

per EN 837

per DIN EN ISO 1179-2(formerly DIN 3852-E)

Tapered threads
For sealing, the thread is wound withadditional sealing material, e.g. PTFE tape.
NPT, R and PT→ For information on sealings, see WIKA data sheet AC 09.08 at www.wika.com.

WIKA data sheet IN 00.14 ∙ 07/2022

Page 3 of 10Versions
Dimensions of the process connections in mm [in]For flush process connections, see table on page 7.
The tapped holes are only shown for WIKA-specific threads. For all other tapped holes, observe the applicablestandards.
Non-flush process connections
StandardThread

ANSI/ASME B1.20.1

⅛ NPT

Dimensions (process connection at instrument) in mm [in]G: 1/8 NPT

Sketch (process connection atinstrument)

L1: 10 [0.39]¼ NPT

G: 1/4 NPT
L1: 13 [0.51]½ NPT

G: 1/2 NPT1/4 NPT, female thread(for models A-10 and S-20)

G: 1/4 NPT-I

L1: 19 [0.75]
D1: 25 [0.98]
L1: 14 [0.55]
L2: 20 [0.79]

1/4 NPT, female thread(for model O-10)

G: 1/4 NPT-I
D1: 19 [0.75]
L1: 17 [0.67]
L2: 14 [0.55]

1/4 NPT, female thread(for models C-10, E-10,F-20, N-10, P-30 and S-10)

G: 1/4 NPT-I
D1: 25 [0.98]
L1: 10 [0.39]
L2: 14 [0.55]

DIN 16288

M12 x 1.5

G: M12 x 1.5
L1: 13 [0.51]

M20 x 1.5G: M20 x 1.5
L1: 20 [0.79]

DIN EN ISO 1179-2(formerly DIN 3852-E)

G 1/4 A

G: G 1/4 A
L1: 14 [0.55]

G 1/2 A

G: G 1/2 A
L1: 17 [0.67]

M14 x 1.5

G: M14 x 1.5
L1: 14 [0.55]

WIKA data sheet IN 00.14 ∙ 07/2022

Page 4 of 10

StandardThread

EN 837

G 1/8 B

Dimensions (process connection at instrument) in mm [in]G: G 1/8 B

Sketch (process connection atinstrument)

L1: 10 [0.39]

G 1/4 B

G: G 1/4 B
L1: 13 [0.51]

G 3/8 B

G: G 3/8 B
L1: 16 [0.63]

G 1/2 B

G: G 1/2 B
L1: 20 [0.79]

G 1/4, female thread(for models A-10, PSD-30,PSD-4 and S-20)

G: G 1/4-I
D1: Ø 25 [0.98]
L1: 20 [0.79]
L2: 13 [0.51]
L3: 10 [0.39]

G 1/4, female thread(for model S-10)

G: G 1/4-I
D1: Ø 17.5 [0.69]
L1: 19.5 [0.77]
L2: 13 [0.51]
L3: 10 [0.39]

G 1/4, female thread(for model O-10)

G: G 1/4-I
D1: Ø 19 [0.75]
L1: 17 [0.67]
L2: 13 [0.51]
L3: 10 [0.39]-Flange connection

Diameter 5 mm

ISO 6149-2

M14 x 1.5

G: M14 x 1.5

ISO 7

R 1/4

L1: 13.5 [0.53]

G: R 1/4
L1: 13 [0.52]

R 3/8

G: R 3/8
L1: 15 [0.59]

R 1/2

G: R 1/2
L1: 19 [0.75]

WIKA data sheet IN 00.14 ∙ 07/2022

Page 5 of 10

Standard

ThreadDimensions (process connection at instrument) in mm [in]JIS B2351-1

G 1/4 x 10, form O withcollar

G: G 1/4 x 10

G 3/8, form O with collar

G: G 3/8

Sketch (process connection atinstrument)

L1: 10 [0.39]
L1: 12 [0.47]

KS B 0222

PT 1/4

G: PT 1/4
L1: 13 [0.52]

PT 3/8

G: PT 3/8
L1: 15 [0.59]

PT 1/2

G: PT 1/2
L1: 19 [0.75]

SAE J514

3/4-16 UNF-2A
O-ring BOSS

G: 3/4-16 UNF-2A

7/16-20 UNF-2A
O-ring BOSS

G: 7/16-20 UNF-2A

9/16-18 UNF-2A
O-ring BOSS

G: 9/16-20 UNF-2A

7/16-20 UNF-2A 74°

G: 7/16-20 UNF-2A cone 74°

L1: 11.13 [0.44]

L1: 12.06 [0.48]
L1: 12.85 [0.51]

L1: 15 [0.59]
SAE J513 compatible

7/16-20 UNF-2A 90°

SAE J515 compatible

7/16-20 UNF-2B, Schrader
connection

G: 7/16-20 UNF-2A cone 90°
L1: 15 [0.59]

G: 7/16-20 UNF-2B
L1: 16 [0.63]
L2: 8.4 [0.33]
L3: 6.5 [0.26]

Ermeto compatible

G 1/4, female thread (formodel PSD-4)

G: G 1/4-I
L1: 20 [0.79]
L2: 15 [0.59]
L3:12 [0.47]
D1: 25 [0.98]
G: G 1/4-I
L1: 20 [0.79]
L2: 17.5 [0.689]
L3: 14 [0.55]
D1: 26.5 [1.04]

WIKA data sheet IN 00.14 ∙ 07/2022

14280340

G 1/4, female thread (formodel TIS-20)

Page 6 of 10

Flush process connections

G 1/2 B

G: G 1/2 B

Sketch (process connection atinstrument)

Sketch (tapped hole withdimensions)
mm values

D1: 18 [0.71]

A

L1: 23 [0.91]⏊ 0,1 A

L2: 20.5 [0.807]

0⌀21,3-0,2G1/2⌀19,2+0,1045°

Rz 16
13±0,2EN 837

Dimensions (processconnection at instrument) in mm [in]Rz 16

L3: 10 [0.39]

21±0,2Thread

11+0,50Standard-0,415°

Rz 4⌀18,2+0,10

inch values⌀0,839+0,0000-0,0078
G1/2A

Rz 16

0,83±0,0078

Rz 16- units: inch
- surface texture: ISO 1302

0,43+0,0196-0,000045°⏊ 0,004 A

0,51±0,0078⌀0,756+0,0039-0,0000-0,01615°

Rz 4⌀0,717+0,0039-0,0000

mm values

L2: 20.5 [0.807]

G1A

45°

⌀30,5+0,10⏊ 0,1 A

015-0,2

L3: 10 [0.39]

Rz 16
21±0,2

L1: 23 [0.91]

0⌀33,5-0,2

min. 10,5

D1: 30 [1.18]

2

G: G 1 BR0,G1B

Rz 16-0,4⌀30,1+0,10

inch values⌀1,319+0,0000-0,0078
G1A

0,83±0,0078

0,59+0,0000-0,0078

45°

min. 0,413

R0,⏊ 0,004 A008

⌀1,201+0,0039-0,0000Rz 16-0,016
Rz 16- units: inch
- surface texture: ISO 1302

⌀1,185+0,0039-0,0000

WIKA data sheet IN 00.14 ∙ 07/2022

Page 7 of 10

mm values

D1: 29.5 [1.61]⌀30,8+0,10
Rz 16
25,5±0,05

6,5°

Rz 16

-0,05
-0,2

17,5±0,2

1±0,1-0,5-0,3⏊ 0,1 A(0,5)

L3: 15.5 [0.61]

G1A

L1: 25 [0.98]
L2: 9 [0.35]⌀34±0,321,4+0,20

G: G 1 B (hygienic)

Sketch (tapped hole withdimensions)

1x45°

G1B
hygienic

Sketch (process connection atinstrument)

5±0,1

EN 837

Dimensions (processconnection at instrument) in mm [in]1,1±0,05

Thread30°Standard

Rz 4

Rz 420°◎ ⌀0,05 A⌀29,3±0,05⌀30,5+0,50

inch values⌀1,34±0,0118
G1

Rz 4

WIKA data sheet IN 00.14 ∙ 07/2022⌀1,154±0,0019⌀1,201+0,019-0,0000,689±0,0078

6,5°

1,004±0,0019

0,843+0,0078-0,0000

Rz 16

Rz 4

14280340

20°- units: inch
- surface texture: ISO 1302

0,043±0,00196-0,002-0,008◎ ⌀0,002 A

0,04±0,0039

30°-0,020-0,012Rz 16(0,02)⏊ 0,004 A

0,04x45°⌀1,213+0,0039-0,00000,2±0,0039

A

Page 8 of 10

UHP process connections
Thread1/4" weld stub(Max. available pressure: 300 psi)

Sketch (process connection at instrument)

1/4" pressure screw,
rotatable
VCR compatible

1/4" T-connector, weldstubNotes■ The sketches of the process connections shown are not to scale.

■ For customer-specific versions of the pressure sensors or pressure switches, other process connections can also be used,depending on agreement. The dimensions are then part of the respective agreement and correspond to the requirements ofthe customer's specification.

WIKA data sheet IN 00.14 ∙ 07/2022

Page 9 of 10

Process connections G 1 hygienic and TRI-CLAMP®
G1 hygienic

Profile sealing, nonwetted®

O-ring, wetted

Suitable for WIKA adapter system model 910.61
For dimensions of the appropriate process adapters and welding sockets see data sheet AC 09.20
With clamp connection (TRI-CLAMP®)

1)®

TYPE EL
CLASS IFEBRUARY 2021

VersionClamp connection(TRI-CLAMP®) 2)

Dimensions in mm
Ø Mb

Ød

ØD

1 ½" suitable for clamp connections per ASME BPE 1 1/2", DIN 32676
row A DN 40, row C DN 1 1/2", BS 4825 part 3 DN 38.1

3243.550.5

2" suitable for clamp connections per ASME BPE 2", DIN 32676 row A
DN 50, row B DN 42.4 and 48.3, row C DN 2", BS 4825 part 3 DN 50.84056.6641) EHEDG conformity only in combination with the clamp connection with a T-ring seal from Combifit Metaalbewerking B.V.
2) For maximum pressure range consider pressure rating of clamp.

07/2022 EN© 04/2003 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 00.14 ∙ 07/2022

Page 10 of 10WIKA Alexander Wiegand SE & Co. KG
Alexander-Wiegand-Straße 3063911 Klingenberg/GermanyTel.
+49 9372 132-0
Fax+49 9372 132-406
info@wika.de
www.wika.de