Pressure

Bourdon tube pressure gauge, stainless steel

Compact version, NS 40 [1 ½"], 50 [2"] and 63 [2 ½"]
Model 131.11
WIKA data sheet PM 01.05

For further approvals,

see page 5

Applications Configurator

■ For gaseous and liquid aggressive media that are

not highly viscous or crystallising, also in aggressive
environments
■ Machine building and general plant construction
■ Indication of failure alarm on gas cylinders
■ CDA (Clean Dry Air) applications

Special features
■ Case and wetted parts from stainless steel
■ Version per EN 837-1 or ASME B40.100
■ Cost-effective and reliable
■ Scale ranges from 0 ... 1 to 0 … 1,000 bar [0 ... 15 to
0 ... 15,000 psi]
Bourdon tube pressure gauge model 131.11.050 with
dual scale bar/psi

Description

The compact model 131.11 Bourdon tube pressure gauge Due to the use of high-quality stainless steel materials and
is constructed with a case and wetted parts from stainless its robust design, the instrument is suitable for liquid and
steel. gaseous media, also in aggressive environments.

The modular design enables a multitude of combinations of For mounting in control panels, the pressure gauges can
process connections, nominal sizes and scale ranges. Due to be fitted with a surface mounting flange or with a triangular
this high variance, the instrument is suitable for use in a wide profile ring and mounting bracket.
range of applications within industry.

The instrument is frequently used as a failure alarm indica-

tor on gas cylinders. With its compact design and moder-
ate purchase costs, the pressure gauge also qualifies for
machine-building and plant-construction applications.

WIKA data sheet PM 01.05 ∙ 04/2025 Page 1 of 7

Data sheets showing similar products:

Standard version, NS 63 [2 ½"], 100 [4"] and 160 [6"]; models 232.50, 233.50;
see data sheet PM 02.02
Safety version, NS 63 [2 ½"], 100 [4"] and 160 [6"]; models 232.30, 233.30;
see data sheet PM 02.04
Specifications
Basic information
Standard ■ EN 837-1
■ ASME B40.100

→ For information on the “Selection, installation, handling and operation of pres-

sure gauges”, see technical information IN 00.05.
Special design feature ■ Oil- and grease-free
■ For oxygen, oil- and grease-free 1)
■ Silicone-free
■ Version for ammonia plants
With temperature scale for refrigerant R 717 (NH3) in °C
Scale range: -1 ... 0 ... 15 bar or -1 ... 0 ... 26 bar
Nominal size (NS) ■ Ø 40 mm [1 ½"]
■ Ø 50 mm [2"]
■ Ø 63 mm [2 ½"]

Connection location ■ Lower mount (radial)

■ Centre back mount

Window ■ Polycarbonate, snap-fitted in case

■ Laminated safety glass 2)
■ Instrument glass 2)

Case
Design Lower mount (radial) Safety level “S1” per EN 837-1: With blow-out device at
case circumference, 6 o”clock
Centre back mount ■ Safety level “S0” per EN 837-1
■ Safety level “S1” per EN 837-1: With blow-out device
in case back
Material Stainless steel
Ring ■ Without
■ Slip-on bezel, stainless steel
■ Slip-on bezel, stainless steel, polished

Mounting ■ Without
■ Panel mounting flange, polished stainless steel 3)
■ Triangular profile ring with mounting bracket, polished stainless steel 3)
■ Surface mounting flange, stainless steel 4)
Movement Stainless steel

1) Not available for NS 63 [2 ½"]

2) Only available with slip-on bezel
3) Only available with centre back mount
4) Only available for NS 63 [2 ½"]

Measuring element
Type of measuring element Bourdon tube, C-type or helical type
Material Stainless steel 1.4404 (316L)
Leak tightness Helium tested, leakage rate: < 5∙10-3 mbar l/s

Accuracy specifications
Accuracy class
■ EN 837-1 ■ Class 2.5
■ Class 1.6

■ ASME B40.100 ■ ±3 % of measuring span (grade B)

■ ±2 % of measuring span (grade A)

Temperature error On deviation from the reference conditions at the measuring system:
≤ ±0.4 % per 10 °C [≤ ±0.4 % per 18 °F] of full scale value
Reference conditions
Ambient temperature +20 °C [68 °F]

WIKA data sheet PM 01.05 ∙ 04/2025 Page 2 of 7

Scale ranges, gauge pressure

bar psi
0 ... 1 0 ... 40 0 ... 15 0 ... 800
0 ... 1.6 0 ... 60 0 ... 30 0 ... 1,000
0 ... 2 0 ... 70 0 ... 60 0 ... 1,500
0 ... 2.5 0 ... 100 0 ... 100 0 ... 2,000
0 ... 4 0 ... 140 0 ... 150 0 ... 3,000
0 ... 6 0 ... 160 0 ... 160 0 ... 4,000
0 ... 7 0 ... 200 0 ... 200 0 ... 5,000
0 ... 10 0 ... 250 0 ... 250 0 ... 6,000
0 ... 14 0 ... 315 0 ... 300 0 ... 7,500
0 ... 16 0 ... 400 0 ... 400 0 ... 10,000 1)
0 ... 20 0 ... 600 0 ... 500 0 ... 15,000 1)
0 ... 25 0 ... 700 1) 0 ... 600 -
0 ... 30 0 ... 1,000 1)

kPa MPa
0 ... 100 0 ... 4,000 0 ... 0.1 0 ... 4
0 ... 160 0 ... 6,000 0 ... 0.16 0 ... 6
0 ... 200 0 ... 7,000 0 ... 0.20 0 ... 7
0 ... 250 0 ... 8,000 0 ... 0.25 0 ... 10
0 ... 300 0 ... 10,000 0 ... 0.4 0 ... 14
0 ... 400 0 ... 14,000 0 ... 0.6 0 ... 16
0 ... 600 0 ... 16,000 0 ... 0.7 0 ... 20
0 ... 700 0 ... 20,000 0 ... 1.0 0 ... 25
0 ... 800 0 ... 25,000 0 ... 1.4 0 ... 31.5
0 ... 1,000 0 ... 40,000 0 ... 1.6 0 ... 40
0 ... 1,400 0 ... 60,000 0 ... 2 0 ... 60
0 ... 1,600 0 ... 70,000 1)
0 ... 2.5 0 ... 70 1)
0 ... 2,500 0 ... 80,000 1)
0 ... 3 0 ... 100 1)
0 ... 3,000 0 ... 100,000 1)

1) Only available for NS 63 [2 ½"]

Vacuum and compund scale ranges

bar psi
-1 ... 0 -1 ... +7 -30 inHg ... 0 -30 inHg ... +100
-1 ... +0.6 -1 ... +9 -30 inHg ... +15 -30 inHg ... +160
-1 ... +1 -1 ... +10 -30 inHg ... +30 -30 inHg ... +200
-1 ... +1.5 -1 ... +15 -30 inHg ... +60 -30 inHg ... +300
-1 ... +3 -1 ... +25
MPa
-1 ... +5 -1 ... +30
-0.1 ... 0 -0.1 ... +0.5
kPa -0.1 ... +0.06 -0.1 ... +0.7
-100 ... 0 -100 ... +700 -0.1 ... +0.1 -0.1 ... +0.9
-100 ... +60 -100 ... +900 -0.1 ... +0.15 -0.1 ... +1
-100 ... +100 -100 ... +1,000 -0.1 ... +0.2 -0.1 ... +1.5
-100 ... +150 -100 ... +1,500 -0.1 ... +0.3 -0.1 ... +2.4
-100 ... +200 -100 ... +2,400 -0.1 ... +0.4 -0.1 ... +3
-100 ... +500 -100 ... +3,000

WIKA data sheet PM 01.05 ∙ 04/2025 Page 3 of 7

 Further details on: Scale ranges
Unit ■ bar
■ psi
■ kPa
■ MPa
■ kg/cm²
Vacuum resistance ■ Without
■ Vacuum-resistant to -1 bar

Dial
Scale colour Black
Material Aluminium
Customer-specific version ■ Without
■ With temperature scale for refrigerant, e.g. for NH3: R 717

Other scales or customer-specific dials, e.g. with red mark, circular arcs or circular
sectors, on request
→ Alternatively, adhesive label set for red and green circular arcs; see data sheet
AC 08.03
Pointer Aluminium, black
Pointer stop pin ■ Without
■ At zero point
■ At 6 o'clock

→ Other scale ranges on request

Process connection
Standard ■ EN 837-1
■ ISO 7
■ ANSI/B1.20.1

Size
EN 837-1 ■ G ¼ B, male thread
■ G ⅛ B, male thread
■ M14 x 1.5, male thread

ANSI/B1.20.1 ■ ¼ NPT, male thread

■ ⅛ NPT, male thread

ISO 7 ■ R ¼, male thread

■ R ⅛, male thread

Restrictor ■ Without
■ ∅ 0.6 mm [0.024"], stainless steel
■ ∅ 0.3 mm [0.012"], stainless steel

Material (wetted)
Process connection ■ Stainless steel 1.4571 (316Ti)
■ Stainless steel 1.4404 (316L)

Bourdon tube Stainless steel 1.4404 (316L)

→ Other process connections on request

Operating conditions
Medium temperature -40 ... +100 °C [-40 ... +212 °F]
Ambient temperature -40 ... +60 °C [-40 ... +140 °F]
Pressure limitation
Steady 3/4 x full scale value
Fluctuating 2/3 x full scale value
Short time Full scale value
Ingress protection per IEC/EN 60529 ■ IP54
■ IP65 1)

1) Only selectable for scale ranges from 0 ... 16 bar [0 ... 250 psi] and centre back mount

WIKA data sheet PM 01.05 ∙ 04/2025 Page 4 of 7

Approvals
Logo Description Region
EU declaration of conformity European Union
Pressure equipment directive
PS > 200 bar, module A, pressure accessory
- CRN Canada
Safety (e.g. electr. safety, overpressure, ...)
For scale ranges ≤ 1,000 bar

Optional approvals
Logo Description Region
EU declaration of conformity European Union
ATEX directive
Hazardous areas
- Ex h Gas II 2G Ex h IIC T6 ... T1 Gb X
Dust II 2D Ex h IIIC T85°C ... T100°C Db X

PAC Kazakhstan Kazakhstan

Metrology, measurement technology
- MChS Kazakhstan
Permission for commissioning
PAC Ukraine Ukraine
Metrology, measurement technology
PAC Uzbekistan Uzbekistan
Metrology, measurement technology
- PAC China China
Metrology, measurement technology
- KBA 2) International
Automotive
Components for motor vehicles using natural gas (CNG/LNG) – UN no. R 110

1) Not available for NS 63 [2 ½"]

2) Not available for all versions

Manufacturer’s declaration
Logo Description
- Pressure equipment directive (PED) for maximum allowable pressure PS ≤ 200 bar
- Suitability of wetted materials for drinking water in accordance with the European 4MS initiative

Certificates (option)
Certificates
Certificates ■ 2.2 test report per EN 10204 (e.g. state-of-the-art manufacturing, indication accuracy)
■ 3.1 inspection certificate per EN 10204 (e.g. indication accuracy)

Recommended calibration interval 1 year (dependent on conditions of use)

→ For approvals and certificates, see website

WIKA data sheet PM 01.05 ∙ 04/2025 Page 5 of 7

Dimensions in mm [in]

Model 131.11, lower mount (radial)

⌀D b

SW

2184087.02
G G a
ISO ANSI

NS G 1) Dimensions in mm [in] Weight in kg [lb]

D h ±1 [0.04] a b ±1 [0.04] SW
40 [1.5"] G ⅛ B, ⅛ NPT 39 [1.54] 36 [1.42] 9 [0.35] 25 [0.98] 14 [0.55] 0.05 [0.11]
G ¼ B, ¼ NPT 39 [1.54] 39 [1.54] 9 [0.35] 25 [0.98] 14 [0.55] 0.05 [0.11]
50 [2"] G ⅛ B, ⅛ NPT 49 [1.93] 44 [1.73] 9 [0.35] 29 [1.41] 14 [0.55] 0.09 [0.2]
G ¼ B, ¼ NPT 49 [1.93] 47 [1.85] 9 [0.35] 29 [1.41] 14 [0.55] 0.09 [0.2]
63 [2 ½"] G ⅛ B, ⅛ NPT 62 [2.44] 51 [2.01] 10 [0.39] 28 [1.1] 14 [0.55] 0.12 [0.26]
G ¼ B, ¼ NPT 62 [2.44] 54 [2.13] 10 [0.39] 28 [1.1] 14 [0.55] 0.12 [0.26]

1) The G ⅛ B process connection of this instrument is manufactured without a centring spigot and with a thread runout instead of a thread undercut.

WIKA data sheet PM 01.05 ∙ 04/2025 Page 6 of 7

 Model 131.11, centre back mount
NG 40/50/63 Anschluss rückseitig zentrisch
NS 1.5"/2"/2.5" connection backmounted centric
b2
⌀D b

SW

ISO
G

2184109.02
ANSI
G
2184109.02
NS G 1) Dimensions in mm [in] Weight in kg [lb]
D b2 b ±1 [0.04] SW
40 [1.5"] G ⅛ B, ⅛ NPT 39 [1.54] 52.5 [2.07] 27.5 [1.09] 14 [0.55] 0.05 [0.11]
G ¼ B, ¼ NPT 39 [1.54] 52.5 [2.07] 27.5 [1.09] 14 [0.55] 0.05 [0.11]
50 [2"] G ⅛ B, ⅛ NPT 49 [1.93] 53.5 [2.11] 29 [1.14] 14 [0.55] 0.09 [0.2]
G ¼ B, ¼ NPT 49 [1.93] 53.5 [2.11] 29 [1.14] 14 [0.55] 0.09 [0.2]
63 [2 ½"] G ⅛ B, ⅛ NPT 62 [2.44] 53.5 [2.11] 28 [1.1] 14 [0.55] 0.12 [0.26]
G ¼ B, ¼ NPT 62 [2.44] 53.5 [2.11] 28 [1.1] 14 [0.55] 0.12 [0.26]

1) The G ⅛ B process connection of this instrument is manufactured without a centring spigot and with a thread runout instead of a thread undercut.

Ordering information Configurator

Model / Nominal size / Connection location / Scale range /
Process connection / Options

© 02/2009 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.
In case of a different interpretation of the translated and the English data sheet, the English wording shall prevail.
04/2025 EN

WIKA data sheet PM 01.05 ∙ 04/2025 Page 7 of 7

WIKA Alexander Wiegand SE & Co. KG

Alexander-Wiegand-Straße 30
63911 Klingenberg/Germany
Tel. +49 9372 132-0
info@wika.de
www.wika.de