Bourdon Tube Gauge WIKA Model 213.53

The Bourdon-tube gauge, invented about 1850, is still one of the most widely used instruments for measuring the pressure of liquids and gases of all kinds, including steam, water, and air up to pressures of 7,000 Bar.

The device (also shown in the figure) consists of a flattened circular tube coiled into a circular arc. One end is soldered to a central block and is open to the fluid whose pressure is to be measured; the other end is sealed and coupled to the pointer spindle.

When the pressure inside the tube is greater than the outside pressure, the tube tends to straighten, thus turning the pointer. The pressure is read on a circular scale.

Applications

For measuring points with high dynamic pressure loads or vibrations
For gaseous and liquid media that are not highly viscous or crystallizing and will not attack copper alloy parts
Hydraulics
Compressors, shipbuilding

Technical Data

Design

EN 837-1

Bourdon tube pressure gauges, dimensions, metrology, requirements, and testing

Nominal size in mm

50, 63, 100

Accuracy class

NS 50, 63: 1.6
NS 100: 1.0

Scale Ranges

NS 50: 0 … 1 to 0 … 400 bar
NS 63, 100: 0 … 0.6 to 0 … 1000 bar

or all other equivalent vacuum or combined pressure and vacuum ranges

Pressure limitation

NS 50, 63:

Steady: 3/4 x full-scale value
Fluctuating: 2/3 x full-scale value
Short time: Full-scale value

NS 100:

Steady: Full-scale value
Fluctuating: 0.9 x full-scale value
Short time: 1.3 x full-scale value

Permissible temperature

Ambient: -20 … +60 °C
Medium: +60 °C maximum

Temperature effect

When the temperature of the measuring system deviates from the reference temperature (+20 °C): Max. ±0.4 %/10 K of the span

Ingress protection

IP 65 per EN 60529 / lEC 529

Process connection

Cu-alloy, lower mount (LM) or back mount (BM),
NS 50, 63: G ¼ B (male), 14 mm flats
NS 100: G ½ B (male), 22 mm flats

Pressure element

NS 50, 63:

< 60 bar: Cu-alloy, C-type
≥ 60 bar: Cu-alloy, helical type

NS 100:

< 100 bar: Cu-alloy, C-type
≥ 100 bar: Stainless steel 316L, helical type

Movement

Cu-alloy

Dial

NS 50, 63: Plastic ABS, white, with pointer stop pin
NS 100: Aluminium, white, black lettering

Pointer

NS 50, 63: Plastic, black
NS 100: Aluminium, black

Window

Plastic, crystal-clear

Case

Natural finish stainless steel, with pressure relief at case circumference, 12 o’clock.

O-ring seal between case and connection. The scale ranges ≤ 0 … 16 bar with compensating valve to vent case.

Bezel ring Crimp ring, glossy finish stainless steel, triangular bezel

Filling liquid

Glycerine 99.7 %

Bourdon Tube Gauge WIKA Model 213.53