Applications for Bourdon tube brass gauges:

  • Intended for adverse service conditions where pulsation or vibration exists
  • Suitable for gaseous or liquid media that will not obstruct the pressure
  • Hydraulics and compressors

Special features of Bourdon tube brass gauges:

  • Vibration and shock resistant
  • Solid forged-brass case and socket
  • Pressure ranges up to 15,000 psi (1,000 bar)

Specifications of Bourdon tube brass gauges:

With a solid forged-brass case and socket, WIKA’s Bourdon tube brass gauge is designed for the most adverse conditions, including high vibration.

In fact, this brass gauge (model 213.40) is also known as WIKA’s “hydraulic gauge.” It is commonly used in mobile and stationary machinery hydraulic applications because of its ability to withstand extreme vibration, shock and pulsation.

ASME B40.100 & EN 837-1

2½” & 4” (63 & 100 mm)

Accuracy class
2½”:  ± 2/1/2% of span (ASME B40.100 Grade A)
4”:     ± 1% of span (ASME B40.100 Grade 1A)

Vacuum / Compound up to 200 psi (16 bar)
Pressure from 15 psi (1 bar) up to 15,000 psi (1,000 bar)
or other equivalent units of pressure or vacuum

Working pressure
2½”:  Steady: 3/4 scale value
Fluctuating: 2/3 full scale value
Short time: full scale value

4”:  Steady: full scale value
Fluctuating: 0.9 x full scale value
Short time: 1.3 x full scale value

Operating temperature
Ambient:  -4°F to +140°F (-20°C to +60°C) –
glycerine filled
-40°F to +140°F (-40°C to +60°C) –
silicone filled
Medium:  max. +140°F  (+60°C)

Temperature error
Additional error when temperature changes from reference temperature of 68°F (20°C) ±0.4% of span for every 18°F (10°K) rising or falling.

Weather protection
Weather tight (NEMA 4X / IP 66)

Brass gauge applications are expanding with the increasing introduction of portable equipment, such as compressors, pumps and hydraulic tools.

Brass gauges are also widely used in upstream oil applications with pressure ranges up to 15,000 psi.  In the Texas oil patch, WIKA’s brass gauges with glycerin fill are the standard.

Bourdon tube
2½” (63 mm) ≤ 870 psi (60 bar): C-shape copper alloy
2½” (63 mm) > 870 psi (60 bar): Helical copper alloy
4″ (100 mm) ≤ 1,000 psi (70 bar): C-shape copper alloy
4″ (100 mm) > 1,000 psi (70 bar): Helical stainless steel

Pressure Connection

  • Material: copper alloy
  • Lower mount (LM) or center back mount (CBM) –
    2½” (63 mm)
  • Lower mount (LM) or lower back mount (LBM) – 4” (100 mm)
  • 1/4” NPT or 1/2” NPT limited to wrench flat area

Copper alloy

White aluminum with black lettering, 2½” with stop pin

Black aluminum

Gold-painted forged brass with integral connection and vent plug

Bezel ring
Gold-plated ABS cover ring (2½”)
Chrome-plated brass cover ring (4″)

Acrylic with Buna-N gasket

Case fill
Glycerine 99.7%