312.20 WIKA precision test gauge with bourdon tube

Description

The 312.20 WIKA precision test gauge with Bourdon tube is used for precision pressure measurement of gaseous and liquid media.

The Model 312.20 Mechanical Pressure Gauge has been specially designed for measuring pressures with high accuracy. The Bourdon tube pressure gauge with its accuracy class 0.6 is suitable for testing industrial-type pressure gauges or for precision measurement in laboratories.

For each measurement requirement you can select a range between 0 … 0.6 and 0 … 600 bar.

The 312.20 is made with a stainless steel body and wetted copper alloy parts. The instrument meets the requirements of the international industry standard EN 837-1 for Bourdon pressure gauges.

Optimum readability of the instrument with a nominal size of 160 mm is achieved by a knife-edge pointer and a dial with fine dividers. The parallax error supported by the optional mirror-band scale can be corrected.

You can create an optional DKD/DAkkS calibration certificate for this instrument.

A transport case (accessory) ensures safe storage and transport.

 

Features 312.20

• Design: EN 837-1
• Nominal size in mm: 160
• Accuracy class: 0.6
  • Option:
    • 0.25 (scale range ≤ 400 bar)
    • Class 3A per ASME B40.100 (scale range ≤ 400 bar)
• Scale range:
  • 0 … 0.6 bar [0 … 8.7 psi] to 0 … 600 bar [0 … 8.702.3 psi]
  • other available units (e.g. psi, kPa) or any other equivalent pressure and vacuum ranges
• Scale:
  • Uniform scale
  • Option:
    • Mirrored belt scale
• Pressure limit:
  • Constant: value of the full scale
  • Niha: 0.9 x total scale value
  • Short time: 1.3 x total value
• Location of the link:
  • Bottom bracket (radial)
  • Lower back support
• Process connector:
  • G ½ B
  • Others on request
• Allowable temperature:
  • Environment: -20 °C … + 60 °C
  • Medium:
    • +80 °C
    • Option:
      • +100 °C with special soft soldering
      • +200 °C (model 332.50, see data sheet PM 03.06)
• Temperature effect: when the temperature in the measuring system deviates from the reference temperature +20 °C: ≤ ± 0.4 % / 10 °C [≤ ± 0.4 % of the total scale value
• Ingress protection: IP54 to IEC/EN 60529
• Liquid filler: None
• Wetted materials:
  • Process link:
    • Copper alloy
  • Pressure element:
    • <100 bar: copper alloy, type C
    • ≥ 100 bar: 316L stainless steel, spiral type
• Non-humidified materials:

• Housing, bayonet ring:
  • stainless steel
  • Option:
    • triangular frame, polished stainless steel, with clamp
• Movement: copper alloy, wear parts argentan
• Dial: aluminium, white, black lettering
• Pointer: knife edge pointer, aluminium, black
• Window:
  • glass for instruments
  • Option:
    • Setting the zero point externally via an adjustable knob
• Adaptation medium
  • ≤ 25 bar: Gas
  • > 25 bar: liquid
  • Option:
    • Gas from a range ≥ 25 bar

To view additional options and more technical features, we recommend viewing the attached .pdf documents under the Documentation section.

 

Areas of use, applications

• high-precision pressure measurement
• precision measurement in laboratories
• testing of industrial-type pressure gauges
• for gaseous and liquid agents which are not highly viscous or crystallising and will not attack copper alloy parts

 

ELPRO designation: MAN-312.20