WIKA Gas Density Monitor (GDM-100)


  • Medium and high-voltage instruments
  • Monitoring of the density of SF6 gas in closed tanks
  • Raising an alarm when defined limit values have been reached

Special Features

  • On-site display with switch contact
  • Temperature-compensated and hermetically sealed, therefore no influence of temperature fluctuations, differences in level and atmospheric pressure fluctuations
  • Compensation possible for gas mixtures
  • Functional check or recalibration possible without dismounting, in accordance with EU regulation no. 517/2014 on fluorinated greenhouse gases
  • Test connection is welded to prevent leakage

Sales Contact (Wika.sales@asyatrafo.com)




The WIKA gas density measuring instruments provide reliable warnings against dangerously low gas levels, even under extreme ambient conditions. Electrical switch contacts warn the plant operator when the gas density drops below defined levels due to leakage.

Via the on-site display, the pressure based on 20 °C [68 °F] can be read directly on the instrument.

With regard to switchgear safety, asset protection and environmental protection, it is common to perform functional checks on a regular basis. Article 5 of EU regulation no. 517/2014 on fluorinated greenhouse gases, provides for checking of the leakage detection system at least every 6 years if it contains > 22 kg SF6 gas and the plant was commissioned after 01 January 2017.

With the help of the firmly welded calibration valve, the gas density monitor can be shut off from the process and recalibrated without having to disassemble it. This not only reduces maintenance time but also minimises the risks of SFgas emissions and potential leakages during recommissioning.

When connecting a recalibration instrument (e.g. model ACS-10 or model BCS-10) to the recalibration valve, the gas density monitor is automatically disconnected from the
gas compartment and a recalibration can be performed. Following the recalibration process, the recalibration instrument can then be disconnected from the recalibration valve and the connection to the gas compartment is re-established automatically.

The recalibration valve is also available as a retrofit solution for gas density monitors already installed in the field, as model GLTC-CV, and can be mounted between the gas compartment and gas density monitor.


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