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973-SF6 Gas Analyzer | SF6 Humidity & Purity Test |
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973-SF6 gas analyser


The 973-SF6 is an advanced SF6 gas analyzer for the measurement of humidity, SF6 purity and SO2 concentration in SF6 gas insulated switchgears (GIS) and other high voltage equipment. With its internal gas containment and recovery system, the 973-SF6 provides a high quality and environmentally safe measurement solution within a single self-contained unit.


973-SF6 gas analyzer used for simultaneous measurement of humidity, SF6 purity and SO2 concentration. Pure SF6 is the standard filling within GIS, but over time gas compartments become contaminated with water vapor (H2O) through permeation and by desorption from internal materials. Whilst water vapor and SF6 do not normally react with each other, in the presence of a high-energy discharge, hydrogen and oxygen disassociated from water vapor will react with the sulfur and fluorine from SF6 to form decomposition by-products. These include sulfur dioxide (SO2) and hydrofluoric acid (HF) that are corrosive to the internal components of gas compartments.

SF6 with low water vapor content (low humidity) significantly reduces the potential for formation of these corrosive compounds, which is why accurate and repeatable measurement data is an invaluable part of any GIS preventative maintenance program.

The 973-SF6 gas analyzer is supplied as a complete set that includes:

  • 973-SFInstrument
  • Transport Peli-Case 1620
  • 6 m Stainless Steel armored PTFE tubing
  • SFcoupling DN8 with quick coupling (Rectus)
  • SFcoupling DN20 with quick coupling (Rectus)
  • 90° Angle for Rectus-Coupling
  • Serial cable DB9 3m 1:1 male/female
  • RS-232 / USB Adapter
  • USB stick with 973-SF6  Software and operation manuals
  • Power cable (country specific)
  • Hex key for SOmodule
  • SODummy sensor
  • Cotton swabs, sterile (10 pieces)
  • Operation Manual (2 pieces)
  • Calibration Certificate

All accessories can also be ordered separately to replace damaged or missing components.

  • Features
  • Key Specifications
  • Typical Applications
  • Accessories & Spare Parts
  • Downloads
  • Media

  • Simultaneous measurement of humidity, SF6 purity and SO2 concentration
  • Integrated gas recovery system with automatic pump back
  • Fully automated SF6 gas testing
  • Fundamental drift-free measuring principle
  • Measurement results at SF6 compartment or standard pressure
  • Intuitive color touch screen user Interface
  • User verifiable calibration
  • Robust case for easy transportation
Key Specifications

  • Frost/dew Point range: -50…+20 °C
  • Volume SF6 range: 80…100%
  • Inlet pressure range: 120…1’000 kPa abs.
  • Frost/dew point accuracy: ± 0.5 °C
  • ppmv /ppmw accuracy: ± 1 ppm +6% of reading
  • Volume SF6 accuracy: ± 0.5%
  • Pressure accuracy: ± 3 kPa
Typical Applications

  • Electrical Power Utilities
  • Gas insulated switchgear
  • SF6 gas manufacturers and suppliers