Sf6 analyzer - Transdox 3100C SF6 multigas analyzer

Transdox 3100C SF6 multigas analyzer

Transdox 3100C SF6 multigas analyzer

Regular checking of SF6 gas insulated substations allows fault preventative maintenance programs to be implemented, and increases the life cycle of the SF6.

The Transdox 3100C is the latest high precision gas analyzer designed for controlling and monitoring the quality of SF6 in gas insulated sub-stations and circuit breakers. Three different models of the analyzer (CA, CB and CC) not only measures the SF6 purity over the full range, but depending on model also measures the H2O content of the SF6 which is essential when monitoring the dielectric strength of the gas, together with the decomposition gas SO2 and HF.

The analyzer simultaneously measures SF6, SO2, HF and H2O. Using an infra-red SF6 detector, the analyzer offers exceptional accuracy and stability when measuring the purity of SF6. The decomposition products of SF6 can be identified by analyzing the HF and/or SO2 content of the gas; this forms from the breakdown of SOF2 and SOF4 after an electrical discharge. The analyzer incorporates two electrochemical, SO2 and HF sensors to measure ppm levels. The dew-point of the gas (in ppmV or °C) is an important parameter to measure as this has an effect on the dielectric properties of SF6. The Transdox is fitted with a special high-speed dew-point sensor fitted with a system allowing stable measurements in less than three minutes.

All gases are analyzed and data-logged simultaneously and just a few minutes are required to get a stable reading. The Transdox has both on-board and software-based data-logging for full flexibility. The analyzer has a gas output nozzle allowing all sampled gas to be recovered and recycled, ensuring that no SF6 gas is released into the atmosphere (in accordance with the Kyoto agreement).

The analyzer can be supplied as a bench style instrument or a full kit in a transport suitcase, with a range of DILO compatible sampling hoses, couplings and a printer. Low-cost SF6 gas recovery bags are available to ensure no gas escapes into the atmosphere when using the Transdox.


  • Continuous gas sampling of SF6 - SO2 - HF - H2O
  • High precision infra-red gas detector for SF6 purity over the range 0-100%
  • Electrochemical SO2 sensor for trace analysis of contamination gas 0-100ppm or 0-500ppm
  • Electrochemical HF sensor for trace analysis of contamination gas 0-10ppm
  • High speed dew-point sensor for moisture analysis -65°C to + 20°Cdp (or ppmv)
  • Input pressure 0.5 to 10 bar with safety blow off valve
  • Gas flow rate 0.1 - 1 litre per minute controlled by flow gauge
  • Programmable alarms with outputs and visual warning
  • RS232 / RS485, 0-5V and 4-20mA current loop outputs (all user programmable)
  • On board data-logger with 2048 sample points
  • Windows data logging software with MS-Excel compatible graphing
  • Supplied with a 2m armored sampling hose with DILO compatible fittings
  • Full sample kit available (sample hoses, DILO couplings, printer, Peli-case)
  • SF6 gas recovery bag available
  • Compatible with DILO style gas recovery systems


  • Controlling SF6 quality in switches, bus bars and circuit breakers in Gas Insulated Substations (GIS)
  • SF6 insulated devices in power stations
  • Checking for the buildup of corrosive decomposition products such as HF and SO2 present in the SF6
  • Measuring the moisture content of SF6 gas by using a dew-point analyzer
  • Applying a condition based maintenance program (CBM) to extend the life cycle of the SF6
  • Detecting the presence of leaks and SF6 discharge
  • Indication of arcing and breakdown through the buildup of corrosive by-products

Specifications Transdox 3100C SF6

Technical Data: Analyzer


90-260Vac, 50/60Hz

Analyzer dimensions

350mm x 263mm x 150mm


7 kg


20 x 4 characters (9mm) back lit LCD. Displays SF6-H2O-HF-SO2, pressure, temperature, date & time

Warm up time

3-4 minutes at 20°C

Operating temperature

-10°C to 40°C

Max inlet pressure

10 bar (protected)

Voltage outputs

0-5V linear, user-programmable

Current outputs

4-20mA linear, user-programmable

Digital outputs

RS232 (RS485 option available): data streamed on demand


100 to 1000 ml.min-1

Data Log

On board data logger with 2048 sample points

Technical Data: Sensor

SF6 Sensor

Infra-Red 0-100%; ± 0.5% FS accuracy; Resolution 0.1%

H2O Sensor

-65°C to +20°Cdp; ± 2°Cdp accuracy of reading*; Resolution 0.1°Cdp

SO2 Sensor

Electrochemical Cell 0-100ppm or 0-500ppm; ± 2% FS accuracy; Resolution 0.1ppm

HF Sensor

Electrochemical Cell 0-10ppm; ± 2% FS accuracy; Resolution 0.1ppm

Life expectancy

2-3 years: HF & SO2, >5 years SF6 & H2O

Measurement time

3-5 minutes


SF6, HF and SO2 user selectable cal gas values. H2O sensor factory fixed

* Minimum accurate reading possible with this sensor is -60°Cdp. Sensor will respond from wet to dry in approximately three minutes.

Optional Accessories

  • Optional Transdox Gas Recovery Bag
  • Optional Transdox Sampling Kit
    • Transdox 3100C analyzer (CA, CB, CC or CD)
    • Handle
    • Set of DN8 and DN20 DILO fittings with 2m hose
    • Thermal printer
    • Heavy duty Peli-style case
Optional Transdox Gas Recovery BagOptional Transdox Sampling KitOptional Transdox Sampling Kit - Transdox 3100C SF6 multigas analyser

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