Precise dew point measurement of SF6

MBW 973-SF6

zero emmission measurement
measurement of dew point & SO2
fully automated SF6 measurement

Download a datasheetRequest a quoteCall us


Measuring dew point of Sulphur hexafluoride (SF6) with zero emissions.

The MBW973-SF6 analyser allows measurements to be made without venting the measured gas. The system combines an integral pump and cylinder, passing sample gas through the measurement head to be stored. When testing is complete, the gas can be returned by pumping it back into the gas system. 

Sulphur Dioxide (SO2) measurements

An optional and integrated electrochemical cell monitors SO2 levels with a measurement range of either 0 to 100 ppmv or 0 to 500 ppmv.

SF6 SO2 measurement MBW973 SF6


The precision chilled mirror device to accurately determine dew point, and a simultaneous sulfur dioxide measurement combine to indicate sulfur hexafluoride (SF6) purity.


Measuring range

Frost/Dew point

-50 to +20 °C

Humidity content by volume

40 to 20,000 ppm

Humidity content by weight

5 to 2,500 ppm

Volume SF6

80 to 100 %

Inlet pressure

120 to 1,000 kPa abs.


Frost/Dew point

≤ ± 0.5 °C


≤ ± 1 ppm +6 % of reading

Volume SF6

≤ ± 0.5 %


≤ ± 3 kPa

Standard Features

Digital I/O


Thermoelectric mirror cooling


Mirror Temperature Sensors

RTD (Pt100)


5.7" LCD with touch screen

Internal gas tubes

Stainless steel 316L / FEP

SO2 preparation

Mechanically and electrically prepared, measurement cell cover fitted

Gas connections

Self-sealing quick connect fitting (Swagelok® QM series)


Self-sealing SF6 coupling DN8 (VK/F-02/8) and DN20 (VK/F-02/20)

External sample gas tube

Self-sealing 6 m stainless steel armoured PTFE tubing


Optimum Response Injection System

Transport case

Custom fit foam lined Peli 1620

Power cable

2.5 m

Operating instructions

English, German, French, Italian or Spanish

Calibration certificate

Pressure calibration, 2-point dew/frost point, 3-point %volume SF6

Optional Features

Internal SO2 module




Measuring range

0 to 100 ppm or 0 to 500 ppm


< 2 % of range

Sensitivity drift

≤ 5 %/year


2 years in normal operation

Additional Information

Pump back pressure maximum

900 kPa



Operating conditions

-10 to +40 °C, maximum 98 %rh non-condensing, altitude up to 2000 m

Storage conditions

-20 to +50 °C

Outdoor use

Permissible, instrument must be protected against exposure to water


In Transport Case


420 mm

650 mm


155 mm

370 mm


390 mm

510 mm


16.5 kg

32 kg


Supply voltage

100 to 120 VAC / 200 to 240 VAC, 50/60 Hz (auto switching)

Supply voltage fluctuations

up to ±10 % or nominal voltage / overvoltage category II Rated pollution degree 2

Power consumption

200 Watt

All specifications subject to change