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The S8000 Integrale cooled-mirror hygrometer from Michell Instruments provides reliable drift-free dew-point measurements in vacuums as low as 0.05mbar.

The hygrometer is suitable for applications such as the oil refilling of transformers, which involves vacuum pumping.

Many high-voltage transformers, especially those switching many thousands of kVA (such as the types found in power-plant substations), are filled with a refined mineral oil.

This serves several purposes; the oil must act as a main part of the transformer’s insulation, although it also serves to cool the transformer.

Moisture inside transformers adversely affects the dielectric and insulating properties of the oil.

Vacuum pumping the transformer enclosure is a common practice in the industry, with the sole purpose of minimising the total moisture content prior to oil filling.

Optimal dryness is desirable at this critical stage and a reliable, accurate dew-point measurement enables users to monitor the process and to ensure that moisture is eliminated as much as possible.

Together with its low-pressure capability, the S8000 can measure dew points as low as -60C with 0.1C accuracy.

Its fundamental chilled-mirror technology is drift free so measurements are reliable over time.

The design of the sensor head allows for excellent sealing in high-pressure, low-pressure and vacuum applications.

Michell Instruments

Michell Instruments is an international leader in high-precision sensing with over 35 years’ experience in the field, specialising in instrumentation for dew point, relative humidity and oxygen analysis. The company serves industries as diverse as petrochemical and pharmaceutical to power generation and food processing. The product range includes:

  • High-precision ceramic moisture sensors to measure trace moisture in process applications.
  • Relative humidity transmitters and sensors for use in HVAC applications, pharmaceutical storage and other production processes where controlled environmental conditions are crucial.
  • Humidity calibration systems and reference dew-point hygrometers enable customers to carry out the calibration of portable hygrometers and relative humidity instruments in-house, saving on downtime and costs.
  • Zirconia and thermo-paramagetic oxygen analysers for combustion optimisation, maintaining gas purity, controlling levels of CO2 in breweries and many other applications.
  • Condumax II Hydrocarbon dew point analysers ensure the quality of natural gas at custody transfer, prevent gas burner failure and the prolong the life of process equipment, helping companies save millions of dollars on repairs and downtime.
  • Trace moisture in hydrocarbon liquids analysers are available in explosion-proof and instrinsically safe versions and allow the continuous measurement of moisture content in a wide range of applications from transformer oil, petrochemical factions and pure hydrocarbons.
  • Process moisture analysers provide continuous on-line measurements of trace moisture in process gases and are available as explosion-proof, instrinsically safe and laboratory versions.

Michell Instruments has three manufacturing locations: Oosterhout, The Netherlands; Lyon, France and Ely, UK. The company has an extensive network of factory-trained application engineers, subsidiaries and distributors stretching across 56 countries.

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