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A European food processing manufacturer has chosen Michell’s PF211 relative humidity (RH) transmitter to control humidity and temperature in its range of fermentation chambers.

Designed for small-to-medium bakeries, fermentation chambers provide a consistent environment for bread dough and yeasted products to rise and prove.

The cabinets are insulated with air-conditioning systems to accurately control both temperature and humidity as well as a flow of fresh air.

Previously, in small or artisan bakeries, mixing, kneading and fermentation would be a manual process.

The development of these cabinets enables the automation and regulation of part of this process and is said to ensure more consistent results.

The challenge for the manufacturer is to reliably control humidity across the wide range of temperatures required in bread making, from proving (rising dough at a warm temperature) to retardation (where bread dough is kept to rise at a low temperature for up to 12 hours to develop flavour).

The PF211 probe was chosen because of its wide measurement range – from zero per cent to 100 per cent RH and from -30C to +70C.

The sensor is stable with +/-1 per cent RH drift a year, ensuring reliable results over a long period of time, according to Michell.

To facilitate maintenance, the PF211 uses the I7000 Hygrosmart interchangeable module.

The sensor head incorporates all the calibration data; to ensure continued reliability over time, the user can replace the old sensor with a new one.

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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