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Michell’s MDM300 portable dew-point hygrometer is designed to take high-speed measurements of moisture in compressed-air systems for surgical instruments and breathing air in spot checks to ensure safety in hospitals.

According to the company, compressed air is used throughout hospitals for breathing air and instrument air. As with all compressed-air systems, keeping moisture levels low is important to avoid corrosion, as well as reducing the risk of bacteria growing.

To remove the risk of bacterial growth, it is important to keep the compressed air at a dew point of less than -46°C. The MDM300 is claimed to provide peace of mind that the moisture level in the compressed air is at or below this dew-point temperature by enabling spot checks to be made at critical points in the system.

Each MDM300 hygrometer undergoes a 13-point calibration over 10 days before leaving the factory. The calibration certificates are traceable to the National Physical Laboratory (NPL) for the UK or the National Institute of Standards and Technology (NIST) for the US. Accredited calibrations to ISO 17025 are also available.

Key features and benefits

  • The MDM300 is capable of taking measurements on breathing air or surgical air at line pressure with a simple sampling kit — the Medical Air kit — which enables direct connection to the bulkhead system with a standard 3/8in NGS probe.
  • As the MDM300 needs no waiting time between measurements — even to very low dew points — a large number of spot checks can be carried out each day.
  • The instrument is said to be easy to use, with an intuitive interface that needs minimum training to use.
  • The MDM300 gives ±1°C accuracy down to -60°C dew point, giving increased confidence in the safety of the compressed air.

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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