MDM 50 Hygrometer

MDM 50 is a compact and easy to use portable hygrometer with fast response, integrated sampling system and traceability to National Standards. The Hygrometer has been designed to make high-speed spot checks of the dew point in air and gases to -50°C dew point as simple as possible. 

This completely self-contained instrument weighs only 4kg and is delivered ready to use. Simply connect your sample gas to the Quick Connect fittings, turn on the instrument, and it will automatically begin to measure the dew point of the applied sample. 

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  • Measurement range: –50 to +20°C dew-point  
  • Accuracy: ±2°C dew-point
  • Run time: 12 to 16 hours 
  • Charge time: 16 hours for maximum charge
  • Flow rate: 1 to 5 Nl/min
  • Operating temperature: –20 to +50°C
  • Output: 4–20 mA current maximum load resistance 400 Ω
  • Compressed air dryers
  • Medical gases
  • Plastic molding dryers
  • Instrument Air
  • Ozone generators

MDM 50 is based on Polymer Sensor technology.

A capacitive humidity sensor works like a plate capacitor. The lower electrode is deposited on a ceramic substrate. A thin polymer hygroscopic layer acts as the dielectric, and on top of this is the upper plate, which acts as the second electrode but which also allows water vapor to pass through it, into the polymer.

The dielectric strength of the polymer is proportional to the water vapor content. In turn the dielectric strength affects the capacitance, which is measured and processed to give a relative humidity measurement. By combining this figure with a measurement of temperature, a dew point or absolute humidity value can be calculated. 

Advantages of Polymer 

  • Very fast response 
  • Long-term stability 
  • Resistant to most chemicals 
  • Not permanently damaged by liquids
  • Insensitive to contamination by particles