Moisture tracer - MM400

Analyzers of series MM400 have been designed to determine the moisture level in gases. The MM400 offers ease in use and an excellent cost/performance ratio. The MM400 works with a high quality aluminium oxide moisture sensor. It offers reliable  results from -100°C…+20°C dewpoint.

The measuring cell of these moisture analyzers has a permeable layer of aluminium oxide  on a conductive substrate and a thin coating of gold. the aluminium core changes the electrical capacity to the gold layer proportionally to the humidity of the sample gas.  If the sensor is exposed to the moisture, water molecules get rhough the electrode to the surface ofth oxide and form bridge bonds there The resistance value and the polarisation capability change as a result of the oxide being enriched with moisture as a result of the absorption.

Spurenfeuchte Analysator Taupunktmessung Gas MM400

Information onthe dewpoint measuring device MM400

The MM400 moisture analyzers offer the following measuring data:

  • Response time (humid to dry): <1min_ from -20°C…-60°C
  • Response time (dry to humid): <1min_ from -100°C… -20°C
  • Measurement inaccuracy: 1% of +20°C…-60°C,
    2% of -60°C…-100°C

As standard the MM400 is available as bench mounted version, as field verson or as 19″ rack version. The casings can be modified with expansions or cutouts just to customer’s demand. For special applications the sensoric can be used as transmitter (MT27 Moisture Spy) without further electronics.

  • Bench-mounted version MM410: 190x137x410mm
  • External installation on mounting plate – MM411
  • Field version IP66 MM420: 460x380x160mm
  • 19″ rack version MM430: 178x484x410mm


The measurement area can be defined as moisture level or dewpoint.

  • Moisture content (volume): <0.1…>2000ppm
  • Dewpoint (Celsius: -100…20.0°C approx
  • Dewpoint (Fahrenheit): -148…68.0°F appox.

Numerous options are available for the casing, the electronics and the gas flow path:

  • External sensor
  • Pressure regulator
  • Measuring value alarms
  • Analogue output (0/4…20ma, 0…10V)
  • Flow alarm
  • Electrical options for EX areas
  • Autocalibration
  • Internal bypass
  • Mounting accessories
  • Stainless steel piping

Typical applications

  • Monitoring of the gas quality
  • Additive manufacturing
  • Analysis of gas storage and gas cylinders
  • EX areas
  • Semiconductor Industry
  • Research and Training
  • Gas manufacturing
  • Glove boxes
  • Inert gas systems
  • Ceramics
  • Semiconductor industry
  • Adhesive industry
  • Soldering equipment
  • Pharmaceutical industry
  • Polychemistry
  • Heat treatment
  • MAP packaging equipment
  • Reflow furnaces
  • Soldering equipment
  • Sintering plants

Benefits at a glance

  • Sensor with multipoint calibration
  • Large measuring range
  • Exchange sensor
  • Suitable for very dry gases
  • Very low cross sensitivity
  • Sensor insensitive against light pollution
  • Long sensor lifetime
  • Quick response time
  • Numerous options and extensions
  • Also for EX areas
  • Maintenance and calibration in Germany
  • Insensitive against vibrations and changes of position
  • Good readability
  • User-friendly


Dewpoint measurement: -100°C...+20°C

Various casings

Combinable with other measuring equipment

External installation
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