QMA 601

Process Moisture Analyzer

The QMA 601 Moisture Analyzer is designed to provide reliable, fast and accurate measurement of trace moisture content in a wide variety of process applications where keeping moisture levels as low as possible is of critical importance.

The new analyzer utilizes a new generation of precision crystal oscillators guaranteeing a highly accurate measurement which is completely insensitive to changes in background gas composition. While other moisture technologies are being stretched at sub-ppm trace moisture levels, the new QMA601 can offer reliability, simplicity and greatly reduced cost of ownership from trusted and proven Quartz Crystal technology.

Send Enquiry
  • Atex
  • Technical Specifications
  • Applications
  • Operating Principle
  • Literature
  • Other Models
  • Calibrated range: 0.1 to 700ppmV
  • Measurement range: 0.1 to 2000ppmV
  • Accuracy: ±10% of reading from 1 to 2000ppmV ±0.1ppmV between 0.1 & 1ppmV
  • Repeatability: ±5% of the reading from 1 to 2000ppmV ±0.1ppmV between 0.1 & 1ppmV
  • Limit of detection: 0.1ppmV
  • Operating environment:  Analyzer : +5 to +45°C up to 90% RH
    • Analyzer in sampling system:  –20 to +55°Cup to 95% RH 
  • Glycol dehydration of natural gas 
  • Molecular sieve dehydration of natural gas 
  • Natural Gas transmission and storage 
  • Refinery catalytic reforming — recycle gas monitoring 
  • Ethylene and propylene production 
  • LNG production / revaporization

The QMA601 Process Moisture Analyzer utilizes the Quartz Crystal Microbalance technology.

The Quartz Crystal Microbalance (QCM) technology for moisture measurement is based on monitoring the frequency modulation of a hygroscopic-coated quartz crystal with specific sensitivity to water vapor. Bulk adsorption of water vapor onto the coated crystal causes an increase in effective mass. This change in mass modifies the oscillation frequency in a very precise and repeatable manner and the frequency change is in direct proportion to the water vapor pressure.

The moisture concentration can therefore be measured as a change in the oscillation frequency, with respect to a reference crystal. The sorption process is fully reversible with no long-term drift effect, giving a highly reliable and repeatable measurement.