Process Analyzers
QMA401
Trace Moisture Analyzer
The next generation Advanced Quartz Crystal Microbalance analyzer from Michell Instruments
is designed to provide reliable, fast and accurate measurement of trace moisture content in a
variety of applications where keeping moisture to a minimum is of critical importance.
Highlights
• Precision measurement from 0.1 to 2000 ppm
• Simple, low cost, on-site maintenance
• Accuracy of 0.1ppmV or 10% of reading,
whichever is greater
• Reliable measurement even in varying sample
conditions — analyzer corrects automatically for
flow variations
• Unaffected by changes in background gas
composition
• Long intervals between maintenance
• Dryer can be replaced by the user in 10 minutes
• Intuitive user interface
• Ethernet or USB digital communications
• SD card datalogging
• Optional internal sample handling and bypass loop
www.michell.com
Applications
V
• High purity gas production
• Air separation plants
• Semiconductor CVD chamber cleaning
• Semiconductor etching chambers
coolant for generators
• H
2
• Polymer chip drying
Process Analyzers
Introducing the QMA401 Trace Moisture Analyzer
Air Separation Plant
Precision Measurement
The QMA401 is the result of Michell Instruments’ continuous
improvement of Quartz Crystal Microbalance technology.
The analyzer utilizes a new generation of precision
crystal oscillators, guaranteeing high accuracy moisture
measurements which are completely insensitive to changes
in background gas composition.
While measurements at quantities of moisture <1ppm
stretch the capabilities of other technologies, the new
QMA401 offers reliability, simplicity and greatly reduced
cost of ownership from the industry-proven Quartz Crystal
technology.
Reliability
For maximum stability, all critical components of the QMA401
— the moisture generator, sensor and flow control devices
— are precisely temperature controlled. This ensures that
fluctuations in sample gas or environmental temperature
have no influence on the measurement.
The analyzer utilizes a mass flow controller to ensure precise
control of the sample and reference gas flows to ±0.1ml/
min. Coupled with a pressure transducer, this system ensures
continued accuracy of measured and calculated parameters
even during fluctuations in sample pressure.
Simplicity
The QMA401 provides a highly intuitive, color, touch-screen
interface. This powerful UI makes control, logging and
configuration of analyzer parameters very simple. Both realtime trend graphing and alarm indication are immediately
visible on the main display.
Minimal & Straightforward
Maintenance
Sophisticated analyzers are often complicated and require
experience and special care in use and maintenance,
increasing cost of ownership.
The QMA401 differs through its straightforward approach to
field service, which can be carried out in-situ. The desiccant
V
dryer is easy to replace via the ‘quick release’ service panel
on the rear of the analyzer. The moisture generator has an
average life span of 3 years before replacement is required,
therefore the unit can perform reliably for many years with
just basic maintenance and housekeeping.
Integrated Sample Handling
The analyzer can be specified with an integral sample
handling system, including a pressure regulator and ‘fast
loop’ bypass, to ensure quick transit of the sample from the
point of interest to the sensor.
Use Your Preferred Communication
Media
For greater flexibility, the QMA401 offers:
• Modbus over USB and Ethernet
• Datalogging to SD card
• 2 user-configurable analog outputs
• Status and process alarms
Automatic Verifi cation
The QMA401 incorporates an automatic verification system
that uses either the internal traceable moisture generator or
an external reference supplied by the user. Carried out on the
sample gas flow, these periodic validation-checks of sensor
performance can be initiated on demand, or automatically
(at user-defined intervals and time of day), providing a
verification of analyzer performance and automatically
adjusting out any change. The moisture generator at the
core of the system is supplied with a calibration traceable to
NPL and NIST.
www.michell.com
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