This consistency is achieved via a self-calibration system which adjusts the analyser against an internal moisture generator. Long term stability of these measurement corrections is guaranteed, as the moisture generator is supplied with a calibration traceable to NPL and NIST.
Maintaining the system is simple, infrequent and inexpensive. No service at all is required for 2 years, at which point the desiccant dryer must be replaced – a process that can be carried out by the user in less than 10 minutes. The internal moisture generator can be replaced simply in the field with a freshly calibrated unit from the factory after 3 years of operation.
The long maintenance intervals of the product, in combination with the competitively priced spares means that the cost of owning a QMA401 over five years is less than half the cost of owning the leading competing product.
- The QMA401 is easy to use with an intuitive touch screen interface for monitoring, logging and configuring parameters.
- Both real-time trend graphs and alarm indicators are immediately visible in colour on the main display.
- The instrument is supplied with both analogue outputs, and USB and Ethernet digital connectivity, so that the device can be monitored and controlled remotely via a network.
Typical applications for the QMA401 are those which require trace moisture measurements in gases with high accuracy and fast response – such as verifying the purity of semiconductor plasma etching gases, monitoring polymer drying for plastic bottle manufacture and monitoring hydrogen cooling systems for power generators.