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Gas Flow
Sample System
The 3050-AMS Moisture Analyzer sample system enables the analyzer to make
reliable water vapor measurements at concentrations down to 0.035 PPMV. The
sample system serves several purposes:
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PN 305804902, Rev A
It controls the sample conditions at the Sensor assembly (e.g., flow rate,
temperature, pressure). Hence, the QCM-based Sensor is isolated from
variations in the ambient conditions that would otherwise alter the re-
sponse characteristics of the Sensor.
The sample system is designed to continuously switch the Sensor assem-
bly between the Sample gas and a dry Reference gas. This sample switch-
ing scheme yields both higher sensitivity and reduced drift in the Sensor
readings.
The sample system's design provides a means of challenging the analyzer
with a known source of dry gas to validate the baseline readings and to
compensate for any minor changes in background offsets. As such, the
3050-AMS is designed to deliver reliable, long-term performance from the
QCM-based Sensor.
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Overview
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