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Gas Flow
Sample System
The 5920 Moisture Analyzer sample system enables the analyzer to make reli-
able water vapor measurements at concentrations down to 1 PPBV. It serves
several purposes.
1. It controls the sample conditions at the sensor assembly (e.g., flow rate,
2. The sample system is designed to continuously switch the sensor assembly
3. The 5920 sample system is designed with a means of challenging the ana-
PN 592047901 Rev YC
temperature, pressure). This enables the 5920 Analyzer to isolate the QCM-
based sensor from variances in the ambient conditions that would other-
wise alter the response characteristics of the sensor.
between monitoring the sample gas and a dry Reference gas. This sample
switching scheme yields both higher sensitivity and reduced drift in the
sensor readings.
lyzer with a known source of dry gas to both validate the baseline readings
and to compensate for any minor changes in background offsets. As such,
the 5920 is designed to deliver reliable long-term performance from the
QCM-based sensor.
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Overview
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