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Gas Flow
Sample System
The 5830 Moisture Analyzer sample system enables the analyzer to make reliable
water vapor measurements at concentrations down to 20 PPBV. The Sample Sys-
tem serves several purposes:
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PN 583054901, Rev YA
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 5830 Sample System's design provides a means of challenging the an-
alyzer with a known source of dry gas to validate the baseline readings and
to compensate for any minor changes in background offsets. In addition,
the analyzer contains a permeation tube-based moisture standard that can
be used to challenge the analyzer with a known moisture concentration.
As such, the 5830 is designed to deliver reliable, long-term performance
from the QCM-based sensor.
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