Overview | 1-1
3050SLR MOISTURE ANALYZER
Overview
The 3050 Moisture Analyzer is a smart sensor that measures trace concentrations of mois-
ture in a process gas stream. At the heart of the 3050-SLR Analyzer is a 3050-OLV, which
has been modiied for operation at moisture concentrations below 100 ppbv. The 3050 is
compatible with He, Ar, Ne, Xe, Kr, O
2
, H
2
, N
2
, NO, CO, CO
2
, light hydrocarbons, natural gas,
refrigerants, air, and specialty gases. Refer to Table 1.1 for gas list. The analyzer is calibrat-
ed to measure moisture contents from 1 to 100 ppmv. Data output can be in units of ppmv,
ppmw, lb/mmscf, dewpoint °F or C° (requires process pressure value input), and mg/Nm
3
.
The heart of the 3050 is a quartz crystal microbalance (QCM) sensor that is sensitive to
moisture. The QCM moisture sensor is simply a quartz crystal oscillator, in which the quartz
crystal has been coated with a proprietary hygroscopic coating. This coating selectively,
and reversibly, absorbs moisture from a sample gas stream. As the crystal is exposed to a
gas stream containing water vapor, the hygroscopic coating absorbs moisture from the gas
stream, changing the mass of the coating. Changes in the mass are detected as changes in
the natural resonance frequency of the oscillator.
In the analyzers normal operating mode, the QCM sensor is alternately exposed to the
Figure 1-1.
3050 Analyzer
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