PN 305200901, Rev YT
Verication
The 3050-OLV has a built-in Moisture Generator for onboard Verication. A
portion of the dry Reference gas ows through the Moisture Generator where
a known amount of moisture is added. When Cell Verication is initiated, the
QCM sensor is alternately exposed to gas from the Moisture Generator and dry
Reference gas. The moisture value is compared to a stored value. The sensor
can make an adjustment if the value is within a tolerance band. If the value is
outside the tolerance band, an alarm will activate.
Since the Moisture Generator uses a dried portion of Sample gas, sensor
Verication is preformed on a sample of the process gas. This yields the most
realistic test of the sensors performance under process conditions.
Gas Flow
The 3050-OLV Moisture Analyzer requires 150, ±20 SCCM sample volume to
operate. The ow is split between Sample, Reference, and Moisture Generator
sections of the sample system. The ow through the sample cell is maintained
at 50 SCCM with the remaining gas vented to exhaust. There is a bypass valve
in the analyzer that vents the inlet to exhaust through a ow restrictor. Activa-
tion of the bypass will increase total ow by approximately 1 SLPM. Note that
the bypass valve will improve system response time.
Internal Timing
The analyzer operates in two timing modes. The Normal mode consists of
short intervals of Sample and Reference gas. The Sensor Saver mode reduces
the exposure of the sensor to the Sample gas by increasing the time spent on
the dry Reference.
If the analyzer detects abnormal degradation of sensor performance over time
in the Normal mode, the analyzer will automatically switch to Sensor Saver
mode. Once the analyzer switches to Sensor Saver mode, it will not switch
back on its own.
The Sensor Saver mode extends the life of the sensor, but provides slower re-
sponse time. The analyzer updates every 2.5 minutes instead of one (1) minute.
1-4 | 3050-OLV Moisture Analyzer
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