4-6 Model 3772/3771 Condensation Particle Counter
Data Logging (3772 only)
Data can be saved on a Flash memory card on the 3772. By default Data
Logging is “OFF.” To initiate data logging, switch the Data Logging user
setting to “ON” by pressing the left or right arrow once. Logging
will begin immediately. Press the arrow again to toggle Data Logging to
“OFF” to stop. More information on data logging is provided under “Using
the Flash Memory Card.” Use the Data Averaging option in User Settings
to set the data averaging interval for data collection.
Water Removal
The Water Removal option provides ON/OFF control for the water removal
feature of the CPC. The default setting is “OFF.” On the 3772 it can be set
from the Water Removal option in the submenu of User Settings. Pressing
the left
or right arrow toggles Water Removal system on or off. On
either 3772 or 3771 CPC, it can be turned on using the “SAWR” firmware
command. See Chapter 7 and Appendix B for information on firmware
commands.
Water Removal system is used in hot/humid environments to eliminate
contamination of the butanol working fluid by condensed water vapor.
Water removal keeps the CPC operating at peak performance.
Water removal is achieved by collecting all condensate from the cooled
condenser before it has a chance to return and remix with the butanol in
the heated saturator. The collected condensate is pumped to the Drain port
and flows into the supplied Drain Bottle.
The Drain Bottle must be connected for the water removal system to work
properly.
The water removal feature removes condensed
butanol as well as water, increasing butanol
consumption. The operator may elect not to use
water removal in cool/dry environments to preserve
butanol. When water removal is not used, butanol is
recycled. A full bottle of butanol (1 liter) lasts
approximately 7 days with the water removal system
ON and last 15 days with the water removal system
OFF.
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