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Principles of Operation Teledyne API - Model T200H/T200M Operation Manual
284
very large and the dryer’s efficiency is low at first but improves as this cycle reduces the
moisture in the sample gas and settles at a minimum humidity.
Figure 8-11: T200H/M Perma Pure
®
Dryer
Just like on startup, if the instrument is turned on after having been off for more than 30
minutes, it takes a certain amount of time for the humidity gradient to become large
enough for the Perma Pure
®
Dryer to adequately dry the air. In this case, called a cold
start, the O
3
Generator is not turned on for 30 minutes. When rebooting the instrument
within less than 30 minutes of power-down, the generator is turned on immediately.
The Perma Pure
®
Dryer used in the T200H/M is capable of adequately drying ambient
air to a dew point of ≤ -5˚C (~4000 ppm residual H
2
O) at a flow rate of 1 standard liter
per minute (slpm) or down to ≤ -15˚C (~1600 ppm residual H
2
O) at 0.5 slpm. The
Perma Pure
®
Dryer is also capable of removing ammonia from the sample gas up to
concentrations of approximately 1 ppm.
07270B DCN6512