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Theory of Operation Teledyne API - Model 200EH/EM Operation Manual
204
Figure 10-10-13: M200EH/EM 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 M200EH/EM 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.
04521C (DCN5731)