Teledyne 200AH 用户手册

 

The PermaPure drier is constructed of 2 concentric tubes. The inner tube is a special material 
that has an affinity for water vapor. The outer annulus is evacuated by the instrument pump. This 
creates a concentration gradient causing water in ambient air to diffuse into the outer annulus, 
thus the air in the inner tube becomes progressively drier as it progresses down the tube.  

Due to the large number of connections and fittings on the drier, the most common drier fault is 
leaks. Before proceeding with any other procedures check the drier for leaks. 

Occasionally the drier gets contaminated. The manufacturer of the drier recommends replacing 
the drier rather than trying to clean it. If cleaning is chosen, the following options are available: 

1.  Dirt - Clean any solids from dryer inlet by brushing. Use clean dry air to blow any loose 

particles from the inlet. De-ionized water or dilute (5-10% conc HCl in de-ionized water) 
hydrochloric acid can be passed thru the dryer. This should be done only with the dryer and 
HCl at room temperature. 

2.  Contamination with organic liquids and Freons - rinse the inner and outer tubes using 1,1,1 

trichlorethane. Follow the solvent with dry air to purge the solvent. 

3.  Inorganic salts and oxgenated hydrocarbons can be removed by rinsing with 10% nitric acid 

at 50

C.