Humboldt H-3630A Water Retention Apparatus User Manual
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Adjustment Procedure:
IMPORTANT: Turn the vacuum regulator adjustment knob clockwise until it is fully
closed, then apply sufficient vacuum from your source pump to conduct a test. The
regulator can withstand full vacuum, but the output must always be below the dial
gage safe limit of 85mm Hg max, To adjust the vacuum to 51mm close the glass
stopcock above the flask and back out the regulator adjustment knob by turning it
counterclockwise and observing the dial gage. When you have reached the 51 mm
band on the gage proceed to use the gasket seal, perforated dish and the correct
wetted filter paper, and then open the stopcock valve applying vacuum to the funnel.
Check for leaks by observing gasket and tubing seals and using a leak testing fluid if
necessary. An adjustment in the regulator setting may done at this time to achieve
the 51mm level under full flow conditions.
Maintenance
Sealing connections and surfaces should not allow foreign material to enter the gage,
regulator or pump. Pipe joint compound is recommended in place of Teflon tape.
To facilitate easy re-assembly apply a light film of fluid compound to joints and fittings.