Zefon GEMINI Operation Manual
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Chapter 2, Maintenance Operation Manual2-2 GEMINI Twin-Port Sampler1. Remove the Filter Disc from the Tube Holder by rolling theflange part of the Tube Holder down and away from the Disc.2. Gently tap or blow on the surface to remove any foreign matter.3. Replace the Disc, orienting it so the previously exposedsurface is once again facing away from the Sampler.ValvesThe needle valve stem of each valve can be occasionallyremoved for inspection of the needle and the needle seat.1. Turn the stem counterclockwise until it is free of the valve body.2. Clean the needle by wiping it with a soft tissue.3. If the valve seems to be clogged (i.e., you are unable toachieve 500 ml/min. flow at 3-1/2 to 4 turns open),remove the pressure plate and Tube Holders. Direct astream of compressed air through the open valve body tohelp dislodge any particulate matter causing the problem.4. Reinstall the needle.Performance TestAfter extended idleness and periodically during use, check theSampler for proper performance with the following test:1. Connect a water manometer or vacuum gauge to one ofthe Tube Holders.2. Open the associated needle valve 3 to 4 turns counterclockwise from fully closed.3. Connect a flowmeter to the other Tube Holder.4. Close (fully clockwise position) the associated needle valve. |
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