Pressure Systems 98RK-1 Module Rear Manifold O-Ring Replacement, For glued O-ring replacement

Pressure Systems, Inc. 98RK-1 & 9816 User’s Manual©

5.1.6.6Module Rear Manifold O-Ring Replacement

If a leak is suspected at the module rear manifold:

(1)Remove the module from the 98RK-1 Scanner Interface Rack by unscrewing the locking rod (turn counterclockwise with a 5/64" Allen-head screwdriver) and slide the entire module chassis out of the rack (as previously described in Section 5.1.2).

(2)Inspect the rear manifold O-rings and if any are suspect, carefully remove with tweezers. (Do not scratch the manifold block, as this may induce additional leaks.)

(3)Clean the O-ring cup with a lint-free applicator moistened with a cleaning fluid such as acetone, alcohol, Freon, or any other substance that evaporates quickly and leaves very little residue. Remove any excess cleaner with supply air (dry) as soon as possible. Do not blow air directly into the holes of the surface since that could drive the fluid into the scanner.

For glued O-ring replacement

(4a) There are only two O-rings on this panel that are glued, the larger black ones. One is for the purge port and the other surrounds a blanking pin. Using a glue syringe, line the O- ring cup(s) with appropriate glue, such as 3M Scotch Grip 1357. Insert a new O-ring (PSI part number 61-03-50120) and press it into the cup with your hand. Allow the glue to dry for approximately 10-15 minutes. Clean any excess glue with appropriate cleaning solvent, and dry. Be extremely careful not to allow any excess glue to cover the tubing ports.

For non-glued (flared post) O-ring replacement

(4b) With clean hands, apply a small amount of Krytox® fluorinated grease to the palm of one hand and rub it out evenly with your index finger. Place one of the new (red) O-rings onto your greased palm. Work the O-ring around until it is evenly greased. There should be no white area of excess grease on the O-ring. Make sure there is only a thin film of lubrication on the O-ring. Using your greased finger, roll the greased O-ring over the flared portion of the tubing connector and into the O-ring cup. Ensure that no grease enters the hole that leads into a transducer.

For all

(5)Apply a very small amount of Krytox® fluorinated grease to the entire manifold, being careful not to allow any excess grease into any tubing port.

(6)Slide the module back into the 98RK-1 Scanner Interface Rack and screw the locking rod clockwise (using a 5/64" Allen-head screwdriver) until tight.

(7)Test the scanner to ensure proper operation.

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