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Pressure Systems, Inc. 98RK-1 & 9816 User’s Manual©
Page 125 www.PressureSystems.com
5.1.6.2 Tubing Plate O-Ring Replacement
The following is a step-by-step procedure to replace a Tubing Plate O-ring in a Model 9816
Intelligent Pressure Scanner.
(1) Disassemble the module as described in Section 5.1.2.
(2) Place the scanner with the tubing plate on a clean, lint free surface.
(3) Hold the top plate/calibration valve assembly with one hand, supporting the bottom
assembly to prevent dropping when all screws are removed. Remove the six (6) Allen-
head screws on the top plate that secure the valve assembly to the top plate.
(4) Carefully rotate or slide the tubing plate back and forth, pivoting on the guiding pin about
1/8" several times. This is done to loosen the O-rings from the calibration manifold. Lift
the tubing plate straight up. Do not touch the calibration manifold.
(5) Remove and replace the O-rings needing maintenance, using the procedure described in
Section 5.1.6.1. Note that the O-ring seals use an additional Teflon cup seal (PSI part
number 24-00-50-153) placed on top of the O-ring. These seals should be replaced as
necessary. Note that these Teflon seals do not require the use of Krytox
®
grease. Notice
also the larger O-rings (PSI part number 61-14-50176 [C3/C4] and 61-14-70101 [Purge]).
Replace them in the same manner as described in Section 5.1.6.1.
(6) Examine the tubing plate and calibration manifold to verify that no contaminants are on
either surface. This generally requires microscopic examination. Replace the tubing plate
by slowly placing the plate on the calibration manifold housing. Make sure that the O-ring
side is down toward the pneumatic sliding manifold and the guiding pin on the calibration
valve housing fits into the mating hole of the tubing plate.
(7) Replace the six (6) Allen-head screws that pass through the top plate to secure the
calibration valve assembly. Tighten evenly, making sure that the screws are only finger
tight plus 1/8 turn. It is important not to over tighten the screws since the pneumatic seal
is made using dynamic O-rings.
(8) Reassemble the module.
(9) Test your scanner to ensure proper operation.