Measurement Specialties 9116 user manual Tubing Plate O-Ring Replacement

Pressure Systems, Inc. Model 9116 User’s Manual

5.1.6.2Tubing Plate O-Ring Replacement

The following is a step-by-step procedure to replace Tubing Plate O-rings in a Model 9116 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)Inspect for the presence of shim washers around each of the six (6) screws. If washers are present, retain for use during reassembly.

(6)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 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.

(7)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. Make sure that the O-ring/cup seal 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. Also, ensure that shim washers, if used, are installed between the tubing plate and the calibration manifold assembly, in all six (6) locations.

(8)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.

(9)Reassemble the module.

(10)Test your scanner to ensure proper operation.

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