Measurement Specialties 9116 - Manual (Page 124)

Pressure Systems, Inc. Model 9116 User’s Manual
Page 115 www.PressureSystems.com
5.1.6.4 Calibration Manifold Piston O-Ring Replacement
Following is a step-by-step procedure to replace Calibration Manifold O-rings in a Model 9116
Intelligent Pressure Scanner. There are eight (8) pistons, each with an O-ring, inside the
calibration valve housing; one (1) on each end of the housing, and three (3) on each side of the
calibration valve itself.
(1) Disassemble the module as described in Section 5.1.2.
(2) Remove the PC-327 Analog board as described in Section 5.1.3.1. Lay the circuit board
aside on an anti-static surface.
(3) Remove the tubing plate as described in Section 5.1.6.3.
(4) Using your index finger, shift the calibration manifold back and forth several times to loosen
its connection with the adapter plate O-rings. Carefully lift the calibration valve housing with
one hand and turn it over, letting the calibration manifold fall into the free hand. It is
imperative that the calibration manifold does not fall on a hard surface since scratches on
the manifold can result in pneumatic leaks.
(5) To remove the six (6) pistons from their slots on the manifold valve, hold the valve in one
hand and apply air pressure of approximately 30 psi (200 kPa) to the C3/C4 input passages
on the valve. The passages (0.043" diameter holes) are located on the side of the valve
next to the tubing plate, one hole on each side of the valve. Pressure on one side will
release three (3) pistons, and pressure on the other side will release the other three (3). If
the pistons stick, apply a slightly higher pressure. Place your free hand over the calibration
valve housing to prevent the pistons from coming out of the housing. Thoroughly clean the
pistons with a fast evaporating cleaning fluid that leaves little or no residue (e.g., acetone,
alcohol, Freon
® , etc.) and dry with supply air. Replace the piston O-rings after lightly
lubricating the rings with Krytox ® fluorinated grease. Replace the pistons in their cavity by
placing the O-ring side of the piston in first and then pressing the piston completely into its
cavity with one finger.
(6) To remove the two (2) C1/C2 pistons from their slots on either end of the manifold valve
housing, hold the manifold valve housing in one hand, and apply approximately 30 psi (200
kPa) to the two bulge tubes, one on either end of the housing end-plate. This will result in
the pistons being forced out of their cavity. If the pistons stick, apply a higher pressure.
Place your free hand over the calibration valve housing to prevent the pistons from coming
out of the housing. Clean the pistons, lubricate and replace the O-rings, and replace the
pistons into their cavities as described in (5) above.
(7) Thoroughly clean the calibration manifold with a fast-evaporating cleaning fluid that leaves
little or no residue (e.g., alcohol, acetone, Freon ® , etc.). Replace the calibration manifold
into the housing, making sure that the guiding pin fits into the slot of the manifold housing.
(8) Replace the tubing plate as described in Section 5.1.6.3.
(9) Replace the PC-327 Analog board as described in Section 5.1.3.1 and reassemble the
module.
(10) Test your scanner to ensure proper operation.