Pressure Systems 9022 Manual do Utilizador descarregar pdf (Página 148)

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Measurement Specialties, Inc. NetScanner System (9016, 9021, & 9022) User’s Manual

5 - 13

5.1.6 Replacement of O-Rings

MEAS calibration valves include static and dynamic O-ring seals. When used properly, the rated

durability of the dynamic O-rings is in excess of 1,000,000 shifts of the calibration valve.

The procedures described below should be used for replacement of all the O-rings in the Model

9016 Intelligent Pressure Scanner. Use the tools and follow the general warnings already

described at the start of Section 5.1.

The material needed for the O-ring replacement can be acquired through the proper maintenance

kit available from Measurement Specialties. Specifically needed for these procedures are

calibration manifold and piston O-rings, PTFE cup seals, a fast evaporating cleaning fluid ( i.e.

acetone, alcohol, Freon

, etc.), 50 psi dry air supply, and Krytox

fluorinated grease (read

product warnings and recommendations thoroughly). Service of O-ring seals requires a

clean working environment. Introduction of contaminants to the O-ring or internal calibration

manifold surfaces can result in internal pneumatic leaks. Inspection for contaminates generally

requires some type of magnification device, such as a microscope.

5.1.6.1 DH200 Pressure Transducer O-Ring Replacement

Please note that the DH200 O-rings are used for static seals only. They will typically not require

replacement unless exposed to improper liquid media (which will also damage other 9016

components). Following is a step-by-step procedure to replace a DH200 O-Ring should it be

required:

(1) Disassemble the module as described in Section 5.1.2.

(2) Remove the PC-206 Amplifier/Multiplexer board as described in Section 5.1.3.1. Lay

the circuit board aside on an anti-static surface.

(3) Remove the DH200 transducer(s) as described in Section 5.1.4. If more than one DH200

is removed, it is recommended to record their serial numbers prior to removal to ensure

they are reinstalled in the same locations.

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Pressure Systems 9022 Manual do Utilizador Página 148