DH Instruments ADCS-601 - FPG8601 Piston-Cylinder Maintenance

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6. GENERAL MAINTENANCE AND ADJUSTMENTS

To refill the FPG8601 bubbler proceed as follows:

Prepare the ADCS 601 system for access to the bubbler:

Set gauge measurement mode using the [MODE] button on the ADCS Run Screen Toolbar (see

Section 4.3.5.3). Wait for the process to complete.

Shut down the FPG8601 system by pressing the

[OFF] button on the ADCS Tools FPG Run Screen

(see Section 4.3.6.2). Wait until the shut down procedure is complete (FPG Pressure is < ---

SHUTDOWN --- > and indicates Ready, see Section 4.1.1).

Drain the coalescing filter by placing an absorbent wipe under the filter, then pressing the button on

the bottom of the filter.

Remove the bubbler by turning the plastic volume counter-clockwise.

Fill the bubbler to about 30 % of its capacity with clean distilled water.

Reinstall the bubbler. Tighten the plastic volume 1/4 turn clockwise until it feels snug against the O-ring.

Verify that the FPG is level using the bubble level on the top of the platform.

Restart the FPG8601 by pressing the [ON] button on the FPG Run Screen (see Section 4.3.6.2).

Wait until the FPG8601 start up procedure is complete.

ADCS-601 should now be ready to resume normal operation.

6.3 FPG8601, REMOVE CLEAN AND REINSTALL THE PISTON-

CYLINDER

6.3.1 OVERVIEW

Read this section completely before electing to remove, clean and reinstall the FPG8601

piston-cylinder assembly. Consider restoring piston-cylinder mobility procedures (see

Section 6.3.7) before undertaking piston-cylinder cleaning. In normal operation, the

FPG8601 piston-cylinder should operate reliably for many months or indefinitely without

the piston-cylinder needing to be cleaned.

The FPG8601 piston-cylinder may have to be removed, cleaned, and reinstalled into the

FPG8601. In normal operation, the FPG8601 piston-cylinder will operate for many months or

indefinitely without needing to be cleaned. There is no scheduled piston-cylinder cleaning

interval, cleaning should only be undertaking when necessary.

Maintenance cleaning may be necessary if the FPG8601 has been back pressured or if the

piston is not supplied with lubricating gas pressure for extended periods. Back pressuring

occurs when the pressure in the piston-cylinder mounting post exceeds the pressure in the

lubricating volume. The most common symptom of a dirty piston is noisy readings when the

system is properly lubricated with gas pressure and at zero pressure. See Section

6.3 for

procedures to remove, clean and reinstall the piston-cylinder.