DH Instruments ADCS-601, Operation And Maintenance Manual

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ADCS-601™ OPERATION AND MAINTENANCE MANUAL
© 2005 DH Instruments, Inc. Page 106
ADCS-601 is a sophisticated automated pressure standard with advanced on-board features and
functions. Before assuming that unexpected behavior is caused by a system defect or breakdown, use
this manual and other training facilities to become thoroughly familiar with ADCS-601 operation. For
rapid assistance in specific situations, see Section 8, Troubleshooting.
ADCS-601 is covered by a limited 1 year warranty (see Section 9.3). Unauthorized service or repair
during the warranty period is undertaken at the owner's risk and may cause damage that is NOT
covered under product warranty and/or may void the product warranty.
6.2 FPG8601, CHECK BUBBLER AND ADD WATER IF
NECESSARY
It is critical to never tilt the FPG8601 when there is pressure in the system. If this occurs, water from
the bubbler will be forced through the lubrication gas lines and into the lubricating volume. This can
cause permanent damage to essential parts of the FPG.
For the FPG8601’s load cell to operate properly, it must be surrounded by gas with the appropriate level
of humidity (40 to 70% RH). To assure the appropriate level of humidity, the FPG lubrication gas passes
through a water filled bubbler and then a pressure reduction before it enters the load cell enclosure.
The bubbler’s water supply is consumed over time so the bubbler water level must be checked
occasionally and refilled if necessary.
To check the bubbler level proceed as follows:
Go to the back of the ADCS-601 Reference Bench to observe the back of the FPG8601 Platform (see
Figure 45).
Observe the water level in the bubbler (clear plastic reservoir on the right side looking at the
FPG8601 from the rear). The water level should be well over the bottom of the black gas delivery
tube so that the gas coming though the tube bubbles through the water.
If the water level in the bubbler is low, refill the bubbler (see procedure immediately below).
Figure 45. FPG8601 bubbler and filter
In Figure 45, the coalescing filter is on the left and the bubbler is on the right. This view is looking at
the back of the FPG8601.