On-Board® W Module Programming and Operation ... - PTB Sales

On-Board W Module Programming and Operation
CTI-CRYOGENICS
HELIX TECHNOLOGY CORPORATION
From page 3-22
ROUGH 125µ/50µ
Displays the current pressure (125µ) and the base pressure to be
achieved (50µ). The waterpump is roughed out until the base
pressure is reached.
REPURGE #1 2M
If the pressure does not reduce at a reasonable rate during the rough
out phase, the On-Board W Module will automatically repurge the
waterpump for the programmed REPURGE time. The display
indicates that this is the first purge cycle (#1) and that there are two
minutes (2M) remaining in this cycle.
The waterpump is roughed out again until the base pressure is reached.
The following events occur:
- Waterpump TC reaches programmed base pressure of 50µ
- Rough valve closes and the On-Board W Module waits 15 seconds
to stabilize
- On-Board W Module measures TC pressure and takes second reading
in 30 seconds
- On-Board W Module calculates ROR pressure increase in µ/minute
- If ROR is less than programmed value, the ROR test passes
- If ROR is more than programmed value, the ROR test is repeated
ROR 3 124µ/10µ
The display indicates the number of ROR test cycles (3), current ROR
value (124µ/µ), and the programmed ROR value (10µ/µ).
If ROR test is repeated:
- Rough valve opens
- Waterpump is roughed out again to base pressure
- ROR test is repeated
Continued on page 3-24
Figure 3-23: On-Board Appendage Waterpump
REGEN Cycle Program Example (continued)
P/N 8040365 3-23