53
123919 Rev C 5-17-18
How to set the Process Set Points
Menu Code 85
Automatic Vent Down Set Point
- - This set point defines the tank pressure that halts the automatic vent
down process. If the tank pressure is above this set point, the vent valve is opened. If the tank pressure is
below this set point, the vent valve is closed.
Automatic Vent Down Hysteresis
– This timer defines the amount of time the vent valve remains open
after the vent valve is opened during the automatic vent down process. Once the vent valve is opened,
the sensed pressure can be significantly different from the tank pressure due to the location of the
pressure transducer. The vent valve remains open for the time defined by this timer. Once the timer
expires, the vent valve is closed, and the tank pressure is tested again.
To set the set points in mode 85, follow this procedure:
Continued from Page 50.
7. Now the Automatic Vent Down limit is displayed (see
figure 85.4).
8. The vent close pressure may be set from 0 to 160psi.
Use the manager’s keypad to enter the correct limit,
press
ENTER
to save.
9. Now the Vent Close Hysteresis limit is displayed (see
figure 85.5).
10. The Vent Close Hysteresis value may be set from 10
to 99 seconds. Use the manager’s keypad to enter
the correct limit, press
ENTER
to save.
11. Press
Cancel
to exit this menu Mode.
NOTE: The vent valve will remain open while pressure
is above the limit entered for Automatic Vent Down.
Once pressures are below the limit set for Automatic
Vent Down the vent valve will close.
NOTE: The vent valve will remain open for the length
of time set for the Automatic Vent Down Hysteresis
limit, before it will close to check tank pressure.
Auto pr
xxx
Figure 85.4
COdE
85
How to Program the Dispenser for Operation
Auto hys
xx
Figure 85.5
COdE
85
Summary of Contents for Natural Gas Series
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