Xylem XL Series H-522 - Plus - Manual (Page 232)

21-6 Operation with the H-355 "Smart Gas" System
XL™ Series
PC Interface View Built In Display Screen
Purge Threshold: 20 PSI (46.13 feet) Purge Thresh [XXX]PSI
The purge threshold is the amount of pressure required to cause the H-355 to automatically purge
the line. This must be set to a value above the highest water level possible. For example if a river
may reach 30 feet but not higher, this is the same as 13 PSI, in this case the purge threshold could
be set to 15 PSI, (or 34.6 feet). If the orifice line pressure reaches the purge threshold, indicating
a blocked line, the XL™ will initiate an auto purge. If the purge is successful, normal operation
will continue. If the purge fails, the H-355 will not try another purge until 24 hours later. The H-
355 enters this mode of operation to preserve the battery in case of a plugged orifice. The range
of "Purge Thresh" is 10 to 65 PSI.
PC Interface View Built In Display Screen
Manual Purge Manual Purge?
Using the PC menu, pressing the ‘M’ key or pressing when using the built in menu will
cause the H-355 to perform a purge immediately using the current purge settings. If the battery
voltage is approximately 11.25 volts or less, then the purge will not happen.
PC Interface View Built In Display Screen
N - Number of Purges: XXX Purged XXX Times
This is a status screen that indicates how many times the H-355 has purged. Pressing the
ENTER key will reset this value to zero when using the built in menu. When using the PC menu
press the ‘N’ key to reset the counter back to zero. This is useful to see that the unit has been
purging since the last visit.
PC Interface View Built In Display Screen
U - Update All values Not Available In Built In Menu
The status values on this screen are not updated automatically due to the time it takes to read the
values from the H-355 bubbler system. In order to update the status values using the PC menu
the ‘U’ key must be pressed. This will take a couple of seconds.
When using the built in menu, the user must exit this section of the menu and reenter the H-355
options to see the updated values.