PAL-AT Operating Manual
13
ENTER * TO CHANGE, # TO ACCEPT
REFERENCE READING ON CABLE ? IN PROGRESS
LCD2.1-13:
Normally, MED is selected when monitoring for water-based liquids and HI is selected for hydrocarbons to
meet or exceed the sensitivity values published on the “Product Data Sheet for PAL-AT Sensor Cable
Options”. A higher sensitivity makes a cable more sensitive and requires less wet cable to activate an
alarm.
The risk of damage to the environment and equipment in the monitored area should be
considered before selecting a lower sensitivity.
Changing from high to medium sensitivity approximately doubles the amount of wet cable needed for an
alarm. Changing from medium to low sensitivity doubles the amount again. Low sensitivity should not be
used with AGT-Gold sensing cable. The ADJ, or adjustable, setting is reserved for special cases and
should only be used after consulting with PermAlert technicians (see section 5.3.4).
Enter # to accept the recommended setting or enter * until the preferred setting is displayed and then enter
#.
This completes the Setup function. Next, PAL-AT automatically creates a master map and monitors the
cable.
2.2 Reference Maps
After a cable is setup, PAL-AT automatically creates a reference, or "master", map. A master map is an
electronic "snapshot" of the condition of the cable stored in memory. PAL-AT detects any change in the
condition of the cable compared to the master map. PAL-AT has memory space for seven (7) maps for
each cable. If PAL-AT detects a leak or drying on a sensor string, it automatically creates a new master
map so it can continue to monitor the entire system during the current leak.
2.2.1 Reference Process
PAL-AT displays the following message during the reference process. For most cables, this takes less
than 20 seconds. Then, PAL-AT automatically performs the verify function and monitors the cable.
LCD2.2-01:
2.2.2 Reference Map Rules
When a new cable is setup, PAL-AT always creates map 1. When a leak (or probe activation) is detected,
it creates map 2. If any additional leaks close to the first leak are detected (the leak getting larger), PAL-
AT overwrites map 2 with a new map 2. If it detects a new leak more than 20 ft from the first leak, PAL-
AT creates map 3. Each time an additional leak in the new area is detected, a new map 3 is taken. This
process continues as needed up to map 7. If map 7 is used, it is overwritten when a new reference map
is taken.
Drying cables (or probe reset) do not cause audible alarms. When a cable dries after a leak, PAL-AT
checks if the cable matches the original map 1 or other lower number map. If it does, the lower number
map becomes the active map that PAL-AT uses. If not, PAL-AT creates a new map, or “drying map”, using
the next higher map number. For example, a system detects a leak, creates map 2 and then the cable
slowly dries. PAL-AT creates a new map 3 each time the cable dries a little. Finally, when the cable is
completely dry, PAL-AT switches to monitor map 1.
When PAL-T detects a drying cable and it is using map 1, a new map 1 is created. This is typical after a
new installation with minor wet cable is dried.
Sometimes the cable does not match the original map 1 after a leak and drying sequence if the liquid in
the cable does not evaporate completely. This does not create a problem and PAL-AT monitors the cable,
regardless of the map number. However, the sensitivity may be reduced in the contaminated section of
the cable.
To Next Page
Loading...
Need help?
General
