Initial Setup Of The Console Using Workflow Wizard Setup>Tank>Limits - Concluded
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Setup>Tank>Limits - Concluded
Water Alarm Filter Level
During the delivery process, turbulence may be generated in the tanks that
may cause the water float to rise above the water alarm thresholds and trig-
ger false water alarms. In addition, a delivery of fuel containing water and/
or surface water flooding the area and entering the tank through a riser or
other opening may result in significant quantities of water entering the
underground tanks.The Water Alarm Filter Level feature increases the sys-
tem’s ability to respond to all of these situations. This field provides three
choices of filtering:
Low - This is the quickest response to either flooding or water delivery sce-
narios and is the default choice. The water alarm will be reported 3 minutes
after the water level has crossed the programmed threshold. A delivery may
be in progress during this alarm.
Medium - This level disables the water/alarm monitor during a delivery.
The delivery detection threshold will be set to 25 GPM. This will be small
enough to detect most deliveries and large enough to not mistakenly identify
a delivery when water is leaking into a tank during a flooding situation. This
filter will only be applied to the water alarm.
High - The level follows the same behavior as the medium level filter. The
delivery activity detection rate is raised to 6 GPM; (roughly equivalent to the
current delivery detection rate). The maximum Wait Time will be increased
to 45 Minutes and the Maximum Height Value will be increased to 10 inches.
NOTE: Adjustments to the delivery fill tube may eliminate false water alarms
caused by delivery turbulence.
See Actions>Help>Understanding ATG>Water Alarm Filter Level for more
on this subject.
Leak Alarm Limit
[Applies to SLD tests only]
During a leak test, the leak alarm limit alerts you when the cumulative tem-
perature compensated (TC) product loss from a tank reaches the leak alarm
limit value and helps identify large losses of product during a leak test.
To prevent false reports and alarms from being triggered, do not set the limit
value to identify losses of 0.2 gph (0.76 lph) or less during the test period.
The leak alarm limit should be set to identify losses of 1 gph (4 lph) or
greater.
Consider both the leak rate you wish to identify, and the length of the test,
when determining a value for leak alarm limit. For example, a value of 8 gal-
lons (32 liters) will warn of:
• A 1 gph (4 lph) leak in 8 hours
• A 2 gph (8 lph) leak in 4 hours
NOTE: The console automatically interprets the limit you enter as a negative.
It is not necessary to enter the minus (-) sign.
Sudden Loss Limit
[Applies to SLD and Timed Sudden Loss Detection (TSLD) tests only]
This value allows the system to look for significant losses during a quiet
period to determine if the tank is leaking or fuel has left the tank (e.g., by
bypassing the dispenser meters). It is not based on TC Volume and is
intended to identify losses larger than the leak alarm limit. The default is 99
gallons (374.7 liters) but can be set to 1 to 999,999 gallons (3.78 to 3781.63
liters). Typically, you should set this limit to 25 gallons (100 liters) or higher.
If you are getting too many false alarms, consider increasing this limit.
Note: Siphoned-manifolded tanks are monitored as a single tank. The Sud-
den Loss Limit threshold is the sum of the thresholds for each member of the
manifolded set.
Density Low Limit
[Field only available if density probe is installed]
Triggers density warning (when greater than the value you enter here plus
1.00kg/m3 (0.062 lbs/ft3) and a density alarm.
Density High Limit
[Field only available if density probe is installed]
Triggers density warning (when greater than the value you enter here minus
1.00kg/m3 (0.062 lbs/ft3) and a density alarm.
Fuel Low Temperature Limit
The limit that triggers a low fuel temperature alarm. The default is -50
degrees Celsius (-58 degrees Fahrenheit). The alarm clears when the fuel in
the tank returns to a temperature that is two degrees Celsius (3.6 degrees
Fahrenheit) higher than this temperature.
Fuel High Temperature Limit
The limit that triggers a high fuel temperature alarm. The default is 60
degrees Celsius (140 degrees Fahrenheit). The alarm clears when the fuel in
the tank returns to a temperature that is two degrees Celsius (3.6 degrees
Fahrenheit) lower than this temperature.
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