Franklin Fueling Systems Colibri CL6 Setup and Operators Guide - Manual (Page 29)

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To See If a Tank Is Autocal Ready
• Use the previous month’s DIM Reconciliation Report to
look for explanations for the Over / Short status. A typical
tank that needs calibration will show a consistently
high variance, but not very high. If the Daily Variance
is higher than 10% of the sales for that day, then the
problem is probably being caused by something that will
not be resolved by using Autocal.
• Check the Active Alarms and Alarm History for probe
problems on the tank to be calibrated.
• Check the tank setup. Each tank must have its own
Special Tank, and each tank type must be the Special
Tank of the same number (e.g. Tank 1 type = Special 1,
Tank 2 type = Special 2).
• Make sure that the Tank Length (or estimated Length
for fiberglass) is programmed correctly. If it is not, there
may be a false delivery recorded at the time between
the old tank chart being cleared and the first point being
put in. To see how to adjust the length of your tank
correctly, refer to the following section called Adjusting
Length first.
• Are there any known problems at the site in the past that
might effect variance?
• Record the daily usage from the ATG in order to
estimate how long Autocal will take to complete.
• If Autocal has been attempted before, make sure that it
was stopped and that the original tank information was
programmed back in prior to starting Autocal again.
If the above bulleted points have all been addressed, then
you are ready to start Autocal.
Calibration Procedure
FFS recommends that calibration be started with the
tank filled to more than 90% of its total volume, and that
the tank be then allowed to drain down to at least 10% of
its total volume. When the Autocal program senses 80%
volume coverage, it will end automatically, but it can also
be stopped manually at any time.
As long as the coverage is around 70%, it should be
sufficient. The key is that the new tank chart covers the
level range that the tank stays in during normal operation.
Delivery during Calibration
If a delivery occurs during the Autocal process that raises
the fuel level to a point above the calibration starting point,
Autocal will STOP.
Adjusting Length First
If the Tank Length (or estimated Length for fiberglass) isn’t
programmed correctly, then there may be a false delivery
recorded at the time between the old tank chart being
cleared and the first point being entered in. Make sure that
your Tank Length is programmed correctly, and refer to the
appropriate section below based on your tank type.
Flat Ends (Steel)
If the ends of the tank are flat so that the tank is a true
cylinder, then the ATG should only need to know the
length and diameter and should not need to be calibrated.
Adjusting the Length may correct the problem.
If the Daily Variance is always negative or always positive,
then it is likely that the Length is wrong. Check the delivery
accuracy, and it will likely show an error also, though
probably in the opposite direction of the variance.
If the Daily Variance is consistently NEGATIVE (with
positive deliveries), then the tank is TOO BIG and the
Length should be shortened and vice versa. Adjust the
Length of the tank. As a rule of thumb, calculate the
average variance for the past five days. Figure out what
percentage of the total tank volume this average variance
is equal to, and modify the length of the tank by the same
percentage. Monitor the Daily Variance of the modified
tank for several days to see what the effect has been.
Dome Ends (Fiberglass)
If the tank is fiberglass with domed ends, then there is no
set Length. An approximate Length should be calculated
based on the Diameter and Volume capacity of the tank by
using this formula: Length = 231 (4V/πD2) (for metric units
replace 231 with 10,000,000). Enter the Correction Points
from the manufacturer’s tank chart at least every 5 inches
(12.7 cm) - the more points entered the better.
Length and Volume Unknown
If the Length and Volume of the tank are unknown and you
don’t have a tank chart, then the default reference volume
will not be accurate enough. Follow these steps to obtain,
and enter, an accurate reference volume in the tank:
1. Enter an approximate length.
2. Drain the tank completely dry (the product drop in
the next step will be off by whatever amount is not
removed).
3. Drop an accurately measured amount of fuel into
the tank — the more measured fuel added, the
better.
4. Adjust the Length until the ATG reads about the
same amount as was dropped.
5. Enter the amount dropped as the reference
volume when prompted during the Autocal start.