Gasboy Atlas Fuel Systems Installation Manual - Manual (Page 57)

MDE-4331M Atlas® Fuel Systems Installation Manual · September 2014 Page 6-27
Calibration Installation
Calibration Adjustment for Ultra-Hi Models
To adjust the calibration for Ultra-Hi models, proceed as follows:
1 Check the meter registration by delivering the product to a reliable, accurate, 50 or 100 gallon
(or metric equivalent) prover can.
Figure 6-10: Ultra-Hi Models
2 Convert the amount of error to gallons per 100 (provides a percent figure) or gallons per
thousand (provides one-tenths of a percent figure).
3 Read the setting indicated on the adjuster. The amount of error is added to or subtracted from
this setting. The adjuster is shown in graduated divisions of 1%, 0.1%, 0.02%.
4 Reset the adjuster by loosening the clamp.
To decrease the amount delivered, turn the thimble in, on the barrel.
To increase the amount delivered, turn the thimble out (unscrew it). After resetting the
adjuster, tighten the clamp.
Note: Always make the final adjustment by turning the thimble in. If the new setting is a
higher number than the original, turn it back beyond the required figure and come back
to it.
For example: Assume that the adjuster setting at the start of the test reads 2.05. The product is
run through the meter into a prover can until the counter registers 100 gallons.
Assume that the prover can shows a volume of 98.7 gallons (1.3 gallons short).
Since the adjuster graduations are in percent readings, this 1.3 can be added
directly to the adjuster reading (2.05 plus 1.3 equals 3.35 on the adjuster). A

rerun through the meter must then show 100 gallons both on the meter counter
and on the prover can.
If you are measuring in increments of less than 100 gallons, use this simple formula to
determine the percentage by which the adjuster must be adjusted:
(P - M) / M = A%
where P is the prover measurement, M is the meter reading, and A% is the percent adjustment
for the adjuster.