Gasboy Atlas Start-up - Manual (Page 145)

MDE-4334D Atlas™ Start-up and Service Manual · July 2013 Page 6-25
Meter Calibration Hydraulic/Mechanical Components
Atlas (Gallon Unit of Measure)
All Atlas meters must be checked for calibration before placing them in service or on service
replacement. Air-purging of new units or serviced meters is required before calibration.
Causes of Known Calibration Problems
• Bad meter (worn piston cup, internal valve not seating, or calibrating wheel in wrong
location).
• Bad pulser.
• O-rings leaking on inner VaporVac vapor return hose.
• Leaking meter check valve (product is leaking back through another meter, causing other
meters to turn backwards).
• Internal leaks or thermal contractions, causing a void in the hose. W&M may take
readings that come up short in the morning when it is cooler, but will pass in the afternoon
after warming up. Use the Hose Pressurization option.
LC Meter Calibration Adjustment for Ultra-Hi Models 9850K and 9850KX
To adjust the calibration for Ultra-Hi Models 9850K and 9850KX, proceed as follows:
1 Check the meter accuracy by delivering the product to a reliable and accurate

50- or 100-gallon (or metric equivalent) Prover Can.
Figure 6-12: 9850K and 9850KX Models
3
4 5
6
0
2
4
1
3
VOLU M E %
LAR GER S M ALLER LIQ UID C ON TROLS C OR P
0. PERCENT
0.0 PERCENT
0.00 PERCENT
Tighten Screws After Adjusting
2 Convert the amount of error to gallons per hundred (which gives a whole percent figure) or
gallons per thousand (which gives one-tenths of a percent figure).
3 Read and note 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 after first 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.
5 Verify proper meter calibration by performing a retest.
Note: Always make the final adjustment by turning In the thimble. If the new setting is a
higher number than the original, turn it back beyond the required figure and then come
back to the setting.