13 Meter Calibration Procedure
Helix dispensers may contain either iMeters or Xflo™ Meters. The calibration procedure in this
section is used for either of these meters.
Each meter assembly contains two meters. The WIP pulser (or XWIP for Xflo meter) contains
two sets of sensors, one set for each meter. On the front of the pulser, there are two calibration
doors, one for each meter in the assembly. The door closest to the front of the dispenser controls
calibration of the front meter and the other door controls calibration of the rear meter. Only one
door may be opened at one time during meter calibration (only one meter at a time can be cali-
brated). It is important to verify the product grade for each assembly to assure the correct door
is opened during the calibration process.
Dispensers have an operation mode setting that establishes the pulser’s calibration mode. This
is set at the factory in the dispenser template (Read Only function F16). The iMeter and the Xflo
meter are calibrated using the same procedure as shown in this section.
NOTE 1: In the Liter mode, in addition to 20 liters, a 10 liter of 5 liter test measure may be used
if required by the application. However, you should check with your jurisdiction on Weights &
Measures tolerance requirements.
NOTE 2: For NA, acceptance of +/- 3 cu. in. for a 5 gallon measurement and +/- 50 ml for a 20
liter measurement is only required for newly installed, newly placed in service devices for 30
days. After 30 days, the tolerance is increased to +/- 6 cu. in. for 5 gallons and +/- 100 ml for 20
liters.
This section has been separated into two parts since North America (NA) and Europe (IEC)
use different calibration procedures.
13.1 NA Procedures
Figure 13.1 at the end of this section shows the sealing bracket and pins used on the iMeter in
North America (NA).
Variables in method and environment can account for significant measurement error during
meter calibrations, therefore the procedure below should be followed when calibrating or verifying
any meter to ensure proper calibration.
During the Calibration Procedure
•
Ensure the lines and the dispenser have been purged as per the instructions in the dispenser
installation manual.
•
Use NIST-traceable prover and ensure that it is on a level surface.
•
Perform a can wet-down.
•
Use consistent drain times (minimum 30 seconds recommended).
•
Ensure splashing of fluid is minimized and nozzle has been drained of excess fluid.
WM048523 Rev 08 01/2019 201
13 Meter Calibration Procedure
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