Dispenser Calibration; Meter Calibration - Compac CNG Service Manual

Dispenser Calibration

Dispenser Calibration

Meter Calibration

Test the meter accuracy
Calculate the meter K-Factor
Input dispenser settings
Compac Industries Ltd.
Calibrating the meter involves:
 Comparing the dispensers stated amount dispensed to actual
amount dispensed.
 Adjusting the K-Factor if accuracy is not within the required
tolerance.
The K-Factor for each new dispenser is factory set
and usually does not need to be changed.
Record the dispensers current density factor and set it to read out in kg
dSF
Density Factor ( ) (see page 27)
1. Test the meter accuracy using Calibration Test Fill Procedure -
Method 1 (see page 68) or Calibration Test Fill Procedure - Method
2 (see page 68)
1. Make sure that the dispenser is idle, with the nozzle in its holster.
2. Press and release the K-Factor switch nine times.
The display shows the K-Factor as F X.XXXX (single nozzle
dispenser) or FA X.XXXX (Side A of a dual nozzle dispenser).
To view the K-Factor for side B, quickly press and release the K-
Factor switch eight more times when viewing side A. The display
shows Fb X.XXXX (side B of a dual nozzle dispenser).
With a dual dispenser, it's easier to set side A first.
3. Calculate the new K-Factor with the following formula:
Existing K-Factor x True quantity
New K-Factor =
For example:
Existing K-Factor = 0.98
Displayed amount = 5.80 kg
True quantity = 6.00 kg
New K-Factor =
1. Input the new meter K-factor (
Set the density factor back to its original value. (
Page 67
Displayed amount
0.98 x 6.00
5.80
= 1.0138 (4 decimal places)
FA Fb
& ) (see page 27)
dSF
www.compacngv.com
Meter Calibration
) (see page 27)