Loading Post Calibration; Meter Calibration - Compac CNG Installation And Service Manual

Meter Calibration

Loading Post Calibration

Meter Calibration
Test the meter accuracy
Calculate the meter K-Factor
Input loading post settings
Compac Industries Ltd.
Calibrating the meter involves:
 Comparing the loading posts 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 loading post is factory set
and usually does not need to be changed.
Record the loading post's current density factor and set it to read out in
dSF
kg Density Factor ( ) (see page 18)
1. Test the meter accuracy using Calibration Test Fill Procedure -
Method 1 (see page 41) or Calibration Test Fill Procedure - Method
2 (see page 41)
1. Make sure that the loading post 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 loading
post) or FA X.XXXX (Side A of a dual nozzle loading post).
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 loading post).
With a dual loading post, 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 40
Loading Post Calibration
Displayed amount
0.98 x 6.00
5.80
= 1.0138 (4 decimal places)
FA
) (see page 18)
dSF
www.compacngv.com
) (see page 18)