- Certified weighing scales with a read-out accuracy of +/- 20 g or
better and a range of 0 – 120 kg
- A CNG cylinder with a fill and release valve
To carry out the calibration test fill procedure (Method 1):
- Put the CNG cylinder on the scales.
- Empty the CNG cylinder by venting it to the atmosphere.
DANGER: Always vent cylinders in a safe manner and safe location.
- Zero the TARE read-out on the scales.
- Fill the CNG cylinder from the dispenser.
- Compare the read-out weight (True Quantity) on the scales with the
dispenser display (Display Amount).
If the results are not within 0.5% of each other, you will need to change the
calibration, as per the Calculate and Set the New K-Factor section.
Method 2 of checking calibration involves filling a vessel and comparing a
master meter reading with the dispenser display readings.
This method assumes that the master meter is sufficiently accurate and
reliable enough to be considered a good reference.
Before you start, make sure you have:
- A master meter
To carry out the calibration test fill procedure (Method 2):
- Plug the dispenser refuelling probe into the master meter, and then
plug the master meter refuelling probe into a vehicle to fill.
- Turn on the master meter valve, if applicable, and reset to zero.
- Fill the vehicle from the dispenser.
- Turn off the dispenser refuelling valve and master meter valve, if
applicable.
- Compare the master meter read-out (True Quantity) with the dispenser
display (Display Amount).
If the results are not within 0.5% of each other, you will need to change the
calibration, as per the Calculate and Set the New K-Factor section.
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