Liquid Controls LCR 600 Setup & Op - Manual (Page 30)

30
approximate k-Factors
valueS are for provIng uSe only. not to be uSed aS actual K-factorS.
lc meter Size Max Flow rate/Gallon revs / gallon pulses / gallon pulses / litre
P
60 12.237 4894.8 1293.11
M/MA 5
60 4.079 1631.6 431.04
M/MA 7/10 150 5.555 2222.0 587.01
M/MA 15/25 300 2.058 823.2 217.47
M 30/40 450 0.742 296.8 78.41
M 60/80
800 0.398 159.2 42.06
MS-75
700 0.255 102.0 26.95
MS-120
1200 0.158 63.2 16.70
calIbratIon Setup
to prove a meter system to a product with multi-
point calibration:
1. With the selector switch in the calibration position,
navigate to the Calibration Setup 1 screen.
2. Use the instructions on the page 29 to run a single point
calibration.
3. Navigate to Calibration Setup 3. Move the pointer  to
Linearization Mode: and select Setup.
4. Move the pointer  to the BeGIN CALIBRATION
deLIVeRY
field.
5. Press the
EntEr button to begin the calibration delivery
into a volumetric prover. A delivery screen will appear that
shows the gross volume and flow rate.
6. To end the delivery, move the pointer
 to the eNd
CALIBRATION deLIVeRY
field at the bottom of the
calibration delivery screen.
7. Move the pointer  to the Prover Quantity: and
enter the quantity indicated by the volumetric prover.
8. The LCR 600 will automatically display a Point #: list
box with the numbers 1-10. Select a number.
9. The LCR 600 will then display a Linearization Flow
Rate
field edit box. Enter the flow rate of the proving run.
The percent error is calculated automatically.
multi-point calibration proving
Multi-point calibration improves the overall meter accuracy by flattening out the accuracy curve across flow rates.
Although accuracy tends to lessen at lower flow rates, the repeatability of the meter remains consistent. The meter
might not be perfectly accurate at low flow rates, but it is inaccurate the same amount each time. Multi-point calibration
takes advantage of the steadfast repeatability of a Liquid Controls meter by identifying the amount of inaccuracy and
correcting it with a linearizing algorithm during deliveries. In order to apply the linearizing algorithm, the degree of error
for points along the accuracy curve must be identified by making a number of deliveries at different flow rates into a
volumetric prover. Multi-point calibration is very beneficial for meter systems that experience a wide range of flow rates
(for example, trucks that fill tanks of varying sizes) and for meter systems that have recently undergone maintenance
or other alterations that could change the accuracy curve itself.
Run the first multi-point calibration delivery at the same
flow rate used in step 2.
Keep flow Rates Even
For the first two proving runs, one should be near the maximum
flow rate and one near the minimum flow rate of the meter.
When choosing flow rates after the initial two proving runs, split
the difference until all points are within 0.25% of each other.
Multi-point Calibration tip
Proving runs are in gross volume only.