LCR.iQ - Setup and Operations Manual
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device, then press
OK
. At this point, the LCR.iQ will calculate the percent of error between the
prover and register, and automatically adjust the Pulses/Unit accordingly.
Repeat this process until the LCR.iQ register is within local Weights and Measures tolerance
or company regulations. Once all calibrations are made and setup is complete, tighten the
calibration bolt on the side of the LCR.iQ housing. If a ticket printer is connected and a final
calibration ticket is desired, insert a ticket before exiting calibration mode and a ticket will print
when prompted.
Multi-point Calibration
Multi-point calibration is used to improve the accuracy of a flow meter across its full rated flow
rate range, resulting in a much flatter accuracy curve. Accuracy of a flow meter tends to
lessen at lower flow rates however repeatability of the meter remains consistent. A meter
might not be perfectly accurate at low flow rates, but it is inaccurate by 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.
To begin the multi-point calibration process, ensure the LCR.iQ is in the calibration mode by
removing any existing seal wire and loosening the calibration bolt on the side of the register
housing approx 5-6 turns. If a ticket printer is connected to the LCR.iQ, make sure a ticket is in
place and the printer is ready. If connected, the register will print a calibration ticket showing
the current calibration as well as any existing multi-point calibration information of the register.
If no ticket printer is connected or the calibration ticket is not desired, press the
Abort
key to
skip the print process.
Before starting the process of multi-point calibration, ensure that the initial single point
calibration has been completed and the meter is accurate and repeatable. All multi-point
factors are based on this initial calibration.
Once in the calibration mode, select
Calibration
from the main menu to access the calibration
screens. Scroll to Calibration screen 4/4 to access the multi-point calibration fields.
