Liquid Controls DMS Setup - Manual (Page 44)

44
Single-Point Calibration
Single-Point Calibration (Initial Calibration) must be
performed before Multi-Point Calibration. Single-Point
Calibration sets the calibration curve for the meter. Multi-
Point Calibration sets the percentage deviation from the
curve at specific points along the curve.
Performing Single-Point Calibration requires use of a
volumetric prover or other calibrated device to compare
the meter delivery quantity against a standard.
As describe on page 40,
Pulses/Unit represents the
number of pulse edges counted by the LectroCount
per unit of measure. Since the unit may not have been
previously calibrated, leave the value set to the default
value of 0.00000000, or enter the nominal value of pulses/
unit for that meter size. For example, a Liquid Controls M7
flowmeter with a 1:1 packing gland will produce a nominal
2,200 pulses per unit.
1. Ensure the LectroCount is in Calibration mode. This
is accomplished by removing the switch plate and
rotating the red selector switch counterclockwise to
6 o’clock position.
2. Press START Key on keypad.
3. Fill a reliable Volumetric Prover at a typical flow rate
for the system. Prover Quantity will increment as
the product is dispensed into the prover. This reading
is based on existing value for Pulses/Unit.
4. After prover has been filled, press PRINT/END on the
keypad.
5. Enter exact prover reading in the Prover Quantity
field in place of the current value. The Pulses/Unit
field will update based on information entered.
6. Repeat Steps 2 through 5 to verify calibration.
If value read by the meter, does not match the volume
measured by the prover, re-enter the Prover Quantity
value with the new reading and repeat Steps 2 through
5 until prover quantity and meter quantity are equal.
7. Rotate LectroCount selector switch counterclockwise
out of the calibration position and reattach switch
plate.
Multi-Point Calibration may not be required for the
application in which the system is installed. If this is the
case, press Cnfg (F4) to return to Screen 7 on page 28.
Then move pointer to Diagnostics and press ENTER to
advance to Screen 11a on page 48.
If desired or required to perform Multi-Point Calibration,
continue to next page for detailed instructions.
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Units: Gallons
Setup
100.000000
-----------
PRODUCT CALIBRATION
Product #: 1
Linearization Mode:
Pulses/Unit:
Prover Quantity:
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