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SECTION 4 CALIBRATION OF THE FLSC-51/61B
4.1 INTRODUCTION
The FLSC-51/51B Flowmeter Signal
Conditioning/Interface/Subsystem has a special feature which
allows the user to scale the flow information into the desired
units of measurement. This feature is termed the SYSTEM
FACTOR and is composed of two arrays of switches (the
SYSTEM FACTOR thumbwheel switch and the SYSTEM
FACTOR MULTIPLIER dip switch).
By utilizing the SYSTEM FACTOR, the total flow may be
indicated as pulse outputs in gallons, pints, liters, barrels, cc’s.
4.2 PROCEDURE
Begin by obtaining a copy of the calibration sheet for the
flowmeter to be used with the FLSC-51/51B, Obtain the desired
units of measurement from the project supervisor or equipment
specification.
From the calibration sheet for the flowmeter (supplied with
flowmeter obtain the MEAN K FACTOR in cycles/gallon,
designate this as the K FACTOR.
Finally, note the maximum f low rate in desired units as R
(MAX) in unit volumes/minute. The value of R (MAX) should
be less than the maximum count speed for the host system.
Compute the equivalent number of pulses per desired
measurement unit, designed K, from the K FACTOR for the
flowmeter and the conversion factor relating the gallons per
user’s desired measurement units, This may be done with the
following equation and the aid of a conversion chart.
K’ = K FACTOR x CF
WHERE
CF is the conversion factor equal to the ratio of the number of
gallons per user chosen volume unit.
Example:
Given: 200 pulses/gallon = K FACTOR
Desired units of measurement = Liters
Obtain: Conversion Factor CF = .2642 gallons/liter
from Table
Calculate: K1= 200 x .2642
= 52.84 Pulses
Liter