Liquid Controls T575N - Manual (Page 6)

Sponsler, Inc. Model T575N Temperature Compensated Totalizer/Printer
FIELD CORRECTION
Sometimes, the actual response of the turbine flowmeter to the operating conditions will cause a small
CONSISTENT error (same percentage of error in several runs). To correct this condition, the calibration factor can
be adjusted by using the following formula:
New Calibration factor = Actual total X Present CF
Meter total
EXAMPLE 2:
NOTE:
TOTALS & CF used here are for illustration only.
Be sure to use the CF as dialed on SW1-SW4 of the unit being used.
Actual total: 500
Meter total : 520
CF = .4348 (Numbers dialed on SW1-SW4)
New Calibration factor = Actual total X Present CF
Meter total
New CF = (500/520) x .4348
New CF = (.96154) x .4348
New CF = .41807
New CF = .4181
Insert 4181 into SW1-SW4 respectively.
In the above example .96154 denotes that the meter is operating 3.85% fast and
multiplying the present calibration factor (.4348) by the ratio of Actual total: Meter total
(.9615) reduces the calibration factor 3.85%
Calibration Factor - Change of Engineering Units
The Model T575N can be calibrated to read in most engineering units. A new K-Factor for the desired engineering
unit must be derived from the flowmeter K-Factor (pulses per gallon) and the conversion factor (liters per gallon,
cubic meters per gallon, kilograms per gallon, etc.)
EXAMPLE 3: K-Factor = 230 pulses per gallon
Desired readout = liters
Conversion factor = 3.78541 liters per gallon
New K-Factor = K-Factor
Conversion factor
New K-Factor = .230
3.78541
Using the New K-Factor, determine the calibration factor following the 4 steps in the
calibration procedure.
EXAMPLE 4:
STEP 1: CF = 10/K
CF = .16458
STEP 2: DIVIDER = 1 (does not move the decimal)
STEP 3: Round CF to four digits
CF = .1646
STEP 4: Insert CF & DIVIDER
SW6 @ 0
SW1 @ 1 SW2 @ 6 SW3 @ 4 SW4 @ 6
STEP 5: No change of product, but verify SW5 is set for correct product.
Whenever a new factor is entered, a check should be made to ensure that the maximum count
speed would not be exceeded. The maximum count per minute with a 1:3 gearplate is 1351.
The maximum count per minute with a 1:2 gearplate is 1080.
Maximum Count = Full-scale flowrate frequency X 60
K-Factor
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