Liquid Controls T350N-P - Manual (Page 6)

Sponsler, Inc. T350N-P Truck Totalizer/Printer pg. 6 Doc# MN-T350N-P
CALIBRATION
The Sensitivity adjusts (R1) should be adjusted at the lowest expected flow rate.
Turn R1 completely Counter-Clockwise then slowly adjust R1 Clockwise until the
display increments then increase R1 slightly Clockwise again. In the nominal R1
position the arrow indicator will be in the 11 o’clock position.
Sensitivity
The Calibration Factor is derived by taking the reciprocal of the meter’s “K-
Factor” (pulses per gallon or other desired engineering unit).
Calibration Factor
C.F. =
K-Factor
Engineering Units
It is desired that zero not be dialed as the first digit on the factor switches. The
CF, in most cases, will start with at least one zero. The multiplier switch on the
factoring board will allow multiplying by 1, 10, 100, 1000, or 10000 to move the
decimal the required digits.
S4 position Multiplier
0 1
1 10
2 100
3 1000
4 10000
Example 1: K-Factor = 230 pulses per gallon
Engineering units desired = gallons
C.F. = 1/K = 1/230 = .00434782
Multiplier = 100; S4=2,
Factor S3=4, S2=3, S1=4, S0=8
The electronic accuracy can be verified incorporating the following formula for a
timed test:
Total Displayed = Frequency X Time in seconds X C.F.
Example 2: C.F. = .004348
Time = 1 min = 60 seconds
Frequency = 500 Hz
Total = 500 X 60 X .004348
Total = 130.4 = 130