Liquid Controls IT150N - Manual (Page 6)

Sponsler, Inc. IT150N Remote Totalizer pg 6 DOC# MN-150N-B
CALIBRATION
Sensitivity
The sensitivity adjust R1 is located on the IT150I (Input and Analog) P.C.B. The amplitude of the signal
generated by the turbine is proportional to the rate of flow; therefore, sensitivity should be adjusted at the
lowest usable flow rate. Rotate R1 completely counterclockwise then slowly rotate R1 clockwise until the
display correctly responds then increase R1 slightly clockwise. The nominal R1 position is with the arrow
indicating 11 o’clock.
FIGURE 2
Calibration Factor
The calibration factor is derived from the turbine’s K-Factor (Pulses per gallon or other desired
engineering unit).
C.F. =
Engineering units
K-Factor
EXAMPLE 1: K-Factor = 250 pulses per gallon
Engineering Units = gallons
∴ C.F. = 1/250 = .004000
On the Factoring P.C.B.:
Set S6 #3 ‘ON’ (
↓ Position) for ÷ 100 (moves decimal point right 2 places)
Set S2@4, S3, 4, 5@0 (.4000)
Set S1 in ‘0’ position (.4000) (On the IT150I P.C.B.)
The electrical accuracy can be verified by injecting a stable frequency @ TB2-1,2 on the Mounting
P.C.B. and incorporating the following formula:
Total =
F x T x C.F.
D
Where F = Frequency in Hz ( )
T = Time (Duration) of test in seconds
C.F. = Calibration Factor as entered in S1-S5
D = Divider as entered in S6
Frequency = K-Factor x Flowrate
60
Formula #1
Formula #2