Liquid Controls IT200N - Manual (Page 8)

Sponsler, Inc. IT200N Remote Rate Indicator pg. 8 DOC#: MN-200N-D.DOC
On the Factoring P.C.B.:
Set S1@3, S2, 3, 4, 5@0
Example #5: The engineering unit is ACF (FT
3
)
K-Factor = 250 pulses per gallon
ACF = .13369 per gallon
C.F. = .250/.13669
C.F. = 1870
On the Factoring P.C.B.:
Set S1@0, S2@7, S3@8, S4@1, S5@0
Example #6: Desired Engineering Unit is ACF x 10
K-Factor = 250 pulses per gallon
ACF = .13369 per gallon
In order to establish x 10, decrease ACF/gal by a factor of 10
C.F. = 250/.013369 = 18700
On the factoring P.C.B.:
Set S1@0, S2@0, S3@7, S4@8, S5@1
If the gallons per unit volume, such as 7.48 gallons per FT
3
, is known but no the unit volume per gallon
as required to calculate the calibration factor, simply take the reciprocal of gallons per unit volume to
derive the unit volume per gallon i.e. 7.48 gallons per FT
3
– 1/7.48 = .13369 FT
3
per gallon.
Field Correction of Calibration Factor
To adjust the calibration factor to reflect the turbine’s actual response to the operating conditions,
incorporate the following formula:
New C.F =
Displayed Quantity
x Present C.F.
Actual Quantity
Example #7: Actual = 50
Displayed = 52
C.F. = 250
New C.F.= 52/50 x 250 = 1.04 x 250 = 260
On the factoring P.C.B.:
Set S1@0, S2@6, S3@2, S4@0, S5@0
In the above example, 1.04 denotes that the meter is operating 4% fast. Multiplying the present C.F.
(250) by the Displayed : Actual Ratio (1.04) effectively reduces the error by increasing the C.F. 4%.
Example #8: Actual = 52
Displayed = 50
C.F. = 250
Formula 4