Liquid Controls IT275N - Manual (Page 9)

Sponsler, Inc. IT275N Remote Totalizer & Rate Indicator pg. 9 DOC#: MN-275N-A
C.F. = 84.7/250 = .3388
On the IT275I PCB:
Set S3 #1 ‘ON’ (
↓ Position) does not move decimal point
On the IT275F PCB:
Set S5@3, S6@3, S7@8, S8@8 (.3388)
Set S4 in ‘0’ Position (0.3388)
Note: If the gallons per unit volume such as 7.48 gallons per FT
3
is known, but not the unit volume per
gallon as required to calculate calibration factor; 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
Example 6:
The engineering unit is ACF (FT
3
)
K-Factor = 250 pulses per gallon
ACF = .13369 per gallon
C.F. = .13369 / 250 = .00053476
On the IT275I PCB:
Set S3 #4 ‘ON’ (
↓ Position) moves decimal point right 3 places
On the IT275F PCB:
Set S5@5, S3@3, S7@4, S8@8 (.5348 rounding the 4
th
digit)
Set S4 in ‘0’ Position (0.5348)
Example 7:
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. = .013369 / 250 = .00005348
On the IT275I PCB:
Set S3 #5 ‘ON’ (
↓ Position) moves decimal point right 4 places
On the IT275F PCB:
Set S5@5, S6@3, S7@4, S8@8 (.5348 rounding the 4
th
digit)
Set S4 in ‘0’ Position (0.5348)
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:
Formula 4 New C.F =
Actual Quantity
x Present C.F.
Displayed Quantity