Liquid Controls IT375 - Manual (Page 9)

Sponsler, Inc. Model IT375 Operation Pg. 9
3.4 CALCULATION OF RATE
The flow rate, R, is calculated as follows:
R=
K f x H
where f is the input frequency in Hz (pulses/second).
H is the timebase of rate and is 1 for seconds, 60 for minutes, 3600 for hours and 86,400 for days.
K is the Kfactor (pulses/unit volume).
The Kfactor is flowmeter dependent and is supplied with the flowmeter. It will be either on a calibration certificate or
stamped on the body of the meter.
The user programs the Kfactor and selects the timebase during the programming procedure.
3.5 TOTAL CONVERSION
The Total Conversion Factor is programmed to enable the rate to be displayed in one engineering unit and the totals to
be displayed in another. For example, the rate can be displayed in gallons/minute and the totals in barrels.
The Total Conversion Factor is a division factor which is used to convert the totals to a different engineering unit than
the rate unit. Therefore, it only affects the totals (both resettable and accumulated).
Example:
If the Rate is required in gallons/minute:
1. The Kfactor would be programmed as pulses per gallon.
2. The Timebase would be programmed as minutes.
If the Totals are required in barrels:
1. The Total Conversion Factor is programmed as 42 because there are 42 gallons in a barrel. All totals will now
totalize in barrels.
Below is a table containing common units and their corresponding Total Conversion constants:
Rate/Unit Time Totals
Gallons (US)/Unit Time
Total Conversion Factor
Barrels (oil) 42.000
Litres/Unit Time Kilolitres 1000
Litres/Unit Time m 3 1000
ml/Unit Time Litres 1000
Mgallons/Unit Time Acre-feet 0.32587
Equivalency
≤ 1 rate unit ÷ equivalency
Equivalency
≥ 1 rate unit ÷ reciprocal of equivalency (1/equivalency)