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Example 1: Transmit volume in gallons from a 36.67 pulse/gallon flow meter
Application:
Digitally transmit volume in gallons with two decimal places from a flow meter
with a K factor of 36.67 pulses/gallon. Also transmit 4-20 mA corresponding to 0-50 gallons.
Solution:
•
Under Input+Display tab, set Mode to Total, Function to “A Only”, and Gate Time to 0 sec
(to maximize display update rate). Set “Power-On Total” to “Restore Total” to retain total in
event of power loss.
•
Under Scaling tab, set Decimal Point to two places. If “Scale, Offset” is selected as scaling
method, set Scale to 2.72702 and Multiplier to 1. The product of Scale and Multiplier is
2.72702 hundredths of a gallon/pulse, which is the inverse of K factor. If Coordinates
scaling method is selected, enter High In and High Read to indicate that 36.67 pulses
should read 1.00 gallon.
•
Under Analog Out tab, set Range to “4-20 mA current”. Enter 0.00 gallons for Lo Range
Reading and 50.00 gallows for Hi Range Reading, as shown.