LAUREL LT Series, Руководство пользователя, Страница: 26 / 56

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Example 3: Transmit total volume by adding two flow meter channels
Application: Digitally transmit total volume in gallons to two decimal places from two pipes
dispensing liquids into the same tank. Flow meter A is calibrated to 36.67 pulses/gallon, flow
meter B to 58.12 pulses/gallon. Assign the transmitter’s analog output to total volume.
Solution:
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Under Input+Display tab, check Extended (an Extended main board is required for Total).
Set Mode to Total and Function to “A+B”. “A Total + B Total” will be Item 1, A Total will be
Item 2, and B Total will be Item 3. Set Gate Time to 0 sec to maximize the update rate. Set
“Power-On Total” to “Restore Total” to retain total in event of power loss.
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Under Scaling tab, set both decimal points to two places. If “Scale, Offset” is selected as
scaling method, set Scale 1 to +2.72702 for A Total and Scale 2 to +1.72057 for B Total. Set
both Multipliers to 1 so that the product of Scale and Multiplier produces the inverse of K
factor expressed in hundredths of a gallon/pulse. If Coordinates is selected as the scaling
method, enter High In and High Read as shown to indicate that 36.67 pulses should read
1.00 gallon for Channel A, and that 58.12 pulses should read 1.00 gallon for Channel B.
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Under Analog Out tab, set Source to Item 1 (A Total + B Total).