In Flow Control Loop, Trace the path of current in the loop diagram signal wiring, then determine voltage drops at the respective flow rates. Examine the following loop diagram:
Loop Diagram
Trace the path of current in the signal wiring, then determine the following voltage drops at the respective flow rates. Assume a power supply voltage of exactly 24 volts DC:
Voltage across FY-14 resistor = __________ ; Flow rate = 100 GPM
Voltage between terminals TB40-3 and TB40-4 = __________ ; Flow rate = 200 GPM
Voltage across FT-14 transmitter terminals = __________ ; Flow rate = 175 GPM
Voltage between terminals TB64-8 and TB27-15 = __________ ; Flow rate = 200 GPM
Solution:
Voltage across FY-14 resistor = 2.6 volts ; Flow rate = 100 GPM
Voltage between terminals TB40-3 and TB40-4 = 19.8 volts ; Flow rate = 200 GPM
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Credits: Tony R. Kuphaldt
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2 comments
How voltage across fy-14 is 2.6 volts at 100gpm can your ellaborate please???
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I dont know how it came please reply me
From the diagram, the flow transmitter range is 0 to 250 gpm
Now Calculate the loop current at 100 gpm, it is 10.4 mA
Calculate Voltage, V = I.R = 10.4mA x 250 = 2.6 v
You can use this online calculator: https://instrumentationtools.com/instrumentation-calculator/