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Determine Voltage Drops at Respective Flow Rates in Loop Diagram

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

Determine Voltage Drops at Respective Flow Rates

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:

Flow Transmitter Loop Diagram

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

Share Your Answers for the remaining questions.

Credits: Tony R. Kuphaldt

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2 comments

Tarique February 10, 2020 at 9:25 pm

How voltage across fy-14 is 2.6 volts at 100gpm can your ellaborate please???
My mail id engtarique451@gmail.com or whatsapp no. +96660330861
I dont know how it came please reply me

Reply
S Bharadwaj Reddy February 10, 2020 at 9:44 pm

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/

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Determine Voltage Drops at Respective Flow Rates in Loop Diagram

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