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

**Share Your Answers for the remaining questions.**

Credits: Tony R. Kuphaldt

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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

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/

Voltage across FY-14 resistor = __________ ;

Voltage between terminals TB40-3 and TB40-4 = __________ ;

Voltage across FT-14 transmitter terminals = __________ ;

Voltage between terminals TB64-8 and TB27-15 = __________ ;

if 80 GMP. thank you.

I need a sample.

Voltage across FY-14 resistor = 2.6 Volts ; Flow rate = 100 GPM

Voltage between terminals TB40-3 and TB40-4 = 24 volts ; Flow rate = 200 GPM

Voltage across FT-14 transmitter terminals = 24 volts ; Flow rate = 175 GPM

Voltage between terminals TB64-8 and TB27-15 = 24 volts ; Flow rate = 200 GPM

Why is the voltage between terminals TB40-3 and TB40-4 = 19.8 volts ; Flow rate = 200 GPM? It should be 24 volts because the analog output and inputs is 4 to 24 mA and constant voltage of 24 voltage because parallel connection from the PS to FT

Hello guys!

Correct answers:

1. 2.6V

2. 19.8V

3. 20.2 V

4. 0.0 V

If you are still confused pls connect with me I will send my solution

Alikhansadykov97@gmail.com