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

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Credits: Tony R. Kuphaldt

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5 thoughts on “Determine Voltage Drops at Respective Flow Rates in Loop Diagram”

  1. 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.

    Reply
  2. 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

    Reply

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Determine Voltage Drops at Respective Flow Rates in Loop Diagram

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