Determine the Status of Lamps and Relays in the Circuit ?

Determine the statuses of all lamps and relay coils in this circuit, given the following process conditions:

Determine the statuses of all lamps and relay coils in the circuit

Consider below mentioned Conditions :

  • Flow = 3.5 GPM
  • Pressure = 41 PSI
  • Temperature = 155 Deg F
  • Level = 1.3 ft
  • Pushbutton A = unpressed
  • Pushbutton B = unpressed

Answer :

Fully annotated circuit schematic: “X” representing an open contact or de-energized load, and “→” representing a closed contact or energized load.

Find the Circuit Lamps Status

Recall that a process switch will be in its resting (“normal”) condition when the stimulus value is less than the trip threshold, and will be in its actuated condition when the stimulus exceeds the threshold.


  1. CR1 coil = de-energized
  2. Blue lamp = energized
  3. Red lamp = de-energized
  4. Amber lamp = energized

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Credits : by Tony R. Kuphaldt – under CC BY 1.0

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