A tank of fluid employed in a chemical process is being monitoredwith three sens

Question

A tank of fluid employed in a chemical process is being monitoredwith three sensors. The sensors measure temperature, pressure andfluid level. If all the sensor measurements are in the normalrange, the sensor outputs are low. If the measurements are outsidethe normal range, the sensor outputs are high. Design a logiccircuit that will produce a high signal for an alarm under thefollowing conditions:

1. pressure and temperature are too high.
2. fluid level is too high and either pressure or temperature orboth are too high.

Explanation / Answer

Required logic is F(P, T, H) where P is the pressure, T is thetemperature and H is the fluid level. F(P,T, H) is the signal for alarm which is high for the followingcondition 1. pressure and temperature are too high. 2. fluid level is too high and either pressure or temperature orboth are too high. Which implies that if two of the P, H, T are high F(P,T,H ) ishigh, otherwise low. Hence it is straight forward to say that F(P, T, H) = PT+TH+PH where each of the Variable P, T, H takes either '0' or '1'. ---------------------------------------------------

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