Question: 3. A liquid-level control system can be configured in either of two ways: with a control valve manipulating flow of liquid into the holding

3. A liquid-level control system can be configured in either of two ways: with a control valve manipulating flow of liquid into the holding

3. A liquid-level control system can be configured in either of two ways: with a control valve manipulating flow of liquid into the holding tank (Fig. E8.5a), or with a control valve manipulating the flow of liquid from the tank (Fig. E8.5b). Assuming that the liquid-level transmitter always is direct acting. For each configuration, what control action should a proportional pneumatic controller have, (a) If the control valve is air to open? (b) If the control valve is air-to-close? direct or reverse monl eluoleo es)T bne T eluctuo bris p Jugni inst rose ni eoimenyo en diw .nimu 28 of S8 ol LT LC esales oT (CN3 gsta s Tni nevig (a) LT LC %23 (b) Figure E8.5 (b) If the input Ym to a Pl controller changes stepwise (Ym(s) = 2/s) and the controller output changes initially as in Fig. E8.6, what are the values of the controller gain and integral time? %3D nit letnemhee rete amse ort p't) Slope = 1.2 min %3D t- Figure E8.6 6.

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