Q3. A basic flapper/nozzle device is shown in Fig Q4. The pneumatic signal for the input bellows unit is proportional to the measured temperature within the range 0 – 500℃. The output signal range is to be 20 - 100 kN/m2.
The characteristic of the input bellows is 3 mm/ºC, and the characteristic of the nozzle is 0.1 kN/m2 per mm of flapper movement. The gain of the device = % change in output
Calculate EACH of the following:
(a) The flapper movement at the nozzle for 100% input change;
(b) The resulting change in output;
(c) The gain of the device;
(d) The new setting of x, the distance from the pivot to the nozzle, to achieve a gain of magnitude 0.7;
(e) The output pressure at 450°C with a gain of magnitude 0.7 if the output pressure was 50 kN/m2 at a temperature of 430°C.
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