18-08-2014, 11:01 AM
Pneumatic consist three tube, in which two tubes gives two different pressure transducer and tube give input to oxygen sensor .Differential pressure transducer which is use is nothing but flow sensor, it senses difference between two pressure. Oxygen sensor is electro mechanical and senses oxygen in breath. Oxygen signal is amplified by complifier and differential pressure transducers output is amplified by instrumentation amplifier as well as instrumentation amplifier is use for balance output of differential pressure transducer. Low pass filter is required to reduce the noise from signal or filter the signal.
Pneumatic consist three tube, in which two tubes gives two different pressure transducer and tube give input to oxygen sensor .Differential pressure transducer which is use is nothing but flow sensor, it senses difference between two pressure. Oxygen sensor is electro mechanical and senses oxygen in breath.
Oxygen signal is amplified by complifier and differential pressure transducers output is amplified by instrumentation amplifier as well as instrumentation amplifier is use for balance output of differential pressure transducer. Low pass filter is required to reduce the noise from signal or filter the signal.
Low pass filter is given to Analog to Digital converter because microcontroller required digital input microcontroller is used for fast processing & control the operation.