Endogenous Growth Speech

A NOVEL APPROACH TO MONITOR AMMONIA IN EXHALED BREATH

GEERTHY T1 NARAYANAN C2 PRADEEP K3

DEPARTMENT OF BIOMEDICAL ENGINEERING DEPARTMENT OF BIOMEDICAL ENGINEERING DEPARTMENT OF BIOMEDICAL ENGINEERING

DHANALAKSHMI SRINIVASAN ENGG. COLLEGE DHANALAKSHMI SRINIVASAN ENGG. COLLEGE DHANALAKSHMI SRINIVASAN ENGG. COLLEGE

PERAMBALUR, TAMIL NADU, INDIA PERAMBALUR, TAMIL NADU, INDIA PERAMBALUR, TAMIL NADU, INDIA

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Endogenous molecules give the clinical importance of ammonia in breath which arises from metabolic processes. Initially the stomach and intestines break down food substances into amino acids and other nitrogenous compounds such as ammonia which diffuse into blood, furthermore these nitrogen compounds are converted into less toxic substances known as urea by

Fig. 1.Sensor Measuring Circuit

The sensor constitute of six universal configuration pins, in which heater pin (H) provided with 5v for heating the coil. Circuit voltage (Vc) is applied across the sensor’s pin (A and B) and the load resistor (RL) connected in series. The change of sensor resistance (Rs) is measured indirectly as a change in voltage across the load resistance. ii) Calibration: Gas sensors are needed to be calibrated and periodically checked to ensure sensor accuracy. The calibration is carried out using the micro syringe (500ul). First, the sensor was exposed to fresh air through aerator, which gives the air flow pressure rate at 0.01MP to determine the zero baseline i.e., the sensor response in absence of gas. Fig.2.explains the sensitivity of the sensor for various concentration of ammonia Fig.2. Sensitivity Characteristics of sensor The sensitivity characteristics of the sensor has been calculated and it is expressed in the equation (1) Rs = (Vc/VRL - 1) * RL