Food is the basic material necessary for human life. The storage and preservation of food is a major event that affects the livelihood of the people. One of the current methods commonly used in food storage is to measure and control temperature and humidity, but the effects are often not satisfactory, and some foods are still spoiled by microbial activity. For better protection, the most effective way is to introduce nitrogen into the granary to reduce the oxygen concentration in the air, thereby destroying the physiological activities of the microorganisms. The concentration of oxygen in the granary is monitored in real time by an oxygen sensor to ensure a low oxygen or even anaerobic storage environment.
For food storage, the most important is the control of environmental conditions to limit the growth and reproduction of bacterial microorganisms, thus avoiding spoilage. Adjusting the temperature and humidity of the granary can play a role in this, but it does not completely inhibit the activity of bacterial microorganisms. The filling of nitrogen into the warehouse to create a low-oxygen or even anaerobic environment is completely different. Because the microorganisms that cause mildew and spoilage of grain are almost all non-anaerobic bacteria, they cannot breed or survive in such an environment. Naturally, It is impossible to cause food corruption. To ensure that the granit is under hypoxic or anaerobic conditions, an oxygen sensor must be used to measure the oxygen content of the gas. Once the oxygen concentration exceeds the limit, an alarm can be issued through the control system and the aeration (nitrogen) can be initiated manually or automatically. ) Operation until the measured value of the oxygen sensor is less than the limit value.
The urban technology oxygen sensor adopts the three-electrode electrochemical principle, and the oxygen is diffused into the sensor to reduce the oxygen at the sensing electrode, thereby internally generating a current related to the gas concentration value, and by measuring the magnitude of the current, the gas to be measured can be obtained. The content of chlorine gas. In the urban technology oxygen sensor, in addition to the sensing electrode and the negative electrode, there is a reference electrode that is connected to the external voltage stabilizing circuit. It is used to stabilize the electromotive force of the sensing electrode when the measured oxygen content continues to rise, to avoid the induced electromotive force out of range, and make the measurement nonlinear.
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