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Monitoring principle and installation method of negative oxygen ion detector
The degree of air freshness, apart from PM2.5 can be used as a standard, an important indicator is to look at the concentration of negative oxygen ions in the air. Negative oxygen ions called 'air vitamins' are simply negatively charged oxygen ions in the air. Its concentration is proportional to the number of plants and humidity. Negative oxygen ions are the opposite of PM2.5. High PM2.5 concentration means poor air quality. The higher the concentration of negative oxygen ions, the better and fresher the air. According to the clean air standards defined by the World Health Organization, the concentration range of negative oxygen ions reaches 900/cm³, which can be counted as 'fresher'. In layman's terms, the contribution of negative oxygen ions to us ordinary people may be that no matter how tired and nervous people are, they will feel refreshed when they walk around a place with high negative oxygen ions. Now, many scenic spots will be equipped with negative oxygen ion detectors to detect the concentration of negative oxygen ions in the scenic spots. At the same time, the real-time monitoring results will be displayed through the large LED screen, so that visitors can understand the environmental conditions in the scenic spots. So, how does the negative oxygen ion detector monitor the concentration of negative oxygen ions? Monitoring principle of negative oxygen ion detector At present, there are two detection principles of negative oxygen ion detector: parallel electric plate type and double cylindrical shaft type. Parallel electric plate type negative oxygen ion detector is a commonly used one in the middle and low-end air negative oxygen ion detector. The detection principle is: A and B are a set of parallel and mutually insulated electrodes. There is a ring-shaped bipolar electrode at the top of the B pole. The air is sucked in by the fan in the lower right corner, and the negative ion in the air hits the A/B electrode to discharge. , The electric charge is conducted to the E ring electrode to form a self-discharge, and the discharge signal is recorded, so that the quantity and size of positive and negative ions in the air can be measured. There is also a double cylindrical shaft type negative oxygen ion detector, which is much higher-end than the parallel plate type detector. It is a mature and complex negative ion detector. At present, the excellent air ion detector basically uses Detector of this structure. The overall structure is composed of 3 concentric cylinders. The outer cylinder and the inner shaft are electrodes. When the air passes through the cylinder, the ions hit the cylinder and the shaft to generate discharge, and the discharge signal is recorded, so that the number and size of positive and negative ions in the air can be measured. Measurement. The negative oxygen ion detector adopts the principle of double cylinder axis, which effectively solves the inherent electrolysis edge effect of the parallel electric plate structure. At the same time, the structure of the cylinder itself and the special air intake method can keep the air flow through Smoothness, the detection accuracy of the number and size of ions has been greatly improved. The detector is equipped with a color touch screen, real-time display of negative oxygen ion concentration in the air, temperature and humidity, formaldehyde, PM, TVOC and other sensors can be selected at the same time, optional data storage and U disk export function. The equipment adopts standard MODBUS-RTU communication protocol, RS485 signal output, and the maximum communication distance can reach 2000 meters (measured). Installation method of the negative oxygen ion detector 1. It can be installed and fixed with screws. The size of the mounting hole is as follows (unit: mm). The air port is unobstructed, otherwise it will affect the accuracy of the data. 2. The installation needs to be stable, and the height of the center of the detector from the ground should be 1.5m. 3. The shell and outer box of the collector should be well grounded. 4. With lightning protection facilities, the grounding resistance should be less than 4Ω. 5. A protective fence can be optionally set up, the height of the fence should not exceed 1.2m, and the distance between the instrument and the fence should be greater than 2.0m.
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