What is the principle of negative oxygen ion sensor?
Negative oxygen ions in the air are formed by the combination of oxygen molecules in the air with free electrons, with a negative charge and excess electrons, with the reputation of "air vitamin". Air negative oxygen ions have the characteristics of migration far, high activity. Medical research shows that: negative air oxygen ions on the human body has a health care effect. Negative oxygen ions can penetrate the human blood-brain barrier, play its biological effect.

The World Health Organization has also made relevant regulations on the standard concentration of negative oxygen ions for fresh air. The negative oxygen ion sensor can monitor the air negative oxygen ion for forestry, environmental protection, meteorology, tourism units, etc., and provide reliable data for improving the air in rural and urban areas, which is of very great significance to human society.

Negative oxygen ion detector monitoring principle:
According to the different structure of the collector, the mainstream negative oxygen ion sensor can be divided into two types: parallel electric plate type and double cylinder shaft type.

1. Parallel electric plate type negative oxygen ion sensor
Parallel electric plate type negative oxygen ion sensor is currently a more common method of low-end air ion detector. A and B a set of parallel and mutually insulated electrodes, B pole top side of a ring bipolar electrode, air through the lower right corner of the fan inhalation, negative ions in the air hit A/B electrode discharge, charge conduction to the E ring electrode to form self-discharge, discharge signal is recorded, so that the number and size of positive and negative ions in the air can be measured.

This detector is technically more mature, the cost is also relatively low, but vulnerable to the external environment, in addition to this structure's own weaknesses easily lead to electrolysis edge effect, easy to cause airflow turbulence, resulting in large bias detection results.

2. Double cylinder shaft type negative oxygen ion sensor
Double cylinder shaft type negative oxygen ion sensor is currently a mature method of medium and high-end air ion detector. The overall structure consists of three concentric cylinders, the outer cylinder body and the inner shaft for the electrode, air through the cylinder, ions hit the cylinder body with the shaft to generate discharge, discharge signal is recorded, so that the number and size of positive and negative ions in the air can be measured.
https://www.renkeer.com/negative-ions/