After the control policy relaxation “test”, people clearly realize that, even if the toxicity of the virus is weakened, but the elderly and patients with basic diseases still exist chest tightness, asthma, hypoxemia, respiratory difficulties in the risk of this group of people's families will need an oxygen concentrator to prepare for emergencies, the market demand for home oxygen concentrators increased.
Home oxygen concentrator must have oxygen concentration monitoring function
Most of the oxygen concentrator products are oxygen inhalation through oxygen mask or nasal oxygen tube, which belongs to open oxygen inhalation. When patients inhale oxygen, they will inhale some external air at the same time, and the actual oxygen concentration that reaches the lungs is the oxygen concentration after mixing the air.
In oxygen therapy and oxygen rehabilitation, too little oxygen inhalation will not achieve the effect of convalescence, and too much oxygen inhalation will cause harm, so it is crucial to monitor the oxygen concentration for convalescence and rehabilitation. At the same time, the national standard stipulates: home oxygen concentrator must be equipped with oxygen concentration monitoring function.
Oxygen monitoring sensor as the oxygen concentration of the oxygen concentrator monitoring the core device, its practical function is the key element of the evaluation of the equipment oxygen efficiency. At present, the common types of sensors for monitoring oxygen concentration are: Ultrasonic Oxygen Sensor and Zirconia Oxygen Sensor.
Ultrasonic Oxygen Sensor
Ultrasonic oxygen sensors use the speed of sound to measure the amount of oxygen in a gas sample. Ultrasonic waves propagate through a fluid and are affected by the velocity of the fluid and contain information about the flow rate. By detecting the received ultrasonic signals the fluid flow rate can be measured and thus the fluid flow rate can be obtained. In gas measurement, when there is a molecular weight difference between the components that make up a binary gas mixture, the speed of sound propagation varies with the components of the two gases, resulting in the gas concentration.
This indirect measurement method has the advantages of non-contact, wide range and high accuracy, and its application in oxygen generators helps to improve the accuracy and reliability of the oxygen concentration monitoring function.
Zirconia Oxygen Sensor
Zirconia oxygen sensors utilize heat and chemicals to detect oxygen, and measure gas concentration by generating a potential difference through the difference in oxygen concentration between the inner and outer sides of the zirconia, and the greater the difference in concentration, the greater the potential difference.
In actual oxygen generator industry applications and tests, compared to zirconia oxygen sensors. The sensors have the advantages of long life, no consumption and maintenance-free. In particular, the calibration of the maintenance-free surface reduces the end user's doubts about the instrument's performance. Secondly, continuous measurement with simultaneous measurement of concentration and flow rate helps to upgrade the instrument function in the future.
Open Type Transducer
The core component of the ultrasonic oxygen transducer is the open ultrasonic transducer, which utilizes the piezoelectric effect to convert electrical energy into vibration, resulting in the formation of ultrasonic waves, and does not contain a coil structure, with a wide measuring range. Ultrasonic wave has good directionality and strong penetrability, not subject to the interference of dust and electromagnetic field in the air, and not subject to the influence of solid surface color and temperature, the product has strong anti-interference ability.
- Large measuring range
- Strong anti-interference ability
- Low power consumption
- High reliability
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