What are the applications of pressure, flow, temperature and humidity sensors in ventilator systems?

Last Update Time: 2021-02-01 10:42:27

    At present, ventilator is the most needed medical equipment for patients at present, and improving breathing is an important treatment method. After the virus infection, dyspnea is a typical symptom of critically ill patients, and the ventilator can keep the alveoli at a certain pressure at the end of expiration, increase the amount of functional residual air, and prevent alveolar collapse. Purpose of respiratory therapy. A CPAP ventilator device can force air into the lungs and artificially apply a certain level of positive airway pressure throughout the breathing cycle. If the patient has apnea, the CPAP ventilator can perform the necessary mechanical ventilation according to a preset frequency. This requires the design and installation of multiple sensors in the ventilator to control the airflow, pressure, and humidity in real time, continuously, and accurately to maintain the patient's continuous breathing function. Therefore, breathing equipment will use gas mass flow, pressure, humidity, temperature and magnetic sensors to monitor and control air flow, pressure, temperature and humidity and other indicators, while supporting and ensuring stable motor control system operation.

   (1) Air flow sensor

     It is mainly used to measure the flow of oxygen into the system to ensure an adequate air supply. By judging the breathing rhythm of the patient during sleep, according to the speed of breathing, adjust the amount and speed of ventilation through the intake pump control, so that the patient's breathing and intake frequency are consistent to provide sufficient oxygen concentration in the lung.

   (2) Pressure sensor

     In a ventilator operating system, it is important to detect changes in patient's breathing pressure and vibrations (such as snoring). The carbon dioxide level during the patient's exhalation can also be measured and calculated by a differential pressure sensor. For example, the ventilator can measure a 2-inch water column pressure difference by using a differential pressure sensor to better obtain the patient's carbon dioxide output to adjust the input pressure. Specifically, the pressure sensor can convert the airway pressure into a differential signal and send the measured value to the circuit MCU to accurately make inhalation and exhalation judgments. After that, the MCU sends instructions to control the intake pump to increase or decrease the pipe pressure. Allows patients to breathe naturally without resistance.


   (3) Temperature and humidity sensor

     Temperature and humidity sensors are mainly used to measure and adjust the temperature and humidity of the air in the snorkel, to provide comfortable warm and humid air, to avoid patients with sore throat due to inhalation of dry and excessively high or low temperature air, affecting breathing and sleep quality. When humidification is needed in the air flow, the humidity sensor gives corresponding feedback information, and the controller performs precise humidity adjustment based on the data information to ensure the humidity range of the air flow. At the same time, a discrete thermistor is directly installed in the airflow path to detect the airflow temperature. Or use a temperature detection component to locate the thermistor element in the medium to be tested and protect the thermistor from damage. The detection assembly also keeps the hot air flow directly and evenly through the thermistor to accurately sense the temperature.

   (4) Magnetic sensor

     To keep the ventilator motor running smoothly, the ventilator also cools the motor components through a fan system. Magnetic sensors are used to sense motor operating parameters in the ventilator, such as Hall magnetic elements to support stable motor control and keep the motor running smoothly to reduce noise and vibration generated by the fan system.


If you want to know more, our website has product specifications for pressure, flow, temperature and humidity sensors you can go to ALLICDATA ELECTRONICS LIMITED to get more information