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Application of differential pressure switch and wind speed sensor in negative pressure ward

In the related news of wuhan pneumonia, the term of negative pressure ward has been mentioned many times. For example, the Shanghai public health clinical center located in jinshan district has set up a centralized isolation treatment site for new coronavirus pneumonia. The ward where the patient lives is a negative pressure ward. So what are the characteristics of the negative pressure ward? What is the principle of negative pressure ward? How are differential pressure switches and wind speed sensors applied to the ventilation system in the negative pressure ward?

Negative pressure ward refers to the pressure inside the ward is lower than the pressure outside the ward, the pressure inside the ward is lower than the pressure outside the ward, which means the air inside the ward will not freely diffuse to the outside world, but through the special channel in time to a fixed place. If there is a wuhan pneumonitis coronavirus in the ward, it will also escape with the exhaust system and be eliminated by the disinfection filtration system. This is also an important condition emphasized by WHO when prescribing the rescue of pneumonia patients in wuhan, and it is difficult for many hospitals in China to reach this level.

The function of the negative pressure isolation ward for patients with pneumonia in wuhan mainly has two points. One is to use the principle of negative pressure to isolate pathogenic microorganisms. The other is to dilute the concentration of pathogenic microorganisms in the ward through ventilation and reasonable air distribution, and make the medical staff in a favorable wind direction to protect the work safety of medical staff.

Then the application of differential pressure switch and wind speed transmitter in the negative pressure ward is discussed below. The negative pressure isolation ward USES one set of air supply purification device and two sets of exhaust air purification devices, both of which need to monitor the air flow rate in real time, and replace the filter element in time when the filter cotton is blocked to a certain extent.
Air differential pressure switch, also known as the negative pressure switch, its main function is mainly to detect the pressure of the ventilation duct or the pressure of the negative pressure ward, when the pressure is insufficient, the timely alarm signal to remind the maintenance personnel to replace the filter element or other maintenance operations.

A wind speed sensor, also known as a wind speed transmitter or an air volume transmitter, is an instrument that detects air velocity in a ventilation duct and can output 4-20ma or rs-485 signals to monitor air velocity in real time. On the ventilation system of the negative pressure ward, the wind speed sensor can monitor the air velocity in real time, so that the air velocity of the air supply system and exhaust system is balanced, and ensure a certain air velocity, so that the air in the ward is updated in time.



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