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Use safe and reliable Safety relay Realize safe and reliable early pre-opening of the door and releveling functions Equipped with a manual door lock detection switch, it can conveniently conduct UCMP function testing Size:101*76.5mm
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How to choose the suitable Pulmonary Function Testing device Ultrasonic type is the best choice. In recent years, with the rapid development of modern electronic technology and bioengineering, Pulmonary Function Testing devices are updating continually, and they are more sophisticated and perfected gradually. Traditionally water seal Pulmonary Function Testing device, wedge Pulmonary Function Testing device,� dry rolling-seal Pulmonary Function Testing device are phrased out of market because they could not connect with electronic computers. After 2000, ultrasonic Pulmonary Function Testing devices have been used internationally to replace traditional differential pressure Pulmonary Function Testing device, turbine Pulmonary Function Testing device and thermal Pulmonary Function Testing device. The main reason is that these three principles have some limitations as below: 1. Hygiene problem: it is difficult to clean thoroughly, and there is a very high risk of cross-infection in long-term use; 2. Unable to measure lower flow; 3. Heavy reliance on gas composition and temperature; 4. Calibration and adjustment required
Principles of ultrasonic Pulmonary Function Testing device The ultrasonic time difference method uses a pair of ultrasonic transducers to alternately (or simultaneously) transmit and receive ultrasonic waves. By observing the difference in the propagation time between the upstream and the backward flow of the ultrasonic in the medium (gas or liquid), the fluid velocity is measured indirectly, and then calculate the flow data based on fluid velocity. The flow measurement based on the ultrasonic principle is only influenced by the flow and geometry, and accuracy will not be affected by temperature, gas composition, humidity or pressure. So it is a perfect alternative to differential pressure and turbine principles, and is the best choice for Pulmonary Function Testing device.
