SHENZHEN Ever-smart Sensor Technology
Main: vehicle pressure sensor, civil pressure sensor, industrial pressure sensor
Jiangmen Ever-smart Intelligent Control Instrument Co.,LTD
Main: Production and production systems for precision instrumentation
and pressure sensors
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SHENZHEN Ever-smart Sensor Technology
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Differential pressure sensor use and selection characteristics
differential pressure sensors are commonly used in test stands, wind tunnels, leak detection systems, and other applications. this article describes five features and considerations to be aware of when selecting sensors for differential pressure and critical pressure applications.
first, the direction effect
improper installation, vibration, and even system maintenance can result in changes in the orientation of the differential pressure sensor, which is known as directional effects. directional effects have long been a problem for other types of sensing technologies. even a properly installed sensor will have an edge gravity effect, because the 180 degree rotation of the sensor will change from positive to negative, resulting in a 2g force change. in this case, the sensor cannot distinguish the force exerted by gravity from the force applied through the pressure port. therefore, the sensor combines the gravity-weighted effect with the port pressure and sends the wrong signal. for sensors filled with silicone oil or other isolation media, the directional effect of the sensor as it rotates is more pronounced. the diaphragm weight of these sensors and the weight of the filled liquid can affect the differential pressure sensor. similarly, the sensor cannot measure the true pressure and will send an erroneous value with the influence of the azimuth change.
second, the vibration
low frequency vibrations from nearby motors or fans can also affect properly positioned sensors. for example, liquid in an oil-filled sensor may pick up low-frequency vibrations and apply an inertial load to the diaphragm, which is mistaken for process pressure changes. in order to avoid this vibration effect, the end user needs to install the sensor in a quiet area at the far end. similarly, if the reference port is connected to the atmosphere, it needs to be connected to an area where there is no vibration noise and wind. for wind tunnels, due to the installation of a pitot tube, both pressure ports can be connected to remotely mounted sensors via hoses or half hoses to prevent air disturbance noise or mechanical vibrations from being transmitted to the sensor.
红包扫雷10元7包数字算几率 third, overvoltage protection
红包扫雷10元7包数字算几率 differential pressure sensor overvoltage protection and reverse pressure protection have always been a concern of manufacturers of leak detection systems. these systems seek for small leak rates in differential pressure and high static pressure applications. leak detection manufacturers always want to measure increasingly lower leak rates. since the leak rate is directly proportional to the differential pressure, these manufacturers want to be able to measure smaller and smaller differential pressures. to achieve this goal, static test pressure needs to be increased to a higher level.
红包扫雷10元7包数字算几率 fourth, the impact of pipeline pressure
红包扫雷10元7包数字算几率 in addition to overpressure, changes in line pressure need to be considered, especially in leak detection applications where static line pressure is high. line pressure is the pressure applied to the sensor port. however, some changes in static line pressure may result in slight stress distortion in the shape of the sensor. these stresses in turn change the calibration response of the sensor, affecting the zero and span of the sensor. the new generation of sensors is designed to significantly reduce the strain on the sensing components caused by static pressure. look for sensors with a rated low voltage effect.
fifth, response time
differential pressure sensor response time is another important factor, especially for pressure control and wind tunnel applications. the response time of the sensor (the time interval from the response of the sensor to the generation of the output signal) is primarily determined by the technology and electronics used by the sensor sensing element. diaphragms using capacitive sensing technology typically respond very quickly. they detect and measure pressure through voltage changes across the sensing capacitor, and one plate of the capacitor is a diaphragm that reflects a slight change in applied pressure. the resulting change in capacitance is detected by the sensor's electronic components, which are linearized, thermally compensated, and modulated to output a proportional high level signal.
红包扫雷10元7包数字算几率 the need for a fast response time for a differential pressure sensor depends on the application. for example, in wind tunnel applications that measure dynamic airflow velocity changes, the sensor's signal output varies with wind speed and therefore requires fast response times. for most test stands, leak detection and wind tunnel applications, a response time of 10-80 mm is usually acceptable. for conventional processing and monitoring applications where response time is less important, the response time is typically a few seconds instead of a few milliseconds. when designing a system, it is important to understand the response time requirements of the pressure sensor, not always as fast as possible. if the sensor responds too quickly, sometimes the fast sensor responds to brief unfiltered and unwanted system noise or turbulent pressure fluctuations. in this case, filtering the output signal can attenuate these unwanted interferences.