Pressure sensor features and a simple working principle

HYDAC pressure sensor is a non-contact high-precision liquid level sensor with excellent performance. The HYDAC pressure sensor's reflection beam is also widened to 20mm but this is still within the range that the laser level sensor can receive. The HYDAC pressure sensor generally uses near-infrared light. The light stream is emitted by another laser beam partially transmitted through the semitransmitting mirror and is processed by the optical system to form a parallel light beam having a certain width to illuminate the object surface. The reflected wave reaches the HYDAC pressure sensor receiving section and is converted into an electrical signal. Because the time from irradiation to acceptance is very short, the emitted laser light is treated with a half mirror. A part is used as a reference reference signal input time HYDAC pressure sensor. Therefore, the sampling circuit is used to expand into nanoseconds, which is convenient for signal processing and time measurement.

The use of a computer to process the data becomes a reliable part of the digital display of the level value of the reuse software to detect the signal, and the analog output signal. Alarm if the measuring system fails. This HYDAC pressure sensor can be used to measure the level of sand-type hot metal in continuous casting equipment in the steel industry. At the same time, it can also be applied to narrow open containers and high-temperature, high-precision liquid level detection. In addition, in recent years, with the development of high technology, digital intelligent HYDAC pressure sensors have been presented, an advanced digital liquid level measurement system. The measurement technology of its parts and the meter of the microprocessor make the liquid level measuring instrument to the control instrument become the all-digital system. The comprehensive performance index and actual measurement accuracy of the digital intelligent liquid level sensor are integrated into one function.

The HYDAC pressure sensor is based on the principle of ultrasonic transmission and reception, measuring the depth of non-contact measurement of liquid. The propagation speed of the ultrasonic wave is relatively constant at a certain temperature. If the speed of the ultrasonic wave is known, the distance from the ultrasonic probe to the liquid surface can be calculated by calculating the time from the transmission of the ultrasonic wave to the reception time. The depth of the tank or the height of the tank is certain. The distance from the liquid surface to the probe is calculated, and the distance from the liquid surface to the bottom of the tank or the bottom of the tank is also calculated, that is, the depth of the liquid. Its advantages are non-contact measurement, relatively hygienic, and it can detect highly corrosive media. The disadvantage is that the reception of ultrasonic waves has a relatively high requirement for the environment, and in the case of a relatively harsh environment, the ultrasonic liquid level sensor is not applicable.

The basic principle of light emphasizing in the HYDAC pressure sensor can be briefly described as the light intensity change caused by the measured object to realize the detection of the measured object.

The working principle of this HYDAC pressure sensor is that when the diaphragm senses the measured pressure, it bends, so that the air gap between the prism and the light absorbing layer changes, causing partial destruction of the total internal reflection at the prism interface, resulting in a part The light exits the upper interface of the prism, and the absorption layer is absorbed and absorbed, so that the intensity of the reflected light in the fiber will change. The absorption of light intensity can be detected by a bridge light receiver.

Since the diaphragm bends inward under the influence of pressure, the air gap between the optical fiber and the diaphragm is reduced, so the illumination area of ​​the transmitting fiber on the inner surface of the diaphragm is also reduced, but the intensity of light reflected by the receiving optical fiber is reduced. The output signal weakens. The size of the sensor output signal is only related to the distance between the fiber optic patch and the shape of the diaphragm.

The response frequency of the HYDAC pressure sensor is quite high. For example, a stainless steel diaphragm with a diameter of 2mm and a thickness of 0.65mm can have a natural frequency of 138kHz. Therefore, it is also an ideal sensor in dynamic pressure measurement.

HYDAC pressure sensors have a wide range of applications in the industry. Compared with other pressure sensors, it has advantages of no electromagnetic interference, fast response, small size, light weight, good heat resistance, etc. Since there is no conductive element, it is particularly suitable for use in explosion-proof applications.