Vibrating wire pressure sensor
The vibrating wire pressure sensor is a frequency-sensitive sensor. This frequency measurement has high accuracy, because time and frequency are physical parameters that can be accurately measured, and the resistance, inductance, and capacitance and other factors. At the same time, the vibrating wire pressure sensor also has strong anti-interference ability, small zero drift, good temperature characteristics, simple structure, high resolution, stable performance, convenient data transmission, processing and storage, and easy to realize instrument digitization, so vibrating wire Type pressure sensor can also be used as one of the development directions of sensing technology.
The sensitive element of the vibrating wire pressure sensor is a tensioned steel string, and the natural frequency of the sensitive element is related to the magnitude of the tensioning force. The length of the string is fixed, and the change of the vibration frequency of the string can be used to measure the magnitude of the pulling force, that is, the input is a force signal, and the output is a frequency signal. The vibrating wire pressure sensor is divided into upper and lower parts, and the lower part is mainly a combination of sensitive elements. The upper component is an aluminum shell, which contains an electronic module and a terminal, which is divided into two compartments, so that the sealing of the electronic module compartment will not be affected during wiring.
The vibrating wire pressure sensor can choose current output type and frequency output type. When the vibrating wire pressure sensor is in operation, the vibrating wire vibrates continuously at its resonant frequency. When the measured pressure changes, the frequency will change. This frequency signal can be converted into a 4~20mA current signal through the converter.