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Capacitive Pressure Transmitter

Capacitive pressure sensor/transducer/transmitter is a commonly used transmitter product. It is mainly composed of three components: load cell sensor (also called pressure sensor), measuring circuit and process connector. It is widely used in many industries. Huaheng Instrument mainly introduces the working principle and structural analysis of the capacitive pressure transmitter, hoping to help users better apply the product. The two pressures of the measured medium pass into the high and low pressure chambers, acting on the isolating diaphragms on both sides of the delta component (ie, the sensitive component), and transmitting to the sides of the measuring diaphragm through the spacer and the filling liquid in the component. . A capacitive pressure transmitter consists of a capacitor consisting of a measuring diaphragm and electrodes on the insulating sheets on both sides. When the pressures on both sides are inconsistent, the measurement diaphragm is displaced, and the displacement is proportional to the pressure difference, so the capacitance on both sides is not equal, and is converted into a signal proportional to the pressure through the oscillation and demodulation links. Capacitive pressure transmitters and capacitive absolute pressure transmitters operate on the same principle as differential pressure transmitters, except that the low pressure chamber pressure is atmospheric or vacuum. The A/D converter of the capacitive pressure transmitter converts the current of the demodulator into a digital signal whose value is used by the microprocessor to determine the input pressure value. The microprocessor controls the operation of the transmitter. In addition, it performs sensor linearization. Reset the measurement range. Engineering unit conversion, damping, square root, sensor trimming and other operations, as well as diagnostic and digital communications. The structure of the capacitive pressure transmitter: The pressure transmitter microprocessor has a 16-byte program RAM and has three 16-bit counters, one of which performs A/D conversion. The D/A converter fine-tunes the data from the microprocessor and the calibrated digital signal, which can be modified by the transmitter software. The data is stored in the EEPROM and remains intact even if the power is turned off. The digital communication line provides the transmitter with a connection interface to an external device such as the Model 205 Smart Communicator or a control system using the HART protocol. This line detects the digital signal superimposed on the 4-20 mA signal and transmits the required information through the loop. The type of communication is the frequency shift keying FSK technology and is based on the BeII202 standard.
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