Application: Model 1151 pressure transmitters are available in various types and can be used for differential pressure, flow, gauge pressure, absolute pressure, vacuum, liquid level and density measurement occasions. Determine the model of the transmitter according to the ordering information table, specify such as pressure range, output mode and basic structural material of the transmitter. In addition, options such as accessories, certifications, special manufacturing procedures, etc. can be selected. Working principle: During operation, the isolation diaphragms and tank filling liquid on the high and low pressure sides transmit the process pressure to the central tank filling liquid, and the central tank filling liquid transmits the pressure to the sensing diaphragm in the center of the delta-chamber sensor. The sensing diaphragm is a tense elastic element whose displacement varies with the differential pressure experienced (for GP gauge pressure transmitters, atmospheric pressure acts as if it were applied to the low pressure side of the sensing diaphragm). AP absolute pressure transmitter, the low pressure side always maintains a reference pressure. The maximum displacement of the sensing diaphragm is 0.004 inches (0.10 mm), and the displacement is proportional to the pressure. The capacitive plates on both sides detect the sensing diaphragm. The capacitance difference between the sensing diaphragm and the capacitive plate is converted into the corresponding current, voltage or digital HARTR (High Speed Addressable Remote Transmitter Data Highway) output signal. Circuit board module (intelligent type): The transmitter circuit board module adopts application-specific integrated circuit and surface packaging technology. After the circuit block receives the digital signal and correction coefficient from the sensor membrane head, it corrects and linearizes the signal. The output part of the circuit board module converts the digital signal into an analog signal output, and can communicate with the HART hand-held communicator. Data configuration (intelligent): Configuration data is stored in permanent EEPROM memory on the transmitter circuit board. The data of the transmitter can still be saved when the transmitter is powered off, so the transmitter can work as soon as it is powered on. D/A conversion and signal transmission (intelligent type): Process variables are stored as digital data, which can be accurately corrected and converted into engineering units, after which the corrected data is converted into an analog output signal. The HART Communicator can directly access the digital signal of the sensor without digital/analog conversion to achieve higher precision. Communication mode (intelligent): Model 1151 intelligent pressure transmitter adopts HART protocol communication, which adopts the industrial standard Bell202 frequency shift keying (FSK) technology to superimpose a high frequency signal on the current output signal to realize remote communication. This technology used by SEI can communicate and output at the same time without affecting the consistency of the loop. Software features: The HART protocol makes it easy for users to configure, test and set up the 1151 Smart Pressure Transmitter.
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