The LABOM intelligent differential pressure transmitter uses high-precision silicon sensors as its core, combined with advanced digital signal processing technology, to achieve high-precision and intelligent differential pressure measurement. Its working principle can be divided into three key steps: sensor perception, signal conversion, and digital processing:
High precision silicon sensor senses differential pressure
Silicon sensors adopt the principle of piezoresistive effect and integrate diffusion resistors on single crystal silicon membranes through micro machining technology. When differential pressure acts on the membrane, the membrane undergoes slight deformation, causing a change in the resistance value of the diffusion resistor. The LABOM sensor adopts a fully welded dual chamber system, filled with silicone oil as the pressure transmission medium to ensure that the pressure signal is transmitted to the silicon diaphragm without damage. Its design allows the smallest nominal size diaphragm to be used at low pressure, with minimal temperature error. The range covers 16mbar to 16bar, with an accuracy of ± 0.2% and long-term stability better than 0.1% per year.
Signal Conversion and Preprocessing
The weak resistance change output by the sensor is converted into a voltage signal through a Wheatstone bridge, which is proportional to the input differential pressure. The LABOM transmitter adopts a modular design, separating the sensor module from the amplification module, and digitizing the analog voltage signal through an adapter to avoid signal attenuation during long-distance transmission. The digital signal enters the amplifier for gain adjustment and is converted into a standard 4-20mA current signal output. It supports multiple output modes such as 0-10VDC and RS485 to meet the needs of different industrial scenarios.
Digital Signal Processing and Intelligent Function Implementation
The built-in microprocessor performs real-time processing of digital signals, including nonlinear compensation, temperature drift correction, range adjustment, etc. Through the HART protocol or fieldbus technology, users can remotely access the internal parameters of the transmitter to achieve functions such as range selection, calibration, and diagnosis. LABOM transmitters also have self diagnostic capabilities, which can detect sensor faults, electrical interference, and other issues, and output alarm information through display screens or communication interfaces. Its protection level reaches IP67, made of stainless steel material, suitable for harsh industrial environments.