Pressure sensors are a vital component in many industries, providing the ability to accurately and reliably measure pressure in various applications. One type ofpressure sensorthat has gained popularity in recent years is the glass micro-melt sensor, which was first developed by theCalifornia Institute of Technologyin 1965.
The glass micro-melt sensor features a high-temperature glass powder sintered onto the back of a 17-4PH low-carbon steel cavity, with the cavity itself made of 17-4PH stainless steel. This design allows for high pressure overload and effective resistance to sudden pressure shocks. Additionally, it can measure fluids that contain a small amount of impurities without the need for oil or isolation diaphragms. The stainless steel construction eliminates the need for O-rings, reducing the risk of temperature release hazards. The sensor can measure up to 600MPa(6000 bar) under high pressure conditions with a maximum high-precision product of 0.075%.
However, measuring small ranges with the glass micro-melt sensor can be challenging, and it is generally only used for measuring ranges above 500 kPa. In applications where high voltage andhigh precision measurementare necessary, the sensor can replace traditional diffused silicon pressure sensors with even greater efficiency.
MEMS (Micro-Electro-Mechanical Systems) technology-based pressure sensors are another type of sensor that has gained popularity in recent years. These sensors are made using micro/nanometer-sized silicon strain gauges, which offer high output sensitivity,stable performance, reliable batch production, and good repeatability.
The glass micro-melt sensor uses advanced technology where the silicon strain gauge is sintered onto the 17-4PH stainless steel elastic body after the glass has melted at temperatures above 500℃. When theelastic bodyundergoescompression deformation, it generates an electrical signal that is amplified by a digital compensation amplification circuit with a microprocessor. The output signal is then subject to intelligent temperature compensation using digital software. During the standard purification production process, the parameters are strictly controlled to avoid the influence of temperature, humidity, andmechanical fatigue. The sensor has ahigh frequency responseand a wide operating temperature range, ensuring long-term stability in harsh industrial environments.
The intelligent temperature compensation circuit divides temperature changes into several units, and the zero position and compensation value for each unit are written into the compensation circuit. During use, these values are written into the analog output path that is affected by temperature, with each temperature point being the “calibration temperature” of the transmitter. The digital circuit of the sensor is carefully designed to handle factors such as frequency, electromagnetic interference, and surge voltage, with strong anti-interference ability, wide power supply range, and polarity protection.
The pressure chamber of the glass micro-melt sensor is made of imported 17-4PH stainless steel, with no O-rings, welds, or leaks. The sensor has anoverload capacityof 300%FS and afailure pressureof 500%FS, making it ideal for high-pressure overload applications. To protect against sudden pressure shocks that may occur in hydraulic systems, the sensor has a built-in damping protection device. It is widely used in heavy industries such asengineering machinery,machine tool industry, metallurgy, chemical industry, power industry, high-purity gas, hydrogen pressure measurement, and agricultural machinery.
Post time: Apr-19-2023