Sapphire high-temperature differential pressure sensor transmitter works and advantages
The sapphire high-temperature differential pressure sensor is a strain-resistance working principle, using silicon-sapphire as a semiconductor pressure sensitive element, and has good metering characteristics. Sapphire is composed of single-crystal insulator elements and generally does not suffer from hysteresis, fatigue, and creep; sapphire is stronger than silicon, has higher hardness, and is not afraid of deformation; sapphire has very good elasticity and insulation properties (within 1000 °C), therefore, The use of silicon-sapphire semiconductor pressure sensitive components, insensitive to temperature changes, even at high temperatures, the pressure sensor also has a good working characteristics; sapphire's radiation resistance is better; In addition, silicon - sapphire semiconductor pressure sensitive components No pn drift, therefore, radically simplifies the manufacturing process, improves repeatability, and ensures high yields.
High-temperature differential pressure sensors manufactured using silicon-sapphire semiconductor sensing elements can operate normally in the harshest operating conditions, and have high reliability, accuracy, and minimal temperature error, but generally have low cost performance. It should be particularly pointed out that such high temperature pressure sensors generally need to be imported exclusively from Russia and face certain risks in after-sales service.
Sapphire differential pressure sensor consists of two diaphragms: titanium alloy diaphragm and titanium alloy diaphragm. The sapphire sheet printed with the heteroepitaxial strain-sensitive bridge circuit was welded on the titanium alloy measurement diaphragm. The measured pressure is transmitted to the receiving diaphragm (the receiving diaphragm and the measuring diaphragm are firmly connected together by a pull rod). Under the effect of pressure, the titanium alloy receives the deformation of the diaphragm. After the deformation is perceived by the silicon-sapphire sensor, the output of the bridge will change, and the amplitude of the change is proportional to the measured pressure.
The circuit of the sapphire high-temperature differential pressure sensor ensures the power supply of the strain bridge circuit and converts the unbalanced signal of the strain bridge into an industry-standard electrical signal output (for example, 4-20 mA signal). In the absolute pressure sensor and transmitter, the sapphire sheet is connected with the solder of the ceramic base glass and functions as an elastic element, converting the measured pressure into strain gauge deformation, thereby achieving the purpose of pressure measurement.