Using the strain resistance type work principle, the use of silicon - sapphire as semiconductor sensitive elements, with unparalleled measurement properties.
Sapphire is composed of single crystal dielectric element, not happen lag, fatigue and creep phenomenon; Sapphire is strong than silicon, higher hardness, not afraid of deformation; Sapphire has a very good elasticity and insulating properties (1000 OC), therefore, the use of silicon - sapphire manufacturing semiconductor sensitive element, is not sensitive to temperature changes, even under the condition of high temperature, also has a very good job characteristics; Radiation characteristics of sapphire is extremely strong; In addition, silicon - sapphire semiconductor sensitive element, no p-n drift, therefore, fundamentally simplifies the manufacturing process, improve the repeatability, ensure the high yield.
Made of silicon, sapphire semiconductor sensitive element pressure sensor and transmitter, can work normally under the most extreme working conditions, little error and high reliability, good precision and temperature, high cost performance.
Gauge pressure sensor and transmitter consists of double diaphragm: receive diaphragm measuring diaphragm titanium alloy and titanium alloy. Printing a heterogeneous extensionality sensitive strain of the bridge circuit sapphire wafer, by welding on the titanium alloy measuring
diaphragm. Delivered to the recipient in measured pressure on the diaphragm (receiving diaphragm and diaphragm between measured in rod solid together). Under the action of stress, the titanium alloy receives diaphragm deformation, the deformation by silicon - sapphire sensitive element after perception, the bridge output changes, changes of the amplitude is proportional to the measured pressure.
Sensor circuit can guarantee the strain of the bridge circuit power supply, and the imbalance of strain bridge signal is converted into a unified signal output (0 to 5, 4-20 ma, or 0 to 5 v). In absolute pressure sensor and transmitter, sapphire wafer, glass and ceramic base solder together, have the effect of the elastic element, converts measured stress to the strain deformation, so as to achieve the purpose of pressure measurement.
