The use of diffused silicon pressure transmitter core as a sensitive part of the built-in processing circuit conversion transmitter mili-voltage single standard voltage, current, frequency signal output, can be directly connected to the computer, controller, and so on. It can be used as a remote signal transmission. The SKC-2100 uses an all-stainless steel construction that achieves a solid-state design with a stainless steel finish, which can be used in harsh environments for a long time. It is widely used in industrial automation equipment, petroleum, chemical, metallurgy, power, control domain. When the silicon monocrystalline material undergoes a very small strain (usually at 400 microstrain) by external force, the electron energy level of the internal atomic structure changes, resulting in a sharp change in the resistivity (G factor mutation). The resistance made with this material is also a great change, this physical effect is called piezoresistive effect. Using the principle of piezoresistive effect, the use of integrated technology technology through the doping, diffusion, along the characteristics of crystalline silicon wafer, made of strain resistance, constitute the Whistler bridge, the use of silicon material elastic mechanical properties, in the same Silicon material on the anisotropic micro-processing, made a force-sensitive and power conversion detection in one of the diffusion of silicon sensors. To match the sensor with a magnifying circuit and related components, so that the output of a standard signal to form a complete diffusion of silicon pressure transmitter.
Diffused Silicon Pressure Transmitter Options
1, the product range to determine the absolute safety considerations from the product, the general choice of the working pressure value in the standard range of 60% -80% is appropriate, the entire measurement system may occur in the abnormal situation caused by the overload pressure shall not exceed the product allowed Maximum overload. Measurement of dynamic pipeline liquid pressure, should also consider the water drop effect, the appropriate increase in product load, but also to my technical advice.
2, the product selection Product grade by a number of parameters sub-file, the higher the level, the more expensive the price. Users can be based on the requirements of the test conditions and a single parameter accuracy indicators in order to achieve a higher price to achieve higher accuracy requirements. The three indicators of accuracy given by the product are calculated using the international least squares method or the end-based translation method. When the sensor is selected. The accuracy level is determined by the maximum error option assigned to the sensor according to the measurement system. Occasionally, additional errors in the zero drift, zero, and full-scale temperature coefficients should also be taken into account.
3, the choice of sensors, the transmitter According to the nature of their measured pressure, should first determine the choice of gauge pressure (relative to the local atmospheric pressure), differential pressure, absolute pressure or negative pressure varieties. If you measure the level, but also to determine the level above the free atmospheric pressure or sealed container pressure. If you measure the pressure inside the container pressure should be selected differential pressure products.
4, the proliferation of silicon pressure transmitter to choose the use of the product temperature range of products in the factory has been linear temperature compensation. Some of the series of transmitters in the assembly of the circuit after a comprehensive temperature compensation. The compensation range is indicated in the individual product introduction. If the user has special requirements, can consult with my company. For the use of a wide temperature range and requires a high total precision of the user, but also in the secondary instrument data processing software to perform temperature error correction. Exceeding the compensation area, the temperature coefficient indicator may be exceeded, but can still be used. Long-term work in the temperature limit, the product life will be greatly reduced. The user working conditions such as long-term low temperature or ultra-index high temperature area work. Negotiable with my company.
5, differential pressure sensor, the choice of transmitter General differential pressure sensor, the transmitter is usually used in the high pressure side of the pressure is higher than the low pressure side of the pressure difference case, although the diffusion of silicon sensors can also be used for negative pressure, Generally, the two compression terminals are basically symmetrical, but the negative pressure side is generally not calibrated. If the user requires two symmetrical symmetries, it is necessary to inform. Low-voltage side of the system may appear in the over-range range of use, this time with my company consultation.
6, the frequency response characteristics of the proliferation of silicon pressure transmitter relative to the natural frequency of other products is higher, in addition to the more the situation is the sensor structure of the pressure chamber structure parameters and the impact of the sensor structure of the body rigid body size, the latter does not May not limit long, it is mainly cited pressure chamber effect, the user can negotiate with our company to solve the order. 7, with the measured medium matching sensor, transmitter interface and electronic shell by a variety of different structural materials. With different media compatibility, in order to obtain the best use of the results, not due to media mismatch and damage to the product, the user in the selection orders should understand the exact name of the media, concentration, temperature.
Technical features:
1, the accuracy of high diffusion of silicon pressure sensor feel, sensitive conversion and detection of three in one, no mechanical moving parts connected to the conversion link, so the repeatability and hysteresis error is very small. So the comprehensive position accuracy is very high.
2, the reliability of high diffusion of silicon sensitive film elastic deformation in the order of the number of micro-strain, the maximum displacement of the film in the order of microns, and no mechanical wear, no fatigue, no aging. The average time between failures, stable performance, high reliability.
3, the sensitivity of high diffusion of silicon sensitive resistance of the sensitivity factor than the metal strain gauge 50 to 80 times, its full-scale signal output in the 80-100mv or so. The adapter circuit is good fit, the application cost is correspondingly low. Because it is input excitation voltage is low, the output signal is large, and no mechanical moving parts loss, and thus high resolution.
4, high frequency response due to sensitive film silicon material itself inherent frequency is high, generally 50KC. The manufacturing process uses an integrated process, the effective area of the diaphragm can be very small, with a rigid structure pre-installed special design, the sensor frequency response is high, the use of bandwidth up to zero to 100 kHz.
5, the degree of good performance With the integration of technological advances, the proliferation of silicon sensitive film of the four resistance to be further improved, the original manual compensation has been laser resistance, computer automatic rest technology replacement, the sensor zero and sensitivity temperature The coefficient has reached the order of 10-5 / ℃, the working temperature is also greatly improved.
6, the proliferation of silicon pressure transmitter good resistance to electrical breakdown due to the use of special materials and assembly process, the proliferation of silicon sensors can not only do 130 ℃ normal use in the strong magnetic field, high voltage breakdown test can fight 1500V / AC voltage shock pressure transmitter.
7, good corrosion resistance due to the proliferation of silicon material itself excellent chemical corrosion resistance, even if the sensor is not isolated pressure surface, in the ordinary use to adapt to a variety of media. Silicon material and silicone oil has a good compatibility, so that it is used in the use of anti-corrosion material isolation process easier to achieve. Coupled with its low voltage, low current, low power consumption, low cost and intrinsically safe explosion-proof features, can replace many of the same type of functional products, with the best cost performance.
