| Customization: | Available |
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| Measuring Range: | -0.1-0--40MPa |
| Type: | Digital Display |
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Working principle
The AO910 series diffusion silicon pressure sensor series is a new generation of measuring components produced using imported chips, carefully designed for structure, signal processing, and assembly, and tested according to national and enterprise standards. The basic principle is to use the piezoresistive effect of semiconductors and micro mechanical processing technology to fabricate a Wheatstone bridge on a specific crystal direction of a single crystal silicon wafer using semiconductor processes such as photolithography and diffusion, forming a sensitive membrane. When subjected to external forces, micro strain is generated, the resistivity changes, and the bridge arm resistance changes (one pair increases and one pair decreases). The excitation voltage signal is output, and after computer temperature compensation, laser resistance adjustment, signal amplification and other processing methods, as well as strict assembly inspection, calibration and other processes, a pressure transmitter with standard output signals is produced.
Characteristics
1. Stable output with high sensitivity
The output of a typical strain gauge sensor is only about 10mv, while the full-scale output of a diffusion silicon sensor is about 100mv. The interference and noise factors have relatively small effects, and the cost of the amplification circuit is correspondingly reduced, greatly improving the resolution. There is no dead zone near zero pressure.
2. High precision and good repeatability
The diffusion silicon piezoresistive pressure sensor realizes pressure sensing, pressure transmission force and electrical conversion through the same component, without intermediate conversion links, pressure hysteresis, mechanical displacement deformation, ensuring minimal repeatability and hysteresis error, good linearity, no creep, stability, reliability, and long service life.
3. Good temperature characteristics
Due to the use of advanced technologies such as laser resistance adjustment and computer compensation, as well as clever control of diffusion concentration, full range temperature drift (sensitivity temperature coefficient) self compensation is achieved. Overcoming the defect of high temperature coefficient in semiconductor chips, the zero position and full temperature drift of the transmitter have reached a high level, expanding the operating temperature range.
4. Suitable for applications in hazardous and explosive fields and locations
The diffusion silicon pressure sensor and transmitter have the characteristics of low current, low voltage, and low power consumption, and belong to the intrinsic safety explosion-proof product. They have obtained the explosion-proof certificate issued by the national safety explosion-proof organization.
5. High reliability and anti-interference performance
Due to the use of stainless steel material and special protective structure, as well as a series of protective measures such as lightning protection, anti-interference, overvoltage, and overcurrent for amplification circuits, the product has improved its reliable sealing, anti-corrosion, and resistance to harsh working environments, making it fully suitable for the needs of general industrial field measurement and control.
1. Technical indicators
Object of use: liquid, gas, or vapor
Measurement range gauge pressure: 0-5KPa~3.5MPa, sealing gauge pressure: 0-7MPa~100MPa
Absolute pressure: 0-20KPa~35MPa, negative pressure:- 0.1MPa~2MPa
Output 4-20mADC
Power supply 12-36VDC
Load characteristics 4-20mADC two-wire system
Temperature range -40 ºC~+85 ºC
The shell protection is better than IP65
Explosion-proof type: explosion-proof type d 2 CT6; For the intrinsically safe type IA 2 CT6, an external safety barrier should be installed.
2. Performance indicators
Comprehensive precision accuracy level: 0.1%, 0.2%
Stability better than ± 0.25% FS/3 years
Temperature impact within the range of -10 ºC to+60 ºC: variation less than ± 0.1%/10 ºC (0.1 level)
Change less than ± 0.15%/10 ºC (0.2 level)
-30 ºC~-10 ºC, 60 ºC~+85 ºC: variation less than ± 0.15%/10 ºC (0.1 level)
Change less than ± 0.20%/10 ºC (0.2 level)
When the vibration frequency is 20-200Hz in any direction, the variation is less than ± 0.02% BFSL
| accuracy | ±0.1%,±0.2%,±0.5%,±1% |
| Absolute pressure | 0~35MPa each interval |
| gage pressure | -100KPa~100MPa each interval |
| negative pressure | -100KPa~2MPa each interval |
| medium | Liquids, gases, vapors |
| temperature | -40.0~85ºC (direct), the extension range can be extended by adding accessories such as pressure guiding tube, condensing bend and condenser |
| protect | Better than IP65 |
| stability | Better than ±0.25%FS/3 years |
| Vibration effects | At 20~200Hz in any direction, the variation is less than ±0.02%BFSL |
| shock effect | When the 100G impact is 11ms in any direction, the change is less than ±0.02%BFSL |
| Load impact | As long as the terminal voltage of the transmitter is greater than 12VDC |
| Production options | No oil, no water, no oil, no fat |
| explosion-proof | ExiallCT6 Intrinsically safe, ExdIICT6 Flameproof |
| Power Supply Voltage | 12~36VDC, two-wire system |
| signal | Two-wire 4~20mA, HART |
| SIL attestation | NO.OP181106.FAFQD24 |
| CPA | CPA Minliang Machine 846 (Fujian Provincial Bureau of Quality and Technical Supervision) |
| conformity certificate of protection [of electrical apparatus for explosive atmospheres] | CNEX18.5290X |
Founded in 2007, Fujian Aotai Automation Equipment Co., Ltd. is located in the beautiful Fuzhou, Fujian. It is an enterprise dedicated to providing measurement and control instruments and equipment for "intelligent manufacturing", "smart water" and "smart city". The company's goal is to become an enterprise with advanced technology, professional service and strong competitiveness in the industry. Since its inception, it has been adhering to the concept of "creating a century-old store and establishing a national brand", focusing on the research and development, production, sales and service of instrumentation, and striving to create value for customers.
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