Overview
Diffused silicon absolute pressure sensors are advanced sensing devices designed to measure pressure relative to a perfect vacuum. They leverage the piezoresistive effect in silicon, where strain causes a change in electrical resistance. These sensors are integral in industries requiring precise pressure monitoring, such as oil and gas, aerospace, and medical technology. Their compact design and high reliability make them suitable for embedded systems and harsh environments. Unlike gauge pressure sensors, absolute pressure sensors account for atmospheric pressure, making them essential for applications like altitude measurement and vacuum systems.
Structure and Working Principle
The sensor consists of a silicon diaphragm with diffused strain gauges, bonded to a stainless steel or ceramic housing. When pressure is applied, the diaphragm deforms, altering the resistance of the strain gauges. This change is converted into an electrical signal (e.g., 4-20 mA or 0-5 V) via a Wheatstone bridge circuit. Advanced models include temperature compensation circuits to minimize drift. The absence of moving parts enhances durability, while the hermetic seal ensures long-term stability. Some variants integrate digital outputs (I2C/SPI) for direct microcontroller interfacing.
Key Features
1. **High Accuracy**: Typically ±0.1% to ±0.5% of full scale, suitable for precision applications. 2. **Wide Operating Range**: Measures from vacuum levels up to 1,000 bar, depending on the model. 3. **Temperature Stability**: Compensated for -40°C to 125°C, critical for outdoor or industrial use. 4. **Robust Construction**: Stainless steel or titanium housings resist corrosion and mechanical stress. 5. **Low Power Consumption**: Ideal for battery-operated devices like portable monitors.
Application Areas
1. **Industrial Automation**: Monitoring hydraulic systems, compressors, and leak detection. 2. **HVAC**: Optimizing airflow and refrigerant pressure in climate control systems. 3. **Medical**: Ventilators, dialysis machines, and sterilizers rely on precise pressure control. 4. **Aerospace**: Altitude sensing and cabin pressure regulation. 5. **Automotive**: Engine manifold pressure measurement and brake system monitoring.
Maintenance and Precautions
Regular calibration is recommended to maintain accuracy, especially in critical applications. Avoid exposing the sensor to pressures beyond its rated range, which can damage the diaphragm. Ensure proper electrical isolation to prevent signal interference. For corrosive environments, select sensors with Hastelloy or gold-plated contacts. Keep connectors clean and dry to avoid signal degradation. Follow the manufacturer’s guidelines for installation to prevent mechanical stress on the sensing element.
B2B Procurement Guide
When sourcing these sensors, prioritize suppliers with ISO 9001 certification to ensure quality. Request datasheets detailing accuracy, response time, and environmental ratings. Bulk orders (50+ units) often attract discounts of 10-20%. Consider lead times—custom configurations may take 4-6 weeks. Evaluate after-sales support, including calibration services. For OEM projects, verify compatibility with your system’s communication protocols (e.g., Modbus, CAN bus).
Related Manufacturers
- 主营：压力变送器、液位变送器、差压变送器、压力传感器、称重传感器、拉压力传感器、液位计、超声波液位计、超声波热量表、流量计、高频动态压力变送器、压力控制器
- 主营：平膜型压力传感器、压力变送器、液位变送器、流量计
- 主营：温湿度、超声波、吸引泵、传感器、气体传感器、pin光电、变送器、气体压力、相机自动、红外光电、控制设备、线性霍尔、石油化工、汽车电子
- 主营：水压气压液压油压、压力变送器、压力仪表、传感器、血压计、控制器、医疗器械、刹车助力、气体压力、刹车压力、真空压力、电动汽车、气体检测仪、电子刹车开关
- 主营：流量计、雷达物位计、压力变送器、温度传感器、在线浊度仪、溶氧仪、PH分析仪、电导率仪、液位计、无纸记录仪、电流变送器、电压变送器、信号隔离器
- 主营：压力传感器、磁阻传感器、位移传感器、液位传感器、气体传感器、加速度传感器、温湿度传感器、流量传感器、超声波传感器、LVDT配套仪表
- 主营：电子罗盘、磁力计、Positronin美商宝西连接器、压力传感器、差压传感器、流量传感器、地磁传感器、磁场传感器、加速度传感器、陀螺仪角速率传感器、倾角传感器、温湿度传感器、真空传感器、气泡传感器、姿态传感器、IMU惯性导航
- 主营：压力变送器、差压变送器、投入式液位计、扩散硅压力变送器、涡街流量计、电磁流量计、金属管浮子流量计、机械式流量开关、质量流量计、超声波流量计、椭圆齿轮流量计、涡轮流量计、磁翻板液位计、雷达液位计、浮球液位计、超声波液位计、液位变送器、温度变送器、分析仪器、安全光栅、安全光幕、气体报警器、热像仪
- 主营：压力传感器、MEAS传感器、MEAS、精量电子、TE泰科
- 主营：无纸记录仪、信号隔离器、涡街流量计、气压传感器公司、电磁流量计、投入式液位计、自动监测设备、水质在线分析仪、联测压力变送器
- 主营：压力传感器、温度传感器、倾角传感器、振动传感器、测距传感器、气体传感器、电参数传感器、智能网关、DTU
- 主营：流量计、电磁流量计、科里奥利流量计、传感器、科式流量计、超声波液位计、雷达液位计、压力变送器、温度变送器、齿轮流量计、涡街流量计、涡轮流量计、磁翻板液位计、差压液位计、气体质量流量计、金属转子流量计、压力开关、音叉液位开关、流量控制器
- 主营：压力传感器、液位传感器、压力变送器、液位变送器
- 主营：温湿度、接收端、水位计、传感器、无线传感器产品、冷媒泄露传感器、触摸屏、隔离器、雷达料、热工表、热电偶、热电阻、变送器、压力表、调节仪、差压测量、温度测量、压力测量、压力变送器、气体探测器、二次显示仪表、超声波液位计、气象站产品、流量计、NB产品
- 主营：测控仪、升降机、摄像头、传感器、保护管、电磁阀、捞渣机、除铁器、测量杆、喷砂机、法兰盘、金属壳、料位开、调节器、起重机、监视仪、控制器、润滑油、核子料、水银料、防雨罩、流量计、碎煤机、铝合金、灰斗料