Pressure Sensors

What are Pressure Sensors?

Pressure sensors are devices that measure the pressure of liquids or gases and convert it into an electrical signal. They are used extensively in industrial automation, medical equipment, automotive engine management, and weather stations. Since each application demands specific accuracy, range, and environmental tolerance, selecting the right sensor is crucial.

Common Pressure Sensor Types

• Piezoresistive sensors: Use a strain gauge on a silicon diaphragm, offering high linearity and sensitivity. Typical ranges from 0-100 mbar to 0-700 bar.
• Capacitive pressure sensors: Measure capacitance change between diaphragm and a fixed plate; excel in low pressure (vacuum, differential) with high stability.
• MEMS pressure sensors: Miniaturized silicon structures; compact, low power, with digital interfaces (I²C/SPI) ideal for hobby and portable devices.
• Strain gauge based sensors: A metal diaphragm with bonded strain gauges, robust for high pressure and harsh environments.

Key Selection Criteria

When choosing a pressure sensor, consider the following:

• Measurement type: Absolute, gauge, or differential. Select the appropriate reference for your system.
• Pressure range: Ensure the sensor's working range and overpressure limit meet your requirements; exceeding can cause permanent damage.
• Output signal: Analog (0-5V, 4-20mA, ratiometric) or digital (I²C, SPI); match with your controller input.
• Environmental conditions: Temperature, humidity, vibration, and chemical exposure affect sensor life. Choose models with suitable IP ratings for industrial use.
• Accuracy and resolution: Compare accuracy classes (e.g., ±0.1% to ±2%) based on your error tolerance.

Pressure sensors easily integrate with platforms like Arduino, Raspberry Pi, and PLCs, making them popular in both educational and professional projects. Browse our category for various types and ranges.