Views: 50 Author: Site Editor Publish Time: 2025-09-26 Origin: Site
1. Pressure Types
Absolute Pressure | Measured relative to a perfect vacuum (zero pressure). |
Gauge Pressure | Measured relative to the current atmospheric pressure. |
Differential Pressure | The difference between two pressures applied to each side of the sensor. |
2. Pressure Sensor Specifications
Pressure Range: The minimum(usually zero) and maximum pressure the sensor can measure accurately. Never exceed the "Proof Pressure" (the maximum pressure without causing damage) and avoid the "Burst Pressure" (the pressure that causes structural failure)!
Full-Scale Span (FSS): The difference between the output signal at the maximum pressure and the output at the minimum pressure.
Accuracy / Error: Often expressed as a percentage of Full-Scale Span (% FSS). It's a combination of several factors:
Non-Linearity: The maximum deviation of the sensor's output from a best-fit straight line.
Hysteresis: The difference in output when the same pressure is approached from a lower pressure vs. a higher pressure.
Non-Repeatability: The sensor's ability to give the same output for the same pressure under identical conditions.
Output Signal:
Analog Voltage (e.g., 0.5-4.5V): Simple to interface with an ADC (Analog-to-Digital Converter). Susceptible to electrical noise over long distances.
Analog Current (e.g., 4-20 mA): The industry standard for long-distance transmission because it is highly resistant to voltage drop and electrical noise.
Digital (e.g., I2C, SPI, UART): Directly readable by microcontrollers (like Arduino, Raspberry Pi). Often includes built-in signal conditioning and calibration. Easier to use but less common in harsh industrial environments.
Supply Voltage (Vcc): The voltage required to power the sensor (e.g., 5V, 3.3V, 24V for 4-20mA loops).
Media Compatibility: Extremely Important! The material of the sensor's diaphragm (e.g., stainless steel, ceramic) must be compatible with the medium (air, water, oil, aggressive chemicals) it will contact. Incompatibility can lead to corrosion, sensor failure, and contamination.
Mechanical Connection: G1/2, G1/4, 7/16-20UNF-2B, G3/8 DIN 3852, M14×1.5, R1/4, NPT 1/4 etc.
Electrical Connection: Flying lead, M12×1 4-pole, DIN43650, Packard Metri 3-pole etc.
By following these guidelines, you can ensure reliable and accurate pressure measurement.
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