Pressure sensors are categorized based on their working principle, application, and the type of pressure they measure. Below are the seven main types of pressure sensors and their characteristics:
1. Absolute Pressure Sensors
- What it measures: Pressure relative to a perfect vacuum (zero reference point).
- Applications:
- Vacuum systems.
- Altitude measurement in aerospace.
- Example:
- Used in the PT600 series, these sensors provide precise measurements where reference to absolute vacuum is critical.
2. Gauge Pressure Sensors
- What it measures: Pressure relative to atmospheric pressure.
- Positive gauge pressure: Above atmospheric pressure.
- Negative gauge pressure: Below atmospheric pressure (vacuum).
- Applications:
- Measuring pressure in pipelines, tanks, and industrial systems.
- HVAC and process control.
- Example:
- The PT03 series offers gauge pressure measurement with a 4–20 mA output, ideal for universal applications.
3. Differential Pressure Sensors
- What it measures: The difference in pressure between two points.
- Applications:
- Monitoring flow rates using orifice plates or Venturi tubes.
- Measuring liquid levels in pressurized tanks.
- Filter monitoring.
- Example:
- The PT600RSH from Pondus Instruments provides high-accuracy differential pressure measurement with integrated overload protection.
4. Sealed Pressure Sensors
- What it measures: Pressure relative to a sealed reference point, often equivalent to atmospheric pressure at sea level.
- Applications:
- High-pressure hydraulic systems.
- Subsea equipment.
- Example:
- Sealed sensors are used in harsh environments, ensuring durability against extreme pressures.
5. Vacuum Pressure Sensors
- What it measures: Pressure below atmospheric pressure.
- Applications:
- Semiconductor manufacturing.
- Vacuum pumps and chambers.
- Features:
- Can be integrated into devices that handle high vacuum levels.
6. Multivariable Pressure Sensors
- What it measures: Multiple variables like pressure, temperature, and flow in a single device.
- Applications:
- High-precision process industries.
- Gas flow and energy metering.
- Example:
- Digital pressure transmitters with HART or MODBUS communication, like the PT03RS, integrate temperature measurements alongside pressure.
7. Piezoresistive Pressure Sensors
- What it measures: Pressure based on the resistance change in a piezoresistive material.
- Applications:
- General-purpose industrial and automotive systems.
- Medical devices like blood pressure monitors.
- Features:
- High sensitivity and accuracy.
- Example:
- The PT600 series utilizes piezoresistive technology for reliable pressure sensing in various conditions.
How to Choose the Right Sensor Type
The choice depends on:
- Pressure type: Absolute, gauge, differential, etc.
- Application environment: Temperature, corrosive media, or high pressures.
- Signal output: Analog (4–20 mA) or digital (MODBUS, HART).
Conclusion
Understanding the types of pressure sensors and their applications helps in selecting the right sensor for specific industrial or commercial needs. Whether for differential pressure in filters, absolute pressure in vacuum systems, or gauge pressure in pipelines, Pondus Instruments offers versatile and reliable solutions tailored to your requirements.
For expert assistance in selecting the right pressure sensor, contact Pondus Instruments today!
