Sensirion Differential Pressure Sensors
Achieving High Sensitivity at Low Differential Pressures
Introduction
Sensirion offers extensive experience in designing differential pressure and flow sensor solutions for medical technology, HVAC, automotive, and industrial automation. Our differential pressure sensors are ideal for a wide range of demanding applications due to their ability to measure differential pressures as low as 0.1 Pa, featuring no zero-point drift, no offset, calibration, temperature compensation, low unit-to-unit variation for efficient mass production, and small size with fast response and high reliability.
For more information, visit: www.sensirion.com/differentialpressure
CMOSens® Technology: Superior Performance
All Sensirion differential pressure sensors are based on the innovative CMOSens® technology. This technology integrates the sensor element and analog and digital signal processing circuits on a single silicon chip. Key advantages include:
- High reliability and long-term stability
- Ultra-high signal-to-noise ratio
- Over 20 years of industry-proven technology
- Low unit-to-unit variation enabling efficient mass production
- Small size, fast response, and high reliability
Sensirion's differential pressure sensors, based on the thermal flow measurement principle, offer superior performance in low-differential pressure sensitivity, offset and hysteresis, as well as position sensitivity and vibration resistance compared to traditional piezoresistive thin-film sensors.
Sensirion differential pressure sensors are particularly suitable for measuring standard volumetric or mass flow (e.g., with orifice plates or Pitot tubes). While thin-film sensors require compensation for air density to determine mass flow, Sensirion's differential pressure sensors provide mass flow compensated differential pressure output, making them unaffected by air pressure and temperature variations.
Diagram Description: A diagram illustrates the principle of thermal flow measurement. It shows a heated element, a temperature sensor, and the flow of gas. The temperature difference between the heated element and the temperature sensor is measured, which is proportional to the gas flow rate. Another diagram shows a comparison between a Sensirion flow sensor and a thin-film sensor, illustrating the superior performance of the Sensirion sensor in terms of sensitivity and accuracy at low flow rates.
Product Series
Sensirion differential pressure sensors are fully calibrated and temperature-compensated, offering high accuracy, long-term stability, and no zero-point drift, making them ideal for various applications. The SDP3x and SDP800 series sensors are available with a digital I2C interface or analog voltage output. Digital output sensors offer measurement speeds up to 2 kHz and support intelligent averaging algorithms and multiple measurement modes.
Evaluation Kits SEK-SDP31 and SEK-SDP8xx
These evaluation kits provide an easy and cost-effective way to evaluate Sensirion's digital differential pressure sensors. Each kit includes an adapter cable and a differential pressure sensor. The SEK-SensorBridge, required for connecting the sensor to a PC, is not included and must be purchased separately. Software for data logging can be downloaded from the Sensirion website and data can be exported to Excel format.
SDP3x - Room for Your Ideas
The SDP3x is Sensirion's smallest differential pressure sensor, measuring only 5x8x5 mm, making it ideal for space-constrained applications such as mobile and portable devices. The digital SDP3x sensors offer an interrupt output and selectable I2C addresses. The analog voltage output version is freely configurable, allowing switching between bidirectional/unidirectional measurement, fast/slow response times, and different temperature compensation modes. All SDP3x sensors are reflow-solderable and delivered in tape-and-reel packaging, compatible with state-of-the-art assembly technologies like pick-and-place operations.
SDP800 Series - Continuous Improvement
Building on the excellent performance of the SDP600 series, the SDP800 series represents the culmination of Sensirion's 20 years of experience in measuring airflow for millions of patients and millions of automotive engines and HVAC systems. The SDP800 series sensors are small and easily integrated into various applications. The new generation sensor chip offers extended functionality, measurement speeds up to 2 kHz, and configurable analog voltage output or digital I2C interface. The SDP800 sensors are suitable for demanding, cost-sensitive HVAC applications (e.g., VAV controllers and burners) and represent a reliable and advanced solution.
Our Services
- Expert Consultation: Experienced sales team and a global distribution network.
- Product Evaluation: Comprehensive product portfolio, easy-to-use evaluation kits, and technical documentation (datasheets, sample code, application notes).
- Design Support: Assistance with integrating SDP sensors into your applications and proven practices to ensure your production concepts are compatible with Sensirion's airflow sensors.
- Lifetime Support: Reliable and flexible supply, continuous product innovation planning to meet future demands.
Product Comparison Table
| Product | SDP31 | SDP32 | SDP36 | SDP37 | SDP800 | SDP810 | SDP806 | SDP816 |
|---|---|---|---|---|---|---|---|---|
| Pressure Range (Bidirectional) | 125 Pa; 0.5" H₂O | 500 Pa; 2" H₂O | 125 Pa; 0.5" H₂O | 500 Pa; 2" H₂O | 125 Pa; 0.5" H₂O | 500 Pa; 2" H₂O | 125 Pa; 0.5" H₂O | 500 Pa; 2" H₂O |
| Output | I2C | I2C | Analog | Analog | I2C | I2C | Analog | Analog |
| Pneumatic Connection | Manifold | Manifold | Standard Tube | Manifold | Manifold | Manifold | Standard Tube | Manifold |
| Key Performance | Small size, reflow-solderable, tape & reel packaging | Small size, reflow-solderable, tape & reel packaging | Small size, excellent performance | Small size, excellent performance | Robust, high accuracy, analog output | Robust, high accuracy, analog output | Robust, high accuracy, analog output | Robust, high accuracy, analog output |
| Power Supply Voltage | 3 to 5.5 V | 3 to 5.5 V | 3 to 5.5 V | 3 to 5.5 V | 3 to 5.5 V | 3 to 5.5 V | 3 to 5.5 V | 3 to 5.5 V |
| Measurement Accuracy | 3% | 3% | 3% | 3% | 3% | 3% | 3% | 3% |
| Lowest Detectable Pressure | <0.02 Pa | <0.01 Pa | <0.02 Pa | <0.01 Pa | <0.02 Pa | <0.01 Pa | <0.02 Pa | <0.01 Pa |
| Measurement Speed | 0.5 ms | 5 ms | 0.5 ms | 5 ms | 0.5 ms | 5 ms | 0.5 ms | 5 ms |
| Calibration Gas | Air, Nitrogen | Air, Inert Gas | Air, Nitrogen | Air, Inert Gas | Air, Nitrogen | Air, Inert Gas | Air, Nitrogen | Air, Inert Gas |
| Compatible Gases | Air, Nitrogen | Air, Inert Gas | Air, Nitrogen | Air, Inert Gas | Air, Nitrogen | Air, Inert Gas | Air, Nitrogen | Air, Inert Gas |
Diverse Applications
Medical
- Intensive care ventilation, respiratory devices
- High-speed measurements
- Robustness and vibration resistance
- Calibrated and temperature-compensated
Burner Control
- Heating systems, condensing boilers, pellet stoves, fuel cells
- Precise mass air flow control
- Unaffected by altitude and temperature, accurate readings
- Available with fault/error control versions
Filter Monitoring
- Inlet filters, clean air filters
- Sensitive, precise, and reliable filter monitoring
- Sensirion's customized intelligent filter monitoring solutions
VAV Systems and Heat Recovery
- Measurement of air flow and total energy content for heating and energy optimization
- No drift (no zero-point recalibration required)
- Robust and durable
Bypass Flow Measurement
Sensirion bypass differential pressure sensors offer high accuracy, robustness, and stable performance at an excellent cost-effectiveness, making them ideal for air flow measurement. In a bypass configuration, the differential pressure sensor is placed across a pressure drop element (e.g., orifice plate). The main airflow generates a pressure difference across the pressure drop element, which is proportional to the airflow.
Diagram Description: A diagram illustrates a bypass flow measurement setup. It shows a main airflow channel and a smaller bypass channel. A pressure drop element (like an orifice plate) is placed in the main channel. The differential pressure sensor is connected across this element, measuring the pressure difference caused by the airflow. The diagram labels the main channel as 'Main Channel', the bypass channel as 'Bypass Channel', the sensor as 'Sensirion Differential Pressure Sensor', and the pressure drop element as 'Pressure Drop Element'.
For more information, consult the white paper at: www.sensirion.com/bypass
