Differential Pressure Sensors
High Sensitivity at Low Differential Pressures
Sensirion is a leading provider of differential pressure and flow sensor solutions for medical, HVAC, automotive, and industrial applications.
Key Advantages
- Measures differential pressures as low as 0.1 Pa
- No zero drift, no offset
- Calibrated and temperature compensated
- Low unit-to-unit variation for efficient mass production
- Small size, fast response, and high reliability
For more information, visit: www.sensirion.com/differentialpressure
Powered by CMOSens® Technology
All Sensirion differential pressure sensors are based on the innovative CMOSens® technology. This technology integrates the sensor element and analog and digital signal processing circuitry onto a single miniature CMOSens® silicon chip, offering:
- High reliability and long-term stability
- Ultra-high signal-to-noise ratio
- Over 20 years of industry-proven technology
- Low unit-to-unit variation for efficient mass production
- Small size, fast response, and high reliability
Sensirion CMOSens® differential pressure sensors outperform traditional piezoresistive thin-film sensors in low differential pressure sensitivity, offset and hysteresis, as well as position sensitivity, shock resistance, and temperature dependency, based on a thermal flow measurement principle.
Sensirion differential pressure sensors are particularly suitable for measuring standard volumetric flow or mass flow (e.g., using orifice plates or Pitot tubes). While membrane sensors require compensation for air density to determine mass flow, Sensirion differential pressure sensors output a differential pressure that has already compensated for mass flow, making them unaffected by air pressure and temperature variations.
CMOSens® Technology Diagram Description: The technology utilizes a thermal principle. A miniature silicon chip contains a temperature sensor and a heated element. Gas flow passing over the chip creates a temperature difference detected by the sensor. The scale indicates 1 mm.
Performance Graph Description: A graph illustrates the relationship between pressure and flow. Sensirion's flow sensors show a more linear and sensitive response compared to membrane sensors, especially at lower flow rates.
Product Series
Sensirion differential pressure sensors are fully calibrated and temperature compensated, offering superior accuracy, long-term stability, and no zero-point drift, making them ideal for a wide range of applications. The SDP3x and SDP800 series sensors feature a digital I2C interface or analog voltage output. Digital output sensors offer measurement speeds up to 2 kHz, supporting smart averaging algorithms and multiple measurement modes.
Evaluation Kits SEK-SDP31 and SEK-SDP8xx
These evaluation kits allow for easy and cost-effective evaluation of 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 allows data export in Excel format.
SDP3x - Room for Your Ideas
The SDP3x is Sensirion's smallest differential pressure sensor, measuring just 5x8x5 mm, making it ideal for space-constrained applications such as mobile and portable devices. Digital SDP3x sensors offer interrupt output functionality and selectable I2C addresses. Analog voltage output versions are 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 processes like pick-and-place operations.
SDP800 Series - Striving for Perfection
Building on the excellent performance of the SDP600 series, the SDP800 series represents 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 features, measurement speeds up to 2 kHz, and configurable analog voltage output or digital I2C interface. SDP800 sensors are suitable for demanding, cost-sensitive HVAC applications (e.g., VAV controllers and burners) and provide a reliable, advanced solution.
Our Services
- Professional Consulting: 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 in integrating SDP sensors into your application, with proven practices to ensure your production concepts align with Sensirion's gas flow sensors.
- Lifetime Support: Reliable and flexible supply, continuous product innovation planning to meet future needs.
Product Specifications Table
| Feature | SDP31 / SDP36 | SDP32 / SDP37 | SDP800 / SDP806 | SDP810 / SDP816 |
|---|---|---|---|---|
| Pressure Range (Pa) | 500 | 125 | 500 | 125 |
| Pressure Range (in H₂O) | 2" H₂O | 0.5" H₂O | 2" H₂O | 0.5" H₂O |
| Output | I2C | Analog | I2C | Analog |
| Pneumatic Connection | Manifold | Standard Tube | Manifold | Standard Tube |
| Key Performance | Small size, reflow solderable, tape & reel | Robust, high accuracy, analog output | Small size, high performance | Robust, high accuracy, analog output |
| Power Voltage (V) | 3 to 5.5 | |||
| Measurement Accuracy (%) | 3% | |||
| Min Detectable Pressure (Pa) | < 0.02 | < 0.01 | < 0.02 | < 0.01 |
| Measurement Speed (ms) | 0.5 | 5 | 0.5 | 5 |
| Calibration Gas | Air, Nitrogen | Air, Inert Gas | Air, Nitrogen | Air, Inert Gas |
| Compatible Gas | Air, Nitrogen | Air, Inert Gas | Air, Nitrogen | Air, Inert Gas |
Multiple Applications
Medical
- ICU ventilation, respiratory devices
- High-speed measurement
- Robustness, shock resistance
- Calibrated, temperature compensated
Burner Control
- Heating systems, condensing boilers, pellet stoves, fuel cells
- Precise mass air flow control
- Unaffected by altitude and temperature, accurate readings
- Fault/error control versions available
Filter Monitoring
- Intake filters, clean air filters
- Sensitive, precise, and reliable filter monitoring
- Custom smart filter monitoring solutions
VAV Systems and Heat Recovery
- Measure air flow and total energy content for heating and energy optimization
- No drift (no zero point recalibration required)
- Robust and durable
Urban Applications Illustration Description: An illustration depicts various applications in an urban setting, showcasing buildings, infrastructure, and environmental elements, implying the widespread use of Sensirion's technology.
Bypass Flow Measurement
Sensirion bypass differential pressure sensors offer high accuracy, robustness, stable performance, and excellent cost-effectiveness, making them an ideal choice for air flow measurement. In a bypass configuration, the differential pressure sensor is placed across a pressure drop element (like an orifice plate). The airflow in the main channel creates a pressure difference across this element, which is directly proportional to the air flow rate.
Bypass Flow Diagram Description: The diagram shows a main airflow channel containing a pressure drop element. A bypass channel connects the upstream and downstream sides of the pressure drop element, housing the Sensirion differential pressure sensor. The sensor measures the pressure difference, which correlates to the total airflow in the main channel.
For more information, consult the white paper: www.sensirion.com/bypass
