Posted in | Pressure Sensors

Differential Pressure Sensor for Spirometry Applications: SP Series

Superior Sensor Technology’s SP Series low-pressure sensor module family uses NimbleSense™ — a proprietary architecture attaining a very high-level dynamic range — to develop the industry’s best-performing Spirometry pressure-sensing device.

This broad dynamic range is perfectly suited to provide accurate near-zero measurements for supporting the demanding functional necessities of the Spirometry market. Now, selectable multiple pressure ranges are supported in a single package. The SP110/SP210 can be user-programmed to full-scale ranges of ± 250, 500, 1 k and 2.5 kPa whereas the SP160 can be programmed to ranges of ± 5, 10, 20 and 40 kPa.

To simplify customer integration efforts considerably, the SP Series family offers a new sensor integration level into the Spirometry market that combines a superior piezoresistive sensing element with DSP, ADC, integrated amplification and processor intelligence. Floating point technology is leveraged by the SP Series to offer an exceptionally accurate digital output.

When this precision is combined with the enhanced zero point and the best positional immunity of the industry, the ultimate in Spirometry system sensing performance is enabled. Performance, system cost and reliability are optimized by the SP Series for the competitive Spirometry market.

Industry Leading Accuracy Performance

The SP Series measures the pressure of dry air and non-aggressive gas with exact precision better than 0.10% of the selected range. It also exhibits an industry-leading Total Error Band, which is usually better than 0.15% FSS.

In addition to industry-leading accuracy and positional insensitivity, the SP Series also include a proprietary Z-Track™ feature that practically eliminates zero errors. Power-on time is another important consideration, and with Z-Track™, warm-up time is substantially decreased, thereby making the SP Series a great choice for time-critical installation applications.

Differential Pressure Sensor for Spirometry Applications: SP Series

Image Credit: Superior Sensor Technology

Additionally, Spirometry devices must function flawlessly in crowded RF environments created by a confluence of wireless transmitters. This RF immunity requirement drives the need for special design effort to be put into the product packaging. This is done to minimize the effects of spurious RF signals on the sensor module performance. The SP Series has undergone proprietary design techniques to enhance the EMI immunity, reducing the influence of close proximity EMI producing devices such as WiFi, Bluetooth and other cellular communication protocols.

Key Features

  • High-performance low-pressure sensor
  • Multi-range with four calibrated ranges for each device
  • 16-bit resolution for each range
  • Ultra-low noise
  • 19-bit effective resolution
  • Highly integrated sensor, ADC and DSP
  • Z-Track™ technology virtually eliminates zero drift
  • Pressure ranges from ± 250 Pa to ± 40 kPa
  • Improved EMI Immunity
  • Best-in-class position insensitivity
  • Output Update Rate of 500 Hz
  • Standard I2C and SPI interface
  • Selectable bandwidth filter from 25 Hz to 250 Hz
  • Precision better than ±0.10% of selected range
  • Total Error Band less than 0.15% FSS 
  • Temperature compensated from 0 °C to 50 °C

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