Air flow sensors for respiratory and medical applications

April 26, 2021 // By Peter Clarke
Air flow sensors for respiratory and medical applications
Posifa Technologies Inc. (San Jose, Calif.) has introduced air flow sensors with surface coatings for harsh environments.

The PMF83000 and PMF86000 mass air flow sensors have been enhanced with a paralyne coating over the sensor die and the PCB assembly. This provides an extra level of protection for reliable performance in harsh environments with high humidity and trace amounts of corrosive gases making them suitable for use in respiratory care and other medical and instrumentation applications.

Suitable for use in ventilators, respirators, oxygen concentrators, nebulizers, and CPAP equipment, where they control the volume of air flow to patients. In addition, the devices provide mass flow measurement in anesthesia delivery, fuel cell control, and environmental monitoring equipment.

The sensor die uses a pair of thermopiles to detect changes in temperature gradient caused by mass flow, delivering repeatability of 0.5 percent of full scale.

Measuring flow rates from 15 standard liters per minute [SLM] to 100 SLM and 50 SLM to 300 SLM, respectively, the PMF83000 and PMF86000 series offer response times of 5ms typical and operate over temperature ranges of -25 °C to +65 °C. The devices provide both analog (voltage) and digital I²C outputs in the same package and support bidirectional flow measurement.

Samples and production quantities of the PMF83000 and PMF86000 mass air flow sensors are available

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