Air Velocity Sensors Provide Data Center Thermal Management

(Posifa Technologies)

Posifa Technologies’ PAV1000 series air velocity sensors target data center thermal management and HVAC applications such as filter monitoring. Measuring air velocity at 7 m/s (PAV1005V) and 15 m/s (PAV1015V), the devices offer response times of 125 ms typical in a compact, robust package.

The PAV1000 series was designed as an economical, high-performance air velocity sensor for thermal management and filter monitoring in space-constrained locations, such as rack enclosures with air cooling in data centers. Unlike thermistor-based solutions, the Posifa MEMS sensor core is minimally affected by ambient temperature changes and provides instant real-time feedback on proper air flow at critical locations.

The devices feature the company’s third generation thermal flow die, which uses a pair of thermopiles to detect changes in temperature gradient caused by mass flow. The result is a repeatability of 1% FS and accuracy of 5% FS. The solid-state thermal isolation structure on the sensor die eliminates the need for a surface cavity or fragile membrane used in competing technologies, making the sensor resistant to clogging and pressure shock.

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The PAV1000 series offers an output voltage range from 0 to 4.5 Vdc and operates from a supply voltage from 5 to 5.5 Vdc and supply current of 20 mA. The devices operate over a temperature range from -25°C to +85°C. Samples and production quantities of the PAV1000 series air velocity sensors are available now. Further information, checkout the PAV1000 datasheet.

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