Honeywell Sensing & Control, Golden Valley, MN, announced it has expanded its Zephyr™ airflow sensor HAF Series portfolio with new digital versions that provide airflow ranges of 0 to 20 SLPM (standard liters per minute) and 0 to 200 SLPM. With this new product, Honeywell has leveraged its original Zephyr building block airflow sensor via a bypass to the main flow channel of the sensor, eliminating the need for a customer- designed bypass in equipment such as ventilators. The sensors are configurable and customizable with multiple interface and package options, a variety of flow ranges, and custom calibration. Zephyr airflow sensors with the built-in bypass offer three important benefits:

• High performance: that includes a narrow Total Error Band (the most comprehensive and meaningful measurement that provides the sensor’s true accuracy) of ±4% reading and a high accuracy of ±3.5% reading, allowing for very precise airflow measurement—often ideal for demanding applications with high accuracy requirements.

• Ease of integration: provided by simple electrical interfaces (regulated, compensated, calibrated, linearized) and multiple mechanical configurations (manifold mount, male and female fittings).

• Custom calibration: including forward flow direction and optimized custom calibration for many gases (dry air, helium, argon, nitrogen, nitrous oxide, carbon dioxide), which eliminates the need to implement gas correction factors.

Potential applications include anesthesia delivery machines, laparoscopy, patient monitoring systems, spirometers, ventilators and ventricular assist devices.

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