High Airflow Versions Zephyr Sensor

04 January 2013

Honeywell has expanded its HAF series Zephyr airflow sensor 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 new Zephyr airflow sensors offer customers three important benefits:

1. 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.

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

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

These new airflow sensors are designed to function in a wide range of applications. Potential medical applications include anesthesia delivery machines, laparoscopy, patient monitoring systems, spirometers, ventilators and ventricular assist devices (heart pumps). Potential industrial applications include air-to-fuel ratio, analytical instrumentation, fuel cells, fume hoods, gas leak detection, and gas meters.

When using the Zephyr building block, the customer needs to ensure that the air is laminarised when it enters the bypass, and does this through the use of the bypass shape, filters, screens, etc. With the new Honeywell Zephyr airflow sensor, the sensor is directly in the main flow channel and the bypass is optimized inside the sensor.

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