Honeywell Zephyr digital airflow sensors provide what the manufacturer claims to be the industry's most accurate airflow readings over their operating temperature range of –20 to 70 ºC. The HAF series devices provide accurate digital output with a response time of 1 ms, enhanced reliability, and repeatable measurements to fulfil many medical and industrial application requirements.
The sensors can be tailored to specific end-user needs, and their high sensitivity at very low flows enables the presence or absence of air flow to be detected. The high stability of the Zephyr digital airflow sensors reduces errors due to thermal effects and eliminates shifts to provide accurate readings over time, removing the need for system calibration after PCB assembly or periodic recalibration. The low pressure drop reduces noise and system wear in components such as motors and pumps, while the linear sensor output provides a more intuitive signal than the raw output of basic airflow sensors, which can help users reduce production costs and implementation time.
Honeywell Zephyr digital airflow sensors feature an ASIC-based I2C digital interface that eases integration with microprocessors or microcontrollers. The 19.9 x 36 mm footprint enables compact PCB layout, which can reduce production costs and simplify installation in space-restricted applications. The units operate from a supply voltage of 3.3 to 5 V with low power consumption, making them suitable for use in battery-powered and portable applications.
Zephyr digital airflow sensors are designed to measure mass flow of air and other non-corrosive gases at a maximum flow of 10 standard litres per minute. They are available in standard flow ranges and are fully calibrated and temperature compensated. They provide a digital interface for reading airflow over the specified full scale flow range and temperature range, and their thermally isolated heater and temperature sensing elements help provide a fast response to air or gas flow.
Potential medical applications include anaesthesia delivery units, hospital diagnostics (spectrometry and gas chromatography), nebulisers, oxygen concentrators, patient monitoring systems (respiratory monitoring), sleep apnoea instruments, spirometers, ventilators, and ventricular assist devices. Potential industrial applications include air-to-fuel ratio, analytical instrumentation (spectrometry and chromatography), fuel cells, gas leak detection, gas meters, HVAC filters, meteorology equipment, and variable air volume modules in HVAC systems.
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