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Honeywell has introduced the Zephyr digital airflow sensors, which are claimed to deliver an accurate airflow reading across the operating range of the sensor.

The new HAF Series devices provide accurate digital output, enhanced reliability and repeatable measurements to meet many medical and industrial application specifications, according to the company.

The Honeywell Zephyr digital airflow sensors offer: high 2.5 per cent accuracy that allows for very precise airflow measurement; customisation, which allows the sensor to be designed to meet specific end-user needs; high sensitivity at low flows to enable the detection of the presence or absence of airflow in the application; high stability to reduce errors owing to thermal effects and null shift to provide accurate readings over time, often eliminating the need for system calibration after printed circuit board (PCB) mount and periodically over time; low pressure drop, which typically improves patient comfort in medical applications and reduces noise and system wear in components such as motors and pumps; and linear output to provide a more intuitive sensor signal than the raw output of basic airflow sensors, helping customers reduce production costs and implementation time.

The sensors are claimed to simplify the customer’s production requirements thanks to Application Specific Integrated Circuit (ASIC)-based I2C digital output, which facilitates integration to micro-processors or micro-controllers, reducing PCB complexity and component count.

Their small size occupies less space on the PCB, allowing for a smaller PCB, which can reduce production costs and simplify installation in space-restricted applications.

Their low 3.3VDC voltage option and low-power-supply requirements allow for use in battery-powered and portable applications.

The Zephyr digital airflow sensors are designed to measure the mass flow of air and other non-corrosive gases.

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 span 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 machines, hospital diagnostics (spectrometry, gas chromatography), nebulisers, oxygen concentrators, patient monitoring systems (respiratory monitoring), sleep apnea machines, spirometers, ventilators and ventricular assist devices.

Potential industrial applications include air-to-fuel ratio, analytical instrumentation (spectrometry, chromatography), fuel cells, gas leak detection, gas meters, heating, ventilation and air-conditioning (HVAC) filters, meteorology equipment and variable air volume systems on HVAC units.

Honeywell Sensing and Control

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