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• Datasheet
• Analog Airflow Sensor Datasheet
• Medical Applications Note
• Airflow Sensors Line Guide
  
• Installation Instructions
• I²C Communications
• Glossary of Airflow Sensor Terms
• Sensor Line Guide
• Product Training Module
  
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• Anesthesia delivery machines
• Hospital diagnostics
  (spectrometry, gas chromatography)
  
• Nebulizers
  
• Oxygen concentrators
  
• Patient monitoring systems (respiratory monitoring)
  
• Sleep apnea machines
• Spirometers
  
• Ventilators
  
• Ventricular assist devices
  

• Air-to-fuel ratio
  
• Analytical instrumentation (spectrometry, chromatography)
• Fuel cells
• Gas leak detection
• Gas meters
• HVAC filters
• VAV system on HVAC systems
  

The Honeywell Zephyr™ Digital and Analog Airflow Sensors: HAF Series (High Accuracy) provide high sensitivity and accuracy (2.5%) for very precise measurements of airflow (or absence of airflow) and other non-corrosive gases in medical and industrial applications. The HAF Series (High Accuracy) Sensors feature high stability to reduce errors due to thermal effects and null shift to provide accurate readings over time. The high stability often eliminates the need for system calibration after PCB mounting and periodically again over time. The Honeywell Zephyr Digital Airflow Sensors: HAF Series (High Accuracy) offer enhanced reliability, digital accuracy, and repeatable measurements. The combination of rugged housings with a stable substrate makes these sensors extremely robust and the sensors meet ISO 9001 standards. The analog version provides an analog interface for reading airflow over the specified full-scale flow span and temperature range and was designed for users who are either replacing analog legacy parts or who prefer to operate with an analog sensor.

Features and Benefits

• High ±2.5% accuracy allows for very precise airflow measurement, often ideal for demanding applications with high accuracy requirements
  
• Full calibration and temperature compensation typically allow customer to remove additional components associated with signal conditioning from the PCB, reducing PCB size as well as costs often associated with those components (e.g., acquisition, inventory, assembly)
• Customizable for specific end-user needs
• High sensitivity at very low flows allows a customer's application to detect presence or absence of airflow
• High stability reduces errors due to thermal effects and null shift to provide accurate readings over time, often eliminating need for system calibration after PCB mount and periodically over time
• Low pressure drop typically improves patient comfort in medical applications, and reduces noise and system wear on other components such as motors and pumps
• Linear output provides more intuitive sensor signal than the raw output of basic airflow sensors, which can help reduce production costs, design, and implementation time
  
• Fast response time allows a customer's application to respond quickly to airflow change, important in critical medical (i.e., anesthesia) and industrial (i.e., fume hood) applications
• High 12-bit resolution increases ability to sense small airflow changes, allowing customers to more precisely control their application
  
• Low 3.3 Vdc operating voltage option and low power consumption allow for use in battery-driven and other portable applications
  
• ASIC-based I²C digital output compatibility eases integration to microprocessors or microcontrollers, reducing PCB complexity and component count
  
• Bidirectional flow sensing capability eliminates the need for two airflow sensors, helping to reduce production costs and implementation time
  
• Insensitivity to mounting orientation allows customer to position sensor in most optimal point in the system, eliminating concern for positional effects
  
• Insensitivity to altitude eliminates customer-implemented altitude adjustments in the system, easing integration and reducing production costs by not having to purchase additional sensors for altitude adjustments
  
• Small size occupies less space on PCB, allowing easier fit and potentially reducing production costs; PCB size may also be reduced for easier fit into space-constrained applications
  
• RoHS-compliant materials meet Directive 2002/95/EC