HAF HONEYWELL [Honeywell Solid State Electronics Center], HAF Datasheet

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HAF

Manufacturer Part Number
HAF
Description
HONEYWELL ZEPHYR DIGITAL AIRFLOW SENSORS: HAF SERIES-HIGH ACCURACY
Manufacturer
HONEYWELL [Honeywell Solid State Electronics Center]
Datasheet

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DESCRIPTION
Honeywell Zephyr™ Digital Airflow Sensors: HAF Series-High
Accuracy, provide a digital interface for reading airflow over the
specified full scale flow span and temperature range. Their
thermally isolated heater and temperature sensing elements
help these sensors provide a fast response to air or gas flow.
Zephyr sensors are designed to measure mass flow of air and
other non-corrosive gases. They are available in standard flow
ranges and are fully calibrated and temperature compensated
with an on-board Application Specific Integrated Circuit (ASIC).
The HAF Series is compensated over the temperature range of
0 C to 50 C [32 F to 122 F] and operates across a
temperature range of -20 C to 70 C [-4 F to 158 F]. The
state-of-the-art ASIC-based compensation provides digital (I
outputs with a response time of 1 ms.
FEATURES AND BENEFITS (= competitive differentiator)
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
2
C)
These sensors operate on the heat transfer principle to
measure mass airflow. They consist of a microbridge
Microelectronic and Microelectromechanical System (MEMS)
with temperature-sensitive resistors deposited with thin films of
platinum and silicon nitride. The MEMS sensing die is located
in a precise and calculated airflow channel to provide
repeatable flow response.
Zephyr sensors provide customers with enhanced reliability,
digital accuracy, repeatable measurements and the ability to
customize sensor options to meet many specific application
needs. The combination of rugged housings with a stable
substrate makes these products extremely robust. They are
designed and manufactured according to ISO 9001 standards.
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 I
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
2
C digital output compatibility eases integration

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HAF Summary of contents

Page 1

... They are available in standard flow ranges and are fully calibrated and temperature compensated with an on-board Application Specific Integrated Circuit (ASIC). The HAF Series is compensated over the temperature range [ 122 F] and operates across a temperature range 158 F]. The state-of-the-art ASIC-based compensation provides digital (I outputs with a response time ...

Page 2

POTENTIAL APPLICATIONS Medical Anesthesia delivery machines Ventricular assist devices (heart pumps) Hospital diagnostics (spectrometry, gas chromatography) Nebulizers Oxygen concentrators Patient monitoring systems (respiratory monitoring) Sleep apnea machines Spirometers Ventilators Table 1: Absolute Maximum Ratings Characteristic Supply voltage Voltage on ...

Page 3

... Large, high-velocity particles or conductive particles may damage the sensing element. Failure to comply with these instructions may result in product damage. Example Catalog Listing HAFBLS0200C2AX5 = High accuracy airflow sensor, bidirectional forward flow optimized, long port style, snap mount housing, 200 SCCM, digital I ...

Page 4

Figure 2. Nominal Digital Output Figure 3. Accuracy Error Band Figure 5. Long Port Style Flow vs Pressure Figure 6. Short Port Style Flow vs Pressure 4 www.honeywell.com/sensing Ideal Transfer Function Digital Output Code = 16383 * [0.5 + ...

Page 5

Figure 7. Wave Solder Profile 300 250 200 150 100 Figure 8. Mounting Dimensions (For reference only: mm [in]). Additional port and housing styles available. Long Port Style, Fastener Mount MODEL NUMBER LOT CODE TERMINAL SIDE ...

Page 6

WARNING PERSONAL INJURY DO NOT USE these products as safety or emergency stop devices or in any other application where failure of the product could result in personal injury. Failure to comply with these instructions could result in death or ...

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