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Go with the ow of engineering leadership. All airflow sensors
operate on heat transfer — flow and differential pressure.
But Honeywell Sensing and Control (S&C) offers advanced
chip design, manufacturing techniques and microstructure
technology, allowing our microbridge to be notably faster, smaller
and more sensitive. Our silicon chip design is created from a thin-
film, thermally isolated bridge structure, containing both heater
FEATURES
HONEYWELL ZEPHYR
™
AIRFLOW
SENSORS
HAF Series-High Accuracy.
±50 SCCM to ±750 SCCM
Features: Total Error Band (TEB) as low as
±0.25 %FSS • Fast response time
• Wide range of airows • Customizable
flow ranges and configurable package
styles • Full calibration and temperature
compensation • High sensitivity at very
low ows • Linear output • High stability
• Low pressure drop • High 12-bit
resolution (digital), 0.039 %FS resolution
(analog) • Low 3.3 Vdc operating voltage
• ASIC-based I
2
C output compatibility
(digital) • Insensitivity to mounting
orientation • Insensitivity to altitude
• Small size • RoHS-compliant materials
Benets: Total Error Band (TEB) as low
as ±0.25 %FSS allows for precise airflow
measurement, often ideal for demanding
applications with high accuracy
requirements. Fast response time allows
a customer’s application to respond
quickly to airflow change, important in
critical medical (e.g., anesthesia) and
industrial (e.g., fume hood) applications.
Measures mass flow at standard flow
ranges of ±50, ±100, ±200, ±400 or
±750 SCCM, or custom flow ranges,
Airow Sensors
Line Guide
continued on page 5
increasing the options for integrating the
sensor into the application. Customizable
flow ranges and configurable package
styles meet specific end-user needs. 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). High
sensitivity at very low flows provides
for faster response time at the onset or
cessation of ow. Linear output provides
a more intuitive sensor signal than the
raw output of basic airflow sensors,
which can help reduce production costs,
design, and implementation time. 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. High 12-bit resolution (digital)
increases ability to sense small airflow
changes, allowing customers to more
precisely control their application; 0.039
%FS resolution (analog) 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
2
C digital output compatibility
eases integration to microprocessors or
microcontrollers, reducing PCB complexity
and component count. Insensitivity to
mounting orientation allows customer
to position the 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.
Designed for use in medical equipment
such as anesthesia delivery machines,
ventricular assist devices (heart pumps),
hospital diagnostics (spectrometry, gas
chromatography), nebulizers, oxygen
concentrators, sleep apnea machines,
and temperature sensing elements. This provides rapid response
to the air or gas flow and amount and direction, delivering
a proportional output voltage. Amplified versions provide
an enhanced output signal and less external circuitry, while
unamplified versions allow additional external circuit options.
What’s more, a variety of port styles provides greater application
flexibility.
