Honeywell ZephyrTM
Analog Airflow Sensors
HAF Series–High Accuracy
±50 SCCM to ±750 SCCM
Datasheet
Honeywell ZephyrTM Analog Airflow Sensors
HAF Series - High Accuracy
Honeywell Zephyr™ HAF Series sensors provide an analog interface for reading airflow over specified full-scale flow and
compensated temperature ranges. The 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. Standard flow ranges are
available at ±50, ±100, ±200, ±400 or ±750 SCCM. Custom flow ranges are also available. The sensors are fully calibrated
and temperature compensated with an onboard 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 analog
outputs with a response time of 1 ms.
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 carefully designed airflow channel to
provide repeatable response to flow.
Zephyr sensors provide the customer with enhanced reliability, high 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
What makes our sensors better?
Fast response time
Wide range of airflows
Customizable flow ranges and configurable package styles
Linear output
High stability
Low pressure drop
TIGHT TOTAL ERROR BAND • fast response TIME • Wide Range of Airflows
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Features
and Benefits
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.
Wide range of airflows*
Zephyr measures mass flow at standard flow ranges of ±50, ±100 ±200, ±400
or ±750 SCCM, or custom flow ranges, 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).
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.
Low pressure drop*
Typically improves patient comfort in medical applications, and reduces noise and
system wear on other components such as motors and pumps.
0.049 %FS 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.
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.
*Competitive Differentiator
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3
Potential Applications
MEDICAl
Anesthesia Delivery machines
Ventricular Assist Devices (Heart Pumps)
Nebulizers
Oxygen concentrators
Patient monitoring systems (respiratory monitoring)
Sleep apnea machines
Spirometers
Ventilators
LAPAROSCOPY
INDUSTRIAL
AIR-TO-FUEL RATIO
FUEL CELLS
GAS LEAK DETECTION
VAV SYSTEM ON HVAC SYSTEMS
GAS METERS
HVAC FILTERS
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±50 SCCM to ±750 SCCM
Table 1. Absolute Maximum Ratings1
Characteristic
Parameter
Supply voltage
-0.3 Vdc to 6.0 Vdc
Voltage on I/O output pin
-0.3 Vdc to Vsupply
Storage temperature range
-40 °C to 125 °C [-40 °F to 257 °F]
Maximum flow change
5.0 SLPM/s
Maximum common mode pressure
25 psi at 25 °C [77 °F]
Maximum flow
10 SLPM
Absolute maximum ratings are the extreme limits that the device will withstand without damage to the device. However, the electrical and mechanical
characteristics are not guaranteed as the maximum limits (above recommended operating conditions) are approached, nor will the device necessarily operate at
absolute maximum ratings.
1
CAUTION
CAUTION
IMPROPER USE
Do not use these products to sense liquid flow
Failure to comply with these instructions may result in
product damage.
PRODUCT DAMAGE
Do not disassemble these products.
Failure to comply with these instructions may result in
product damage.
Table 2. Operating Specifications
Characteristic
Supply voltage
3.3 Vdc
5.0 Vdc
Power:
3.3 Vdc
5.0 Vdc
Compensated temperature range
Operating temperature range
Parameter
Note
3.3 Vdc ±10%
5.0 Vdc ±10%
–
40 mW max.
65 mW max.
1
0 °C to 50 °C [32 °F to 122 °F]
2
-20 °C to 70 °C [-4 °F to 158 °F]
Accuracy
See Table 3.
3, 4
Total Error Band (TEB)
See Table 3.
4, 5
±0.1 %FSS
4, 6
Null accuracy
Response time
Resolution
Warm-up time
Calibration media
Null stability
Reverse polarity protection
1 ms typ.
7
12 bit
–
15 ms
8
gaseous nitrogen
9
±0.06 %FSS max. deviation from null output after 1000 hrs at 25 °C
–
no
–
Maximum power: Is measured under the conditions of the highest supply voltage, Vsupply + 10%, 70 °C, full scale flow and with the minimum load specified for
that supply voltage.
2
Custom and extended compensated temperature ranges are possible. Contact Honeywell for details.
3
Accuracy: The maximum deviation from the nominal output over the compensated flow range at a reference temperature of 25 °C. Errors include offset, span,
non-linearity, hysteresis and non-repeatability.
4
Full Scale Span (FSS): The algebraic difference between the output at the forward Full Scale (FS) flow and the output at the reverse FS flow. Forward flow is
defined as flow from P1 to P2 as shown in Figure 9. The references to mass flow (SCCM) refer to gas flows at the standard conditions of 0 °C and atmospheric
pressure 760 (101.3 kPa).
5
Total Error Band: The maximum deviation in output from the ideal transfer function over the entire compensated temperature and flow range. Includes all errors
due to offset, full scale span, flow hysteresis, flow repeatability, thermal effect on offset, thermal effect on span and thermal hysteresis.
6
Null accuracy: The maximum deviation in output at 0 SCCM from the ideal transfer function over the compensated temperature range. This includes offset
errors, thermal airflow hysteresis and repeatability errors.
7
Response time: The time to electrically respond to any mass flow change at the microbridge airflow transducer (response time of the transducer may be affected
by the pneumatic interface).
8
Warm-up time: The time to the first valid flow measurement after power is applied.
9
Default calibration media is dry nitrogen gas. Please contact Honeywell for other calibration options.
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Honeywell ZephyrTM Analog Airflow Sensors
HAF Series–High Accuracy
Table 3. Bidirectional Forward Flow Optimization
Accuracy Error Band
Total Error Band
Error (%FSS)
Error (%FSS)
See table below for null accuracy.
See table below for null accuracy.
Sensor
Range
(SCCM)
±50
±100
±200
1
±400
±750
Airflow (SCCM)
Applied Flow
(SCCM)
Error
(%FSS)
Applied Flow
(SCCM)
Error
(%FSS)
-50 to -14.3
±7% reading
-50 to -11.3
±9% reading
-14.3 to 0
±1
-11.1 to 0
±1
00
±0.32
00
±0.32
0 to 20
±1
0 to 11.1
±1
20 to 50
±5% reading
11.1 to 50
±9% reading
-100 to -11.1
±9% reading
-100 to -8.3
±12% reading
-11.1 to 0
±0.5
-8.3 to 0
±0.5
00
±0.16
00
±0.16
0 to 16.7
±0.5
0 to 16.7
±0.5
16.7 to 100
±6% reading
16.7 to 100
±6% reading
-200 to -6.7
±15% reading
-200 to -6.7
±15% reading
-6.7 to -0
±0.25
-6.7 to -0
±0.25
00
±0.1
00
±0.1
0 to 40
±0.25
0 to 22.2
±0.25
40 to 200
±2.5% reading
22.2 to 200
±4.5% reading
-400 to -32
±10% reading
-400 to -32
±12% reading
-32 to -0
±0.4
-32 to -0
±0.45
00
±0.1
00
±0.1
0 to 80
±0.4
0 to 60
±0.45
80 to 400
±4.0% reading
60 to 400
±6% reading
-750 to -25
±15% reading
-750 to -25
±15% reading
-25 to -0
±0.25
-25 to -0
±0.25
00
±0.1
00
±0.1
0 to 37.5
±0.25
0 to 37.5
±0.25
37.5 to 750
±10% reading
37.5 to 750
±10% reading
The short port sensors are only specified down to -100 SCCM.
1
6
Airflow (SCCM)
sensing.honeywell.com
±50 SCCM to ±750 SCCM
Table 4. Suggested Load
Characteristic
Parameter
Minimum suggested resistance:
3.3 Vdc
5.0 Vdc
3.3 kOhm
5 kOhm
Maximum suggested capacitance:
3.3 Vdc
5.0 Vdc
10 nF
10 nF
Parameter
Humidity
Characteristic
0% to 95% RH, non-condensing
Shock
Vibration
ESD
LARGE PARTICULATE DAMAGE
Use a 5-micron filter upstream of the sensor to keep media
flow through the sensor free of condensing moisture and
particulates. Large, high-velocity particles or conductive
particles may damage the sensing element.
Failure to comply with these insturctions may result in
product damage.
Table 6. Wetted Materials
Table 5. Environmental Characteristics
Characteristic
CAUTION
Parameter
Covers
high temperature polymer
100 g, 11 ms
Substrate
PCB
15 g at 20 Hz to 2000 Hz
Adhesives
epoxy
Class 3B per MIL-STD 883G
Electronic
components
silicon, gold
Compliance
RoHS, WEEE
Table 7. Recommended Mounting and Implementation
Characteristic
Parameter
Mounting screw:
size
torque
5-40
0,68 N m [6 in-lb]
Silicon tubing for long port style
70 durometer; size 0.125 in inside diameter, 0.250 in outside diameter silicone tubing
O-ring:
for short port style
for long port style
AS568A, Size 7, Silicone, Shore A 70
AS568A, Size 10, Silicone, Shore A 70
Filter
5-micron filter upstream of the sensor
Figure 2. Nominal Analog Output
Analog Output (%Vsupply)
120.00%
100.00%
80.00%
60.00%
40.00%
20.00%
0.00%
-150.00%
-100.00%
-50.00%
0.00%
50.00%
100.00%
150.00%
Flow (%FS)
sensing.honeywell.com
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Honeywell ZephyrTM Analog Airflow Sensors
HAF Series–High Accuracy
Figure 3. Ideal Transfer Function
F
Vo = Vs 0.5 + 0.4 A
FFS
Where:
VO= output voltage of the device
VS= supply voltage measured at the device
FA = flow applied across the device
FFS = full scale flow specified for the device
F ( V /V -0.5 )
FA = FS o s
0.4
Honeywell ZephyrTM Analog Airflow Sensors, HAF Series-High Accuracy,
±50 SCCM to ±750 SCCM, Product Nomenclature
Figure 4. Nomenclature and Order Guide
For example, a HAFBLF0200CAAX5 part number defines a Honeywell ZephyrTM Analog Airflow Sensor, bidirectional forward flow optimized, long port, fastener
mount, 200 SCCM, analog output, 10% to 90% transfer function, 5.0 Vdc supply voltage.
HAF
B
Flow
Product Series
Direction
HAF Series
Bidirectional
High Accuracy B forward flow
optimized
Airflow Sensor
S
Bidirectional
symmetric
L
F
0200
C
A
A
X
5
Port Style
Housing
Style
Flow Range2
Unit
Output
Format
Transfer
Function
Reserved for
Future Use
Supply
Voltage
L Long port1 F Fastener
mount
S Short port
Snap
S mount1
50 long port
0050 style only
10% to 90% of Full
C SCCM A Analog A Scale Output (FSO) X XXXXX
100 long port
5 5.0 Vdc
0100 style only
0200
0400
0750
3 3.3 Vdc
200 long or
short port
400 long port
style only
750 long port
style only
The Long Port Port Style with the Snap Mount Housing Style is not a valid configuration.
The 200 SCCM Flow Range is available in the Long and Short Port Styles.
1
2
Apart from the general configuration required, other customer-specific requirements are also possible. Please contact Honeywell.
Figure 5. All Available Standard Configurations
LF: Long port, fastener mount
SF: Short port, fastener mount
SS: Short port, snap mount
Notes:
1. The long port style with the snap mount housing style is not a valid configu
2. The 200 SCCM flow range is available in the long and short port styles.
3. Apart from the general configuration required, other customer-specific requ
Please contact Honeywell.
8
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±50 SCCM to ±750 SCCM
Figure 6. Wave Solder Profile
300
Max. temp. = 243 °C
Max. temp. = 205 °C
Temperature (°C)
250
200
Housing temp. (top of device)
Pin temp. (bottom of device)
150
100
50
0
0
20
40
60
80
100
Time (s)
Figure 7. Long Port Style Flow vs Pressure
mbar
inH2O
Pa
-750
-0.2517
-0.1011
-25.17
-550
-0.1499
-0.0602
-14.99
-400
-0.0891
-0.0358
-8.91
-300
-0.0578
-0.0232
-5.78
-200
-0.0321
-0.0129
-3.21
-100
-0.0114
-0.0046
-1.14
-50
-0.0035
-0.0014
-0.35
0
-20
-0.0007
-0.0003
-0.07
0
0.0000
0.0000
0.0000
-0.06
20
0.0007
0.0003
0.07
Pressure Drop (inH2O)
N
Typical Pressure Drop
Flow
(SCCM)
0.12
0.06
-0.12
-750
-600
-450
-300
-150
0
150
300
450
600
750
Flow (SCCM)
50
0.0035
0.0014
0.35
100
0.0014
0.0046
0.14
200
0.0321
0.0129
3.21
300
0.0578
0.0232
5.78
400
0.0891
0.0358
8.91
550
0.1499
0.0602
14.99
750
0.2517
0.1011
25.17
Flow
(SCCM)
mbar
Figure 8. Short Port Style Flow vs Pressure
N
Pressure Drop (inH2O)
0.6
Typical Pressure Drop
inH2O
Pa
-200
-1.1707
-0.470
-117.07
-150
-0.7074
-0.284
-70.74
0.2
-100
-0.3562
-0.143
-35.62
0
-50
-0.1120
-0.045
-11.20
0.4
-0.2
-0.4
-0.6
-200
-150
-100
-50
0
Flow (SCCM)
50
100
150
200
0
0.0000
0.000
0.0000
50
0.1196
0.048
11.96
100
0.3462
0.139
34.62
150
0.7149
0.287
71.49
200
1.2589
0.452
125.89
sensing.honeywell.com
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Honeywell ZephyrTM Analog Airflow Sensors
HAF Series–High Accuracy
Figure 9. Mounting Dimensions (For reference only: mm [in].)
LF: Long port, fastener mount
MODEL NUMBER
LOT CODE
Honeywell Zephyr™
HAFBLFXXXXXXXXX
0x123456789
Mounting Footprint
7(50,1$/6,'(
3,0
[0.12]
2,00 TYP.
[0.079]
1,00
[0.04]
3,50
[0.14]
7,20
[0.28]
36,00
[1.42]
18,00
[0.71]
10,3
[0.40]
10,00
[0.39]
2X DIA. 5,35
[0.21]
6,50
[0.26]
7,20
[0.28]
4X DIA. 0,812
[0.032]
;32576
6(1625)22735,17
9,(:(')5207(50,1$/6,'(
2X DIA. 3,40
[0.134]
19,90
[0.78]
7,20
[0.28]
2X DIA. 3,40
[0.13]
6,35
[0.25]
12,70
[0.50]
28,80
[1.13]
36,00
[1.42]
AIRFLOW DIRECTION, PORT SIDE
SF: Short port, fastener mount
MODEL NUMBER
LOT CODE
Honeywell Zephyr™
HAFBSFXXXXXXXXX
0x123456789
7(50,1$/6,'(
3,0
[0.12]
2,00 TYP.
[0.079]
1 2 3 4
1,00
[0.04]
Mounting Footprint
3,50
[0.14]
7,20
[0.28]
10,3
[0.40]
2,50
[0.10]
6,50
[0.26]
19,90
[0.78]
7,20
[0.28]
2X DIA. 3,40
[0.13]
6,35
[0.25]
36,00
[1.42]
12,70
[0.50]
28,80
[1.13]
AIRFLOW DIRECTION, PORT SIDE
10
sensing.honeywell.com
36,00
[1.42]
18,00
[0.71]
2X DIA. 4,00
[0.16]
7,20
[0.28]
4X DIA. 0,812
[0.032]
;32576
6(1625)22735,17
9,(:(')5207(50,1$/6,'(
2X DIA. 3,40
[0.134]
±50 SCCM to ±750 SCCM
Figure 9. Mounting Dimensions (For reference only: mm [in], continued.)
SS: Short port, snap mount
22,00
[0.87]
MODEL NUMBER
LOT CODE
DIA. 2,30
[0.09]
Honeywell Zephyr™
HAFBSSXXXXXXXXX
0x123456789
7(50,1$/6,'(
3,3
[0.13]
2,00 TYP.
[0.079]
6,50
[0.26]
26,00
[1.02]
1,00
[0.04]
10,40
[0.41]
7,20
[0.28]
Mounting Footprint
4,60
[0.18]
4,80
[0.19]
3,00
[0.12]
1,80
[0.071]
10,3
[0.40]
12,8
[0.50]
4X DIA. 0,812
[0.032]
2X DIA. 2,2 [0.086] THRU
HOLES FOR MOUNTING
22,0
[0.866]
3,80
[0.150]
0,65
[0.026]
4,00
[0.157]
2X 7,20
[0.28]
2X 2,50
[0.098]
;32576
2,50
[0.10]
26,00
[1.024]
6(1625)22735,17
9,(:(')5207(50,1$/6,'(
19,90
[0.78]
6,35
[0.25]
12,70
[0.50]
28,80
[1.13]
AIRFLOW DIRECTION, PORT SIDE
10
Table 8. Pinout
Pin 1
Pin 2
Pin 3
Pin 4
Vout
Vsupply
grground
NC
sensing.honeywell.com
11
ADDITIONAL INFORMATION
The following associated literature is available at sensing.honeywell.com:
• Product line guide
• Product part listing/nomenclature tree
• Product range guide
• Technical Information:
– Gas Media Compatibility and Correction Factors
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 serious injury.
• Installation Instructions
• Application specific information
WARNING
MISUSE OF DOCUMENTATION
•
•
The information presented in this product sheet is for
reference only. Do not use this document as a product
installation guide.
Complete installation, operation, and maintenance
information is provided in the instructions supplied with
each product.
Failure to comply with these instructions could result in
death or serious injury.
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Find out more
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through a worldwide network
of sales offices, representatives
and distributors. For application
assistance, current specifications,
pricing or name of the nearest
Authorized Distributor, contact
your local sales office.
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defective materials and faulty workmanship. Honeywell’s standard
product warranty applies unless agreed to otherwise by Honeywell
in writing; please refer to your order acknowledgement or consult
your local sales office for specific warranty details. If warranted
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While we provide application assistance personally, through our
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Specifications may change without notice. The information we
supply is believed to be accurate and reliable as of this issue;
however, we assume no responsibility for its use.
sensing and control products,
call +1-815-235-6847 or
1-800-537-6945, visit
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