Honeywell ZephyrTM Digital Airflow Sensors HAF Series-High Accuracy 50 SCCM to 750 SCCM Datasheet Honeywell ZephyrTM Digital Airflow Sensors HAF Series - High Accuracy Honeywell ZephyrTM HAF Series sensors provide a digital 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 digital (I2C) 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 2 sensing.honeywell.com Features and Benefits Total Error Band (TEB) As low as 0.25%FSS* Allows for precise airflow measurement, often ideal for demanding applications with high accuracy requirements. All Possible Errors Offset + Full Scale Span + Linearity = Accuracy + Flow Hysteresis + = Total Error Band Repeatability + Temperature Offset + Temperature Span + Thermal Hysteresis Figure 1. Total Error Band vs. Accuracy Other airflow sensor manufacturers only report on accuracy, while Honeywell reports Total Error Band. 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). *Competitive Differentiator sensing.honeywell.com 3 Features and Benefits 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. 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. 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. 4 sensing.honeywell.com *Competitive Differentiator 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 sensing.honeywell.com 5 Honeywell ZephyrTM Digital Airflow Sensors HAF Series-High Accuracy 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 Parameter Notes Supply voltage 3.3 Vdc 5.0 Vdc 3.3 Vdc 10% 5.0 Vdc 10% -- Power: 3.3 Vdc 5.0 Vdc 40 mW max. 65 mW max. 1 Compensated temperature range 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 Operating temperature range Null accuracy Response time 1 ms typ. 7 Resolution 12 bit min. -- Start-up time 17 ms 8 Warm-up time 30 ms 9 gaseous nitrogen 10 Calibration media Bus standards Null stability Reverse polarity protection 2 I C fast mode (up to 400 kHz) 11 Null will not deviate beyond the specified TEB. -- no -- Maximum Power: Is measured under the conditions of the highest supply voltage Vsupply + 10%, 70 C, full scale flow and with the minimum pull-up resistors for SDA and SCL according to the I2C specification. 2 Custom and extended compensated temperature ranges are possible. Contact Honeywell for details. 3 Accuracy: The maximum deviation from the nominal digital 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 digital output at the forward Full Scale (FS) flow and the digital output at the reverse FS flow. Forward flow is defined as flow from P1 to P2 as shown in Figure 4. 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 (TEB): The maximum deviation in output from 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 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 Start-up time: The time to first valid reading of serial number proceeding streaming 14-bit flow measurements. 9 Warm-up time: The time to the first valid flow measurement after power is applied. 10 Default calibration media is dry nitrogen gas. Please contact Honeywell for other calibration options. 11 Refer to the Technical Note "I2C Communications with Honeywell Digital Airflow Sensors" for I2C protocol information. 1 6 sensing.honeywell.com 50 SCCM to 750 SCCM 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) Airflow (SCCM) Applied Flow (SCCM) Accuracy Error (%FSS) Applied Flow (SCCM) TEB (%FSS) -50 to -16.7 6% reading -50 to -14.3 7% reading -16.7 to 0 1 -14.3 to 0 1 00 0.16 00 0.16 0 to 20 1 0 to 14.3 1 20 to 50 5% reading -14.3 to 50 7% reading -100 to -14.3 7% reading -100 to -14.3 7% reading -14.3 to 0 0.5 -14.3 to 0 0.5 00 0.12 00 0.12 20 0.5 0 to 16.7 0.5 20 to 100 5% reading 16.7 to 100 6% reading -200 to -11.1 9% reading -200 to -11.1 9% reading) -11.1 to -0 0.25 -11.1 to -0 0.25 00 0.01 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 -26.7 9% reading -400 to -32 10% reading -26.7 to -0 0.3 -32 to -0 0.4 00 0.1 00 0.1 0 to 68.6 0.3 0 to 71.1 0.4 68.6 to 400 3.5% reading 71.1 to 400 4.5% reading -750 to -31.3 12% reading -750 to -31.25 12% reading -31.3 to -0 0.25 -31.25 to -0 0.25 00 0.1 00 0.1 0 to 68.2 0.25 0 to 50 0.25 68.2 to 750 5.5% reading 50 to 750 7.5 reading The short port sensors are only specified down to -100 SCCM. 1 sensing.honeywell.com 7 Honeywell ZephyrTM Digital Airflow Sensors HAF Series-High Accuracy CAUTION 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 instructions may result in product damage. Table 5. Wetted Materials Table 4. Environmental Characteristics Characteristic Characteristic Parameter Humidity 0% to 95% RH, non-condensing ESD high temperature polymer 100 g, 11 ms Substrate PCB 15 g at 20 Hz to 2000 Hz Adhesives epoxy Shock Vibration Covers Parameter Class 3B per MIL-STD 883G Electronic components silicon, gold Compliance RoHS, WEEE Table 6. 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 Digital Output (Counts) Figure 2. Nominal Digital Output 18000 16000 14000 12000 10000 8000 6000 4000 2000 0 -2000 -150.00% -100.00% -50.00% 0.00% Flow (%FS) 8 sensing.honeywell.com 50.00% 100.00% 150.00% 50 SCCM to 750 SCCM Figure 3. ideal Transfer Function Digital Output Code = 16384 * [0.5 + 0.4 * (Flow Applied/Full Scale Flow)] Flow Applied = Full Scale Flow * [(Digital Output Code/16384) - 0.5]/0.4 Figure 4. Nomenclature and Order Guide For example, a HAFBLF0200C4AX5 part number defines a Honeywell ZephyrTM Digital Airflow Sensor, bidirectional forward flow optimized, long port, fastener mount, 200 SCCM, I2C output with address 0x49, 10% to 90% transfer function, 5.0 Vdc supply voltage. HAF Product Series HAF Series High Accuracy Airflow Sensor B L F 0200 C 4 A X 5 Flow Direction Port Style Housing Style Flow Range2 Unit Output Format Transfer Function Reserved for Future Use Supply Voltage B Bidirectional L Long port1 X XXXXX 3 3.3 Vdc forward flow optimized S Bidirectional S Short port F Fastener 0050 50 long port mount style only S Snap mount1 0100 0200 symmetric 0400 0750 100 long port style only 200 long or short port 400 long port style only 750 long port style only C SCCM I2C address: 4 Digital 0x49 5 6 7 Digital I C address: 0x59 Digital I2C address: 0x69 Digital I2C address: 0x79 2 A 10% to 90% of Full Scale Output (FSO) 5 5.0 Vdc 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 sensing.honeywell.com 9 Honeywell ZephyrTM Digital Airflow Sensors HAF Series-High Accuracy 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) N Pressure Drop (inH2O) Figure 7. Long Port Style Flow vs Pressure 0.12 0.06 0 -0.06 -0.12 -750 -600 -450 -300 -150 0 150 300 450 600 750 Flow (SCCM) Typical Pressure Drop Flow (SCCM) 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 -20 -0.0007 -0.0003 -0.07 0 0.0000 0.0000 0.0000 20 0.0007 0.0003 0.07 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 0.6 Flow (SCCM) mbar 0.4 -200 0.2 -150 -100 -50 N Pressure Drop (inH2O) Figure 8. Short Port Style Flow vs Pressure 0 -0.2 -0.4 -0.6 -200 -150 -100 -50 0 Flow (SCCM) 10 sensing.honeywell.com 50 100 150 200 Typical Pressure Drop inH2O Pa -1.1707 -0.470 -117.07 -0.7074 -0.284 -70.74 -0.3562 -0.143 -35.62 -0.1120 -0.045 -11.20 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 50 SCCM to 750 SCCM Dlgital Interface For additional details on the use of Zephyr with digital output see the Technical Note "I2C Communications with Honeywell Digital Airflow Sensors". The sensor uses the I2C standard for digital communication with a slave address specified in the Nomenclature and Order Guide in Figure 4. Following sensor power-up, each of the first two read sequences shown in Figure 9 will respond with 2 bytes of the unique 4-byte Serial Number. The first read after power-up will respond with the two most significant bytes of the Serial Number, while the second read will respond with the two least significant bytes of the Serial Number. For reliable performance, allow sensor to be powered for the sensor start-up time before performing the first read, then allow a 10 ms command response time before performing the second read. Figure 9. Sensor I2C Read and Write Sequences I2C Read: Slave responds to Master with data Data Byte 0 (Most Significant) SDA SCL Data Byte 1 (Least Significant) S A6 A5 A4 A3 A2 A1 A0 1 SA D7 D6 D5 D4 D3 D2 D1 D0 MA D7 D6 D5 D4 D3 D2 D1 D0 MN S I2C Read: Master sends data to Slave Command Byte SDA SCL S A6 A5 A4 A3 A2 A1 A0 1 SA D7 D6 D5 D4 D3 D2 D1 D0 MA S Bit Name Description S Start condition Master pulls SDA from high to low while SCL remains high S Stop condition Master allows SDA to float from low to high while SCL remains high Address bit I2C Slave Address is the 7 Most Significant Bits for the first transmitted byte Read/write bit Read = 1, Write = 0 A6 1 D7 Data bit SA Slave ACK Slave pulls SDA low MA Master ACK Master pulls SDA low MN Master NACK Master allows SDA to float high After the power-up read sequence described above, the sensor will respond to each I2C read request with a 16-bit (2 byte) digital flow reading. Read requests taken faster than the Response Time (1 ms) are not guaranteed to return fresh data. The first two bits of each flow reading will be `00'. The maximum sink current on SCL or SDA is 2 mA. Therefore, if the pull-up resistors are biased by VDD, and if VDD reaches the maximum supply voltage of 6 V, then the pull-up resistors for SCL and SDA must be greater than 3.0 k to limit the sink current to 2 mA. The typical value for SCL and SDA pull-up resistors is 4.7 k (this value depends on the bus capacitance and the bus speed). sensing.honeywell.com 11 Honeywell ZephyrTM Digital Airflow Sensors HAF Series-High Accuracy Figure 10. Mounting Dimensions (For reference only: mm [in].) LF: Long port, fastener mount MODEL NUMBER LOT CODE Honeywell ZephyrTM 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 ZephyrTM HAFBSFXXXXXXXXX 0x123456789 7(50,1$/6,'( 3,0 [0.12] 2,00 TYP. [0.079] 1 2 3 4 1,00 [0.04] Mounting Footprint 3,50 [0.14] 7,20 [0.28] 10,3 [0.40] 2,50 [0.10] 6,50 [0.26] 19,90 [0.78] 7,20 [0.28] 2X DIA. 3,40 [0.13] 6,35 [0.25] 36,00 [1.42] 12,70 [0.50] 28,80 [1.13] AIRFLOW DIRECTION, PORT SIDE 12 sensing.honeywell.com 36,00 [1.42] 18,00 [0.71] 2X DIA. 4,00 [0.16] 7,20 [0.28] 4X DIA. 0,812 [0.032] ;32576 6(1625)22735,17 9,(:(')5207(50,1$/6,'( 2X DIA. 3,40 [0.134] 50 SCCM to 750 SCCM Figure 10. 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 ZephyrTM HAFBSSXXXXXXXXX 0x123456789 7(50,1$/6,'( 3,3 [0.13] 2,00 TYP. [0.079] 6,50 [0.26] 26,00 [1.02] 1,00 [0.04] 10,40 [0.41] 7,20 [0.28] Mounting Footprint 4,80 [0.19] 3,00 [0.12] 1,80 [0.071] 10,3 [0.40] 12,8 [0.50] 4X DIA. 0,812 [0.032] 4,60 [0.18] 2X DIA. 2,2 [0.086] THRU HOLES FOR MOUNTING 22,0 [0.866] 3,80 [0.150] 0,65 [0.026] 4,00 [0.157] 2X 7,20 [0.28] 2X 2,50 [0.098] 2,50 [0.10] ;32576 26,00 [1.024] 6(1625)22735,17 9,(:(')5207(50,1$/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 SCL Vsupply ground SDA sensing.honeywell.com 13 ADDITIONAL INFORMATION The following associated literature is available at sensing. honeywell.com: * Product line guide * Product part listing/nomenclature tree * Product range guide 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. * Technical Information: - I2C Communications with Honeywell Digital Airflow WARNING Sensors - Gas Media Compatibility and Correction Factors * Installation instructions MISUSE OF DOCUMENTATION * * Application-specific information * 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. WARRANTY/REMEDY Find out more Honeywell serves its customers 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. To learn more about Honeywell's Honeywell warrants goods of its manufacture as being free of 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 goods are returned to Honeywell during the period of coverage, Honeywell will repair or replace, at its option, without charge those items it finds defective. The foregoing is buyer's sole remedy and is in lieu of all other warranties, expressed or implied, including those of merchantability and fitness for a particular purpose. In no event shall Honeywell be liable for consequential, special, or indirect damages. While we provide application assistance personally, through our literature and the Honeywell website, it is up to the customer to determine the suitability of the product in the application. Specifications may change without notice. The information we supply is believed to be accurate and reliable as of this printing. However, we assume no responsibility for its use. sensing and control products, call +1-815-235-6847 or 1-800-537-6945, visit sensing.honeywell.com, or e-mail inquiries to info.sc@honeywell.com Sensing and Control Honeywell 1985 Douglas Drive North Golden Valley, MN 55422 honeywell.com 32308684-A-EN June 2015 2015 Honeywell International Inc. All rights reserved. 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