6sensing.honeywell.com
Honeywell ZephyrTM Digital Airflow Sensors
HAF Series–High Accuracy
CAUTION
IMPROPER USE
Do not use these products to sense liquid flow.
Failure to comply with these instructions may result in
product damage.
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
1Absolute 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.
CAUTION
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
Operating temperature range -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
Null accuracy 0.1 %FS S 4, 6
Response time 1 ms typ. 7
Resolution 12 bit min. —
Start-up time 17 ms 8
Warm-up time 30 ms 9
Calibration media gaseous nitrogen 10
Bus standards I2C fast mode (up to 400 kHz) 11
Null stability Null will not deviate beyond the specified TEB. —
Reverse polarity protection no —
1Maximum 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.
2Custom and extended compensated temperature ranges are possible. Contact Honeywell for details.
3Accuracy: 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.
4Full 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).
5Total 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.
6Null 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.
7Response 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).
8Start-up time: The time to first valid reading of serial number proceeding streaming 14-bit flow measurements.
9Warm-up time: The time to the first valid flow measurement after power is applied.
10Default calibration media is dry nitrogen gas. Please contact Honeywell for other calibration options.
11Refer to the Technical Note “I2C Communications with Honeywell Digital Airflow Sensors” for I2C protocol information.