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Specifications
Models 8455, 8465, 8475
Accuracy ...........................
Repeatability .....................
Response Time to Flow ...
Common specifications to all models
Field Selectable Velocity Ranges
Model 8455/8465 ........... 0.125 m/s to 1.0, 1.25, 1.50, 2.0, 2.5, 3.0, 4.0, 5.0, 7.5, 10.0,
Model 8475 .................... 0.05 m/s to 0.5, 0.75, 1.00, 1.25, 1.50, 2.0, 2.5 m/s
Minimum Resolution..... 0.07% of selected full scale
Input Power ................... 11-30 VDC or 18-28 VAC, 350 mA max
Output Impedance ........ Voltage mode: less than 1 ohm, 20 mA max source current
Output Resistance ........ Current mode: 500 ohms maximum load resistance
Output Signal
(field selectable) .......... 0-5V, 0-10V, 1-5V, 2-10V, 0-20 mA, 4-20 mA
Output Time
Constant (field
selectable) ................... 0.05 to 10 seconds.
Probe Length ................. 7.5 cm, 15 cm, 21.5 cm or 30 cm (3 in, 6 in, 9 in or 12 in)
Temperature .................. Compensation Range:
1
from 18 to 28°C (64.4 to 82.4°F), outside this range add 0.2% per °C (0.11% per °F),
within temperature compensation range.
2
from 20 to 26°C (68 to 78.8°F), outside this range add 0.5% per °C (0.28% per °F),
within temperature compensation range. Uncertainty increases in downward vertical
flow at velocities less than 0.25 m/s (50 ft/min). Directional sensitivity of the Model
8475 is +5%/-20% of reading +0/-0.05 m/s (+0/-10 ft/min) over 270° solid angle
regardless of flow direction.
3
Standard deviation based on one minute average from 0.5 to 5.0 m/s (100 to 1000
ft/min).
4
For 63% of final value, tested at 7.5 m/s (1000 ft/min).
5
For 63% of final value, tested at 2.5 m/s (500 ft/min).
6
Input voltage must be maintained within specifications at the transducer.
Calibration occurs with sensor oriented horizontally in a horizontal air flow.
8455
±2.0% of reading
±0.5% of full scale
of selected range
<±1.0% of
3
reading
4
0.2 sec
12.5, 15.0, 20.0, 25.0, 30.0, 40.0, 50.0 m/s (25 ft/min to 200,
250, 300, 400, 500, 750, 1000, 1250, 1500, 2000, 2500,
3000, 4000, 5000, 7500, 10000 ft/min)
(10 ft/min to 100, 125, 150, 200, 250, 300, 400, 500 ft/min)
Sensor Operation:
Electronics Operation:
Storage:
21
8465
1
±2.0% of reading
±0.5% of selected
full scale range
<±1.0% of
3
reading
4
0.2 sec
0 to 60°C (32 to 140°F)
0 to 93°C (32 to 200°F)
0 to 93°C (32 to 200°F)
0 to 93°C (32 to 200°F)
8475
1
±3.0% of reading
±1.0% of selected
full scale range
NA
5
5 sec
6
2
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