Air Velocity Transducer

TSI - 8455 - 8465 - 8475

For air velocity measurements in research and development labs, manufacturing processes, and other applications.

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Description

The 8455, 8465, and 8475 Air Velocity Transducers are ideal for both temporary and permanent installations for air velocity measurements in research and development labs, manufacturing processes, and other applications.

The full–scale range, signal output, and time constant are user selectable and can be easily changed to meet the needs of your application.

Applications

• Comfort and draft studies
• Critical environment installations (e.g., clean rooms and hospitals)
• Diffuser design analysis
• Monitoring drying processes
• Monitoring air flows in tunnels and subways
• Used as a standard in wind tunnels and calibration facilities
• Environmental monitoring in greenhouses and IAQ applications
• General engineering applications

General Purpose (8455)

Protected probe tip
Rugged ceramic sensor
Wide range of measurement applications
Fast response time
Windowless (8465)
Less flow blockage
Ideal for measuring in confined spaces
Fast response time
Omnidirectional (8475)
Omnidirectional probe tip
Accurate at low velocities from 10 to 100 ft/min (0.05 to 0.5 m/s)
Ideal for unknown or varying flow direction

8455
8465
8475

Specifications - Models 8455, 8465, 8475

Temperature Range

Probe length

All models contain on-board electronics and calibration curves that provide a linear signal output. This linear signal is sent out as either a current (mA) or a voltage (V) signal, allowing output to a variety of data loggers or data acquisition systems. In addition, the current and voltage output ranges are user-selectable for your convenience.
Accuracy
8455 ±2.0% of reading¹, ±0.5% of full scale of selected range 8465 ±2.0% of reading¹, ±0.5% of full scale of selected range 8475 ±3.0% of reading², ±1.0% of full scale of selected range
Field Selectable Range
8455 and 8465	25 ft/min to 200, 250, 300, 400, 500, 750, 1,000, 1,250, 1,500, 2,000, 2,500, 3,000, 4,000, 5,000, 7,500, 10,000 ft/min (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, 12.5, 15.0, 20.0, 25.0, 30.0, 40.0, 50.0 m/s)
8475	10 ft/min to 100, 125, 150, 200, 250, 300, 400, 500 ft/min (0.05 m/s to 0.5, 0.75, 1.0, 1.25, 1.50, 2.0, 2.5 m/s)
Repeatability
8455 and 8465	<±1.0% of reading³
8475	N/A
Response to Flow
8455 and 8465	0.2 sec.⁴
8475	5 sec.⁵
Compensation	32 to 140°F (0 to 60°C)
Operating (electronics	32 to 200°F (0 to 93°C)
Operating (sensor)	32 to 200°F (0 to 93°C)
Storage	32 to 200°F (0 to 93°C)
Resolution (minimum)
0.07% of selected full scale
Input Power
11-30 VDC or 18-38 VAC, 350 mA max⁶
Output
Impedance	Voltage mode: less than 1 ohm, 20 mA max source current
Resistance	Current mode: 500 ohms maximum load
Signal	Field selectable 0–5V, 0–10V, 0–20, 2–10V, mA, 4–20 mA
Time Constant	Field selectable 0.05 to 10 seconds
3 in., 6 in., 9 in., 12 in. (7.5 cm, 15 cm, 22.5 cm, or 30 cm)

	8455/8465	8475
Range	25-10,000 fpm (0.127- 50.8 m/s),selectable	10-500 fpm (0.051- 2.54 m/s),selectable
Accuracy	±(2% of reading at 64.4- 82.4°F (18-28°C) + 0.5% of full scale of selected range)	±(3% of reading at 68.0- 82.4°F (20-26°C) +1% of full scale of selected range)
Response time	0.2 seconds	5.0 seconds
Input power	350 m, 11-30 VDC or 18-28 VAC, A maximum
¹ From 64.4 to 82.4°F (18 to 28°C),outside this range and within temperature compensation range add 0.4% per °F (0.2% per °C). ² From 68 to 78.8°F (20 to 26°C),outside this range and within temperature compensation range add 0.9% per °F (0.5% per °C). Directed sensitivity of the Model 8475 is a +5%/-20% of reading +0/-10 ft/min (+0/-0.05 m/s) over 270° solid angle regardless of flow direction. ³ Standard deviation based on one minute average from 100 to 1,000 fpm (0.5 to 5.0 m/s). ⁴ For 63% of final value, tested at 1,500 fpm (7.5 m/s). ⁵ For 63% of final value, tested at 500 fpm (2.5 m/s). ⁶ Input voltage must be maintained within specifications at the transducer.