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ECHNICAL DATA OF INSTRUMENT PROBES AND MODULES
Probes for air speed measurement
Hot-wire probe: AP471 S1 - AP471 S2 - AP471 S3 - AP471 S4
AP471 S1 - AP471 S3 AP471 S2 AP471 S4
Type of measurements Air speed, calculated flow, air temperature
Type of sensor
Speed NTC Thermistor sensor Omnidirectional NTC
Thermistor sensor
Temperature NTC Thermistor sensor NTC Thermistor sensor
Measuring range
Speed 0.1…40m/s 0.1…5m/s
Temperature -25…+80°C -25…+80°C 0…+80°C
Measuring resolution
Speed
0.01m/s (0.1…19.99) - 0.1m/s (20.0 ...)
0.1 km/h
1 ft/min (0…1999) - 10ft/min (2.00·10
3
...)
0.1 mph
0.01 m/s (0.1…5 m/s)
0.1 km/h
1 ft/min
0.1 mph
Temperature 0.1°C (-25…+80°C) 0.1°C (-25…+80°C)
Measuring accuracy
Speed ±0.1 m/s (0.1…0.99 m/s) ±0.05m/s (0.1…0.99 m/s)
±0.3 m/s (1.00…9.99 m/s) ±0.15m/s (1.00…5.00 m/s)
±0.8 m/s (10.00…40.0 m/s)
Temperature ±0.8°C (-10…+80°C) ±0.8°C (-10…+80°C)
Min. speed 0.1 m/s
Air temperature
compensation
0…80°C
Battery life
Approx. 20 hours at 20 m/s using alkaline
batteries Approx. 30 hours at 5 m/s using
alkaline batteries
Unit of measurement
Speed m/s – km/h – ft/min – mph
Flow l/s – m
3
/h – cfm
Duct section for flow
calculation
0.001…1.999 m
2
Cable length ~2m