DeltaOHM HD32.1, Operating Manual

Page: 76 / 158

HD32.1
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V2.1
6.2.7 Technical information on Hot-wire wind speed measurement and temperature probes using
SICRAM module
AP471 S1 - AP471 S2 - AP471 S3 - AP471 S4
AP471 S1 - AP471 S3 AP471 S2 AP471 S4
Type of measurements Wind speed, calculated flow rate, air temperature
Type of sensor
Speed NTC thermistor Omni directional NTC
thermistor
Temperature NTC thermistor NTC thermistor
Measurement range
Speed 0.1…40m/s 0.1…5m/s
Temperature -25…+80°C -25…+80°C 0…80°C
Measurement resolution:
Speed
0.01 m/s
0.1 km/h
1 ft/min
0.1 mph
0.1 knot
Temperature 0.1°C
Measurement accuracy
Speed ±0.2 m/s (0.10…0.99 m/s) ±0.05 m/s (0.10…0.99 m/s)
±0.4 m/s (1.00…9.99 m/s) ±0.15 m/s (1.00…5.00 m/s)
±0.8 m/s (10.00…40.00 m/s)
Temperature ±0.8 °C (-10…+80°C) ±0.8 °C (-10…+80 °C)
Minimum speed 0.1 m/s
Air temperature
compensation
0…80°C
Care and maintenance of the probes
The speed sensor of the AP471 S… probes is heated and, in the presence of gas vapors,
could trigger a fire or explosion. Do not use the probe in the presence of
inflammable gases. Ensure that no gas or explosive vapor leakage is present in the
measurement environments
.
The probe is very delicate and should be handled with extreme care. Even a simple collision,
especially of the omni directional probes that have an uncovered sensor, could render the probe
unusable. After measurement, the sensor set on the probe head must be protected with the supplied
metallic screen or threaded cylinder. During use, the AP471 S4 omni directional probe must be
protected with the special metallic grid. During transportation, the sensor must be closed into a
cylinder screwed on the end part of the probe.
Do not let fingers touch the sensors. Use only distilled water to clean the probe.