Casella CEL Airborne particulate monitoring system - Manual (Page 13)

HB3256-03 Page 11
OPTIONAL SENSORS .
Wind Speed
Description
This sensitive anemometer is based upon the three cup rotor design. The instrument is robust
and easy to use, with overall design determined by the extensive use of the Royal College of
Aeronautics (CIT) wind tunnel facilities.
The instrument has been designed and tested to meet the recommendations adopted by the
European Commission CIMO (WMO N272 Brussels 11-22 September 89).
The instrument is constructed using Aluminium alloy, which is then anodised. This results in a
durable all weather construction.
Specification
Transducer
Optical interrupter
Maximum design wind speed 75 metres/second
Starting velocity Typically 0.4 metres/second
Distance constant Typically 5.3
Resolution 7.2 cms
Non-Linearity † 0.6 % (from 3 to 40 metres/second)
Accuracy † 1% above 3 metres/second
Calibration 13.8 Hz/metre/second
Pulses per rev 20
Operating temperature range -20 °C to + 70°C
Storage temperature range -50 °C to + 70°C
Supply voltage 7-20 volts d.c.
Current consumption Typically 15mA at 12 volts
Output calibration 0 to 5 volt pulses.
Part no. 120800B-03