Casella CEL Airborne particulate monitoring system - Manual (Page 14)

HB3256-03 Page 12
Wind Direction
Description
This sensitive wind vane has been designed and tested to meet the recommendations adopted by
the European Commission CIMO (WMO N272 Brussels 11 - 22 September 1989).
The instrument is constructed using aluminium alloy, which is then anodised. This results in a
durable all weather construction.
Specification
Transducer
Continuous rotation wirewound
potentiometer
Maximum design wind speed 75 metres/second
Aligning threshhold 1.2 metres/second @ 10° offset
Distance constant Typically 2.3
Undamped natural wavelength 6.2 metres
Damping ratio 0.35 to 0.45
Repeatability 0.5% f.s.d.
Time constant 0.35 second
Electrical angle 0 - 355° (north between 355° and 0°)
Operating temperature range -20°C to +70°C
Storage temperature range -50°C to +70°C
Supply voltage 7 to 20 volts d.c.
Current consumption Typically 2 to 3mA at 12 volts
Output calibration 0 to 1.8 volts d.c. for 0 - 355° rotation.
Deadband = 0 volts output
Part no. 120804B-04