Gill Instruments WindObserver II User Manual

Gill Instruments Ltd
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WindObserver II Page 37 Issue 18
Doc. No. 1390-PS-0004 January 2009
Polar mode direction wraparound
The Wind Direction in Polar mode can be configured for either Standard (0 - 359°) or
Wraparound (0 - 539°
°°
°) options. If the Standard mode is used with a chart recorder, large
swings of the recorder pen will be experienced each time the wind direction passes
between 0 and 359°. Using the Wraparound mode, when the wind first changes from 0° to
359°, there will be a step change on the output, but after this first time the output will
change smoothly each time the wind passes through 360°. (Similarly, the first time the
wind veers from 539° to 180°, there will be a step change, after which the output will
change smoothly).
Voltage output (V) Current output (mA)
Wind
direction
(degrees)
Standard Wraparound Standard Wraparound
0 0 0 4.00 4.00
180 2.5 1.67 12.00 9.33
360 5.0 3.33 20.00 14.67
540 N/a 5.0 N/a 20.00
Low wind speeds
Whilst the wind speed is below 0.05 metres/sec, the wind direction will not be calculated,
all other output parameters will continue to update at the output rate.
The following Table shows Channel 1, 2 and 3 outputs with Polar Continuous, 4-20mA
current outputs under various operating conditions.
Condition Channel 1
(Wind Speed)
Channel 2
(Wind Direction)
Channel 3
(Status)
Wind Speed,
Greater Than
0.05m/s
Variable 4 to 20mA
(value depends on
Output scaling)
Variable 4 to 20mA
(Value depends on
Output scaling)
4mA
(Unit functioning
correctly)
Wind Speed,
Less Than
0.05m/s
Variable close to
4mA.
Outputs last known
good/valid current
reading until wind
increases above
0.05m/s.
4mA
(Unit functioning
correctly)
Any Wind Speed
with Failure
Codes Output 01,
02, 04 etc
Fixed 4mA until
fault clears.
Outputs last known
good/valid current
reading until fault
clears.
0mA
(Failure code present)

Gill Instruments WindObserver II Specifications

General

Brand	Gill Instruments
Model	WindObserver II
Category	Measuring Instruments
Language	English