WindMaster and WindMaster Pro
1561-PS-0001.
Issue 11 February 2017
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66
13 APPENDICES
13.1
Guarantee
For terms of guarantee contact your supplier.
Warranty is void if the green security seal covering base nuts is damaged or broken, or the transducer caps have been
damaged.
13.2
Improvement Key Notes
The following are extracts from an amended Key Note Document regarding improvements to the WindMaster and
WindMaster Range.
Key Note Series Number
KN1508
Subject
Improvements to the WindMaster Product Range (detailed amended)
Applicable models
WindMaster / WindMaster Pro
Date:
5
th
October 2015 (amended)
Technical Improvements to WindMaster (WM) and WindMaster Pro (WM Pro) products from mid Oct.
2015 will provide:
WM and WM Pro products will receive the following improvements without any change to the transducers
themselves or basic geometry/path lengths/measurements of the units, ensuring continuity of design and
existing performance characteristics, while allowing significant improvements to some areas without any
change to the known good behaviour of the products.
Sonic Temperature
Sonic temperature improvements:-
±2
⁰
C maximum error compared to reference quality ambient slow response (< 1 Hz) temperature
measurements over an extended temperature range of -20
⁰
C to +30
⁰
C.
Fast response (1 Hz or faster) sonic temperature performance remains excellent and unchanged (Eddy
Covariance Quality).
The improvements allow the WM/WM Pro users to consider using the sonic temperature output as a
general thermometer reading where appropriate for ancillary measurements and to assist in H2O flux
corrections without the need for additional thermometers (and associated errors/time series/different
spatial locations). Previously, WM and WM Pro products could have as much as 6
⁰
C sonic temperature
error compared to ambient reference measurements. Improvements have been made to the way the
transducer stalk is mounted, the way the transducer is housed within the stalk, which in turn means less
delay in the measurement and therefore better accuracy.
Removal of a non-linear error in slow response sonic temperature around 0
⁰
C:-
Previous WM/WM Pro products could, in some cases, have as much as 12
⁰
C total error between – 5
⁰
C and
+ 5
⁰
C ambient temperatures. The removal of this error makes any error in sonic temperature very easy to
correct for using a simple ‘trend’ baseline correction, where desired (as the sonic temperature will be
within ±2
⁰
of the baseline reference ambient temperature).
Again, the improvements come from production process improvements (better automation and
repeatability due to higher volume production, along with improvements to the way the transducer is
housed in the stalk and frame of the anemometer.) This improvement will greatly assist the flux community
with research in cold environments looking at small scale flux onset around 0
⁰
C with better results and less
correction needed.
