Apogee TS-100 Руководство пользователя - Страница 6
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SPECIFICATIONS
TS-100
Radiation-induced Temperature Increase (RITI):
There is no reference standard for the elimination of radiation effects on air temperature measurement,
but well-designed aspirated shields minimize this effect. In the absence of a standard, RITI was analyzed
in long-term tests over snow and grass surfaces by comparing temperature measurements from nine
replicate TS-100 shields to measurements from two replicate aspirated shields from
Met One
(model
R. M. Young
076B) and two replicate aspirated shields from
(model 43502). Comparisons among shields
were made with ST-110 thermistors in all shields. In spite of careful placement of shields away from each
other and the tower (see photo below), and filtering for wind direction, these tests indicate that there is
more variability among replicate shields (± 0.1 C) of the same model than between models of shields (±
0.03 C), thus there is no statistical difference among the three models of shields.
Field tests indicate that low wind speed has a greater effect on RITI than high radiation load. For
-2
-1
conditions of solar radiation greater than 800 W m
and wind speeds less than 2 m s
, the mean of the
Apogee
model TS-100 shields has been within 0.03 C of the means of the other two models of shields.
R. M. Young
At higher wind speeds, the TS-100 and
shields read slightly cooler (-0.05 C) than the mean of
Met One
the
shields, but the difference is not statistically significant.
Difference Among Individual Replicate Shields: < 0.1 C
-1
-1
Aspiration Rate: 6 m s
at full speed; 3 m s
at half speed
Fan Input Voltage Requirement: 12 V DC
Fan Current Drain: 80 mA at full speed; 25 mA at half speed
Fan dust and water protection: IP55
The fan is extremely well sealed against water and dust, with an ingress protection rating of 55, called
IP55. The higher the number the better the protection. Fans typically range from IP11 to IP55. The first