Vaisala WMS302 Guía de usuario Pagina 254

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User's Guide ______________________________________________________________________
252 __________________________________________________________________M210630EN-B
Soil Moisture Sensor
Specifications
Table 80 Soil Moisture Sensor ML2x Specifications
Property Description/Value
Full Range
0 ... 1.0 m
3
.m
-3
Accuracy
±0.02 m
3
.m
-3
after calibration to a specific soil
type, or, ±0.05 m
3
.m
-3
using the supplied soil
calibration, in all 'normal' soils, over range 0.05
to 0.6 m
3
.m
-3
and 0 to 40 °C ambient
temperature.
Soil conductivity range Accuracy figures apply over a soil conductivity
range of 0 to 100 mS.m
-1
. Calibratable up to
2000 mS.m
-1
.
Soil sampling volume 90% influence within cylinder of 2.5 cm diam.,
6 cm long, (approx 30 cm
3
), surrounding
central rod.
Environment Can be buried to wide ranging soil types or
water for long periods without malfunction or
corrosion.
Stabilization time 1 ... 5 s from power-up, depending on accuracy
required.
Response time Less than 0.5 s to 99% of change
Duty cycle 100 % (continuous operation possible)
Input requirements 5 ... 15 VDC unregulated
Current consumption 19 mA typical, 23 mA max.
Output signal
Approx. 0 ... 1 VDC for 0 ... 0.5 m
3
.m
-3
Dimensions Measuring rods 60 mm (2.4 in.), overall length
207 mm (8.1 in.) including pins (see Figure 170
on page 253).
Extension Tubes (optional) For convenient placement and removal when
burying. Choice of 0.5 m (19.7 in.) or 1 m (39.4
in.). Can be joined.
Case material PVC
Rod material Stainless steel
Cable length Standard 5 m (16.4 ft.). Maximum length 100
m (328 ft.)
Weight with 5 m (16.4 ft.)
cable
350 g (0.77 lb.)
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