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MP306 Moisture Probe Operation Manual

2.3.2 Results

The results from measurement of absolute volumetric soil water percent (VSW%) from prepared soil

samples using the MP306 are given in Figure 1. This result is typical of the results obtained from

comparative testing of the MP306 in prepared soil samples, for a wide range of agricultural soils.

OVEN

0 5 10 15 20 25 30 35 40

Soil Sample Volumetric

Soil Water (%)

06 = 1.0136x + 0.4298

=0.9931

Figure 1. MP306 Measurement of Absolute Volumetric Soil Water Percent from Prepared

Soil Samples as a Standard.

Volumetric Soil W

ater (%)

06 Measurement of VSW%

Using Soil Samples as a Standard

40
35
30
25
20
15
10

5
0

Содержание MP306

Страница 1: ...3 MP306 Moisture Probe Operation Manual ICT International Pty Ltd PO Box 503 Armidale NSW 2350 AUSTRALIA Phone 61 2 6772 6770 Fax 61 2 6772 7616 Email sales ictinternational com au Web www ictinterna...

Страница 2: ...eration 4 2 3 1 Theory 4 2 3 2 Results 5 2 3 3 Definitions 6 2 4 Calibration 7 2 4 1 General 7 2 4 2 Linear Calibration 7 2 4 3 Polynomial Calibration 7 2 4 4 Polynomial Lookup Table 8 2 5 Wiring 8 2...

Страница 3: ...lly connected to a set of chrome extension rods which have a T handle on the end The extension rods enable the operator to insert the needles of the MP306 into the soil surface without bending over an...

Страница 4: ...ed to be recharged within about 30 days as it will self discharge in this time 2 3 Theory of Operation 2 3 1 Theory The MP306 has a high frequency moisture detector which uses the standing wave princi...

Страница 5: ...s obtained from comparative testing of the MP306 in prepared soil samples for a wide range of agricultural soils MP306 OVEN 0 5 10 15 20 25 30 35 40 Soil Sample Volumetric Soil Water MP306 1 0136x 0 4...

Страница 6: ...ic Soil Water Percent as a Standard 2 3 3 Definitions Gravimetric Soil Water Content is de ned as G Mw Where Mw is the mass of water in the soil sample Ms and Ms is the total mass of the dry soil samp...

Страница 7: ...entists or regulatory authorities may wish to calibrate the MP306 to verify the data measured In these cases it is simply necessary to compare the MP306 output in mV 0 1 mV to the VSW from the soil sa...

Страница 8: ...00 1045 18 93 15 00 415 9 93 75 00 1055 19 07 20 00 510 11 285 80 00 1065 19 21 25 00 610 12 71 85 00 1070 19 28 30 00 720 14 285 90 00 1080 19 43 35 00 825 15 785 95 00 1095 19 64 40 00 895 16 785 1...

Страница 9: ...s 7 18 V DC unregulated Power consumption 32 mA typical Output signal 0 1 V for 0 50 VSW Response Time Less than 0 5 seconds 5 seconds approximately from power up Mechanical Total length 215 mm Diamet...