Campbell 229 Dokumentacja Pobierz pdf (Strona 9)

229 Heat Dissipation Matric Water Potential Sensor

3.3 Equilibratio

Installation

d the

e ceramic

pores with liquid water will optimize the hydraulic conductivity between the

ceramic and soil.

the

water

llowed by soaking under a vacuum of ≥71 kPa (0.7 atm)

atmosphere for 1 hour results in complete saturation of the sensor.

4. Wiring

Table 4-1 shows wiring information for the 229 sensor and CE4 or CE8

excita directly to the datalogger without

the us sim tic of these

conne

e m 5 for de multiplexer wiring.

BLE 4- 229 Sensor and CE4/CE8 Wiring

n and Saturation of the Sensor Before

The smaller the difference in water potential between the 229 ceramic an

surrounding soil, the sooner equilibrium will be reached. Filling th

Simple immersion of the sensors in water can leave some entrapped air in

pores. Complete saturation can be closely approached if (1) deaerated water is

used, and (2) saturation occurs in a vacuum. Soaking the ceramic in free

for 12 hours fo

tion module when connecting sensors

e of a multiplexer. Figure 4-1 shows a

ctions.

ple schema

See th ultiplexer program in Section tails on

TA 1.

229 Wire Color

10(X), CR23X, CR800, CR850,

1000, CR3000 E4/CE8

Function

Blue gh side of differential channel Thermocouple Hi High

Red w side of differential channel Thermocouple Low Lo

Green excitation channel Heater High Current

Black Heater Low

Clear Shield G

CE4/CE8 Power 12V +12V

CE4/CE8 Ground G

CE4/CE8 Enable Control Port CTRL

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 33 34

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