Decagon Devices ECH2O EA-10 통합자 매뉴얼 - 페이지 12

{카테고리_이름} Decagon Devices ECH2O EA-10에 대한 통합자 매뉴얼을 온라인으로 검색하거나 PDF를 다운로드하세요. Decagon Devices ECH2O EA-10 14 페이지. Soil moisture sensor

EA-10 Soil Moisture Sensor Integrator's Guide

3. How the EA-10 Works

(no air gaps). The soil must therefore be packed tightly

around the entire probe length during installation. The

probe is installed with the blade perpendicular to the

surface to interfere as little as possible with water

movement through the soil.

Calibration

The probe reading is converted to volumetric water

content using the following equation:

Volumetric Water Content = 0.0425 x Current - 0.342

-3

Water content is in m

, and current is in milli-

amps. For water content in terms of percent of total

volume, use the following equation:

Volume percent = 4.25 x Current - 34.2.

These calibrations are for typical soils with mid range

texture, and are accurate enough for most irrigation

scheduling purposes. For greater accuracy, a soil spe-

cific calibration should be undertaken, as outlined on

the Decagon website.

ECH

O EA-10 sensors are tested to perform cor-

rectly in the following conditions:

Sensor output in air: 4.3 - 4.9 mA

Sensor output in distilled water: 17.6 - 18.2 mA