Campbell HydroSense II Uživatelská příručka stáhnout pdf (Strana 7)

HydroSense II Soil Moisture Measurement System

Please note that unlike the previous generation HydroSense, the 12cm and 20cm

sensor rods are not interchangeable.

Along with volumetric water content the HydroSense II can also display relative

water content based on “wet” and “dry” reference measurements previously set

by the user. Along with relative water content, the unit can also display water

deficit indicating how much water is required (in mm of rain) to bring the soil

back to the previously saved “wet” value.

Measurements are made by fully inserting the probe rods into the soil and

pressing the Read/OK button. The process takes between 1 and 2 seconds after

which the value can be stored and later downloaded to a computer for display

and analysis. Communication between the computer and HydroSense II are

carried out using Bluetooth. The HydroSense II also includes an GPS (Global

Positioning System) received which enables data to be stored with position

information. This technique is known as geo-tagging.

The HydroSense II has many power saving features – the device turns off when

it has been idle for a configurable period, the backlight brightness and on-time

are adjustable, the backlight is automatically disabled in bright conditions, as

well as the GPS and Bluetooth can each be forced off to extend battery life,

albeit with reduced functionality.

2 Specifications

2.1 HydroSense II Display specifications

HydroSense II measurement and display unit

Display

128x64 pixel graphic LCD

Backlight

Blue/White LED brightness adjustable

GPS Accuracy

±5m position (typ), ±1ms time with GPS sync

Bluetooth range

Approx. 10m

Data storage

>1000 records (oldest data overwritten first)

Zone storage

>100 records

Batteries

4 x AA alkaline (included)

Power consumption (approx.)

20μA asleep

+2mA backlight off

+18mA backlight 60%

+30mA backlight 100%

+35mA GPS

+30mA Bluetooth

Expected Battery Life

6 – 12mths (depends on usage)

Size (LxWxH)

200mm x 100mm x 58mm

Weight (g)

340g

2.2 HydroSense II sensor specifications

HydroSense II sensor – CS658

Measurement principle

Time Domain Reflectometry

Communication

SDI-12

Rod length

20cm

Rod diameter

4.7mm (nominal)

Measurement range

0% - 50%

Precision

<0.05%

Accuracy

±3% VWC in mineral soils with solution EC ≤4dS/m

Size (LxWxH)

100mm x 92mm x 40mm (sensor body)

Weight (g)

450g

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