Campbell CS616 Instruction Manual download pdf (Page 7)

CS616 and CS625 Water Content

Reflectometers

1. Introduction

The CS616 Water Content Reflectometer is an improved version of the CS615

Water Content Reflectometer. The CS625 is a modified CS616 for use with

the Campbell Scientific CR200(X) series dataloggers. The difference between

the CS616 and the CS625 is the output voltage level.

Both water content reflectometers are designed to measure volumetric water

content of soils or other porous media. The water content information is

derived from the probe sensitivity to the dielectric constant of the medium

surrounding the probe rods.

Before installing the CS616 or CS625, please study

• Section 2, Cautionary Statements

• Section 3, Initial Inspection

2. Cautionary Statements

• Although the CS616/CS625 is rugged, it should be handled as precision

scientific instrument.

• External RF sources can affect CS616/CS625 measurements.

Consequently, the CS616/CS625 circuitry should be located away from

significant sources of RF such as ac power lines and motors.

• CS616/CS625 probes enabled simultaneously and within approximately 9

inches of each other can cause erratic measurements. If probes must be

close to each other, configure the enable lines to the datalogger control

ports so that the probes are not enabled simultaneously.

3. Initial Inspection

• Upon receipt of the CS616/CS625, inspect the packaging and contents for

damage. File damage claims with the shipping company.

• The model number and cable length are printed on a label at the

connection end of the cable. Check this information against the shipping

documents to ensure the expected product and cable length are received.

4. Overview

The CS616 output is a square wave output and can be connected to our CR800,

CR850, CR1000, CR3000, CR5000, CR510, CR10X, and CR23X dataloggers.

A special CS616 datalogger instruction is used to measure the probe output

period which is converted to volumetric water content using calibration

equations. Datalogger instructions for period averaging can also be used.

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Campbell CS616 Instruction Manual Page 7