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PDF CS616 Data sheet ( Hoja de datos )
| Número de pieza | CS616 | |
| Descripción | (CS616 / CS625) Water Content Reflectometers | |
| Fabricantes | Campbell Scientific | |
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CS616 and CS625
Water Content Reflectometers
Revision: 1/11
www.DataSheet4U.com
Copyright © 2002-2011
Campbell Scientific, Inc.
1 page  
CS616 and CS625 Water Content
Reflectometers
1. General Description
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. See the Sensor
Specifications section for details.
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.
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.
The CS625 output is a square wave output and can be connected to Campbell
Scientific CR200(X) series dataloggers. A CRBasic program using Period
Averaging is used to measure the probe output period and convert to
volumetric water content using calibration equations.
The Water Content Reflectometer consists of two stainless steel rods
connected to a printed circuit board. A shielded four-conductor cable is
connected to the circuit board to supply power, enable the probe, and monitor
the pulse output. The circuit board is encapsulated in epoxy.
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High-speed electronic components on the circuit board are configured as a
bistable multivibrator. The output of the multivibrator is connected to the
probe rods which act as a wave guide. The travel time of the signal on the
probe rods depends on the dielectric permittivity of the material surrounding
the rods and the dielectric permittivity depends on the water content.
Therefore, the oscillation frequency of the multivibrator is dependent on the
water content of the media being measured. Digital circuitry scales the
multivibrator output to an appropriate frequency for measurement with a
datalogger. The Water Content Reflectometer output is essentially a square
wave. The probe output period ranges from about 14 microseconds with rods
in air to about 42 microseconds with the rods completely immersed in typical
tap water. A calibration equation converts period to volumetric water content.
1
5 Page 
CS616 and CS625 Water Content Reflectometer
5.2.1 Sample CRBasic Program 1
The following CR1000 program uses the “CS616” instruction to measure eight
CS616 probes connected to the CR1000 datalogger. Although this example is
for the CR1000, other CRBasic dataloggers are programmed similarly.
Wiring for CRBasic
Program Example 1
CS616
CR1000
CS616#1_Green
5H
CS616#2_Green
5L
CS616#3_Green
6H
CS616#4_Green
6L
#1,2,3,4_Orange
C7
#1,2,3,4_Blk & Clear GND
#1,2,3,4_Red
12 V
CS616#5_Green
7H
CS616#6_Green
7L
CS616#7_Green
8H
CS616#8_Green
8L
#5,6,7,8_Orange
C8
#5,6,7,8_Blk & Clear GND
#5,6,7,8_Red
12 V
Note: All CS616 “12V_Red”
wires connected to CR1000 12 V
terminal (user supplied common
tie post may be required).
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CR1000 Program Example 1
‘Declare Public and Dim Variables
Public batt_volt
Public Panel_temp
Public Period (8)
Public VWC (8)
Public Flag (1)
Dim I
‘Declare Constants
‘CS616 Default Calibration Constants
const a0= -0.0663
const a1= -0.0063
const a2= 0.0007
‘Flag logic constants
const high = true
const low = false
7
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet CS616.PDF ] | |
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