Campbell CS616 User manual

CS616 & CS625
Water Content
Reflectometers
Issued: 11.8.15
Copyright © 2002-2015 Campbell Scientific, Inc.
Printed under licence by Campbell Scientific Ltd.
CSL 467
USER MANUAL

Guarantee
This equipment is guaranteed against defects in materials and workmanship.
This guarantee applies for 24 months from date of delivery. We will repair or
replace products which prove to be defective during the guarantee period
provided they are returned to us prepaid. The guarantee will not apply to:

Equipment which has been modified or altered in any way without the
written permission of Campbell Scientific

Batteries

Any product which has been subjected to misuse, neglect, acts of God or
damage in transit.
Campbell Scientific will return guaranteed equipment by surface carrier
prepaid. Campbell Scientific will not reimburse the claimant for costs incurred
in removing and/or reinstalling equipment. This guarantee and the Company’s
obligation thereunder is in lieu of all other guarantees, expressed or implied,
including those of suitability and fitness for a particular purpose. Campbell
Scientific is not liable for consequential damage.
Please inform us before returning equipment and obtain a Repair Reference
Number whether the repair is under guarantee or not. Please state the faults as
clearly as possible, and if the product is out of the guarantee period it should
be accompanied by a purchase order. Quotations for repairs can be given on
request. It is the policy of Campbell Scientific to protect the health of its
employees and provide a safe working environment, in support of this policy a
“Declaration of Hazardous Material and Decontamination” form will be
issued for completion.
When returning equipment, the Repair Reference Number must be clearly
marked on the outside of the package. Complete the “Declaration of
Hazardous Material and Decontamination” form and ensure a completed copy
is returned with your goods. Please note your Repair may not be processed if
you do not include a copy of this form and Campbell Scientific Ltd reserves
the right to return goods at the customers’ expense.
Note that goods sent air freight are subject to Customs clearance fees which
Campbell Scientific will charge to customers. In many cases, these charges are
greater than the cost of the repair.
Campbell Scientific Ltd,
80 Hathern Road,
Shepshed, Loughborough, LE12 9GX, UK
Tel: [phone]
Fax: [phone]
Email: [email protected]
www.campbellsci.co.uk

PLEASE READ FIRST
About this manual
Please note that this manual was originally produced by Campbell Scientific Inc. primarily for the
North American market. Some spellings, weights and measures may reflect this origin.
Some useful conversion factors:
Area: 1 in2(square inch) = 645 mm2
Length: 1 in. (inch) = 25.4 mm
1 ft (foot) = 304.8 mm
1 yard = 0.914 m
1 mile = 1.609 km
Mass: 1 oz. (ounce) = 28.35 g
1 lb (pound weight) = 0.454 kg
Pressure: 1 psi (lb/in2) = 68.95 mb
Volume: 1 UK pint = 568.3 ml
1 UK gallon = 4.546 litres
1 US gallon = 3.785 litres
In addition, while most of the information in the manual is correct for all countries, certain information
is specific to the North American market and so may not be applicable to European users.
Differences include the U.S standard external power supply details where some information (for
example the AC transformer input voltage) will not be applicable for British/European use. Please
note, however, that when a power supply adapter is ordered it will be suitable for use in your country.
Reference to some radio transmitters, digital cell phones and aerials may also not be applicable
according to your locality.
Some brackets, shields and enclosure options, including wiring, are not sold as standard items in the
European market; in some cases alternatives are offered. Details of the alternatives will be covered in
separate manuals.
Part numbers prefixed with a “#” symbol are special order parts for use with non-EU variants or for
special installations. Please quote the full part number with the # when ordering.
Recycling information
At the end of this product’s life it should not be put in commercial or domestic refuse
but sent for recycling. Any batteries contained within the product or used during the
products life should be removed from the product and also be sent to an appropriate
recycling facility.
Campbell Scientific Ltd can advise on the recycling of the equipment and in some cases
arrange collection and the correct disposal of it, although charges may apply for some
items or territories.
For further advice or support, please contact Campbell Scientific Ltd, or your local agent.
Campbell Scientific Ltd, Campbell Park, 80 Hathern Road, Shepshed, Loughborough, LE12 9GX, UK
Tel: [phone] Fax: [phone]
Email: [email protected]
www.campbellsci.co.uk

i
Contents
PDF viewers: These page numbers refer to the printed version of this document. Use the
PDF reader bookmarks tab for links to specific sections.
1. Introduction................................................................1
2. Cautionary Statements..............................................1
3. Initial Inspection ........................................................1
4. Quickstart...................................................................2
5. Overview.....................................................................4
6. Specifications ............................................................5
6.1 Dimensions ..........................................................................................5
6.2 Weight..................................................................................................5
6.3 Electrical Specifications.......................................................................6
6.4 Operational Details ..............................................................................6
7. Installation..................................................................7
7.1 Orientation ...........................................................................................7
7.2 Potential Problems with Improper Insertion ........................................7
7.3 Wiring..................................................................................................7
7.4 Datalogger Programming.....................................................................8
7.4.1 CS616 CRBasic Programming......................................................8
7.4.2 CS625 CRBasic Programming......................................................9
8. Operation..................................................................10
8.1 Water Content Reflectometer Method for Measuring Volumetric
Water Content.................................................................................10
8.1.1 Response Curves.........................................................................10
8.1.2 Calibration Equations..................................................................12
8.1.3 Operating Range .........................................................................14
8.1.3.1 Soil Electrical Conductivity .............................................14
8.1.3.2 Soil Organic Matter, Clay Content, and Soil Bulk
Density..........................................................................15
8.1.4 Error Sources in Water Content Reflectometer Measurement....15
8.1.4.1 Probe-to-Probe Variability Error......................................15
8.1.4.2 Insertion Error ..................................................................15
8.1.4.3 Signal Attenuation Error ..................................................16
8.1.5 Temperature Dependence and Correction...................................16
8.2 Water Content Reflectometer User-Calibration.................................17
8.2.1 Signal Attenuation in Conductive Soils and Need for Site-
Specific Calibration.................................................................17
8.2.2 User-Derived Calibration Equation ............................................18
8.2.3 Collecting Laboratory Data for Calibration................................18
8.2.4 Collecting Field Data for Calibration..........................................21
8.2.5 Calculations ................................................................................23
9. Maintenance.............................................................23

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10. References ...............................................................23
Appendices
A. Discussion of Soil Water Content......................... A-1
B. Importing Short Cut Code..................................... B-1
C. Example Programs ................................................ C-1
C.1 CS616 Programs ..............................................................................C-1
C.1.1 CR1000 Program for Measuring Eight CS616 Probes .............C-1
C.1.2 CR1000/Multiplexer Program for Measuring 48 CS616
Probes....................................................................................C-3
C.2 CS625 Programs ..............................................................................C-5
C.2.1 CR200(X) Program for Measuring Four CS625 Probes...........C-5
C.2.2 CR200(X) Program with Temperature Correction ...................C-6
Figures
7-1. Water content reflectometer wires .......................................................8
8-1. CS616 and CS625 linear and quadratic calibrations derived from
loam soil .........................................................................................11
8-2. CS616 response for different soil types .............................................12
8-3. Linear versus quadratic calibration differences .................................13
8-4. Percent volumetric water content error adjusted with temperature
correction equation .........................................................................17
Tables
7-1. Datalogger/Reflectometer Wiring........................................................7
8-1. Standard calibration coefficients for linear and quadratic forms .......13
8-2. Calibration coefficients for sandy clay loam with bulk density
1.6 g cm–3and electrical conductivity at saturation 0.4 dS m–1
for both linear and quadratic forms. ...............................................14
8-3. Calibration coefficients for sandy clay loam with bulk density
1.6 g cm–3and electrical conductivity at saturation 0.75 dS m–1
for both linear and quadratic forms. ...............................................14
C-1. Datalogger Connection for Eight CS616s Example Program..........C-1
C-2. Wiring for CR1000/Multiplexer Example .......................................C-3
C-3. Wiring for CR200(X) Program Measuring Four CS625 Probes......C-5
C-4. CS625 Wiring for CR200X Program with Temperature
Correction.....................................................................................C-6
C-5. 109 Wiring for CR200X Program with Temperature Correction ....C-6

1
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 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 (VWC) 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.
This manual provides information only for CRBasic
dataloggers. It is also compatible with several of our retired
Edlog dataloggers. For Edlog datalogger support, see an
older manual at www.campbellsci.com/old-manuals or
contact a Campbell Scientific application engineer for
assistance.
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.
NOTE

CS616 and CS625 Water Content Reflectometers
2
4. Quickstart
Short Cut is an easy way to program your datalogger to measure the CS616
or CS625 probe and assign datalogger wiring terminals. The following
procedure shows using Short Cut to program the CS616. The procedure
for the CS625 is similar.
1. Install Short Cut by clicking on the install file icon. Get the install file
from either www.campbellsci.com, the ResourceDVD, or find it in
installations of LoggerNet, PC200W, PC400, or RTDAQ software.
2. The Short Cut installation should place a shortcut icon on the desktop
of your computer. To open Short Cut, click on this icon.
3. When Short Cut opens, select New Program.