Campbell DOT600 Manuel utilisateur

DOT600 Roadbed

Water Content Meter

1/10

Campbell Scientific, Inc.

Warranty and Assistance

The DOT600 ROADBED WATER CONTENT METER is warranted by

CAMPBELL SCIENTIFIC, INC. to be free from defects in materials and

workmanship under normal use and service for twelve (12) months from date

of shipment unless specified otherwise. Batteries have no warranty.

CAMPBELL SCIENTIFIC, INC.'s obligation under this warranty is limited to

repairing or replacing (at CAMPBELL SCIENTIFIC, INC.'s option) defective

products. The customer shall assume all costs of removing, reinstalling, and

shipping defective products to CAMPBELL SCIENTIFIC, INC. CAMPBELL

SCIENTIFIC, INC. will return such products by surface carrier prepaid. This

warranty shall not apply to any CAMPBELL SCIENTIFIC, INC. products

which have been subjected to modification, misuse, neglect, accidents of

nature, or shipping damage. This warranty is in lieu of all other warranties,

expressed or implied, including warranties of merchantability or fitness for a

particular purpose. CAMPBELL SCIENTIFIC, INC. is not liable for special,

indirect, incidental, or consequential damages.

Products may not be returned without prior authorization. The following

contact information is for US and International customers residing in countries

served by Campbell Scientific, Inc. directly. Affiliate companies handle

repairs for customers within their territories. Please visit

www.campbellsci.com to determine which Campbell Scientific company

serves your country.

To obtain a Returned Materials Authorization (RMA), contact CAMPBELL

SCIENTIFIC, INC., phone (435) 753-2342. After an applications engineer

determines the nature of the problem, an RMA number will be issued. Please

write this number clearly on the outside of the shipping container.

CAMPBELL SCIENTIFIC's shipping address is:

CAMPBELL SCIENTIFIC, INC.

RMA#_____

815 West 1800 North

Logan, Utah 84321-1784

For all returns, the customer must fill out a “Declaration of Hazardous Material

and Decontamination” form and comply with the requirements specified in it.

The form is available from our website at www.campbellsci.com/repair. A

completed form must be either emailed to repair@campbellsci.com or faxed to

435-750-9579. Campbell Scientific will not process any returns until we

receive this form. If the form is not received within three days of product

receipt or is incomplete, the product will be returned to the customer at the

customer’s expense. Campbell Scientific reserves the right to refuse service on

products that were exposed to contaminants that may cause health or safety

concerns for our employees.

DOT600 Table of Contents

PDF viewers note: These page numbers refer to the printed version of this document. Use

the Adobe Acrobat® bookmarks tab for links to specific sections.

1. General Description.....................................................1

2. What Parts Comprise the DOT600 .............................2

3. Specifications ..............................................................3

4. User Interface for Measurement and Control............4

4.1 The Keypad...............................................................................................4

4.2 Main Menu ...............................................................................................4

4.2.1 Project Information.........................................................................5

4.2.2 Test ID Data....................................................................................5

4.2.3 Make Measurements.......................................................................6

4.2.4 System Menu ..................................................................................6

4.2.5 Measurement Report.......................................................................6

5. Making Measurements with the DOT600...................7

5.1 Tare Scale .................................................................................................8

5.2 Fill Sample Chamber................................................................................9

5.2.1 Weigh the Sample...........................................................................9

5.3 Compress Sample and Measure Water Content......................................10

5.3.1 Write Measurement Data to Record..............................................13

5.3.2 Start New Test...............................................................................14

5.4 Removing Samples.................................................................................14

6. Detailed Description..................................................15

6.1 Power System .........................................................................................15

6.1.1 Battery, Charger and Power Switch..............................................15

6.2 CR850 Datalogger..................................................................................15

6.3 Water Content Measurement..................................................................15

6.3.1 Electronics and Waveguide...........................................................15

6.3.2 Sample Chamber Volume and Compression Force ......................16

6.3.3 Water Content Calibration ............................................................16

7. Maintenance...............................................................16

DOT600 Table of Contents

Appendix

A. Design and Calibration ...........................................A-1

A.1 Description of Basic Technology........................................................A-1

A.2 Description of the Modified Device....................................................A-2

A.3 Detailed Description of any Field and Laboratory Work....................A-2

A.4 Displacement Sensor Calibration........................................................A-3

A.5 Sensitivity of Weight Position on Scale Surface................................. A-4

A.6 Soil Water Content Calibration...........................................................A-4

A.7 Description of the Test Performed and Factors Which Could Have

Effect on Results of DOT600 Measurements....................................A-5

Figures

1. Cross sectional drawing shows mounting of battery and charger/

regulator beneath panel ..................................................................... 15

A-1. Typical scale calibration. The standard error is 0.013 g....................A-3

A-2. Typical calibration data for the displacement sensors.......................A-4

A-3. Partial calibration set showing calibration data and equation.

The effect of clay content on sensor response is apparent .............. A-5

Tables

1. Common and Special Keypad Functions................................................... 4

2. Information in the report............................................................................ 6

DOT600 Roadbed Water Content Meter

1. General Description

The DOT600 is a portable device for measuring the water content of soils used

in construction of roads, parking lots, foundations, etc. Samples collected from

field sites are compacted using a vertical stress of (15-45 PSI), then the water

content is measured using dielectric permittivity sensitive methods. A separate

scale and magnetic linear sensors measure the sample volume and mass, which

allows calculation of bulk density and conversion of the measured volumetric

water content to gravimetric water content. Measurement results are written to

a data table for permanent record. All measurements are controlled by a

Campbell Scientific CR850 datalogger which includes an 8 line display and

keypad for interface.

DOT600 Roadbed Water Content Meter

2. What Parts Comprise the DOT600

DOT600 components are housed in a rugged case. Contained in the case are:

1. Cable to charge DOT 600 from AC power source

2. Sample chamber base

3. Sample chamber cylinder

4. Ratcheting box-end wrench

5. Compression cap

6. Sieve, #4 mesh

7. DOT600 operating manual

8. RS-232 serial cable

9. PC200W software

10. External Keypad

DOT600 Roadbed Water Content Meter

3. Specifications

Power

Battery

2.9 Ahr rechargeable sealed lead-acid battery

Operating temperature range: -20°C to 60°C

Standby charge retention at 20°C for one year = 95%

Lifetime approximately 500 cycles with discharge to 50% followed by

recharge.

See section Power System

Scale

Capacity = 1000 g

Accuracy = ±0.032%

Repeatability = 0.02% FS

The scale has overload protection in both the up and down directions during

shipping. But it only has overload protection in the down direction during use.

Water Content Measurement

Resolution = 1% volumetric water content

Precision = 0.75% volumetric water content

Resolution is the minimum change in the measured parameter, water content,

that the sensor can repeatedly detect.

Precision is the expected range for repeated measurements on the same sample.

Accuracy is defined by comparing DOT600 measured water contents to

independently determined values. The independent method is water content by

gravimetric method (weighing sample before and after oven drying).

The DOT600 water content measurement uses a calibration to convert sensor

output period to volumetric water content. This calibration was derived at the

factory for various soil types. The calibration coefficients used are determined

by the material type selected by the user. Repeated measurements on the sandy

loam soil over the water content range from air dry to about 70% saturation

show deviations from independent measurements of less than ±1.5%

volumetric water content.

Since the gravimetric water content measurement uses sample volume and

weight to convert from measured volumetric water content, the accuracy of the

gravimetric water content will be less than the volumetric value because of

inherent errors of the volume and weight measurements.

Sample Volume and Applied Force Measurement

Sample Volume

±1.5% for compressed sampled with thickness between .400 in to 1.000 in.

Sensitive Volume

The electromagnetic field penetrates the sample 0.39 in. Sensitive volume is

about 3.5 in3.

Applied vertical stress range and accuracy

Applied vertical stress: 0 to 45 PSI.

Applied vertical stress measurement accuracy: 1.7 PSI.

DOT600 Roadbed Water Content Meter

4. User Interface for Measurement and Control

The Measurement and Control Datalogger has a built-in ruggedized

membrane-switch keypad for control and a display with 8 lines and 21

characters per line. Measurement control uses a hierarchical structure of

menus and submenus.

4.1 The Keypad

The keypad keys that are commonly used or have special functions are listed in

Table 1.

TABLE 1. Common and Special Keypad Functions

Key Usage

[2] and [8] Navigate up and down through the menu list one line at a time

[Enter] Selects the line or toggles the option of the line the cursor is on

[Esc] Backs up one level in the menu

[Home] Moves cursor to top of the list

[End] Moves cursor to bottom of the list

[BkSpc] Delete character to the left

[Shift] Change alpha character selected (shown at top right)

[Num Lock] Change to numeric entry

4.2 Main Menu

The Main Menu is the starting point for each set of measurements and is

discussed in this section.

DOT600 Roadbed Water Content Meter

4.2.1 Project Information

A 9-digit alphanumeric value can be entered to identify the project. The

current date is automatically set. The project information is written to the

measurement report (see Measurement Report section). Data can be displayed

in either Imperial or SI units.

4.2.2 Test ID Data

The elements of this submenu allow the user to enter information about a set of

measurements. Scroll to the element and press the Enter button to enter value.

The entered information will appear in the report. Abbreviations such as

“Matrl Type” are used because the number of characters used in a field is

limited.

Parameter Description

Tester Enter name of person performing the measurements

Test # Enter a numeric test identifier

Material Type

(Matrl Type) Press Enter and scroll the pick list to select a soil type,

or select “custom” for custom material. The sandy

loam calibration has been found to work for most

typical soils

Station (X-Coor)

Offset (Y-Coor)

Depth (Z-Coor)

Enter value to identify sample location(s) in X, Y and

Z coordinates

DOT600 Roadbed Water Content Meter

4.2.3 Make Measurements

Scrolling to and selecting Make Measurements allows selection of

measurement steps and displays the results as measurements are made. See

Measurement section for detailed description.

4.2.4 System Menu

The System Menu allows user access to numerous settings and data. For

operation of the DOT600, the only control of interest is System

Menu/Configure, Settings/Display. From this menu the user can control the

display back lighting, contrast and display timeout to save power. The

calibration file can also be edited through this menu, and a list of files stored on

the datalogger CPU can be accessed.

4.2.5 Measurement Report

A command in the measurement sequence writes measurement data to a file.

The information in the file is similar to information recorded on data sheets

commonly used by Departments of Transportation. Table 2 describes the

report information. Units are SI or Imperial, as selected by user.

TABLE 2. Information in the report.

Variable Description

TIMESTAMP Date and time when measurements are written

to data file

RECORD Record number

Project# Value entered by user to identify project

DMY Day, month and year

Tester Value entered by user to identify person making

measurements

TestNum Incremental record number. Automatically

increments after each data write to output table

XCoordinate, YCoordinate,

ZCoordinate Values entered by user to identify sample

location

Per Output period of measurement circuit

Freq Output frequency of measurement circuit

Gwc Gravimetric water content

Vwc Volumetric water content

Material Type Soil texture

Dry Bulk Density Sample dry bulk density

Sample Weight Sample net weight

SampleVolume Sample volume

SampleDepth Depth or thickness of sample at time of

measurement

Table des matières

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