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Summary of Contents for Campbell DMM600
- Page 1 DMM600 Duff Moisture Meter Revision: 11/12 C o p y r i g h t © 2 0 0 2 - 2 0 1 2 C a m p b e l l S c i e n t i f i c ,...
- Page 3 Campbell pricelist or product manual. Products not manufactured, but that are re-sold by Campbell, are warranted only to the limits extended by the original manufacturer. Batteries, fine-wire thermocouples, desiccant, and other consumables have no warranty.
- Page 4 SCIENTIFIC, INC., phone (435) 227-9000. 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.
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Page 5: Table Of Contents
PCDMM Software ................11 7.5.1 Introduction.................11 7.5.2 Calibration Equation ..............12 7.5.3 Description of PCDMM Functions ..........12 7.5.3.1 Menus................12 7.5.3.2 Indicators................13 7.5.3.3 Command Buttons............13 Calibration..................13 7.6.1 DMM600 Standard Calibration...........13 7.6.2 User Calibration ................14 7.6.2.1 Equipment Required for User Calibration......14 7.6.2.2 Calibration Procedure............14... - Page 6 Duff placed in sieve................4 4-3. Duff placed in chamber ............... 4 4-4. Turn knob to make measurement ............5 4-5. Bottom of DMM600................6 7-1. Downloading coefficients to convert to gravimetric water content... 10 7-2. PCDMM user interface display ............12 7-3.
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Page 7: Overview
The DMM600 is a precision instrument. Please handle it with care. Initial Inspection Upon receipt of the DMM600, inspect the packaging and contents for damage. File damage claims with the shipping company. Immediately check package contents against the shipping documentation; the packing list is provided in Section 3.1, DMM600 Packing List. -
Page 8: Quickstart
DMM600 Duff Moisture Meter FIGURE 3-1. Ships with equipment Quickstart This section describes the process for getting a water content measurement. Information about the sensor components, using the software, and calibrating the sensor is located in Section 7, Operation. 1. Unscrew the compression knob completely and loosen (don’t remove) the chamber access thumbscrew. -
Page 9: Dmm600 Components
DMM600 Duff Moisture Meter Compression Knob Chamber Access Sample Thumbscrew Chamber Chamber Removal Thumbscrew Sample Chamber FIGURE 4-1. DMM600 components... -
Page 10: Duff Placed In Sieve
DMM600 Duff Moisture Meter 2. Place duff in the sieve and place the sieve atop the sample chamber (see FIGURE 4-2 and FIGURE 4-3). FIGURE 4-2. Duff placed in sieve FIGURE 4-3. Duff placed in chamber... -
Page 11: Turn Knob To Make Measurement
Turn the cap slightly clockwise and tighten the chamber access thumbscrew. 5. Flip the toggle switch on the bottom of the DMM600. Turn the compression knob clockwise until the double-beep audible signal indicates the measurement has been made (see FIGURE 4-4 and FIGURE 4-5). -
Page 12: Overview
Duff thickness and duff water content strongly influence duff consumption and soil heating during fires. The parts of the DMM600 include a cylinder that houses the electronics, a sample chamber, and an LCD readout. To measure duff water content, the... -
Page 13: Specifications
PCDMM allows downloading and uploading of calibration coefficients, checking battery voltage and resetting the DMM600. The DMM600 comes with a 7.5 cm (3 inch) diameter sieve, and a case for easy carrying and storage for small items including a spare battery, screwdriver and pencil. -
Page 14: Performance
Display End 7.3.1 Power Switch A toggle switch that turns the DMM600 on and off is on the bottom of the DMM600 next to the display. When the switch is toggled on, a single beep indicates the DMM600 is turned on. To conserve battery power, the DMM600 will automatically turn off after about 5 minutes of inactivity. -
Page 15: Display
7.3.4 Serial Port The DMM600 serial port is used for direct connection to the serial port of a computer using a 9-pin serial cable. The port should be kept covered with the plastic cover to protect from damage when not being used. PCDMM is the interface software. -
Page 16: Downloading Coefficients To Convert To Gravimetric Water Content
DMM600 Duff Moisture Meter The DMM600 presents water content measurement results in volumetric terms because that is what the DMM600 measures. Conversion to gravimetric requires knowledge of the material bulk density. Bulk density of duff tends to be similar for many forest types. If the bulk density of a particular material is known or measured, the displayed volumetric water content value is easily converted to gravimetric by adjusting the calibration coefficients. -
Page 17: Determining Duff Sample Bulk Density
Duff commonly varies in fragment size, and it may be necessary to grind or chop the material to improve measurement accuracy and repeatability. A #4 sieve is included with the DMM600 for this purpose. Forcing the sample material through the sieve will improve measurement accuracy and repeatability. -
Page 18: Calibration Equation
FIGURE 7-2. PCDMM user interface display 7.5.2 Calibration Equation The frequency output of the DMM600 is converted to water content using a calibration equation. The response of the DMM600 to changing water content is best described with a quadratic calibration equation. A factory calibration is part of the DMM600 operating system and will always be displayed. -
Page 19: Indicators
The left circle indicates which serial communications port is selected. The circle is green when the connection is successfully made. The TX circle is green during transmission from the computer to the DMM600. The RX circle is red during transmission from the DMM600 to the computer. -
Page 20: User Calibration
The calibration requires duff samples with a range of water contents. The collected sample will be measured with the DMM600, removed from the DMM600 and weighed, then dried and weighed. Water will be added to the samples to obtain samples with a range of water contents, and the measurement process repeated on the wetted samples. - Page 21 DMM600 Duff Moisture Meter sitting time will allow the water content to equilibrate throughout the sample. 2. Load a portion of the sample into the chamber and take a measurement. See Section 7.4.2, Duff Size and Water Content Heterogeneity, for discussion of sample heterogeneity.
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Page 22: Drying Samples And Calculating Volumetric Water Content
DMM600 Duff Moisture Meter Drying Samples and Calculating Volumetric Water Content 7.7.1 Conventional Oven Method For this method a thermostatically controlled oven is required and sample containers suitable for oven temperature of 105°C. Procedure 1. Weigh and record the weight of sample container 2. -
Page 23: Maintenance
DMM600 Duff Moisture Meter 6. Return the container with the sample to the oven, and reheat for 1 min. 7. Repeat steps 4 through 6, until the weight does not change. 8. Use the final weight determination in calculating the gravimetric water content. - Page 24 DMM600 Duff Moisture Meter...
- Page 26 Campbell Scientific Companies Campbell Scientific, Inc. (CSI) 815 West 1800 North Logan, Utah 84321 UNITED STATES www.campbellsci.com • info@campbellsci.com Campbell Scientific Africa Pty. Ltd. (CSAf) PO Box 2450 Somerset West 7129 SOUTH AFRICA www.csafrica.co.za • cleroux@csafrica.co.za Campbell Scientific Australia Pty. Ltd. (CSA)
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