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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 , I n c .

Содержание DMM600

Страница 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 I n c ...

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Страница 3: ...removing reinstalling and shipping defective products to Campbell Campbell will return such products by surface carrier prepaid within the continental United States of America To all other locations Campbell will return such products best way CIP Port of Entry INCOTERM 2010 prepaid This warranty shall not apply to any products which have been subjected to modification misuse neglect improper servi...

Страница 4: ...ng 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 Statement of Product Cleanliness and Decontamination form and comply with the requirements specified in it The form is available from our web site at www campbellsci com repair A completed form must be either emailed to repa...

Страница 5: ... 7 3 1 Power Switch 8 7 3 2 Audible Indicator 8 7 3 3 Display 9 7 3 4 Serial Port 9 7 4 Water Content Measurement 9 7 4 1 Gravimetric and Volumetric Water Content 9 7 4 1 1 Determining Duff Sample Bulk Density 11 7 4 2 Duff Size and Water Content Heterogeneity 11 7 5 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...

Страница 6: ...ing the 9 Volt Battery 17 8 2 Cleaning the Sample Chamber 17 Figures 3 1 Ships with equipment 2 4 1 DMM600 components 3 4 2 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 DMM600 standard calibration 14 ...

Страница 7: ...n 4 Quickstart 2 Cautionary Statements The DMM600 is a precision instrument Please handle it with care 3 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 Contact Campbell Scienti...

Страница 8: ...ntent 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 Remove the sample chamber cap by turning slightly counter clockwise and lifting see FIGURE 4 1 2 ...

Страница 9: ...DMM600 Duff Moisture Meter Compression Knob Chamber Access Thumbscrew Sample Chamber Cap Chamber Removal Thumbscrew Sample Chamber FIGURE 4 1 DMM600 components 3 ...

Страница 10: ...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 4 ...

Страница 11: ...r the compression piston may bind 4 Remove the sieve Ensure that the compression knob is fully out and replace the sample chamber cap by aligning the slots of the cap with the pins of the sample chamber 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 sign...

Страница 12: ...ter content of organic forest floor material It is a portable battery powered device that uses measurement methods that are sensitive to the dielectric permittivity of the material being measured The dielectric permittivity is strongly dependent on the water content of the forest floor material The forest floor can contain several kinds of organic material including a litter layer the recognizable...

Страница 13: ...and provides an interface using serial communications 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 6 Specifications Features Measures duff water content in the field Com...

Страница 14: ... board containing a waveguide attached to piston A high frequency signal is coupled to the waveguide from the electronics in the main cylinder The presence of water in the sample determines the response of the circuit which is converted to water content using a calibration equation The waveguide is attached to a piston which moves against precision springs to obtain correct compression of sample 7...

Страница 15: ...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 7 4 Water Content Measurement 7 4 1 Gravimetric and Volumetric Water Content The DMM600 is sensitive to water content on a volume basis i e volumetric water content Volumetric water c...

Страница 16: ...termined to be 0 25 g cm3 The calibration equation to convert circuit output frequency to volumetric water content is VolumetricWaterContent freq freq 5288 5905 0142 2 To convert to gravimetric water content each calibration equation coefficient is divided by the bulk density Applying for this example gives GravimetricWaterContent freq freq 21152 23620 0568 2 This is not a general calibration equa...

Страница 17: ... of the water content for the area of interest 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 The heterogeneity of material size can be characterized by...

Страница 18: ...ry calibration to convert frequency MHz to volumetric water content is VolumetricWaterContent freq freq 5288 5905 0142 2 User derived calibrations are easily loaded to the DMM600 using PCDMM The coefficients from the calibrations are entered into the appropriate box then Send Calibration button is used to transfer the values to the DMM600 7 5 3 Description of PCDMM Functions This information is al...

Страница 19: ...on name and calibration coefficients from DMM600 Read Battery Voltage reads voltage of 9 volt battery in DMM600 and displays value Reset DMM600 calibration removes any user defined calibration and sets calibration to factory default 7 6 Calibration 7 6 1 DMM600 Standard Calibration FIGURE 7 3 shows the response of the DMM600 as described using the standard calibration that was derived by Campbell ...

Страница 20: ...nge 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 Spreadsheet file DMM600 calibration spreadsheet xls is provided with the DMM600 to assist with calibration calculations 1 ...

Страница 21: ...nd Calculating Volumetric Water Content for guidance on drying samples 6 Using the dried samples repeat steps 2 through 4 The dried sample measurements are zero water content values 7 Use the following equation to calculate volume of sample at time of measurement Volume rotations 157 97 7 25 8 Calculate the bulk density g cm3 by dividing the dry weight of the sample by the volume 9 Estimate the am...

Страница 22: ...ng spreadsheet or as follows water content massof container and wet sample massof container and dry sample massof container and dry sample massof container 100 Multiply gravimetric water content by bulk density to obtain volumetric water content 7 7 2 Microwave Oven Method For this method a microwave oven is required and sample containers suitable for use in microwave oven Procedure 1 Weigh and re...

Страница 23: ...and dry sample massof container 100 Multiply gravimetric water content by bulk density to obtain volumetric water content 8 Maintenance 8 1 Changing the 9 Volt Battery The 9 volt battery is installed behind the display To replace the battery remove the three outer screw from the display end cap and slide out of the main cylinder A screwdriver or small coin can be inserted into small slots on the e...

Страница 24: ...DMM600 Duff Moisture Meter 18 ...

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Страница 26: ...entific Canada Corp CSC 11564 149th Street NW Edmonton Alberta T5M 1W7 CANADA www campbellsci ca dataloggers campbellsci ca Campbell Scientific Centro Caribe S A CSCC 300 N Cementerio Edificio Breller Santo Domingo Heredia 40305 COSTA RICA www campbellsci cc info campbellsci cc Campbell Scientific Ltd CSL Campbell Park 80 Hathern Road Shepshed Loughborough LE12 9GX UNITED KINGDOM www campbellsci c...

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