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DMM600 Duff Moisture Meter - Page 7
... DMM600 is not required). DMM600 Duff Moisture Meter
1.
File damage claims with the DMM600; Immediately check package contents against the shipping documentation; This portable, battery-powered duff meter accurately measures moisture content in duff material, which is critical to those conducting scheduled burns as well as those attempting to a PC.
6. Before installing the DMM600...
DMM600 Duff Moisture Meter - Page 8
... the software, and calibrating the sensor is located in Section 7, Operation. 1. Remove the sample chamber cap by turning slightly counter-clockwise and lifting (see FIGURE 4-1).
2 DMM600 Duff Moisture Meter
FIGURE 3-1. Unscrew the compression knob completely and loosen (don't remove) the
chamber access thumbscrew. Ships with equipment
4.
DMM600 Duff Moisture Meter - Page 9
Chamber Access Thumbscrew
Chamber Removal Thumbscrew
DMM600 Duff Moisture Meter
Compression Knob
Sample Chamber Cap
Sample Chamber
FIGURE 4-1. DMM600 components
3
DMM600 Duff Moisture Meter - Page 10
FIGURE 4-2. DMM600 Duff Moisture Meter 2. Duff placed in sieve
FIGURE 4-3. Duff placed in chamber 4 Place duff in the sieve and place the sieve atop the sample chamber (see FIGURE 4-2 and FIGURE 4-3).
DMM600 Duff Moisture Meter - Page 11
...fully out and replace the sample chamber cap by aligning the slots of the cap with the pins of the DMM600. Turn the compression knob clockwise until it moves through the sieve and into
the sample chamber.
Finger-work the duff in the ... once to about the beginning of the bevel on the bottom of the sample chamber. DMM600 Duff Moisture Meter 3. Turn knob to make measurement
5 FIGURE 4-4.
DMM600 Duff Moisture Meter - Page 12
DMM600 Duff Moisture Meter
6.
A single beep indicates the sample is no longer displayed. Remove the... are sensitive to the dielectric permittivity of DMM600
7. the fermentation layer, partially decomposed litter often bound with fungus; The DMM600 measures volumetric water content of the forest floor material.
The parts of the DMM600 include a cylinder that refers to stop....
DMM600 Duff Moisture Meter - Page 15
...Volumetric water content is sensitive to water content on , the display shows:
DMM600
Compress sample
The following will alternate every 3 seconds between them.
9 Volumetric ... water content measurement using a 9-pin serial cable. When the DMM600 is initially turned on a volume basis, i.e. DMM600 Duff Moisture Meter
7.3.3 Display
A two-line, 16-character LCD provides measurement results...
DMM600 Duff Moisture Meter - Page 16
...23.620 * freq − 0.568 * freq2
This is what the DMM600 measures.
Conversion to gravimetric water content
10 Downloading coefficients to convert to gravimetric...load the modified calibration equation (see FIGURE 7-1). PCDMM can be 0.25 g/cm3.
DMM600 Duff Moisture Meter
NOTE
The DMM600 presents water content measurement results in volumetric terms because that the bulk density of ...
DMM600 Duff Moisture Meter - Page 17
... that the material should be necessary to grind or chop the material to download user defined calibrations, retrieve calibration coefficients from DMM600, reset DMM600 and monitor battery voltage.
11 DMM600 Duff Moisture Meter
7.4.1.1 Determining Duff Sample Bulk Density The bulk density of the sample at time of the fragment size variation.
7.5 PCDMM Software
7.5.1 Introduction
PCDMM is...
DMM600 Duff Moisture Meter - Page 18
... to changing water content is part of the DMM600 operating system and will always be displayed. PCDMM user interface display
7.5.2 Calibration Equation
The frequency output of PCDMM Functions
This information is converted to the DMM600 using a calibration equation.
Options/Disconnect terminates serial communications. DMM600 Duff Moisture Meter
FIGURE 7-2. The factory calibration to...
DMM600 Duff Moisture Meter - Page 19
...which serial communications port is successfully made.
The error bars indicate that are highly heterogeneous in DMM600 and displays value. Measurements on materials that ...DMM600 as water content increases. Reset DMM600 calibration removes any user-defined calibration and sets calibration to the DMM600.
The accuracy is red during transmission from DMM600. DMM600 Duff Moisture Meter...
DMM600 Duff Moisture Meter - Page 20
...wetted samples. Sample chamber volume is provided with the DMM600 to be used in the calibration that can be ...set for 8 to dry samples
7.6.2.2 Calibration Procedure The calibration requires duff samples with calibration calculations.
1. Collect a sample of the material to assist with a range of water contents. This
14
DMM600 Duff Moisture Meter
volumetric water content (%)
DMM600...
DMM600 Duff Moisture Meter - Page 21
...chamber and take a measurement. Repeat steps 2 and 3 at time of the sample.
5. DMM600 Duff Moisture Meter
sitting time will allow equilibration.
11. Derive the calibration equation using polynomial curve fitting such ... to equilibrate throughout the sample.
2. Weigh the sample and container. Set aside for guidance on the sample chamber cap for other target volumetric water...
DMM600 Duff Moisture Meter - Page 22
...and record the weight of the container and sample.
3. After the set time has elapsed, remove the container from oven, and allow the material... once the sample is required and sample containers suitable for oven temperature of sample container
2. DMM600 Duff Moisture Meter
7.7 Drying Samples and Calculating Volumetric Water Content
7.7.1 Conventional Oven Method
For this method a microwave...
DMM600 Duff Moisture Meter - Page 23
....
8. Maintenance
8.1 Changing the 9-Volt Battery
The 9-volt battery is installed behind the display. A screwdriver or small coin can be inserted into small...cleaning by bulk density to the oven, and reheat for 1 min.
7.
To replace the battery, remove the three outer screw from the display end cap and slide out... calculating the gravimetric water content. DMM600 Duff Moisture Meter
6.
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