Campbell Scientific DMM600 Duff Moisture Meter - Manual (Page 23)

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.
Calculation of gravimetric water content of the sample using 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.
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 edge of the cylinder to assist separation.
8.2 Cleaning the Sample Chamber
The sample chamber can be removed for cleaning by removing the chamber
removal thumbscrew and rotating the sample chamber slightly counter-
clockwise.
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