Campbell DMM600 Bedienerhandbuch PDF herunterladen (Seite 7)

DMM600 Duff Moisture Meter

FIGURE 1. DMM600

3.1 Sample Chamber

The sample chamber holds the sample during measurement. The sample

chamber is accessed by loosening the chamber access thumbscrew, rotating the

sample chamber cap slightly counter-clockwise and lifting the cap away from

the sample chamber.

A piston located inside the cap is attached to the compression knob by a

threaded shaft. With the sample in the sample chamber, the compression knob

is turned to compress the sample for measurement. The knob is also used to

relax the sample for removal.

The bottom of the sample chamber is a printed circuit 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.

The sample chamber can be removed for cleaning by removing the chamber

removal screw and rotating the sample chamber slightly counter-clockwise.

3.2 Electronics

The electronics are housed inside the main cylinder of the DMM600. The

electronics for the measurement are located below the sample chamber, and the

electronics for display and serial communications are located behind the

display.

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Campbell DMM600 Bedienerhandbuch Seite 7