Campbell DMM600 Manuale delle Istruzioni Scaricare il pdf (Pagina 17)

DMM600 Duff Moisture Meter

8.2 Microwave Oven Method

For this method a microwave oven is required and sample containers suitable

for use in microwave oven.

Procedure

1. Weigh and record the weight of sample container

2. Place the sample in the container and record the weight of the container

and sample.

3. Place the container with sample in the microwave oven with the heat sink

and turn the oven on for 3 min. The heat sink can be a cup of water

covered with a paper towel. The heat sink absorbs microwave energy

once sample are dry.

4. After the set time has elapsed, remove the container with from the oven.

Allow to cool to allow handling then weigh and record the weight.

5. Carefully stir the sample, taking special precautions not to lose any.

6. Return the container with sample to the oven and reheat in the oven for 1

min.

7. Repeat steps 4 through 6, until 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 sam ple massof container

−











 *100

Multiply gravimetric water content by bulk density to obtain volumetric water

content.

1 2 ... 12 13 14 15 16 17 18 19 20

Nessun commento

Campbell DMM600 Manuale delle Istruzioni Pagina 17