Campbell DMM600 Instrukcja Obsługi Pobierz pdf (Strona 16)

DMM600 Duff Moisture Meter

11. Repeat steps 2 through 8.

12. Repeat steps 9 through 11 for other target volumetric water contents to

provide a range of calibration water contents.

13. Derive the calibration equation using polynomial curve fitting such as the

trendline function of Microsoft Excel.

7. Maintenance

7.1 Changing the 9-Volt Battery

The 9-volt battery is installed behind the display. To replace the battery,

remove the 3 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. Drying Samples and Calculating Volumetric Water

Content

8.1 Conventional Oven Method

For this method a thermostatically controlled oven is required and sample

containers suitable for oven temperature of 105°C.

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 drying oven and dry at 105°C for 12

to 16 hours or until sample weight does not decrease with drying time.

4. Remove sample from oven and allow the material and container to cool to

room temperature. Determine and record the weight of the dried sample

and the container using the same balance.

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 containerand drysample massof container

−











 *100

Multiply gravimetric water content by bulk density to obtain volumetric water

content.

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Campbell DMM600 Instrukcja Obsługi Strona 16