TM-85 Type A and Type B Density and Specific Gravity MetersProvided by Shanghai Shupei Experimental Equipment Co., Ltd., commonly used in environmental testing, soil and other industries, with complete product specifications and exquisite packaging. Customers are welcome to purchase

TM-85 Type A and Type B Density and Specific Gravity MetersProduct Introduction:

Name: Soil Density Meter, Soil Specific Gravity Meter

Essence: The product uses natural moisture content soil samples

Correction method:

1： Dispersant correction
After adding a dispersant to the suspension during the experiment, the density of the suspension changes. Therefore, dispersant calibration is also required in the reading of the densitometer. The correction value of dispersant is recorded as.

2： Temperature correction
The scale of the densitometer is the suspension density (or soil particle mass) measured at 20 ℃. When the temperature changes, the suspension density will change, so temperature correction is required. The temperature correction value is a function of temperature and is also related to the type of densitometer.

3： Meniscus correction
The density meter reading measured earlier is the highest point reading of the meniscus at the suspension temperature of ℃, as shown in Figure 4-3. The highest point of the meniscus in the figure is, and the actual suspended liquid surface is a point. The distance between them is caused by the meniscus, so it needs to be corrected by the meniscus. The correction value of the meniscus is recorded as (or the specific gravity of type A is recorded as), which is the reading of the point at time. The method for measuring the correction value of the meniscus is to place the densitometer in clean water at the same temperature as the suspension, read the highest point reading and the parallel point reading with the liquid surface, and calculate the correction value of the meniscus from this

Product Specification Introduction Table:

Product Instructions:

Usage method of soil specific gravity meter:
If it is found after the completion of the experiment that the sinking soil particles have exceeded 15% of the total soil mass after * readings, the soil in the measuring cylinder should be washed and sieved with a 0.075mm analysis sieve, and then the particle size analysis test of coarse-grained soil larger than 0.075mm should be carried out according to the sieve analysis method.
1： The density meter method is suitable for conducting particle analysis tests using natural moisture content soil samples. Dried soil samples can also be used for drying;
2： For air dried (dried) soil samples, take a representative soil sample of 100-300g, place it in a mortar, and use a pestle with a rubber head to grind and disperse it. Sift the dispersed soil through a 2mm sieve, then grind the soil onto the sieve and sieve it again until only particles larger than 2mm are left on the sieve;
3： Mix the soil sample with a particle size less than 2mm evenly, and weigh the soil sample with the mass of soil particles as the sample. When using a soil sample with a natural moisture content of, calculate the required wet soil mass according to the following formula: （4-10）
4： Pour the prepared sample into a triangular flask, inject approximately 200cm3 of pure water, soak for more than 18 hours, and directly perform particle analysis tests on natural moisture content soil samples without soaking or with shortened soaking time. After shaking slightly, boil it on a sand bath. Starting from boiling, record the time. Clay and soil that are not easily dispersed should be boiled for about 1 hour, while other soils should be boiled for no less than 0.5 hours;
5： After cooling the sample, pour it into the graduated cylinder used for particle size testing. Wash the soil in the beaker and pour it all into the graduated cylinder. Add 10cm3 of dispersant (4% sodium hexametaphosphate, 6% hydrogen peroxide, or 1% sodium silicate), and then add water to 1000cm3;
6： Use a mixer to stir up and down the entire depth of the suspension in a measuring cylinder for about 1 minute, reciprocating 30 times each to ensure even distribution of soil particles in the suspension;
7： Remove the mixer and start the stopwatch to measure the density readings at 1, 2, 5, 15, 30, 60, 120, and 1440 minutes. Instructions for using soil specific gravity meter:
Type B densitometer is referred to as, and Type A densitometer is referred to as. Place the densitometer into the measuring cylinder about 15 seconds before each measurement, and remove the densitometer after reading. When reading, pay attention that the float of the density meter should not be close to the wall of the measuring cylinder, and the reading should be the highest point of the meniscus climb. Grade A densitometer estimates to 0.1, Grade B densitometer estimates to 0.0001. Measure the suspension temperature after reading, accurate to 0.5 ℃;