AZA 0862 PLUMMET BALANCE

Description

Plummet Balance for Soil Specific Gravity Test – Azalab

The Plummet Balance is a specialized laboratory apparatus used to determine the specific gravity of soil solids, particularly fine-grained soils that do not retain their structure in air-dry conditions. The test is critical for geotechnical engineers and soil analysts and is commonly conducted in tandem with sedimentation or hydrometer analyses.

At Azalab, our plummet balance set complies with ASTM D854 and IS 2720 (Part 3) standards. It ensures high precision by minimizing reading errors, especially when assessing clay and silt-dominated soil samples. It’s an ideal solution for determining specific gravity when conventional pycnometer methods are not suitable.

How the Plummet Balance Works:

The device consists of a counterweighted balance beam with a plummet (metal bob) suspended into a liquid medium (usually distilled water). The test involves immersing the plummet in a soil suspension, measuring the apparent weight, and using calibrated scales to derive the specific gravity of soil particles.

Conventionally particle size distribution analysis is carried out using pipette and hydrometer methods. Whereas in hydrometer method it is possible to determine particle sizes in the range 75microns, the method involves computation and it is time consuming. The pipette method can be used for determining only the percentage of specific sizes less than 0.02, 0.006 and 0.002mm as a percentage
of total soil sample.
The plummet balance method to determine sub sieve particle size for the entire range is very rapid and only manipulation of height of the balance, so that plummet sinks to the right depth is required. The percentage of soil in suspension is directly indicated by a pointer over a graduated scale.
A vertical rod is mounted on a sturdy base having leveling screws. A pointer with steel pivots turns is jewel bearing an moves over a graduated scale. Scale graduations are market 0-100% x 2%
To the other end of the pointer a plummet is hanged. Rack and pinion arrangement is provided on the vertical rod for adjusting the height. Supplied with a chart showing relationship between “K” and temperature of suspension of soils of varying specific gravity from 2.4 to 2.8 to help in solving stroke’s equation. Supplied complete with one Perspex plummet one measuring jar and one rider weight for zero adjustment and rider weight for adjusting the pointer to 100%.

The Plummet Balance from Azalab is a must-have for geotechnical labs, civil engineering institutes, and construction quality control departments. Whether you’re conducting sedimentation tests or assessing the basic physical properties of soil, this balance provides repeatable, standardized, and user-friendly testing.

Order your plummet balance today and ensure accurate specific gravity data for your projects and research. AZALAB

This method provides reliable results for dispersed soils, especially those used in hydrometer tests, making it indispensable for soil classification and fine particle behavior analysis.

What’s Included in the Set:

• Plummet balance with scale pointer
• Stainless steel or brass plummet (bob)
• 500 ml glass beaker
• Counterweight and adjustable arm
• Instruction manual with test procedure and example calculations

Applications:

• Soil Mechanics Testing: For specific gravity of fine-grained soils
• Geotechnical Investigations: Input data for settlement and stability analysis
• Construction Material Testing: For soil suitability and mix design
• Educational & Research Labs: Standard geotechnical practicals
• Environmental & Agricultural Soil Science

Specifications Table

Frequently Asked Questions (FAQ):

Q1: What is the function of the plummet balance?
A: It is used to determine the specific gravity of soil particles suspended in water, especially where air-drying the soil may alter results.

Q2: How accurate is the test compared to the pycnometer method?
A: The plummet balance is equally accurate for fine-grained soils and is often preferred when the sample is difficult to dry or disperse.

Q3: Does the set include a calibration certificate?
A: Calibration certificates can be provided on request for institutional or regulatory compliance.

Q4: Is the equipment portable for field use?
A: Yes, the balance is compact and light enough for both laboratory and field setups.

Q5: Can I use it for coarse-grained soils?
A: It is specifically designed for fine-grained soils (clay, silt). For coarse aggregates, pycnometers or gas pycnometers are recommended.