Hydrometer is a specialized device used quite commonly in laboratories. However, do you have a clear understanding of the use and how to measure the hydrometer properly? Let’s go to Hiep Phat’s article below to better understand this specialized device.

1. What is a hydrometer?

Hydrometer is a very important laboratory instrument, often used to measure specific gravity and density. , or determine the concentration (salinity, sweetness, alcohol,…).

This is an indispensable tool in laboratories, companies or factories that produce alcoholic beverages, etc. They are calibrated and graduated with a or more scales like specific gravity.

Densometer scale is divided into 5 types:

• Gravity API: A type of hydrometer commonly used in the oil and gas industries.
• Baume scale: Commonly used in the chemical and pharmaceutical industries.
• Brix scales: Mostly used in fruit juice, wine and sugar industries
• Plato scale: Used in brewing
• Twaddell scale: Used in bleaching and dyeing industries

2. Hydrometer classification

Classify by features

Mechanical hydrometer: Just put the device into the solution to be determined, wait for the device to equilibrate to read the measurement results. Simple operation, easy to operate.

Desktop electronic hydrometer: Place the sample of the solution to be measured in the sample holder of the meter, wait a few seconds for the reading to be read. town. Operated by electronic circuit.

Classified by use

Sea water hydrometer (Salinity hydrometer): An instrument used to quickly determine the salinity of seawater. quick, easy.

Alcohol hydrometer: This is a device used to determine the alcohol content of wine or fruit juice, widely used today. .

3. Working principle

Hydrometer works on the principle of Acsimet thrust

This principle holds that a solid body in a liquid will float thanks to a force equal to the part of the liquid displaced by the submerged part of the solid, usually has the same direction and opposite direction with respect to gravity.
The higher the liquid density, the more the density index of the given weight will increase. Conversely, the lower the liquid density, the lower the density index of the given weight will be.

When in gasoline, kerosene, alcohol, the hydrometer will sink deeper. And when in salt water, milk, acid, the hydrometer will float more.

4. Hydrometer Application

Hydrometer is a type of laboratory instrument used to measure specific gravity which is highly dependent on temperature.

Instrument, this instrument can only measure coolant/antifreeze for Ethylene Glycol. Propylene Glycol cannot be measured with a hydrometer due to the fact that concentrations up to 70% specific gravity increase, but above 70% specific gravity decreases. 100% solution reads up to 40% accuracy.

Sampling technique is very important in density measurement. Air bubbles in the sample will cause inaccurate readings. The float must be kept from touching the sides of the hydrometer.

Hydrometer is made of glass. The standard measuring temperature of hydrometer is 20 degrees Celsius. Total length 300 – 320mm.

5. How to measure density with a hydrometer

Pour liquid slowly into tall container, preferably graduated flask. This flask must be placed on a smooth, non-shaking surface.

Place the hydrometer gently inside the liquid, until the density is balanced, stop moving inside the liquid.

The position where the liquid surface comes in contact with the body of the instrument will be relative to the relative density or to the result to be measured. Depending on the correlation with the density of that liquid, the hydrometer will take any value.

6. Popular hydrometers provided by Hiep Phat

Kruss from Germany is one of the leading hydrometer suppliers today, especially electronic hydrometers, hydrometers. The line of desktop electronic hydrometers of Kruss provided by Hiep Phat includes 2 Models DS7700 and DS7800, divided into 5 sets, to meet the needs of customers:

Manually Measure Set 1

BillionTtrong Ke  Manual Sample Measurement Kruss Set 1 is the perfect solution for manual sample delivery via syringe, especially for low sample volume and high viscosity sample.

While the template is added, you can check for air bubbles by looking through the inspection glass. A suitable medium is injected for cleaning until all sample residues have been dissolved and removed. The drying unit then removes all liquid residue.

Manual measure Set 2

BillionTtrong Ke  Manual Sample Measurement Kruss Set 2 is the perfect solution for manual sample delivery via syringe, especially for samples with high viscosity and corrosiveness.

While the template is added, you can check for air bubbles by looking through the inspection glass. A suitable medium is injected for cleaning until all sample residues have been dissolved and removed. The drying unit then removes all liquid residue.

Semi-automatic sample measurement Set 3

BillionTtrong Ke Semi-Automatic Sample Measurement Kruss Set 3 generally used in the case of low to slightly viscous samples.

With a peristaltic pump equipped, the Kruss Set 3 Semi-Automatic Sample Hydrometer can perform semi-automatic sample feeding and tube oscillator cleaning U easily.

This practice is more efficient and safer in the analysis of toxic or highly corrosive samples. It also improves the reproducibility of measurement results.

Automatic sample measurement Set 4

BillionTtrong Ke  Automatic Sample Measurement Kruss Set 4 with AS80 and AS90 autosampler, it is the perfect solution when measuring samples with high sample throughput. All processes from sample delivery to cleaning and drying are fully automated.

Additionally, together with the DS7070 peristaltic pump, the Kruss Set 4 Hydrometer Series allows unattended measurements of up to 89 samples.

Automatic sample measurement Set 5

BillionsTtrong Ke  Automatic Sample Measurement Kruss Set 5 with AS80 and AS90 autosampler, it is the perfect solution when measuring samples with high sample throughput. All processes from sample delivery to cleaning and drying are fully automated.

Additionally, together with the DS7070 peristaltic pump, the Kruss Set 5 Hydrometer Series allows unattended measurements of up to 89 samples. In particular, Set 5 will often be preferred for highly corrosive samples.

Model DS7700 and DS7800 Kruss spec sheet:

7. Where to buy hydrometer?

Hiep Phat Equipment Co., Ltd is a unit specializing in importing and distributing hydrometers and density meters from manufacturers. Kruss – Germany. At Hiep Phat, you can find a wide range of density meters with many different functions and applications to suit your needs.

Besides, with a team of experienced and qualified staff, Hiep Phat is always ready to help customers if they encounter any problems during the process. product usage.

Hiep Phat will also support delivery, use instructions and have warranty and maintenance policies suitable for customers who buy our products.

Hopefully through this article, you have been able to better understand the concept of hydrometer and how to measure density properly. If you are looking to buy all kinds of desktop electronic hydrometers, hydrometers, or have any questions in the process of using hydrometers, do not hesitate to contact Hiep Phat via Hotline: (028) 6287 4765 or Email: sales @thietbihiephat.com to receive timely advice.