DIN – ASTM – ISO Standards

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A hydrometer is a standardized and precise instrument used for measuring density, mass density, and concentration of various liquids. These instruments are designed and manufactured in compliance with international standards such as DIN 12791, ASTM E100, and ISO 649, and are considered essential equipment in industrial, research, and quality control laboratories.

Main Applications of Laboratory Hydrometers

• Measurement of density and concentration of liquid solutions
• Quality control of petroleum products, fuels, oils, and solvents
• Assessment of water quality, wastewater, and chemical solutions
• Food, beverage, and pharmaceutical industries
• Standard testing and analytical laboratories
• Calibration units and reference measurements

Types of Hydrometers Based on Manufacturing Standards

1. DIN 12791 Standard Hydrometers

Manufactured in strict accordance with DIN regulations, this series is ideal for laboratories where high accuracy and repeatability are critical.

Features

• Wide measurement ranges for various liquids (0.600 to 2.000 g/cm³)
• Uniform, high-contrast scale graduation
• Fine accuracy (0.0005 to 0.005 g/cm³)
• Suitable for calibration and standardized measurements
• Manufactured in Germany / European Union

2. ASTM E100 Standard Hydrometers

Specifically designed for oil, gas, fuel, and petroleum derivative industries.

Advantages

• Scales available in density, API gravity, and Baumé
• Widely used in refineries and petroleum laboratories
• High accuracy and long-term stability in accordance with ASTM requirements

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3. Hydrometers Without Integrated Thermometer

Suitable for measurements performed under controlled temperature conditions.

Characteristics

• Lightweight design
• Simplified construction
• Ideal for liquids with low temperature sensitivity

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4. Hydrometers with Integrated Thermometer

Designed for liquids with significant temperature dependence.

Characteristics

• Simultaneous measurement of density and temperature
• Integrated, easy-to-read scale
• Particularly suitable for food, pharmaceutical, and chemical industries

General Technical Specifications

• Body material: Laboratory-grade borosilicate glass
• Standard length: 300–350 mm
• Body diameter: 16–25 mm
• Reference temperature: Typically 20°C
• High-precision, clear scale graduation
• Wide measurement ranges for light to heavy liquids
• Available with Certificate of Conformity
• Country of manufacture: Germany / European Union / USA (depending on model)

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Guide to Selecting the Appropriate Hydrometer

1. Standard Selection (DIN / ASTM / ISO)

Determined by the application type and industry requirements.

2. Density Range

Select a range appropriate for the specific liquid being measured.

3. Graduation Resolution

Available resolutions include:
0.0005 – 0.001 – 0.002 – 0.005 g/cm³

4. Integrated Thermometer Requirement

Chosen based on the temperature sensitivity of the liquid.

5. Body Length and Diameter

Selected according to the test vessel dimensions and sample volume.

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Advantages of Purchasing from Our Organization

• Supply of the latest and most accurate standard hydrometers
• Complete model availability for diverse laboratory requirements
• Provision of certificates of authenticity and conformity
• Expert technical support for selecting the appropriate model
• Suitable for quality control, industrial, and research laboratories