Secondary Standard for Static Volume Measurement

The Secondary Standard for Static Liquid Volume Measurement (OE 036) ensures the traceability and accuracy of liquid volume measurements, which are critical in various industries, including energy, chemical processing, food and beverage production, healthcare, and trade.

Purpose and Significance

The volume of water, technical liquids, and consumables has always played a crucial role in the economy. With the increasing importance of energy resources, precise volume measurement is essential for:

• Standardizing the static volume measurement of technical liquids and consumables.
• Ensuring international comparability of static volume standards.
• Providing the necessary measurement uncertainty to meet industry requirements.

Standard Specification

The OE 036 Secondary Standard realizes the unit of liquid volume under conditions close to atmospheric pressure and a temperature of 20°C for a nominal volume of 20,000 mL, with an expanded uncertainty of 0.74 mL (k=2).

Components of the Secondary Standard for Static Volume Measurement

1. Calibration Device for Gravimetric Volume Determination

   • Uses the difference in mass between an empty and filled container.
   • Considers liquid density and buoyancy corrections to determine volume.

2. Standard Metal Measuring Container (20 L)

   • Designed for the calibration of lower-order volumetric standards using the volumetric method.

Measurement Principle

The gravimetric calibration method determines liquid volume based on:

• The weight difference between an empty and filled container.
• The density of the test liquid.
• Corrections for air buoyancy during weighing.

For the 20 L standard container, the volume-by-displacement method is used.

International Comparability and Compliance

• The measurement devices of SMU and ČMI meet the criteria for measurement consistency, as verified in a bilateral comparison in 2012.
• The evaluation of results confirms that both laboratories are qualified for the calibration and verification of static liquid volume measuring instruments.

Applications

• Calibration of reference volume standards.
• Verification of liquid measuring instruments in trade, industry, and scientific research.
• Ensuring accuracy and consistency in liquid volume measurements across various sectors.

This secondary standard plays a vital role in establishing measurement accuracy, supporting metrology laboratories, and ensuring international comparability in the field of static liquid volume measurement.