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Related Concept Videos

Instrument Calibration01:12

Instrument Calibration

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Instrument calibration is essential for ensuring that instruments produce accurate and consistent results. It is vital in manufacturing, healthcare, testing laboratories, and scientific research. Calibration processes are specific to each instrument and help enhance data accuracy. Each instrument has a unique calibration process tailored to its design and function to improve data accuracy.
Analytical Balance Calibration
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Mass Analyzers: Overview01:13

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The mass analyzer is a crucial component of the mass spectrometer. In the ionization chamber, the vaporized sample is bombarded with a high-energy electron beam to generate a radical cation and further fragment into neutral molecules, radicals, and cations. A series of negatively charged accelerator plates accelerate the cations into the mass analyzer. The mass analyzer separates ions according to their mass-to-charge (m/z) ratios and then directs them to the detector. The common types of mass...
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The resolution of a mass spectrometer depends on the efficiency of separating ions with different ion masses. The mass of an atom is approximated to the sum of the masses of protons and neutrons inside, considering the masses of protons and neutrons as equal. However, the masses of the proton (1.6726 × 10−24 g) and neutron (1.6749 × 10−24 g) are not truly equal. There is a minor error in the expression of atomic masses relative to the simplest atom of hydrogen. For...
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The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
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Counting is the type of measurement that is free from uncertainty, provided the number of objects being counted does not change during the process. Such measurements result in exact numbers. By counting the eggs in a carton, for instance, one can determine exactly how many eggs are there in the carton. Similarly, the numbers of defined quantities are also exact. For example, 1 foot is exactly 12 inches, 1 inch is exactly 2.54 centimeters, and 1 gram is exactly 0.001 kilograms. Quantities...
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A 30 kg Capacity High Precision Load Cell Mass Comparator.

Randall M Schoonover1

  • 1National Bureau of Standards, Washington, DC 20234.

Journal of Research of the National Bureau of Standards (1977)
|September 27, 2021
PubMed
Summary
This summary is machine-generated.

Simple methods create a 30 kg mass comparator using a standard load cell. This device achieves high precision measurements at 1 part per million (ppm).

Keywords:
Constant loadinghigh precisionload cellmass comparatorsubstitution weighingweighing

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Area of Science:

  • Metrology
  • Measurement Science
  • Instrumentation Engineering

Background:

  • Accurate mass comparison is crucial for scientific and industrial applications.
  • Existing high-precision mass comparators can be complex and expensive.

Purpose of the Study:

  • To describe a simple and cost-effective method for fabricating a high-precision mass comparator.
  • To demonstrate the performance of a mass comparator built with readily available components.

Main Methods:

  • Fabrication of a 30 kg mass comparator utilizing an ordinary direct reading load cell.
  • Integration of the load cell into a stable mechanical structure designed for mass comparison.

Main Results:

  • The developed mass comparator successfully measures masses up to 30 kg.
  • Achieved a measurement precision of 1 part per million (ppm).

Conclusions:

  • Simple fabrication methods can yield high-precision metrological instruments.
  • Direct reading load cells are suitable for constructing accurate mass comparators.