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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.
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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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Atomic Absorption Spectroscopy: Instrumentation01:22

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An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
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Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

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Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
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Atomic Emission Spectroscopy: Instrumentation01:22

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The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
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Split Point Analysis and Uncertainty Quantification of Thermal-Optical Organic/Elemental Carbon Measurements
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Direct Reading Particle Counters: Calibration Verification and Multiple Instrument Agreement via Bump Testing.

John Jankovic1, Tracy L Zontek, Burton R Ogle

  • 1a Consultant, Center for Nanophase Materials Sciences, Oak Ridge National Laboratory , Oak Ridge , Tennessee.

Journal of Occupational and Environmental Hygiene
|January 28, 2015
PubMed
Summary

Annual calibration of condensation particle counters is insufficient. A new method, "bump testing," uses a spark igniter to verify instrument performance between calibrations, ensuring reliable particle measurements.

Keywords:
air monitoringcalibrationcondensation particle counternanoscale material

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Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Instrument Calibration

Background:

  • Direct reading instruments, such as condensation particle counters, are crucial for monitoring particle concentrations.
  • Annual manufacturer recalibration revealed frequent out-of-tolerance readings for two condensation particle counters.
  • Reliance solely on annual calibration does not guarantee consistent operational readiness.

Purpose of the Study:

  • To evaluate the sufficiency of annual calibration for condensation particle counters.
  • To develop and validate a method for confirming instrument operational readiness between calibrations.
  • To establish a reliable verification procedure for particle measurement instruments.

Main Methods:

  • Analysis of historical calibration records for two condensation particle counters.
  • Development of a 'bump testing' method using a reproducible spark igniter particle generation system.
  • Establishing a reference response using a newly calibrated instrument and subsequently comparing performance.

Main Results:

  • Both examined condensation particle counters spent more time out of tolerance than within tolerance during annual recalibrations.
  • The spark igniter system proved reproducible and suitable for calibration verification.
  • The developed bump testing method provides a means to confirm instrument performance between scheduled calibrations.

Conclusions:

  • Annual calibration alone is inadequate for ensuring reliable instrument performance.
  • Bump testing offers a practical and effective solution for verifying condensation particle counter readiness.
  • Periodic bump testing enhances confidence in particle measurement data throughout the calibration year.