Teledyne API Model 200AU NOX Analyzer Instruction Manual, 02293, Rev. F

Table 7-15: Definition of Level 1 and Level 2 Zero and Span Checks

(from Section 2.0.9 of Q.A. Handbook for Air Pollution Measurement Systems)

LEVEL 1 ZERO AND SPAN CALIBRATION

A Level 1 zero and span calibration is a simplified, two-point analyzer calibration used when analyzer linearity does not need to be checked or verified. (Sometimes when no adjustments are made to the analyzer, the Level 1 calibration may be called a zero/span check, in which case it must not be confused with a Level 2 zero/span check.) Since most analyzers have a reliably linear or near-linear output response with concentration, they can be adequately calibrated with only two concentration standards (two-point concentration). Furthermore, one of the standards may be zero concentration, which is relatively easily obtained and need not be certified. Hence, only one certified concentration standard is needed for the two-point (Level 1) zero and span calibration. Although lacking the advantages of the multipoint calibration, the two-point zero and span calibration--because of its simplicity--can be (and should be) carried out much more frequently. Also, two-point calibrations are easily automated. Frequency checks or updating of the calibration relationship with a two-point zero and span calibration improves the quality of the monitoring data by helping to keep the calibration relationship more closely matched to any changes (drifts) in the analyzer response.

LEVEL 2 ZERO AND SPAN CHECK

A Level 2 zero and span check is an "unofficial" check of an analyzer's response. It may include dynamic checks made with un-certified test concentrations, artificial stimulation of the analyzer's detector, electronic or other types of checks of a portion of the analyzer, etc.

Level 2 zero and span checks are not to be used as a basis for analyzer zero or span adjustments, calibration updates, or adjustment of ambient data. They are intended as quick, convenient checks to be used between zero and span calibrations to check for possible analyzer malfunction or calibration drift. Whenever a Level 2 zero or span check indicates a possible calibration problem, a Level 1 zero and span (or multipoint) calibration should be carried out before any corrective action is taken.

If a Level 2 zero and span check is to be used in the quality control program, a "reference response" for the check should be obtained immediately following a zero and span (or multipoint) calibration while the analyzer's calibration is accurately known. Subsequent Level 2 check responses should then be compared to the most recent reference response to determine if a change in response has occurred. For automatic Level 2 zero and span checks, the first scheduled check following the calibration should be used for the reference response. It should be kept in mind that any Level 2 check that involves only part of the analyzer's system cannot provide information about the portions of the system not checked and therefore cannot be used as a verification of the overall analyzer calibration.

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Teledyne 200AU instruction manual Definition of Level 1 and Level 2 Zero and Span Checks, Level 1 Zero and Span Calibration
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200AU specifications

The Teledyne 200AU is a cutting-edge analytical instrument designed primarily for trace and ultra-trace analysis of elements in various liquid samples. Renowned for its reliability and precision, this inductively coupled plasma mass spectrometer (ICP-MS) is widely utilized in environmental monitoring, food safety, clinical diagnostics, and geochemical research.

One of the distinguishing features of the Teledyne 200AU is its exceptional sensitivity, allowing for the detection of elements at concentrations as low as parts per trillion (ppt). This sensitivity is crucial for applications where even minute traces of contaminants can have significant implications. The instrument also boasts a wide dynamic range, accommodating high-concentration samples without compromising accuracy.

The Teledyne 200AU incorporates advanced technologies that enhance its analytical capabilities. At the core of its design is a robust ICP source, which ensures optimal ionization efficiency. The instrument also features a high-resolution quadrupole mass analyzer, which enables precise separation and identification of ions based on their mass-to-charge ratio. This feature is essential for distinguishing between isotopes and analyzing complex mixtures.

Another notable characteristic of the Teledyne 200AU is its user-friendly interface, which simplifies the operation and data management processes. The software is intuitive, offering sophisticated data processing algorithms that streamline analysis. Users can easily access real-time data visualization, facilitating timely decision-making based on analytical results.

The instrument is built with durability in mind, featuring a compact design that allows for easy integration into various laboratory environments. The Teledyne 200AU is also equipped with state-of-the-art safety features, including enhanced cooling systems and automated shutdown protocols to protect both the instrument and the user.

Moreover, the Teledyne 200AU supports a variety of sample introduction methods, including nebulization and laser ablation, providing flexibility to accommodate different types of samples and experimental needs. Its multi-element capability further enhances its versatility, allowing simultaneous detection of multiple elements in a single analysis.

In summary, the Teledyne 200AU stands out as a premier instrument in the field of mass spectrometry. Its combination of high sensitivity, advanced technology, user-friendly features, and robust design makes it an invaluable tool for scientists and researchers seeking precise elemental analysis across various disciplines.
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