Secondary calibrator

The precision rotameter is a secondary calibration device. If it is to be used in place of a primary device such as a bubble meter, care must be taken to ensure that any introduced error will be minimal and noted. The precision rotameter may be used for calibrating the personal sampling pump in lieu of a bubble meter provided it is (a) Calibrated with an electronic bubble meter or a bubble meter, (b) Disassembled, cleaned as necessary, and recalibrated. It should be used with care to avoid dirt and dust contamination which may affect the flow, (c) Not used at substantially different temperature and/or pressure from those conditions present when the rotameter was calibrated against the primary source, (d) Used such that pressure drop across it is minimal. If altitude or temperature at the sampling site are substantially different from the calibration site, it is necessary to calibrate the precision rotameter at the sampling site where the same conditions are present. 

This "secondary" molecular weight calibration curve was fit to a polynomial over the retention volume range of the sample. Then the molecular weight distribution statistics are calculated from this "secondary" calibration curve and the DRI trace of the sample under... 

The complete traceability chain as presented here is valid only for those measurable quantities, which can have a value, expressed in SI units. When primary or secondary calibrators are not available the traceability chain for many measurands in laboratory medicine ends at a lower level, e.g. at the manufacturer s standing measurement procedure. In a situation where a manufacturer detects a new diagnostic marker and defines the measurable quantity by establishing a measurement procedure for this marker, the manufacturer s measurement procedure will form the top of the traceability chain. Nevertheless even in this simple situation the principles of the traceability concept are applicable. 

ACL or manufacturer Secondary calibrator Manufacturer Secondary calibrator... 

The analyzer must be calibrated before the first assays of samples are performed. Calibration must be done by the user. The requisite calibration materials (secondary calibrators) are available from Kodak. The declared calibrator values have been obtained by complicated and costly methods (partly... 

The test strips or slides cannot be calibrated with aqueous solutions (primary calibrator). This is because the matrix of the sample and of the primary calibrator is not the same. Calibration with so-called secondary calibrators is an alternative. The concentration or activity of the intended analyte is determined by chemical, enzymatic, physical or immunological analysis in any case it should be obtained by the best available method. 

Solutions 1, 2 and 3, as given in Table 1, are required to establish the relative sensitivity of the calcium electrode and should be used to establish secondary calibration solutions. Solutions 2 and 3 differ by a decade. In principle the primary reference solutions should not contain buffer. 

The reference method should be used to evaluate routine methods for measurement of ionized calcium in plasma. Routine methods are based on a cell similar to that of the reference method and are usually calibrated with secondary calibration solutions. These are aqueous buffer solutions to which values of ionized calcium concentration have been assigned by means of the routine instrument using the primary calibration solutions as reference material. Routine method often produce highly precise, but not necessary accurate ionized calcium data because of variations in electrode systems, liquid/liquid junctions, calibration and measurement procedures. In order to monitor the inaccuracy of routine ionized calcium measurements, it is necessary to employ quality control solutions, e.g., plasma samples for which the ionized calcium value have been established with the reference method. 

DATA REDUCTION. Data reduction technique is more or less standard. A strip chart record, for instance, would be reduced by first determining the span that resulted from the secondary calibration. At any point of interest in the... 

Reference material Protein containing primary standards or secondary calibrators such as Du Pont Elevated Chemistry Control (Cat. 790035903) and Normal Chemistry Control (Cat. 790035905)9. 

The precision rotameter. Figure 8 is a secondary calibration device. If it is to be used in place of a primary device such as a bubble meter, care must be taken to ensure that any introduced error will be minimal and noted. The precision rotameter may be used for calibrating the personal sampling pump in lieu of a bubble meter provided it is ... 

Figure S. A single column precision rotameter can be used a secondary calibration device.

Reflectance, Directional n Measurement of radiant flux reflected for specified directions of illumination and viewing, generally measured relative to that from a perfect difiuse reflector similarly illuminated and viewed. In practice, a reference white which approaches a perfect diffuser, or a secondary calibrated reference standard, may be used. 

Of course not all particulate matter is homogeneous in terms of its density, for example river sediments, so the method is not universal. In these cases, and also for general convenience, it is usual instead to perform a "secondary" calibration method using a narrow size ranged polymer latex sample, whose mean, mode or some other "size"has been measured by another technique. The latex method is commonly used. Suitable particles are obtained from several sources including, in europe, the Community Bureau of Reference (B.C.R.),44 and, in the U.S.A., the National Institute of Science and Technology (formerly the National Bureau of StandardsFull traceability to those Reference Materials is recommended. 

In this project the marker-based tracking has been implemented as a secondary tracking systan to be used in specific cases where the image based recognition system is not fast or reliable enough, and as a secondary calibration method. 

ASTM F649-80(1992) Standard Practice for Secondary Calibration of Airborne Particle Counter Using Comparison Procedures... 

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