ETI analyzers are calibrated after installation using samples made from the materials used in the existing process. Laboratory analysis is performed on the samples and a comparison is done with the analyzer results. Analyzer results are then adjusted to match the laboratory analysis.
No two detectors are exactly alike. If a detector is replaced, the replacement will have slightly different physical characteristics, and the calibration must be checked by running the samples used at installation. A calibration adjustment will be performed if needed.
The analyzer's calibration covers a wide range of materials, but it is possible to introduce a material with enough differences to warrant recalibration. If a recalibration is needed, it will be performed using samples made from the new material.