An important consideration for successful implementation of spectroscopic analyzers is the ability to continually validate the performance of the analyzer system’s hardware components. The ASTM D6122 standard addresses this concern by out lining testing requirements. The Stability Monitoring System (SMS) is a hardware/software package that continuously monitors the accuracy and precision of the analyzer thus ensuring the NIR-O analyzer is producing validated spectra for your applications. The SMS exceeds the requirements of ASTM D6122 for analyzer validation without the need for consumables or human interaction.
The NIR-O process analyzerand LAB NIR-O laboratory analyzer are at the core of a comprehensive system that includes the spectrometer, one or more NIR probes, fiber optic cables, and scanning and analysis software.OmniViewis the software controlling all aspects of a NIR-O analyzer andOmniLab controls LAB NIR-O.This software provides full control of the analyzer operations, diagnostics, data manipulation, maintenance and event logging, trend graphs and alarms, calibration model security, and control of inputs and outputs.
If the SMS option is selected for NIR-O then one channel must be dedicated to it use.
The performance tests identified in the ASTM practice are diagnostics that can be used to detect changes in analyzer performance. This validation provides assurance that the measurement produced by the analyzer is a result of equipment that is operating properly. Since this is a hands-off procedure, it can be conducted in the background with no human intervention. The validation is done with an internal filter having a characteristic spectral signature. There are no liquids or other external sampling modes that are necessary.
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A flow chart depicting a typical SMS level 0 validation flow diagram is shown in Figure 1. Guided Wave’s SMS operation is seamlessly integrated into the OmniView control software or OmniLab for LAB NIR-O. SMS provides assurance that all of the ASTM required measurements are conducted at the appropriate time and will send a signal or message to the control system if a validation issue is encountered
This topic is addressed in ASTM practice D-6122-191 under instrument performance tests. The ASTM practice provides a set of criteria for establishing baseline analyzer performance validation. Three levels of hardware testing are established:
This is a pass/fail performance test that is sensitive to all of the Level 0 parameters. Level A tests do not identify specific failure modes, but do indicate if the instrument performance is within historical bounds. In this test, the spectrum of a check sample (or an optical filter) is compared to a historical spectrum of the heck sample.
The level B tests analyze the spectrum of the SMS filter against the models in use on the analyzer system. This monitors for deviations to which the calibration model is sensitive. The results are compared to historical values to detect any change in the analyzer performance. Note: The level B tests are not automatically part of the SMS because they require the customer’s unique calibration models, which Guided Wave may not have. Guided Wave can assist customers in implementing Level B tests as part of\ their SMS installation.
1 ASTM D6122-19 Standard Practice for Validation of the Performance of Multivariate Online, At-Line, and Laboratory Infrared Spectrophotometer Based Analyzer Systems, ASTM International, West Conshohocken, PA, 2019 www.astm.org