OptiMelt Automated Melting Point System - Stanford Research ...

Chapter 4 Maintenance and Calibration 69Step 9Repeat Steps 2 thru 8 for the two remaining (Middle and High) CRSs.Step 10 – Calculation of Temperature Offset CorrectionsCollect the averaged clear points (Measured MPs from Step 7) obtained for the threeCRSs and calculate the temperature offset correction (TOC) for each CRS according towhere,TOC = MP Rated − MP MeasuredTOC is the temperature offset correction,MP Rated is the melting point temperature assigned to the CRS sample by the certificationlaboratory (if a melting point range is specified, use the mean of the range),MP Measured is the melting point temperature from Step 7 as actually measured by theOptiMelt unit during this Acceptability Test.If the magnitude of any of the three calculated TOCs exceeds the publishedaccuracy specifications of your OptiMelt (Table 4 below), the temperaturecalibration must be updated as described in Step 11.Melting Point (°C)Accuracy (°C)250 ± 0.8Table 4. OptiMelt Temperature Accuracy.TipsRated MPs are listed in the Certificates of Measurement included in all CRS kits.Assigned MPs (clear points) are listed on the labels of the CRSs packaged in theO100MPS CRS Kit.The Rated MP of a CRS is usually the clear point of the substance rated by theCertifications Lab. If a temperature interval (MP Range) is indicated instead of a clearpoint, use its mean as the Rated MP and also use means to calculate the Measured MP tobe consistent.OptiMelt Automated Melting Point System