§ 144.5. Instrument calibration.
(a) Calculation of calibration results. An instrument shall be considered to be calibrated properly when the average difference between the instrument results for butterfat and protein and the reference method results for at least ten different control samples, called mean average, is +/-0.04 and the standard deviation of the difference between the instrument and reference methods, called standard deviation, is 0.04 or less. For all solids the mean average is +/-0.09 and the standard deviation of the differences between the instrument and reference methods is 0.12 or less for those same ten samples.
(b) Conditions requiring calibration.
(1) The instrument shall be calibrated when initially installed.
(2) The instrument shall be calibrated when the accuracy check is confirmed to have failed.
(3) The instrument shall be calibrated if a part which may affect proper operation of the instrument is replaced, rebuilt or adjusted.
(4) The instrument shall be calibrated upon the occurrence of the specific circumstances which require calibration for that instrument, as determined by the manufacturer.
(5) The instrument shall be calibrated when new controls are available.
Authority The provisions of this § 144.5 amended under section 307 of the Milk Marketing Law (31 P. S. § 700-307).
Source The provisions of this § 144.5 amended January 11, 2013, effective January 12, 2013, 43 Pa.B. 216. Immediately preceding text appears at serial pages (237847) to (237851).
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