Section 144.4. Routine inspection and control

(a) Preparation of control samples. Control samples shall be prepared in accordance with the methods in § 144.1 (relating to electronic methods—general).

(b) Daily performance.

(1) Accuracy check. Each day before routine testing begins, at least once each hour during the course of the testing session, and when the testing session ends, at least one subsample of control milk shall be tested using the electronic instrument. The certified tester shall read the test to 0.01%. The result difference obtained by the reference method must be 0.05 or less than the known reference test sample result. If the difference of the samples exceeds 0.05, the certified tester shall discontinue operation of the instrument, determine the reason for the difference and correct the deficiencies before resuming operation.

(2) Repeatability check. Each day before routine testing begins, and generally within the first hour of the session, at least ten consecutive readings on a single well-mixed sample of milk that has not been homogenized shall be made and recorded as a permanent record. If more than ten consecutive readings are taken, the certified tester shall use the last ten results. The repeatability check is acceptable if the range of the ten readings is 0.04 or less.

The provisions of this § 144.4 amended January 11, 2013, effective January 12, 2013, 43 Pa.B. 216. Immediately preceding text appears at serial pages (237846) to (237847).

Notation

Authority

The provisions of this § 144.4 amended under section 307 of the Milk Marketing Law (31 P. S. § 700j-307).

Cross References

This section cited in 7 Pa. Code § 144.1 (relating to electronic methods—general); 7 Pa. Code § 144.1a (relating to definitions); and 7 Pa. Code § 144.3 (relating to laboratory facilities and supplies).