La. Admin. Code tit. 51 § XII-1107

Current through Register Vol. 50, No. 9, September 20, 2024

Section XII-1107 - Calibrationt/Validation of Turbidimeters

A. General. Calibration_t using a turbidity primary standard shall be done in accord with approved methods listed in §1105 B

B. Calibration_t of Turbidimeters. Bench top and continuous monitoring turbidimeters shall be calibrated using a turbidity primary standard at a frequency of no less than once every 90 days. The instruments shall be calibrated in accord with the manufacturer's instructions.

C. Validation of Bench Top Turbidimeters. Calibration_t of the bench top turbidimeters shall be validated with state-approved secondary standards each time a sample or set of samples is tested. For turbidity measurements less than 0.2 NTU and the turbidimeter reading is +-20 percent or more deviation of the state-approved secondary standard, the bench top turbidimeter shall be recalibrated with a turbidity primary standard. For turbidity measurements greater than or equal to 0.2 NTU and the turbidimeter reading is +-10 percent or more deviation of the state-approved secondary standard, the bench top turbidimeter shall be recalibrated with a turbidity primary standard.

D. Validation of Continuous Monitoring Turbidimeters. Calibration_t of the continuous monitoring turbidimeters shall be validated at least once each week by either using a state-approved secondary standard or determining the turbidity of the water flowing out of the continuous monitoring turbidimeter using a bench top turbidimeter. Follow-up actions based upon the validation method selected are as follows.

1. Validation by Use of a State-Approved Secondary Standard

a. If the state-approved secondary standard is less than 0.2 NTU and the continuous monitoring turbidimeter reading is +-20 percent or more deviation of the state-approved secondary standard, the continuous monitoring turbidimeter shall be recalibrated with a turbidity primary standard. If the state-approved secondary standard is greater than or equal to 0.2 NTU and the continuous monitoring turbidimeter reading is +-10 percent or more deviation of the state-approved secondary standard, the continuous monitoring turbidimeter shall be recalibrated with a turbidity primary standard.

2. Validation by Determining the Turbidity of the Water Flowing out of the Continuous Monitoring Turbidimeter Using a Bench Top Turbidimeter

a. For turbidity measurements less than 0.2 NTU and the continuous monitoring turbidimeter reading is +-20 percent or more deviation from the bench top turbidimeter reading, the continuous monitoring turbidimeter shall be recalibrated with a turbidity primary standard. For turbidity measurements greater than or equal to 0.2 NTU and the continuous monitoring turbidimeter reading is +-10 percent or more deviation from the bench top turbidimeter reading, the continuous monitoring turbidimeter shall be recalibrated with a turbidity primary standard.

E. Re-Standardization of Secondary Standards. Each time a turbidimeter has been calibrated with a turbidity primary standard, the secondary standards shall be re-standardized. When a secondary standard has been assigned an expiration date by the manufacturer, nothing herein shall be construed as to allow the re-standardization of such secondary standard beyond the expiration date set by the manufacturer.

F. Records of Calibrations/Validations. Records of calibrations/validations on each bench top and continuous monitoring turbidimeter shall be maintained for at least three years, as follows.

1. Records of bench top turbidimeters shall include meter location, meter identification, dates of calibration_t, and the name of the person performing the calibration_t.

2. Records of continuous monitoring turbidimeters shall include meter location (e.g., filter number), unique meter identification (e.g., model and serial number), dates of calibration_t, dates of validation, and the name of the person performing the calibration_t.

G. Records of Re-Standardization of Secondary Standards. Records of any re-standardization of secondary standards shall be maintained for at least three years, as follows.

1. Records of re-standardizations done using bench top turbidimeters shall include the value assigned to the secondary standard, date of assignment, meter identification (e.g., model and serial number) which was used to assign the secondary standard its unique value for such meter, manufacturer's expiration date, and the name of the person performing the re-standardization.

2. Records of re-standardizations done using continuous monitoring turbidimeters shall include the value assigned to the secondary standard, date of assignment, meter location (e.g., filter number), meter identification (e.g., model and serial number) which was used to assign the secondary standard its unique value for such meter, manufacturer's expiration date, and the name of the person performing the re-standardization.

La. Admin. Code tit. 51, § XII-1107

Promulgated by the Department of Health and Hospitals, Office of Public Health, LR 28:1337 (June 2002), amended LR 28:2517 (December 2002).

AUTHORITY NOTE: Promulgated in accordance with R.S. 40:4(A)(8) and 40:5 (5)(6)(17)(20).