La. Admin. Code tit. 51 § XII-1109

Current through Register Vol. 50, No. 11, November 20, 2024

Section XII-1109 - Calibrationdra/Validation of Disinfectant Residual Analyzers

A. Validation of Bench Top Disinfectant Residual Spectrophotometers/Colorimeters. The accuracy of bench top spectrophotometers/colorimeters used for disinfectant residual monitoring, particularly for validation of continuous disinfectant residual monitors, shall be determined at a frequency of no less than once every 90 days by use of a NIST traceable standard solution which has been obtained from an approved source (e.g., certificate of analysis by manufacturer). Deviations of +-10 percent or more shall be cause for calibration_dra of the equipment. The instruments shall be calibrated in accord with the manufacturer's instructions. After calibration_dra the instrument's accuracy shall be validated prior to return to service.

B. Validation/Standardization Using Other Methods. For approved methods for disinfectant residual analysis other than spectrophotometric/colorimetric methods, validation/standardization of disinfectant residual analyzers shall be performed in accord with procedures outlined in the particular method [see §1105 C].

C. Validation of Continuous Disinfectant Residual Monitors. The accuracy of residual disinfectant measurements from any continuous disinfectant residual monitor shall be validated weekly. Validation shall be performed by collecting a grab sample from the tubing supplying water to the monitor (e.g., via a tee connection which is normally capped or valved closed) at a location immediately upstream (less than 5 feet) of the continuous disinfectant residual monitor. Such grab sample shall be analyzed using a bench top spectrophotometer/colorimeter which has been calibrated according to §1109. A of this Chapter. If the spectrophotometer/colorimeter reading indicates +-10 percent or more deviation as compared to the continuous disinfectant residual monitor reading, the cause of the disparity shall be investigated and resolved within five working days. In the meantime, grab samples shall be collected and analyzed every two hours as per §1125. B of this Chapter. The accuracy of residual disinfectant measurements from any replacement instrument shall be validated prior to service or return to service.

D. Records of Calibrations/Validations. Records of calibrations/validations on each bench top spectrophotometer/colorimeter used for disinfectant residual monitoring and on each continuous disinfectant residual monitor shall be maintained for at least three years, as follows.

1. Records of bench top spectrophotometers/colorimeters shall include meter location, meter identification, dates and results of NIST traceable standard solution, dates of calibration_dra/validation and the name of the person performing the calibration_dra/validation.

2. Records of continuous disinfectant residual monitors shall include meter location, unique meter identification (e.g., model and serial number), dates and results of calibration/validation, and the corrective actions taken when deviations of +-10 percent or more occur.

La. Admin. Code tit. 51, § XII-1109

Promulgated by the Department of Health and Hospitals, Office of Public Health, LR 28:1338 (June 2002), amended LR 28:2518 (December 2002).

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