volume Replacement of Fluoride Replace calculations. controller if suspect. concentration controller. more than Ensure that all Install 1 mg/L. metering and dosing equipment with equipment is fail-safe Frequent required and shuts off repair needed. safeguards. automatically on fault. Maintenance Instigate weight/ Perform log not signed volume cross each day of amount of off. checks. fluoride dosed against No automatic the volume of water shut off in produced. of fault. Install an alarm to No evidence of indicate when the dose cross fluoride concentration checks having exceeds to the target been carried level. out. Regular manual Manual sampling checks on fluoride and analysis. concentration in treated water, with these samples being periodically split and sent for independent analysis. P9.1.4 Periodic checks on Fluoride Fluoride Adjust controller fluoride concentration concentration set point. Dose rate set an independent more than incorrectly. method of fluoride 1 mg/L. Calibration measurement. schedule. Monitoring checks show deviations from expected fluoride concentration. Event: FLUORIDE CONCENTRATION GREATER THAN REQUIRED FOR DENTAL PROTECTION cont’d P9.1.5 Regular checks on Recalibrate Fluoride fluoride sensor fluoride sensor. Controller’s calibration using fluoride Determine independent sensor out of reason Calibration for poor calibration solutions. calibration or calibration schedule. and malfunctioning rectify.
volume calculations. Fluoride concentration more than 1 mg/L. Frequent repair needed. Maintenance log not signed off. No automatic shut off in of fault. No evidence of dose cross checks having been carried out. Replacement of controller if suspect. Ensure that all metering and dosing equipment is fail-safe and shuts off automatically on fault. Perform each day of amount of fluoride dosed against the volume of water produced. Install an alarm to indicate when the fluoride concentration exceeds to the target level. Replace controller. Install equipment with required safeguards. Instigate weight/ volume cross checks. Regular manual checks on fluoride concentration in treated water, with these samples being periodically split and sent for independent analysis. Manual sampling and analysis. P9.1.4 Dose rate set incorrectly. Periodic checks on fluoride concentration an independent method of fluoride measurement. Fluoride Calibration schedule. Fluoride concentration more than 1 mg/L. Monitoring checks show deviations from expected fluoride concentration. Adjust controller set point. Event: FLUORIDE CONCENTRATION GREATER THAN REQUIRED FOR DENTAL PROTECTION cont’d P9.1.5 Controller’s fluoride sensor out of calibration or malfunctioning Regular checks on fluoride sensor calibration using independent calibration solutions. Fluoride Calibration schedule. Recalibrate fluoride sensor. Determine reason for poor calibration and rectify.
treatment-fluoridation-feb14-v2.docx