AWWA Articles

AWWA Comment Period on ANSI/AWWA C670-XX – Online Chlorine Analyzer Operation and Maintenance

June 12, 2020

AWWA solicits public comments on all proposed new AWWA Standards, and on all proposed revisions, reaffirmations, or withdrawals of existing AWWA Standards. The referenced standards project is being considered for approval and the publication of this notice begins the 45-day public comment period for AWWA and ANSI. An electronic public review copy of the proposed standard can be obtained for review during the comment period by emailing Comments must be submitted in writing to the AWWA contact listed below no later than the last day of the comment period specified herein. Such comments shall be specific to the section(s) of the standard under review and include sufficient detail so as to enable the reader to understand the commenter's position, concerns and suggested alternative language, if appropriate.

AWWA Comment Period closes on July 27, 2020.

Send comments to:
Liz Ralph
303.347.6177 phone
303.795.7603 fax

The review copy will be edited for publication and may also be revised as appropriate based on any comments received during the public comment period. Therefore, this copy is not suitable for continued utilization and is intended only for comment purposes.

Final publication of the standard may take several months. When it is available, a notice will be published in the official notice section of Journal - American Water Works Association. The standard becomes an effective AWWA standard on the first day of the month following such publication in Journal - American Water Works Association. 

This standard describes online chlorine analyzer operation and maintenance (O&M) when the online chlorine analyzer is used for monitoring in the treatment of potable water, reclaimed water, or wastewater.

Major changes made to the standard in this revision include the following:
1. A sentence was added to Sec. 1.2 Purpose addressing monochloramine formation and free ammonia.
2. In Sec. 2 definitions for amperometric method and resolution were added, the definitions for LOD and LOQ were expanded on, and revisions were made to the definitions for chlorine free residual, disinfection-by-products, electrolyte and photometric method.
3. The sections on ion-specific selective chlorine analyzers (Sec. 4.1, and previous Secs. 4.1.3 and 4.2.3) were deleted because no ion-specific or selective technology for chlorine determination exists.
4. Sec. 4.1.1 Amperometric chlorine analyzers was updated to include a sentence on sample flow rate.
5. Sec. 4.3.1 Storage was updated to address expiration of reagents.
6. Sec. 4.3.2 Contamination was expanded to include information on discoloration of reagents.
7. A new Sec. 4.3.3 was added on disposal of reagents.
8. Sec. 4.4.1 Continuous sample streams was updated to include a caution about the use of strainers.
9. Sec. 4.4.4 Sample delivery tubing was updated to provide additional details on sample tubing.
10. Sec. 4.6.1 Representative sample was revised to include information on sample quills and sample taps.
11. Sec. 4.6.2 Location of sampling port was expanded on.
12. Sec. 4.6.3 Flow requirements was revised and information on use of a sampling pump was added.
13. Sec. 4.6.4 Analyzer waste stream was slightly revised.
14. Sec. 4.6.7 Sample locations was expanded on with additional information on grab samples.
15. The first paragraph of Sec. 4.8 Calibration and Verification Techniques was revised for clarity.
16. Sec. 4.8.4 Calibration verification by comparison was revised.
17. Sec. 5.1 Instrument Verification was updated.
18. A sentence on CMMS was added to Sec. 5.2.2 Records retention, and the period of time to retain records was removed to comply with AWWA policy.
19. Four new references were added to Appendix A.