# K193169: Nelson Sentinel Series Basic Chlorine Sentinel

- Pathway: 510(k) (Traditional)
- Applicant: Nelson Environmental Technologies, Inc.
- Decided: Oct 29, 2020 after 349 days
- Product code: MSY (Strip, Test, Reagent, Residuals For Dialysate, Disinfectant)
- Device class: 2
- Regulation: 21 CFR 876.5665
- Recalls of this device: none
- Data: FDA decisions to Oct 25, 2026; recalls to Oct 12, 2026

## Lineage
Longest line of descent: 1 generation back to K090338 (2009). 1 ancestor in all.
1 later device descends from it; 1 cites it directly.
0 of 3 devices in its family (counting itself) have a Class I recall.

## Predicates on the family tree (from the FDA summary)
- K090338: Ultra Low Total Chlorine, E-Z Chek Sensitive Total Chlorine, Reprocessing Products Corp (2009) Summary page 4.

## Most influential descendants
- K243898: Chlorine Sentinel II (2025), 0 descendants of its own

## Indications for use
The Nelson Sentinel Series Basic Chlorine Sentinel is an instrument that is intended for use by hemodialysis professionals as an auxiliary device to provide continuous monitoring of Total Chlorine. (i.e. total chloramines plus ammoniated free chlorine) concentration. It is not intended to replace the primary method for monitoring total chlorine as part of the hemodialysis water treatment system. It functions completely independent of the water treatment system and does not come into direct contact with feed water used to prepare dialysate.

Source page: https://510kreport.com/device/K193169
Methodology: https://510kreport.com/methodology