Hach AutoCAT 9000 - Total Chlorine, Amperometric Back Titration

Free Chlorine
Free Chlorine
50081_Chlorine_Free_Forward.fm Page 97
Method Performance
21. Press 1 to select
New Test to perform a
replicate sample.
Press
2 to select New Sample
to analyze a new sample with
a new ID.
Press
3 to select
End Analysis to return to the
Methods menu.
Table 1 Recommended Volume Increment Settings for Free Chlorine
Estimated Chlorine Conc. (mg/L) Suggested Volume Increment (mL)
0.10–0.30 0.0010
0.30–0.50 0.0100
0.50–1.00 0.0300
1.00–1.50 0.0600
1.50–2.00 0.0900
> 2.000 0.1500
Note: These recommendations apply to Free Chlorine titrations, correspond to data collection
times typically under 5 minutes, and provide adequate data points on both sides of the titration
end point for proper analysis. Adjusting the volume increment will reduce the data collection
times and number of data points collected. For example, doubling the volume increment will cut
the data collection time and the number of points collected in half.
Table 2 Precision Statements
At Concentration 95% Confidence Limits
0.277 mg/L Cl
2
0.251–0.303 mg/L Cl
2
1.924 mg/L Cl
2
1.778–2.070 mg/L Cl
2
4.942 mg/L Cl
2
4.650–5.234 mg/L Cl
2