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14
Free Chlorine results are compared using the
HHWT-486637 (DPD-1)
with the HHWT-11 Photometer in
Menu CL1 and Hach
®
DR890 Colorimeter in Program 9 and Program 12 using Hach
®
powder pillows.
Strip DPD-1 Accuracy
Reference Standard Ampoules
Assigned Value for HHWT-486602
(lot 505)
Solution
Strip DPD-1 on Hach DR890 and HHWT-11
y = 0.9703x + 0.0561
R
2
= 0.9912
0.00
1.00
2.00
3.00
4.00
5.00
6.00
0.00
1.00
2.00
3.00
4.00
5.00
6.00
Hach DR890 (ppm)
HHWT-11
ppm (
m
g/L)
ppm (mg/L)
DR890
HHWT-11
0.00
0.00
0.41
0.39
0.92
0.96
0.79
0.73
1.28
1.32
2.70
2.73
3.20
3.22
4.45
4.75
5.30
5.53
Meter
Menu
Range (PPM)
Resolution
HHWT-11 CL1
0.00 to 5.99
0.01
6.0 to 11.0
0.1
DR890
Program 9
0.00 to 2.20
0.01
Program 12
0.0 to 11.0
0.1
Hach
®
is a registered trademark of Danaher Corporation
Parameter Desired
Value
(ppm)
Acceptable
Value
(ppm)
Free Chlorine
1.52
1.46 - 1.59
R020713
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