About The Accuracy/Calibration Of The Exact ® Micro 20 System - eXact Micro 20 Instruction Manual

About the Accuracy/Calibration of the eXact Micro 20 System
All tests have been calibrated using certified reference standards and standard analytical
spectrophotometric methods. The algorithms in the software reflect the best correlation of the eXact
Micro 20 Systems against the AWWA, US EPA , DIN, and ISO reference test methods for chlorine.
Studies show that the eXact
method greater than 99% (R2= 0.99948, 0 – 5.00 ppm – see below). The eXact
Photometric System has been factory calibrated for your convenience. You can expect the fixed
calibrations in the meter to be valid for the life of the meter because of the quality, Long–Life LED,
the photo cell, and the software as written into the meter. This is why the meter comes with a 2–Year
Warranty.
Ready Snap™ Lot
Red Dye #505
Blue Dye #506
NOTE: Values reflect current concentrations as found at time of manufacture and may change with consecutive lots.
eXact Strip Micro DPD–1 Accuracy
®
Free Chlorine results are compared using the eXact
20 Meter in MENU CL and Hach
powder pillows.
28
Micro 20 System repeatedly agrees with an EPA Compliant reference
®
Assigned Value for Ready Snap™ Solution
Desired
Value (%T)
17.1
22.0
DR890 Colorimeter in Program 9 and Program 12 using Hach
®
Acceptable
Value (%T)
16.5 – 17.5
21.0 – 23.0
Strip Micro CL (DPD–1) with the eXact
®
DPD Free Chlorine stud
5.0
4.5 y = 0.9814x
R = 0.99948
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
0.0 0.5 1.0 1.5
Hach Free Chlorine, ppm
Micro 20 Advanced
®
Select
Menu
Group
7
7
, March 20, 2012
Hach vs ITS
Linear (Hach vs ITS)
2.0 2.5 3.0 3.5
®
TR1
TR2
R040615-BT
Micro
®
®
4.0 4.5 5.0