Why do the Pocket Colorimeter™ II Chlorine (Free and Total) and Chlorine (Free and Total plus pH) give different results?

Document ID

Document ID TE492

Published Date

Published Date 12/10/2018
Print
Question
Why do the Pocket Colorimeter™ II Chlorine (Free and Total) and Chlorine (Free and Total plus pH) give different results?
Summary
Pocket Colorimeter™ results on different models
Answer
The most common cause of different results on the Pocket Colorimeter™ II, Chlorine (Free and Total;  (Product # 5870000) versus the Pocket Colorimeter™ II, Chlorine, (Free and Total) plus pH  (Product # 5870012) is the sample cells.The glass and plastic sample cells that come with each colorimeter are not interchangeable.

The glass sample cells that come with the  Pocket Colorimeter™ II, Chlorine (Free and Total;  (Product # 5870000) can only be used in the LR (low range; 0 - 2.00 mg/L Cl 2) program on this instrument. They are not compatible with the Chlorine program on the   Pocket Colorimeter™ II, Chlorine, (Free and Total) plus pH  (Product # 5870012). 

Results on these two meters can only be compared in the high range (HR) setting, which requires the use of the plastic sample cells and a slightly different procedure. Refer to the instructions in the method for the exact steps. Results between the two instruments should be similar when the correct sample cells and when the high range procedure is performed.

 

Was this answer helpful?

Submitting...
Thank you for your feedback!
There was an error with your submission. Please try again.