Why do I have low NTU readings or a very high gain on my 1720 series turbidimeters when I install a new lamp and have passed the photocell mV tests?

Document ID

Document ID TE7008

Published Date

Published Date 05/27/2017
Print
Question
Why do I have low NTU readings or a very high gain on my 1720 series turbidimeters when I install a new lamp and have passed the photocell mV tests?
Summary
1720 series turbidimeter high gain, low NTU troubleshooting.
Answer
If you have already replaced your lamp and your photocell passes the mV test, on a 1720 series turbidimeter, a commonly missed item is the focusing lens in the turbidimeter. This lens helps to focus the light from the lamp down to the light bulb. If this lens is very dirty or becomes damaged, the NTU can be very low and the gain during calibration will be very high.

Was this answer helpful?

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