How do zero calibrations differ between the TU5 series and legacy instruments like the 1720E and UltraTurb?
TU5/ 1720/ UltraTurb - zero NTU calibration validation.
1. 1720E and TU5 instruments work with two different technical standards, therefore the turbidity values are not 100% comparable, especially around zero:
- 1720E white light (EPA Method 180.1)
- TU5 EPA red laser (EPA Method 10258)
- TU5 ISO IR Laser (ISO Methode 7027)