Process : IR optical absorption (950nm), pulsed emission
(frequency 10 Hz) and regulated

Measurement Range : two possibilities :
- VB20-S1O : optical distance : 20 mm (up to 2 g/l) .
- VB5-S1O : optical distance : 5 mm (up to 20 g/l)

Displayed parameter: % of transmitted light
- 100% : pure water
- 0%: opaque sludge