Other main features: Up to 12 parameters No reagent (except NaOH for NH4+ and HCl for dissolved H2S) 10-years lamp lifetime Accept unfiltered waste water, even activated sludge Automatic turbidity compensation for COD, nitrate and hydrocarbons Built-in automatic cleaning system Auto-zeroing function Measuring time of 5 seconds for most parameters Can drive a 6-channels multiplexing system Compact size (520 x 390 x 220 mm) Datalogging with RS232 or USB download RS232 port for GSM modem