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Chemical digestion of samples is required for the photometric determination of COD, TOC, total phosphate and total nitrogen. The required temperatures and reaction time can be selected by using the membrane keypad of the reactor AL125. The unit works at three different temperatures ( 100 / 120 / 150 ° C) and three pre-set reaction times 30 / 60 / 120 minutes) . When digestion is complete, the reactor automatically switches off and gives a corresponding LED indication with short beep alarm. The AL125 reactor is fitted with 24 holes for 16 mm diameter vials. For the digestion of: COD ( 150° C) Total Chromium ( 100° C) Total Phosphate ( 100° C) Total Nitrogen ( 100° C) TOC ( 120° C) Technical data AL125 Power supply 230 V / 50-60 Hz or 115 V / 50-60 Hz ( switchable) Power 550 W Dimensions 248 x 219 x 171 mm Weight 3.9 kg Materials, housing ABS Protection grid PPS Lid PC Block insert PBT Heating block Aluminium Holes in the 24 holes, aluminium block 16.2 mm ± 0.2 mm Selectable temp. 100 / 120 / 150 ° C Probe type Pt100 A class Temperature stability ± 1 ° C at the Pt100 Selected time 30 / 60 / 120 / min. and continuous operation ( ) Heating up from 20° C to 150° C in 12 min. Regulation Microprocessor Protection against at the alu block overheating at 190 ° C Beeper max. 88 dB ( Piezo Summer) Environmental conditions 10 – 40 ° C max. 85 % rel. humidity CE-conformity