Photometric (waste) water chemical oxygen demand tester - comprising measuring tube contg. dry thermostat electronically coupled to filter photometer with digital display

摘要: Tester consists of a dry thermostat and filter photometer for 2 wave -lengths with digital display. The are coupled electronically form an integral unit. pref. Al block 8 or 16 measuring tubes mechanical time switch, switched off electrically after running up to hrs.. apparatus requires little space is easily handled by unskilled staff. Accurate test results obtd. Contact etching and/or toxic reagents prevented using reaction provided screw caps.