The process photometer Testomat 2000® SO3  is an online analyzer for monitoring the content of sulfite SO3 2- in the range of 0 to 50 mg/l by using the photometric analysis principle.Performance profile: Analysis via automatic dosing of two reagents The analysis result is displayed after a reaction time of approx. 3 min. (Measuring time without rinsing time)2 independently programmable limit contacts for monitoring and control tasks Menu-driven operation and programming via plain text display High-precision titration using a piston dosing pump [#dspacer#][#dspacer#][#dspacer#]Analysis initiation: Automatic interval operation (Interval pause adjustable from 0–99 min) External control Dynamic (fatigue-dependent interval operation) Quantity dependent via contact water meter Two independent limits with hysteresis (1, 2 oder 3 bad analyzes) and adjustable switching functionsMonitoring of two measuring points (Switching by external solenoid valves)Programmable service address Internal error documentation Programmable maintenance interval for maintenance request