5500 sc Silica Analyser Lower Maintenance, Less Downtime. The 5500 sc Silica Analyser requires only two liters of reagent for the analyser to perform unattended for up to 90 days; twice as long as the Series 5000. The industry’s only pressurised reagent delivery system eliminates the frequent maintenance associated with pumps. Predictive diagnostic tools, including Hach’s proprietary Prognosys technology, warning LEDs, and high-visibility notification screens let you avoid unplanned downtime. No more dripping reagents on the instrument, the floor, or your clothing while fumbling with tubes and straws. Simply match the colour-coded cap to the sealed reagent bottle and twist gently. Grab Sample In and Grab Sample Out features allow quick analysis of a grab sample poured into the analyser, and facilitate taking a sample out of the analyser to verify in a lab test.