By Hal Stansfield, Senior Process Engineer
Many of us who have been around the water industry for a while can recall the days of manually calibrating online analyzers. Their arsenal would include: a cart of tools, calibration standard, “calibrators”, and “zero sources”. These tools would only be used a few times a year, if that. Although the calibration of water analysis instruments should be performed on a monthly basis, most operators would admit to only calibrating them once or twice a year.