Portable Photometer for Magnesium hardness with CAL Check standards

The HI97719C magnesium hardness photometer is a portable, battery-powered meter for photometric determination of magnesium hardness from 0,00 to 2,00 mg/L (as CaCO3) with 0,01 mg/L resolution. Part of the HI97xxx series, it combines a sealed optical path, LED illumination and a narrow-band interference filter at 525 nm with a silicon photocell detector for stable, repeatable results. Accuracy at 25 °C is ±0,11 mg/L ±5 % of the reading, using an EDTA colorimetric method adapted from Standard Methods for the Examination of Water and Wastewater, 23rd Edition. Magnesium and calcium carbonates largely define water hardness; elevated hardness contributes to scale in pipes, boilers and appliances and can promote corrosion in heating, cooling, reverse-osmosis and demineralisation systems. CAL Check™ with NIST-traceable standards enables on-demand performance checks and recalibration, while the tutorial mode steps through preparation and reagent volumes. GLP last-calibration recall, storage of the last 50 readings, reaction timer, battery indicator, auto shut-off, IP67 rating and a backlit 128 × 64 LCD support reliable routine use. Delivered from manufacturer Hanna Instruments in a carrying case with two capped measuring cuvettes, plastic inserts, CAL Check™ standards, scissors, cuvette cleaning cloth, three 1,5 V AA batteries, instrument quality certificate and operating manual; required reagents are ordered separately.

This article is part of Photometers & spectrophotometers, in Spectroscopy & photometry.

Key features

• Pack size: 1 pc
• Measuring range: 0,00–2,00 mg/L (as CaCO3)
• Resolution: 0,01 mg/L
• Accuracy (25 °C): ±0,11 mg/L ±5 % of reading
• Wavelength: 525 nm (LED)
• Method: EDTA colorimetric (adapted from Standard Methods, 23rd Ed.)