Purafil’s OnGuard® Environmental Reactivity Monitor (ERM) offers the only reactivity monitor capable of measuring real-time corrosion severity levels that correlate to air quality classifications. The OnGuard ERM uses highly-sensitive, quartz crystal microbalance sensors to continuously measure in real-time the total environmental corrosion due to the presence of harmful gaseous pollutants. The OnGuard ERM continuously detects and records changes in gas concentrations at levels <1 ppb, allow for preventive action and immediate detection of air quality events.

Why use the OnGuard® ERM? The OnGuard provides continuous monitoring data necessary to establish air quality trends. Unlike other air monitoring methods, OnGuard takes into account the synergistic effects of multiple contaminants present and results can be related directly to acceptance criteria for air quality classifications of preservation environments.