What is considered “normal” sensor weight loss? [Applicable to LD, RM, and PLC Series continuous monitoring systems, and portable sensors for formaldehyde and hydrazine]

10-20 grams/month. A weight loss of more than 50 grams makes sensor restoration difficult, and beyond 100 grams, it is virtually impossible. Weight loss is affected by ambient humidity, flow rate, and in certain cases, the type of sensor being used. The sensors work best, and last longer, if they are kept moist. If your…

Can you explain the mysterious “2:00 AM false alarms” occurring on my ethylene oxide monitoring system?

Your EtO monitoring system is very sensitive, and must respond to sub parts-per-million (ppm) concentrations of this gas. It may be that maintenance crews are using floor wax, strippers, assorted cleaning products, or isopropyl alcohol, and these compounds can cause a response on the system, especially since they would be present at concentrations in excess…