Is it EPA approved? What are the annual maintenance costs? New probe? sensor cap? Does it require moving water, ie stir bar?

The EPA does not approve technology or equipment any longer, they approve methods and require that any technology follows the chemistry of that method. This DO meter/probe is one of the optical varieties. There are approved methods for DO/BOD that do have the optical probes as the required equipment. You can use this probe/meter with any of the approved optical DO methods. The maintenance on this probe consists of replacing the sensor cap every 365 days. There is a countdown timer in the microchip on the cap that starts from the first day of use. The replacement cap part number is EE3564051. This probe does not require a stirrer of any sort to obtain an accurate reading. Stirring the sample will speed up the reading time by a small amount.

Do you have a question?

Email me the answer?