What is the difference between membrane and optical DO probes?

Question

Accepted Answer

MANTECH supports both membrane and optical DO probes as both are approved by SM 5210B.

Maintenance - The main benefit of optical over membrane is the maintenance aspect.

 	Membrane probes are much more sensitive to storage conditions, operating practices, and the membranes need to be changed quite often.
 	Optical sensor caps last a lot longer and storage is not as critical, though our systems do still store automatically regardless of probe type.

Stability Time

 	Stability timing for each measurement is similar, can take a bit longer for optical vs membrane.
 	Stability of the measurements over an entire run or between multiple runs is better with the optical.

For these reasons, MANTECH recommends the optical probe and ~90% of MANTECH customers use optical probes. Ultimately, it is your preference and MANTECH BOD systems support either probe.