What is the difference between the B-2 and B-2C sensor?
A class B-2C cell is just a B-2 with a clamp over the sensing membrane. The specifications are exactly the same. Now that Teledyne has clamped all the trace O2 sensors, a letter C was added to those cells, and we no longer make a class B-2 or A-2 cell. The class B-2C cell is the correct replacement sensor for any application that normally requires a B-2 or a B-2C cell. In the past this clamp was reserved for applications where the sample gas was lighter than air (like H2 and HE). Due to the mobility of these gases, it was more likely that the membrane would lift and cause a leak at the seams. To prevent that from happening, we added a clamp to strengthen the seal. We have since decided to add this clamp to all B-2 cells, and make them all class B-2C. Now this one sensors covers all the trace O2 applications, (except for a CO2 containing sample, which has its own cell class, A-2C).
