This is the bi-cell (photocell) in the 755 series paramagnetic oxygen gas analyzers. Its function is to determine the position of the test body (dumb bell) based upon the relative intensity of the light beam bouncing off of a mirror attached to the test body.
RIGAS has a replacement for this NLA (no longer available) part. Call us at 877-616-0600.
Your 755, 755G, 755A, 755R, and 755EX are NOT obsolete. As long as you don’t destroy your detector (dumb-bell assembly) we can maintain this unit for many. many years to come.
Original manufacturer: Beckman, Rosemount, Beckman Industrial