Light is generated by a xenon lamp in the emitter and reflected back to the receiver via mirrors.
From the receiver, it is passed to the analyzer through a fibre optic cable. The ER 080 has particular applications in large diameter stacks and where there may be advantages in only mounting a single unit on one side. For stack diameters below five metres the ER 070 unit may be used. The ER 080 also includes a separate, parallel lightpath for automatic calibration, using a reference cell in a sealed tube. Automatic calibration requires the calibration unit CU 007.