Specifications

INTRODUCTION
1.3.4 SO2
The optical bench can selectively measure multiple components in a compact design by using a
unique dual optical bench design. Depending on the application, any two combinations of NDIR
channels can be combined on a single chopper motor/dual source assembly.
Other application-dependent options include a wide range of sample cell materials, optical filters
and solid state detectors. The NDIR Microflow detector consists of two chambers, measurement
and reference with an interconnected path in which an ultra low flow filament sensor is mounted
during operation, a pulsating flow occurs between the two chambers which is dependent upon:
sample gas absorption, modulation by the chopper motor and the fill gas of the detector
chambers. The gas flow/sensor output is proportional to the measured gas concentration. The
optical bench is further enhanced by a novel “Look-through” detector technique. This design
allows two detectors to be arranged in series --- enabling two different components to be
measured on a single optical bench. The optical bench contains a unique eddy current drive
chopper motor and source assembly. This design incorporates on board “intelligence” to provide
continuous “self test” diagnostics.
Rosemount Analytical µCEM Continuous Analyzer Transmitter 1–7