Function
Part
Interference filter monochromator
4
Reference
5
Micro controller
6
Signal
7
Optical fibres
8
Flow cell
9
3.3
Flow cell principle
The optical path lengths of the flow cells are 1 mm, 2 mm, 5 mm and 10 mm depending
on the type of cell installed. The smaller flow cell is made of quartz with titanium housing
and the industrial cells are made of PEEK (Polyetheretherketone). The illustration below
highlights the optical path cell length (CL).
CL
The design of the flow cell above prevents the formation of distinct interfaces between
eluent components with different refractive indices and eliminates the negative influence
these would cause. The precision of monitoring is enhanced by the construction of the
flow cell, which ensures total reflectance of light. This maintains a high intensity of light
to the detector. The long path length combined with a small cell volume increases sen-
sitivity.
Monitor UVis-920 Operating Instructions 29055049 AD
23
3 System description
3.2 Monitor principle
