AZURA® Detector RID 2.1L / RID 2.1L HighFlow Instructions V6750
Product information 5
different refractive index, the light beam is geometrically proportionally
deflected depending on the relative change of the refractive index
(according to Snell´s law).
This results in a change of the light intensities I
1
and I
2
(one increases and
the other decreases), proportional to concentration and refractive index
of the sample solution. From these intensity changes the signal value is
calculated.
1.5.2 Calculating the signal value
Signal value
I
1
–I
2
= difference of intensity values
I
1
+I
2
= sum of intensity values
a
= autozero constant
c
= calibration constant
The light beam reaches the two detector diodes (1 and 2) which deliver
the intensity values
I
1
and
I
2
during measurement, depending on the light
beam’s deflection. The difference and sum of
I
1
and
I
2
are calculated con-
tinuously, and the resulting signal is given out to the device’s outputs.
1.5.3 Flow path
During analysis, the solvent takes the following flow path (see figure
below):
1.
Enters through IN port.
2.
Passes through heat exchanger.
3.
Flows through sample compartment of the flow cell.
4.
Passes through flush valve.
5.
Exits through OUT port.
1
2
3
4
Analysis
