Metrohm 828 IC Dual Suppressor - Manual (Page 33)

3.5 Flow rate ratio
828 IC Dual Suppressor/ 8.828.1003 Instructions for Use
25
3 Calculation
Use the following equation to calculate the fraction of the flow to
the detector compared with the total flow rate of 1 mL/min:
Detector flow fraction (in %) = (V/3 mL) x 100
or = (m/3 g) x 100
If you check the detector flow for other total flow rates than 1
mL/min then change the denominator in the formulae accord-
ingly.
4 Adjustment
If the detector flow fraction is not within the limits of
40% ± 5% then the ratio between the flow rates must be adjusted.
This is done by adjusting the setting screw "Detector Flow" 11
with a screwdriver.
• A clockwise rotation increases the detector flow rate fraction of
the total flow rate.
• A counterclockwise rotation decreases the detector flow rate
fraction of the total flow rate.
Proceed according to items 2 and 3 to check again whether the
ratio between the flow rates is now correctly adjusted.
If it is impossible to set the correct ratio this indicates a blockage
in the flow path, see Section 4 Troubleshooting - Problems.
The ratio between the flow rates can also be checked at the "Waste" 12
outlet of the 828 IC Dual Suppressor, where the eluates from the anode
and cathode outlets of the suppressor cell escape. These flows should
have a fraction of the total flow rate of 60% ± 5%.