Metrohm 828 IC Dual Suppressor User Manual

Page 33

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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%.

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