Metrohm 820 IC Separation Center - Manual (Page 57)

2.9 Separating columns and suppressor module
819 IC Detector / 820 IC Separation Center
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2 Check 818 IC Pump
• Check that the aspiration capillary of 818 IC Pump is im-
mersed in the eluent.
• In the loaded system open the 818 IC Pump window and
check/set the values for the flow rate and the maximum
switch-off pressure under Settings .
• The recommended flow rate for the separating column used
can be found in the corresponding column data sheet (nor-
mally 0.5 … 2 mL/min).
• The maximum switch-off pressure should normally be approx.
3 MPa above the pressure observed with the used column,
for details see 818 Instructions for Use.
• Start 818 IC Pump with .
3 Check for leaks
• Check all capillaries and their connections between the 818
IC Pump and the detector block for escaping liquid. If eluent
escapes anywhere, the appropriate compression fitting must
be tightened further or changed..
• Check also all tubing’s and their connections between the
833 IC Liquid Handling Unit and the suppressor module (if
present) for escaping liquid and tighten or change the fittings
if necessary.
4 Check 819 IC Detector
• Open the window 819 IC Detector of the loaded system and
check/set the values of operating temperature, cell constant,
measuring range and full-scale range on the Method Parameter
tab (see sec. 3.1.2).
• Set measuring range Range so that the displayed absolute
conductivity value of the eluent lies within the selected range
(default value = 1 mS/cm).
• Set full-scale range, Full scale (default value = range/1). To
start with, it is advisable not to set too narrow a full-scale
range as the conductivity of the eluent in the conditioning
phase can change greatly until attainment of a stable tem-
perature.
5 Condition IC system
• Rinse the IC system with eluent until the desired stability of
the baseline is reached (normally 30 … 60 min).
6 Condition suppressor (if present)
• Open window 820 IC Separation Center and switch suppressor
module at least three times to the next position every 10 min.