Metrohm 732 IC Detector - Manual (Page 47)

2 Installation
732 IC Detector / 733 IC Separation Center
40
2.8.7 Leak testing and conditioning
Before sample solutions can be injected in the IC system, the entire
system must be tested for leaks and then conditioned with eluent until
the baseline is stable. Proceed as follows:
1 Switch on 709 IC Pump
• Immerse aspirating capillary of the 709 IC Pump in eluent.
• Set flow rate recommended on the 709 IC Pump for the
separating column used (normally 0.5 … 2 mL/min).
• Set maximum shutoff pressure on the 709 IC Pump
(normally ca. 3 MPa above the pressure observed with the
column used).
• Switch on 709 IC Pump.
2 Check for leaks
• Check all capillaries and their connections between the 709
IC Pump and the detector block for escaping liquid. If eluent
escapes anywhere, the appropriate compression fitting must
be tightened further or changed.
3 Switch on 732 IC Detector
• Switch on 732 IC Detector with mains switch 99.
• Set operating temperature: Under the key,
enter the desired value for the parameter "
thermostat
"
(default value = 35 °C).
• Enter cell constant: Under the key, enter the
value printed on the detector block for the parameter "
cell
constant ".
• Set measuring range: Under the key, set the
parameter " 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: Under the or
SCALE> key, enter the desired value for the parameter " 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 temperature.
4 Condition IC system
• Rinse the IC system with eluent until the desired stability of
the baseline is reached (normally 30 … 60 min; if the eluent is
changed, the establishment of the ion exchanger equilibrium
on the separating column can take longer).
5 Condition suppressor (if present)
• Load method " Prep-MSM " and start this method. The suppres-
sor module is switched to the next position every 20 min and
in this way conditioned.