Metrohm 896 Professional Detector – Amperometry - Manual (Page 37)

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5 Operation and maintenance
2.896.0020 896 Professional Detector – Amperometry
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5.1.4 Shutting down
If the instrument is shut down for a longer period of time, the entire IC
system must be rinsed as follows to rid it of salts in order to prevent elu-
ent salts from forming crystals which may cause subsequent damage.
￭ Rinse all capillaries and the Dosino (if present) with methanol/ultrapure
water (1:4),
￭ rinse all pump tubings of the peristaltic pump with ultrapure water.
5.2 Amperometric detector
5.2.1 Maintenance
Warning
When rinsing the detector without column, the pressure must not
exceed 5 MPa.
In order to ensure this, set the maximum pressure of the high pressure
pump to 5 MPa in MagIC Net™.
5.2.2 Preheating capillary maintenance
The preheating capillary can become blocked, e.g. if the IC system has
inadvertently been run dry.
To dissolve this blockage, proceed as follows:
Rinsing the preheating capillary
1 Remove the separation column
Remove the separation column from the IC system and replace with
a coupling (6.2744.040).
2 Adjust settings in MagIC Net™
In MagIC Net™, adjust the following settings:
￭ Maximum pressure of the high pressure pump: 5 MPa
￭ Flow rate: < 0.1 mL/min
3 Rinse the system with the same eluent as before the blockage or
with ultrapure water.
The eluent requires sufficient time to trickle through and dissolve the
crystals.