Metrohm 761 SD Compact IC - Manual (Page 107)

6.2 Maintenance and servicing
761 SD Compact IC / Instructions for Use 8. 761.1043
99
Regeneration of the suppressor in the case of high
counter-pressure
If excessive counter-pressure is observed in one or several suppressor
units, treat the units as follows:
1 Disconnect the suppressor from the IC system
• Disconnect the suppressor from the separating column and
detector.
2 Regenerate the suppressor
• Connect the inlet capillary 45 marked "H2SO4" to the “inlet
capillary to injector” 31 using the PEEK coupling 54 (see
Figure 3). This connects the suppressor module directly to
the high-pressure pump.
• Set the flow rate for the high-pressure pump to 0.5 mL/min
and rinse the suppressor unit with 1 mol/L H
2
SO
4
for 5 … 10
minutes.
• As the pressure falls, slowly increase the flow at the high-
pressure pump to 2 mL/min. Do not exceed the maximum
pressure of 2 MPa (20 bar).
• Switch off the high-pressure pump.
• Switch the suppressor to the next position using the
button.
• Set the flow rate for the high-pressure pump to 0.5 mL/min
and rinse the suppressor unit with 1 mol/L H
2
SO
4
for 5 … 10
minutes.
• As the pressure falls, slowly increase the flow rate at the high-
pressure pump to 2 mL/min. Do not exceed the maximum
pressure of 2 MPa (20 bar).
• Switch off the high-pressure pump.
• Switch the suppressor to the next position using the
button.
• Set the flow rate for the high-pressure pump to 0.5 mL/min
and rinse the suppressor unit with 1 mol/L H
2
SO
4
for 5 … 10
minutes.
• As the pressure falls, slowly increase the flow rate at the high-
pressure pump to 2 mL/min. Do not exceed the maximum
pressure of 2 MPa (20 bar).
• Switch off the high-pressure pump.
3 Connect the suppressor to the IC system
• Reconnect the suppressor inlet capillaries 45 and 42 nor-
mally again (see Figure 3).
• If the pressure problems persist, replace the suppressor rotor
(see Section 6.2.8).