BUCHI Pump Module C-605 - Manual (Page 42)

8 Troubleshooting
42 Pump Combinations Operation Manual, Version E
Table 8-2: Error messages of the Pump Manager C-615 (cont.)
Error number Possible cause Remedy
22 Cooling fan in pump B not working. Contact Customer Service.
23, 24 EEPROM C-615. Contact Customer Service.
26 Pressure higher than max. pressure settings. Lower the flowrate, if possible, increase the max.
pressure
27 Unexpected restart. Restart.
28 Check solvent level A. Refill solvent bottle A.
Check level sensor position.
Check level sensor adjustment.
29 Check solvent level B. Refill solvent bottle B.
Check level sensor position.
Check level sensor adjustment.
30 No pressure sensor connected. Check connection; otherwise, contact the BUCHI
customer service
8 .2 Pulsation of a pump module
A repeated strong pulsation of the pumps suggests that the opening or closing times of the inlet or
outlet valves are not correct.
Possible causes:
Improper use:
• The solvent filter is not used. When the filter is not used, particles, dust and fibers can enter the
valves and affect their functionality.
• The sample mixture is introduced to the separating column with the pumps. The pumps are exclu-
sively designed to pump solvents.
Using technical solvents:
Technical solvents are normally not free of polar residues. Especially during extended standstill periods
these residues can adhere to the polar surface of the sapphire valve seat or the ruby valve ball and
influence the closing speed. In the worst case the valve can jam.
Possible sealing abrasion in the outlet valve
Each sealing is subject to a permanent abrasion during its service life. This abrasion is especially high
at the beginning during the so-called running in phase of the sealing. For small flow rates the flow
speed within the valve might be too low for a self-purification of the valves. For continuous flow rates
of under 10 ml/min we recommend to rinse the pumps at least once a week according to the proce-
dure described below.
Solving the problem:
• Rinsing the pump module:
– Disconnect the pressure tubing between the pressure sensor and the injection system, so that
the rinsing solution does not contaminate the separating column.
– Rinse the pump module with a high flow rate with ethanol or chloroform ( >150 ml /min for two
minutes).
ATTENTION
Do not pump the solvent round in circles. The solvent may only be reused after distillation.