Decontamination of plugged BPR heads may require more aggressive solvents. In this case use the following procedure:
Depressurize the SFC Control Module completely.
Disconnect the BPR inlet and outlet tubes from the BPR drawer.
Attach the Inlet tube via a transfer line to waste.
Attach a solvent pump to the outlet tube of the BPR head
Prime the pump with a suitable solvent for the obstructing material.
Flush backwards with strong solvent at 1 mL/min for 20 minutes. Do not exceed a pressure of 400 bar.
If the pump cannot transfer fluid at less than 400 bar discontinue the operation and perform steps to exchange the BPR head.
If the backflush is successful, rinse the BPR head with Isopropanol for 10 minutes at 1 mL/min to clear the strong solvent.
Reconnect the BPR inlet and outlet lines.
Complete the standard decontamination procedure listed above
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