Watson-Marlow qdos H-FLO Reference Manual page 219

26.3.2.1 Removing pumphead
1. Stop pump.
2. Isolate pump from electrical power.
3. Release pressure in fluid path and drain down fluid path in accordance with your
organisation's procedure for this step.
4. Remove the fluid path connections and safety overflow connection, from pumphead
ensuring that the pump is protected from any fluid spillages.
5. Fit safety overflow rubber cap to the safety overflow of the pumphead.
6. Release the pumphead locking lever by hand. Do not use tools to move the locking lever.
7. Disengage the pumphead from drive by rotating it in a clockwise direction by
approximately 15°.
8. Remove the pumphead, being aware residual chemicals will remain inside the
pumphead tubing/fluid connection ports, which will require draining, in accordance with
your organisation's procedure for this step.
9. Check that the leak detect sensor and driveshaft are both clean and free from process
chemical. If any evidence of chemical residue is found, remove pump from service and
contact your local Watson-Marlow representative for advice.
10. If the pumphead had not failed, dispose of the pumphead in accordance with local
regulations. If the pumphead failed, carry on to step 11
11. Drain the pumphead of chemicals and pumphead lubricant of residual chemicals in
accordance with your organisations procedure for this step, by unscrewing the drain
valve shown in the picture below:
12. Dispose of the pumphead in accordance with local regulations.
CAUTION
Risk of injury due to burns. The exterior of the pump and driveshaft can
get hot during operation. Stop the pump and let the pump cool before
handling.
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