Watson-Marlow qdos H-FLO Reference Manual page 51

11.1.3.4 Safety overflow
All pumphead models have a hose barb safety overflow, as illustrated below
In the unlikely event of a leak detection sensor failure, the safety overflow provides a safe leak
path for mixture of fluid and lubricant.
The pumphead has a factory fitted rubber cap on the safety overflow, which is unplugged, but
not removed during installation of the safety overflow.
During installation remove the rubber cap from the opening to allow the safety overflow
pipework connected, without removing the rubber cap item completely.
The safety overflow must flow away from the pump into a system designed to:
• Be vented
Allow no back flow, due to pressure or blockage
•
Have sufficient capacity
•
Be obvious to user that fluid can be seen flowing in the event of a safety overflow event
•
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