18.4 Troubleshooting
18.4.1 Pumphead end of life
The pumphead will fail due to :
l
Wear – The pumphead has reached its normal end of life point due to wear of components.
l
Overpressure – As a result of being subjected to a pressure greater than the maximum rating of the
pumphead.
l
Chemical incompatibility – being used with chemicals which are incompatible with the pumphead fluid
path which are normally wetted in normal use.
l
Lubricant leak - The pump has been tilted with the pumphead fitted beyond 20 degrees.
18.4.2 Flowrate
The flowrate of the pump is dependent on :
l
Inlet
and
discharge
pressure
l
Speed of the pump
l
Viscosity of the fluid
l
Condition of pumphead
Actual flow rates achieved may vary to those displayed on the screen because of changes in temperature,
viscosity,
inlet
and
discharge
pressures, system configuration and pumphead performance against time.
For the highest accuracy it is advisable to calibrate the pump on a regular basis.
To determine the cause of the flowrate problem refer to the performance curves in
and determine where on the curve the pump is operating to determine the cause of the problem.
18.4.3 Leak detection message
If, after pumphead replacement, the leak detection message is repeated when the power is cycled, or after the
leak detection reset button has been pressed, remove the pumphead, check that the mounting face is clean and
free of debris and refit the pumphead, taking care to ensure it is correctly orientated with the arrow pointing
upwards.
If the message constantly repeats after several pumphead installations, then there may be a leak detection sensor
failure. Please contact your local Watson-Marlow representative to determine further leak detection
troubleshooting or repair.
18 ERRORS, BREAKDOWN AND TROUBLESHOOTING
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