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Always measure the steam liquid flow rate and reset the peristaltic pump speed so the
flow rate is correct after replacing the tubing. Run the pump for one hour before setting
the pump speed to stretch the tubing.
9.3 Peristaltic Pump Flow Rate Measurement
The tubing in the peristaltic pump will stretch over time with use. Changes in the tubing
may impact the liquid flow rate delivered by the pump for a given speed. Follow these
procedures to verify the peristaltic pump liquid flow rate:
1. Disconnect the peri pump steam heater liquid flow tube from the barb connect-
ing it to the teflon tube leading into the chassis to the steam heater.
2. Tape the graduated cylinder to the bench top next to the peri pump so it won't
fall over.
3. Set the loose end of the peri tube into the top of the graduated cylinder.
4. Ensure that liquid is available in the steam generator liquid supply bottle.
5. Verify that the tube supplying water to the peri pump from the bottle is sub-
merged inside the bottle.
6. Procure a stopwatch to time the liquid volume dispense time.
7. Turn on power to the PILS and start your stop watch. The peri pump will au-
tomatically begin pumping liquid. Operating the steam heater without water
flow will not damage the unit. Start the timer when you see water drops first
dispensing into the graduated cylinder.
8. For a 5 minute dispense, 7.5 ml should accumulate for a 1.5 ml/min flow rate.
Stop the peri pump by turning off power and stop the stopwatch at the same
time power is removed and measure the volume dispensed in the graduated
cylinder.
9. If the measured flow rate is different than 1.5 ml/min by more than 5%, adjust
the potentiometer and repeat the measurement until the measured flow rate is
1.5 ml/min.
83-00009-01A
PILS 4001-115V and 4001-230V
9.3 Liquid Flow Rate
Page 62 of 74
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