20.5 Limits of intermittent operation
For applications that require the pump to be started and stopped regularly, ANALOGUE, CONTACT or PROFIBUS
control should be used. There is no limit to the number of start/stop cycles using these control methods.
The pump is not designed to be power cycled (turned on and off) as a regular method of starting and stopping the
pump.
20.5.1 Power cycles per hour
Specification
Value
Maximum number of power cycles (pump turned on/off) per hour
20
NOTICE
Do not power cycle the pump either manually or by using the auto restart feature for more than 20 power
cycles per hour. This will reduce the operating life of the product.
20.6 Start up defaults
First-time start-up defaults
Flow rate
qdos120: 960 ml/min
qdos60: 480 ml/min
qdos30: 240 ml/min
qdos20: 120 ml/min
qdos20 PU: 158.4 ml/min
qdos® CWT™: 300 ml/min
Pump status
Stopped
Calibration
qdos120: 16 ml/rev
qdos60: 8 ml/rev
qdos60 PU: 8.8 ml/rev
qdos30: 4 ml/rev
qdos20: 6.67 ml/rev
qdos20 PU: 8.8 ml/rev
qdos® CWT™: 4.9 ml/rev
Flow unit
ml/min
Backlight
30 minutes
Pump tag
WATSON-MARLOW
Auto restart
Off
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