Watson-Marlow 620U - Manual (Page 71)

Watson-Marlow 620UN, 620U, 620SN, 620S User Manual 71
Connect a momentary contact switch such as a footswitch or a handswitch between
pins 8 and 9 of the lower D-connector. Close the switch to begin a dose. This input
is software-debounced and functions in a similar way to the other remote inputs,
such as with 5V to 24V logic as shown above, using pin 8 as the input and pin 20 as
the 0V (lower D-connector). Note: This input is software-debounced, so the signal
can be either momentary or maintained during the dose. If maintained, the signal
must be removed before the next dose.
21.8 Leak detection input
21.7 MemoDose input
Connect a remote leak-detection device
between pins 2 and 18 of the upper
D-connector. Closed circuit indicates a
leak. Alternatively a logic input may be
applied to pin 2 of the upper D-connec-
tor, ground to pin 15. High input
indicates a leak. Connect a Watson-
Marlow leak detector in the same way,
drawing 12V to power it from pin 21 of the upper D-connector.
Connect the cable of a Watson-Marlow Tube monitor leak detector as follows:
Tube monitor
wire colour Pin number
upper D-connector
Blue 15
Yellow 2
Red 21
Note: Use only a Watson-Marlow 620 series tube monitor.