Watson-Marlow 520Du - Manual (Page 68)

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 68
22.8 MemoDose input
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.
22.9 Leak detection input
Connect a remote leak-detection device between pins 2 and 18 of the upper D-con-
nector. Closed circuit indicates a leak. Alternatively a logic input may be applied to
pin 2 of the upper D-connector, 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.