Watson-Marlow 620U - Manual (Page 63)

Watson-Marlow 620UN, 620U, 620SN, 620S User Manual 63
20.9 MemoDose input
Connect a momentary contact switch such as a footswitch
or a handswitch between the 5V terminal and the i/p ter-
minal of the Dose i/p connector (J3). Close the switch to
begin a dose. This input is software-debounced and func-
tions in a similar way to the other remote inputs, such as
with 5V to 24V logic as shown above, using the i/p ter-
minal and the 0V terminal. 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.
20.10 Leak detection input
Connect a remote leak-detection device between the +12V
terminal and the i/p terminal on the Tube monitor connector
(J9). Closed circuit indicates a leak. Alternatively a logic input
may be applied to the i/p terminal, ground to the 0V termi-
nal. High input indicates a leak. Connect the cable of a
Watson-Marlow Tube monitor leak detector as follows:
Tube monitor wire colour 620N module
Blue J9 0V terminal
Yellow J9 i/p terminal
Red J9 +12V terminal
Terminate the screen in the 620N module with a 360° EMC
gland if required. See 20.2 Wiring up.
Note: Use only Watson-Marlow 620 series tube monitors.