Watson-Marlow 720UN and 720SN User Manual
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19.8 Auto / manual toggle input
Connect a remote switch between the
+5V
terminal and the
i/p
terminal of the Auto-man i/p connector (J1). Closed
switch for automatic control; open switch for manual control.
Alternatively a logic input may be applied to the
i/p
terminal of the Auto-man i/p connector, ground to the
0V
ter-
minal. High input for automatic control; low input for manual
control.
19.9 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
termi-
nal and the
0V
terminal.
Note
: This input is software-de-
bounced, so the signal can be either momentary or
maintained during the dose. If maintained, the signal must
be removed before the next dose.
19.10 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 Wat-
son-Marlow Tube monitor leak detector as follows:
Note
: Use only Watson-Marlow 720 series leak detectors.
Tube monitor wire colour
720N module
Blue
J9 0V terminal
Yellow
J9 i/p terminal
Red
J9 +12V terminal
Terminate the screen in the 720N module with a 360° EMC
gland if required. See 19.2
Wiring up
.
