Watson & Sons 520DUN user manual Auto / manual toggle input, MemoDose input, Leak detection input

22.9 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 man- ual control. Alternatively a logic input may be applied to the i/p terminal of the Auto-man i/p connector, ground to the 0V terminal. High input for automatic control; low input for manual control.

22.10 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.

22.11 Leak detection input

Connect a remote leak-detection device between the +12V terminal and the i/p terminal on the Tube monitor connec- tor (J9). Closed circuit indicates a leak. Alternatively a logic input may be applied to the i/p terminal, ground to the 0V terminal. High input indicates a leak. Connect the cable of a Watson-Marlow Tube monitor leak detector as follows:

Tube monitor	520N module
wire colour
Blue	J9	0V terminal
Yellow	J9	i/p terminal
Red	J9	+12V terminal

Terminate the screen in the 520N module with a 360° EMC gland if required. See 22.2 Wiring up.

Note: Use only Watson-Marlow 520 series tube monitors.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 68