Relay And External Equipment Operation; Chapter 7: Appendix A: Relays, Menus And Alarms; Relays - Blue I HydroGuard HG-302 Manual De Uso

6.5.7.2 Technical Menu
1. Press up and down together to enter the technical menu
2. Press Scroll until "Turbidity ON/OFF" appears in the display and press enter
3. Enter the technician password and press enter
4. Press up to turn the turbidity sensor on and press enter
5, Press Scroll until "Turbidity Wiper Interval" appears in the display and press enter
6. Enter the technician password and press enter
7. Enter the wiper interval (2 minutes is recommended) and press enter
The turbidity unit should now be active. Confirm that the turbidity value appears on the LCD display. If it is
not active, perform a system reset.

6.5.8 Relay and External Equipment Operation

The relay will operate in an ON/OFF mode. Whenever the measured turbidity is below the set point, the
relay will remain open (no power to normally open connection). Whenever the measured turbidity is above
the turbidity set point, the relay will close (power will be supplied to the normally open connection).
If the measured turbidity is above the turbidity high alarm, the alarm on the controller will be activated. The
NTU relay will remain closed (power to the normally open connection) even during alarm.

Chapter 7: Appendix A: Relays, Menus and Alarms

This chapter lists HydroGuard's relays, menu commands, alarms, and system technical data.
7.1

Relays

Listed below are the HydroGuard's relays and the systems they connect to:
Relay
1
2
3
NTU (Numeric Turbidity Units) - Controls the injection of flocculants and coagulants. Used
4
only with the optional turbidity module. See turbidity module documentation.
5 Alarm - Activates an external (third party) alarm when certain alarm types are registered.
6 Temperature - Controls water temperature by activating the water heating system.
Control
Cl 1 - Main chlorine system
Cl 2 - Secondary chlorine system
pH - Acid or base dosing
68