YSI 6500 Environmental Process Monitor - Manual (Page 34)

System Setup Section 3
Now highlight the “Is:” selection and use the Enter key to toggle between “above” and “below”.
When the proper selection has been made, press Enter to confirm it (“above” in the example”).
Next highlight the “Set point=“ selection and press Enter. Use the up and down arrows on the
keyboard to adjust the parameter value to the point where the relay will be activated (18 C in the
example) and press Enter to confirm the selection. With the above setup, the first relay will be
enabled (and its associated alarm will be active) whenever the temperature is above 18 C.
The “Hysteresis” (dead band) serves to eliminate relay “chatter” around the set point.
To set up the remaining three available relays, scroll horizontally with the right and left arrows in
the screen shown directly above to access the Relay setup menu for the additional menus and then
configure them from this display as described above. Press Esc to return to the Configure Relays
menu as shown below. Conditions are now set for all four relays.
In the above example, Relay 1 will be enabled if the temperature is above 18 C, Relay 2 will be
enabled if DO is less than 5.00 mg/L, Relay 3 will be enabled if specific conductance is greater
than 2 mS/cm, and Relay 4 will be enabled if the pH is less than 7.00.
After the relays have been set as desired, press Esc to return to the Main menu.
3.3.4
4-20 MA CHANNEL SETUP
YSI Incorporated 6500 Environmental Process Monitor 30