Xylem PC320 Process Controller - Manual (Page 6)

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III. Display Modes
The PC320 has three display modes, pressing the DISPLAY button on the front panel
cycles through them: Sensor Reading > Max/Min > Relay Status > Sensor Reading ...
Sensor Reading
The top line shows the sensor type. The second line shows the current sensor reading
and units updated once each second. The brackets to the right of the sensor reading
indicate the current on or off status of each of the 4 relays, relay 1 to the left and relay
4 to the right. When the brackets are filled the relay is on. In the above example, relay
2 is on and the others are off.
Max/Min
This display mode shows the minimum and maximum readings since last reset. To
reset the display, press SAVE for 2 seconds. Pressing SAVE also turns off all 4 relays.
Once reset, the relays will not trigger again for 15 seconds.
Relay Status
This display mode shows the current status for each of the relays. Use the UP and
DOWN arrow buttons to scroll through relays 1-4. The top line shows the relay
number, whether it is currently on or off, and how many seconds remain in the on or
off cycle, if applicable. Depending on the relay mode selected, the on and off times
may not apply and would not be displayed. The bottom line shows if that relay has
been triggered since last reset. If the relay has been triggered, the sensor reading at the
time of triggering is shown. If the relay has not been triggered, “None” will be
displayed. The relays are turned off and the status reset when the SAVE button is
pressed for 2 seconds. Once reset, the relays will not trigger for 15 seconds. In the
above example, relay 1 is currently off with 125 seconds remaining before it is turned
on again. The relay was last triggered by a sensor reading of 3015.22 uS.