Xylem PC320 Process Controller - Manual (Page 16)

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SAVE to store the setting. The Sensor Warmup time is how long the sensor will be
powered on before a reading is taken, consult the sensor manual. Set this parameter in
the same manner as the sample rate. In this example the backlight is in 1 minute mode.
The sensor will be turned on for 3 seconds every 60 minutes. The display and 4-20mA
output will remain on but will continue to indicate the flow that corresponds to the last
sensor measurement. During the time the sensor is off, the display will show the last
reading and the relays will continue to operate based that.
Relay Settings:
To change Relay Settings, press the RIGHT arrow button. For more information on
relay modes please consult the section of this manual titled Relay Operation.
Each relay is independent of the others and can be programmed separately. Use the
UP and DOWN arrows to select which relay is to be changed, press MENU to move to
the next sub-menu.
Each relay must have upper and lower threshold defined. Depending on the relay
mode, the relays will trigger when the sensor reading rises above the upper threshold
or below the lower threshold. If only one threshold is needed, set the other threshold
outside of any normal sensor reading. By default these settings are stored as +/-
9000000 so false triggering should be prevented.
Once a relay number is selected, press Menu. Use the arrow buttons to set the +/- sign,
each digit, and decimal point for each threshold number. Press SAVE. Do this for
both the upper and lower thresholds as needed. The next menu defines a hysteresis
percentage. Use the arrow buttons to set hysteresis and SAVE, then press MENU. Set
a delay time as needed and SAVE. The last two sections set the On and Off times for
the relays. Use the arrows and SAVE to change these. Note that not all of these
settings make any changes to relay operation, what effect they have depends on the
relay mode selected for each relay and the sensor reading.