Xylem FC220 OPEN CHANNEL FLOW MONITOR - Manual (Page 16)

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Power Saving Mode:
The power saving mode allows the average power consumption to be reduced by
controlling the time when the water level sensor and LCD backlight are turned on. To
set the power saving parameters, press the RIGHT arrow button. The LCD Backlight
has 3 settings, ON turns the backlight on all the time, OFF forces the backlight to be
off, and 1 Minute mode will turn the backlight on when any button on the keypad is
pressed, then it will turn off again after one minute of inactivity. Use the UP and
DOWN arrows and SAVE to set and save the setting. The Sample Rate is the interval
between sensor readings (and how often the display and 4-20mA output will be
updated). Use LEFT and RIGHT to select a digit and use UP and DOWN to scroll
through 0-9, press SAVE to store the setting. The Sensor Warmup time is how long
the sensor will be powered on before a reading is taken. 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
level measurement. During the time the sensor is off, the totalizer and relays will
continue to operate based on the last sensor reading.
Relay Settings:
To modify Relay Settings, press the RIGHT arrow button. Each relay is independent
of the others and must 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. The
Volume of Pulse setting is the amount flow needed to generate a relay pulse. The relay
number selected is shown at the lower right. If a relay is not used, enter zero and no
pulses will be generated. Use LEFT and RIGHT to select a digit, and UP and Down to
scroll through the numbers. Use the RIGHT arrow to move to the volume units, select
using UP and DOWN. Press SAVE to store the setting. The Minimum Threshold
setting inhibits the counting of pulse volume unless the flow rate is above the threshold
level. The selected relay number is shown at the lower right. Set the threshold level,
volume unit and time unit in the same way, then press SAVE. In the above example,
relay 2 will be pulsed for every 100 cubic feet of water as long as the flow rate is over
10 cubic feet per second. Any water flow while the flow rate is below the 10 cubic
feet per second threshold will not be counted toward the 100 cubic foot pulse volume.