Xylem FC220 OPEN CHANNEL FLOW MONITOR - Manual (Page 13)

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RIGHT arrow to move to the level unit, the units will flash. Use UP and DOWN to
select the unit that corresponds to the high level that was just set. Press SAVE to store
these settings. Press MENU to move forward. Press the SAVE button to store the raw
data value for the high level sensor output. Press MENU to move to the level offset
option. The level offset is added to (or subtracted from) the measured water level to
correct for errors in installation. For example, if a sensor is installed horizontally in
the bottom of a pipe you can add the radius of the sensor housing to make up for the
fact that the sensor output will not change until the water level reaches the center. The
radius of the WL400 sensor is 0.41” and the radius of the FL400 sensor is 0.50”. Use
the arrows to set the level offset. Set the first character to either + or – to add or
subtract the offset respectively, select the remaining characters from 0-9 and decimal
point. Press SAVE to store the offset value.
4-20mA Output Calibration:
To scale and calibrate the 4-20mA output press the RIGHT arrow key. The 4mA Set
Point is the amount of flow that results in an output current of 4mA, generally zero.
Use the arrow buttons to change the setting. Use the RIGHT arrow to advance to the
volume unit until it flashes. Use UP and DOWN to select the volume unit. Use the
RIGHT arrow to advance to the time unit. Use UP and DOWN to select the time unit.
Press SAVE to store these settings and MENU to move forward. The 20mA Set Point
is the magnitude of flow that causes a 20mA output current. Use the arrow buttons to
change the set point value, the units are those selected in the previous menu. Press
SAVE to store this setting. Any flow between these two set points will be scaled to the
corresponding output current. The next three menus are generally set at the factory
and should not need to be changed. The 4mA Output Cal menu allows the 4-20mA
output to be set to exactly 4mA. Connect a DC current meter between the 4-20mA
output and ground. Use the UP and DOWN arrows to raise and lower the raw data
number (and output current) until the current meter reads exactly 4.000mA. Press
SAVE and MENU. The 20mA Output Cal menu sets the 20mA output in the same
way. Use UP and DOWN to adjust the output until the current meter reads exactly
20.000mA. The Calibrate Logger menu is used to recalibrate the FC220 data logger
option only and will be discussed in the section titled Data Logger Option and in the
Data Logger Option software manual.