FTS Bubbler - Using the 4-20 Ma Option to Configure Stage

700-Bubbler-Man Rev 12 13 Feb 2020
Page 19/51
Stage – Use the arrows to input the stage height. The Bubbler will use this value to calculate the
offset which will be displayed on the Status Screen.
Units – Use the up and down arrows to select the measurement units. The displayed Stage value
will automatically be converted to the equivalent stage value in the newly entered measurement
unit.
HINT: When initially setting the Stage, enter the units of measurement first, and then
the desired stage value to prevent inadvertently leaving an erroneous stage height.
MEASUREMENT UNITS
•
in (Inches)
• ft (feet)
• mm (millimeters)
•
cm (centimeters)
•
m (meters)
•
cu (custom)
Explanation:
The desired stage measurement is 3.0 m. The currently entered stage measurement unit is in
feet (ft). When you enter Stage Height 3.0, the Bubbler now recognizes 3.0 ft as the stage
height. If you subsequently change the units to the desired meters (m), the stage height will
be converted to 0.914 (3.0 ft = 0.914 m).
If you do not return to the Stage function and re-enter the correct stage height, the input stage
value will remain as 0.914 m as opposed to the desired 3.0 m.
Slope – Displays the slope. Only appears if units are custom (cu). Insert the desired slope. Note
that the Stage units on the Status screen will be displayed as “cu” not in the unit of
measurement used in the slope calculation.
3.6.1 USING THE 4-20 MA OPTION TO CONFIGURE STAGE
When setting the minimum and maximum values for the 4 and 20 mA outputs, the smaller the
range the more precise the measurements will be, so input minimum and maximum values that are
realistic but which bracket the expected minimum and maximums. For example, if the change in
depth is expected to vary between 10 feet and 25 feet, do not input a range of 0 – 50. A range of
5-30 would be more desirable.
Note that if the units of measurement are changed, the values previously input for 4mA and 20mA
will be automatically converted to the equivalent value in the new unit of measurement.
For example:
Initial values
New Units:
Units Feet Meters
4mA 5 1.52
20mA
25
7.62
These values are automatically
converted to the equivalent
value in the new unit of
measurement