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13.3.
Special Settings for Filter Applications
Two dimensions are needed to set up the EchoSmart unit for filter applications: the
distance from the Sensor to the Media (SM), and the Depth of the expandable Media
(DM). Installation recommendations and a guide to help determine correct input
dimensions are found in Figure 13.1 below. SM should be measured after installation
of the sensor. The setup parameters can then be implemented as follows:
Units
: Set to Inches (or Centimeters)
A smaller measurement unit provides finer resolution in the output
measurement.
Tank Depth
: SM + DM
(The measured distance from the Sensor to the Media (SM) plus the Depth of
the Media (DM)).
Zero Adjust
: Set to zero (0.0)
Min Range
: Set to 12 inches
Update Rate
: Set to 8
Interface
: Set to LAST
Dampening
: Set to 5
Max Range
: SM + 4 inches
(The measured distance from the Sensor to the Media plus 4 inches)
4mA Set Point
: 0.0
(This locates the zero Level at the bottom of the expandable media. See Figure
13.1)
20mA Set Point
:
Tank Depth (SM + DM, Figure 13.1)
Additional notes:
The initial measurement and 4-20 mA output should equal the depth of the
expandable media (DM). If the output does not match the known media depth,
check the SM measurement and adjust the Tank Depth value accordingly.
Depth of Media is NOT a directly measured value. Accuracy of this
measurement and changes over time depend on a correct starting DM provided
by the user.
If the Tank Depth value is changed, Max Range will need to be re-calculated
and set to the new value
after
the new Tank Depth is entered.
If a narrower 4-20 mA span is desired, caution should be taken not to reduce
the span such that it does not allow for media expansion during backwash or
loss of media over time. The 4-20mA set points for turbidity are factory set to
0-50 NTU. Any data collection devices should be scaled accordingly.
All other parameters should be left at factory defaults unless directed by Entech
Design or one of their representatives.