JUNE 2007 ISSUE
NEW EchoPod Ultrasonic Mini Level Controller/Transmitter
EchoPod� ultrasonic level controller and transmitter provides a total automated
solution for level control of fluids. EchoPod uses sound waves to sense liquid level,
replacing floats, conductance and pressure sensors that are sensitive to dirt, sticking
and scaling. EchoPod offers non-contact switch, controller and transmitter capabilities
in one compact package. Featuring 4 relays, 4-20mA output and pump/valve control,
EchoPod is perfect for small tanks/vessels 49.2" (1.25m) or less and well suited
for corrosive and dirty applications. Features include non-contact ultrasonic level
switch, controller and transmitter capabilities with 2" dead band and beam
width. Rugged PVDF housing provides for resistance to a wide range of corrosive,
waste or slurry-type media environments. Level indication can be monitored via a
local display or via PLC. EchoPod integrates process or control automation of small
tanks mounted on tools, skids or machines. Ideal applications include day tanks,
process vessels or dispensers, pump lift stations, waste sumps. Accuracy to 0.125"
(3mm), Signal outputs: 4-20mA, 2-wire. Contact type: (4) SPST relays 1A. CE approval.
Configured using WebCal pre-programmed menus. If you would like more information
on EchoPod Ultrasonic level controllers call 1.800.848.1141. One of our RHFS level
control specalists will be happy to assist you. For more info, visit us on the web
at: www.rhfs.com
Filtration Control
To remove suspended solids for many processes the pre-coat
or diatomaceous earth (DE) filters are used to remove any suspended solids. There
are many processes that require a physical separation of one of more on the components.
It is important to know when any separation process has failed or is not operating
efficiently. This results in the high concentrations of suspended. There need to
be some type of monitor to detect filter failure to minimize downstream contamination.
A continuous filter separates solids by entrapping the suspended material in the
filter medium while allowing the liquid portion to pass. The build-up the trapped
solids will increase the pressure drop across the filter. The Mettler Ingold Forward
Scatter Model 8300/8200 is designed to measure levels of turbidity before and after
the filter. If very low levels are expected or required (0-500 ppm) it is best to
measure the filter product with the Mettler Ingold Forward Scatter Model 8300FS/8400.
Forward scatter is best for extreme low levels of turbidity. Turbidimeters have
also been use to monitor and control the DE addition and dosing. By monitoring the
addition we can assure the proper amount of DE is applied to the filter. This optimizes
DE usage and filter performance. This is done by using the analyzer to detect when
the filtered product is below the required level. The dual benefit is maximum on-line
time and minimum DE usage. .
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