Float switch, and other point level sensors, are great alternatives to the more expensive continuous level sensors (ultrasonic, radar, level probes, etc.). Functionally, of course, they are not as capable. However, they work great under the right circumstances and continue to be a staple in level measurement applications throughout the world.
Float
switch,
and other point level
sensors,
are great alternatives to the more expensive continuous level
sensors
(ultrasonic,
radar, level
probes,
etc.). Functionally, of course, they are not as capable. However,
they work great under the right circumstances and continue to be a
staple in level measurement applications throughout the world.
When
To Use
The
right time to use a float
switch
is tied to the application goals. What does the sensor need to do? If
the answer to that question is only to perform a repeatable action at
a specific and consistent level, then a float
switch
just may be a good sensor.
For
example, a custom float
switch
sensor would work if you're using a rudimentary level indication such
as turning on and off lights when a certain level is met.
A
more common application is lift station pump control. A lift station
pumps water or wastewater out of a wet well to higher ground where
gravity can continue to carry it down the line. Cable suspended float
switch are
often used to turn on a pump as the level in the wet well rises. For
larger lift stations, there are several pumps, each turned on by a
single switch activated as the level rises faster than the previous
pump can handle.
The
examples above represent common point level sensor usage. However, if
the sensor needs to do more than simply initiate an action at a
specific level, then a float
switch
no longer makes sense. The same is true for any point level
technology.
When
Not To Use
Continuous
level
sensors
provide the most flexibility. These sensors can be used to accomplish
all the tasks that a point level sensor can, but with a variety of
added benefits.
You
will know it's time to look for a continuous level
sensors
when you become concerned with the accuracy of a level or a volume
measurement, or when switching to a continuous sensor can save money
or increase efficiency.
Point
level
sensors
are inadequate for level measurement or monitoring. They simply
activate notifications, alarms or control measures to keep liquid
level within pre-defined boundaries. They cannot give measurements or
provide the advanced control that relies on real-time data.
Applications
that do not require a continuous level
sensors
may still benefit from having one. A good example of this is the
development of pumps with a variable speed motor. These pumps are
controlled by a continuous level sensor and run as fast or slow as
needed - rather than simply on or off. This saves energy, is
environmentally friendly, and will often result in a quick return on
investment.
Float
switch,
and other point level switches, are great for simple control and cost
less than continuous measurement. However, it's important to study
your application and the equipment that can improve your process. You
may be able to upgrade sooner than you think.
Article Source: http://www.compensationsecrets.co.uk/.
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