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A very common output signal for sensors of all kinds, 4-20mA has a few very good reasons why it has been so popular for so long:
Long Cable Runs
The 4-20mA output allows for cable runs over 1000 ft. with almost no signal degradation and without regard to any voltage drops in the wire.
Back up pump control is a critical part of any pump control application, ensuring that failure does not result in a potentially hazardous overflow or the unwanted emptying of a tank. Ideally, back up sensors work independently from the control system, so that failure of the primary controls will not disable them.
Rapidly changing liquid levels can overwhelm a single pump, and cause excessive wear and tear. To prevent this, additional pumps can be added to control the liquid level.
As sensor design engineers and manufacturers, liquid level sensors and pressure transducers can be broken down into two types: purpose built and field configurable.
Poly tanks are used throughout the world for bulk liquid storage and processing. They are durable, lightweight, and compatible with many chemicals. Naturally, not all of these tanks will be installed where a control system is present. When level control is needed in these circumstances, a stand-alone solution is the only option.
A slight customization we did for a customer quite a while ago has become more popular recently: putting a cable between the actual pressure transducer and the digital display on a digital pressure gauge.
With ultrasonic sensors, the most reliable distance readings are obtained when unwanted echoes are reduced or eliminated. This is done when the sensor is set to the minimum power and sensitivities needed to accurately read a target.
Simplex pump control is a relatively simple task. A float switch with a bit of hysteresis will do just fine. There are, of course, continuous level sensors that may be advantageous under the right circumstances.
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