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Determining The Minimum Specific Gravity Difference Between Two Liquids
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.
Remote networks are very useful in monitoring remote tanks. These can be monitored on a nearby local network or over the Internet from virtually any location. How, then, can you get a network or Internet connection to a remote location?
When selecting a level sensor or pressure transmitter, the output of the sensor is always an important criterion. Outputs have more implications than whether or not they match the control system, though that is often the immediate need.
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.
Ultrasonic level sensors are great at measuring the distance, or level, of many different material targets. However not all targets are created equal:
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.
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