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.
Our design engineers and tech support team has heard and seen just about everything when it comes to level sensors and pressure transducers. Today, we want to cover the top ten things to NOT do with a pressure sensor.
The order of this list was determined based on two factors: frequency of the mistake, and the seriousness of the offense.
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.
Part 4 of our PG10 digital pressure gauge data logging series covers viewing, stopping, and clearing logs. For now, you can access the last 60 data logs via the user-interface on the PG10. However, there is software for full data logging capabilities. Look for that release in the near future. For now, check out the video below: