Computers, pumps, lights, motors, conveyors, and other pieces of machinery all depend on electricity to function. Electricity is the lifeblood of the modern industry. One would be hard-pressed to name a product that doesn’t require an electrical input somewhere within its manufacturing process. What does a current transducer do?
A DC current or voltage output directly proportional to the AC input current is provided by current transducers. To keep the transducer separate from the current input, AC current transducers typically have a transformer input.
For a more general overview, be sure to read through “What is a Current Transducer” for a basic understanding of this instrument. Are you eager to learn how this contact-free feature functions? Investigate the current transducer’s interior to solve its mystery.
Table of Contents
What Is A Current Transducer?
In order to produce a signal as its output, a current transducer reads current. In this instance, the sensed current is translated (transduced) into a proportional output (milliamp or voltage). There are several output types available, including 4–20 mA, 0–5 VDC, 0–10 VDC, 1 vac, and 0.333 vacs. So that a current reading can be generated, the software can interpret the output range.
Applications: Load trending, motor control, and fan/pump status are other things that current transducers keep track of.
Function Of Current Transducer
1. Magnetic Field
The process wire carrying the electrical current that we want to measure is where we started. A proportional magnetic field is produced all around that wire by the current flowing through it. And lastly, a sensor inside an instrument detects the magnetic field when the wire is passed through the aperture of a current transducer. Induction allowed for the detection of the magnetic field.
2. Data Translation
We were able to create a proportional copy of the current we were trying to measure, but we still need to convert the measured data into a signal that can be read. Voltage is the outward sign of the replicated current that we have sensed. Because of its small size and potential for distortion, that voltage is very weak. “The process of adjusting that minute, measured voltage to create a data stream that is clearer and more defined than the original information is referred to as “signal conditioning.”
3. Data Transmission
Now that we have a precise representation of the measured process current, the current transducer’s final task is to transmit the data. A computer or other device will be present to receive the information and display, process, or act on it. But it needs to be presented in a way that computers can understand, and voltage is a concept they don’t grasp.
On the current transducer’s board, the circuitry will convert the measured process into data that a computer can understand. Current transducers’ data output could be digital, but it’s more likely that it will take the form of a typical analog signal, such as 0…10V or 4…20mA. This kind of standardization is essential not only for the current transducers but also for the entire process control ecosystem. It enables the translation of measured data from a variety of variables, including pressure, temperature, and flow rate, into a universal language. You’ll want to read through our discussion on “What exactly is an analog signal?” to get a better understanding of this modern standard.
And that’s basically how a current transducer operates. We covered a lot of ground in our discussion of this amazing device that makes automation and process control in the modern world possible. Check out our “Question and Answer Guide: “ if you still have some unanswered queries about this instrument and how it functions. Where we look into some of the finer points of measuring current in Current Transducers. Don’t forget to look through our selection of Enercorp Current Sensors, which will provide you with some examples of this straightforward but incredibly useful tool in action.
Different Types Of Current Transducers
There are two categories of AC current transducers:
Absolute average measuring, RMS calibrated (or mean value measuring, RMS calibrated).
These low-cost transducers simply convert the AC input to DC and have the output calibrated to represent the root mean square (RMS) value for sine wave input. This kind is excellent for circumstances where the current wave shape is not altered. Any unusual harmonic or discontinuity will result in a significant error. When there is sine wave distortion, use the true RMS measuring type.
True RMS (root mean square) measuring
These transducers determine the RMS value of the current input and deliver a DC output that is directly proportional to the actual value of the current input. When the current is distorted, this type ought to be used.
Difference Between Active And Passive Transducers
An active transducer needs external power to produce a signal, which could be produced by some kind of excitation, signal processing, integrator circuit, amplifier, or other electronics. Active transducers are the majority of modern transducers.
The inherent characteristics of whatever the transducer sensor detects generate a signal in a passive transducer. A thermocouple, for instance, produces a voltage based on a change in temperature without the need for an external power source.
The Bottom Line
Transducers are machinery that changes the form of energy. Transducers are present all around us, as you can now see. In a variety of ways, they improve our quality of life.
The more accurately we can measure, the more we can utilize our tools, designs, and products. Transducers play a significant role in the comforts of contemporary society.