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23 paź 2024 · We mentioned that 4-20mA transducers can be loop-powered. Figure 2 shows a simplified diagram of how this can work. A voltage to current converter converts the sensor output to a 0 to 16mA current. In parallel a fixed 4mA current source provides the power supply via a shunt regulator.
The purpose of this note is to describe a simple circuit which can achieve high performance, using standard pressure sensors, operational amplifiers and discrete devices.
Abstract: This reference design shows how to develop a high-performance, high-voltage 2- or 3-wire 4–20mA current-loop transmitter suitable for industrial process control and smart sensors. Error analysis and overtemperature characterization data as well as hardware design and software are provided.
19 lip 2017 · The most common standard is the 4-mA-to-20-mA current loop, and here we’ll take a look at how it came to be, how it works, and how you can leverage this basic process control...
Adding isolation to the 4-20mA current loop protects system electronics from electrical noise and tran-sients. It also allows transducers to be electrically separated by hundreds of volts. Burr-Brown now offers all of the integrated circuit building blocks needed to assemble com-plete isolated 4-20mA current-loop systems.
Handheld Voltage and Current Source 4-20mA: This instructable details how to make a 0-20mA +/-10V signal generator using an inexpensive LM324 opamp. These type of signal generators are useful in industry to test sensor inputs or drive industrial amplifiers.
The AD693 is a monolithic signal conditioning circuit which accepts low-level inputs from a variety of transducers to control a standard 4–20 mA, two-wire current loop.
