Whitepaper: Two-Wire Transmitters and 4-20mA Loops
Feb. 8, 2012
A whitepaper that explains the proper way to use and install transmiters in a current loop is now available from Acromag.
As the leading analog transmission standard for industrial I/O, the future continues to look bright for the 4-20mA current loop. The current loop's lossless nature, lower-sensitivity to induced noise, live-zero offset, fail-safe operation, easy scalability and abundance of inexpensive compatible devices make it very popular. Loop-powered two-wire transmitters and isolators/splitters which considerably simplify installation and conversion of real world signals (flow, level, temperature, pressure, etc.) into 4-20mA, continue to evolve with modern technologies.
But despite their popularity, two-wire transmitters and 4-20mA loops are often misapplied and many misconceptions exist. This white paper explains the proper way to use and install transmitters in a current loop. You'll also learn how to determine required supply voltages, filter out noise, add fault protection, and compensate for wire resistance.
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