We generally block these voltages using isolation for safety reasons and to. The isolator's output is powered by the input loop power and drives passive loads only. Signal Isolation is important because it blocks hazardous voltage between circuits. When adding a field device such as a recorder or display, no additional power source is required for the added loop or for the isolator. Other signal isolators are useful when adding and isolating a monitoring instrument to an existing current loop. Since both the input and output signal are 4-20mA, location of the device is not critical. Usually, the isolator is located close to the field device. Since output and power share the same two wires, this type of isolator can be placed anywhere between the field sensing device and the PLC/DCS or monitoring device. The isolator must control current draw from the power supply in the output loop which is the 4-20mA signal. Some signal isolators are ideal for applications that require an isolator with a power supply in series with the output signal. Why You Need USB Isolation for Industrial I/O (Whitepaper).How to Choose a 4-20mA Isolator (App note).Why Do I Need Electrical Isolation? (Whitepaper).Top 3 Ethernet Industrial Isolation Papers: Find more application notes, white papers and support here: Many times choosing the right isolator requires more than just comparing the number of channels and the cost per point. Signal isolator adopts digital calibration, automatic zero calibration, DIN rail installation way and no potentiometer, with strong input/output/power supply isolation, fast response, low-power dissipation, and good anti-interference performance. As your I/O experts, Acromag is here to help! Below are three of our most popular application notes and whitepapers related to our signal isolators. Signal isolator is suitable for industrial field with severe signal interference.
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