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What is the advantage of a stepped 0-20mA output?

April 26, 2017advantage output stepped

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What is the advantage of a stepped 0-20mA output?

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The 0-20mA signal to PLC’s and DCS systems can be used for warn and alarm conditions along with diagnostics. Should the detector be reading 8mA then there is some type of IR pulsating source present which then allows relocation or adjusting the sensitivity of the unit to overcome this background IR flickering source. This is also true if the output is at 12mA, which indicates UV only. The UV could be coming from arc welding or lightning.