Signal isolators are used to provide galvanic isolation between field circuits and control circuits.
They prevent electrical noise from interfering with signals.
Isolation ensures reliability and accuracy for low voltage/amperes in control circuits.
They protect equipment and personnel from dangerous voltage levels.
They can also be use to drive multiple devices like chart recorders off of a single field analog signal.
A signal isolator is used in a PLC system mainly to protect, stabilize, Noise Reduction and accurately transfer signals between field devices and the PLC.
To protect signal from induction current it’s connected between field and DCS card
It’s an safety relay system for small special motors
A signal isolator is used to minimize the current to acceptable level for hazardous area application zone 0,1and 2 as well which will not cause an explosion.
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