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3-Port Isolation

3-port isolation is the technical standard for all Knick isolators and transmitters, i.e. the input, output and power supply circuit are galvanically isolated from each other. With 3-port isolators, input and output circuits can be set to any user-defined potential as long as the allowable working voltages are observed.

Some manufacturers who do not supply isolators with 3-port isolation as a standard differentiate between input isolators, output isolators, and 3-port isolators.  Again, this differentiation is not necessary to pay close attention to when selecting Knick products, as 3-port isolation is the technical standard here.

Input Isolators
In input isolators, the input is isolated from all other circuits, the output is at the power supply potential. Input isolators are used to isolate an input signal that is at a potentially interfering or high potential from the output and power supply circuit. 

Output Isolators
In output isolators, the input is at the same potential as the power supply. The output signal can be applied to another possibly dangerously high potential.

3-Port Isolators
In 3-port isolators, the input, output and power supply circuits are galvanically isolated from each other (see Fig. 20). The input and output circuits can be applied to any potentials, taking account of the permitted working voltages.

 

 

 

Diagram of a typical 3-port isolator

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