What is oxidation reduction potential(ORP) instrument?

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Definition

Oxidation reduction potential (ORP) instruments( redox potential instruments) are use to monitor chemical reactions. 

ORP instruments measure the ability of a solution to act as an oxidizing agent, and to quantify ion activity. 


Construction

As shown in  figure, there is a two solution  separated by porous membranes. the function of porous membrane is isolate two solution physically but hydrogen ions can pass through this membrane for electrical current transfer.

Two electrode are immersed in the solution as shown in the figure one is made of zinc and one is made of copper. One current metre is also connected between these two electrodes.

This arrangement is called voltaic cell or galvanic cell.

Working

in the voltaic cell under consideration, zn dissolves into the solution as zn 2 + ions and liberate two electrons.

 Liberated electrons travel along the external circuit to neutralize Cu 2 + ions at the Cu electrode.
 
Like this electrical current can flow in the circuit. Which  is measured by current metre(ammeter).

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