Solid State Controls employ two separate circuits, one for sensing and comparing current flow and one for energising the output relay. This switch within a switch allows solid state controls to operate at much lower secondary voltages (12VAC typical), and much higher sensitivities. Advantages of this technology include reduced shock hazard, one moving part the output relay, wide sensitivity range and latching capability for auto refill or empty applications.
Intrinsically Safe Controls are solid state controls which limit current and voltage to a level incapable of igniting flammable gasses, vapours or dust. They can be used as conductivity liquid level control devices or with dry contact devices such as Gems Flow Switch and Level Switch devices or other non voltage storing or producing devices.