These instruments are made up of a transformer an amplifier and a transistor, a rectifying circuit and one or two output relays with changeover contacts, respectively in the ALNC and ALN2 types.
They are used to supply with a stabilized and level 12 Vdc voltage inductive and capacitive sensors and photocells.
The electronic unit of the two models is assembled in a plastic housing with terminal block.
The ALNC model is very versatile as it permits the use of a sensor with NPN, PNP or NAMUR logic. The ALN2 type allows for the use of two NAMUR sensor.