The proximity transducer ALP/3 is constituted by 2 inductive probes 24 V.c.c., they have two separate and adjustable alarms on the whole graduated scale (minimum and maximum range). With the aid of a 3 relays feeder they have an alarm always inserted up to the reset of the initial range preset. The output contacts are in SPDT (NPN or PNP). The feeder, in shockproof plastic custody, has two possibilities of feeding: 110 and 200 V.c.a. Particularly suitable to be installed on flowmeteres of the series BC, BC/K, T, LB.