3300/20-03-01

Bently Nevada 3300/20-03-01 belongs to the 3300/20 dual thrust-position monitor design, which continuously observes two independent axial-position channels. The probes should ideally observe the thrust collar directly so that indicated movement relates to thrust-bearing clearance. Preserve the offered 03-01 marking and verify the complete assembly identity before assigning any additional relay, approval or barrier selection.

The monitor accepts one or two proximity signals with a 10 kΩ input impedance and uses 1.5 W nominal power. Input sensitivity is programmable for 200 mV/mil (8 V/mm) or 100 mV/mil (4 V/mm), to match the transducer system. Each channel has an independent recorder output selectable as 4–20 mA, +1 to +5 Vdc or 0 to −10 Vdc; front and rear buffered transducer connections support signal observation.

A transducer gap that leaves its operating range can be interpreted as shaft movement, making probe adjustment and alarm voting essential. The monitor supports OR or AND voting; the manufacturer recommends two probes observing the same collar or shaft with AND voting for thrust applications. Both channels must then reach their setpoints for relay actuation. Verify the actual relay arrangement because quad-relay configurations require external contact wiring for AND voting.