TQ402 vs TQ403 | Vibro-Meter Sensor Comparison What are TQ402 and TQ403 Proximity Sensors? TQ402 111-402-000-013 and TQ403 111-403-000-013 both famous as non-contact transducer. They are designed situable for shaft vibration and axial position in rotating equipment, widely used in steam, gas and hydraulic turbines, as well as in alternators, turbo-compressors and pumps. TQ402 and TQ403 have an int...