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Bently Nevada P3403893-0351 Vibration Transmitter

Configured for vibration signal conversion in machinery condition monitoring systems, the Bently Nevada P3403893-0351 (P3403893 vibration transmitter) provides direct electrical execution. It accepts the signal from a compatible eddy-current proximity probe and extension cable, conditions the measurement, and delivers a proportional 4-20 mA loop output for connection to control and monitoring equipment.

Suffix Breakdown & Model Matrix

The available documentation identifies P3403893-0351 as a complete catalog number. No official suffix definition or option matrix is specified in the provided technical data; therefore, no suffix breakdown is presented.

Hardware Specifications

Parameter	Specification
Model	P3403893-0351
Brand	Bently Nevada
Origin	United States
Product Type	Two-wire Loop-powered Vibration Transmitter
Measurement Type	Vibration / Proximity (Eddy-current technology)
Input Compatibility	One non-contacting proximity probe with matching extension cable
Output Signal	4-20 mA DC, loop-powered
Supply Voltage	12-35 VDC
System Accuracy	Within +/- 1.5 % of full-scale range
Maximum Loop Resistance	1000 Ohm at 35 VDC (including cable)
Current Limiting	23 mA typical
Probe Gap Range	0.5-1.75 mm (20-55 mils)
Fault Output	Below 3.6 mA during NOT OK condition
Startup Behavior	Output below 3.6 mA for approximately 2-3 s after power-up
Operating Temp	-40 to +85 deg C
Protection Rating	IP67
Dimensions	7.5 x 6 x 10 cm
Weight	0.55 kg (shipping)
Power Consumption	Derived from 4-20 mA loop current

Eddy-current Probe Scaling and Gap Validation

The P3403893-0351 is intended to operate with a compatible Bently Nevada eddy-current proximity probe system consisting of the probe, extension cable, and transmitter. Proper probe gap adjustment is required before commissioning so the transducer operates within its calibrated measurement range. Gap voltage verification against the target surface is a standard installation practice to confirm sensor linearity and maintain consistent vibration scaling. During a detected transducer fault, the output current falls below 3.6 mA, allowing the receiving PLC, DCS, or monitoring system to distinguish hardware faults from process measurements.

Frequently Asked Questions

Q: Does the transmitter require an external power supply?
A: Yes. The device operates from a 12-35 VDC two-wire current loop and produces a 4-20 mA output.

Q: Can the transmitter operate without a matching proximity probe system?
A: No. The transmitter is designed to function with a compatible non-contacting eddy-current proximity probe and its corresponding extension cable.

Q: How is a sensor fault indicated to the control system?
A: During a NOT OK condition, the loop current drops below 3.6 mA. After the fault is cleared, the transmitter returns to normal operation following its startup inhibit period.

Field Installation Guidelines

• Mount the transmitter in accordance with the environmental limits specified for the installation location.
• Verify probe gap adjustment before placing the monitoring channel into service.
• Route probe cables separately from high-voltage and variable-frequency drive wiring to minimize electromagnetic interference.
• Ground cable shields according to the system grounding philosophy, typically at a single designated point to reduce ground-loop currents.
• Confirm loop supply voltage and total loop resistance remain within the specified operating limits before commissioning.
• Perform functional verification after wiring by checking both normal output current and fault-state output.

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