Introduction to the Bently Nevada 3500/40 140734-01 and 135489-04
The Bently Nevada 3500/40 140734-01 is a 4-Channel Relay Module for the 3500 Machinery Monitoring System. It is not a sensor itself, but a logic and action module that provides relay outputs based on the status of other monitoring modules (like vibration, position, or speed modules) in the same rack.
The 135489-04 is a 5 mm Proximity Transducer System (probe, extension cable, and driver). This is the actual sensor that measures the relative displacement (vibration) and position of a shaft relative to its bearing.
How They Work Together:
The 135489-04 proximity probe system measures the shaft's dynamic vibration and average position (gap voltage). This signal is sent to a separate monitoring module in the 3500 rack, typically a 3500/42M Proximitor® Monitor (not the 3500/40). The 3500/42M module conditions the signal, compares the vibration and position values to user-defined Alert and Danger setpoints, and then communicates this status to the rack. If a dangerous condition is detected, the 3500/42M alerts the 3500/40 Relay Module. The 3500/40 then activates its physical relay to shut down the machine (a "trip") or initiate an auxiliary alarm, thus protecting the asset from severe damage.
Key Parameters
The following table outlines the key specifications for both components.
| Parameter | 3500/40 140734-01 (Relay Module) | 135489-04 (5 mm Proximitor® Kit) |
|---|---|---|
| Part Number | 140734-01 | 135489-04 |
| Description | 4-Channel Relay Module | 5 mm Proximity Transducer System Kit |
| System Compatibility | Bently Nevada 3500 Rack | Compatible with Bently Nevada monitors (e.g., 3500/42M) |
| Module Slot Width | Single Slot | N/A (External Sensor) |
| Dimensions (H x W x D) | Approx. 193 mm x 21 mm x 260 mm (7.6 in x 0.83 in x 10.24 in) | Probe: 5 mm diameter, length as per order Proximitor: Approx. 80 mm x 40 mm x 60 mm |
| Weight | Approx. 0.45 kg (1.0 lb) | Kit Weight: Approx. 0.5 - 0.7 kg (varies with cable length) |
| Key Function | Provides up to 4 Form-C relay outputs for machine shutdown or alarm. | Measures shaft relative vibration and position (radial or axial). |
| Channels/Outputs | 4 independent relay channels. | 1 channel. |
| Relay Contacts | Form-C (SPDT - Single Pole Double Throw). | N/A |
| Input/Signal | Receives logic commands from other modules in the 3500 rack. | Output: -2 VDC to -18 VDC gap voltage (position), plus AC vibration signal. |
| Probe Diameter | N/A | 5 mm |
| Linear Range | N/A | 0.5 mm (50 mils) typical, +/- 2.5 mm from electrical null. |
| Sensitivity | N/A | 200 mV/mil (7.87 V/mm) ± 2% |
| Operating Temperature | -20°C to +65°C (rack operating temp) | Probe: -35°C to +177°C Proximitor: -55°C to +120°C |
Application Scenarios
This combination is fundamental for protecting high-speed, high-value rotating machinery where immediate shutdown is required upon detecting a fault.
Gas and Steam Turbine Trip Systems:
The 135489-04 probes monitor radial vibration on the turbine shaft. If vibration levels exceed the Danger setpoint (indicating potential rub, unbalance, or bearing failure), the 3500/40 Relay Module is activated to immediately shut down the turbine, preventing catastrophic damage.
Centrifugal Compressor Protection:
Probes measure shaft vibration and axial thrust position on critical compressors in oil & gas and chemical plants. A dangerous axial displacement reading will trigger the 3500/40 relay to trip the compressor driver (usually a motor or turbine) to avoid thrust bearing failure and rotor damage.
Large Motor and Generator Protection:
Used on the bearings of large motors and generators. The system protects against excessive shaft vibration that can lead to bearing wear, fatigue, and insulation failure. The relay module provides the hardwired safety interlock to the motor control center (MCC).
Auxiliary Alarm Indication:
While often used for trip functions, the 3500/40 relays can also be configured to activate auxiliary alarms (e.g., warning lights or horn) when an "Alert" level is reached by the vibration monitor, giving operators an early warning of deteriorating machine condition.
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