Bently Nevada 88984-02 3500 Dual Internal Barrier

Product Description

The 88984-02 is a specialized internal safety barrier module for the Bently Nevada 3500 Series Machinery Protection System. Known as the "Dual Epoxy" module, it provides essential intrinsic safety protection for transducer signals entering the 3500 rack from hazardous areas. By limiting the electrical energy transmitted into field wiring, the 88984-02 prevents ignition of flammable atmospheres in the event of an electrical fault.

Constructed with high-quality epoxy encapsulation, this module offers superior environmental protection and long-term durability. Its dual-channel configuration allows multiple signal paths within a single compact footprint, making it ideal for high-density monitoring applications. The module is specifically engineered to interface with Bently Nevada proximity probes and sensors, ensuring signal integrity while strictly complying with global explosion-proof and intrinsic safety standards.

Technical Specifications

• Manufacturer: Bently Nevada (Baker Hughes)

• Part Number: 88984-02

• Device Type: Internal Intrinsic Safety Barrier

• Construction: Dual-channel, epoxy-encapsulated for moisture and vibration resistance

• System Compatibility: Bently Nevada 3500 Series Monitoring Racks

• Input Protection: Limits voltage and current to field-side transducers

• Circuit Type: Galvanically isolated or shunt diode (depending on rack grounding)

• Application: For use with Proximitor® sensors, Accelerometers, and Velomitors®

• Safety Certification: Designed to meet ATEX, IECEx, and CSA standards for hazardous areas

• Mounting: Internal installation on the 3500 system backplane/I/O modules

• Operating Temperature: Standard industrial range optimized for rack interiors

Application Scenarios

The 88984-02 is used in facilities where rotating machinery operates in Zone 0, Zone 1, or Division 1 hazardous locations, such as:

• Gas turbine enclosures

• Pump houses in refineries

• Hydrogen compression stations

By integrating the barrier directly into the 3500 rack, it eliminates the need for bulky external barriers, saving space and simplifying wiring.

Technical FAQ

Q: What is the benefit of an "internal" barrier versus an external one?
A: Internal barriers like the 88984-02 simplify wiring, reduce cabinet space requirements, and ensure the barrier is perfectly matched to the 3500 module’s electrical characteristics. This reduces signal attenuation and improves the accuracy of vibration readings.

Q: Is the 88984-02 compatible with all 3500 I/O modules?
A: No. It must be used with specific "internal barrier" versions of I/O modules, such as the 3500/40M or 3500/42M, which have physical slots to accommodate the epoxy blocks.