Description
Bently‑Nevada 3500/04‑01 Internal Barrier Earthing Module (138257‑01)
Product Description
The 3500/04‑01 (138257‑01) is a full‑height internal barrier earthing module for Bently‑Nevada 3500‑M‑series machinery‑protection rack. It is a mandatory supporting hardware for the rack‑level intrinsic‑safety (IS) internal barrier solution. When the rack is equipped with internal‑barrier type monitor I/O modules, this module provides dedicated low‑impedance safety grounding reference for zener barriers, ensures energy‑limiting intrinsic‑safety performance for field transducers installed in hazardous areas, and satisfies explosion‑proof grounding requirements of IS system.
This module does not perform signal acquisition, alarm judgment or communication functions. One single 3500 rack with internal‑barrier I/O modules requires exactly one 3500/04‑01 earthing module to be installed, otherwise the intrinsic‑safety certification validity will be lost. OEM production discontinued; supplied only as aftermarket replacement spare for legacy hazardous‑area turbomachinery TSI installations.
Ordering note: Complete order part number：3500/04‑01‑00, main assembly reference code：138257‑01
Technical Specifications
| Item | Specification |
|---|---|
| Complete Assembly PN | 3500/04‑01‑00 (138257‑01) |
| Module Type | Internal Barrier Earthing Module |
| Form Factor | Full‑height rack‑mount module, occupies one full‑height slot |
| Core Function | Provides dedicated low‑impedance safety ground bus for rack internal zener barriers |
| Grounding Requirement | Must connect to plant intrinsically‑safe protective earth point; separate from normal instrument ground |
| Front‑panel Indicator | No measurement LED; mechanical label marking for barrier‑ground function |
| Typical Power Consumption | ＜1 W, no signal processing power load |
| Compatibility | Works cooperatively with internal‑barrier variant I/O modules (3500/40‑IB, 3500/42‑IB etc.) |
| Rack Quantity Limit | Maximum one unit per 3500 rack for internal‑barrier configuration |
| Operating Temperature | ‑30 °C ~ +65 °C (‑22 °F ~ +149 °F) |
| Storage Temperature | ‑40 °C ~ +85 °C (‑40 °F ~ +185 °F) |
| Relative Humidity | 5‑95 % RH, non‑condensing |
| Dimension(H×W×D) | 241 mm × 24.4 mm × 242 mm (9.50 in × 0.96 in × 9.52 in) |
| Approximate Total Weight | 0.42 kg (0.93 lbs) |
| Product Status | Discontinued OEM production, aftermarket spare‑part only |
Important note：After installing 3500/04‑01, the internal jumper setting of 3500/15 power supply must be modified to match internal‑barrier grounding mode, strictly follow official manual procedure.
Key Features & Benefits
- Certified intrinsic‑safety grounding infrastructure: Creates dedicated low‑impedance safety ground bus for rack‑integrated zener barriers, guarantees energy‑limiting characteristic for hazardous‑area proximity probes and sensors, eliminates need for bulk external explosion‑proof barrier boxes.
- Rack‑integrated compact solution: Occupies one standard full‑height slot inside existing 3500 rack; no extra external cabinet space required, simplifies hazardous‑area monitoring system layout.
- System‑level safety matching: Matches Bently‑Nevada internal‑barrier I/O monitors; the whole system obtains unified intrinsic‑safety certification, avoids compatibility risk caused by mixed third‑party external barriers.
- Co‑existence capability for mixed‑mode monitors: Standard non‑barrier monitors and internal‑barrier monitors can run within the same rack when 3500/04‑01 is deployed, supporting gradual project upgrade and retrofit.
- Strict installation constraint enforcement: Enforces dedicated IS‑earth connection; prevents ground‑loop potential difference which may degrade intrinsic‑safety performance.
- Backward‑compatible maintainable architecture: Fits all standard 3500‑M‑series racks. Mechanical hot‑swap physical structure; no configuration software parameter setting required for this module.
Application Fields
- Off‑shore platforms, petrochemical refineries and natural‑gas processing plants: applied for 3500‑M machinery‑protection racks equipped with internal‑barrier monitor modules, supporting proximity probes and speed sensors installed in Class I Div 2 / ATEX hazardous explosive zones for steam turbines, gas turbines and centrifugal compressors.
- Rotating‑machinery monitoring projects requiring intrinsic‑safety explosion‑proof certification for field transducers.
- Spare‑part replacement and system retrofit for legacy 3500 racks configured with internal‑barrier hazardous‑area monitoring solution.
Related Recommended Products
- 3500/05 series: 3500 system rack chassis
- 3500/15 series: Rack power‑supply modules (power‑supply internal jumpers need re‑configuration for internal‑barrier mode)
- Internal‑barrier monitor family: 3500/40‑IB, 3500/42‑IB, 3500/50‑IB etc., I/O modules with built‑in zener barriers
- 3500/22‑01‑01‑00 (TDI): Rack gateway for configuration and event‑log management
- 3500 Rack Configuration Software: For monitor channel setup of internal‑barrier type modules
Installation and Maintenance
Installation
- Insert 3500/04‑01 (138257‑01) full‑height assembly into any available full‑height slot of 3500 rack.
- Modify internal jumper settings of 3500/15 power‑supply modules according to official manual for internal‑barrier grounding mode.
- Connect the rack protective‑earth terminal to site dedicated intrinsically‑safe protective‑earth point, strictly separate from ordinary instrument ground; do not share grounding path with non‑IS equipment.
- Populate rack with internal‑barrier‑type monitor I/O modules as project design; complete field transducer wiring for hazardous‑area sensors.
- Power‑up rack; perform whole‑system intrinsic‑safety installation inspection as per site hazardous‑area engineering specifications.
Important Note: 3500/04‑01 itself has no configuration parameters, no software download needed. One rack with internal‑barrier monitors must install one 3500/04‑01, otherwise intrinsic‑safety certification becomes invalid. This module cannot realize explosion‑proof function independently; it must be used together with internal‑barrier I/O monitor modules.
Maintenance
- Periodically inspect rack protective‑earth connection condition, verify tightness of IS‑ground wiring terminals.
- Check rack event‑log for ground‑relevant diagnostic alarms triggered by internal‑barrier monitor modules.
- No parameter calibration is required for 3500/04‑01. If module replacement is needed, hot‑swap operation is allowed under rack powered‑on condition.
- Avoid mechanical shock and conductive contamination during module‑handling. Refer to Bently‑Nevada official document Doc‑129768 (3500 Internal Barrier System Manual) for full grounding rules and hazardous‑area installation constraints.
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