Product Introduction
The Bently Nevada 3500/33 (Part Numbers 133388-01 and 133396-01) is a 16‑Channel Relay Module for the 3500 Series machinery protection system. The combination consists of the main relay module (133388-01) and a matching internal termination board (133396-01) that provides screw‑terminal connections for field wiring. The module provides 16 independent, programmable relay outputs that can be used for alarming, shutdown, or control logic based on data received from other 3500 monitors (e.g., vibration, position, speed, temperature). Each relay can be configured for latching or non‑latching operation, normally energized or de‑energized states, and can be assigned to any combination of alarm conditions across the rack. The 3500/33 occupies one full‑height slot in a 3500 rack and is compliant with API 670.
Parameters
| Parameter | Specification |
|---|---|
| Relay Module (133388-01) | |
| Model / Part Number | 3500/33 133388-01 |
| Product Type | 16‑Channel Relay Module |
| Number of Relays | 16 (independent, form C) |
| Contact Rating | 5 A at 240 Vac / 30 Vdc (resistive) |
| Relay Output Options | Latching or non‑latching, normally energized or de‑energized, programmable |
| Input Source | Internal 3500 backplane (data from monitor modules) |
| Slot Width | 1 full‑height slot in 3500 rack |
| Dimensions (W × H × D) | 24.9 × 241.3 × 218.4 mm (0.98 × 9.50 × 8.60 in) |
| Weight (module only) | 0.9 kg (2.0 lbs) |
| Termination Board (133396-01) | |
| Part Number | 133396-01 |
| Function | Internal termination / barrier strip for field wiring (16 channels) |
| Connector Type | Removable screw terminals (accepts up to 16 AWG wire) |
| Dimensions (W × H × D) | 19.0 × 76.2 × 50.8 mm (0.75 × 3.0 × 2.0 in) (approx.) |
| Weight (board only) | 0.1 kg (0.22 lb) |
| Combined Weight | 1.0 kg (2.2 lbs) |
| Operating Temperature | 0 to +65 °C (32 to +149 °F) |
| Storage Temperature | –40 to +85 °C (–40 to +185 °F) |
| Humidity | 5% to 95% non‑condensing |
| Response Time | < 50 ms (typical) |
| Certifications (typical) | CSA, ATEX, IECEx (for safe area rack installation) |
Application Scenarios
Multi‑Parameter Alarm and Shutdown – Used on steam turbines, gas turbines, centrifugal compressors, and large generators where multiple independent protection functions (vibration, thrust, temperature, speed) must each trigger dedicated relays for annunciation or trip logic.
High‑Density Relay Applications – Provides 16 relays in a single slot, saving rack space compared to using multiple 4‑channel 3500/32 modules. Ideal for large machinery trains with many monitored points.
Voting Logic (1‑out‑of‑2, 2‑out‑of‑3) – Relays can be configured in software to implement redundant voting schemes for critical applications such as overspeed protection in nuclear plants or offshore platforms.
Direct Control of External Systems – Drives plant DCS, PLC, emergency shutdown systems (ESD), or audible/visual annunciator panels with dry contact closures from each relay.
Retrofit of Legacy Relay Panels – Replaces older 3300 series relay modules or discrete relay logic panels in existing 3500 racks, simplifying wiring and allowing software‑based configuration of alarm logic without hardware changes.
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