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Brand: Bently Nevada
Bently Nevada 149992-01 3500/33 16-Channel Relay Output Module
Description
Bently Nevada 149992-01 16-channel relay output module for the 3500/33
The Bently Nevada 149992-01 is the spare 16-channel relay output module for the 3500/33 relay system. In the manufacturer’s spares list it is the standard-contact version, listed next to 149992-02 (failsafe), 149992-03 (low current) and 149992-04 (low current failsafe). It is the rear I/O module that holds the sixteen relay contacts, while the logic runs in the separate 3500/33 control module, spare number 149986-01.
The ordering code for the full assembly is 3500/33-AA-BB, where A selects the output module type. Position A code 01 is the plain 16-channel relay output module, which is the version 149992-01 represents. Seven Star LLC supplies 149992-01 in Oman and the GCC as an independent supplier in Muscat.
Decoding 149992-01 against the 3500/33 ordering table
| 3500/33 option | Output module | Spare part |
|---|---|---|
| A01 | 16-channel relay output module (standard silver contacts) | 149992-01 (this part) |
| A02 | 16-channel failsafe relay output module | 149992-02 |
| A03 | Low current 16-channel relay output module (gold-plated contacts) | 149992-03 |
| A04 | Low current 16-channel failsafe relay output module | 149992-04 |
| B (approval) | 00 none, 01 cNRTLus Class I Division 2, 02 ATEX/IECEx/CSA Class I Zone 2 | Set on the complete assembly |
149992-01 technical specifications
| Parameter | Specification |
|---|---|
| Manufacturer / part number | Bently Nevada (Baker Hughes) / 149992-01 |
| Description | Spare 16-channel relay output module, standard contacts |
| Relay type | Single-pole double-throw (SPDT), epoxy-sealed |
| Channels | 16 relay outputs, each independently programmable for voting logic |
| Relay contact life | 10,000 cycles |
| Arc suppression | 250 Vrms suppressor installed as standard |
| Relay mode | Four groups of four channels, switch selectable as normally de-energized (ND) or normally energized (NE) |
| DC rating, standard systems | Maximum 5 A; 70 W at 24 Vdc, 10 W at 48 Vdc, 9 W at 60 Vdc; maximum 125 Vdc; minimum load 100 mA at 5 Vdc |
| AC rating, standard systems | Maximum 5 A, 1200 VA, 250 Vac |
| Failsafe and hazardous-area systems | Maximum 30 Vdc, 5 A DC; the datasheet restricts voltage on these versions |
| Control module power | 5.8 W typical (main module) |
| I/O module size | 241 x 24.4 x 99.1 mm (9.50 x 0.96 x 3.90 in), 0.4 kg (1.0 lb) |
| Rack space | One full-height rear slot (control module takes one full-height front slot) |
Contact ratings depend on the version and approval of the full assembly. For SIL or hazardous-area use the datasheet restricts the switched voltage, so read the ordering considerations in the manufacturer datasheet before wiring higher voltages.
How the 16-channel relay module drives alarms
Each relay carries Alarm Drive Logic that you program in the 3500 Rack Configuration Software. The logic combines alarm inputs (alert and danger statuses), Not-OK conditions and individual measured values from any monitor channel in the rack, using AND and OR gates. Any relay can therefore be a simple alarm, a voted trip such as two out of three, or a status contact for the control system.
The OK, TX/RX and per-channel alarm LEDs on the control module show whether the module is healthy, communicating over the rack backplane and which relay is in alarm. The rear module 149992-01 holds the physical contacts and the field terminals, so a failed contact or damaged terminal is solved by replacing the output module, not the control module.
Where 149992-01 fits in a 3500 rack
The 3500/33 can be placed in any slot to the right of the Transient Data Interface (TDI), and several modules may be fitted. The datasheet states that it requires 3500 Rack Configuration version 3.3 or later, Data Acquisition 2.40 or later and Data Display Software 1.40 or later. Related items are the 149986-01 control module, and the 3500/22M TDI that sits at the left of the rack.
- 149986-01: spare 16-channel relay control module that pairs with the output modules.
- Connector header 00580453 (16-position, green internal termination) and the push-in-spring alternative 166M2381.
- 162291: 3500/33 user guide.
- 04425545: single-use grounding wrist strap for module handling.
Selection checklist for 149992-01
- Choose standard contacts ({P}) when switching loads of 100 mA at 5 Vdc and above, as in most shutdown and annunciator circuits.
- Choose the low current types (149992-03 or -04) with gold-plated contacts for loads between 1 mA at 1 Vdc and 100 mA at 48 Vdc, typical of PLC inputs.
- Choose a failsafe type (149992-02 or -04) when the safety case requires it; these have the lower voltage limit.
- If the load is near the transition between low and high current, the datasheet recommends the gold-plated low current option.
- Match the approval option of the existing assembly (none, Division 2 or Zone 2).
Installation, commissioning and maintenance
Disconnect field power before servicing, because relay terminals can carry hazardous voltage and the datasheet warns of shock hazard at higher voltages. Fit the module only in a de-energized circuit or follow the site hot-swap procedure for the 3500 rack. Confirm the four ND/NE selector switch groups match the original settings, since they decide whether a relay is normally energized or de-energized.
After installation, simulate an alarm from the Rack Configuration Software or the monitor test function and check each relay’s continuity with a meter. Record the contact operation count where the site tracks it, remembering the rated life of 10,000 cycles. Keep at least one spare output module for each contact type in the plant spares store.
Typical applications in Oman and the GCC
Relay modules turn a monitoring result into an action: a turbine trip, a compressor shutdown, a high-vibration alarm in the control room. In Oman and the GCC they are found on gas turbine generators, mechanical-drive compressors, boiler feed pumps and seawater pumps in oil and gas, power, desalination and petrochemical plants. Relay contacts see heat, dust and humid coastal air inside marshalling cabinets, so periodic checks are worth planning at each turnaround.
Relay output module versions compared
| Version | Spare number | Contacts | Typical use |
|---|---|---|---|
| Standard | 149992-01 | Silver | General alarm and trip circuits above 100 mA at 5 Vdc |
| Failsafe | 149992-02 | Silver | Safety-related circuits with restricted voltage |
| Low current | 149992-03 | Gold plated | PLC and DCS digital inputs, 1 mA at 1 Vdc minimum |
| Low current failsafe | 149992-04 | Gold plated | Low-level circuits in failsafe configuration |
Information to send with your RFQ for 149992-01
- Part number 149992-01 and quantity.
- Module labels from the front control module and the rear output module, including revision.
- Load type, voltage and current of the connected circuits.
- Rack location, country of delivery and delivery date.
Related Bently Nevada products: Bently Nevada 3500/32M 4-Channel Relay Module, Bently Nevada 3500/33 16-Channel Failsafe Relay Output Module – 149992-02, Bently Nevada 149369-01 3500/25 Enhanced Keyphasor Module, Bently Nevada 3500/50 Tachometer Module, Bently Nevada 128240-01 3500/42M Prox/Seismic I/O Module and Bently Nevada 3500/50M Tachometer Module.
Documents and quotation
The 3500/33 16-Channel Relay Module datasheet is attached on this page and is the source of the ratings above.
Send the part number 149992-01 and your rack details, and Seven Star LLC will confirm availability, condition and lead time for Oman and the GCC.
Datasheets & Documents
- Datasheet Bently Nevada 3500/33 Relay Module Datasheet Download
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About brand
Bently Nevada is the American machinery protection and condition monitoring brand behind the 3500 rack, the 3300 XL proximity probe and the System 1 software. It was founded in 1961 in Minden, Nevada, and is today a Baker Hughes business.
Seven Star LLC is an independent supplier in Muscat. We list Bently Nevada monitors, I/O modules, probes, proximitors, velocity transducers and transmitters for rotating equipment in Oman and the GCC, and source them by full part number.
Bently Nevada company profile
| Established | 1961, Minden, Nevada, USA, by Donald E. Bently. The business started earlier as Bently Scientific in Berkeley, California (1956). |
|---|---|
| Known for | The first commercial eddy-current proximity transducers for measuring shaft vibration and position on high-speed turbomachinery |
| Ownership | Acquired by GE Energy in 2002; part of Baker Hughes since GE Oil & Gas combined with Baker Hughes in 2017 |
| Rack generations | 5000 series (from 1965), 3300 series (from 1988), 3500 series (from 1995), Orbit 60 (current platform) |
| Product families | Machinery protection racks, proximity probes and proximitors, Keyphasor sensors, velocity and acceleration transducers, 2-wire vibration transmitters, general-purpose monitors, portable analyzers, wireless sensors and System 1 condition monitoring software |
| Typical machines | Steam and gas turbines, centrifugal and reciprocating compressors, pumps, motors, generators, fans and gearboxes |
Milestones
- 1956: Donald E. Bently starts Bently Scientific in Berkeley, California.
- 1961: The company moves to Minden, Nevada, as Bently Nevada.
- 1965: The 5000 series monitoring system is introduced.
- 1988: The 3300 series follows.
- 1995: The 3500 machinery protection system is launched.
- 2002 and 2017: GE Energy acquires Bently Nevada; it becomes part of Baker Hughes in 2017.
Bently Nevada product series
| Series | Type | What it does |
|---|---|---|
| 3500 | Machinery protection rack | Continuous online protection with alarm and danger relays. Modules include the 3500/15 power supply, 3500/20 rack interface, 3500/25 Keyphasor, 3500/42M proximitor/seismic, 3500/50 tachometer, 3500/60 temperature, 3500/33 relay and 3500/92 communication gateway |
| 3500 recip modules | Reciprocating compressor monitoring | 3500/70M impulse velocity, 3500/72M rod position and 3500/77M cylinder pressure |
| Orbit 60 | Protection and monitoring platform | The current Bently Nevada platform for protection, condition monitoring and data integration with System 1 |
| 3300 XL 8 mm | Proximity transducer system | Probe, extension cable and proximitor sensor for radial vibration, thrust position and Keyphasor reference on fluid-film bearing machines; also 5 mm and 25 mm versions |
| 330500 Velomitor, 190501 Velomitor CT | Piezo-velocity sensors | Casing velocity on rolling-element bearing machines and low-speed cooling tower fans |
| 990 and 991 | 2-wire transmitters | 4-20 mA vibration (990) and thrust position (991) signals straight into a PLC or DCS, without a monitor rack |
| 1900/65A, 2300 | Compact monitors | Protection for balance-of-plant pumps, fans and motors where a full 3500 rack is not justified |
A proximity probe measures the gap to the shaft, so it sees shaft movement inside a fluid-film bearing directly. A velocity or acceleration sensor sits on the casing and suits rolling-element bearing machines. Critical turbomachinery usually carries two X-Y probes per bearing, two axial probes for thrust position and a Keyphasor probe for speed and phase.
Where Bently Nevada systems are used
In Oman and the GCC, Bently Nevada racks and probes protect gas turbines, compressors and steam turbines in gas processing, LNG, refining, petrochemical, power and desalination plants. Many installations are 3500 racks that have run for years, so most requests are for like-for-like module, probe, extension cable and proximitor replacements, plus upgrades to newer monitors.
Ordering and replacement: what we need
For probes and proximitors, send the full part number with all option digits (for example 330101-00-27-10-02-05). The digits set the probe length, cable length, connector and approvals, and the probe, cable and proximitor must match in total system length. For 3500 modules, send the module and I/O part numbers from the rack and say whether the I/O is internal or external termination, or barrier type. If a module is obsolete, we quote the replacement that Bently Nevada names and point out any configuration or firmware change.
Facts checked against Baker Hughes Bently Nevada pages and published company history, October 2026.
Browse Bently Nevada products by category: Vibration.
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Frequently Asked Questions
What is the Bently Nevada 149992-01?
It is the spare 16-channel relay output module for the 3500/33 relay system, the standard silver-contact version. It is listed in the manufacturer's spares table beside the failsafe, low current and low current failsafe versions.
What is the difference between 149992-01 and 149992-03?
149992-01 uses standard silver contacts with a minimum load of 100 mA at 5 Vdc. 149992-03 is the low current type with gold-plated contacts, rated from 1 mA at 1 Vdc to 100 mA at 48 Vdc.
Can each relay be programmed separately?
Yes. Each of the 16 outputs has Alarm Drive Logic with AND and OR gates and can use alert and danger statuses, Not-OK and measured variables from any monitor channel in the rack.
What are the contact ratings for standard systems?
The datasheet gives 5 A maximum, 70 W at 24 Vdc, 10 W at 48 Vdc, 9 W at 60 Vdc, 125 Vdc maximum, and for AC 5 A, 1200 VA at 250 Vac. Relay contact life is 10,000 cycles.
Does 149992-01 need the control module?
Yes. The logic runs in the 3500/33 control module (spare 149986-01), and the output module carries the contacts. The 3500/33 needs Rack Configuration software 3.3 or later.
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