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Brand: Bently Nevada
Bently Nevada 138607-01 3500/22M TDI Main Module
Description
Bently Nevada 138607-01 3500/22M standard TDI module for the 3500 rack
The Bently Nevada 138607-01 is the main board of the 3500/22M Transient Data Interface, the module that takes Slot 1 of a 3500 machinery protection rack and links the rack to a host computer over Ethernet. In the ordering structure published by the manufacturer the 3500/22M is built from a TDI type, an I/O module type and an agency approval code. The main module carries the processing, the front-panel controls and the rack-wide functions; the I/O module that plugs in behind it decides whether the Ethernet link is copper or fiber.
Seven Star LLC supplies this module in Oman and the GCC as a replacement or expansion spare for existing 3500 racks. The part number is the one commonly used for the standard TDI main module; confirm it against the label on the board in your rack before ordering, because the I/O module and the dynamic data enabling disk are separate items.
138607-01 technical specifications
| Parameter | Specification |
|---|---|
| Manufacturer / part number | Bently Nevada 138607-01 (3500/22M Transient Data Interface, standard type) |
| Operating temperature | -30°C to +65°C (-22°F to +149°F) |
| Storage temperature | -40°C to +85°C |
| Humidity | 95%, non-condensing |
| Power consumption | 10.5 W |
| Rack position | TDI module: 1 full-height front slot, always Slot 1 beside the power supplies; I/O module: 1 full-height rear slot |
| Front panel | USB-B configuration port, OK / TX-RX / TM / CONFIG OK LEDs, rack reset button, address switch, RUN/PROGRAM keylock |
| Main module size and weight | Datasheet gives 0.91 kg (2.0 lb) for the main module; I/O module 0.20 kg (0.44 lb) |
| Software | 3500 Rack Configuration software and System 1 Condition Monitoring and Diagnostic software over Ethernet |
| Ethernet options (via I/O module) | 10Base-T / 100Base-TX autosensing, or 100Base-FX fiber optic with MT-RJ connector |
| OK relay | 5 A at 24 Vdc / 120 Vac, 120 W / 600 VA maximum; gold-plated contact versions rated down to 1 mA at 1 Vdc |
| Compliance listed | FCC, EMC Directive 2014/30/EU, LV Directive 2014/35/EU, RoHS 2011/65/EU, DNV GL and ABS maritime rules |
| Hazardous area (with I/O) | cNRTLus Class I Division 2 / Zone 2 and ATEX/IECEx Ex nA nC ic IIC T4 Gc at Ta -20°C to +65°C, when installed per the cited drawings |
Values are taken from the 3500/22M datasheet. Approvals depend on the I/O module and the agency option chosen at ordering, so they are not a property of the main board alone.
What the 138607-01 does inside the rack
A 3500 rack needs one interface module, and the 3500/22M combines the job of the older 3500/20 Rack Interface Module with the data collection normally done by an external communication processor. It sits next to the power supplies and talks to the monitor modules (3500/40M, 3500/42M and the other M-series monitors) across the rack backplane. Static values are always available. With an optional channel enabling disk it also gathers dynamic waveform data and transient data during startup and coast-down, then streams everything to the host over Ethernet.
The module is not part of the protection path. Alarm decisions are made in the monitors, so replacing or reconfiguring the TDI does not change how a trip is generated. It does, however, hold the rack-wide controls: the rack reset, the address switch with 127 possible addresses, and the keylock that selects RUN or PROGRAM mode. In RUN mode configuration changes are locked out; PROGRAM mode permits local or remote reconfiguration.
Compatible modules and related part numbers
The 138607-01 is the main board only. It is paired with an I/O module: 146031-01 for 10Base-T/100Base-TX copper, 146031-02 for 100Base-FX fiber, and the gold-plated variants 146031-03 and 146031-04. The same datasheet lists 288055-01 as the standard TDI module supplied with a USB cable. Racks upgrading from a 3500/20 RIM should check that the installed M-series monitors are supported, because the manufacturer warns that some monitors are not compatible with the 3500/22.
Related but separate parts include the 3500/22M 100Base-FX I/O module 146031-02 and the older 3500/20 data manager I/O board 125760-01, which belong to different rack-interface generations and are not interchangeable with the TDI I/O.
Selection and ordering checklist for 138607-01
- Confirm the rack already runs, or will run, M-series monitors and System 1 or 3500 Configuration software that supports the 3500/22M.
- Decide between copper and fiber Ethernet, which fixes the I/O module you must buy with the main board.
- Check whether a dynamic data enabling disk is needed. The disk sets how many steady-state and transient points are available; the sum of both fields must not exceed 672.
- State the agency approval needed (none, CSA/NRTL/C Class 1 Division 2, or multi-approval CSA/ATEX/IECEx).
- Confirm the rack firmware and the 3500/22M firmware revision are compatible before a field swap.
- Ask for the condition: new, new surplus or tested spare.
Installation, commissioning and care
Follow the upgrade sequence in the datasheet whenever a TDI replaces a RIM: remove the RIM, remove the RIM I/O, insert the TDI I/O, then insert the TDI. Leaving the old RIM I/O in the rack can damage the new TDI. Use anti-static handling, record the rack address switch setting, and confirm the configuration with the keylock in PROGRAM before returning it to RUN.
After power-up check the OK, TX/RX and CONFIG OK LEDs, then connect with the 3500 configuration software and verify that the configuration read back from the rack matches the saved file. The module has a battery listed in the datasheet environmental section, so include a stored-configuration backup in your maintenance routine.
Typical use in Oman and the GCC
3500 racks protect compressors, steam and gas turbines, pumps and fans in oil and gas, power generation, desalination and petrochemical plants across the region. In those plants the TDI is what lets the reliability team see startup transients and alarm captures from the control room or a remote diagnostic centre. Hot, dusty or humid switch rooms are normally handled at the cabinet level, so keep the rack within the -30°C to +65°C limit and avoid condensation when equipment is moved from air-conditioned stores.
Variant overview: 3500/22M modules
| Part number | Description |
|---|---|
| 138607-01 | Standard 3500/22M main module |
| 288055-01 | Standard TDI supplied with a USB cable |
| 146031-01 | 10Base-T/100Base-TX I/O module |
| 146031-02 | 100Base-FX fiber-optic I/O module |
| 146031-03 / 146031-04 | Gold-plated OK relay versions of the copper and fiber I/O modules |
Handling and spares planning for 138607-01
Keep at least one tested 138607-01 on site when the rack feeds a remote diagnostic centre, because the TDI is the single path for Ethernet data from a 3500 rack. Store it in its anti-static bag at a stable temperature, away from direct sun and humidity. When you plan a spare, note the I/O module and the dynamic data enabling disk that go with the 138607-01, since a rack that received a new TDI without its disk will only deliver static data until the disk is available again. Record the serial number and firmware revision of every installed module in the plant asset register so that a replacement can be matched quickly.
If the rack is part of a larger network, agree the IP addressing and the 3500 Hardening Guide measures with your IT and cyber-security team before the 138607-01 goes live.
Information to send with your RFQ
- Part number 138607-01 and quantity
- Rack model and slot configuration, plus the monitor types installed
- Existing TDI or RIM part number and firmware
- Copper or fiber Ethernet preference and agency approval
- Delivery location in Oman or the GCC and required condition
Related Bently Nevada products: Bently Nevada 128240-01 3500/42M Prox/Seismic I/O Module, Bently Nevada 125680-01 3500/40M Proximitor I/O Module, Bently Nevada 149369-01 3500/25 Enhanced Keyphasor Module, Bently Nevada 3500/50M Tachometer Module, Bently Nevada 3500/20 Rack Interface Module and Bently Nevada 3500/32M 4-Channel Relay Module.
Documents and quotation
The manufacturer datasheet for the 3500/22M family is attached on this page; read it together with your rack configuration and the site specification before confirming an order.
Seven Star LLC is an independent supplier in Muscat serving Oman and the GCC. Stock position, lead time, condition and the certificates that travel with the shipment are confirmed in the written quotation.
Datasheets & Documents
- Datasheet Bently Nevada 3500/22M TDI 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 138607-01?
It is the main board of the 3500/22M Transient Data Interface for the 3500 rack. It occupies Slot 1 and carries the processor, front-panel controls and rack-wide functions. An I/O module is fitted behind it.
Does the 138607-01 include the Ethernet I/O module?
No. The Ethernet connection comes from the separate I/O module, 146031-01 for copper or 146031-02 for fiber. Both must be fitted for the TDI to communicate.
Is the TDI part of the protection path?
No. The datasheet states that the TDI is not in the critical monitoring path. Monitor modules make alarm decisions, so a TDI fault does not stop protection from operating.
What does the dynamic data enabling disk do?
It sets how many channels of steady-state and transient waveform data the TDI can collect. The two fields together may not exceed 672, and one disk can serve several TDIs.
Can it replace a 3500/20 RIM?
Yes in most racks, but follow the datasheet order of removal and check that the installed M-series monitors are compatible with the 3500/22 before upgrading.
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