Description
Bently Nevada 3500/65-01-00-R0 16-Channel Temperature Monitor
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Bently Nevada / Baker Hughes |
| Model | 3500/65-01-00-R0 |
| Series | 3500 Machinery Protection System |
| Function | 16-channel temperature monitoring |
| Monitor Part Number | 145988-02 |
| I/O Part Number | 172103-01 |
| I/O Configuration | RTD / isolated-tip TC, internal termination |
| Number of Channels | 16 |
| RTD Inputs | 100 Ω platinum, 120 Ω nickel, 10 Ω copper |
| RTD Wiring | 3-wire and 4-wire |
| TC Inputs | Type E, J, K, T |
| Input Impedance | >1 MΩ per lead input |
| RTD Excitation | 913 ±7 µA at 25°C per transducer |
| Resolution | 1°C or 1°F |
| Typical Accuracy | ±3°C at 25°C |
| Cold-Junction Compensation | ±2°C at 25°C |
| Power Consumption | 3 W nominal |
| Operating Temperature | -30°C to +65°C |
| Storage Temperature | -40°C to +85°C |
| Monitor Dimensions | 241.3 × 24.4 × 241.8 mm |
| Monitor Weight | 0.91 kg |
| I/O Module Dimensions | 241.3 × 24.4 × 99.1 mm |
| I/O Module Weight | 0.45 kg |
| Rack Space | 1 full-height front slot + 1 full-height rear slot |
| Alarm Types | Alert and Danger; under- and over-alarm |
| Configuration Software | 3500 Rack Configuration Software |
| Agency Option | 00 = none |
The current OEM datasheet specifies 1–16 RTD or isolated-tip TC signals, 3 W nominal power consumption, >1 MΩ input impedance, and the sensor ranges listed above. The temperature alarm setpoints are software-configurable, with Alert and Danger levels and programmable delays.
Product Introduction
The Bently Nevada 3500/65-01-00-R0 is a 16-channel temperature monitoring assembly within the 3500 Machinery Protection System. It accepts RTD and isolated-tip thermocouple signals, conditions the measurements, and compares them against software-configured temperature alarm limits. Bently Nevada identifies the 3500/65 for bearing metal temperature, thrust bearing temperature, compressor suction/discharge temperature, steam temperature, motor stator temperature, and other machinery/process temperature measurements.
The 01-00 configuration is important. 01 identifies the RTD/isolated-tip TC I/O module with internal terminations, while 00 identifies the configuration with no agency approval option in the OEM ordering structure. The commonly associated hardware is monitor 145988-02 with I/O module 172103-01. The -R0 suffix seen in field and supplier records should therefore be checked against the physical nameplate and installed configuration before treating it as a complete interchange reference.
3500/65-01-00-R0
Application Scenarios & Field Pitfalls — The Engineer’s Perspective
Engineering Pain Point
Temperature monitoring looks simple until a replacement module is installed into an existing machinery protection rack. The sensor type, RTD wiring method, I/O module revision, rack firmware, configuration software, and alarm settings all affect whether the replacement actually behaves like the original. The 3500/65 is particularly sensitive to the distinction between internal and external termination configurations. Bently Nevada explicitly states that external termination blocks cannot be used with an internal-termination I/O module.
Typical Applications
- Turbine bearing temperature: Monitoring radial and thrust bearing metal temperatures as part of a 3500 machinery protection arrangement.
- Compressor temperature monitoring: Measuring process temperatures such as suction and discharge temperature alongside vibration and other machinery variables.
- Steam turbine temperature: Monitoring steam and related process temperatures where temperature alarms are incorporated into the machinery protection strategy.
- Motor and generator applications: Monitoring stator or other critical temperature points using RTDs or compatible isolated-tip thermocouples.
Technical Pitfalls to Avoid
- Do not confuse 3500/65 with 3500/60 or 3500/61.
The 3500/65 provides 16 temperature channels, whereas the 3500/60 and 3500/61 are six-channel temperature monitors. The 3500/61 also provides recorder outputs, which is a different architecture. - Verify the I/O termination arrangement.
01in the 3500/65 ordering structure means internal terminations. The external-termination version uses02and requires the corresponding external termination block and signal cable. These configurations are not interchangeable simply because both accept RTD/TC signals. - Check the RTD wiring before commissioning.
The monitor supports both 3-wire and 4-wire RTDs. For 4-wire RTD applications, Bently Nevada specifies Modification 179952-01 for the appropriate I/O module configuration. - Firmware matters when changing I/O revisions.
Bently Nevada documents a specific firmware procedure when replacing older I/O modules with newer revisions. The I/O module must be removed before upgrading the monitor firmware; otherwise an I/O Module Mismatch and 562 ADC Failure can appear in the system event list. - Check the existing 3500 software environment.
The OEM specifies minimum software/firmware requirements for adding a 3500/65 to an existing rack, including 3500/22 firmware 1.50, 3500/01 software 3.85, 3500/93 firmware 2.02, and System 1 software 5.2 with Service Pack 2 or later. The legacy 3500/02 and 3500/03 software is explicitly listed as unsupported for the 3500/65. - Do not assume the
-R0suffix defines the complete engineering configuration.
Supplier records commonly associate3500/65-01-00-R0with 145988-02 + 172103-01, but the physical monitor label, I/O module revision, modification status, and installed firmware should take precedence during a replacement project.
Related Products
- 145988-02 — The 3500/65 monitor module itself; normally paired with the appropriate RTD/TC I/O module.
- 172103-01 — RTD/isolated-tip TC I/O module with internal terminations, directly associated with the
3500/65-01-00configuration. - 172109-01 — RTD/isolated-tip TC I/O module with external terminations; requires the corresponding external termination architecture.
- 172115-01 — External termination block for the 3500/65 RTD/isolated-tip TC external-termination arrangement.
- 3500/60 — Six-channel RTD/TC temperature monitor without recorder outputs; useful where the channel count and system configuration match.
- 3500/61 — Six-channel temperature monitor with additional 4–20 mA recorder outputs for each channel. It is not a direct functional equivalent to the 16-channel 3500/65.
- 3500/32M — Four-channel relay module used elsewhere in the 3500 system to provide relay outputs from configured machinery alarms.
- 3500/33 — Sixteen-channel relay module for 3500 system alarm/output applications.
- 3500/22M — Transient Data Interface Module used for communication/interface functions within the 3500 rack; it is not a temperature input module.
Procurement Note
For a replacement purchase, specify 3500/65-01-00-R0 together with the physical monitor and I/O module part numbers where possible. Confirm 145988-02, 172103-01, I/O revision, any 179952-01 modification, firmware revision, RTD/TC sensor type, 3-wire versus 4-wire wiring, and the existing 3500 rack software environment.
For an installed protection system, do not approve a substitution solely because the replacement is labeled “3500/65.” The termination architecture and firmware relationship are part of the engineering compatibility check. Bently Nevada’s current documentation specifically warns about I/O-module mismatch and firmware requirements, making those details worth checking before an outage rather than during commissioning.
