Description
The Bently Nevada 136711-01 is a 6-channel Temperature Monitor I/O Module designed for the 3500 Machinery Protection System. It features internal intrinsic safety (IS) barriers and internal terminations, allowing direct connection to Resistance Temperature Detectors (RTDs) and Thermocouples (TCs) located in hazardous areas without requiring external safety barriers. The module conditions these high-precision temperature inputs and transmits the data to the 3500/60 monitor main processing unit to compare against user-programmed alarm setpoints.
Commercial Availability & Logistics
| Commercial Attribute | Status and Conditions |
| Product Condition | New Original (Factory Sealed Surplus) or Refurbished (Fully Tested) |
| Warranty Period | 12-month comprehensive warranty |
| Availability | Stock available; subject to prior sale |
| Standard Lead Time | Ships within 1–2 business days for stock items |
| Pricing Note | Price subject to market conditions; contact us for a firm quote |
Technical Specifications
The 136711-01 serves as the backplane interface module (I/O brick) installed in the rear of the 3500 chassis, mating directly with the corresponding 3500/60 front monitor card.
Input & Channel Capacities
- Channels: 6 differential channels supporting RTD, TC, or a mixed configuration
- RTD Support: 3-wire and 4-wire configurations (Platinum Pt100, Pt1000, Copper Cu10, Nickel Ni120)
- Thermocouple Support: Type E, J, K, T, and R/S/B types
- Input Impedance: 10 MΩ for each lead input
- Isolation: Non-isolated channel-to-channel baseline; protection provided via internal intrinsic safety barriers
Electrical & Physical Specs
- Power Consumption: 7 W nominal (supplied via 3500 rack backplane)
- Termination Type: Internal screw-terminal blocks
- Hazardous Area Protection: Intragalvanic internal barrier assembly certified for Zone 0/1, Class I Division 1 deployment
- Dimensions (H × W × D): 241 mm × 24.4 mm × 103 mm
- Weight: 0.46 kg
Environmental Limits
- Operating Temperature: −30 to +65 °C (−22 to +149 °F)
- Storage Temperature: −40 to +85 °C (−40 to +185 °F)
- Humidity: 95% relative humidity, non-condensing
Field Deployment & Integration Context
In 2 AM troubleshooting scenarios involving the 3500/60 system, the 136711-01 with internal barriers is often chosen to reduce cabinet footprint. However, there are explicit field constraints that engineering teams must note:
Sensor and Wiring Engineering Constraints
- Ground Loop Vulnerabilities: Because this standard non-isolated version shares a common ground across channels, any insulation breakdown or grounding on a thermocouple sheath will inject noise across the remaining channels. If your process suffers from high stray ground currents, you must specify the isolated variant (-03 or -04 option codes) rather than the 136711-01.
- Triple Modular Redundant (TMR) Rules: When using the 3500/60 system in a safety instrumented system (SIS) requiring TMR configuration, temperature monitors must be installed in adjacent groups of three. The internal hardware carries out a 2-out-of-3 voting logic at the monitor level.
- Configuration Dependency: Channel assignment (switching a channel from RTD to TC) requires the 3500 Rack Configuration Software. The hardware will throw a configuration mismatch error code if the software parameters do not match the physical terminal jumper arrangement on the 136711-01.
Frequently Asked Questions
Can I swap the 136711-01 I/O module while the 3500 rack is powered?
No. While front monitor modules can be hot-swapped under strict procedures, removing or inserting the rear I/O module while the backplane is energized can cause transient voltage spikes, potentially damaging the internal intrinsic safety components or interrupting adjacent protection slots. Always de-energize the rack or bypass the respective trip relays before swapping rear I/O bricks.
What is the distinction between the 136711-01 and the 133811-01?
The 136711-01 includes built-in internal safety barriers for hazardous areas. The 133811-01 is the standard internal termination I/O block intended for safe-area applications or installations utilizing external zener/galvanic barriers. They are not drop-in equivalents due to differing field terminal safety classifications.
Why is the module reading upscale/downscale faults after replacement?
Verify that the sensor burn-out configuration matches the field hardware. A loose terminal connection or an open circuit on a thermocouple will force the 3500/60 monitor to read either maximum high or minimum low values depending on whether “Upscale” or “Downscale” fault drive was programmed in the 3500 Configuration Software.
Technical Note: Ensure that the intrinsic safety ground bus bar on the 3500 chassis is properly bonded to earth. The internal safety barriers within the 136711-01 rely entirely on a low-impedance path to the system ground to divert fault energy away from the hazardous area.
