Bently Nevada 3500/60-05-01 136711-01 RTD/TC Temperature Monitor

Product Overview

The 3500/60-05-01 (136711-01) is a high-precision Temperature Monitor module designed for the Bently Nevada 3500 Machinery Protection System. This specific configuration features a non-isolated I/O module with internal barriers and internal terminations, providing a compact and secure interface for critical machinery temperature points. Primarily utilized in power generation, hydrocarbon processing, and large-scale compression, the 3500/60 accepts inputs from up to six Resistance Temperature Detectors (RTDs) or Thermocouples (TCs). By integrating temperature monitoring directly into the machinery protection rack, it allows for seamless correlation between vibration and thermal data. This integration is vital for the early detection of bearing degradation or cooling system failures, significantly reducing the risk of catastrophic asset damage and unscheduled downtime in heavy industrial environments.

Suffix Breakdown

The model nomenclature 3500/60-05-01 designates a specific hardware build optimized for hazardous area safety and connectivity:

• 3500/60: Series designation for the RTD/TC Temperature Monitor module.

• A: 05 (I/O Module Type): RTD/TC Non-isolated I/O Module equipped with Internal Barriers. This option is designed for applications where field sensors are located in hazardous areas, utilizing internal safety barriers to limit energy levels.

• B: 01 (Agency Approval): CSA/NRTL/C (Class 1, Div 2) certified for North American safety standards in hazardous locations.

• 136711-01: The specific rear I/O component part number for internal termination and internal barrier functionality.

Technical Specifications

Field Inquiries and Support FAQ

Can I mix RTD and Thermocouple types on the same module?

The 3500/60 allows for individual channel configuration via software. However, the hardware I/O type (Internal Barrier vs. Isolated) must be consistent for the module. Platinum 100 Ohm (0.00385 alpha) is recommended as the industrial standard for accuracy.

What happens if a field wire shorts or breaks?

The module features an OK LED and self-diagnostics. If a transducer signal goes out of range or a wire is severed, the OK LED will extinguish, and the Tx/Rx LED will indicate status, preventing false trips while alerting operators.

Why is the full-scale range reduced for Type E Thermocouples above 35 deg C?

In isolated I/O configurations at elevated ambient temperatures, thermal drift can affect the low-end linearity. For the non-isolated 05 option, accuracy remains consistent within the specified 0 to 65 deg C operating window.

Installation Guidelines and Engineering Advice

• Hazardous Area Integrity: When utilizing the 136711-01 I/O with internal barriers, ensure that field wiring practices strictly adhere to the control drawings for Class 1, Div 2. The internal barriers are designed to limit energy, but improper grounding or bypassing of these terminals can compromise the safety rating of the entire rack.

• Internal Termination Routing: Use high-quality shielded twisted pair cabling for TC and RTD leads. Since this is an Internal Termination (IT) module, ensure that cable shields are grounded at the 3500 rack ground stud only. Avoid multi-point grounding to prevent ground loops that introduce noise into high-impedance temperature circuits.

• Cold Junction Compensation (CJC): For Thermocouple applications, the CJC sensor is located on the I/O module terminals. To ensure maximum accuracy, avoid installing heat-generating equipment (such as large power supplies) directly below the rear of the 3500 rack, as localized heating of the I/O module can introduce measurement offsets.

• Slot Requirements: The 3500/60 monitor requires one full-height front slot, and the 136711-01 I/O requires the corresponding full-height rear slot. Ensure the module is fully seated and the thumb screws are hand-tightened to maintain backplane communication integrity.