BENTLY 136711-01

Description

Product Overview

The BENTLY 136711-01 is a specialized monitoring module within the Bently Nevada 3500 machinery protection system, specifically functioning as a Temperature Monitor. This module is designed to accept inputs from Resistance Temperature Detectors (RTDs), typically 100-ohm Platinum (Pt100) sensors, to monitor critical temperatures on rotating equipment such as bearing babbitt temperatures, lubrication oil temperatures, and motor winding temperatures. Its primary role is to measure the RTD’s resistance, convert it to an accurate temperature reading (in °C or °F), compare this value to user-defined alarm setpoints, and communicate the status and data to the 3500 rack for display and protective action. For comprehensive technical documentation, configuration guides, and wiring diagrams, please refer to the official product resource: BENTLY 136711-01. The BENTLY 136711-01 is a vital component for preventing equipment damage due to overheating, providing both continuous monitoring and reliable temperature-based protection.

Product Parameters and Specifications

• Function: RTD Temperature Monitor Module for 3500 System.
• Input Type: Accepts signals from standard 100-ohm Platinum RTDs (Pt100) in a 2-wire, 3-wire, or 4-wire configuration. 3-wire is most common to compensate for lead wire resistance.
• Measurement: Provides precise temperature measurement by measuring RTD resistance. The module typically includes lead resistance compensation for 3-wire RTDs to ensure accuracy.
• Number of Channels: The specific variant (136711-01) usually indicates a single-channel or potentially a dual-channel RTD monitor. The exact channel count should be verified in the datasheet.
• Alarm Channels: Provides fully configurable Alert and Danger alarm setpoints with adjustable time delays to prevent nuisance trips during slow temperature ramps.
• Outputs:
  • 4-20 mA Analog Output: Proportional to the measured temperature for trending or connection to a DCS/PLC.
  • Relay Outputs: Dedicated relay contacts for each alarm level (Alert and Danger) to trigger external annunciators, fans, or shutdown circuits.
• Configuration: Configured via the 3500 rack’s Frame Interface Module (e.g., 3500/20 or 3500/22) using Bently Nevada’s configuration software. Settings include RTD type (Pt100), wiring (2/3/4 wire), temperature units, alarm setpoints, and alarm delays.
• Diagnostics: Continuously monitors for Sensor Fault conditions such as RTD open circuit, short circuit, or out-of-range resistance.

Advantages and Key Features

The BENTLY 136711-01 offers key advantages for reliable temperature protection. Its primary benefit is providing high-accuracy, dedicated temperature monitoring integrated directly into the machinery protection system, ensuring a fast and coordinated response to overheating conditions. The module’s support for 3-wire RTD configuration with lead resistance compensation is critical for maintaining accuracy over long cable runs typical in plant installations. Its dual-level alarm system with time delays allows for an early warning to operators (Alert) and a definitive shutdown command (Danger) if the condition persists or worsens. Seamless integration within the 3500 system means temperature data can be correlated with vibration and position data from other modules in the same rack, providing a holistic view of machine health. The BENTLY 136711-01 is designed for robustness and diagnostic clarity, helping to distinguish between a genuine over-temperature event and a sensor failure.

Application Cases in Industry

This temperature monitor is ubiquitous on all types of critical rotating equipment. In Turbines (Gas, Steam, Hydro), it monitors main and thrust bearing metal temperatures and lube oil temperatures. On Centrifugal and Reciprocating Compressors, it tracks bearing temperatures and discharge gas temperatures. For Large Motors and Generators, it monitors stator winding temperatures and bearing temperatures. The BENTLY 136711-01 is also standard on Pumps, Fans, Gearboxes, and Process Reactors across industries like oil & gas, power generation, chemicals, and pulp & paper. It is a fundamental element of any API 670-compliant protection system.

Comparison with Competing Products

• vs. DCS/PLC Temperature Input Cards: While a DCS can monitor temperature, the 136711-01 is purpose-built for high-reliability protection within a dedicated safety system. It offers faster, deterministic response, dedicated alarm relays, and is physically and logically separate from the basic process control system, providing an independent layer of safety.
• vs. Standalone Temperature Swangers/Controllers: Simple switches provide only a local trip. The BENTLY 136711-01 integrates the temperature point into a centralized protection system with remote alarming, data logging, and correlation with other machine parameters.
• vs. Other Machinery Monitor RTD Cards (e.g., from EPRO, Vibro-Meter): These offer similar functionality. The 136711-01 is distinguished by its native integration into the industry-standard 3500 platform, its compliance with machinery protection standards, and the global support network of Bently Nevada. The choice is often dictated by the existing monitoring system architecture.

Selection Suggestions and Precautions

• Selection Advice:
  1. RTD Type and Wiring Confirmation: Ensure the RTD sensor is Pt100 and confirm the wiring configuration (2, 3, or 4-wire). The BENTLY 136711-01 module must be configured identically. 3-wire is strongly recommended for accuracy.
  2. Alarm Setpoint Strategy: Base alarm setpoints on manufacturer specifications (e.g., bearing temperature limits) or historical operating data. The Danger setpoint should be below the temperature that could cause immediate damage.
  3. Redundancy for Critical Points: For vital measurements like thrust bearing temperature, consider using dual RTDs wired to separate 136711-01 monitor channels or modules for voting logic.
  4. Sensor Location: RTDs must be installed correctly, with good thermal contact to the measured surface (e.g., embedded in a bearing thermowell). Poor installation leads to slow response and inaccurate readings.
• Important Precautions:
  1. Correct Wiring and Termination: For 3-wire RTDs, ensure the correct leads are connected to the designated terminals on the module’s terminal board. Incorrect wiring will cause significant measurement errors due to uncompensated lead resistance.
  2. Use of Thermowells: In pressurized or hazardous applications, always install the RTD inside a properly rated thermowell. Never directly insert an RTD into a process stream without one.
  3. Sensor Fault Diagnostics: Pay attention to Sensor Fault alarms. A failed RTD (open circuit) will often read as an impossibly high or low temperature. The module’s diagnostics should catch this, but it’s crucial to investigate rather than ignore.
  4. Calibration: While RTDs are stable, the entire loop (RTD, wiring, 136711-01 input) should be periodically verified or calibrated against a known standard, especially for critical protection points.

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