Product Overview

The 133811-02 is a specialized temperature processing module designed for the Bently Nevada 3500 Series Machinery Protection System. This 6-channel unit serves as a critical interface for monitoring thermal conditions in high-value rotating assets. By accepting both Resistance Temperature Detector (RTD) and Thermocouple (TC) inputs, the module translates raw thermal signals into actionable data for the monitoring rack. Its primary function is to continuously track temperatures in bearing housings, windings, and lubrication systems, providing essential protection against overheating through high-accuracy alarm and trip triggering.

Hardware Parameters and Engineering Specs

• Total Monitoring Channels: 6 Independent Channels

• Transducer Compatibility: RTD (100 Ω Platinum, 10 Ω Copper, 120 Ω Nickel) and Thermocouples (Types E, J, K, T, C, R, S, B)

• System Series: 3500/60 or 3500/61 Series

• Module Mass: 0.82 kg (Approx. 1.8 lbs)

• Form Factor: 241.3 mm x 24.4 mm x 103.1 mm

• Measurement Precision: ±0.25% of full scale

• Signal Resolution: 0.1°C

• Circuit Protection: Integrated overvoltage, reverse polarity, and short-circuit shielding

• Internal Self-Test: Continuous hardware and transducer status diagnostics

Industrial Protection Deployments

The 133811-02 is deployed in aggressive industrial environments where thermal excursions indicate impending mechanical failure. Typical use cases include:

• Electric Motor Protection: Monitoring stator winding and bearing temperatures to prevent insulation breakdown and catastrophic seizure.

• Gas and Steam Turbines: Tracking exhaust gas temperatures (EGT) and bearing metal temperatures for high-speed aero-derivative or industrial units.

• Reciprocating Compressors: Measuring cylinder head and discharge temperatures to ensure optimal gas compression performance.

• Gearbox Monitoring: Sensing oil sump and high-speed shaft bearing temperatures in power transmission systems for oil and gas operations.

FAQ

Q: Can a single 133811-02 module monitor both RTDs and Thermocouples at the same time?

A: Yes, each of the six channels is independently configurable via the 3500 Rack Configuration Software, allowing for a mix of different sensor types on one module.

Q: What happens if a temperature sensor fails or a wire is disconnected?

A: The module includes a "Not OK" status indicator for each channel. If a transducer failure is detected, the system can be configured to suppress alarms to prevent a false machinery trip.

Q: Is the 133811-02 compatible with 3-wire and 4-wire RTD configurations?

A: This module typically supports standard industrial 3-wire RTD configurations to compensate for lead wire resistance, ensuring high measurement accuracy over long cable distances.

Q: Does this module provide a 4-20mA recorder output for external displays?

A: This specific part number is the main processor module. Analog outputs are typically provided by the corresponding I/O module located at the rear of the 3500 rack.

Q: Is there a difference between the 133811-01 and the 133811-02?

A: The 133811-02 is the current hardware revision. It provides enhanced diagnostic capabilities and broader sensor support compared to earlier legacy versions of the temperature monitor.