Description

Product Description

The 3500/60 Temperature Monitoring Module (133835-01) is a rack-based 16-channel acquisition unit designed for continuous thermal condition supervision in rotating and stationary machinery systems. It is part of the Bently Nevada 3500 platform and provides high-density temperature acquisition with integrated diagnostics, alarm handling, and system communication.

The module is engineered for long-term deployment in machinery protection environments where thermal stability is critical to equipment reliability.

Input Architecture

This module supports mixed sensor input across 16 independent channels:

• RTD sensors:

• Pt100 (100 Ω platinum)

• Ni120 (nickel-based elements)

• 2-wire, 3-wire, and 4-wire configurations supported

• Measurement range: approximately –200 °C to +850 °C (sensor dependent)

• Thermocouples:

• Types supported: J, K, E, T, R, S, B, N

• Extended range capability up to ~1700 °C depending on thermocouple type

• Internal automatic cold-junction compensation

• Input characteristics:

• RTD input impedance > 1 MΩ

• Thermocouple input impedance > 10 MΩ

Measurement and Diagnostic Functions

Each channel operates independently and provides:

• Continuous temperature acquisition

• Dual alarm thresholds per channel (warning and critical levels)

• Open-circuit detection for broken sensor wiring

• Short-circuit and wiring fault identification

• Channel-level configuration flexibility

• Data trending and historical logging through rack communication

System Integration and Outputs

• 16-channel data transmitted through 3500 rack backplane

• Interface compatibility with TDI modules and System Display units

• Relay-based alarm outputs managed through external 3500/32 or 3500/33 modules

• Front-panel indicators:

• System status (OK)

• Communication activity (TX/RX)

• Bypass condition indication

No direct analog buffering is provided, as temperature data is handled digitally within the rack architecture.

Accuracy and Performance

• RTD measurement accuracy: ±0.1% of reading

• Thermocouple accuracy: typically ±1 °C to ±2 °C depending on type

• Measurement resolution: 0.1 °C

• Channel update interval: approximately 100 ms per channel

These characteristics support stable long-term monitoring in thermally dynamic machinery environments.

Electrical and Environmental Data

• Typical power consumption: 7.0 W

• Operating temperature range: –30 °C to +65 °C

• Relative humidity tolerance: up to 95% non-condensing

• Compliance:

• CE certified

• CSA certified

• API 670 compliant system integration capability

Application Areas

• Turbine casing and bearing temperature monitoring

• Compressor thermal supervision

• Motor and generator winding temperature tracking

• Gearbox and lubrication system thermal monitoring

• Pump system condition tracking

FAQ

Q1: Does this module support both RTD and thermocouples simultaneously?
Yes, each of the 16 channels can be configured individually for RTD or thermocouple input.

Q2: Is signal conditioning required externally?
No, cold-junction compensation and signal conditioning are integrated into the module.

Q3: How are alarms handled?
Alarm thresholds are configured per channel and communicated through the 3500 rack system to relay modules.

Specifications

• Brand: Bently Nevada

Advantages

• High reliability in industrial environments
• Supports continuous operation
• Compatible with major PLC/DCS systems