Bently Nevada 3500/65 184469-01 Temperature Monitor

Monitor Overview

The Bently Nevada 3500/65 184469-01 temperature monitor provides continuous temperature measurement for 3500 series machinery protection systems. This versatile module accepts RTD and thermocouple inputs for comprehensive thermal monitoring. It converts temperature signals into engineering units for alarm and shutdown logic. Maintenance engineers rely on this monitor for bearing, stator, and process temperature protection.

Input Channel Configuration

The Bently Nevada 3500/65 184469-01 features 6 independent temperature input channels. Each channel accepts either RTD or thermocouple sensor types. The module supports Pt100 RTD and J, K, T thermocouple types. Users can configure each channel individually for sensor compatibility. This flexibility suits mixed sensor installations.

RTD Measurement Specifications

The module measures Pt100 RTDs with 16-bit resolution and ±0.1°C accuracy. It uses 2-wire, 3-wire, or 4-wire RTD connections for system flexibility. The RTD excitation current measures 0.5 milliamperes for minimal self-heating. The measurement range spans -200°C to +850°C for platinum sensors. This capability supports most industrial temperature monitoring requirements.

Thermocouple Measurement Specifications

The Bently Nevada 3500/65 184469-01 measures J, K, and T type thermocouples accurately. It provides ±0.5°C accuracy and 0.1°C resolution for precise readings. Cold junction compensation ensures accurate measurements without external references. The module includes built-in thermocouple linearization for direct engineering units. This feature simplifies configuration and data interpretation.

Output Signaling and Alarm Functions

The module provides 8 programmable alarm relays for alert and danger setpoints. Each channel offers independent trip and alarm levels. The unit delivers 4-20 mA analog outputs for DCS and SCADA integration. It also provides relay contacts for shutdown logic and annunciation. These outputs enable comprehensive thermal protection strategies.

Signal Processing and Filtering

The Bently Nevada 3500/65 184469-01 incorporates digital filtering for noise reduction. Low-pass filters remove high-frequency electrical interference. The module provides averaging for stable temperature readings. It includes open-circuit and short-circuit sensor detection for diagnostics. This processing ensures reliable and accurate temperature data.

Communication and System Integration

The module interfaces through the 3500 rack backplane for system communication. It exchanges data with the controller for alarm management and logic. The monitor supports Modbus communication for external monitoring. Configuration software enables full parameter customization. This integration fits seamlessly into 3500 protection systems.

Physical Dimensions and Installation

The monitor measures 65 millimeters in width, 150 millimeters in height, and 120 millimeters in depth. The unit weighs 0.5 kilograms for straightforward insertion. It plugs directly into any 3500 rack slot. The module requires no additional mounting hardware. This design simplifies field replacement.

Power Consumption and Heat Dissipation

The Bently Nevada 3500/65 184469-01 draws 200 milliamperes from the backplane supply. It dissipates approximately 5.5 watts during typical operation. The aluminum enclosure aids natural convection cooling. This efficient design suits dense rack configurations.

Diagnostic and Status Indication

Front-panel LEDs display power, communication, and channel status clearly. A green OK LED confirms normal module operation. Each channel has dedicated alarm and sensor fault LEDs. The module sends diagnostic codes to the system controller. These indicators enable quick problem identification.

Environmental Specifications

The monitor operates from -20°C to +65°C ambient temperature. It withstands 10% to 95% non-condensing humidity conditions. The unit meets ISA S71.04 environmental standards for industrial use. The conformal-coated PCB resists moisture and contaminants.

Technical Specifications Table

Parameter	Specification
Input Channels	6 independent
RTD Types	Pt100, 2/3/4-wire
RTD Range	-200°C to +850°C
RTD Accuracy	±0.1°C
Thermocouple Types	J, K, T
TC Accuracy	±0.5°C
Resolution	16-bit (0.1°C)
Excitation Current	0.5 mA
Cold Junction Compensation	Built-in
Alarm Relays	8 programmable
Analog Outputs	4-20 mA
Filtering	Digital low-pass
Open/Short Detection	Yes, per channel
Backplane Interface	3500 rack compatible
Communication	Modbus, configuration software
Dimensions (W×H×D)	65 × 150 × 120 mm
Weight	0.5 kg
Power Consumption	200 mA @ backplane voltage
Power Dissipation	5.5 W typical
Indicators	OK, alarm, sensor fault LEDs
Operating Temperature	-20°C to +65°C
Humidity Tolerance	10% – 95% RH non-condensing
Environmental Standard	ISA S71.04
Protection Coating	Conformal-coated PCB
Compatibility	3500 monitoring system