3500/65 172109-01 RTD/ Isolated TC I/O Module

Core Analysis of 3500/65 172109-01 RTD/Isolated TC I/O Module
I. Product Positioning and Function
This module is an input/output component of the 16-channel temperature monitoring module (3500/65) in the Bentley Nevada 3500 series mechanical condition monitoring system, specifically designed for high-precision temperature signal acquisition. It supports the following two input types:
RTD (Resistance Temperature Detector)
Supports 3-wire/4-wire platinum RTD (α=0.00385, industrial standard), with a measurement range covering -200°C to +850°C.
Compatible with nickel RTD (-80°C to +260°C) and copper RTD (-100°C to +260°C), but platinum RTD is the recommended option.
Isolated TC (Isolated Thermocouple)
Supports thermocouple types such as Type E, J, K, T, etc., with a measurement range from -160°C to +1370°C (depending on type).
Isolation design: Provides 250Vdc isolation between channels, effectively preventing external electromagnetic interference and ensuring signal stability.
Core functions:
Receive signals from front-end sensors and perform signal conditioning (such as cold junction compensation and linearization processing).
Compare the processed temperature values with the alarm thresholds (Alert/Danger) set by the user through the 3500 Rack Configuration Software.
Support triple modular redundancy (TMR) configuration and avoid single-point failures through a dual voting mechanism to enhance system reliability.

Technical Specifications and Performance
Parameter Specification
Number of Input Channels 16 channels (can be mixed configured with RTD/TC)
Input Impedance >1MΩ per lead input (TC mode)
RTD Excitation Current 913±7μA @25°C (1 power supply for each 3-wire RTD channel, 2 power supplies for each 4-wire RTD channel)
Resolution 1°C or 1°F
Accuracy ±3°C @25°C (standard rack/external terminal rack)
Cold Junction Compensation Accuracy (TC) ±2°C @25°C
Alarm Setting 0% to 100% of full scale adjustable (subject to sensor range limitations)
Redundancy Support TMR configuration requires 3 adjacent modules, using dual voting mechanism

Application scenarios and advantages
Temperature monitoring of critical equipment
Suitable for scenarios such as metal temperature of turbine radial/thrust bearings, suction and exhaust temperatures of compressors, and stator temperatures of motors as required by API 670 standards.
Advantages: High precision (±3°C), multi-channel (16 channels) design, reducing the number of rack slots occupied by equipment.
Adaptability to harsh environments
Isolated TC input can resist electromagnetic interference, suitable for strong interference scenarios such as high-voltage motors and high-temperature furnaces.
Advantages: 250Vdc channel isolation voltage, ensuring signal integrity.
Redundancy system requirements
In fields with extremely high reliability requirements such as nuclear power and chemical industry, TMR configuration can prevent monitoring failure caused by single-point faults.
Advantages: Dual voting mechanism ensures the accuracy of alarm triggering, reducing the risk of false alarms and missed alarms.

Description

The 3500/65 monitor provides 16 channels of temperature monitoring and accepts both resistance temperature detector (RTD) and isolated tip thermocouple (TC) temperature inputs.

The monitor conditions these inputs and compares them against user-programmable alarm setpoints.

The monitor is programmed using the 3500 Rack Configuration Software. You can configure the 16-Channel Temperature Monitor to accept isolated tip thermocouples, 3-wire RTD, 4-wire RTD, or a combination of TC and RTD inputs.

In Triple Modular Redundant (TMR) configurations, you must install temperature monitors in groups of 3 adjacent monitors. In this configuration the monitor uses 2 types of voting to ensure accurate operation and to avoid single-point failures.

Ordering Considerations

If you add the 3500/65 to an existing 3500 System your system will require the following or later firmware and software versions:

3500/22 Module Firmware Revision 1.50

3500/01 Software Version 3.85

3500/02 Software Not supported

3500/03 Software Not supported

3500/93 Module Firmware Revision 2.02

System 1 Software Revision 5.2 with Service Pack 2 or later

Spares

172931 3500/65 User Guide

145988-02 3500/65 Monitor

172103-01 3500/65 RTD/Isolated Tip TC I/O Module,

Internal Terminations

173005 Connector Header, Internal Termination,

20-position, Black

172109-01 3500/65 RTD/ Isolated Tip TC I/O Module,

External Terminations

172115-01 RTD/Isolated Tip TC External Termination

Block (Euro Style Connectors)

Specifications