Honeywell 621-0025 RTD Input Module

The Honeywell 621-0025 RTD Input Module is a high-precision temperature input module designed to interface with Resistance Temperature Detectors (RTDs) in industrial control systems. Developed for integration with Honeywell’s TDC 2000, TDC 3000, and PlantScape platforms, this module provides isolated, reliable temperature data acquisition in critical process environments.

With support for multiple RTD types (such as Pt100, Pt1000, and others), the 621-0025 enables accurate, linear temperature measurement across a wide range of applications. This module is essential for monitoring and controlling temperature-sensitive processes in sectors like chemical processing, oil refining, energy generation, pharmaceuticals, and food manufacturing.

Its isolated inputs enhance signal integrity by eliminating noise and electrical interference, contributing to safer and more efficient operations.

Technical Specifications

Applications

The 621-0025 RTD Input Module is purpose-built for a wide range of temperature-sensitive industrial processes. Its robust design and precise measurement capabilities make it suitable for:

• Chemical & Petrochemical Plants

  Accurate process temperature monitoring to ensure reaction control and product quality.

• Oil & Gas Facilities

  Temperature surveillance in pipelines, storage units, and refining operations.

• Power Generation Plants

  Boiler, turbine, and coolant system temperature control.

• Pharmaceutical Industry

  Strict temperature regulation during compound mixing and formulation.

• Food and Beverage Production

  Monitoring and controlling temperature in pasteurization and fermentation processes.

• Water Treatment Plants

  Maintaining appropriate process temperatures for filtration and purification.

Key Advantages

• Multi-Type RTD Support

  Compatible with a wide range of RTDs, including Pt100, Pt1000, and more.

• Flexible Wiring Configurations

  Accepts 2-wire, 3-wire, and 4-wire RTD connections to meet different installation needs.

• High Accuracy & Resolution

  Offers precise temperature readings with 16-bit resolution and minimal drift.

• Electrical Isolation

  Enhanced signal integrity with channel-to-channel and channel-to-ground isolation.

• Onboard Diagnostics

  Integrated features for detecting sensor failures and wiring issues.

• Seamless Integration

  Designed specifically for Honeywell’s TDC and PlantScape platforms, ensuring reliable system compatibility.

• Compact & Durable Design

  Small footprint, industrial-grade build suitable for harsh operating environments.

Frequently Asked Questions (FAQ)

1. What types of RTDs are compatible with the 621-0025 module?

   It supports Pt100, Pt1000, Cu10, Ni100, and other standard industrial RTDs.

2. How many RTD channels does it support?

   The module provides 8 isolated RTD input channels.

3. Can it handle 2-wire and 4-wire RTD configurations?

   Yes, it supports 2-wire, 3-wire, and 4-wire configurations.

4. Does each channel provide electrical isolation?

   Yes, each channel is isolated from the others and from ground.

5. What is the typical resolution of the input readings?

   16-bit resolution is provided for high-precision temperature measurement.

6. Is it hot-swappable?

   No, for safety and system integrity, power down the system before replacement.

7. Is calibration needed after installation?

   Factory-calibrated, but site calibration may be performed for critical applications.

8. What kind of diagnostics are available?

   It includes open-circuit detection and fault alarms.

9. What Honeywell systems is it compatible with?

   Works with TDC 2000, TDC 3000, and PlantScape DCS platforms.

10. How do I mount the module?

    It can be DIN-rail mounted or slotted into the Honeywell backplane system.