Honeywell FTA-T-21 | Field Termination Assembly
Honeywell FTA-T-21 | Field Termination Assembly - Image 2
Honeywell FTA-T-21 | Field Termination Assembly - Image 3
Honeywell FTA-T-21 | Field Termination Assembly - Image 4

Honeywell FTA-T-21 | Field Termination Assembly

  • Model: FTA-T-21
  • Brand: Honeywell
  • Series: C300 / Experion PKS
  • Core Function: Field Termination Assembly for temperature sensors
  • Type: I/O Field Base / Signal Conditioner
  • Key Specs: Supports Thermocouple/mV/RTD, HART Protocol, IP54 Rating
Category: SKU: FTA-T-21 HONEYWELL

Description

Key Technical Specifications

Parameter Specification
Input Signal Thermocouple, RTD (2/3/4 wire), mV, Ohm
Communication HART Protocol (Passthrough)
Output Signal 4-20 mA (Conditioned)
Accuracy ±0.15°C (Pt100 RTD)
Supply Voltage 12.0 – 42.4 VDC
Protection IP54 (Dust/Splash resistant)
Mounting DIN Rail or Surface Mount
Environment Hazardous locations (Class I, Div 2)
Compatibility Honeywell C300 Controller (via I/O Link)
Wire Size 12-22 AWG (Spring clamp options available)

 

Product Introduction

The Honeywell FTA-T-21 is a Field Termination Assembly (FTA) designed to interface temperature sensors with the Honeywell C300 control system. It acts as the physical bridge between field devices—such as thermocouples and RTDs—and the automation controller. The module conditions the raw sensor signals into a standardized format for processing, ensuring accurate temperature monitoring in industrial environments.This unit is engineered for flexibility, supporting 2, 3, or 4-wire RTDs, various thermocouple types, and resistance or millivolt inputs. It features HART protocol compatibility, allowing for digital communication with smart field devices for remote configuration and diagnostics. With an IP54 rating and rugged construction, the FTA-T-21 is suitable for installation in harsh areas, including refineries and chemical plants, where resistance to dust and moisture is critical.

Installation & Configuration Guide

Preparation (10 min)

  1. Safety: Lock out and tag out the 24VDC power supply.
  2. Verify the sensor type (e.g., Type K Thermocouple, Pt100 RTD) matches the module configuration.
  3. Ensure the DIN rail or mounting surface is clean and grounded.

Removal (5–10 min)

  1. Disconnect the field wiring from the terminal block.
  2. If mounted on a DIN rail, unclip the locking mechanism.
  3. Slide the unit off the rail.

Installation (10 min)

  1. Mount the FTA-T-21 onto the DIN rail or secure it to the panel surface.
  2. Connect the sensor wires to the appropriate terminals (check polarity for TCs).
  3. Connect the 24VDC power supply and the I/O Link cable to the controller interface.
  4. Note: If using HART, ensure the loop resistance is sufficient (min 250 ohms) for communication.

Power-On & Test (10 min)

  1. Restore power to the unit.
  2. Monitor the status LEDs; a solid green typically indicates valid communication.
  3. Use a HART communicator or the control system software to verify the sensor reading matches the actual temperature.

 

Troubleshooting Quick Reference

Symptom Probable Cause Corrective Action
High/Max Reading Sensor open circuit or disconnected. Check sensor wiring continuity; verify terminal tightness.
Low/Min Reading Sensor short circuit. Inspect wiring for shorts to ground or between wires.
Unstable Reading Electrical noise or grounding loop. Ensure shield is grounded at one end only; check for nearby VFDs.
HART Comm Fail Loop resistance too low. Add a 250-ohm resistor in series if the power supply impedance is too low.

 

Dimensions, Mounting & Wiring Notes

  • Dimensions: Compact form factor designed for high-density DIN rail mounting.
  • Mounting: Standard 35mm DIN rail or direct surface mount (using optional kit).
  • Wiring: Accepts 12-22 AWG wire. Spring clamp options are available for vibration-prone areas.
  • Note: The unit can be installed in a connection head directly on the sensor (head-mounted) or remotely in a junction box.
FTA-T-21 HONEYWELL

FTA-T-21 HONEYWELL

FAQ

What is the main function of the FTA-T-21?
It serves as a Field Termination Assembly that connects temperature sensors (RTDs, Thermocouples) to the Honeywell control system, converting their signals for the controller.Does it support HART communication?
Yes, the FTA-T-21 supports HART protocol, allowing you to configure smart transmitters and read diagnostic data remotely.Can I mount this directly on a sensor?
Yes, it is designed to fit inside standard sensor connection heads (integral mount) or can be mounted remotely on a DIN rail.What power supply does it need?
It operates on a standard industrial 12.0 to 42.4 VDC supply, typically provided by the C300 controller system or a dedicated power supply.Is it suitable for hazardous areas?
Yes, it is rated for use in hazardous locations (Class I, Division 2) and has an IP54 rating for protection against dust and water spray.

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