ABB D674A906U01 FET300 HART Plug-In Module

Key Technical Specifications

ABB’s current product data describes D674A906U01 as “Cartridge U-high HART / Std. FET 300”, with a 0.25 kg net weight, 0.25 kg gross weight, German origin, and a minimum order quantity of one piece.

The ABB spare-parts list specifically distinguishes this from D674A905U01, which is the 24 V version. D674A906U01 is the 230 V version.

Product Introduction

The ABB D674A906U01 is a 230 V HART-standard plug-in transmitter module for ABB FET300 electromagnetic flowmeter equipment. ABB lists it under the FET301 transmitter plug-in module section and identifies it as a recommended spare part.

For replacement work, the important distinction is the supply version. D674A905U01 is the 24 V variant, while D674A906U01 is the 230 V variant. ABB also lists D674A906U01 as the replacement for earlier D674A881U01 and D674A900U01 versions.

D674A906U01

D674A906U01

Installation & Configuration Guide

Stage 1: Pre-Installation Preparation — 5–10 minutes

⚠️ Safety First: This is a 230 V module. Notify operations, place the flow measurement loop in a safe state, isolate the transmitter power supply under the site’s lockout/tagout procedure, and verify absence of voltage before opening the transmitter.

Tools Required

• ESD wrist strap
• Insulated screwdriver appropriate for the transmitter hardware
• Digital multimeter
• Wire labels
• Smartphone for configuration photographs
• ABB documentation for the installed FET300/FET301 assembly

Data Backup

1. Record the complete transmitter model and serial number.
2. Photograph the existing module before removal.
3. Record wiring and terminal positions.
4. Photograph configuration switches or links if present.
5. Record the transmitter’s existing HART configuration.
6. Record output scaling, flow range, units, damping, and alarm settings.
7. Record any customer-specific transmitter configuration before replacement.

⚠️ Do not confuse the 24 V and 230 V versions. ABB identifies D674A905U01 as the 24 V HART module and as the 230 V HART module.

Stage 2: Removing the Old Module — 5 minutes

1. Confirm the transmitter is de-energized with a multimeter.
2. Remove the transmitter cover according to the FET300/FET301 installation procedure.
3. Photograph the module, connectors, and wiring.
4. Label any removable conductors before disconnecting them.
5. Disconnect the module carefully; do not pull on the cable.
6. Release the plug-in module from its retaining mechanism.
7. Remove the old module straight and avoid damaging connector contacts.
8. Inspect the mating connector for oxidation, contamination, or mechanical damage.

⚠️ Keep the original module until commissioning is complete. It is useful for confirming connector orientation and configuration if the replacement does not initialize correctly.

Stage 3: Installing the New Module — 5–10 minutes

1. Verify the replacement marking: .
2. Confirm that the replacement is the 230 V HART standard version.
3. Compare the connector arrangement with the removed module.
4. Check the mating connector for contamination or bent contacts.
5. Use ESD precautions when handling the electronics.
6. Insert the module in the correct orientation.
7. Seat the module completely.
8. Reconnect wiring exactly according to the recorded terminal arrangement.
9. Check that no conductor is loose or trapped under the cover.

Self-Checklist

• verified
• 230 V version confirmed
• HART standard version confirmed
• Connector orientation correct
• Wiring returned to original terminals
• No bent or contaminated contacts
• Module fully seated
• Transmitter cover ready for secure reinstallation

Stage 4: Power-On & Testing — 10–15 minutes

1. Perform a final wiring and polarity inspection before energizing.
2. Restore power according to the approved commissioning procedure.
3. Observe the transmitter startup sequence.
4. Confirm the display and transmitter status.
5. Connect the HART communicator or approved engineering interface.
6. Verify that the transmitter recognizes the installed HART functionality.
7. Check the configured measurement range.
8. Verify the HART communication address and communication parameters.
9. Confirm analog output scaling where applicable.
10. Check the displayed flow value against the process condition.
11. Verify totalizer and diagnostic information.
12. Return the measurement loop to service after the signal has remained stable.

⚠️ Troubleshooting Note: If the transmitter powers up but HART communication fails, first verify the HART loop wiring, load resistance, communicator connection, transmitter configuration, and module seating. Do not immediately assume the cartridge is defective.

Frequently Asked Questions (FAQ)

1. What exactly is ABB ?

It is a 230 V HART-standard transmitter plug-in module/cartridge for ABB FET300 electromagnetic flowmeter equipment. ABB’s spare-parts documentation places it under the FET301 transmitter plug-in module and marks it as a recommended spare.

2. Is a complete flowmeter?

No. This distinction matters. is a plug-in transmitter module, not a complete electromagnetic flowmeter system consisting of a sensor and transmitter. ABB describes it as a cartridge/module for the FET300 family.

3. What is the difference between D674A905U01 and ?

The primary documented difference is the supply version:

• D674A905U01: 24 V HART standard module
• 230 V HART standard module

Do not substitute them based only on physical appearance. Verify the transmitter’s required supply version before ordering.

4. What older parts does replace?

ABB’s spare-parts documentation lists D674A881U01 and D674A900U01 as earlier 230 V HART-standard modules replaced by .

5. Does support HART?

Yes. ABB explicitly identifies the part as a 230 V plug-in module, HART standard and gives its catalog description as “Cartridge U-high HART / Std. FET 300.”

6. Is still an orderable ABB spare?

ABB’s product data identifies as a product with minimum order quantity of one piece, and ABB’s spare-parts list marks it as a recommended spare. That is stronger evidence than generic reseller descriptions, although actual regional stock and lead time still need to be confirmed at the time of purchase.

7. What should I verify before buying a replacement?

For this part, I would verify four things first: the exact part number , the 230 V supply version, the HART standard configuration, and the installed transmitter/ hardware revision. If the old module is marked D674A881U01 or D674A900U01, ABB’s spare-parts documentation indicates as the replacement.