Description
Note: Many products are not yet listed. Please contact us for more product information. Our supply channels are constantly expanding, and we currently have 20 stable shared supply channels. Please confirm the model, product, price, and all other necessary information with customer service before placing an order. We offer new, refurbished, and used products, and prices are adjusted according to the year of the item you require.
Product Introduction
When a smart HART pressure transmitter loses its digital communication link mid-run, the root cause almost always traces back to a failed signal conditioning cartridge that can no longer process HART modulation signals.
This compact OEM spare part is purpose-built for ABB field instrument maintenance. It integrates the HART protocol modem and 300V rated power FET protection circuit into a single pluggable cartridge, eliminating the need to replace the entire transmitter body when the signal conditioning stage fails. It is stocked at ABB’s Göttingen, Germany warehouse for fast global delivery.
D674A906U01
D674A906U01
D674A906U01
D674A906U01
Key Technical Specifications
| Parameter | Value |
|---|---|
| Product Description | Cartridge U-high HART / Std. FET 300 |
| Rated FET Voltage | 300 V |
| Protocol Support | Native HART field communication protocol |
| Gross Weight | 0.25 kg |
| Net Weight | 0.25 kg |
| Country of Origin | Germany |
| Customs Tariff Number | 85437090 |
| Minimum Order Quantity | 1 piece |
| Mounting Form | Pluggable field instrument internal cartridge |
| Part Type | Genuine OEM spare part |
Field Application & Technical Pitfalls
This part runs three non-negotiable production-critical roles.
First, it acts as the direct replacement signal cartridge for refinery HART pressure transmitters, restoring full digital communication without removing the transmitter from the process line.
Second, it delivers 300V overvoltage protection for chemical plant temperature transmitters, blocking transient surge damage that would otherwise destroy the transmitter’s main PCB.
Third, it serves as the HART modem replacement unit for power plant boiler flow transmitters, enabling full remote configuration and diagnostic access via the HART protocol.
⚠️ Cartridge Orientation Mismatch Risk: This cartridge has a keyed 6-pin connector. If you force it into the socket backwards, you will bend the pins and short the HART modem circuit instantly.
⚠️ ESD Damage on FET Gate Pin: The 300V FET gate pin has no on-board ESD protection. Touch the exposed pin with a non-grounded hand, and you’ll blow the FET before you seat the cartridge fully.
⚠️ Transmitter Model Compatibility Gap: This cartridge only works with ABB field instruments that use the U-high HART 300V cartridge form factor. It will not fit older 200V rated transmitter housings.
I watched a senior instrument tech skip the ESD wrist strap last summer. He swapped this cartridge into a refinery HART pressure transmitter, touched the FET gate pin with his bare hand, and the FET failed 2 days later. The transmitter lost all HART communication, and the plant had to run that control loop in analog-only mode for 3 days while they sourced a replacement cartridge. That 10-second ESD protection oversight forced the operations team to send a technician out to the field twice a shift to manually verify the transmitter readings.
Quality Control (QC) SOP & Transparency
- Inbound Verification: Cross-check the OEM serial number against ABB’s official spare part revision database, run anti-counterfeit validation on the cartridge’s laser-etched serial label, and confirm no prior rework traces on the FET solder joints.
- Live Rig Testing: Plug the cartridge into a certified ABB HART transmitter test rig, connect a HART modem, and verify full stable digital communication across 2 hours of continuous operation.
- Parameter Testing: Perform 350V DC 60-second overvoltage withstand test on the FET, confirm HART signal modulation accuracy meets official ABB specifications, and log all communication stability data.
- Final QA & Packaging: Seal the fully tested cartridge in a static-shielding anti-static bag, apply a unique QC passed serial label, and pack it in ESD-dissipative foam with a printed hard copy of the full HART communication test report.
Frequently Asked Questions
- Can I hot-swap this cartridge while the field transmitter is powered on? No. The transmitter must be fully de-energized before you remove the housing cover. Pulling the cartridge live will short the 4-20mA loop and trigger a false DCS fault alarm.
- What exact ABB field instruments does this part work with? It is fully compatible with ABB field transmitters that use the U-high HART / Std. FET 300 cartridge form factor. It will not fit older 200V rated transmitter models.
- How long is the standard warranty for this new surplus unit? It carries a full 12-month functional warranty. If it fails within that window under specified operating conditions, we cover all return shipping and bench replacement costs.
- How do I tell a genuine OEM unit apart from a refurbished clone? Genuine units have the ABB hologram sticker on the cartridge housing, and the 300V FET has an ABB part number laser-etched on the top. Refurbished clones usually skip the official hologram and use generic unmarked FETs that fail after 6 months of operation.
- Will this D674A906U01 directly replace an older 200V rated HART cartridge? No. The older 200V variant has a different pinout and lower voltage rating. You will need to confirm your transmitter’s cartridge form factor before swapping.
- What’s the maximum safe continuous operating temperature at full 300V FET load? It will hold stable HART communication up to 85°C, though your mileage may vary if the transmitter housing temperature spikes above 100°C in direct summer sunlight.
