Product Core Brief
- Model: D674A906U01 (Catalog Description: Cartridge U-high HART / Std. FET 300)
- Brand: ABB
- Series: FET300 Electromagnetic Flowmeter Spare Communication Cartridges
- Core Function: Embeds native HART protocol stack inside FET300 transmitters for two-way digital field instrument communication.
- Product Type: Miniature plug-in HART communication cartridge spare part
- Key Specs: 300 bps HART baud rate | IP67 sealed construction | 0.25 kg gross shipping weight | Condition: New Original (New Surplus)
Product Introduction
ABB delivers integrated HART digital communication exclusively for ABB FET300 electromagnetic flow transmitters, enabling remote calibration, diagnostic polling, and flow parameter adjustment without local panel access. It draws low parasitic power from the 4–20 mA analog loop with no separate auxiliary supply wiring required.This unit differs from external HART modems by its compact cartridge form factor that inserts directly into the transmitter electronics cavity; its wide -40 °C to +85 °C operating window eliminates the need for heater hardware in outdoor pipeline installations, though your mileage may vary with uninsulated cryogenic pipe racks.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Full Catalog Designation | Cartridge U-high HART / Std. FET 300, Part |
| Core Communication Protocol | HART Revision 7, fixed 300 bps half-duplex signaling |
| Physical Cartridge Dimensions | 37 mm W × 26 mm H × 25 mm D |
| Net Unit Weight | 20 g; gross shipping weight 0.25 kg |
| Power Source | Parasitic power from 4–20 mA analog measurement loop |
| Maximum Loop Current Draw | 1.2 mA HART digital overhead load |
| Environmental Enclosure Rating | IP67 dust and moisture sealed cartridge housing |
| Operating Ambient Temperature | -40 °C to +85 °C continuous operation |
| Storage Temperature Range | -40 °C to +125 °C, 5–95 % RH non-condensing |
| Galvanic Isolation Rating | 500 V DC separation between HART digital circuit and analog flow signal traces |
| Supported Transmitter Hardware | ABB FET300 electromagnetic flowmeter transmitters only |
| PCB Coating Grade | ISA-S71.04 G3 anti-corrosion conformal coating |
| Country of Manufacture | Germany |
| Compliance Certifications | CE EMC, RoHS 2 compliant, ATEX II 3G Zone 2 rated |
Quality Control Process (Engineer’s Perspective)
- Incoming Verification: Cross-reference serial numbers and part code against ABB flow measurement spare databases; inspect cartridge edge contact pins for oxidation and plastic housing for microcracks. Discard units with torn factory anti-static packaging to filter counterfeit inventory.
- Live Functional Test: Insert the cartridge into a bench flow transmitter paired with HART master communicator. Run continuous 24-hour cyclic digital polling, log loop current draw every 15 minutes, and simulate pipe temperature swing transients to validate stable HART signal retention.
- Electrical Parameter Test: Use a 500 V Megger to measure isolation resistance between HART logic traces and analog flow signal contacts; pass threshold set at 10 MΩ minimum. Verify parasitic loop current draw with a Fluke 115 handheld multimeter.
- Firmware Verification: Read and record onboard HART stack firmware revision via ABB FieldCare configuration software. Capture photos of cartridge insertion orientation marks for field service technician reference.
- Final QC & Packaging: Fit clear plastic protective sleeve over the cartridge contact edge. Seal the spare inside foam-lined anti-static packaging, attach a dated QC Pass label before placement in factory shipping cartons.
Replacement Pitfall Guide
❗Firmware Mismatch: Older HART firmware pre-v1.4 lacks extended flow diagnostic register mapping. Installing the cartridge on legacy firmware blocks remote pipe lining wear monitoring and triggers intermittent HART COMM FAULT alarms during high-flow fluid transients. Flash matching cartridge firmware before insertion into the transmitter cavity.❗DIP Switch / Jumper Misconfiguration: Factory default internal cartridge jumpers set HART polling address to 0 for single-instrument loops. Miniature link blocks must be repositioned for multi-drop HART networks; incorrect placement creates duplicate device address collisions that break full plant fieldbus segments.❗Terminal / Cable Incompatibility: Unshielded field wiring picks up EMI near high-power pump VFD stacks. Only use shielded twisted-pair 4–20 mA instrument cable, with single-point shield grounding at the flowmeter terminal housing earth lug.❗Power Supply Mismatch: Calculate total analog loop load with a minimum 20 % power headroom. Stacking six transmitters each fitted with this cartridge overloads aged DCS analog output modules, triggering uncommanded flow signal clamping at 4 mA.❗ESD Damage: Low-humidity chemical plant pipe racks build static charge that burns the onboard HART UART transceiver chip instantly. Lay an anti-static mat under the transmitter enclosure, wear a grounded wrist strap, and touch bare metal pipe ground for three seconds before handling the exposed cartridge contact edge.Keep these in mind and you’ll cut 90% of rework time.
Compatibility Matrix & Benchmarks
Compatibility Matrix
- -XC extended coating variant → : Direct — identical HART firmware and contact pinout; XC conformal coating improves salt-fog resistance for coastal offshore pipeline installations
- base flow transmitter → : Direct — precision machined internal cavity with matching cartridge contact pin alignment for plug-and-field insertion
- CSA464AE Advant S100 analog output card → : Direct — standard 4–20 mA analog loop signaling with zero DCS register edits to read HART digital flow diagnostics
- Third-party HART field communicators → : Direct — universal HART Revision 7 register mapping compatible with all brand handheld HART masters
Benchmarks
- HART digital polling cycle: 450 ms (full set of flow, temperature, lining wear diagnostic registers polled sequentially)
- Comms throughput: 300 bps (fixed HART protocol line rate)
- Fault detection latency: < 4.0 ms (broken analog field loop diagnostic flag transmitted via HART to DCS HMI)
