Description
ABB D685A1156U01 | FEX300 FEX500 Universal Backplane | Flowmeter Transmitter Replacement
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | ABB |
| Order Number | D685A1156U01 |
| ABB Type Designation | BOM-Backplane Uni Type3+Fieldhousing FET |
| Product Type | Universal backplane |
| Application | Electromagnetic flowmeter transmitter housing |
| Compatible Product Families | FEX300 / FEX500 |
| Housing Application | Dual-compartment transmitter housing |
| Field-Mount Application | Yes |
| Electrical Role | Internal interconnection/backplane |
| Standalone Controller | No |
| External I/O Module | No |
| Product Net Weight | Approximately 0.1 kg |
ABB’s spare-parts documentation explicitly identifies D685A1156U01 as the “Universal backplane for dual-compartment transmitter housing.” The same part is listed for both field-mount and round field-mount configurations.
A separate ABB-derived parts record identifies the designation as BOM-Backplane Uni Type3+Fieldhousing FET and lists a net weight of approximately 0.1 kg.
Product Introduction
The ABB D685A1156U01 is an internal universal backplane used in compatible ABB electromagnetic flowmeter transmitter housings. ABB’s FEX300/FEX500 operating documentation places this part inside the spare-parts structure for remote-mount and round field-mount transmitter configurations.
This distinction matters during procurement. D685A1156U01 is not the measurement electronics, flow sensor, CPU, communication card, or general-purpose automation backplane. It is a housing-level interconnection component, so replacement should be based on the exact FEX transmitter/housing construction rather than electrical specifications alone.
D685A1156U01
Application Scenarios & Field Pitfalls — Engineer’s Perspective
Engineering Pain Point
Backplane failures in flowmeter transmitters can produce intermittent communication, display, power, or internal connection problems that are easily mistaken for a failed transmitter electronics board. Because this component is part of the transmitter housing architecture, replacing it requires matching the physical housing and internal board arrangement.
Typical Applications
- ABB FEX300 electromagnetic flowmeter transmitter assemblies
- ABB FEX500 electromagnetic flowmeter transmitter assemblies
- Dual-compartment transmitter housings
- Remote-mount and round field-mount flowmeter configurations
ABB’s documentation specifically lists D685A1156U01 in both the field-mount and round field-mount spare-parts configurations.
Technical Pitfalls to Avoid
- Do not classify as a generic automation backplane.
The OEM documentation identifies it specifically as a universal backplane for a dual-compartment transmitter housing. It belongs to the ABB flowmeter hardware architecture. - Match the complete FEX housing configuration.
ABB lists different housing-related parts around the , including the D682A016U01 contact board assembly and separate housing covers/backplanes for other configurations. Confirm the transmitter model and mechanical housing before ordering. - Do not substitute it based only on physical appearance.
ABB also lists 3KXF002058U0100 as a backplane for a single-compartment transmitter with remote-mount design. That is a different part and should not be treated as an automatic substitute for .
Related Products
- ABB D682A016U01 — Contact board assembly for the dual-compartment transmitter housing; works with the housing architecture surrounding .
- ABB FEX300 — Electromagnetic flowmeter transmitter family in which this backplane is used.
- ABB FEX500 — Higher-function electromagnetic flowmeter transmitter family using compatible housing configurations.
- ABB D612A197U01 — Front housing cover for dual-compartment remote-mount transmitter housing, standard/Ex Zone 2 or Div. 2 configuration.
- ABB D612A197U02 — Front housing cover for dual-compartment remote-mount transmitter housing for Ex Zone 1 / Div. 1 configuration.
- ABB 3KXF002058U0100 — Backplane for a single-compartment transmitter housing with remote-mount design; functionally different from .
- ABB FET321 — FEX300 external transmitter configuration associated with the spare-part record.
- ABB FET521 — FEX500 external transmitter configuration associated with the same backplane spare part.
Procurement Check
Before approving an replacement, verify:
- Exact order number:
- ABB type designation: BOM-Backplane Uni Type3+Fieldhousing FET
- or transmitter family
- Dual-compartment housing configuration
- Field-mount versus round field-mount arrangement
- Existing internal contact-board configuration
- Housing revision and nameplate
- Mechanical mounting and connector arrangement
- Condition of mating boards and internal wiring
Recommended procurement description:
ABB Universal Backplane, BOM-Backplane Uni Type3+Fieldhousing FET, for / Electromagnetic Flowmeter Dual-Compartment Transmitter Housing.
The key point for procurement is straightforward: is a flowmeter transmitter housing backplane, not a conventional PLC/DCS backplane or I/O module. ABB’s own / documentation provides the strongest identification, so the exact transmitter housing configuration should be confirmed before substitution.
