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The Endress+Hauser FMU41-ARB2A2 is a non-contacting radar level transmitter from the Micropilot series, engineered for continuous level measurement of liquids, pastes, and slurries in process vessels, storage tanks, and open channels. As legacy Micropilot FMU40 and FMU41 variants approach end-of-life or become increasingly difficult to source, plant engineers and procurement teams face mounting pressure to qualify a reliable, drop-in replacement that preserves existing wiring infrastructure, HART communication loops, and DCS/PLC integration without triggering a full instrument loop redesign.
TOPNLMS maintains verified stock of the FMU41-ARB2A2 and ships from Xiamen within 1–3 business days. Every unit undergoes pre-shipment functional verification and is covered by a 12-month warranty from the date of delivery. Whether you are executing a planned turnaround, responding to an unplanned failure, or building a strategic spare-parts buffer, the FMU41-ARB2A2 is available for immediate dispatch.
| Parameter | Legacy / Outgoing Model | FMU41-ARB2A2 (Replacement) |
|---|---|---|
| Series | Micropilot FMU40 / FMU41 (earlier order codes) | Micropilot FMU41-ARB2A2 |
| Measurement Principle | Free-space radar (FMCW) | Free-space radar (FMCW) — identical |
| Process Connection | G 1½ / MNPT 1½ threaded or flanged | Compatible thread/flange options per order code |
| Signal Output | 4–20 mA / HART 5.x | 4–20 mA / HART 7 (backward compatible with HART 5/6 masters) |
| Supply Voltage | 10.5–45 V DC (2-wire loop-powered) | 10.5–45 V DC (2-wire loop-powered) — no rewiring required |
| Wiring Compatibility | Standard 2-wire 4–20 mA loop | Direct drop-in on existing 2-wire loop — no cable changes |
| Housing / Dimensions | Aluminium T12 / T14 single/dual-chamber | Aluminium T12 / T14 — same footprint, same conduit entry |
| Communication Protocol | HART (point-to-point or multidrop) | HART 7 — compatible with existing HART multiplexers and asset management systems |
| DCS / PLC Integration | Honeywell DeltaV, Siemens PCS 7, ABB 800xA via HART I/O cards | Same HART I/O cards — no DCS configuration changes required |
| Approvals | ATEX / IECEx / FM (depending on variant) | ATEX / IECEx / FM — verify suffix code for hazardous area classification |
| Replacement Recommendation | FMU40-ARBB2A2, FMU41-ARB1A2, FMU41-ARB2A1 | FMU41-ARB2A2 is the current preferred replacement |
| Warranty | — | 12-Month Warranty from date of delivery |
A successful migration from a legacy Micropilot installation to the FMU41-ARB2A2 rarely involves the transmitter alone. In practice, field engineers encounter a cluster of interdependent components that must be evaluated in parallel to ensure a smooth cutover with minimal process downtime.
On the DCS side, plants running Honeywell Experion PKS or Emerson DeltaV typically route the 4–20 mA HART signal through a HART-enabled analog input card — for example, the Honeywell HC900 HART AI module or the Emerson DeltaV Series 2 HART I/O card. Because the FMU41-ARB2A2 is HART 7 backward compatible, these existing I/O cards require no firmware update or reconfiguration; the transmitter simply appears as a HART device on the existing loop. Plants using Siemens PCS 7 with ET 200M remote I/O and SM 331 HART analog input modules will find the same plug-and-play compatibility.
For installations where the legacy transmitter was connected via a Pepperl+Fuchs or MTL HART multiplexer, the FMU41-ARB2A2 integrates without modification. The device descriptor (DD/DTM) for the FMU41 series is available in the HART Device Library and is compatible with FieldCare, PACTware, and AMS Device Manager, allowing technicians to commission and parameterize the new transmitter using the same asset management tools already deployed on site.
Where the existing installation includes an Endress+Hauser RN221N or RN221S HART loop power supply and surge arrester, these units remain fully compatible with the FMU41-ARB2A2 and do not need to be replaced. Similarly, if the control cabinet houses an Endress+Hauser RIA15 or RIA16 loop-powered field indicator, the indicator will continue to display the 4–20 mA signal from the new transmitter without any wiring changes.
In applications where the legacy system used an Endress+Hauser Commubox FXA195 USB-to-HART adapter for local configuration, the same adapter is compatible with the FMU41-ARB2A2 and FieldCare software. For sites that have migrated to wireless configuration, the Endress+Hauser Fieldgate FXA42 HART gateway provides remote access to the transmitter’s diagnostic and configuration registers over Ethernet, enabling predictive maintenance integration with plant historian systems.
When the retrofit scope extends to the process connection — for example, when replacing a flanged FMU40 with a threaded FMU41 — a site-fabricated nozzle adapter may be required. In such cases, it is advisable to order the FMU41-ARB2A2 alongside the appropriate Endress+Hauser TW process connection adapter to ensure a leak-free, code-compliant installation without modifying the existing tank nozzle.
Finally, for plants executing a broader instrument rationalization program — replacing multiple legacy level transmitters across a tank farm — the FMU41-ARB2A2 can be deployed alongside the Endress+Hauser FMU43 (for high-temperature or high-pressure vessels) and the FMU44 (for solids and bulk materials), allowing a single-vendor, single-platform approach that simplifies spare-parts management, technician training, and DCS tag standardization.
Q: Do I need to re-pull cable when replacing a legacy FMU40 or FMU41 with the FMU41-ARB2A2?
No. The FMU41-ARB2A2 is a 2-wire, loop-powered device operating on 10.5–45 V DC, identical to the legacy Micropilot variants. Existing 2-wire shielded instrument cable is fully reusable. Verify cable insulation resistance and shield continuity before reconnection, but no new cable pull is required.
Q: Will my existing HART master (DCS, PLC, or handheld communicator) recognize the FMU41-ARB2A2?
Yes. The FMU41-ARB2A2 supports HART 7, which is backward compatible with HART 5 and HART 6 masters. An Emerson 475 or 375 Field Communicator will communicate with the device using the existing FMU41 DD. For DCS-based HART masters, ensure the device descriptor is updated in the HART Device Library if using AMS or FieldCare for advanced diagnostics.
Q: Are there any changes to the DCS tag configuration or scaling required?
No scaling changes are required if the process range (0–100% level) and the 4–20 mA output mapping remain the same. The FMU41-ARB2A2 is configured using the same parameter set as the legacy FMU41 — Empty Distance (E), Full Distance (F), and signal processing parameters — so existing DCS tag engineering units and alarm setpoints remain valid.
Q: Does the FMU41-ARB2A2 fit in the same nozzle as the legacy FMU40/FMU41?
In most cases, yes. The FMU41-ARB2A2 uses the same G 1½ or MNPT 1½ threaded process connection as the standard FMU41 variants. If the legacy installation used a flanged connection (DN50, DN80, or ANSI 2″), verify the order code suffix to confirm the correct flange rating and facing. Contact TOPNLMS with your existing tag data sheet for a compatibility confirmation before ordering.
Q: What is the minimum recommended nozzle diameter and height for the FMU41-ARB2A2?
Endress+Hauser recommends a minimum nozzle inner diameter of 50 mm (2″) and a nozzle height not exceeding 100 mm to avoid signal interference. For tall nozzles or nozzles with internal obstructions, the FMU41’s built-in echo suppression (mapping function) can be used to suppress false echoes during commissioning.
Q: How long does commissioning take on site?
For a direct replacement with no process range changes, commissioning typically takes 30–60 minutes per transmitter: mount the device, reconnect the 2-wire loop, power up, verify the HART communication link, run the echo mapping routine, and confirm the 4–20 mA output against a known reference level. No special tools are required beyond a HART communicator or laptop with FieldCare.
Every FMU41-ARB2A2 unit supplied by TOPNLMS is covered by a 12-month warranty from the date of delivery. Our pre-shipment inspection protocol includes:
If a unit is found to be defective on arrival (DOA) or fails within the warranty period under normal operating conditions, TOPNLMS will arrange a replacement shipment or full refund at no additional cost. Our after-sales response target is 24 hours for initial acknowledgment and 72 hours for resolution proposal.
For procurement teams requiring documentation, we can provide a Certificate of Conformance, packing list, and commercial invoice with HS code 9026.10 for customs clearance. Bulk orders of 3 or more units qualify for priority allocation and dedicated account support.
To place an order or request a compatibility confirmation, contact our technical sales team:
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