Emerson (Rosemount, Micro Motion) · Level Measurement
Rosemount 5408 Non-Contacting Radar Level Transmitter
Part number 5408A1S1S1AAA2AR4G
Two-wire FMCW non-contacting radar for liquid level, 26 GHz, ±2 mm accuracy, measuring range up to 40 m, cone or process-seal antenna, SIL2/3.
- CE
- ATEX
- IECEx
- SIL2
- HART 7
Overview
The Rosemount 5408 is Emerson's two-wire non-contacting radar for liquids, using FMCW technology at 26 GHz for a stronger return signal and more robust measurement in turbulent, foaming or vapour-laden tanks than pulse radar of the same frequency. Accuracy is ±2 mm with measuring ranges up to 40 m, and the device is certified for SIL2/3 overfill prevention loops. The Smart Meter Verification and Power Advisory diagnostics report antenna fouling and loop power problems before they cause a lost measurement. Antenna options include cone (316L or Alloy), process-seal flush PTFE and parabolic for long ranges; the example string is a 3-inch cone antenna with HART and ATEX intrinsically safe approval.
Key features
- FMCW 26 GHz two-wire radar with higher signal-to-noise ratio than pulse radar
- Accuracy ±2 mm, measuring range up to 40 m, update rate 1 s
- Cone, process-seal (flush PTFE) and parabolic antennas; bypass/still-pipe mode
- Smart Meter Verification, Power Advisory and echo-curve diagnostics via HART 7
- SIL2 (SIL3 redundant) per IEC 61508; ATEX, IECEx, FM, CSA; overfill prevention per API 2350
Typical applications
- Storage tanks for fuels, solvents and chemicals
- Reactor and buffer vessels with agitation and foam
- Overfill prevention and high-level alarms
- Water reservoirs and open basins
Technical specifications — 5408A1S1S1AAA2AR4G
| Measurement | |
|---|---|
| Measuring principle | FMCW non-contacting radar, 26 GHz |
| Measuring range | up to 40 m (parabolic antenna) |
| Accuracy | ±2 mm |
| Beam angle | 8°–19° depending on antenna |
| Output | |
| Signal | 4–20 mA HART 7 (FF option) |
| Display | LCD with local operator interface option |
| Power | 16–42.4 V DC, two-wire |
| Process | |
| Process temperature | -40…+200 °C (antenna dependent) |
| Process pressure | full vacuum to 51 bar |
| Process connection | Threads 1.5–4 in, flanges ANSI/DIN, Tri-Clamp |
| Antenna materials | 316L SST, Alloy C-276, PTFE |
| Environment | |
| Ambient temperature | -40…+80 °C |
| Enclosure | IP66/67, aluminium or 316L housing |
Specifications are summarised from the manufacturer's documentation for selection purposes. Always confirm against the current datasheet before design-in; we send the datasheet and the exact ordering code with every quotation.
Related part numbers and alternatives
| Part number | Relationship | |
|---|---|---|
5408:SIS | SIL-rated version for overfill safety loops | Quote |
5300 | Rosemount 5300 guided-wave radar for interface and low-dielectric liquids | Quote |
1408H | Hygienic 80 GHz radar for food and pharma tanks | Quote |
Not sure which variant you need? Send us the nameplate photo or the old part number and we will identify the current equivalent.
Supply, documentation and lead time
What you receive
- Genuine Emerson (Rosemount, Micro Motion) product in original packaging
- Commercial invoice and packing list; Certificate of Conformance on request
- Datasheet, declaration of conformity and country of origin as issued by the manufacturer
- Manufacturer warranty, period stated on the quotation
How we quote
- Reply within one business day with price, lead time and stock position
- Alternatives proposed when they improve price or delivery
- Incoterms of your choice: EXW Hai Phong, FOB/FCA, CIF/DAP to your site
- Consolidated shipments for multi-line orders; export documentation for buyers outside Vietnam
Indicative HS code 9026.10 — final classification is confirmed on the commercial invoice.
Frequently asked questions
What is the advantage of FMCW over pulse radar at the same frequency?
FMCW transmits continuously and extracts level from the frequency difference, which yields a stronger return signal. In practice the 5408 keeps measuring through foam, condensation and agitator blades where a pulse radar may lose the echo.
Can the 5408 be used for overfill prevention?
Yes. The 5408:SIS version is certified to IEC 61508 SIL2 (SIL3 in redundant use) and supports proof testing per API 2350 without emptying the tank.
Is the Rosemount 5408 available from stock, and what is the lead time?
Typical factory lead time is 4–6 weeks; cone-antenna HART versions are often faster. We confirm with the quotation.