Description
MTL4541 Repeater Power Supply – Safe-area power and isolation for 2‑wire (HART) transmitters
The MTL4541 is part of the high-density MTL4500 series and is designed to power a 2‑wire transmitter in the hazardous area while delivering a clean, isolated 4–20 mA signal back to your control system. From my experience, this is the go-to module when you need HART pass-through without compromising intrinsic safety or loop stability. You might notice that it slots straight into an MTL4500 backplane, which keeps cabinets tidy and makes maintenance fast.
Typical applications include fuel farm tank gauging, refinery pressure loops, or pharmaceutical cleanroom differential pressure where Zone 0/1 transmitters must remain energised safely. One thing I appreciate is how it handles HART diagnostics transparently, so asset management systems can interrogate the field device without extra hardware in most cases.
Our Order Placement Process and Guarantees
- Warranty: 365 days
- Lead time: 1 week if in stock; no more than one month at the latest
- Payment: 50% advance payment; full payment prior to delivery
- Express options: FedEx, UPS, DHL
Key Features
- Repeater power supply for 2‑wire transmitters – Safely energises a transmitter in the hazardous area and repeats the 4–20 mA signal to the safe area.
- HART transparency – Passes HART signals bi‑directionally over the same loop for configuration and diagnostics.
- Galvanic isolation – Breaks ground loops and improves measurement integrity in noisy industrial environments.
- Backplane-mounted, high density – Fits the MTL4500 backplane for neat wiring, simplified power distribution, and fast module changes.
- Robust signal handling – Low noise design that, in many cases, improves control loop stability compared with legacy barriers.
- Status indication – Front-face LEDs for quick loop status checks during commissioning or maintenance.
- Industrial temperature range – Designed for control cabinets in harsh plants; typically suitable for –20 to +60°C operation.
- Safe-area installation – Used as associated apparatus for Ex i loops, keeping all electronics in the safe area.
Technical Specifications
| Brand / Model | MTL / MTL4541 (MTL4500 series) |
| HS Code | 8543.70 – Electrical machines and apparatus having individual functions |
| Power Requirements | 24 V DC via MTL4500 backplane (typical backplane supply range 20–35 V DC) |
| Operating Temperature | –20 to +60°C (typical) |
| Signal Input / Output | Input: 2‑wire transmitter in hazardous area; Output: isolated 4–20 mA to safe area; HART pass-through |
| Communication Interfaces | HART communication carried over the 4–20 mA loop (bi-directional) |
| Isolation | 3-port galvanic isolation between field, control, and power |
| Installation Method | MTL4500 series backplane in safe area; backplane typically mounted on DIN rail |
“We swapped legacy barriers for MTL4541 on a crude unit revamp. HART came alive without extra wiring and the cabinet footprint dropped. Commissioning was faster than expected.” — Maintenance Supervisor, downstream refinery
Related or Supporting Products
- MTL5541 – DIN-rail version of the repeater power supply; ideal if you do not use MTL4500 backplanes but still need HART transparency.
- MTL5541S – Enhanced DIN-rail variant with advanced features and diagnostics in some configurations.
- MTL4500 Backplanes – Required for MTL4541 modules; offered in multiple slot counts to match cabinet density and power distribution strategies.
- MTL HART modem / asset management tools – For host-side configuration and device diagnostics over the same 4–20 mA loop.
Installation & Maintenance
- Cabinet environment: Install the MTL4500 backplane in a dry, vibration-free control cabinet with adequate ventilation; keep ambient within the specified temperature range.
- Grounding and segregation: Earth the backplane as instructed by MTL; segregate IS field wiring from non‑IS wiring to maintain creepage/clearance.
- Field wiring: Use certified IS field devices and cable parameters compatible with the loop; verify entity parameters per the hazardous-area approval label.
- HART considerations: Maintain loop impedance within HART limits; most DCS/AMS hosts will communicate without additional resistors on the safe side.
- Commissioning: Check LED status, confirm 24 V DC to the backplane, then verify 4–20 mA span with the transmitter powered through the module.
- Maintenance: Modules are typically hot‑swappable on the backplane; keep terminals clean, review loop diagnostics periodically, and update firmware/config tools if provided by the manufacturer.
- Safety: De-energise the loop and follow site hot‑work procedures before moving field wiring; only trained personnel should work on Ex-related circuits.
Quality & Certifications
- CE / UKCA compliance for relevant EMC and safety directives.
- ATEX / IECEx approvals as associated apparatus for use with intrinsically safe (Ex i) loops; exact markings appear on the module label.
- UL/cUL listings are commonly available for North American installations.
- RoHS compliant materials control.
- Warranty: 365 days from us; manufacturer’s standard policies may also apply depending on the supply route.
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