TURCK MS13-22Ex0-R Switching Amplifier – MS13 Series

TURCK MS13-22Ex0-R NAMUR Switching Amplifier — Relay Output for Hazardous Area Discrete Control Loops

The TURCK MS13-22Ex0-R is a single-channel, galvanically isolated switching amplifier engineered to interface NAMUR-compliant inductive proximity sensors and dry mechanical contacts located in IEC 60079-classified hazardous areas (Zone 0/1/2 Gas; Zone 20/21/22 Dust) with safe-area PLC or DCS digital input cards. The device converts the low-energy NAMUR current signal into a volt-free SPDT relay output, providing the certified energy limitation mandated by IEC 60079-11 and the signal conditioning required for deterministic discrete I/O in process automation architectures.

Within a control loop, the MS13-22Ex0-R occupies the Ex-barrier tier — the boundary layer between field instrumentation and the control system. Its function is not merely signal translation; it enforces the energy budget of the intrinsically safe circuit (Ui, Ii, Pi, Ci, Li parameters per ATEX certificate), performs continuous line-fault surveillance per NAMUR NE 43, and delivers a clean, bounce-free relay contact to the safe-area I/O module. This combination of energy governance, fault detection, and output isolation makes it a structural component in any SIL-assessed discrete safety loop.

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Technical Parameters

Hardware Logical Analysis

Intrinsic Safety Energy Budget Enforcement
The MS13-22Ex0-R does not rely on fusing or zener barriers alone. Its internal current-limiting architecture maintains the field-side loop within the certified maximum values (Uo, Io, Po) at all operating conditions, including supply voltage excursions up to 35 V DC. The comparator circuit that evaluates NAMUR current thresholds is powered from a regulated internal rail, ensuring threshold accuracy is independent of supply voltage variation — a critical requirement when the device is powered from an unregulated 24 V DC bus with ±15 % tolerance.

3-Way Galvanic Isolation Architecture
The device implements transformer-based isolation between all three circuit domains: the Ex field loop, the relay output, and the supply rail. Each isolation barrier is rated at 500 V AC dielectric withstand. This architecture eliminates ground-loop currents that arise in large plants where field instruments, marshalling cabinets, and DCS I/O cards share different earthing reference potentials — a common source of spurious trips in non-isolated barrier designs.

NAMUR NE 43 Fault State Mapping
The device maps all four NAMUR signal states — active, inactive, wire-break, and short-circuit — to defined relay output states. Wire-break (loop current < 0.1 mA) and short-circuit (loop current > 6 mA) both force the relay to the de-energised position, consistent with the de-energise-to-trip (DTT) fail-safe convention. This means any cable fault between the amplifier and the field sensor results in a safe-state output at the PLC input, preventing a cable failure from masking a process event.

EMC Design and Conducted Immunity
The MS13 housing integrates internal filtering on both the supply input and the relay output terminals to suppress conducted RF interference per IEC 61000-4-6. The polycarbonate housing is dimensioned to avoid resonant cavity effects at industrial ISM frequencies (433 MHz, 868 MHz, 2.4 GHz). The relay coil drive circuit includes a transient suppression diode to prevent back-EMF spikes from coupling into the field-side circuit during relay switching — a detail that matters in high-density marshalling cabinets where 60–80 amplifiers share a common DIN rail.

Universal Supply Input
The 20–253 V AC/DC universal supply input is implemented with a bridge rectifier and wide-range switching regulator, allowing the same device to operate on 24 V DC process control buses, 48 V DC telecom-grade supplies, or 110/230 V AC marshalling cabinet rails without hardware modification. This eliminates the procurement and stocking complexity of voltage-specific variants.

System Integration Benefits

• Deterministic PLC Input Signal: The relay output presents a clean volt-free contact to the DCS/PLC digital input module, eliminating the signal conditioning burden from the I/O card and ensuring consistent input recognition across all PLC hardware platforms regardless of input threshold voltage.
• Continuous Line Integrity Monitoring: Wire-break and short-circuit detection operate in real time without polling cycles. Fault state propagates to the PLC input within the relay response time (< 10 ms), enabling the control system to distinguish a genuine process event from a cable fault — a diagnostic capability absent in passive zener barriers.
• Fail-Safe Output Behavior: DTT relay logic ensures that any loss of supply, internal component failure, or field cable fault drives the output to the de-energised (safe) state. This is directly compatible with SIL 2 safety loop architectures where the safe state must be the default condition.
• High-Density Marshalling: The 12.5 mm housing width allows 80 channels per meter of DIN rail. In a 600 mm wide marshalling cabinet, a single DIN rail accommodates 48 MS13-22Ex0-R units — sufficient for a complete process unit’s discrete Ex I/O without requiring additional cabinet space.
• Dual Certification Jurisdiction Coverage: ATEX (EU Directive 2014/34/EU) and IECEx certification are accepted in the European Union, United Kingdom, Australia, New Zealand, South Korea, and most Middle Eastern jurisdictions. A single part number covers the majority of global project requirements without re-certification or country-specific variants.
• Plug-Compatible MS13 Family Replacement: The MS13-22Ex0-R is dimensionally and electrically compatible with the existing MS13 product family. Replacement of legacy units requires no rewiring of field cables or DIN rail modifications — only the device is swapped, reducing maintenance downtime to under two minutes per channel.
• Tri-Color LED Diagnostic Transparency: The three-LED status display (supply / output state / fault) provides immediate visual confirmation of circuit status during commissioning, loop testing, and maintenance without requiring a handheld communicator or laptop connection. This reduces loop checkout time in multi-channel marshalling cabinets.
• Mechanical Contact Compatibility: In addition to NAMUR inductive sensors, the MS13-22Ex0-R accepts dry mechanical contacts (reed switches, limit switches, pressure switches) wired across the field terminals. The NAMUR threshold comparator correctly interprets contact closure and opening, making the device a universal discrete input conditioner for both sensor types.
• Isolation from DCS I/O Card Faults: The 3-way galvanic isolation ensures that a fault on the DCS I/O card (e.g., a card-level power supply failure or a short on the backplane bus) cannot propagate voltage or current into the Ex field loop. This protects the intrinsic safety certification integrity of the field circuit.

Quality Assurance & Global Logistics

Every TURCK MS13-22Ex0-R unit supplied by siemensplc.com is sourced through verified industrial distribution channels. Each device carries the original TURCK holographic authentication label, intact terminal block seals, and a traceable date code. The ATEX and IECEx certificate numbers printed on the device label can be independently verified against the IECEx Online Database (iecex.iec.ch) and the EU ATEX Equipment Register — providing buyers with direct, third-party confirmation of certification authenticity without relying solely on supplier documentation.

Units are dispatched from our Xiamen, China warehouse. Xiamen is a designated free-trade port with direct air freight connections to major industrial hubs: Frankfurt, Dubai, Singapore, Houston, and Sydney. Standard export documentation — commercial invoice, packing list, certificate of origin, and ATEX/IECEx certificate copies — is prepared for every shipment. For projects requiring expedited delivery, DHL Express and FedEx International Priority services from Xiamen typically achieve 3–5 business day door-to-door transit to Europe and North America. Sea freight consolidation is available for bulk orders exceeding 50 units.

All units are covered by a 12-month operational warranty against manufacturing defects from the date of dispatch. Warranty claims are processed with a target response time of 48 hours. Replacement units are dispatched before the defective unit is returned, minimizing plant downtime for critical installations.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
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