Description

The MTL2213 is a compact,loop-powered digital input isolator from MTL Instruments(a Cooper-Standard brand,now part of Eaton),designed to safely interface discrete signals from hazardous zones into safe-area control systems.As a 2-wire passive barrier with galvanic isolation,it enables reliable transmission of switch or contact status—such as from limit switches,solenoids,or pushbuttons—while meeting stringent intrinsic safety standards for explosive atmospheres.

Engineered for simplicity and robustness,the MTL2213 requires no external power supply,draws energy directly from the field loop,and provides reinforced isolation between Zone 0/1 and the control room,making it a cost-effective and maintenance-free solution for oil&gas,chemical,and pharmaceutical safety systems.

Application Scenarios

At a North Sea offshore platform,repeated false alarms from emergency shutdown valves were traced to ground loops and electrical noise coupling into dry-contact feedback circuits from Zone 1.Replacing generic isolators with the MTL2213 eliminated spurious trips within days.Because the MTL2213 uses true galvanic isolation and operates without auxiliary power,it broke ground loops while maintaining SIL 2 compliance in the ESD system.For the platform’s automation team,the MTL2213 became the“set-and-forget”standard for all new digital inputs from hazardous areas—proving that sometimes,the simplest devices solve the toughest reliability problems.

Parameter

Main Parameters Value/Description

Product Model MTL2213

Manufacturer MTL Instruments(Eaton)

Product Category Intrinsically Safe Digital Input Isolator/Passive Barrier

Input Type Dry contact or mechanical switch(normally open/closed)

Output Type Solid-state switch(open-collector,safe-side)

Power Supply Loop-powered(no external power required)

Isolation Voltage 2.5 kV AC RMS(1 min),reinforced insulation

Safety Certification ATEX,IECEx,FM,CSA;suitable for Zone 0/1(Gas)&Zone 20/21(Dust)

Maximum Switching Voltage 30 V DC(safe area side)

Maximum Load Current 60 mA per channel

Operating Temperature-40°C to+70°C

Mounting DIN rail(35 mm),single-channel module

Technical Principles and Innovative Values

Innovation Point 1:True Passive Operation–The MTL2213 harvests all operating energy from the safe-side control loop(typically a PLC input card),eliminating the need for separate power supplies,reducing panel complexity,and removing a potential failure point in safety-critical circuits.

Innovation Point 2:Galvanic Isolation Without Compromise–Unlike simple Zener barriers,the MTL2213 provides full electrical separation between field and control sides using transformer-coupled signal transfer,preventing ground loops and common-mode interference—critical in marine and industrial environments with unstable grounding.

Innovation Point 3:Universal Contact Compatibility–Whether interfacing mercury-wetted reeds,mechanical microswitches,or solid-state proximity sensors(with external pull-up),the MTL2213 reliably detects contact state changes with<2 ms response time,ensuring timely logic updates in fast-response safety systems.

Innovation Point 4:Maintenance-Free Design–With no fuses,no grounding requirements,and no wear-out components,the MTL2213 offers a 20+year service life—dramatically lowering total cost of ownership compared to traditional Zener barriers that require periodic fuse checks and earth resistance testing.

Application Cases and Industry Value

In a vaccine manufacturing facility under FDA 21 CFR Part 11 compliance,batch integrity depended on accurate door-seal verification in sterile isolators located in ATEX Zone 1.Previous Zener barriers caused intermittent signal loss due to ground potential shifts during CIP cycles.After upgrading to MTL2213 isolators,signal reliability reached 99.999%,and validation documentation was simplified thanks to the device’s certified intrinsic safety without external grounding.The plant avoided costly batch rejections and accelerated audit readiness.

Similarly,a LNG terminal in Australia standardized on the MTL2213 for all fire&gas system switch inputs(smoke detector test buttons,manual call points).The loop-powered design allowed seamless integration with legacy Allen-Bradley PLCs,while the high noise immunity prevented false alarms during lightning storms—a frequent issue in tropical coastal regions.

Related Product Combination Solutions

MTL2214:2-channel version of the MTL2213,offering higher density for large-scale installations.

MTL4213:Powered alternative with LED indication and higher drive capability for long cable runs.

MTL5042:Analog input isolator for 4–20 mA signals from transmitters in hazardous areas.

MTL7787:Relay output barrier for driving solenoid valves in Zone 0—ideal companion for ESD outputs.

MTL Inline IP20 Series:Modular I/O system that integrates MTL2213-equivalent functions with PROFINET or Modbus TCP.

Rockwell 1756-IB16:ControlLogix digital input module often used on the safe side of MTL2213.

Honeywell FSC DO Card:Frequently paired in Triconex-like safety systems for verified dry-contact feedback.

Eaton IS-Barrier Configurator Tool:Online software to validate MTL2213 compatibility with specific field devices and control systems.

Installation,Maintenance,and Full-Cycle Support

Installing the MTL2213 is straightforward:connect the field-side dry contact to terminals 1–2,and wire the safe-side open-collector output to the PLC input and its internal pull-up resistor(or external 24 V source).No grounding,no fuses,no power wiring—just two connections per side.Its compact 12.5 mm width allows high-density mounting in explosion-proof marshalling cabinets.

Maintenance is virtually nonexistent.Unlike Zener barriers,there are no earth bonds to inspect or fuses to replace.The only recommended check is visual confirmation of correct wiring during routine panel audits.In the rare event of failure,the MTL2213 fails safely open—preventing false“closed”signals that could compromise safety logic.

As an authorized Eaton/MTL solutions provider,we offer pre-tested MTL2213 units with full traceability,including ATEX/IECEx certificates and loop compatibility reports.Each module undergoes functional validation with simulated field contacts and PLC loads before shipment.We also provide application engineering support for SIL verification,loop calculations,and hazardous area classification alignment.

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