TURCK MS13-22Ex0-R – Intrinsically Safe Switching Amplifier | MS13 Series
Engineering Background
In process industries where flammable gases, vapors, or dusts are present, field sensors must be isolated from control-room electronics by certified intrinsic safety barriers or switching amplifiers. The TURCK MS13-22Ex0-R is a galvanically isolated switching amplifier designed to interface NAMUR-compliant proximity sensors and mechanical contacts located in Zone 0/1/2 (Gas) or Zone 20/21/22 (Dust) hazardous areas with safe-area PLC or DCS inputs. It converts the low-energy NAMUR signal into a clean relay output, eliminating ground-loop noise and providing the certified energy limitation required by IEC 60079-11.
Product Positioning
The MS13-22Ex0-R occupies the single-channel, relay-output tier of TURCK’s MS13 switching amplifier family — the preferred choice for discrete on/off detection in Ex-rated installations where relay isolation, wire-break detection, and short-circuit detection are mandatory. It is a direct drop-in for legacy TURCK MS13 installations and is fully compatible with standard 35 mm DIN rail marshalling cabinets.
Complete Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | MS13-22Ex0-R |
| Manufacturer | TURCK (Hans Turck GmbH & Co. KG, Germany) |
| Function | Switching amplifier, NAMUR / dry-contact input → relay output |
| Input Type | NAMUR (EN 60947-5-6) proximity sensor or mechanical contact |
| Input Voltage (field side) | 8.2 V DC (NAMUR supply) |
| Switching Threshold (NAMUR) | ON: > 2.1 mA; OFF: < 1.2 mA |
| Wire-Break Detection | Yes (< 0.1 mA triggers fault) |
| Short-Circuit Detection | Yes (> 6 mA triggers fault) |
| Output Type | Single-pole relay (SPDT) |
| Output Contact Rating | 250 V AC / 2 A; 30 V DC / 2 A (resistive) |
| Supply Voltage | 20–35 V DC or 20–253 V AC (universal) |
| Power Consumption | ≤ 1.5 W |
| Galvanic Isolation | Input / Output / Supply: 3-way isolation, 500 V AC test |
| Ex Certification | ATEX / IECEx: II (1) GD [Ex ia] IIC / IIB+H₂ / IIIC |
| Safe-Area Enclosure | IP20, polycarbonate housing |
| Mounting | 35 mm DIN rail (EN 60715) |
| Width | 12.5 mm (single-width) |
| Operating Temperature | –20 °C to +60 °C |
| Storage Temperature | –40 °C to +85 °C |
| Relative Humidity | ≤ 95 % RH, non-condensing |
| LED Indicators | Green (power), Yellow (output status), Red (fault) |
| Connection | Screw terminals, 0.2–2.5 mm² |
| Weight | Approx. 80 g |
| Country of Origin | Germany |
Proven Application Environments
- Oil & Gas: Wellhead valve position feedback, pipeline pig detector interfaces, compressor surge detection — all requiring Zone 1 / IIC certification.
- Chemical & Petrochemical: Reactor level switches, pump seal-failure detection, agitator speed monitoring in Zone 1/2 areas.
- Pharmaceutical: Dust-Ex (Zone 21) tablet press and granulator position sensing where NAMUR inductive sensors are standard.
- Wastewater Treatment: Submersible pump run/fault feedback in wet, corrosive environments with Zone 2 classification.
- Grain & Food Processing: Zone 22 dust-ignition-proof conveyor belt monitoring and silo level detection.
- Power Generation: Turbine lube-oil system valve position feedback requiring relay isolation from DCS I/O cards.
Engineering Advantages
- 3-Way Galvanic Isolation: Eliminates ground loops between field instruments and control-room I/O — critical in large plants with multiple earthing points.
- Universal Supply Voltage: 20–253 V AC/DC accepts any marshalling cabinet power rail without additional converters.
- Wire-Break & Short-Circuit Monitoring: Continuous line fault detection per NAMUR NE 43 — the relay de-energises on fault, providing fail-safe behavior.
- 12.5 mm Slim Profile: High-density marshalling: 80 channels per meter of DIN rail.
- ATEX + IECEx Dual Certification: Accepted in EU, Middle East, Australia, and most Asian jurisdictions without re-certification.
- Plug-Compatible with MS13 Family: Direct replacement for existing MS13 installations — no rewiring required.
- LED Tri-Color Diagnostics: Power, output state, and fault status visible at a glance during commissioning and maintenance.
System Architecture & Signal Flow
The MS13-22Ex0-R sits at the boundary between the hazardous area (Zone 0/1/2) and the safe area (control room). Signal flow is as follows:
- Field Side (Ex Zone): NAMUR inductive proximity sensor or dry contact wired to terminals 1 & 2. The amplifier supplies 8.2 V DC at limited energy (Ui, Ii, Pi per ATEX certificate) to the sensor loop.
- Switching Amplifier Core: Internal comparator evaluates loop current against NAMUR thresholds. Wire-break (<0.1 mA) and short-circuit (>6 mA) conditions are detected and mapped to relay fault state.
- Relay Output (Safe Area): SPDT relay contacts (terminals 11, 12, 14) switch the PLC/DCS digital input. Relay energises when sensor is active (target present / contact closed).
- Supply (Safe Area): Universal AC/DC supply connected to terminals 31 & 32. Fully isolated from both field and output circuits.
This architecture ensures that no fault condition on the safe-area side (supply surge, relay coil failure) can propagate energy into the hazardous area.
Sourcing & Quality Verification
- Authorized Supply Chain: Konmask.com sources TURCK products through verified industrial distributors and authorized regional channels. Each unit is inspected for intact TURCK holographic labels, undamaged terminal blocks, and matching serial number / date code.
- Certification Traceability: ATEX certificate number and IECEx certificate number are printed on the device label. Buyers can verify authenticity directly on the IECEx OD (Online Database) at iecex.iec.ch.
- Packaging Integrity: Units ship in original TURCK retail packaging with datasheet insert. Repackaged or relabeled units are not accepted in our supply chain.
- Warranty: 12-month Konmask operational warranty against manufacturing defects, supplementary to TURCK’s standard warranty terms.
Procurement Process
- Confirm Part Number: Verify MS13-22Ex0-R matches your required Ex category, gas group (IIC covers IIA and IIB), and output type (relay). For transistor output, see MS13-22Ex0-T.
- Request a Quote: Contact [email protected] with quantity, required delivery date, and destination country for freight and duty estimation.
- Documentation Package: Upon request, Konmask provides ATEX/IECEx certificate copies, EU Declaration of Conformity, and TURCK datasheet — ready for your project engineering file.
- Lead Time: In-stock units ship within 1–3 business days. Out-of-stock orders: contact us for current lead time from TURCK distribution.
- Payment & Terms: T/T bank transfer, PayPal, and trade-credit terms available for qualified accounts. Contact us for NET-30 application.
Technical FAQ
Q: Can the MS13-22Ex0-R be used with a mechanical dry contact instead of a NAMUR sensor?
A: Yes. Connect the dry contact across terminals 1 & 2. The amplifier detects contact closure (loop current rises above 2.1 mA) and opens (current drops below 1.2 mA). Wire-break detection remains active.
Q: What is the maximum cable length to the field sensor?
A: Determined by the ATEX certificate’s maximum allowed cable capacitance (Cc) and inductance (Lc). Refer to the TURCK certificate for exact values; typical installations support 300–500 m with standard instrument cable.
Q: Is the relay output fail-safe?
A: Yes. The relay is energised in the normal (sensor active) state and de-energises on sensor inactive, wire-break, or short-circuit — providing de-energise-to-trip (DTT) fail-safe behavior.
Q: Can multiple MS13-22Ex0-R units share a common DIN rail power bus?
A: Yes. The universal supply input is isolated; units can be powered from a common 24 V DC bus rail without interaction between channels.
Q: What is the difference between MS13-22Ex0-R and MS13-22Ex0-T?
A: The -R suffix denotes relay output (SPDT contact); the -T suffix denotes transistor (PNP) output. Use -R for high-current loads or voltage-free contact requirements; use -T for fast-switching PLC sink inputs.
Q: Is CE marking included?
A: Yes. The MS13-22Ex0-R carries CE marking under the ATEX Directive 2014/34/EU and the Low Voltage Directive 2014/35/EU.
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