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Brand: Phoenix Contact
Phoenix Contact MACX MCR-EX-SL-NAM-R NAMUR Isolating Amplifier
Description
MACX MCR-EX-SL-NAM-R Ex i NAMUR isolating amplifier, 1-channel
The MACX MCR-EX-SL-NAM-R (item number 2865434) is an intrinsically safe isolating switch amplifier from the MACX MCR-EX-SL family. It reads NAMUR proximity sensors and mechanical contacts installed in a hazardous area, monitors the field wiring for breaks and short circuits, and passes the switching state across a safe galvanic barrier to a relay output in the safe area. It has one channel and a changeover relay contact, so the output can be used as normally open or normally closed, and the device is only 12.5 mm wide. Seven Star LLC supplies the MACX MCR-EX-SL-NAM-R in Oman and the GCC as an independent supplier in Muscat, and this page summarises the manufacturer data sheet for engineers preparing an instrumentation RFQ.
What the MACX MCR-EX-SL-NAM-R designation means
- MACX MCR: Phoenix Contact signal conditioner family for DIN rail mounting.
- EX-SL: Ex i (intrinsically safe) input, slim housing with power bridging.
- NAM-R: NAM-R: one NAMUR input channel with a relay (R) output.
- MACX MCR-EX-SL-NAM-R-SP: the push-in connection version of the same device (item 2924045).
MACX MCR-EX-SL-NAM-R technical specifications
| Parameter | Specification |
|---|---|
| Manufacturer / part number | Phoenix Contact MACX MCR-EX-SL-NAM-R, item no. 2865434 |
| Channels / output | 1-channel; one changeover contact relay |
| Input | NAMUR proximity sensors (IEC/EN 60947-5-6), floating contacts, contacts with resistance circuit; intrinsically safe |
| Input levels | Open-circuit voltage 8 V DC; short-circuit current 8 mA; switching threshold 0 signal < 1.2 mA, 1 signal > 2.1 mA; hysteresis < 0.2 mA |
| Line fault detection | Break < 0.05 … 0.35 mA; short circuit < 100 … 360 Ω; can be switched on or off by DIP switch |
| Relay contacts | AgSnO2, hard gold-plated; 250 V AC (2 A), 120 V DC (0.2 A), 30 V DC (2 A); switching frequency ≤ 20 Hz; mechanical life 107 cycles |
| Supply | 24 V DC (-20 % … +25 %), range 19.2 … 30 V DC; max. current consumption 21 mA at 24 V DC; power dissipation < 1 W |
| Isolation | 3-way electrical isolation; test voltage 2.5 kV AC (50 Hz, 60 s) |
| Intrinsic safety data | Uo 9.6 V, Io 10 mA, Po 25 mW |
| Ex marking listed | ATEX II (1) G [Ex ia Ga] IIC, II (1) D [Ex ia Da] IIIC, I (M1) [Ex ia Ma] I; IBExU 07 ATEX 1069 X; installation in Ex zone 2 permitted |
| Functional safety | Up to SIL 2 (1oo1) / SIL 3 (1oo2) per IEC/EN 61508 |
| Ambient temperature | -40 °C … +60 °C in any position; up to +70 °C with derating; humidity 10 … 95 % non-condensing |
| Dimensions | 12.5 x 112.5 x 113.7 mm (W x H x D) for the screw version |
| Housing | PA 6.6-FR, UL 94 V0, IP20 |
How the MACX MCR-EX-SL-NAM-R processes the NAMUR signal
A NAMUR sensor changes its current draw instead of switching a voltage: around 1 mA or less when blocked and 2 mA or more when conductive. The MACX MCR-EX-SL-NAM-R supplies about 8 V to the loop and measures this current against the thresholds in the data sheet. Between the thresholds is a hysteresis of less than 0.2 mA, so the output does not chatter. If the loop current falls below roughly 0.05 to 0.35 mA the device sees a line break, and if the loop resistance falls below about 100 to 360 Ω it sees a short circuit. Faults are signaled by a red flashing LED according to NE 44, and the output goes to a high-impedance state. DIP switches let the user invert the direction of action (normally open or normally closed behaviour) and enable or disable line fault detection, which matters when the field device is a plain contact without the resistors that NAMUR wiring requires.
Power and fault bridging with the DIN rail connector
Instead of wiring 24 V to each module, the MACX MCR-EX-SL-NAM-R can be supplied through the DIN rail connector (TBUS) from a power and fault signaling module such as the MACX MCR-PTB (2865625) or its push-in variant MACX MCR-PTB-SP (2924184). The same bus can carry the collective fault message. The data sheet also lists the MCR-DP divider plate (1430594), which keeps the intrinsic-safety separation distances when Ex i and non-Ex i modules sit next to each other, and the TC-2D37SUB-ADIO32-2EX-P-UNI termination carrier for connecting 16 two-channel MACX Analog Ex i conditioners to I/O cards with D-SUB connectors.
Where it fits and related types
The MACX MCR-EX-SL-NAM-R is the single-channel version of the family. For two sensors in the same 12.5 mm width, the manufacturer offers the MACX MCR-EX-SL-2NAM-RO (2865476) with one N/O contact per channel. Each module has a push-in sibling with the suffix -SP: the MACX MCR-EX-SL-NAM-R-SP (2924045). It integrates into DIN-rail marshalling next to other MACX Analog Ex i conditioners, and it reports faults through the TBUS rail to a MACX MCR-PTB module.
Selection and ordering checklist
- Confirm the sensor type: NAMUR proximity switch (EN 60947-5-6) or a contact, with or without resistor network.
- Check the intrinsic-safety parameters of the field device and cable against Uo, Io and Po.
- Decide on screw or push-in connection (MACX MCR-EX-SL-NAM-R or MACX MCR-EX-SL-NAM-R-SP).
- Decide whether the output is one changeover contact relay and whether the relay ratings fit the downstream load.
- Plan power bridging and fault signaling, and divider plates where Ex i and non-Ex i devices are neighbours.
- Check the SIL requirement and the hardware version stated in the data sheet.
Installation, commissioning and maintenance
Snap the MACX MCR-EX-SL-NAM-R on a 35 mm DIN rail with the Ex i side clearly separated and the intrinsically safe terminals kept apart from non-intrinsically safe wiring. Set the DIP switches for the required direction of action and line fault detection before power-up, check the yellow status LED while operating the sensor by hand, and test the line fault indication by lifting a field wire. For a safety function, record the proof-test procedure and the hardware version from the data sheet in the safety file. Because the relay has a stated mechanical life of 10 million cycles, contact wear is rarely an issue but the load must stay within the ratings above.
Typical applications in Oman and the GCC
NAMUR isolating amplifiers are standard in oil and gas wellhead and pipeline facilities, tank-farm limit switching, valve position feedback on actuated valves, rotating-equipment skids and chemical dosing units, wherever sensors in Zone 0, 1 or 2 areas have to be connected to a PLC or DCS in a safe area. The wide ambient range from -40 to +60 °C suits marshalling cabinets in desert and offshore sites, as long as the cabinet is kept clean and dry.
Information to send with an RFQ
- Full type designation or item number, and quantity
- Field signal type and range, and whether the device is in a hazardous area (zone, gas group, temperature class)
- Output signal needed (relay, 4-20 mA, voltage) and load
- Supply voltage available and whether DIN rail power bridging is planned
- Required safety integrity level or approvals
- Delivery location and documents needed
Documents and quotation
The manufacturer data sheet for the MACX MCR-EX-SL-NAM-R is attached on this page.
Send item number 2865434, quantity and delivery location to Seven Star LLC and request a quotation.
Datasheets & Documents
- Datasheet Phoenix Contact MACX MCR-EX-SL-NAM-R Datasheet Download
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About brand
Phoenix Contact is a German, family-owned manufacturer of electrical connection technology and industrial automation, founded in 1923 in Essen by Hugo Knümann. It began as a sales company, and in 1928 Knümann developed the modular terminal block mounted on a rail, the product the company is still best known for. Phoenix Contact is headquartered in Blomberg, North Rhine-Westphalia.
Seven Star LLC lists Phoenix Contact surge protection, power supplies and safety relays, and sources these components by order number for panel builders and maintenance teams in Oman.
Phoenix Contact company profile
| Founded | 1923, Essen, Germany, by Hugo Knümann, as Phönix Elektro- und Industrie-Bedarfsgesellschaft |
|---|---|
| Headquarters | Blomberg, Germany |
| Ownership | Family-owned (Eisert and Stührenberg families) |
| Key invention | The modular terminal block on a DIN rail, 1928 |
| Product families | CLIPLINE terminal blocks, PCB terminals and connectors, QUINT and TRIO power supplies, relay modules, surge protection, signal conditioners, Ethernet switches and PLCnext controllers |
Milestones
- 1923: Hugo Knümann founds the company in Essen.
- 1928: The first modular terminal block is developed.
- Later: Headquarters move to Blomberg, Ostwestfalen-Lippe.
Phoenix Contact parts listed on this page
The TTC-6-2X1-24DC-UT (order number 2906799) is a surge protection device with screw connection for two 24 V DC signal wires that share a common reference potential. The QUINT-PS/1AC/24DC/10 is a single-phase DIN rail power supply delivering 24 V DC at 10 A. The PSR-SCP-24DC/ESP4/2X1/1X2 (order number 2981020) is a single-channel PSR safety relay for emergency stop and safety door monitoring, with two enabling current paths and plug-in screw terminals.
Phoenix Contact products we list
Ordering Phoenix Contact components: what we need
Phoenix Contact items are ordered by a seven-digit order number together with the type designation, both printed on the side of the module. Send both, plus the quantity. If the number is unreadable, send the type text and a photo. For power supplies, state input voltage, output current and whether the unit runs in parallel or with a redundancy module. For buyers in the GCC replacing an older unit, we check the manufacturer's documentation for the listed successor type.
Facts checked against Phoenix Contact's own company history (phoenixcontact.com), October 2026.
Browse Phoenix Contact products by category: Isolator & Barrier, Power Modules, Automation Accessories.
FAQ
Questions about the Phoenix Contact MACX MCR-EX-SL-NAM-R NAMUR
Answers from our engineering team on installation, compatibility and integration.
01What does the MACX MCR-EX-SL-NAM-R do?
It isolates a NAMUR proximity sensor or contact located in a hazardous area and transmits its state to a changeover relay output in the safe area, with line fault detection and SIL 2 capability.
02What is the safety integrity level?
The data sheet states use up to SIL 2 (1oo1) and SIL 3 (1oo2) according to IEC/EN 61508.
03What are the intrinsically safe output values?
Uo is 9.6 V, Io is 10 mA and Po is 25 mW, with ATEX marking II (1) G [Ex ia Ga] IIC and certificate IBExU 07 ATEX 1069 X.
04How is it supplied?
It runs on 24 V DC (19.2 to 30 V DC) and can be supplied via the DIN rail connector. Maximum current consumption is 21 mA.
05What contact rating does the relay have?
The data sheet lists 250 V AC at 2 A, 120 V DC at 0.2 A and 30 V DC at 2 A with AgSnO2 hard gold-plated contacts.
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