The IS 112 MM/2NO-4E0 from Leuze electronic is a high-performance inductive proximity switch designed for precision and durability in industrial automation environments. This sensor is known for its compact design, robust construction, and reliable detection capabilities.
Product Name: Inductive Switch
Part Number: 50129864
Model: IS 112 MM/2NO-4E0
Manufacturer: Leuze electronic GmbH + Co. KG
Country of Origin: Germany
Series: 112
Design: Cylindrical
Housing Thread: M12 x 1 mm
Housing Color: Red (RAL 3000), Silver
Installation Type: Embedded
Active Surface Material: Plastic (PBT)
Housing Material: Nickel-plated brass
Typical Operating Range Limit (Sn): 4 mm
Usable Operating Range (Sa): 0 to 3.2 mm
Standard Measuring Plate: 12 mm × 12 mm², Fe360
Overload protection
Polarity reversal protection
Short-circuit protection
Voltage: 10–30 V DC
Residual Ripple: ≤ 10% of supply voltage
Open-Circuit Current: 0–10 mA
Switching Frequency: 3000 Hz
Switching Hysteresis: 15%
Temperature Drift: Max. 10% of Sr
Repeatability: Max. 1% of Sr
Output Type: 1 x Digital
Switching Element: Transistor, NPN
Switching Principle: Normally Open (NO)
Switching Current (Max): 200 mA
Residual Current (Max): 0.01 mA
Voltage Drop: ≤ 2 V
Number of Connections: 1
Cable Length: 2000 mm
Cable Type: 3-wire
Sheathing Material: PVC
Wire Cross Section: 0.35 mm²
Cable Color: Black
Conductor Colors and Assignments:
Brown: V+
Blue: GND
Black: OUT 1
Operating Temperature Range: -25°C to +70°C
Storage Temperature Range: -25°C to +70°C
Degree of Protection: IP67
Compliance Standard: IEC 60947-5-2
Display Type: LED
LED Color: Yellow
Function: Continuous light when switching state is active
Dimensions (Ø x L): 12 mm x 50 mm
Thread Size: M12 x 1 mm
Mounting Method: Threaded
IS: Inductive Switch
112: Series (M12 thread)
MM: Metal housing with plastic sensing face
2NO: NPN transistor, Normally Open output
4E0: 4 mm range, Embedded installation
ECLASS: 27274001 (Versions 12.0 to 15.0)
ETIM: EC002714 (Versions 5.0 to 10.0)
Customs Tariff Number: 85365019
This product is not a safety sensor and should not be used for personnel protection.
Installation and operation must be done by qualified personnel only.
Always follow the intended use guidelines and reference full documentation
Complete dimension drawings, electrical wiring diagrams, and part numbering are available in the original datasheet.
Active sensing area and LED display are clearly marked in the visual layout.
Use this checklist to systematically diagnose and resolve issues with the sensor:
✅ Check if 10–30V DC power supply is correctly connected to brown (V+) and blue (GND) wires.
✅ Ensure no open circuit exists in the power supply line.
✅ Verify that wire cross-section (0.35 mm²) matches connection standards.
✅ Inspect the cable for cuts, wear, or corrosion.
✅ Confirm all wiring terminals are tight and secure.
✅ Make sure the black wire (OUT) is correctly routed to the input module.
✅ If output is not received, measure voltage between black and blue wires.
✅ Verify the transistor output load current does not exceed 200 mA.
✅ Check if the output is pulled high when inactive (NPN logic).
✅ Confirm external load device is functioning (PLC input, relay, etc.).
✅ Ensure target material is ferromagnetic (Fe360 recommended).
✅ Confirm that sensing range does not exceed 4 mm.
✅ Check for presence of non-metallic or shielded targets blocking detection.
✅ Make sure the object is aligned correctly with the sensing face.
✅ Remove dust, oil, or moisture buildup from sensing surface.
✅ Confirm operating temperature is within -25°C to +70°C.
✅ Ensure sensor isn’t exposed to excessive vibration or impact.
✅ Make sure the sensor housing is not overheating.
✅ Keep sensor away from high-frequency electromagnetic interference (EMI).
✅ Verify protection against water ingress (IP67 — but not submersible).
✅ LED must glow yellow when the object is detected.
✅ No LED = Power loss or output failure.
✅ Blinking or dim LED = Unstable power or damaged circuit.
✅ Replace sensor if LED is non-functional despite correct wiring.
✅ Ensure sensor is properly threaded and securely mounted (M12 thread).
✅ Do not over-tighten the sensor, as it may damage the housing.
✅ Confirm minimum 3Sn clearance from metal objects around the sensor.
✅ Check for proper embedded mounting and no overhanging targets.
✅ Replace sensor and re-test to rule out hardware failure.
✅ Use an oscilloscope or multimeter to verify switching behavior and response timing (up to 3000 Hz).
The Leuze IS 112 MM/2NO-4E0 inductive switch is robust, compact, and suitable for embedded industrial installations. With proper wiring, mounting, and environmental consideration, it delivers high-speed and reliable object detection. Use the troubleshooting checklist above for effective diagnosis and uninterrupted operation.