Pepperl+Fuchs NCB5-18GM40-NO Inductive Proximity Sensor, Cylindrical, NCB Series, M18, NAMUR, 8-25V, 5mm Sensing Range
Pepperl+Fuchs NCB5-18GM40-NO Inductive Proximity Sensor, Cylindrical, NCB Series, M18, NAMUR, 8-25V, 5mm Sensing Range - Image 2
SKU: SENS-1206
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Pepperl+Fuchs NCB5-18GM40-NO Inductive Proximity Sensor, Cylindrical, NCB Series, M18, NAMUR, 8-25V, 5mm Sensing Range

₹14,869.00 (Inclusive of all taxes)
Out of Stock

The Pepperl+Fuchs NCB5-18GM40-NO is a NAMUR-compliant inductive proximity sensor designed for intrinsically safe and safety-critical industrial automation systems. Featuring an M18 stainless steel cylindrical housing, it provides a 5mm sensing range with a 2-wire NAMUR output interface compatible with 8-25V DC control systems.

Features

  • NAMUR 2-wire intrinsically safe output for hazardous area applications.
  • 5mm rated sensing distance with flush-mountable M18 stainless steel housing.
  • Wide operating voltage range from 8V to 25V DC with reverse polarity protection.
  • High durability with IP66/IP67 protection and -25°C to 100°C operating temperature.
  • SIL 2 compliant (IEC 61508) for safety-critical system integration.

Out of stock

Description

The NCB5-18GM40-NO is a NAMUR-type inductive proximity sensor engineered for reliable non-contact detection in demanding industrial environments. Its operating principle is based on the damping of an oscillating circuit by a metallic target, providing a robust and wear-free sensing solution. The sensor outputs a NAMUR signal, a two-wire, intrinsically safe interface standard for connecting to safety barriers and isolators in potentially explosive atmospheres.

Constructed with a V2A (AISI 304) stainless steel cylindrical housing, the sensor is built for mechanical durability and corrosion resistance. It features integrated protection against short circuits and reverse polarity, ensuring operational safety and longevity. With a switching frequency up to 400 Hz and a typical hysteresis of 5%, it delivers fast and stable response for precise automation control in applications ranging from machine tools to process industry safety systems.

Key Features

  • NAMUR intrinsically safe output (2-wire) for hazardous location compliance.
  • Rugged M18 x 1 cylindrical housing machined from V2A stainless steel.
  • 5mm nominal sensing distance (Sn) with flush mounting capability.
  • Wide supply voltage range: 8V to 25V DC; nominal 8.2V.
  • High environmental protection rated IP66/IP67 (dust-tight and waterproof).
  • Extended operating temperature from -25°C to +100°C.
  • Integrated short-circuit and reverse polarity protection for enhanced reliability.
  • LED status indicator for visual confirmation of switching state.

Applications

  • Position and presence detection of metal parts in safety-critical automation systems (SIL 2).
  • Intrinsically safe monitoring within hazardous areas in chemical, oil & gas, and pharmaceutical industries.
  • End-of-travel and limit sensing on machine tools and robotic arms with metallic components.
  • Fluid level detection via metal float targets in tanks and vessels.
  • High-temperature process monitoring in foundries, forging, and plastic injection molding machinery.

Technical Specifications

Model NumberNCB5-18GM40-NO
Sensor TypeInductive Proximity (NAMUR)
Output TypeNAMUR (2-wire, Normally Closed)
Rated Sensing Distance (Sn)5 mm
Supply Voltage Range8 V to 25 V DC
Nominal Voltage8.2 V
Current Consumptionmin. 3 mA
Switching Frequency0 – 400 Hz
Hysteresis1 – 15% (typical 5%)
Housing MaterialStainless Steel (V2A / AISI 304)
Housing ThreadM18 x 1
Protection RatingIP66 / IP67
Operating Temperature-25°C to +100°C
Safety Integrity LevelSIL 2 (IEC 61508)
Length40 mm
Outer Diameter18 mm
Weight100 g

Frequently Asked Questions

What is a NAMUR output and how does it differ from a standard PNP/NPN sensor?

A NAMUR output is a two-wire, intrinsically safe interface standard designed for use in hazardous areas. Unlike standard 3-wire PNP or NPN sensors that switch a supply voltage, a NAMUR sensor modulates a small current signal (typically 3-8 mA). This signal must be interpreted by a safety barrier or isolated amplifier (e.g., a KFD0-STC-Ex1) before connecting to a PLC, preventing ignition risks in explosive atmospheres.

Can this sensor be used for flush mounting with metal surroundings?

Yes, the NCB5-18GM40-NO is designed for flush mounting. Its sensing field is concentrated at the front face, allowing it to be installed flush in a metal bracket or mounting boss without the surrounding metal affecting its 5mm sensing range. Ensure the target is ferrous metal (steel) and approaches the sensor axially for reliable detection.

What is the purpose of the SIL 2 rating on this sensor?

The SIL 2 (Safety Integrity Level 2) rating, per IEC 61508, certifies that this sensor is suitable for use in safety functions where a medium level of risk reduction is required. It indicates the device has been designed and tested for a defined probability of dangerous failure, making it appropriate for safety-critical applications like emergency stop monitoring or machine guarding systems.

How do I wire the 2-wire NAMUR sensor to my control system?

Connect the two wires of the sensor in series with a NAMUR-compliant safety barrier or isolating amplifier. The barrier is then powered by a safe-area power supply (8-25V DC) and provides a relay or transistor output to your PLC. Never connect a NAMUR sensor directly to a standard PLC digital input, as it will not function correctly and may violate intrinsic safety requirements.

Package Includes

  • 1 x Pepperl+Fuchs NCB5-18GM40-NO Inductive Proximity Sensor

Additional Information

Weight 0.1 kg
Dimensions 4 × 1.8 × 1.8 cm

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