NCB5-18GM40-N0 inductive sensor: sensing distance, NAMUR wiring and replacement checks

Pepperl+Fuchs NCB5-18GM40-N0 is a 2-wire NAMUR inductive sensor for noncontact detection of a metal target. The 5 mm value is the rated operating distance under the manufacturer's reference conditions, while the assured distance is shorter. Confirm the real target material, mounting position and connected NAMUR input before specifying a spare. The shared product montage is a category reference image, not an exact photograph of NCB5-18GM40-N0.

Key technical data

Detection and mounting

For NCB5-18GM40-N0, set the sensing gap from the assured operating distance, allowing for target size, material and mechanical tolerance. Flush mounting affects the surrounding metal clearance. Aluminum, copper and stainless steel can produce different response distances from the reference target. Test the actual moving part rather than relying on the 5 mm code alone.

Electrical interface

The NCB5-18GM40-N0 output is NAMUR, not a standard three-wire PNP or NPN transistor output. Match its two conductors to a compatible isolating switch amplifier or control input and check the hazardous-area circuit design if applicable. Verify cable route, polarity, connector or terminal assignment and any line-fault monitoring in the receiving module.

Replacement and commissioning

Before changing NCB5-18GM40-N0, record the exact label, cable length, mounting thread, sensing-face position and normal target gap. Isolate the circuit under site rules. After fitting, check the target-detected and target-absent states, PLC indication, any safety interlock and the required fault response. A visually similar M18 sensor may have a different output or connection.

Procurement details

Quote Pepperl+Fuchs NCB5-18GM40-N0 with installation photos, cable length, expected target material, NAMUR interface and environmental requirements. Ask for written confirmation if an alternative termination or approval code is proposed. Keep the complete suffix because the body appearance alone cannot establish an electrical match.

Related model references

These visually similar NCB5-18GM40 variants differ in cable or connector arrangement and potentially electrical details. They are references for enquiry, not automatic substitutes.

• NCB5-18GM40-N0-5M
• NCB5-18GM40-N0-V1
• NCB5-18GM40-Z0

Manufacturer documentation

For NCB5-18GM40-N0, check the latest Pepperl+Fuchs datasheet and the complete label against the installed device before final selection or commissioning.