M3M4 Ultra-Small Inductive Proximity Sensor

DAIDISIKE M3M4 ultra-small inductive proximity sensor — overview

The M3M4 Ultra-Small Inductive Proximity Sensor is a DC 3-wire metal-detection switch designed for industrial automation, with a compact size (M4 × 25 flush mounting) and precise 1 mm detection distance, supporting NPN / PNP outputs. CE and RoHS certified, it offers reliable non-contact metal sensing for space-constrained environments.

M4 × 25 flush1 mm precision sensingNPN / PNP · NO / NCDC 10 – 30 V1000 Hz responseIP65 / IP67CE · RoHS
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DAIDISIKE M3M4 inductive proximity switch — feature illustration

Product Description

The M3M4 Ultra-Small Inductive Proximity Sensor is a high-performance metal-detection switch designed for industrial automation, featuring a DC 3-wire configuration with NPN or PNP output and a compact M4 × 25 (flush) design. With its 1 mm precise detection distance and durable nickel-plated brass housing, it is ideal for space-constrained industrial environments. The sensor includes an LED indicator for real-time detection feedback, making it easy to monitor and integrate into various automation systems. It complies with CE and RoHS certifications, ensuring high quality and environmental standards.

Product Specifications

ParameterDescription
ModelM3M4 (Flush)
Detection distance1 mm ± 10 %
Operating voltageDC 10 – 30 V
Output typeNPN / PNP (NO / NC optional)
Load current≤ 150 mA
Operating frequency1 kHz
Protection ratingIP65
Operating temperature−25 °C to +70 °C
Housing materialNickel-plated brass
Cable length2 m (customizable)
CertificationsCE · RoHS

Model Specifications — 8 Variants

ModelOutputDetectionMountDimensionsVoltageLoadResponseIPTemp.HousingCableCert.Notes
LJ4A3-1-Z/BYPNP NO1 mm ± 10 %FlushM4 × 25DC 10-30 V≤ 150 mA1000 HzIP67−25 °C ~ +70 °CStainless steel2 m PVCCE · RoHSStandard, high sensitivity
LJ4A3-1-Z/AXNPN NC1 mm ± 10 %FlushM4 × 25DC 10-30 V≤ 150 mA1000 HzIP67−25 °C ~ +70 °CStainless steel2 m PVCCE · RoHSHigh stability, harsh environments
LJ4A3-0.8-Z/BYPNP NO0.8 mm ± 10 %FlushM4 × 25DC 10-30 V≤ 100 mA500 HzIP67−25 °C ~ +70 °CNickel-plated brass2 m PVCCE · RoHSMicro detection, precision applications
LJ4A3-1-Z/EXDC 2-wire NO1 mm ± 10 %FlushM4 × 25DC 12-24 V≤ 150 mA1000 HzIP68−25 °C ~ +70 °CStainless steel2 m PVCCE · RoHSCustom voltage, multi-system compatible
LR04-01N1NPN NO1 mm ± 10 %FlushM4 × 25DC 10-30 V≤ 150 mA1000 HzIP67−25 °C ~ +70 °CStainless steel2 m PVCCEIndustrial grade, non-contact
LR04-01N2NPN NC1 mm ± 10 %FlushM4 × 25DC 10-30 V≤ 150 mA1000 HzIP67−25 °C ~ +70 °CStainless steel2 m PVCCECompact design, easy integration
EB-M4-NONPN NO0 – 2 mmFlushM4 × 25DC 12-24 V≤ 150 mA500 HzIP68−25 °C ~ +70 °CMetal cylindrical2 mCE · RoHSAuto-type, shielded / non-shielded optional
EB-M4-NCNPN NC0 – 2 mmFlushM4 × 25DC 12-24 V≤ 150 mA500 HzIP68−25 °C ~ +70 °CMetal cylindrical2 mCE · RoHSHigh response frequency, durable

Application Environments

The M3M4 proximity sensor is suitable for various industrial automation scenarios, including but not limited to:

With an IP65 protection rating, the sensor operates reliably in temperatures from −25 °C to +70 °C, suitable for harsh environments with moisture, dust or high temperatures.

Working Principle

The inductive proximity sensor generates an electromagnetic field from its front end. When a metal object enters this field, it alters the inductance of the sensor's coil. This change is detected by the internal circuit, which converts it into an electrical signal to trigger the switch output (normally open or normally closed).

The M3M4 sensor uses a DC 3-wire configuration (brown = power positive, blue = power negative, black = signal output), providing reliable signal feedback via NPN or PNP output. It detects metal targets without physical contact, offering high sensitivity and fast response for precision industrial applications.