φ4 Miniature Magnetic Proximity Sensor - NPN/PNP NO/NC (Smooth Barrel)
✨Features
Product Introduction
The phi 4mm Miniature Magnetic Sensor (NPN NO) is a specialized position detection solution for space-constrained applications. Unlike standard inductive sensors, this device detects magnetic fields (such as those from a piston magnet or an external NdFeB magnet), allowing it to detect targets from up to 10mm away despite its micro-sized housing.
The sensor features a robust Stainless Steel smooth barrel (non-threaded) for easy insertion into drilled holes. It comes pre-wired with a high-grade PUR cable, ensuring durability in oily or harsh environments. With an IP67 rating and a wide operating temperature of -25 C to +80 C, it is an excellent choice for cylinder position feedback, robotic end-effectors, and micro-mechanism monitoring.
Size and Structure
Circuit diagram
| Parameter | Specification |
|---|---|
| Product Type | Magnetic Proximity Sensor (Hall Effect) |
| Housing Structure | Cylindrical Smooth Barrel (Non-threaded) |
| Dimensions | Diameter 4 mm x Length 25 mm |
| Mounting | Flush (Embedded) |
| Sensing Distance (Sn) | 10 mm (Detected at N or S pole) |
| Standard Target | Magnet: Diameter 5 x 3 mm (NdFeB) |
| Output Type | NPN / PNP |
| Output State | NO / NC |
| Operating Voltage | 10 ... 30 VDC |
| Load Current | <= 200 mA |
| Current Consumption | <= 15 mA |
| Voltage Drop | <= 2 V |
| Switching Frequency | 1000 Hz |
| Hysteresis | 1 ... 15% (of Sr) |
| Repeat Accuracy | <= +/- 5% (of Sr) |
| Protection Circuit | Short-circuit, Reverse Polarity, Surge Protection |
| Connection | Cable 2m (PUR Material), Diameter 3.2mm |
| Housing Material | Stainless Steel |
| Sensing Face | PBT |
| Ambient Temperature | -25 C ... +80 C |
| Protection Degree | IP67 |
FAQ
Q：Can this sensor detect ordinary steel or iron directly like an inductive sensor?
A：No. This is a Magnetic Hall Effect Sensor, not an inductive sensor. It requires a specific magnetic field to trigger. You must mount the included (or compatible) NdFeB Magnet on your target object. It detects the presence of this magnet, not the metal itself. This allows for a much longer sensing range (10mm) compared to inductive sensors of the same size.
Q：The sensor body is smooth and has no threads. How do I mount it?
A：This sensor features a Smooth Barrel structure. It is designed to be inserted into a pre-drilled 4mm hole (tolerance H7 recommended) and secured using a set screw (grub screw), a split-clamp bracket, or industrial adhesive. This design is ideal for "embedded" installations in robotic fingers or small cylinders where external threads would increase the bulk.
Q：Is the cable suitable for moving parts or oily environments?
A：Yes. The sensor is equipped with a high-quality PUR (Polyurethane) cable. Unlike standard PVC cables, PUR is extremely resistant to abrasion, cutting fluids, and industrial oils. It also maintains flexibility for continuous motion applications, making it perfect for automation machinery and CNC equipment.
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