LJ12A3 Assembly line counting inductive proximity sensor for metal
Working Principle
The cylindrical inductive proximity switch contains a coil inside. When powered, the coil generates an alternating magnetic field. When a metal object approaches this magnetic field, eddy currents are induced within the object. The generation of eddy currents consumes energy, causing a change in the inductance of the coil. The switch's internal oscillation circuit continuously monitors changes in inductance, and when the change reaches a preset threshold, the switch changes its output state, thereby detecting the approach of the metal object.
Difference between capacitive proximity switch and inductive proximity switch: Capacitive can detect both metal and non-metal (liquids, powders, etc.) but is easily affected by environmental humidity; inductive only detects metal and has stronger anti-interference capability.
Product Features
- 1. Non-contact detection: No mechanical wear, long service life, high reliability.
2. Detects only metal: Can only sense metal objects (iron, copper, aluminum, etc.) and does not respond to non-metals (plastic, wood, water, etc.).
Note: Different metals affect the detection distance; usually, iron has the longest detection distance, while non-ferrous metals (such as copper and aluminum) are slightly shorter.
3. Strong environmental adaptability: Usually has a high protection rating (e.g., IP67) and can withstand harsh industrial environments such as oil, dust, and vibration.
4. High response frequency: Fast action speed, suitable for high-speed counting or detection of fast-moving objects.
5. Easy installation: Compact structure, easy to adjust and integrate.
Product detail
Technical Specifications
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installation method |
Shielded |
Unshielded |
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model |
DC type |
NPN |
NO |
LJ12A3-2-Z/BX |
LJ12A3-4-Z/BX |
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NC |
LJ12A3-2-Z/AX |
LJ12A3-4-Z/AX |
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NO+NC |
LJ12A3-2-Z/CX |
LJ12A3-4-Z/CX |
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PNP |
NO |
LJ12A3-2-Z/BY |
LJ12A3-4-Z/BY |
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NC |
LJ12A3-2-Z/AY |
LJ12A3-4-Z/AY |
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NO+NC |
LJ12A3-2-Z/CY |
LJ12A3-4-Z/CY |
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Two-wire |
NO |
LJ12A3-2-Z/EX |
LJ12A3-4-Z/EX |
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NC |
LJ12A3-2-Z/DX |
LJ12A3-4-Z/DX |
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AC type |
Two-wire |
NO |
LJ12A3-2-J/EZ |
LJ12A3-4-J/EZ |
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NC |
LJ12A3-2-J/DZ |
LJ12A3-4-J/DZ |
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Three-wire |
NO+NC |
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Detection distance |
2mm ± 10% |
4mm ± 10% |
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Set distance |
0—1.6mm |
0—3.6mm |
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Lag distance |
Less than 10% of the detection distance |
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Detecting objects |
Magnetic metal (detection distance is reduced when non-magnetic metal) |
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Standard inspection object |
Iron 12*12*1mm |
Iron 15*12*1mm |
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Response frequency |
DC:0.5kHz AC:25Hz |
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voltage |
DC type: DC12-24V (6-36V) pulsation (P-P) below 10%, AC type: AC110-220V (36-250V) 50/60Hz |
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Withstand voltage |
AC1000V 50/60Hz 1min between the charging part and the outer casing |
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Voltage effect |
Rated power supply voltage range within ±15%, rated power supply voltage value within ±10% detection distance |
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Current consumption |
N.P type: 13 mA or less, D type: 0.8 mA or less, A type: 1.7 mA or less |
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Control output |
N.P type: 300 mA or less, D type: 200 mA or less, A type: 400 mA or less |
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Loop protection |
N.P.D type: reverse connection protection, surge absorption, load short circuit protection, type A: surge absorption |
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Ambient temperature and humidity |
During operation, when saving: each -30-+65 °C (no ice, no frost), during operation, when stored: each 35-95% RH |
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Temperature effect |
Temperature range -30-+65°C, +23°C, ±15% detection distance Temperature range -25 - +60 ° C, +23 ° C, ± 10% detection distance |
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Insulation resistance |
50MΩ or more (DC500 megohmmeter) between the charging part and the outer casing |
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Material |
Housing: Brass nickel plated Detection surface: ABS |
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Protective structure |
IP67 (IEC specification) |
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