LJ24A3 Inductive Proximity Switch Sensor for Distance detection
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
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- Fast response speed, able to quickly detect the approach of metal objects.
- Strong and compact structure, high protection rating, capable of stable operation in harsh environments.
- Features a large sensing range and high detection efficiency.
Main applications include:
- Industrial automation: used to detect the position of robotic arms, the arrival signal of metal workpieces on production lines, etc.
- Machine tool control: can achieve tool positioning, travel limit functions, etc., improving machining accuracy.
- Logistics sorting: detects metal packaging or pallets on conveyor belts, coordinating with PLCs for automatic sorting.
- Elevators and automatic doors: detects door position to ensure safe operation.
Product detail
Technical Specifications
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installation method |
Shielded |
Unshielded |
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model |
DC type |
NPN |
NO |
LJ24A3-8-Z/BX |
LJ24A3-10-Z/BX |
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NC |
LJ24A3-8-Z/AX |
LJ24A3-10-Z/AX |
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NO+NC |
LJ24A3-8-Z/CX |
LJ24A3-10-Z/CX |
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PNP |
NO |
LJ24A3-8-Z/BY |
LJ24A3-10-Z/BY |
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NC |
LJ24A3-8-Z/AY |
LJ24A3-10-Z/AY |
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NO+NC |
LJ24A3-8-Z/CY |
LJ24A3-10-Z/CY |
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Two-wire |
NO |
LJ24A3-8-Z/EX |
LJ24A3-10-Z/EX |
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NC |
LJ24A3-8-Z/DX |
LJ24A3-10-Z/DX |
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AC type |
Two-wire |
NO |
LJ24A3-8-J/EZ |
LJ24A3-10-J/EZ |
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NC |
LJ24A3-8-J/DZ |
LJ24A3-10-J/DZ |
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Three-wire |
NO+NC |
LJ24A3-8-J/EDZ |
LJ24A3-10-J/EDZ |
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Detection distance |
8mm ± 10% |
10mm ± 10% |
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Set distance |
0—7mm |
0—8mm |
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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 24*24*1mm |
Iron 30*30*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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