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Low price SN04-N metal object Non-contact detection proximity switch

SN04 is a very versatile square inductive proximity switch, commonly used in automation control, mechanical limit detection, and other scenarios. It mainly detects the presence of metal objects through the principle of electromagnetic induction.

Common application scenarios:
1. Travel limit: Installed at both ends of a lead screw guide rail to detect metal plates on the slider, preventing mechanical overtravel.
2. Counting detection: Detects the number of metal parts passing on an assembly line.
3. Position confirmation: Confirms whether the cylinder piston has reached a specified position (requires a magnetic ring or metal stop block, as the inductive type mainly detects metal stop blocks).

product details

Working Principle

The inductive proximity switch consists of a high-frequency oscillation circuit, a detection circuit, an amplification circuit, and an output circuit. At the front end of the sensor, there is an oscillation coil. When a metal object approaches this oscillation coil, eddy currents are generated inside the metal object. These eddy currents absorb the energy of the oscillation circuit, causing the oscillation to weaken until it stops. By detecting changes in the oscillation state, the detection and amplification circuits process the signal, and the output circuit then outputs the detection signal, thereby realizing the detection of metal objects.

Product Features

1. Square appearance, stable installation, no rotation Flat installation, narrow spaces
2. IP67 protection, oil-resistant, washable Suitable for food processing and machine tool coolant environments
3. Non-contact, no wear, long lifespan High-frequency counting, high-speed assembly lines
4. Wide voltage/protection, durable, not easy to break Suitable for sites with large power fluctuations and prone to wiring errors
5. Visualized, with LED light Equipment requiring quick debugging and maintenance

Product detail

Technical Specifications

Installation method				Unshielded
model	DC type	NPN	NO	SN04-N
			NC	SN04-N2
			NO+NC
		PNP	NO	SN04-P
			NO	SN04-P2
			NO+NC
		Two-wire	NO	SN04-D1
			NC	SN04-D2
	AC type	Two-wire	NO	SN04-Y1
			NC	SN04-Y2
		Three-wire	NO+NC
Detection distance				4mm ± 10%
Set distance				0—3.6mm
Lag distance				Less than 10% of the detection distance
Detecting objects				Magnetic metal (detection distance is reduced when non-magnetic metal)
Standard inspection object				Iron 18181mm
Response frequency				DC:0.5kHz AC:25Hz
voltage				DC type: DC12-24V (6-36V) pulsation (P-P) below 10%, AC type: AC110-220V (36-250V) 50/60Hz
Withstand voltage				AC1000V 50/60Hz 1min between the charging part and the outer casing
Voltage effect				Rated power supply voltage range within ±15%, rated power supply voltage value within ±10% detection distance
Current consumption				N.P type: 13 mA or less, D type: 0.8 mA or less, A type: 1.7 mA or less
Control output				N.P type: 300 mA or less, D type: 200 mA or less, A type: 400 mA or less
Loop protection				N.P.D type: reverse connection protection, surge absorption, load short circuit protection, type A: surge absorption
ambient temperature and humidity				During operation, when saving: each -30-+65 °C (no ice, no frost), during operation, when stored: each 35-95% RH
Temperature effect				Temperature range -30-+65°C, +23°C, ±15% detection distance Temperature range -25 - +60 ° C, +23 ° C, ± 10% detection distance
Insulation resistance				50MΩ or more (DC500 megohmmeter) between the charging part and the outer casing
Material				Housing: ABS detection surface: ABS
Protective structure				IP67 (IEC specification)