Inductive Proximity Sensor, Ring Type, 21mm, M12

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$135.77

Competitive price ring type proximity sensor with 12mm diameter, direct lead wire/ M12 connector two lead wire types can be chosen, 10-36V operating voiltage. The ring inductive proximity sensor uses ABS plastic shell material, has a high response frequency of 500Hz, and an operating environment temperature range of -20 to 80℃, which is suitable for various industrial environments.

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SKU: ATO-RTPS-T21

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Delivery date: 6-12 days

Overview
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Inductive proximity sensor with 12mm diameter, NPN/ PNP/ 2 wire three output types, manufacturer direct sale. It is generally used to detect small objects, such as blanking detection, small steel balls, small springs, small rivets, metal wire breakage, wire breakage detection.

Features

The ring inductive proximity sensor provides a variety of sensing options to meet the needs of various industrial applications.
It supports cable connection or micro quick disconnect connectors, which is flexible in installation and easy to maintain.
Some models of inductive ring sensors have adjustable sensitivity.
The sensor supports reverse polarity, short circuit and overload protection to ensure safe and stable system operation.

Specification

Model			ATO-RTPS-41700	ATO-RTPS-41750
Lead wire types			Direct lead wire	M12 connector
Mounting			Embedded
Output methods	DC24V	NPN	NO
			NC
			NO+NC
		PNP	NO
			NC
			NO+NC
		2 wire	NO
			NC
	AC110V	2 wire	NO
			NC
	AC230V	2 wire	NO
			NC
Operating voltage		DC24V	10-36V
		AC110V/ AC230V	AC90-250V
Output current		DC24V	100mA (2 wire), 200mA(3/4 wire)
		AC110V	500mA
		AC230V	DC 100mA/ AC 300mA
Ring Diameter			21mm
Response frequency			500Hz
Environment temperature			-20~80℃
Insulation resistance			>20MΩ
Repeated accurancy			≤5%
Leak current			≤0.4mA(DC 2wire), ≤1.6mA(AC), ≤0.05mA (DC 3/4 wire)
Shell material			ABS
Protection grade			IP67
Weight			1kg
Certificates			CE, RoHS
Warranty			12 months

Dimension: (mm)

Dimension of 21mm ring type proximity sensor of direct lead wire

Wiring diagram

Wiring diagram of ring typr proximity sensor Wiring diagram of ring type proximity sensor

Tips: Application scenarios of ring inductive proximity sensors

The ring-type inductive proximity sensor is ideal for use in automated assembly lines, metal processing workshops, and material conveying systems. It detects metal objects—such as screws, nuts, steel balls, or rods—that pass through its central opening, enabling high-speed, non-contact counting or triggering. Compared to traditional photoelectric switches or mechanical limit switches, it offers greater precision and durability, especially in high-frequency and continuous-motion environments.

In practical applications, this sensor is often integrated with PLC controllers, pneumatic cylinders, and industrial conveyor systems to enable automated loading/unloading, part counting, or position feedback. For example, when a screw drops through the sensor’s detection zone via a feeder track, it instantly sends a signal to actuate a solenoid valve or transmit data to an HMI touchscreen, supporting fully automated and intelligent process control.

In this video, ATO will show you the differences between inductive and magnetic types.