Your position: Home / Sensor

inductive proximity sensor (cylindrical)

40*40*52mm Non-flush Square type inductance sensor SN20 2-wire, 3-wire NO / NC square sensor switch
  • sensor:
(999 available)
Please select the information you wantX
  • Description
  • Reviews

Ordering Guide:  Please notice the model when you make order, chheck model and specification below please.

SN20-N1: 3-wire, NPN, NO 

SN20-N2: 3-wire, NPN, NC

SN20-P1: 3-wire, PNP, NO 

SN20-P2: 3-wire, PNP, NC 

SN20-D1: 2-wire, NO

SN20-D2: 2-wire, NC


If you don't make any otice, we will send SN20-N1 as alway!! Thank you for your understanding :-)

HEYI Electrical Co., LTD. is a comprehensive multi-business industry and trade integration of high-tech enterprises.

We own one strong R&D and QC team continues to innovate new solutions for customers.


 Product Description                                                                                                                                                                                                                     

Proximity switch is a mechanical moving parts and without direct contact with the position of the switch can be operated.


 Product Data                                                                                                                                                                                                                                  

Model NPN SN20-N
DC 2-wire SN20-D
AC 2-wire SN20-A
Dimentions (mm)


Mounting Non-flush
Standard test object Iron 40*40*1
Sensingrange Sn(mm)±10% 20mm
Set Distance(mm) 0-16mm
Hysteresis Set Distance <10%
Answer frequency DC 200Hz, AC 20Hz
Power supply DC12-24V(Voltage range:5-35V), AC90-250V
Control output Max:DC 2-wire 100mA, Dc 3-wire 300mA, AC 2-wire 400mA(Load resistance)
Action indication RED LED
Type of protection polarity protection / overcurrent /Short- circuit protection 
Temperature (-)25 to 70 ºC
 Humidity 35-85%RH
Insulation resistance >500MΩ 
Standard IP67

 Note: 1-NO; 2-NC. Please add the number when you choose the model, such as SN20-N1.



1) Power source reversal connection protection (DC); Surge protection ; 2) Long life and high reliability; 3) High

performance-price ratio; Easy operation; 4) Non-flush and Flush type; 5) Nickel-plated copper tube, high temperature-

resistant plastic detection head (PPT); 6) 2m cable output; 7) Metal detection; 8) Red LED indication


 Wiring Diagram                                                                                                                                                                                                                             

Wiring diagram.png


Application display.jpg


1) Do not use the sensor in water, rain, or outdoors.

2) To maintain operational reliability and service life, use the sensor only within the specificed temperature range.

3) The sensor has a water resistant structure, however, attaching a cover to prevent direct contact with water will help

improve reliability and prolong product life.

4) Avoid using the sensor where there are chemical vapors, especially strong alkails or acids (nitric acid, chromic acid,

or hot concentrated sulfuric acid).


 Delivery (Global courier, Ocean transpor, Air transport)                                                                                                                                                                                                                                                                             


 Our Commitment                                                                                                                                                                                                                           


  • BETTER PRICE than other sellers for you because of Factory Direct Sale.
  • BETTER QUALITY than before caused by our 10+ years trading experience.
  • STOCK IN TRADE always own to our Fast & Professional production line.
  • FAST DELIVERY always made by our GROUP's Enthusiam.
  • TIMING REPLY in 24 hours all about our TEAM's Passion & Patience. 


 Contact us:                                                                                                                                                                                                                                                                                                          

Send your Inquiry Details in the Below, Click "Send" Now~


Average rating:
Share your thoughts with other customers
Write a review