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CM20 M20 capacitance proximity switch sensor

1,Capacitive proximity sensor
2,CE Certification
3,Flush and UNflush type
4,Output state:NO,NC,NO+NC
5,PNP and NPN
  • CM20
  • YUMO
  • YM556423


○The mechanical quantity to be measured, such as displacement, pressure change into an electrical capacitance sensor.

Therefore, capacitive sensors can be divided into pole pitch change type, area change type, change the media type categories. Pole pitch change type is generally used to measure the tiny lines or due to force displacement, pressure, vibration caused by the pole pitch changes (see capacitive pressure sensor). Area change type is generally used to measure the angular displacement or larger linear displacement. Change media type commonly used in level measurement and a variety of medium temperature, density determination and humidity.

○The induction surface of capacitance sensor is composed of two coaxial mental electctrodes, which from a capacitor and connected on RC oscillation circuit, just like an open capacitor electrode.

○When connecting to power supply, RC oscillator does not work. When an object is clos eto capacitor

electrode, the capacitor capacity will increase, and the oscillator will vibrate. Through the treatment of behind stage circuit, both signals of stop oscillation and oscillation will be converted to switch signs for checking the existence of object. this distance can be obtained, but to nonmetal object, the action distance is d etermined by material dielectric constant, the more dielectric constant, the more action distance will be obtained.


1. Compact volume,  High on-off frequency

2. Good performance of anti-interference

3. Many output forms,  Wide voltage range

4. Dust proof, vibration proof, water proof and oil proof

5. connecting protection

6. Long service life

Working Principle


Outward Appearance


Technical Parameter

                                                                          Non-flush                                                                                                                                Detection distance
DC6-36V NPN NO CM20-3010NA
NC CM20-3010NB
NO+NC CM20-3010NC
PNP NO CM20-3010PA
NC CM20- 3010PB
NO+NC CM20- 3010PC
AC90-250V SRC Control label silicon NO
Control output DC 200mA
SCR/Relay 300mA
Detect object conductor and dielectric body
Consumption current DC<15mA AC<10mA
Output current DC:200mA   AC:300mA
Output voltage drop DC<3V  AC<7V
Response frequency DC:50HZ  AC:10HZ
Shell material Resin/Metal
Working environment temperature below 25C to 70C
Insulation resistance 50MΩ
Shell meterial Metal
Protection grade IEC standard IP54





Application Illustration       



The dielectric constants for some important materials are as:

Materials Dielectric constant Materials Dielectric constant Materials Dielectric constant Materials Dielectric constant
Synthectic resin adhesive 3.6 Styrence 3 Alcohol 25.8 Polyvinyl 2.9
Mica 6 Prorcelain 4.4 Glass 5 Quartz glass 3.7
Ebonite 4 Petrolin 2.2 Cardboard 4.5 Silicon 2.8
Marble 8 Quartz sand 4.5 Cable rubber compound 2.5

Paper 2.3 Soft rubber 2.5 Gasoline 2.2

Organic glass 3.2 Water 80 Wood 2.7