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CM35 Capactive Proximity Switch

With a sensing range of 0-25mm, the CM35 Capacitive Proximity Switch offers a wide detection range, making it suitable for various industrial automation applications. It provides accurate and consistent detection capabilities, ensuring efficient and precise operation in assembly lines, packaging systems, robotics, and other industrial processes.

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Capactive Proximity Switch

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.

 

 

Working principle of Capactive Proximity Switch

 

Structural category Object Inductive surface RC oscillator Switching stage Magnified output stage
Outward appearance illustration

 

 

Outward appearance illustration

 

 

 

The dielectric constants foe some important materials are as; osted as below;

 

Materials Dielectric constant Materials Dielectric constant Materials Dielectric constant Materials Dielectric constant
Synthectic resin adhesive 3.6 Styrene 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    

 

 

Application illustration

 

 

Model CM35
Dimension
Sense distance 0~25mm±10%
Non-flush type DC10~30VDC NPN NO CM35-3025NA
NC CM35-3025NB
NO+NC CM35-3025NC
PNP NO CM35-3025PA
NC CM35-3025PB
NO+NC CM35-3025PC
Two-wire system NO CM35-3025LA
NC CM35-3025LB
AC90~250VAC NO CM35-2025A
NC CM35-2025B
NO+NC CM35-2025C
Output current DC 200mA
AC 300mA
Output voltage peak Dc type below 3V, Ac type below 7V DC<3V, AC<7V
Consumption current DC type 8mA at 12V, 15mA at 24V, AC below 10mA DC<15mA, AC<10mA
Standard detected object Conductors and dielectric materials
Repeatability 0.05
Response frequency DC50Hz/AC10Hz
Ambient temperature -25℃-+75℃
Insulation resistance 50MΩ
Shell material ABS Resin
Protection grade IP54

 

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