CM20 Capactive Proximity Switch

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.

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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 CM20
Dimension
Sense distance 0~10mm±10%
Non-flush type DC10~30VDC NPN NO CM20-3010NA
NC CM20-3010NB
NO+NC CM20-3010NC
PNP NO CM20-3010PA
NC CM20-3010PB
NO+NC CM20-3010PC
Two-wire system NO CM20-3010LA
NC CM20-3010LB
AC90~250VAC NO CM20-2010A
NC CM20-2010B
NO+NC CM20-2010C
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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