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CM12 Capactive Proximity Switch

CM12 Capacitive Proximity Switch utilizes the blocking, covering, or reflecting of the light beam between the light source and the photosensitive device to achieve detection of objects. 

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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 CM12
Dimension
Sense distance 0~2mm±10%
Flush type DC10~30VDC NPN NO CM12-3002NA
NC CM12-3002NB
NO+NC CM12-3002NC
PNP NO CM12-3002PA
NC CM12-3002PB
NO+NC CM12-3002PC
Two-wire system NO CM12-3002LA
NC CM12-3002LB
AC90~250VAC NO CM12-2002A
NC CM12-2002B
NO+NC CM12-2002C
Sense distance 0~4mm±10%
Non-flush type DC10~30VDC NPN NO CM12-3004NA
NC CM12-3004NB
NO+NC CM12-3004NC
PNP NO CM12-3004PA
NC CM12-3004PB
NO+NC CM12-3004PC
Two-wire system NO CM12-3004LA
NC CM12-3004LB
AC90~250VAC NO CM12-2004A
NC CM12-2004B
NO+NC CM12-2004C
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 0.01
Response frequency DC50Hz/AC10Hz
Ambient temperature -25℃-+75℃
Insulation resistance 50MΩ
Shell material Metal
Protection grade IP54

 

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