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CM12 M12 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

Introduction

○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.


Feature

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


Application

 ●Liquid level measurement-plastic or glass container

 ●Material level measurement

 ●Checking for broken board

 ●Count the bottles

 ●Detect the tightness of conveyor belt

 ●Counter and detect the material level


Working Principle

xx.1


Outward Appearance

xx.0

Technical Parameter

  DETECTION DISTANCE 0-2mm


Flush

DC
6-
36
VDC
 

AC
90-
250
VAC
NPN NO CM12-3002NA
NC CM12-3002NB
NO+NC CM12-3002NC
PNP NO CM12-3002PA
NC CM12-3002PB
NO+NC CM12-3002PC
SCR
Control-
lable
silicon
NO CM12-2002A
NC CM12-2002B
DETECTION DISTANCE 0-4mm

Non-flush

DC
6-
36
VDC
 
AC
90-
250
VAC
NPN NO CM12-3004NA
NC CM12-3004NB
NO+NC CM12-3004NC
PNP NO CM12-3004PA
NC CM12-3004PB
NO+NC CM12-3004PC
SCR
Control-
lable
silicon
NO CM12-2004A
NC CM12-2004B

 

Detectable object' conductor and dielectric body
Consumption current DC< 15mA\AC< 10mA
Control output DC: 200mA, AC: 300mA
Output voltagc drop DC/AC   DC< 3V\AC< 7V
DC/AC Response frequency DC: 50Hz, AC: 10Hz
Shell material Metal
Working environment temperature -25~70º C
Insulation resistance 50MΩ
Protection structure IECstandard lp54

Dimension

M12.png


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

 


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