The capacitive proximity switch is a sensor switch for non-contact detection. Its diameter is 24 mm and has two output modes: NO (normally open) and NC (normally closed).
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.
| Structural category | Object | Inductive surface | RC oscillator | Switching stage | Magnified output stage |
| Outward appearance illustration |  |
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| 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 |
| Structural category | Capacitance proximity switch | |||
| Outward Appearance code | CM24 | |||
| Outward appearance illustration |  |
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| Overall dimensions |  |
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| DETECTION DISTANCE | 0-8mm | |||
| Flush | DC 6-36 VDC AC 90-250 VAC |
NPN | NO | CM24-3008NA |
| NC | CM24-3008NB | |||
| NO+NC | CM24-3008NC | |||
| PNP | NO | CM24-3008PA | ||
| NC | CM24-3008PB | |||
| NO+NC | CM24-3008PC | |||
| SCR Controllable silicon |
NO | CM24-2008A | ||
| NC | CM24-2008B | |||
| DETECTION DISTANCE | 0-12mm | |||
| Non-Flush | DC 6-36 VDC AC 90-250 VAC |
NPN | NO | CM24-3012NA |
| NC | CM24-3012NB | |||
| NO+NC | CM24-3012NC | |||
| PNP | NO | CM24-3012PA | ||
| NC | CM24-3012PB | |||
| NO+NC | CM24-3012PC | |||
| SCR Controllable silicon |
NO | CM24-2012A | ||
| NC | CM24-2012B | |||
| Detectable object | conductor and dielectric body | |||
| Consumption current | DC＜15mA、AC＜10mA | |||
| Output current | DC: 200mA, AC: 300mA | |||
| Output voltage drop DC/AC | DC＜3V、AC＜7V | |||
| DC/AC Response frequency | DC: 50Hz, AC: 10Hz | |||
| Shell material | Metal | |||
| Working environment temperature | -25℃~70℃ | |||
| Insulation resistance | 50MΩ | |||
| Protection grade | IEC standard IP54 | |||
| Alyemative model at home and abroad | LJC24A3-□□ | |||
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