CMF37 Non-flush Type Capacitive Proximity Sensor Switch

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;

Application illustration

Model				CM37
Dimension
Sense distance				0~25mm±10%
Non-flush type	DC10~30VDC	NPN	NO	CM37-3025NA
			NC	CM37-3025NB
			NO+NC	CM37-3025NC
		PNP	NO	CM37-3025PA
			NC	CM37-3025PB
			NO+NC	CM37-3025PC
		Two-wire system	NO	CM37-3025LA
			NC	CM37-3025LB
	AC90~250VAC		NO	CM37-2025A
			NC	CM37-2025B
			NO+NC	CM37-2025C
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