Electronic flow switch NK300A series

Principle Characteristic

Based on the thermal principle, the enclosed probe contains tw

Based on the thermal principle, the enclosed probe contains two resistors, one of which is heated as the detection resistance and the other is not heated as the reference resistance. When the medium flows, the heat on the heating resistance is taken away, the resistance value is changed, and the difference between the two resistances is used as the basis for judging the flow rate.

Product Application

Gas-liquid dual type is used for pneumatic and hydraulic systems, can be used for circulating water, cutting fluid and lubricating oil flow detection, and pump idling protection.

Technical Parameters

*Set the range： 1...150cm/s(water），3...300cm/s(oil），20...2000cm/s(air）

*Signal output： PNP,NPN，relay，Normally open + normally closed（SPDT）

*The power supply： 24V±20%VDC or 230V±15%VAC

*Current is switched on：Maximum 400mA(PNP or NPN), maximum 4A (relay)*

*No-load current： Maximum 80mA

*Flow indicator： LED row (6)

*Set way： Potentiometer setting

*Pressure range： 100bar

*The temperature gradient：≤4°C/s

*The response time： 1-13s,Typical values 2s

*Initialization time： 8s

*Electric protection：Invert, short circuit

Overload protection

*Protection grade： IP67

*Medium temperature：-20...80°C

*The environment temperature：-20...80°C

*Storage temperature： -20...100°C

*Connection mode：M12 plug-in/direct attachment line

*Material：

           probe： Stainless steel

           shell： PBT

           weight： 0.4kg

The wiring diagram

Size chart（mm）

Installation drawing

Optional accessories - electrical accessories