Noike 6 Lamp Oil Cutoff Alarm Flow Meter Thermal Conductivity Type Flow Switch Nk300 Series

Product Overview:
Characteristics
       The unique tapered probe design prevents the entanglement of the windings in the media. Fully waterproof housing design, unique waterproof adjustment knob, can be adjusted freely without disassembling the sealing screw, convenient and more reliable. Applicable to a wide range of pipe diameters, free to adjust the set point, optional anti-corrosion type, withstand voltage up to 100Bar, the indicator light directly shows the flow, optional relay, analog output or analog switch output.

Principle, structure
        Thermally conductive flow switch, based on the thermal principle, contains two resistors in the enclosed probe, one of which is heated as the sense resistor and the other is not heated as the reference resistor. When the medium flows, the heat on the heating resistor is taken away. The resistance value is changed and the two resistance difference values are used as a basis for judging the flow rate. The probe adopts anti-fouling coating, which can effectively prevent dirt, rust and other dirt from adhering in the pipeline, and has stronger anti-pollution ability and more stable work.

Working principle 


       The NK300 series of thermally conductive flow switches are designed based on the principle of heat exchange. The probe has a built-in heating module and a heat sensing module. The heat conduction of the flow switch is closely related to the flow rate of the medium. When measuring, the heat is generated by the heating module. If there is no medium flowing in the pipe, the heat received by the heat sensing module is a fixed value. When there is medium flow, the heat received by the thermal module will change with the flow rate of the medium. The thermal module converts the temperature difference signal into an electrical signal, which is then converted by the processor into a corresponding standard analog signal or contact. Signal output, the flow switch uses this signal to display and control the flow rate of the medium.
 

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

Ordering Guide:
Structure Drawings:

Tips:Support OEM.

Optional accessories ---for connector type
Note: Relay products need to use 5-core connectors, the model is similar to 4-core connectors