?Thermal conductivity type flow switch (explosion-proof type) FR12B-600EX type Principle and structure
NK-600E series thermal conductivity type flow switch, based on the thermal principle, contains two resistors in a closed probe, one of which is heated as the detection resistor, the other is not heated as the reference resistor, when the medium flows, the heating resistor The heat 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. The probe adopts anti-scaling coating, which can effectively prevent the adhesion of scale, rust and other dirt in the pipeline, with stronger anti-fouling ability and more stable work.
?Thermal conductivity type flow switch (explosion-proof type) FR12B-600EX type Features
The unique conical probe design can effectively prevent entanglement in the medium. Fully waterproof shell design, unique waterproof adjustment knob, no need to remove the sealing screw, you can adjust arbitrarily, convenient and reliable. Applicable pipe diameter range is large, set point can be adjusted at will, anti-corrosion type is optional, withstand voltage up to 100Bar, indicator light directly displays flow, optional relay, analog output or analog switch integrated output.
The NK-600E series thermal conductivity type flow switch can monitor the liquid flow in the pipeline in real time. There are no moving parts, maintenance-free, and easy to install. One model is used for a variety of pipe diameter requirements, providing switch output, and adopts 6 LEDs display the fluid flow rate status in real time, and realize the following monitoring functions: medium flow, reduce/increase the flow rate; medium presence/absence; medium flow/static; monitor the fluid flow rate in the pipeline, cut-off monitoring or prevent the pump from idling. It is widely used in petrochemical, electric power, metallurgy, steel mills, papermaking, food processing, water treatment, battery factories and other industries. Gas-liquid dual-purpose type, can be used in pneumatic and hydraulic systems, can be used for circulating water, cutting fluid and lubricating oil cut-off monitoring, and pump idling protection.
?Thermal conductivity type flow switch (explosion-proof type) FR12B-600EX technical parameters
Setting range: 1…150cm/s (water), 3…300cm/s (oil), 20…2000 (air)
Signal output: PNP, NPN, relay, 1) normally open + normally closed (SPDT)
Power supply: 24V±20%DC2)
Power on: Maximum 400mA (PNP or NPN type) Maximum 1A48VAC/DC (relay type)
No-load current: Max 80mA
Flow indicator: LED row (6)
Setting method: potentiometer setting
Pressure range: 100bar
Medium temperature change: ≤4℃/s
Response time: 1...13s, typical value 2s
Initialization time: about 8s
Electrical protection: reverse phase, short circuit, overload protection
Explosion-proof grade: ExdII CT6
Protection level: IP67
Medium temperature: -20…100℃
Ambient temperature: -20…80℃
Storage temperature: -20…100℃
Wiring mode: M12 connector
Material quality: Probe: Stainless steel Case: Stainless steel
Repeatability: ±2%
?Thermal conductivity type flow switch (explosion-proof type) FR12B-600EX type wiring diagram
?Thermal conductivity type flow switch (explosion-proof type) FR12B-600EX type Dimensional drawing
Small explosion-proof thermal conductivity type flow switch with indicator light FR12B-600EX
?Thermal conductivity type flow switch (explosion-proof type) FR12B-600EX type LED function and setting (switch quantity type)
Install the flow switch so that the medium flows at the flow rate that needs to be monitored, and adjust the potentiometer so that the first green LED just turns on. After that, when the flow rate is lower than the current value, the switch is released. To make the switch point smaller than the current flow rate, adjust the potentiometer to make the green LED brighter.
Small explosion-proof thermal conductivity type flow switch with indicator light FR12B-600EX
?Thermal conductivity type flow switch (explosion-proof type) FR12B-600EX type LED function and setting (analog type)
The analog output type flow sensor, the output is 4middot;middot;middot;20mA, which is proportional to the flow rate, and the output is non-linear. Each sensor has two knobs, one is quot;upper limit (20mA)quot; and the other is quot;lower limit (4mA)quot; for output setting.
Small explosion-proof thermal conductivity type flow switch with indicator light FR12B-600EX
Install the flow sensor to make the medium flow at the lower limit flow rate to be detected. Adjust the lower limit knob to make the fourth green LED light (20mA). After that, the output will be proportional to the flow rate between the static and the upper limit, that is, 4mA corresponds to the static flow rate. , 20mA corresponds to the upper limit flow rate.
?Thermal conductivity type flow switch (explosion-proof type) FR12B-600EX type Working principle
The EX-600 series thermal conductivity flow switch is designed based on the principle of heat exchange. The probe has a built-in heating module and a thermal module. The heat conduction of the flow switch is closely related to the flow rate of the medium. During measurement, the heating module emits heat. If there is no medium flowing in the pipeline, the heat received by the thermal module is a fixed value. When the medium is flowing, 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, and then the processor converts it 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.
Small explosion-proof thermal conductivity type flow switch with indicator light FR12B-600EX
?Thermal conductivity type flow switch (explosion-proof type) FR12B-600EX precautions for use
After receiving the product, please check whether the packaging and appearance are intact, and check whether the model and specifications are consistent with the product you purchased.
Be sure to check whether the power supply voltage is correct and the wiring is correct before powering on. The company does not guarantee the product burned out or the load product damaged due to continuous errors.
Do not install live!
During the installation process, use a hexagonal wrench and do not forcefully install or disassemble. Otherwise it is easy to damage the product, especially in accordance with the thread and shell.
If there is an abnormal phenomenon, unless you have product adjustment equipment and skills, please contact our after-sales technicians for the product.
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