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Electronic flow sensor (Thermal differential type)
Principle Based on the principle of thermal theory, there are two resistances in the closed probe . One resistance was heated and regarded as detected resistance , the other one was heated and regarded as standard resistance . When the medium is flowing ,the heat on the heated resistance will be taken away and the resistances’ value will be changed . The differential resistances value is the basis of determining the flow velocity .
Feature1,No movable parts . 2, Maintenance free. 3,Easy installation. 4,Suitable for variable diameter demand . 5, Switching value can be adjusted continuously. 6,Extremely low pressure loss . 7,Compact structure . 8, LED indicator display flow trend and switch state .
Technical data Set range:1…150cm/s( water),3…300cm/s(oil),20…2000cm/s(air)Output: PNP, NPN, Relay ,4-20mA, NO+NC (SPDT)Power supply :24V±20%DC or 230V±15%ACSwitching Current : Max.400mA(PNP or NPN type ), Max.4A( Relay type )Unload current: Max.80mAFlow indicator : LED (6)Set type :potentiometer setProof Pressure range: 100barTemperature gradient: 4°C/s Response time :1--13s,standard is 2sInitialization time : 8sElectrical protection: reversed-phase , short circuit ,overload protectionProtection class: IP67Medium temperature :-20--80°CEnvironment temperature :-20--80°CStorage temperature :-20--100°CConnection :M12 connector /2m cable (option)Material: Probe is stainless steel . Housing is PBT .Weight :0.4kg