working principle:
Based on the thermal principle, two resistors are included 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 heater is taken away. The resistance value is changed. Two resistance differences are used as the basis for determining the flow rate.
Features:
No moving parts, maintenance-free, easy to install, one model is suitable for a variety of pipe diameter requirements. The switch quantity is continuously adjustable, extremely low pressure loss, compact structure. LED shows flow trend and switch state.
Technical parameters:
Setting range: 1...150cm/s (water), 3...300cm/s (oil) 20...2000cm/s (air)
Signal output: PNP, NPN, relay, normally open + normally closed (SPDT)
Power supply: 24VDC ± 20%, 230VAC ± 15%
Switch-on current: max. 400 mA (PNP or NPN type) Max. 1A@48V ac/dc (relay type)
No-load current: up to 80mA
Flow indication: LED row (6)
Setting method: Potentiometer setting
Withstand voltage range: 100bar
Medium temperature change: ≤4°C/s
Response time: 1--13s, typical value 2s
Initialization time: about 8s
Electrical protection: reverse phase, short circuit, overload protection
Protection level: IP67
Medium temperature: Standard type: -20°C--80°C High temperature type: -20°C--150°C
Ambient temperature: -20--80°C
Storage temperature: -20--100 °C
Wiring method: M12 connector
Material: Probe: Stainless steel Housing: Stainless steel
Weight: about 0.4kg