FN3000-Flow Switch With LED Digital Display

Based on thermodynamic principle, FN3000 features 2 temperature sensors inside the probe: onefor medium temperature, the other one is heated a few degrees up compared to the mediuminto which it projects.When the medium flows, the heat generated in the sensor is conductedaway by the medium.The difference between these two sensors can be measured to get theflow rate.Compared to traditional products, FN3000 offers wider measuring range, lesstemperature drifting, as well as percentage or flow velocity display.All metal housing.highlighted digital LED, dual-key and user-friendly interface, multiple process connections.330° rotatable indicator.

Hydraulic /Lubrication

Pump protection

Cooling water monitoring

Ventilation system

Machinery manufacture

Water treatment


  1. 4-digit LEDs

  2. Flow velocity/percentage display

  3. Wide measuring range

  4. Measuring span programmable

  5. PNP / NPN programmable

  6. Rotatable indicator, easy to read, robust display


Specification Table

Order No

Measuring range
Water1…200cm/s(The default display value is calibrated with water, other media need to be specified)
Measuring mediumWater, oil, gas and other media compatible with stainless steel
Repeatability1%@<0.6m/s; 3%@<1.5m/s; 10%@>1.5m/s
Withstand voltage100bar
Initialization time1…8s
Response timeTypical value2s.
Supply voltage18...30Vdc
No-load current consumption≤500mA,exist24VdcWhen power supply
Switch output
Output typePush-pull (compatible withPNPandNPN), normally open and normally closed can be set
S1,S2Output current<500mA
Current mode analog output
Output classtypeThird line0...20mA/4...20mACan be set
Wiring protectionReverse phase, overload, short circuit protection
DesignRed4 bit8mm high brightnessled
Display range-1999…9999
Operating temperature-40…85℃
Medium temperature-20…85℃
ShellStainless steel304
ProbeStainless steel304
Degree of protectionIP67
Outgoing wayM12×1Connector
Product order No. Probe rod L
Process connection  
FN3000 27 G1/4  
FN3001 27 G1/2  
FN3002 60 M18 connector