PF2A Digital flow switch with display.

PF2A Digital flow switch. For air, nitrogen, argon and neutral gases. Flow rates up to 12000 l/min

PF2A Digital flow switch. For air, nitrogen, argon and neutral gases. Flow rates up to 12000 l/min
Measuring principle thermal hot wire
Range 1÷12000 l/min depending on the diameter
Output signal 4÷20 mA - 1÷5V - NPN - PNP
Process connection by 1/4" to 2"
Materials body PBT - PBT sensor - stainless steel mesh -iInterface in PBT
Temperature up to 50°C - Pressure up to 15 bar depending on the diameter
Price from € 200,00 a 375,00
Variable depending on the configuration

Detection of digital flow switch for air.
A heated thermistor is placed in the passage. The fluid introduced absorbs heat from the thermistor, the resistance of the thermistor increases with decreasing temperature. Since the resistance value has a uniform relationship with the speed of the fluid, this can be detected by measuring the resistance value.
To further compensate for the ambient temperature and the temperature of the fluid, the temperature sensor consists of a sensor integrated in the switch that allows a stable measurement within the range of the operating temperature.

The detection of the flow value is calculated on the mass of the same, as it is practically insensitive to variations in temperature and pressure. The sensors employ a unit of measurement l / min, calculated by substituting the volume of the flow with the mass under the conditions of 0C and 101.3 kPa (nor). The melt volume flow rate of 20C, 101.3 kPa and 65% RH (ANR) can be detected with the flow at high flow rates for air.

This flowswitch uses l / min as the flow rate indicator. The flow rate of the mass is converted and shown in the display in the conditions of 0 ° C and 101.3 kPa.
In sensors for high capacities, the conditions of the conversion can be changed to 20 ° C and 101.3.3kPa.


  • Setting and flow measuring directly on the digital display integrated
  • Available in two versions: integrated and removable
  • Transition from instantaneous flow in integrated flow
  • Ability to set two course independent

Technical Characteristics

Measuring principle:
    • Thermal mass
    Measuring range / adjustment:
      • 1÷12'000 [l/min]
        [depending on the diameter]
      Precision Class:
        • ±1% VFS
        Outputs available:
          • 1÷5 [V]
          • 4÷20 [mA]
          • NPN
          • PNP
          Operating voltage [V]:
            • 12÷24 Vdc
            Operating temperature:
              • 0÷+50 [°C]
              Pressure max:
                • 15 [Bar]
                Process connection:
                  • Threaded: 1/8" | 1/4" | 3/8" | 1/2" | 1" | 1"1/2 | 2"
                  Materials in contact with the media:
                    • PBT
                    • Stainless steel AISI 304
                    Degree of protection:
                      • IP65
                        • EC Declaration of Conformity