FS5021 Transmitter for Air Flow and Volume Flow + Temperature for Air Conducts (output 0-10V or 4-20mA)

Fuehler Systeme


  • 0-20 m/s, 0...+50°C, 0-200.000 m³/h
  • 0-10 V, 4-20 mA
  • LCD display, relay
  • 5 scales per device

218,00 €

Add to wishlist

The Sensor measures: Air Flow and Volume Flow
Output Signal: 0-10 V or 4-20 mA
Power Supply: 24 Vdc
Sensor for use in: Indoor

The flow transmitter FS5021 detects the air flow, volume flow and temperature in ventilation ducts. The transmitter converts the measurement result into a linear output signal 0-10 V or 4-20 mA for further processing.
As an option, a potential-free changeover contact and / or a backlit LCD display are available.
In the case of display devices, the DIP switch can be used to switch to volumetric flow. For this, the channel cross-section, channel geometry and immersion depth must be specified in the menu. The volume flow is then calculated from the flow velocity.
The content of the backlit display can be rotated by the menu in 90 ° increments. The actual value, the set switching threshold, the relay status, the MIN / MAX measured values ​​of the selected interval, etc. can be read off.
The airflow sensor works according to the calorimetric measuring principle and has 5 freely selectable scalings, which can simply be switched over as required by innovative DIP-switch technology.
In addition, the switching threshold, hysteresis etc. can be specified.


calorimetric measuring method


0-20 m/s


0-3 m/s, 0-5 m/s, 0-10 m/s, 0-15 m/s, 0-20 m/s


0-200.000 m³/h (calculated)

Measurement range temp.



±0,3 m/s + max. ±4% FS (@ 20°C, 45% r.H., 1013 mbar), ±0,5 K (@ 20°C, > 1 m/s)

Temperature dependency

±1% FS / 10 K

Long term stability

±1% FS/year, ±0,2 K/year

Response time (t90)

> 4 s @ 10 m/s

Running-in time

< 30 s at initial operation because of tempering

Output attentuation

5 s

Supply voltage

24 V AC/DC

Current consumption at 0-10 V

Ø 100 mA

Current consumption at 4-20 mA

< 140 mA

Current consumption at relay

< 120 mA

Analogue output 0-10 V

3-wire connection, min. load resistance 100 kOhm

Analogue output 4-20 mA

3-wire connection, max. RLoad(Ohm) = 300 Ohm

Alarm output

1 x potential-free change-over contact, 48 V, 1 A


5% Span, adjustable with display devices

Electrical connection

screw terminals max. 1,5 mm²


Polycarbonate PC UL 94 V0 with hinge locks, color signal white similar to RAL 9003

Cable gland

PG11 high-strength cable gland with strain relief


optional 2-line LCD-Display, to display the measured values on location


Protection tube: stainless steel VA 1.4571

Protection type

Housing/electronic: IP65, Sensor: IP30

Protection class


Working range

0,3-20 m/s

Working temperature


Storage temperature



mounting flange (in scope of delivery)



30 other products in the same category: