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High-Precision Air/ Gas Velocity Transmitter for Industrial Applications

The FF86 series air velocity transmitters were developed to obtain accurate measuring results over a wide range of velocities and temperature. High-quality hot film sensor elements based on cutting-edge thin film technology ensure maximum sensitivity, even at lowest mass flows. At the same time, the innovative probe design produces reliable measuring results at high flow velocities of up to 40m/s (8000ft/min).

The integrated temperature compensation minimizes the temperature cross-sensitivity of the FF86 series which, combined with the robust mechanical design, allows it to be used at process temperatures between-40 to 120°C (-40 to 248°f).

In addition to air velocity & temperature values, the transmitter calculates the volumetric flow rate in m3/min or ft3/min. the cross section of the duct needs to be determined for this purpose and the volumetric flow rate can displayed and directed to one of the analogue outputs.

The configuration software included in the scope of supply allows choosing the appropriate output parameter and freely scaling the display range & signal level of the two analogue outputs. In addition user-friendly calibration of the air velocity & temperature and the adjustment of key parameters (e.g. response time of the velocity measurement, low flow cutoff points, etc.) are supported as well.
An optional illuminated display with two control buttons integrated in the cover is available. In addition, this enables changes of the configuration to be made directly on the unit.

The FF86 series has a robust metal housing to protect against possible damage in rough industrial environments. There are four different models, providing a comprehensive range of mounting options;

Model A for wall mounting - Model B for duct mounting - Model C with remote probe - Model E with remote probe, pressure-tight up to 10bar (145psi)
Model A for wall mounting
Model B for duct mounting
Model C with remote probe
The FF86 series can be used to measure the velocity of other gasses as well, although a correction has to be applied to the unit at the factory.

Typical Applications:

  • Monitoring incoming and outgoing air (energy management) in HVAC applications
  • Filter monitoring and laminar flow control in cleanrooms
  • Exhaust systems; exhaust hoods and glove boxes in the pharmaceutical, bio and semiconductor industries
  • Mass flow measurements during incineration processes
  • Monitoring and measurement of compressed air systems
  • Air conveying systems - wind tunnels and climate simulators


High accuracy
Working range 0...40 m/s (0...8000 ft/min) and -40...120 °C (-40...248 °F)
Measurement of air velocity and temperature calculation of volumetric flow rate low dependence on angle of inflow probe diameter 8 mm (0.3") remote probe up to 10 m (32.8 ft) easy mounting and maintenance correction for pressure, humidity and media low flow cut-off pressure tight up to 10 bar (145 psi)

SI and US units selectable
Technical Data
Measuring value    
Air velocity    
Working range 0...2m/s (0...400ft/min)
0...10m/s (0...2000ft/min)
0...40m/s (0...8000ft/min)
Accuracy "in are at 25°C (77°f)" 0.06...2m/s (12...400ft/min) ±0.03m/s /6ft/min
At 45% RH & 1013 hPa 0.2... 0.15...10m/s (30...2000ft/min)
40m/s (40...8000ft/min)
±(0.10m/s/ 20ft/min +1% of measuring value)
±(0.10m/s/ 20ft/min +1% of measuring value)
Uncertainty of factory calibration ± (I 96 of measuring value, min. 0.015 m/s (3 ft/min))  
Temperature dependence electronic Typ. -0.005% of measuring value /°C  
Temperature dependence probe ± (0.1 % of measuring value/°C)  
Dependence Of angle of inflow:
Of direction of inflow
<3% for a < 20°
Response time <I.5...40s (configurable)  
Temperature working range Probe:
Probe cable:
Electronic with display:
-40...120 °C (-40...248 °F)
-40...105 °C (-40...221 °F)
-40...60 °C (-40...140 °F)
-30...60 °C (-22_140 °F)
Accuracy at 20 °C (68 °F) ±0.5 (±0.9 °F)  
Temperature dependence Typ. -0.01 °C /°C  
electronics Response time τ 10s  
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