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Vane Wheel Flow Sensors FA |
Sensors for measuring in air/gases and water/liquids for stationary and mobile use |
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The principle of measurement is based on the fact that a vane wheel rotates at a speed proportional to the flow velocity of a fluid into which it is immersed. The rotational speed is almost independent of density, pressure and temperature of the medium.
The sensing of the vane wheel rotation is by means of a proximity switch without the slightest braking effect on the vane wheel. By fitting a further proximity switch, sensing of the direction of the vane wheel rotation and the indication of the +/-direction of flow is made possible.
Determined by its light weight, the vane wheel rotational speed adapts in milliseconds to velocity increases, even when
being used in gases.
All vane wheel flow sensors are calibrated on the same frequency, so that sensors of the same type are interchangeable. |
 
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A combination of vane wheel flow sensor FA and a suitable evaluation unit is necessary for successful measuring. |
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Flowtherm cylinder probe FT
Insertion probe with integrated Pt100 probe for measuring temperature |
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Special specifications |
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such as cylinder probe with protective mesh or T-probes for achieving
a higher rate of indirect oncoming flow indifference |
Types of cylinder probes |
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initial smallest measurable flow rate dependent on type of vane wheel:
in gases 0.2...1.6 m/s; in liquids 0.01...0.08 m/s |
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terminal flow rate dependent on type of vane wheel:
in gases 3 m/s; 20 m/s; 40 m/s; 80 m/s;120 m/s; in liquids: 3 m/s; 7.5 m/s; 10 m/s; condition: no cavitation |
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probe diameter: 14/15 mm; 16 mm; 18 mm; 18/20 mm; 25 mm; 25/27 mm and 30 mm |
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working temperature range: up to +100° C; +140 °C; +260 °C; +370 °C; +450 °C and +500 °C |
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maximum working pressure: up to 25 bar overpressure |
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explosion-proof type of protection: Category 1G and 1D Zone 0 and Zone 20; Category 2G and 2D Zone 1 and Zone 21 |
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probe tube material: aluminium, stainless steel, titanium |
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special designs on request |
Accessories for cylinder probes |
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probe tubes/extension rods for screwing onto extendable
cylinder probes |
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probe guide pieces with flange or screw thread connection for installing cylinder probes in pipelines and ducts |
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direction indicator for clamping onto the probe tube;
may also be used as a depth indicator |
FA·Di measuring tubes |
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for recording volume flow / flow velocity |
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FAR·Di |
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for measuring volume flow/flow velocity
for ± direction sensing |
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Special specifications |
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also available with integrated temperature
probe Pt100 and / or built-in absolute pressure gauge |
Types of FA·Di measuring tubes |
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measuring tube inside diameter: 9.7 mm; 18.2 mm; 25 mm; 32 mm; 40 mm; 50 mm ... |
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alternative forms of connection depending on inside diameter of measuring tube:
tube fittings; cutting ring fittings; flange connection;
flat tube ends; internal screw thread for connecting nipples |
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alternatively with / without input / output section |
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initial smallest measurable flow rate dependent on type of vane wheel: in gases from 0.08 m3/h,
in liquids 0.007 m3/h |
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terminal flow rate dependent on type of vane wheel: in gases 20 m/s; 40 m/s; 80 m/s;120 m/s;
in liquids: 3 m/s; 7.5 m/s; 10 m/s |
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working temperature range: -20° C...+100 °C; -20 °C...+240 °C and above |
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maximum working pressure: up to 25 bar above atmospheric |
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materials: stainless steel; PVDF; aluminium ... |
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explosion-proof type of protection: Category 1G and 1D Zone 0 and Zone 20; Category 2G and 2D Zone 1 and Zone 21 |
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special designs on request |
Transducer UFA integrated in Ex-d sensor connection housing |
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integrated transducer in Ex-d sensor connection housing for vane wheel flow probes FA / FAR or measuring tubes FA Di |
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Hart interface for changing the calibration and parameter data |
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Ex-protection: Category I Zone 0 and 20, Category II Zone 1 and 21 |
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analog output: 4-20 mA |
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relay output optional for flow direction, limit value or quantity pulse configurable |
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optional LCD display for instantaneous value and counter |
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power supply: 24 VDC |
Transducer UFA / LDG16 |
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Configurable digital transducer |
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for vane wheel flow sensors FA with and without
directional sensing |
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PC interface for changing calibration and parameter data analog output: 4-20 mA, 0-10 V; optional |
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relay output optional for flow direction, limit value or quantity pulse configurable |
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power supply: 230 VAC; 24 VDC and 12 VDC; optional |
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design: LDG16 surface mounting housing (W/H/D = 55/75/110) for 35 mm
standard assembly rail |
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conversion from actual to standard flow velocity
or, alternatively, flow rate |
Transducer UFA / AS102 |
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Configurable digital transducer with IP65 type of protection |
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for vane wheel flow sensors FA with and without directional sensing |
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PC interface for changing calibration and parameter data analog output: 4-20 mA, 0-10 V; optional |
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relay output optional for flow direction, limit value or quantity pulse configurable |
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optional LCD display with instantaneous value and counter |
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power supply: 230 VAC; 24 VDC and 12 VDC; optional |
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design: aluminium housing AS102 IP65 (W/H/D = 100/75/110 mm) |
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conversion from actual to standard flow velocity
or, alternatively, flow rate |
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LDX1A / LDX2 |
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isolation/supply unit for connection of vane wheel flow sensors FA with and without direction sensing in EEx ia IIC T6 type of protection |
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operation only permissible with non-Ex evaluation units: transducer U1a or transducer U2a or system instrument in LDG30 housing (see below) |
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LDX1A ATEX and secondary evaluation unit are to be placed in a non-hazardous space |
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power supply: 230 VAC, 24 VAC; optional; DC supply with series connected DC/AC converter possible! |
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LDG16 miniature housing (W/H/D = 55/75/110) for 35 mm standard
assembly rails |
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