Part No.: 02E1000

Optical Flow Sensor FA-1 bi

Product features

Optical flow alarm sensor for bistable and monostable use
Bistable: sensor detects if sufficient or low flow is present
Monostable: sensor detects set flow value
For float-type flow meters with measuring tubes out of translucent material
Measuring tube diameter: 5 to 14 mm
Mounting with pressure screw
3 m connection cable

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Product information & downloads

Manual 945 KB

Data sheet 152 KB

Unit calculator

Barometric adjustment of the operating altitude of O₂ analyzers without pressure compensation

Enter the planned operating altitude in the field. Set the analyzer to the calculated O2 vol% value at 1013 mbar (altitude = 0 m) in air to measure at the planned operating altitude without barometric error.

planned operating altitude above sea level in [m]

Result: 22,9378 [vol%] need to be set to measure at the planned altitude without barometric error.*

*Air with standard pressure 1013 mbar = 20.93 vol% O₂

Pressure drop and delay time

Enter your values in fields 1 to 3.

1 Hose/tube diameter in [mm]

2 Tube length in [m]

3 Flow rate in [Nl/h] Standard flow rate Nl/h
Volume flow under following
Defined conditions:

Temperature = 273.15 K (0 °C)
Pressure = 1,01325016 bar (760 mm HG)
Air density = 1,294 kg/m³ (dry air)

Result: 3,39 Delay time approx. in [s]*

* Single change of gas, for 90 % response time approx. 3 changes of sample volume are required.

Calculation of the pressureless 100 % H₂O saturation

Enter the required H₂O dew point (°C).
The calculation only provides sufficiently accurate values in the temperature range between -20 °C and +90 °C.

H₂O dew point [°C]

H₂O volume proportion [vol%]

H₂O weight proportion per standard cubic meter gas [in g/Nm³] Standard flow rate Nl/h
Volume flow under following
Defined conditions:

Temperature = 273.15 K (0 °C)
Pressure = 1,01325016 bar (760 mm HG)
Air density = 1,294 kg/m³ (dry air)

Pressure units

Enter a value to be converted in the respective field. All other fields will show the converted value immediately.

[at] technical atmosphere

[atm] physical atmosphere

[bar] bar

[kPa] = kN/m²] kilopascal

[psi = lb/in²] psi

[ft H₂O] foot of water (4 °C)

[inch H₂O] inch of water (4 °C)

[inch Hg] inch of mercury (0 °C)

[Torr = mm Hg] mm of mercury (0 °C)

Temperature units

Enter a value to be converted in the respective field. All other fields will show the converted value immediately.

[°C] °Celsius

[°F] °Fahrenheit

Length units

Enter a value to be converted in the respective field. All other fields will show the converted value immediately.

[mm] millimeter

[cm] centimeter

[m] meter

[km] kilometer

[mi] mile

[ft] foot

[in] inch

Area units

Enter a value to be converted in the respective field. All other fields will show the converted value immediately.

[cm²] square centimeter

[m²] square meter

[km²] square kilometer

[mi²] square mile

[ft²] square foot

[in²] square inch

Volume units

Enter a value to be converted in the respective field. All other fields will show the converted value immediately.

[cm³] cubic centimeter

[dm³] cubic decimeter

[m³] cubic meter

[in³] cubic inch

[ft³] cubic foot

[gal] US gallon

Weight units

Enter a value to be converted in the respective field. All other fields will show the converted value immediately.

[g] gram

[kg] kilogram

[oz] ounce

[lb] pound

Energy units

Enter a value to be converted in the respective field. All other fields will show the converted value immediately.

[J] joule = watt-second [Ws]

[kJ] kilojoule

[kWh] kilowatt-hour

[kcal_th] thermochemical kilocalorie

[Btu] British thermal unit

Flow rate

Enter a value to be converted in the respective field. All other fields will show the converted value immediately.

[m³/s] cubic meter per second

[l/s] liter per second

[l/min] liter per minute

[l/h] liter per hour

[m³/h] cubic meter per hour

[ft³/min] cubic foot per minute

Flow velocity

Enter a value to be converted in the respective field. All other fields will show the converted value immediately.

[m/s] meter per second

[km/h] kilometer per hour

[ft/s] foot per second

[mile/h] mile per hour

Performance units

Enter a value to be converted in the respective field. All other fields will show the converted value immediately.

[kJ/h] kilojoule per hour

[W] watt

Overview
Applications
Description

For non-heated flow meters FM1/10/40, clamping range from 5 to 14 mm

The patented forked light-barrier FA-... bi is used in gas and water analysis for flow monitoring in float-type flow meters with measuring tubes made of translucent material, e.g. Duran glass. Thanks to optical scanning, very low flow quantities can be detected by flow meters with non-metallic or very small (1 mm) floating balls.

Photoelectric bistable clamp‑on flow sensor type FA1bi, clamping range: 5 to 14 mm, 3 m connecting cable