For small diameter tubes Optical Bubble Sensor BE-A

The Panasonic optical Bubble Sensor BE-A is a compact sensor that Detects liquid and air bubbles without fail and fits perfectly with applicable tube sizes! The BE-A sensor offers a High-Speed Response Time for fast detection. The Ultra Compact design allows for Close Proximity Attachment and has a built-in Amplifier.

Features / Benefits

One-touch Attachment
Ultra Compact Design
High-Speed Detection

For small diameter tubes Optical Bubble Sensor BE-A

Part number list

Results 6

Models table for series For small diameter tubes Optical Bubble Sensor BE-A
Part No.	Detectable Air Gap	Sensing Object	Applicable Tube Dia. (OD × ID)	Applicable Tube Type	Supply Voltage	Current Consumption	Output (Incorporated with 2 outputs)	Output (Incorporated with 2 outputs): Output Operation	Output (Incorporated with 2 outputs): Short-Circuit Protection	Response Time: When Detecting Bubble	Response Time: When Detecting Liquid	Operation Indicator	Protection Circuits	Environmental Resistance: Ambient Temperature	Environmental Resistance: Protection	Environmental Resistance: Ambient Humidity	Environmental Resistance: Ambient Illuminance	Environmental Resistance: Voltage Withstandability	Environmental Resistance: Insulation Resistance	Environmental Resistance: Vibration Resistance	Environmental Resistance: Shock Resistance	Emitter Element	Material	Cable	Cable Extension	Clamping Torque	Weight (Typ.)	Compliant Regulation
BE-A301	0.8 mm 0.032 in or more (Note) Sensing air gap refers to the width of an air bubble formed in the entire area of the inner diameter of the tube. Please note that this product cannot sense very small air bubbles or water drops.	Liquid (Note) Sensing is affected by dirt or residues adhered to the inner wall of the tube. Please maintain the tube regularly.	ø3 mm × ø2 mm ø1/8 in × ø1/16 in (Note) When using a tube out of specifications or it doesn't have a smooth surface, please test sensing on the actual machine before use.	Transparent resin tube (equivalent to PFA) (Note) When using a tube out of specifications or it doesn't have a smooth surface, please test sensing on the actual machine before use.	5 to 24 V DC ±10 % Ripple P-P 10 % or less	15 mA or less	NPN open-collector transistor •Maximum sink current: 50 mA •Applied voltage: 30 V DC or less (between output and 0 V) •Residual voltage: 2 V or less (sink current at 50 mA) 1 V or less (sink current at 16 mA)	Switchable either Liquid-absent-ON or Liquid-present-ON	Incorporated	20 μs or less (Note) Actual response time may differ from specification (typical example using applicable tube) due to dimension, light transmission or surface state of test tube in use.	80 μs or less (Note) Actual response time may differ from specification (typical example using applicable tube) due to dimension, light transmission or surface state of test tube in use.	Orange LED (lights up with absent liquid)	Power supply reverse polarity protection , Output reverse polarity protection	-25 to +55 ℃ -13 to +131 ℉ (No dew condensation or icing allowed), Storage: -30 to +80 ℃ -22 to +176 ℉ (Note) Liquid being detected should also be kept within the rated ambient temperature range.	IP40 (IEC)	35 to 85 % RH, Storage: 35 to 85 % RH	Fluorescent light: 1,000 ℓx at the light-receiving face	1,000 V AC for between one min. between all supply terminals connected together and enclosure	20 MΩ, or more, with 250 V DC megger between all supply terminals connected together and enclosure	10 to 150 Hz frequency, 0.75 mm 0.030 in double amplitude or maximum acceleration 49 m/s², in X, Y and Z directions for two hours each	100 m/s² acceleration in X, Y, and Z directions three times each	Infrared LED(Peak emission wavelength: 855 nm 0.034 mil, non-modulated)	Enclosure: PBT, Tube holder: Polyamide, Indicator: Polycarbonate	0.09 mm² 4-core cabtyre cable 1 m 3.280 ft	Extension up to total 100 m 328.084 ft is possible with 0.3 mm², or more, cable. (Note)Confirm that the power supply voltage at the end of cable is more than 4.5 V when using an extension of over 20 m 65.167 ft.	0.5N•m or less	Net weight: 15 g approx., Gross weight: 25 g approx.	EMC Directive compliance, RoHS Directive compliance
BE-A301P	0.8 mm 0.032 in or more (Note) Sensing air gap refers to the width of an air bubble formed in the entire area of the inner diameter of the tube. Please note that this product cannot sense very small air bubbles or water drops.	Liquid (Note) Sensing is affected by dirt or residues adhered to the inner wall of the tube. Please maintain the tube regularly.	ø3 mm × ø2 mm ø1/8 in × ø1/16 in (Note) When using a tube out of specifications or it doesn't have a smooth surface, please test sensing on the actual machine before use.	Transparent resin tube (equivalent to PFA) (Note) When using a tube out of specifications or it doesn't have a smooth surface, please test sensing on the actual machine before use.	5 to 24 V DC ±10 % Ripple P-P 10 % or less	15 mA or less	PNP open-collector transistor •Maximum source current: 50 mA •Applied voltage: 30 V DC or less (between output and + V) •Residual voltage: 2 V or less (source current at 50 mA) 1 V or less (source current at 16 mA)	Switchable either Liquid-absent-ON or Liquid-present-ON	Incorporated	20 μs or less (Note) Actual response time may differ from specification (typical example using applicable tube) due to dimension, light transmission or surface state of test tube in use.	80 μs or less (Note) Actual response time may differ from specification (typical example using applicable tube) due to dimension, light transmission or surface state of test tube in use.	Orange LED (lights up with absent liquid)	Power supply reverse polarity protection , Output reverse polarity protection	-25 to +55 ℃ -13 to +131 ℉ (No dew condensation or icing allowed), Storage: -30 to +80 ℃ -22 to +176 ℉ (Note) Liquid being detected should also be kept within the rated ambient temperature range.	IP40 (IEC)	35 to 85 % RH, Storage: 35 to 85 % RH	Fluorescent light: 1,000 ℓx at the light-receiving face	1,000 V AC for between one min. between all supply terminals connected together and enclosure	20 MΩ, or more, with 250 V DC megger between all supply terminals connected together and enclosure	10 to 150 Hz frequency, 0.75 mm 0.030 in double amplitude or maximum acceleration 49 m/s², in X, Y and Z directions for two hours each	100 m/s² acceleration in X, Y, and Z directions three times each	Infrared LED(Peak emission wavelength: 855 nm 0.034 mil, non-modulated)	Enclosure: PBT, Tube holder: Polyamide, Indicator: Polycarbonate	0.09 mm² 4-core cabtyre cable 1 m 3.280 ft	Extension up to total 100 m 328.084 ft is possible with 0.3 mm², or more, cable. (Note)Confirm that the power supply voltage at the end of cable is more than 4.5 V when using an extension of over 20 m 65.167 ft.	0.5N•m or less	Net weight: 15 g approx., Gross weight: 25 g approx.	EMC Directive compliance, RoHS Directive compliance
BE-A201	0.8 mm 0.032 in or more (Note) Sensing air gap refers to the width of an air bubble formed in the entire area of the inner diameter of the tube. Please note that this product cannot sense very small air bubbles or water drops.	Liquid (Note) Sensing is affected by dirt or residues adhered to the inner wall of the tube. Please maintain the tube regularly.	ø2 mm × ø1 mm ø0.078 in × ø0.039 in (Note) When using a tube out of specifications or it doesn't have a smooth surface, please test sensing on the actual machine before use.	Transparent resin tube (equivalent to PFA) (Note) When using a tube out of specifications or it doesn't have a smooth surface, please test sensing on the actual machine before use.	5 to 24 V DC ±10 % Ripple P-P 10 % or less	15 mA or less	NPN open-collector transistor •Maximum sink current: 50 mA •Applied voltage: 30 V DC or less (between output and 0 V) •Residual voltage: 2 V or less (sink current at 50 mA) 1 V or less (sink current at 16 mA)	Switchable either Liquid-absent-ON or Liquid-present-ON	Incorporated	30 μs or less (Note) Actual response time may differ from specification (typical example using applicable tube) due to dimension, light transmission or surface state of test tube in use.	80 μs or less (Note) Actual response time may differ from specification (typical example using applicable tube) due to dimension, light transmission or surface state of test tube in use.	Orange LED (lights up with absent liquid)	Power supply reverse polarity protection , Output reverse polarity protection	-25 to +55 ℃ -13 to +131 ℉ (No dew condensation or icing allowed), Storage: -30 to +80 ℃ -22 to +176 ℉ (Note) Liquid being detected should also be kept within the rated ambient temperature range.	IP40 (IEC)	35 to 85 % RH, Storage: 35 to 85 % RH	Fluorescent light: 1,000 ℓx at the light-receiving face	1,000 V AC for between one min. between all supply terminals connected together and enclosure	20 MΩ, or more, with 250 V DC megger between all supply terminals connected together and enclosure	10 to 150 Hz frequency, 0.75 mm 0.030 in double amplitude or maximum acceleration 49 m/s², in X, Y and Z directions for two hours each	100 m/s² acceleration in X, Y, and Z directions three times each	Infrared LED(Peak emission wavelength: 855 nm 0.034 mil, non-modulated)	Enclosure: PBT, Tube holder: Polyamide, Indicator: Polycarbonate	0.09 mm² 4-core cabtyre cable 1 m 3.280 ft	Extension up to total 100 m 328.084 ft is possible with 0.3 mm², or more, cable. (Note)Confirm that the power supply voltage at the end of cable is more than 4.5 V when using an extension of over 20 m 65.167 ft.	0.5N•m or less	Net weight: 15 g approx., Gross weight: 25 g approx.	EMC Directive compliance, RoHS Directive compliance
BE-A201P	0.8 mm 0.032 in or more (Note) Sensing air gap refers to the width of an air bubble formed in the entire area of the inner diameter of the tube. Please note that this product cannot sense very small air bubbles or water drops.	Liquid (Note) Sensing is affected by dirt or residues adhered to the inner wall of the tube. Please maintain the tube regularly.	ø2 mm × ø1 mm ø0.078 in × ø0.039 in (Note) When using a tube out of specifications or it doesn't have a smooth surface, please test sensing on the actual machine before use.	Transparent resin tube (equivalent to PFA) (Note) When using a tube out of specifications or it doesn't have a smooth surface, please test sensing on the actual machine before use.	5 to 24 V DC ±10 % Ripple P-P 10 % or less	15 mA or less	PNP open-collector transistor •Maximum source current: 50 mA •Applied voltage: 30 V DC or less (between output and + V) •Residual voltage: 2 V or less (source current at 50 mA) 1 V or less (source current at 16 mA)	Switchable either Liquid-absent-ON or Liquid-present-ON	Incorporated	30 μs or less (Note) Actual response time may differ from specification (typical example using applicable tube) due to dimension, light transmission or surface state of test tube in use.	80 μs or less (Note) Actual response time may differ from specification (typical example using applicable tube) due to dimension, light transmission or surface state of test tube in use.	Orange LED (lights up with absent liquid)	Power supply reverse polarity protection , Output reverse polarity protection	-25 to +55 ℃ -13 to +131 ℉ (No dew condensation or icing allowed), Storage: -30 to +80 ℃ -22 to +176 ℉ (Note) Liquid being detected should also be kept within the rated ambient temperature range.	IP40 (IEC)	35 to 85 % RH, Storage: 35 to 85 % RH	Fluorescent light: 1,000 ℓx at the light-receiving face	1,000 V AC for between one min. between all supply terminals connected together and enclosure	20 MΩ, or more, with 250 V DC megger between all supply terminals connected together and enclosure	10 to 150 Hz frequency, 0.75 mm 0.030 in double amplitude or maximum acceleration 49 m/s², in X, Y and Z directions for two hours each	100 m/s² acceleration in X, Y, and Z directions three times each	Infrared LED(Peak emission wavelength: 855 nm 0.034 mil, non-modulated)	Enclosure: PBT, Tube holder: Polyamide, Indicator: Polycarbonate	0.09 mm² 4-core cabtyre cable 1 m 3.280 ft	Extension up to total 100 m 328.084 ft is possible with 0.3 mm², or more, cable. (Note)Confirm that the power supply voltage at the end of cable is more than 4.5 V when using an extension of over 20 m 65.167 ft.	0.5N•m or less	Net weight: 15 g approx., Gross weight: 25 g approx.	EMC Directive compliance, RoHS Directive compliance
BE-A401	0.8 mm 0.032 in or more (Note) Sensing air gap refers to the width of an air bubble formed in the entire area of the inner diameter of the tube. Please note that this product cannot sense very small air bubbles or water drops.	Liquid (Note) Sensing is affected by dirt or residues adhered to the inner wall of the tube. Please maintain the tube regularly.	ø4 mm × ø2.4 mm ø5/32 in × ø3/32 in (Note) When using a tube out of specifications or it doesn't have a smooth surface, please test sensing on the actual machine before use.	Transparent resin tube (equivalent to flexible PVC) (Note) When using a tube out of specifications or it doesn't have a smooth surface, please test sensing on the actual machine before use.	5 to 24 V DC ±10 % Ripple P-P 10 % or less	15 mA or less	NPN open-collector transistor •Maximum sink current: 50 mA •Applied voltage: 30 V DC or less (between output and 0 V) •Residual voltage: 2 V or less (sink current at 50 mA) 1 V or less (sink current at 16 mA)	Switchable either Liquid-absent-ON or Liquid-present-ON	Incorporated	20 μs or less (Note) Actual response time may differ from specification (typical example using applicable tube) due to dimension, light transmission or surface state of test tube in use.	80 μs or less (Note) Actual response time may differ from specification (typical example using applicable tube) due to dimension, light transmission or surface state of test tube in use.	Orange LED (lights up with absent liquid)	Power supply reverse polarity protection , Output reverse polarity protection	-25 to +55 ℃ -13 to +131 ℉ (No dew condensation or icing allowed), Storage: -30 to +80 ℃ -22 to +176 ℉ (Note) Liquid being detected should also be kept within the rated ambient temperature range.	IP40 (IEC)	35 to 85 % RH, Storage: 35 to 85 % RH	Fluorescent light: 1,000 ℓx at the light-receiving face	1,000 V AC for between one min. between all supply terminals connected together and enclosure	20 MΩ, or more, with 250 V DC megger between all supply terminals connected together and enclosure	10 to 150 Hz frequency, 0.75 mm 0.030 in double amplitude or maximum acceleration 49 m/s², in X, Y and Z directions for two hours each	100 m/s² acceleration in X, Y, and Z directions three times each	Infrared LED(Peak emission wavelength: 855 nm 0.034 mil, non-modulated)	Enclosure: PBT, Tube holder: Polyamide, Indicator: Polycarbonate	0.09 mm² 4-core cabtyre cable 1 m 3.280 ft	Extension up to total 100 m 328.084 ft is possible with 0.3 mm², or more, cable. (Note)Confirm that the power supply voltage at the end of cable is more than 4.5 V when using an extension of over 20 m 65.167 ft.	0.5N•m or less	Net weight: 15 g approx., Gross weight: 25 g approx.	EMC Directive compliance, RoHS Directive compliance
BE-A401P	0.8 mm 0.032 in or more (Note) Sensing air gap refers to the width of an air bubble formed in the entire area of the inner diameter of the tube. Please note that this product cannot sense very small air bubbles or water drops.	Liquid (Note) Sensing is affected by dirt or residues adhered to the inner wall of the tube. Please maintain the tube regularly.	ø4 mm × ø2.4 mm ø5/32 in × ø3/32 in (Note) When using a tube out of specifications or it doesn't have a smooth surface, please test sensing on the actual machine before use.	Transparent resin tube (equivalent to flexible PVC) (Note) When using a tube out of specifications or it doesn't have a smooth surface, please test sensing on the actual machine before use.	5 to 24 V DC ±10 % Ripple P-P 10 % or less	15 mA or less	PNP open-collector transistor •Maximum source current: 50 mA •Applied voltage: 30 V DC or less (between output and + V) •Residual voltage: 2 V or less (source current at 50 mA) 1 V or less (source current at 16 mA)	Switchable either Liquid-absent-ON or Liquid-present-ON	Incorporated	20 μs or less (Note) Actual response time may differ from specification (typical example using applicable tube) due to dimension, light transmission or surface state of test tube in use.	80 μs or less (Note) Actual response time may differ from specification (typical example using applicable tube) due to dimension, light transmission or surface state of test tube in use.	Orange LED (lights up with absent liquid)	Power supply reverse polarity protection , Output reverse polarity protection	-25 to +55 ℃ -13 to +131 ℉ (No dew condensation or icing allowed), Storage: -30 to +80 ℃ -22 to +176 ℉ (Note) Liquid being detected should also be kept within the rated ambient temperature range.	IP40 (IEC)	35 to 85 % RH, Storage: 35 to 85 % RH	Fluorescent light: 1,000 ℓx at the light-receiving face	1,000 V AC for between one min. between all supply terminals connected together and enclosure	20 MΩ, or more, with 250 V DC megger between all supply terminals connected together and enclosure	10 to 150 Hz frequency, 0.75 mm 0.030 in double amplitude or maximum acceleration 49 m/s², in X, Y and Z directions for two hours each	100 m/s² acceleration in X, Y, and Z directions three times each	Infrared LED(Peak emission wavelength: 855 nm 0.034 mil, non-modulated)	Enclosure: PBT, Tube holder: Polyamide, Indicator: Polycarbonate	0.09 mm² 4-core cabtyre cable 1 m 3.280 ft	Extension up to total 100 m 328.084 ft is possible with 0.3 mm², or more, cable. (Note)Confirm that the power supply voltage at the end of cable is more than 4.5 V when using an extension of over 20 m 65.167 ft.	0.5N•m or less	Net weight: 15 g approx., Gross weight: 25 g approx.	EMC Directive compliance, RoHS Directive compliance

Models table for series For small diameter tubes Optical Bubble Sensor BE-A
Part No.	Detectable Air Gap	Sensing Object	Applicable Tube Dia. (OD × ID)	Applicable Tube Type	Supply Voltage	Current Consumption	Output (Incorporated with 2 outputs)	Output (Incorporated with 2 outputs): Output Operation	Output (Incorporated with 2 outputs): Short-Circuit Protection	Response Time: When Detecting Bubble	Response Time: When Detecting Liquid	Operation Indicator	Protection Circuits	Environmental Resistance: Ambient Temperature	Environmental Resistance: Protection	Environmental Resistance: Ambient Humidity	Environmental Resistance: Ambient Illuminance	Environmental Resistance: Voltage Withstandability	Environmental Resistance: Insulation Resistance	Environmental Resistance: Vibration Resistance	Environmental Resistance: Shock Resistance	Emitter Element	Material	Cable	Cable Extension	Clamping Torque	Weight (Typ.)	Compliant Regulation
BE-A301	0.8 mm 0.032 in or more (Note) Sensing air gap refers to the width of an air bubble formed in the entire area of the inner diameter of the tube. Please note that this product cannot sense very small air bubbles or water drops.	Liquid (Note) Sensing is affected by dirt or residues adhered to the inner wall of the tube. Please maintain the tube regularly.	ø3 mm × ø2 mm ø1/8 in × ø1/16 in (Note) When using a tube out of specifications or it doesn't have a smooth surface, please test sensing on the actual machine before use.	Transparent resin tube (equivalent to PFA) (Note) When using a tube out of specifications or it doesn't have a smooth surface, please test sensing on the actual machine before use.	5 to 24 V DC ±10 % Ripple P-P 10 % or less	15 mA or less	NPN open-collector transistor •Maximum sink current: 50 mA •Applied voltage: 30 V DC or less (between output and 0 V) •Residual voltage: 2 V or less (sink current at 50 mA) 1 V or less (sink current at 16 mA)	Switchable either Liquid-absent-ON or Liquid-present-ON	Incorporated	20 μs or less (Note) Actual response time may differ from specification (typical example using applicable tube) due to dimension, light transmission or surface state of test tube in use.	80 μs or less (Note) Actual response time may differ from specification (typical example using applicable tube) due to dimension, light transmission or surface state of test tube in use.	Orange LED (lights up with absent liquid)	Power supply reverse polarity protection , Output reverse polarity protection	-25 to +55 ℃ -13 to +131 ℉ (No dew condensation or icing allowed), Storage: -30 to +80 ℃ -22 to +176 ℉ (Note) Liquid being detected should also be kept within the rated ambient temperature range.	IP40 (IEC)	35 to 85 % RH, Storage: 35 to 85 % RH	Fluorescent light: 1,000 ℓx at the light-receiving face	1,000 V AC for between one min. between all supply terminals connected together and enclosure	20 MΩ, or more, with 250 V DC megger between all supply terminals connected together and enclosure	10 to 150 Hz frequency, 0.75 mm 0.030 in double amplitude or maximum acceleration 49 m/s², in X, Y and Z directions for two hours each	100 m/s² acceleration in X, Y, and Z directions three times each	Infrared LED(Peak emission wavelength: 855 nm 0.034 mil, non-modulated)	Enclosure: PBT, Tube holder: Polyamide, Indicator: Polycarbonate	0.09 mm² 4-core cabtyre cable 1 m 3.280 ft	Extension up to total 100 m 328.084 ft is possible with 0.3 mm², or more, cable. (Note)Confirm that the power supply voltage at the end of cable is more than 4.5 V when using an extension of over 20 m 65.167 ft.	0.5N•m or less	Net weight: 15 g approx., Gross weight: 25 g approx.	EMC Directive compliance, RoHS Directive compliance
BE-A301P	0.8 mm 0.032 in or more (Note) Sensing air gap refers to the width of an air bubble formed in the entire area of the inner diameter of the tube. Please note that this product cannot sense very small air bubbles or water drops.	Liquid (Note) Sensing is affected by dirt or residues adhered to the inner wall of the tube. Please maintain the tube regularly.	ø3 mm × ø2 mm ø1/8 in × ø1/16 in (Note) When using a tube out of specifications or it doesn't have a smooth surface, please test sensing on the actual machine before use.	Transparent resin tube (equivalent to PFA) (Note) When using a tube out of specifications or it doesn't have a smooth surface, please test sensing on the actual machine before use.	5 to 24 V DC ±10 % Ripple P-P 10 % or less	15 mA or less	PNP open-collector transistor •Maximum source current: 50 mA •Applied voltage: 30 V DC or less (between output and + V) •Residual voltage: 2 V or less (source current at 50 mA) 1 V or less (source current at 16 mA)	Switchable either Liquid-absent-ON or Liquid-present-ON	Incorporated	20 μs or less (Note) Actual response time may differ from specification (typical example using applicable tube) due to dimension, light transmission or surface state of test tube in use.	80 μs or less (Note) Actual response time may differ from specification (typical example using applicable tube) due to dimension, light transmission or surface state of test tube in use.	Orange LED (lights up with absent liquid)	Power supply reverse polarity protection , Output reverse polarity protection	-25 to +55 ℃ -13 to +131 ℉ (No dew condensation or icing allowed), Storage: -30 to +80 ℃ -22 to +176 ℉ (Note) Liquid being detected should also be kept within the rated ambient temperature range.	IP40 (IEC)	35 to 85 % RH, Storage: 35 to 85 % RH	Fluorescent light: 1,000 ℓx at the light-receiving face	1,000 V AC for between one min. between all supply terminals connected together and enclosure	20 MΩ, or more, with 250 V DC megger between all supply terminals connected together and enclosure	10 to 150 Hz frequency, 0.75 mm 0.030 in double amplitude or maximum acceleration 49 m/s², in X, Y and Z directions for two hours each	100 m/s² acceleration in X, Y, and Z directions three times each	Infrared LED(Peak emission wavelength: 855 nm 0.034 mil, non-modulated)	Enclosure: PBT, Tube holder: Polyamide, Indicator: Polycarbonate	0.09 mm² 4-core cabtyre cable 1 m 3.280 ft	Extension up to total 100 m 328.084 ft is possible with 0.3 mm², or more, cable. (Note)Confirm that the power supply voltage at the end of cable is more than 4.5 V when using an extension of over 20 m 65.167 ft.	0.5N•m or less	Net weight: 15 g approx., Gross weight: 25 g approx.	EMC Directive compliance, RoHS Directive compliance
BE-A201	0.8 mm 0.032 in or more (Note) Sensing air gap refers to the width of an air bubble formed in the entire area of the inner diameter of the tube. Please note that this product cannot sense very small air bubbles or water drops.	Liquid (Note) Sensing is affected by dirt or residues adhered to the inner wall of the tube. Please maintain the tube regularly.	ø2 mm × ø1 mm ø0.078 in × ø0.039 in (Note) When using a tube out of specifications or it doesn't have a smooth surface, please test sensing on the actual machine before use.	Transparent resin tube (equivalent to PFA) (Note) When using a tube out of specifications or it doesn't have a smooth surface, please test sensing on the actual machine before use.	5 to 24 V DC ±10 % Ripple P-P 10 % or less	15 mA or less	NPN open-collector transistor •Maximum sink current: 50 mA •Applied voltage: 30 V DC or less (between output and 0 V) •Residual voltage: 2 V or less (sink current at 50 mA) 1 V or less (sink current at 16 mA)	Switchable either Liquid-absent-ON or Liquid-present-ON	Incorporated	30 μs or less (Note) Actual response time may differ from specification (typical example using applicable tube) due to dimension, light transmission or surface state of test tube in use.	80 μs or less (Note) Actual response time may differ from specification (typical example using applicable tube) due to dimension, light transmission or surface state of test tube in use.	Orange LED (lights up with absent liquid)	Power supply reverse polarity protection , Output reverse polarity protection	-25 to +55 ℃ -13 to +131 ℉ (No dew condensation or icing allowed), Storage: -30 to +80 ℃ -22 to +176 ℉ (Note) Liquid being detected should also be kept within the rated ambient temperature range.	IP40 (IEC)	35 to 85 % RH, Storage: 35 to 85 % RH	Fluorescent light: 1,000 ℓx at the light-receiving face	1,000 V AC for between one min. between all supply terminals connected together and enclosure	20 MΩ, or more, with 250 V DC megger between all supply terminals connected together and enclosure	10 to 150 Hz frequency, 0.75 mm 0.030 in double amplitude or maximum acceleration 49 m/s², in X, Y and Z directions for two hours each	100 m/s² acceleration in X, Y, and Z directions three times each	Infrared LED(Peak emission wavelength: 855 nm 0.034 mil, non-modulated)	Enclosure: PBT, Tube holder: Polyamide, Indicator: Polycarbonate	0.09 mm² 4-core cabtyre cable 1 m 3.280 ft	Extension up to total 100 m 328.084 ft is possible with 0.3 mm², or more, cable. (Note)Confirm that the power supply voltage at the end of cable is more than 4.5 V when using an extension of over 20 m 65.167 ft.	0.5N•m or less	Net weight: 15 g approx., Gross weight: 25 g approx.	EMC Directive compliance, RoHS Directive compliance
BE-A201P	0.8 mm 0.032 in or more (Note) Sensing air gap refers to the width of an air bubble formed in the entire area of the inner diameter of the tube. Please note that this product cannot sense very small air bubbles or water drops.	Liquid (Note) Sensing is affected by dirt or residues adhered to the inner wall of the tube. Please maintain the tube regularly.	ø2 mm × ø1 mm ø0.078 in × ø0.039 in (Note) When using a tube out of specifications or it doesn't have a smooth surface, please test sensing on the actual machine before use.	Transparent resin tube (equivalent to PFA) (Note) When using a tube out of specifications or it doesn't have a smooth surface, please test sensing on the actual machine before use.	5 to 24 V DC ±10 % Ripple P-P 10 % or less	15 mA or less	PNP open-collector transistor •Maximum source current: 50 mA •Applied voltage: 30 V DC or less (between output and + V) •Residual voltage: 2 V or less (source current at 50 mA) 1 V or less (source current at 16 mA)	Switchable either Liquid-absent-ON or Liquid-present-ON	Incorporated	30 μs or less (Note) Actual response time may differ from specification (typical example using applicable tube) due to dimension, light transmission or surface state of test tube in use.	80 μs or less (Note) Actual response time may differ from specification (typical example using applicable tube) due to dimension, light transmission or surface state of test tube in use.	Orange LED (lights up with absent liquid)	Power supply reverse polarity protection , Output reverse polarity protection	-25 to +55 ℃ -13 to +131 ℉ (No dew condensation or icing allowed), Storage: -30 to +80 ℃ -22 to +176 ℉ (Note) Liquid being detected should also be kept within the rated ambient temperature range.	IP40 (IEC)	35 to 85 % RH, Storage: 35 to 85 % RH	Fluorescent light: 1,000 ℓx at the light-receiving face	1,000 V AC for between one min. between all supply terminals connected together and enclosure	20 MΩ, or more, with 250 V DC megger between all supply terminals connected together and enclosure	10 to 150 Hz frequency, 0.75 mm 0.030 in double amplitude or maximum acceleration 49 m/s², in X, Y and Z directions for two hours each	100 m/s² acceleration in X, Y, and Z directions three times each	Infrared LED(Peak emission wavelength: 855 nm 0.034 mil, non-modulated)	Enclosure: PBT, Tube holder: Polyamide, Indicator: Polycarbonate	0.09 mm² 4-core cabtyre cable 1 m 3.280 ft	Extension up to total 100 m 328.084 ft is possible with 0.3 mm², or more, cable. (Note)Confirm that the power supply voltage at the end of cable is more than 4.5 V when using an extension of over 20 m 65.167 ft.	0.5N•m or less	Net weight: 15 g approx., Gross weight: 25 g approx.	EMC Directive compliance, RoHS Directive compliance
BE-A401	0.8 mm 0.032 in or more (Note) Sensing air gap refers to the width of an air bubble formed in the entire area of the inner diameter of the tube. Please note that this product cannot sense very small air bubbles or water drops.	Liquid (Note) Sensing is affected by dirt or residues adhered to the inner wall of the tube. Please maintain the tube regularly.	ø4 mm × ø2.4 mm ø5/32 in × ø3/32 in (Note) When using a tube out of specifications or it doesn't have a smooth surface, please test sensing on the actual machine before use.	Transparent resin tube (equivalent to flexible PVC) (Note) When using a tube out of specifications or it doesn't have a smooth surface, please test sensing on the actual machine before use.	5 to 24 V DC ±10 % Ripple P-P 10 % or less	15 mA or less	NPN open-collector transistor •Maximum sink current: 50 mA •Applied voltage: 30 V DC or less (between output and 0 V) •Residual voltage: 2 V or less (sink current at 50 mA) 1 V or less (sink current at 16 mA)	Switchable either Liquid-absent-ON or Liquid-present-ON	Incorporated	20 μs or less (Note) Actual response time may differ from specification (typical example using applicable tube) due to dimension, light transmission or surface state of test tube in use.	80 μs or less (Note) Actual response time may differ from specification (typical example using applicable tube) due to dimension, light transmission or surface state of test tube in use.	Orange LED (lights up with absent liquid)	Power supply reverse polarity protection , Output reverse polarity protection	-25 to +55 ℃ -13 to +131 ℉ (No dew condensation or icing allowed), Storage: -30 to +80 ℃ -22 to +176 ℉ (Note) Liquid being detected should also be kept within the rated ambient temperature range.	IP40 (IEC)	35 to 85 % RH, Storage: 35 to 85 % RH	Fluorescent light: 1,000 ℓx at the light-receiving face	1,000 V AC for between one min. between all supply terminals connected together and enclosure	20 MΩ, or more, with 250 V DC megger between all supply terminals connected together and enclosure	10 to 150 Hz frequency, 0.75 mm 0.030 in double amplitude or maximum acceleration 49 m/s², in X, Y and Z directions for two hours each	100 m/s² acceleration in X, Y, and Z directions three times each	Infrared LED(Peak emission wavelength: 855 nm 0.034 mil, non-modulated)	Enclosure: PBT, Tube holder: Polyamide, Indicator: Polycarbonate	0.09 mm² 4-core cabtyre cable 1 m 3.280 ft	Extension up to total 100 m 328.084 ft is possible with 0.3 mm², or more, cable. (Note)Confirm that the power supply voltage at the end of cable is more than 4.5 V when using an extension of over 20 m 65.167 ft.	0.5N•m or less	Net weight: 15 g approx., Gross weight: 25 g approx.	EMC Directive compliance, RoHS Directive compliance
BE-A401P	0.8 mm 0.032 in or more (Note) Sensing air gap refers to the width of an air bubble formed in the entire area of the inner diameter of the tube. Please note that this product cannot sense very small air bubbles or water drops.	Liquid (Note) Sensing is affected by dirt or residues adhered to the inner wall of the tube. Please maintain the tube regularly.	ø4 mm × ø2.4 mm ø5/32 in × ø3/32 in (Note) When using a tube out of specifications or it doesn't have a smooth surface, please test sensing on the actual machine before use.	Transparent resin tube (equivalent to flexible PVC) (Note) When using a tube out of specifications or it doesn't have a smooth surface, please test sensing on the actual machine before use.	5 to 24 V DC ±10 % Ripple P-P 10 % or less	15 mA or less	PNP open-collector transistor •Maximum source current: 50 mA •Applied voltage: 30 V DC or less (between output and + V) •Residual voltage: 2 V or less (source current at 50 mA) 1 V or less (source current at 16 mA)	Switchable either Liquid-absent-ON or Liquid-present-ON	Incorporated	20 μs or less (Note) Actual response time may differ from specification (typical example using applicable tube) due to dimension, light transmission or surface state of test tube in use.	80 μs or less (Note) Actual response time may differ from specification (typical example using applicable tube) due to dimension, light transmission or surface state of test tube in use.	Orange LED (lights up with absent liquid)	Power supply reverse polarity protection , Output reverse polarity protection	-25 to +55 ℃ -13 to +131 ℉ (No dew condensation or icing allowed), Storage: -30 to +80 ℃ -22 to +176 ℉ (Note) Liquid being detected should also be kept within the rated ambient temperature range.	IP40 (IEC)	35 to 85 % RH, Storage: 35 to 85 % RH	Fluorescent light: 1,000 ℓx at the light-receiving face	1,000 V AC for between one min. between all supply terminals connected together and enclosure	20 MΩ, or more, with 250 V DC megger between all supply terminals connected together and enclosure	10 to 150 Hz frequency, 0.75 mm 0.030 in double amplitude or maximum acceleration 49 m/s², in X, Y and Z directions for two hours each	100 m/s² acceleration in X, Y, and Z directions three times each	Infrared LED(Peak emission wavelength: 855 nm 0.034 mil, non-modulated)	Enclosure: PBT, Tube holder: Polyamide, Indicator: Polycarbonate	0.09 mm² 4-core cabtyre cable 1 m 3.280 ft	Extension up to total 100 m 328.084 ft is possible with 0.3 mm², or more, cable. (Note)Confirm that the power supply voltage at the end of cable is more than 4.5 V when using an extension of over 20 m 65.167 ft.	0.5N•m or less	Net weight: 15 g approx., Gross weight: 25 g approx.	EMC Directive compliance, RoHS Directive compliance

One-Touch Attachment

Simply attach the sensor with your hand
Hassle-free one-touch attachment without using tools
The Built-In Amplifier allows for immediate installation without the need for sensitivity adjustments

Ultra-compact Design

Fingertip sized for installation in narrow spaces
Allows for close proximity attachment
Able to be installed in parallel or in a staggered pattern
With a built-in amplifier, the BE-A works with a range of voltages from 5 to 24VDC
Designed to work with tube sizes ø2 mm, ø3 mm, ø4 mm, without obstructing the flow

High-Speed Detection

0.8 mm (0.032 in) air gaps are reliably detected by optical technology at a response time of 20 μs (The BE-A201(P) response time is 30 μs. This makes the BE-A ideal for traceability of the analysis process.

For small diameter tubes Optical Bubble Sensor BE-A

For small diameter tubes Optical Bubble Sensor BE-A

Part number list

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