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For small diameter tubes Optical Bubble Sensor BE-A

Specifications

Type for ø2 mm ø0.078 in tube for ø3 mm ø0.125 in tube for ø4 mm ø0.156 in tube
Model No. NPN output BE-A201 BE-A301 BE-A401
PNP output BE-A201P BE-A301P BE-A401P
Regulatory compliance EMC Directive, RoHS Directive
Detectable air gap
(Note 2)
0.8 mm 0.032 in or more
Sensing object Liquid (Note 3)
Applicable tube dia.
(Note 4)
Outer dia. ø2 mm ±0.2 mm
ø0.078 in ±0.008 in
ø3 mm ±0.2 mm
ø1/8 in ±0.008 in
ø4 mm ±0.15 mm
ø5/32 in ±0.006 in
Inner dia. ø1 mm ±0.2 mm
ø0.039 in ±0.008 in
ø2 mm ±0.2 mm
ø1/16 in ±0.008 in
ø2.4 mm ±0.1 mm
ø3/32 in ±0.004 in
Applicable tube type
(Note 4)
Transparent resin tube (equivalent to PFA) Transparent resin tube
(equivalent to flexible PVC)
Supply voltage 5 to 24 V DC ±10 % Ripple P-P 10 % or less
Current consumption 15 mA or less
Output
(Incorporated with 2 outputs)
<NPN output type>
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)

<PNP output type>
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)
  Output
operation
Switchable either Liquid-absent-ON or Liquid-present-ON
Short-circuit
protection
Incorporated
Response time
(Note 5)
When
detecting bubble
30 μs or less 20 μs or less
When
detecting liquid
80 μs or less
Operation indicator Orange LED (lights up with absent liquid)
Protection circuits Power supply reverse polarity protection , Output reverse polarity protection
Environmental
resistance
Protection IP40 (IEC)
Ambient
temperature
(Note 6)
-25 to +55 ℃ -13 to +131 ℉ (No dew condensation or icing allowed),
Storage: -30 to +80 ℃ -22 to +176 ℉
Ambient
humidity
35 to 85 % RH, Storage: 35 to 85 % RH
Ambient
illuminance
Fluorescent light: 1,000 ℓx at the light-receiving face
Voltage
withstandability
1,000 V AC for between one min. between all supply terminals connected together and enclosure
Insulation
resistance
20 MΩ, or more, with 250 V DC megger between all supply terminals connected together and enclosure
Vibration
resistance
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
Shock
resistance
100 m/s2 acceleration in X, Y, and Z directions three times each
Emitter element Infrared LED(Peak emission wavelength: 855 nm 0.034 mil, non-modulated)
Material Enclosure: PBT, Tube holder: Polyamide, Indicator: Polycarbonate
Cable 0.09 mm2 4-core cabtyre cable 1 m 3.280 ft
Cable extension (Note 7) Extension up to total 100 m 328.084 ft is possible with 0.3 mm2, or more, cable.
Clamping torque 0.5N•m or less
Weight Net weight: 15 g approx., Gross weight: 25 g approx.

Notes:

1) Where measurement conditions have not been specified precisely, the conditions used were an ambient temperature of +23 ℃ +73.4 ℉.
2) 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. Refer to the figure 1 and 2.

3) Sensing is affected by dirt or residues adhered to the inner wall of the tube. Please maintain the tube regularly.
4) 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) 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.
6) Liquid being detected should also be kept within the rated ambient temperature range.
7) 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.

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