Liquid level sensor, Through Beam, Light & Dark On, NPN Output, 12-24 VDC


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Liquid level detection sensors BL Series detects the presence or absence of liquid in a transparent pipe measuring ??6-13mm in diameter and 1mm in thickness. Users can select Light On/Dark On modes from operation mode switching button and easily check operation mode and status from LED bulbs (green/red) at the back. Also, BL Series is space efficient with its compact design.

Main Features

* Detects presence/absence of liquid in a transparent pipe of external diameter of ??6 to 13mm and 1mm thickness (Max)
* Compact size : W23 X H14 X L13mm 
* Light ON/Dark ON selectable from operation mode switching button
* Easy to check operation mode(Light ON : green, Dark ON : off) and status from Red LED bulbs
* Built-in protection circuits for reverse power polarity, output short & overcurrent 

* Minimizes the impact of the external environment by the protection bracket(sold separately) [??12.7mm (1/2 inch) pipe]
* Protection structure IP64 (IEC standard) 
* Protective bracket (Sold separately)


Model NPN output BL13-TDT
PNP output BL13-TDT-P
Sensing type Through-beam
Applicable pipe Ø6 to 13mm(thickness: 1mm) transparent pipe
(FEP(fluoroplastic) or with equivalent transparency)
Standard sensing target Liquid in a pipe†1
Response time Max. 2ms
Power supply 12-24VDC ±10%(Ripple P-P: Max. 10%)
Current consumption Max. 30mA
Light source Infrared LED(950nm)
Operation mode Light ON/Dark ON switching by operation mode switching button
Control output NPN or PNP open collector output
• Load voltage: Max. 30VDC   • Load current: Max. 100mA   • Residual voltage: Max. 1V
Protection circuit Reverse polarity protection circuit, output short-circuit protection circuit
Indicator Operation indicator: Red LED, Operation mode indicator: Green LED
Insulation resistance Min. 20MΩ(at 500VDC megger)
Noise resistance ±240V the square wave noise(pulse width: 1µs) by the noise simulator
Dielectric strength 1,000VAC 50/60Hz for 1 minute(between all terminals and case)
Vibration 1.5mm amplitude or 300m/s2 at frequency of 10 to 55Hz in each of X, Y, Z directions for 2 hours
Shock 500m/s2(approx. 50G) in each of X,Y, Z directions for 3 times
Environment Ambient illumination Sunlight/Incandescent lamp: Max. 3,000lx for each (Receiver illumination)
Ambient temperature 10 to 55°C, storage: -25 to 65°C
Ambient humidity 35 to 85%RH, storage: 35 to 85%RH
Protection IP64(IEC standards)
Material Case: PC
Cable Ø2.5, 3-wire, Length: 1m
(AWG28, Core diameter: 0.08mm, Number of cores: 19, Insulator diameter: Ø0.9)
Accessory Binding band 2EA, Anti-slip tube 2EA
Approval CE
Unit weight Approx. 30g
†1: This may not detect the liquid with low transparent, with high viscosity, or with floating matters.
†The temperature or humidity mentioned in Environment indicates a non freezing or condensation environment.




Catalog BL Series
Manual BL Series
CAD BL Series
Certificates BL Series


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