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- Optical Liquid Level Switch (Polyamide) (BDL01-01)
Optical Liquid Level Switch (Polyamide)
If you need a low-cost and small size device to measure the liquid levels for industrial application where space is limited, an optical level switch might be a perfect candidate. Optical liquid level sensors are suitable for water level measuring and monitoring. Our optical level switches are no moving parts to cause unreliability, and these small units are ideal for a wide range of applications, such as home appliances, food and beverage industries, hydraulic reservoirs, pharmaceutical systems, etc.
Optical Liquid Level Sensor / Switch
An optical level sensor uses the principle of light reflection. The light in a prism is emitted from an infrared LED and reflected back to the receiver directly when the sensor is in air. However, when the sensor tip is immersed in liquid, most of light is lost in liquid, leaving little to return back to the receiver.
It is a suitable product for you to satisfy your needs if you want to install a liquid level sensor in areas where space is limited. The Series BDL01 Optical Level Switches are designed for detecting and monitoring point level. It is a kind of low price liquid level sensor. The electro-optic level switch measures the high or low of most liquid, water-based and oil. For detecting minimum or maximum level, the sensor must be installed at the desired height. Three optional materials, polyamide, polysulfone and SS316L provide application flexibility. This sensor requires a power supply of between 10-30 VDC. The level output modes are normally open when the sensor tip is dry and closed in presence of liquid. It not only can be easily mounted, but provides rapid response while employing.
Model | BDL01-01 |
Housing Material | Polyamide |
Prism Material | Polyamide |
Process Connection | M12x1.0 |
Operating Temperature | -20~65°C |
Operating Pressure | 7bar |
Indicator Lamp | Orange |
Accuracy | ±1mm |
Supply Voltage | 10~30VDC |
Current Consumptions (No load) | 10mA maximum |
Output | NPN / PNP |
Load Current (Max) | 100mA |
Output Mode | normally open or closed in air |
Electrical Protection | Activate delay time, reverse polarity protection, output short-circuit protection, output reverse connection protection |
Response Time | 1ms |
Electrical Endurance | ≥100,000 times |
Ambient Light | Incandescent bulb:under 5,000lx / Sunlight:under 80,000lx |
Lead Length | 30cm |
Housing Protection | IP67 |
Mounted from inside

Mounted from outside

NPN open collector output

PNP open collector output

These units are designed for installing horizontally or up to 45° from horizontal only.

Mounted from inside

Mounted from outside
