Q: This photoelectric can really sense clear water?
A: Yes. As you know, thin layers of water are transparent to light in the visible spectrum. Photoelectrics with standard visible LEDs burn right through water and typically can't be used to detect the presence of water. However, the QS30 H2O uses an infrared LED at a wavelength of 1450 nm that is efficiently absorbed by water and many water-based liquids. If our eyes could see color in the infrared spectrum, at 1450 nm water would appear black.
Q: Will the sensor work on any liquid?
A: It will, as long as that liquid contains some amount of water. For example, it will work on juice, milk, hydrogen peroxide, rubbing alcohol, hair gel, soap or vinegar. Non water-based fluids may still block some of the emitted light because of factors like viscosity, or color. However, this sensor's key strength - its ability to detect water-based liquids using the 1450 nm wavelength - will not be useful in applications involving fluids such as vegetable oil or hydrocarbons. If you have any questions about whether or not the liquid in your application will be detected, you can always send a sample to our labs and we can test it.
Q: Can I use this sensor to detect solids with a high water content?
A: Yes, like any photoelectric sensor, the QS30 H2O can be used to detect solid objects even with no water content. If the target blocks enough of the emitted light beam, it will be detected.
Q: Can I use this sensor to tell what percentage of the liquid is water?
A: No, the sensor doesnít output a reading on the percentage of water in the sample. It's used to detect the presence or absence of water, which for visible light photoelectric sensor can be a very low contrast and difficult application.
Q: Does the color of the liquid matter?
A: Yes, the color of the liquid affects the total amount of light blocked by the fluid. You can expect a dark cola to block more light than clear water. A standard red LED sensor may work adequately in applications where you're detecting the presence of colored fluid. The QS30 H2O sensor provides additional contrast sensitivity by taking advantage of the 1450 nm absorption band of water.
Q: Does this sensor work only if my container is clear?
A: No, the sensor is designed with very high excess gain to burn through many containers commonly used in consumer goods. The light from the sensorís emitter can burn through clear containers like glass or clear plastic easily. It can also burn through frosted glass bottles and some thin-walled plastic containers that are translucent but not totally opaque. The sensor doesnít work on cardboard boxes or metal cans, and a label on the side of a bottle may also interfere with the beam. When working with non-clear containers, some testing and application support may be required to apply the sensor successfully.