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Non-contact fluid sensors detect clear and opaque liquids

Non-contact fluid sensors detect clear and opaque liquids

New Products |
By eeNews Europe



This self-calibration feature makes the sensors well suited for medical equipment used to deliver IV fluids, transfusion/infusion systems, blood plasma and urine analysis; as well as precision industrial applications where tubing is used to deliver toner, lubricating oil, or other clear or coloured fluids.

The sensor operates with an infrared LED/phototransistor pair to determine the presence or absence of fluids in a tube that passes through the sensor housing, using the difference in refractive properties to vary the output current to signal different states, including "fluid present," "no fluid present," and "no tube present." It can also be used to identify the presence of air bubbles in the fluid passing through the tube.

The auto-calibration function enables the design engineer to narrow the device’s initial output state, which helps maintain consistent switching performance by compensating for several factors, including ambient light variation; LED/phototransistor performance degradation over time, overall system power variations; and fluctuations in ambient temperature.

The calibration settings are maintained, even if power is lost to the device, which enables faster start-up mode without the need for calibration each time the sensor is initiated. In addition, the sensor can be calibrated remotely before installation. The OCB350 Series devices include the sensor mounted on a PC board with an interface cable, and a series of coloured LEDs to indicate the various states of calibration. Custom PC boards can also be developed to meet customer requirements. The sensors are available to fit applications using clear tubing with outer diameters of 1.6-, 3.2-, 4.8- or 6.3-mm. Operating temperature range is from -40 to +85ºC.

Visit TT electronics Optoelectronic at www.optekinc.com

 

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