Request InfoAalborg Instruments & Controls Inc.Optical Sensor Switches from Aalborg Instruments & Controls Inc. noninvasively detect high- or low-flow rates that can damage equipment and processes. The devices are ideal for OEM applications and consist of a transmitter and receiver. They signal a cut-off valve, alarm or other device when the float passes above or below the desired setting. These versatile optical sensor switches can be used with the company’s P, S and T rotameters. The Hi-Lo Switch contains two sets of enhanced, self-contained mini-slim photoelectric sensors located on two solid carriers. 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