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The T-GAGE sensor is a passive, non-contacting, temperature-based device. It is used to detect object(s) that are either hotter or colder than the ambient condition, and then activate an output. While it looks and operates just like an Expert™ photoelectric sensor, the T-GAGE detects the infrared light energy emitted by objects, instead of its own emitted light. The sensor uses a thermopile detector, made up of multiple infrared-sensitive elements (thermocouples) to detect this infrared energy within its field of view.