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Rev. B2, 7/15 DCR-1006A Level Controller <br /> Angle <br /> The inclination of the object's surface in relation to the sensor face will affect <br /> the strength of the reflected sound waves. Surfaces perpendicular to the sensor <br /> will reflect more signal directly back to the sensor. If a surface is more than a <br /> few degrees off perpendicular, enough of the signal will be reflected away from <br /> the sensor that the target will not be detected. Generally speaking, a target <br /> angle greater than 5 degrees off perpendicular will not be detected. The target <br /> angle becomes increasingly critical as the distance to the target increases. <br /> Environmental Conditions <br /> Temperature, humidity, vapors, dust, and pressure can affect the sensor's <br /> performance. APG ultrasonic sensors are designed to compensate for many of <br /> these conditions. However, if the conditions are extreme, sensor performance <br /> can be degraded enough to require the use of a longer-range sensor than <br /> normal conditions would require. Ultrasonic sensors may not be suitable for <br /> applications with heavy chemical vapors (such as solvents or gasoline), heavy <br /> dust or when significant surface foam is present. <br /> A P ai� <br /> 5 <br />