APG MNU Slave Sensor user manual - Manual (Page 5)

Rev. B1, 5/13 MNU Series Ultrasonic Sensors
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Angle
The inclina! on of the object’s surface in rela! on to the sensor face will aff ect
the strength of the refl ected sound waves. Surfaces perpendicular to the
sensor will refl ect more signal directly back to the sensor. If a surface is more
than a few degrees off perpendicular, enough of the signal will be refl ected
away from the sensor that the target will not be detected. Generally speaking,
a target angle greater than 5 degrees off perpendicular will not be detected.
The target angle becomes increasingly cri! cal as the distance to the target
increases.
Environmental Condi! ons
Temperature, humidity, vapors, dust, and pressure can aff ect the sensor’s
performance. APG ultrasonic sensors are designed to compensate for many of
these condi! ons. However, if the condi! ons are extreme, sensor performance
can be degraded enough to require the use of a longer-range sensor than
normal condi! ons would require. Ultrasonic sensors may not be suitable for
applica! ons with heavy chemical vapors (such as solvents or gasoline), heavy
dust or when signifi cant surface foam is present.