FAQ No. FAQ01290
Question
E4PA Ultrasonic Displacement Measuring Sensor A1 (power indicator,
green LED) and A2 (error indicator, red LED) indicators flash alternately
and the E4PA is not operating properly. What is causing this, and what can
we do to resolve the problem?
Answer
Cause:
1. The reflected sound wave is unstable.
2. The surface of the sensing object is not flat or the distance setting
is near the maximum rated detection distance.
Countermeasure:
1. Use the Sensor at a closer distance.
2. If you cannot move the Sensor any closer, use a Sensor that has a
longer detection distance. For example, if the Sensor that you are
currently using is the E4PA-LS400-M1 with a detection distance of 500 to
4,000 mm, then use a E4PA-LS600-M1 with detection distance of 800 to 6,000
mm instead.
Other Displacement Sensor FAQs
 How are the gain switch functions AUTO, METAL, WHITE, and BLACK used in a Reflective Sensor?
What is the chemical resistance of the E4PA?
At the maximum sensing distance of the E4PA, the output should be 20 mA but only 16 mA is output. What is causing this?
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