By |December 10, 2018|Categories: Industrial Sensors, Knowledge Base|

Ultrasonic Sensor FAQ: Mounting Tips

In industrial plants, correct mounting is just as important as selecting the right sensor. We have answered some frequently asked customer questions below so that you can avoid incorrect measurement results in your plant.

1. What Factors Need to Be Considered When Mounting Ultrasonic Sensors in Parallel?

Minimum distances for mounting ultrasonic sensors in parallel

To prevent crosstalk, the minimum distances between ultrasonic sensors of the same type specified in the following illustrations must be observed. The specified values are intended as guidelines. They apply if the beam angles are aligned in parallel and the surfaces of the objects are at right angles to the beam angle axes. Otherwise, the required distance X must be determined through experimentation. This depends on the alignment, nature, and surface of the target objects being detected and located within the sound beam.

Minimum distances when mounting ultrasonic sensors opposite one another

The distances indicated below must be observed for opposite mounting. If faults occur, it may be necessary to increase the distance X or, where appropriate, activate the synchronization or multiplex function. Synchronized and non-synchronized ultrasonic sensors must not be mounted opposite one other.

2. Are Ultrasonic Sensors/Transducers Resistant to Chemicals?

From a chemical point of view, the ultrasonic transducer is usually the most critical component in ultrasonic sensors. Due to the materials used to manufacture standard ultrasonic transducers (hollow glass beads, epoxy resin, and PUR foam), these sensors have limited chemical resistance. If sensors are used in an environment with aggressive chemical substances (acids, alkalis, cleaning agents, etc.), ultrasonic sensors with a higher level of chemical resistance must be used. This is achieved by coating ultrasonic transducers with a PTFE film. These sensors usually have a housing made of high-quality stainless steel and are suitable for this type of application area.
If PTFE does not provide adequate protection against the chemicals used, hermetically sealed ultrasonic sensors in a fully stainless steel design are available, e.g. the UMC3000 or UMB800 series. For these models, the entire outer surface of the sensor is made of V4A stainless steel, which guarantees maximum chemical resistance.

Watch the video to find out more about the UMB800 series:

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