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These symbols in the technical data show the operating ranges of microsonic ultrasonic sensors.
The attenuation of sound in the air
depends on the temperature and pressure of the air as well as its relative humidity. The physical relationships are complex
and have different effects at different ultrasonic frequencies. For simplicity we can say that the attenuation in the air increases
with rising temperature and rising humidity. This necessitates a reduction in the size of the detection zones.
With a lower relative humidity and falling temperatures, the attenuation in the air decreases and the detection zones enlarge
accordingly.
The reduction in the size of the detection zone is essentially compensated for by the sensor's operating reserves. And at
temperatures below 0 °C some sensors can operate over distances certainly twice as large as those given here.
As the pressure of the air rises, so the attenuation in the air drops considerably. This aspect should be taken into account for
applications involving overpressure. Sound propagation is impossible in a vacuum.
0,15 m
20 mm blind zone
150 mm operating range
250 mm maximum range
f = 380 kHz, λ = 0.9 mm
Used in the following product groups:
zws ucs sks
0,24 m
50 mm blind zone
240 mm operating range
350 mm maximum range
f = 500 kHz, λ = 0.7 mm
Used in the following product groups:
zws ucs
::: Detection zones :::