Aktek ALIT-TIF Benutzerhandbuch - Seite 5

Blättern Sie online oder laden Sie pdf Benutzerhandbuch für Messgeräte Aktek ALIT-TIF herunter. Aktek ALIT-TIF 16 Seiten. Ultrasonic level meter

Aktek Endüstriyel Ekipman ve Enstrümantasyon Ltd. Şti

1.4 Measuring principle: Time-of-flight method

The sensor of the meter pulses in the direction of the product surface. There,

they are reflected back and received by the sensor. The meter measures the

time t between pulse transmission and reception. The meter uses the time t

(and the velocity of sound c) to calculate the distance D between the sensor

membrane and the product surface: D = c •t/2 . As the device knows the

empty distance H from a user entry, it can calculate the level as follows:

An integrated temperature sensor compensates for changes in the velocity of

sound caused by temperature changes. Calibration Enter the empty distance

H and the span F to calibrate the device.

Blanking distance: Span F may not extend into the blanking distance B.

Level echo from the blanking distance cannot be evaluated due to the

transient characteristics of the sensor.

h = H – d .

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H: installation height

d:distance value

h:level value

B:blacking distance

F:level full scale