Aktek ALIT-TIF Посібник користувача - Сторінка 5
Переглянути онлайн або завантажити pdf Посібник користувача для Вимірювальні прилади Aktek ALIT-TIF. Aktek ALIT-TIF 16 сторінок. Ultrasonic level meter
Друкувати сторінкуAktek 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