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Method for operating a non-contact ultrasonic or radar level gauge and non-contact ultrasonic or radar level gauge
Method for operating a non-contact ultrasonic or radar level gauge and non-contact ultrasonic or radar level gauge
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机译:非接触式超声波或雷达液位计的操作方法以及非接触式超声波或雷达液位计
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摘要
Method (1) for operating a non-contact ultrasound or radar level gauge (2) with at least one free-radiating transmitter (3), at least one receiver (5) and at least one evaluation unit (8) comprising the following steps: Emitting (100) a transmission signal (4) by the transmitter (3), Receiving (101) a reflection signal (7) reflected by a reflector (6) by the receiver (5), Evaluating (102) the transmission signal (4) and / or the reflection signal (7) by the evaluation unit (8), characterized, in that the evaluation unit (8) detects (103) a frequency shift between the transmission signal (4) and the reflection signal (103) and, by evaluating the determined frequency shift or a variable derived from the determined frequency shift, detects a filling process (104) in which a filling flow ( 9) at least partially passes through the transmission signal (4), wherein the evaluation unit (8) determines the reflector speed (105) from the determined frequency shift and detects the filling process by a comparison (106) of the reflector speed with a defined speed limit value.
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