Method and device for measuring levels

Details Method and device for measuring levels Method and device for measuring levels

2005-05-24

2005-05-24

Williams, Hezron (Department: 2856)

Measuring and testing

Liquid level or depth gauge

C073S29000R

Reexamination Certificate

active

06895814

ABSTRACT:
A level indicator emits measuring pulses (M) onto the surface (O) of a material (F) that is filled into a container, wherein second echo pulses (E2) are directly reflected at the surface of the material to the transmitting and receiving antenna (A) of the level indicator. Third echo pulses (E3) are reflected by the container wall (BW) and then to the transmitting and receiving antenna (A) due to diffuse reflection on the surface (O). First echo pulses (E1) are reflected at exposed parts, e.g., welding seams (SW) of the container wall (BW), to the transmitting and receiving antenna (A). The echo pulses (E1,E2,E3) received by the transmitting and receiving antenna (A) are low-pass filtered by means of a preferably digital low-pass filter (TP) and then evaluated in an evaluation unit (AW). Due to this low-pass filtering, the second and the third echo pulses (E2,E3) are combined into a single echo pulse (EV). The level indicator is particularly suitable for measuring the level (H) of pourable solids (F).

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