| 摘要 |
<p>The pipe (10) has a connection line (14) connected with the pipe and comprising an outflow opening (12). A mass flow meter (16) i.e. sensor, is arranged in the connection line and/or in the outflow opening. The mass flow meter is connected with a computer (18). The computer computes a volume of flowing air in a level (20) of water (22) or a suspension (24) in a borehole (4), where the volume is determined by the mass flow meter. A non-return valve is arranged at an upper end of the pipe. The level is input as a threshold value in the computer for outputting an alarm signal. The computer is an electronic computing unit or a processor-controlled measuring device. An independent claim is also included for a method for measurement of water level in a borehole.</p> |
