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为了便于在钻探施工中随时观察和掌握冲洗液的流量，我们试制了一台晶体管流量仪。该仪器是根据测量矩形堰的水头高度求得流量的方法，而将矩形堰的水头高度转换成电容量的大小，然后再将电容值通过电表显示。仪器附有报警装置，当冲洗液流量低于规定的某一值时，便自动发出讯响或灯光讯号。该仪器由一般电讯元件装置而成。具有材料易找、加工简便、成本低、使用方便等特点。适于自制。
In order to facilitate observing and mastering the flow rate of the flushing fluid at any time during drilling, we prototyped a transistor flow meter. The instrument is based on measuring the height of the head of the rectangular crucible to obtain the flow, and the height of the head of the rectangular crucible is converted into the size of the electric capacity, and then the capacitance value is displayed by the electric meter. The instrument is equipped with an alarm device. When the flow rate of the flushing fluid is lower than a specified value, it will automatically issue a beep or light signal. The instrument is made up of general telecommunications components. With the characteristics of easy-to-find materials, easy processing, low cost, easy to use and so on. Suitable for homemade.