| 摘要 |
<p>A device for measuring the level of a liquid in a tank comprises a plurality of resistive probes 10 disposed at successive levels on an insulating substrate 40, each probe having a temperature coefficient other than zero such that its resistance depends whether it is immersed to a greater or lesser extent in the liquid, and each probe being fed separately with electric current so that the voltage across it gives an indication of the extent to which it is immersed in the liquid. The voltage across the probes may be scanned and stored on energizing the probes, and then again after an interval. The ratio of voltages for any probe is indicative of the degree of immersion, and the corresponding value of liquid may be read from a read only memory and added to the readings for the other probes. <IMAGE></p> |
