| 摘要 |
Invention applies to the field of measuring engineering and may be used for the measuring of liquid levels of normal and low electrical transmission capacities. The invention aims to increase the precision of measurement controlling the liquid level of the low electrical transmission capacity. The aim is achieved by the following arrangement: the device with a Nichrome string put in the middle of the metal case of insulators also has the second Nichrome string put in parallel to the first string and symmetrically towards the case. The top end of the first string is connected to the output of the permanent alternating-current generator, and the lower end of the second string is connected to the second output of an opposite phase of the permanent current generator. Both strings top and lower ends are connected to outputs of the relevant differential amplifier, the outputs of which are connected to a two input summing device. |
