| 摘要 |
PURPOSE:To eliminate an error in measurement owing to a change in temp. by obtaining a liquid level from the value obtd. by dividing the decrease from the output when the output from a secondary coil at the measuring point is 0% liquid level by the change of the output from the secondary coil when the liquid level changes by 100%. CONSTITUTION:If the output es from a secondary coil 2 is expressed by the output eL from a lower reference coil 4 and the output eu from an upper reference coil 5, said output is es=N/nuXeu when the liquid level is 0%, es=N/nLXeL when the liquid level is >=100% and x=N/nuXeu-es/N/nuXeu- N/nLXeL when the liquid level is xX100%. The gain of the 1st amplifier 6 is set at A, the gain of the 2nd amplifier 7 at AN/nL and the gain of the 3rd amplifier 8 at AN/nu, respectively, and the x is determined by dividing the output from the 2nd subtractor 10 by the output from the 1st subtractor 9. |
