Design of an Instrument for Liquid Level Measurement and Concentration Analysis Using Multisensor Data Fusion

Table 2

Output of capacitance level sensor for variation of solution concentration.

Case 1: plain solution
Change in liquid level (in m)	Sensor output (nF)	Timer output (MHz)	Frequency to voltage converter output (V)
0.10	17.05	26.3	0.1
0.20	27.29	16.2	0.156
0.30	39.99	11.0	0.204
0.40	51.64	8.5	0.264
0.50	63.2	6.8	0.314
Case 2: 10% concentrated sugar solution
Change in liquid level (in m)	Sensor output (nF)	Timer output (kHz)	Frequency to voltage converter output (V)
0.10	16.22	26.8	0.093
0.20	26.1	16.6	0.15
0.30	38.36	11.3	0.203
0.40	49.61	8.8	0.265
0.50	61.1	7.1	0.324
Case 3: 20% concentrated sugar solution
Change in liquid level (in m)	Sensor output (nF)	Timer output (kHz)	Frequency to voltage converter output (V)
0.10	16.01	27.1	0.106
0.20	25.5	17.0	0.148
0.30	37.27	11.7	0.216
0.40	48.08	9.0	0.277
0.50	58.7	7.3	0.336
Case 4: 30% concentrated sugar solution
Change in liquid level (in m)	Sensor output (F)	Timer output (kHz)	Frequency to voltage converter output (V)
0.10	14.48	30.2	0.110
0.20	23.32	18.5	0.173
0.30	34.63	12.5	0.227
0.40	44.89	9.7	0.289
0.50	55.78	7.8	0.348