| 摘要 |
A pair of probes is disposed in a pipe supplying water that has been treated to reduce inorganic solids to a selected level. A supply voltage is impressed across the probes to create a signal voltage that is a measurement of the ionization potential in the water between the probes. A dip switch and resistors of progressively different values are connected across the voltage source, and one switch of the dip switch is manually closed that represents the upper limit or range of desired dissolved solids. A signal voltage is created by the dip switch resistor, and the probe voltage and the dip switch voltage are supplied to an amplifier. If the difference on the two voltages is high, then a flip-flop energizes a red light indicating excessive solids; and if the difference is small, then the flip-flop energizes a green light showing an acceptable level of solids.
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