Rod isolation check method using voltage divider
AssigneeDust Company, Inc.
InventorFrederick E. Frantz
Life of this patent
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Abstract
A method of measuring impedance, includes: providing an input voltage (Vin) across an impedance determination circuit comprising a first resistance (R1) and a known second resistance (R2) connected in series, the first resistance being switchable between a known first resistance and a dust build up resistance between a dust sensor and a process wall; switching the first resistance to the dust build up resistance; measuring an output voltage (Vo) across the second resistance or the dust build up resistance; and determining the dust build up resistance based on Vin, Vo, and R2.
Claims10
A method of measuring impedance, comprising:
- providing an input voltage (Vin) across an impedance determination circuit comprising a first resistance (R1) and a known second resistance (R2) connected in series, the first resistance being switchable between a known first resistance and a dust build up resistance between a dust sensor and a process wall;
- switching the first resistance to the dust build up resistance;
- measuring an output voltage (Vo) across the second resistance or the dust build up resistance;
- and
- determining the dust build up resistance based on Vin, Vo, and R2.
An impedance measurement circuit, comprising:
- a test circuit comprising a first resistance (R1) and a known second resistance (R2) connected in series;
- and
- a controller that is configured to switch the first resistance between a known first resistance and a dust build up resistance between a dust sensor and a process wall, to switch the first resistance to the dust build up resistance, to measure an output voltage (Vo) across the second resistance or the dust build up resistance;
- and to determine determining the dust build up resistance based on Vin, Vo, and R2.
Dependencies are inferred from the claim text.