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US 8,524,058 B2Granted
Low power amperometric probe
AssigneeSiemens Industry, Inc.
InventorMichael Brooks
Life of this patent
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Abstract
An amperometric probe suitable for monitoring chlorine levels in water is described. The probe has low power consumption and maintenance requirements rendering it particularly suitable for long periods of operation in remote locations with portable power supplies.
Claims18
An apparatus for determining the concentration of a species in a sample, the apparatus comprising:
- a probe having a reference electrode, a counter electrode, a working electrode and a thermistor;
- a bias voltage module including a voltage reference and a counter electrode drive amplifier, the bias voltage module arranged to provide a constant voltage between the reference electrode and the working electrode;
- a transimpedence amplifier arranged to produce a measured voltage as a measure of current flowing between the counter electrode and the working electrode;
- a temperature compensation amplifier arranged to adjust the measured voltage to produce a temperature corrected voltage in response to changes in the resistance of the thermistor;
- a fixed gain amplifier arranged to re-scale the temperature corrected voltage;
- the probe having a power consumption of about 428 μW when operated at 2.5V.
3 more elements
Dependencies are inferred from the claim text.