Measurement of pH and specific ion concentration

Details Measurement of pH and specific ion concentration Measurement of pH and specific ion concentration

1990-02-20

1992-06-23

Wieder, Kenneth A.

Electricity: measuring and testing

Electrolyte properties

Using a ph determining device

324601, 324722, 324 74, 324130, 73 1R, G01R 3500

Patent

active

051246597

ABSTRACT:
A microprocessor-controlled pH and ion concentration meter is disclosed with improved testing procedures. The meter can be tested for excessive internal bias current by measuring the potential (V1) when the meter is connected to a circuit a known voltage (E1) of low impedance and the potential (V2) when the meter is connected to a circuit of the same voltage source (E1) but of known high impedance and having the meter compare (V2-V1) to a preset limit value. The meter can be tested for low internal impedance by further measuring the potential (V4) when the meter is connected to a circuit of a second external voltage (E2) and the known high impedance (R1). The meter then calculates:

REFERENCES:
patent: 4752740 (1988-06-01), Steininger
patent: 4799174 (1989-01-01), Kramer et al.
patent: 4841229 (1989-06-01), Eccleston
patent: 4912417 (1990-03-01), Gibboney et al.
patent: 4940946 (1990-07-01), Nazaryan

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