US 12,247,943 B2
Method to reduce unwanted signals on amperometric sensor response
Anna Farquhar, Auckland (NZ); Geoffrey Henshaw, Auckland (NZ); and David Williams, Kerikeri (NZ)
Assigned to AEROQUAL LTD., Auckland (NZ)
Filed by Aeroqual Ltd., Auckland (NZ)
Filed on Dec. 20, 2021, as Appl. No. 17/555,569.
Claims priority of provisional application 63/127,228, filed on Dec. 18, 2020.
Prior Publication US 2022/0196594 A1, Jun. 23, 2022
Int. Cl. G01N 27/403 (2006.01); G01N 27/404 (2006.01)
CPC G01N 27/404 (2013.01) [G01N 27/403 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An amperometric sensor comprising a potentiostatic circuit for an amperometric sensor that uses a resistor with, for a given set of environmental conditions, a resistance greater than 10% of a working electrode's Faradaic resistance in series with one or more electrodes and the electrodes' current sensing circuit;
wherein the working electrode's Faradaic resistance is equivalent to a resistance of a first resistor in parallel with a capacitor representing a double layer capacitance of the working electrode, wherein both the first resistor and the capacitor are in series with a second resistor representing the solution resistance; and
wherein the amperometric sensor comprises two working electrodes, each with a resistor between the electrode and the current sensing circuit with a resistance greater than 10% of the Faradaic resistance of the electrode the resistor is in series with.