Chemistry: electrical and wave energy – Processes and products
Patent
1984-08-28
1986-08-05
Tung, T.
Chemistry: electrical and wave energy
Processes and products
204400, 204416, 422 82, 7386434, G01N 2746
Patent
active
046041664
ABSTRACT:
Apparatus and a process for reducing peristaltic pump noise in a high impedance electrochemical measuring system by eliminating the noise at the pump source so as to minimize the effect of the noise on the precision and the response time of the measuring electrode. In a system having a high impedance measuring electrode connected to the elastomeric peristaltic tubing via a fluid conduit, a high impedance segment is disposed in the fluid conduit between the electrode and peristaltic tubing and means are disposed between the segment and peristaltic tubing for discharging the electrical noise generated by the action of the pump rollers over the peristaltic tubing. Preferably the discharging means is a conductive path electrically connected to an AC capacitive ground wherein the impedance of the capacitive ground is less than that of the segment. The segment may be a nonconductive liquid or gas such as air.
REFERENCES:
patent: 2563062 (1951-08-01), Perley
patent: 3471262 (1969-10-01), Hrdina
patent: 3840438 (1974-10-01), Ast et al.
patent: 4218197 (1980-08-01), Meyer et al.
patent: 4360415 (1982-11-01), Brezinski
patent: 4399362 (1983-08-01), Cormier et al.
Cormier Alan D.
Jones Ronald L.
Weinberg Melvin S.
Amdev, Inc.
Tung T.
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