Flow through cell assembly

• US 4,036,722 A
• Filed: 08/21/1975
• Issued: 07/19/1977
• Est. Priority Date: 08/21/1975
• Status: Expired due to Term

• Current Assignee: Robertshaw Controls Company (Schneider Electric SE)
• Original Assignee: Robertshaw Controls Company (Schneider Electric SE)
• Inventors: Scott, Timothy F., Brushwyler, Gordon R.
• Primary Examiner(s): Kaplan, G. L.
• Application Number:
  US05/606,443
• Time in Patent Office: 698 Days
• Field of Search: 204/195 P, 204/195 B, 204/195 R, 204/195 M, 204/195 F, 204/195 G, 204/195 T, 204/195 S, 204/1, 324/29, 324/30 R, 324/30 B, 23/253 R
• US Class Current: 204/410
• CPC Class Codes: C10M 2203/00 Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
• CPC Class Codes: C10M 2205/173 used as base material
• CPC Class Codes: C10M 2207/022 containing at least two hydroxy groups
• CPC Class Codes: C10M 2207/023 having hydroxy groups bound to carbon atoms of six-membered aromatic rings
• CPC Class Codes: C10M 2207/026 with tertiary alkyl groups
• CPC Class Codes: C10M 2207/123 polycarboxylic
• CPC Class Codes: C10M 2207/129 having hydrocarbon chains of thirty or more carbon atoms
• CPC Class Codes: C10M 2207/22 Acids obtained from polymerised unsaturated acids
• CPC Class Codes: C10M 2207/281 of (cyclo)aliphatic monocarboxylic acids
• CPC Class Codes: C10M 2207/282 of (cyclo)aliphatic oolycarboxylic acids
• CPC Class Codes: C10M 2207/283 of polyhydroxy compounds
• CPC Class Codes: C10M 2207/284 of aromatic monocarboxylic acids
• CPC Class Codes: C10M 2207/285 of aromatic polycarboxylic acids
• CPC Class Codes: C10M 2207/286 of polymerised unsaturated acids
• CPC Class Codes: C10M 2207/288 containing free carboxyl groups
• CPC Class Codes: C10M 2207/289 containing free hydroxy groups
• CPC Class Codes: C10M 2207/34 Esters having a hydrocarbon substituent of thirty or more carbon atoms, e.g. substituted succinic acid derivatives
• CPC Class Codes: C10M 2207/40 Fatty vegetable or animal oils
• CPC Class Codes: C10M 2207/402 Castor oils
• CPC Class Codes: C10M 2207/404 obtained from genetically modified species
• CPC Class Codes: C10M 2209/00 : Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions oxidised hydrocarbons C10M2205/12
• CPC Class Codes: C10M 2209/02 : Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
• CPC Class Codes: C10M 2209/10 : Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
• CPC Class Codes: C10M 2209/101 : Condensation polymers of aldehydes or ketones and phenols, e.g. Also polyoxyalkylene ether derivatives thereof
• CPC Class Codes: C10M 2209/103 : Polyethers, i.e. containing di- or higher polyoxyalkylene groups
• CPC Class Codes: C10M 2209/104 : of alkylene oxides containing two carbon atoms only
• CPC Class Codes: C10M 2209/105 : of alkylene oxides containing three carbon atoms only
• CPC Class Codes: C10M 2209/106 : of alkylene oxides containing four carbon atoms only
• CPC Class Codes: C10M 2209/109 : esterified
• CPC Class Codes: C10M 2209/12 : Polysaccharides, e.g. cellulose, biopolymers
• CPC Class Codes: C10M 2211/044 : Acids; Salts or esters thereof
• CPC Class Codes: C10M 2211/06 : Perfluorinated compounds
• CPC Class Codes: C10M 2215/08 : Amides
• CPC Class Codes: C10M 2215/082 : containing hydroxyl groups; Alkoxylated derivatives
• CPC Class Codes: C10M 2215/202 : containing nitro groups
• CPC Class Codes: C10M 2215/28 : Amides; Imides
• CPC Class Codes: C10M 2219/082 : containing sulfur atoms bound to acyclic or cycloaliphatic carbon atoms
• CPC Class Codes: C10M 2221/02 : Macromolecular compounds obtained by reactions of monomers involving only carbon-to-carbon unsaturated bonds sulfurised polyolefins C10M2221/041
• CPC Class Codes: C10N 2060/04 : Oxidation, e.g. ozonisation
• CPC Class Codes: G01N 27/28 : Electrolytic cell components

Abstract

There is disclosed a flow through cell assembly that is particularly useful for housing of the sensing cathode of a dissolved oxygen cell. The flow through cell assembly supports the cathode of the dissolved oxygen cell adjacent the upper surface of a through passageway receiving flow of the liquid under investigation and includes a transversely positioned second probe that substantially blocks flow through the through passageway and provides an orifice area of restricted dimensions immediately beneath the dissolved oxygen probe. The dissolved oxygen probe is positioned substantially coplanar with the upper surface of the through passageway to avoid the formation of any air or gas pockets in the flow passageway which could cause erroneous indications on the dissolved oxygen probe. This also allows a high flow velocity across the sensor tip which permits lower volumetric flow rates and a proportionally greater sensitivity of continuous respirometer instrument utilizing the flow through cell assemblies.

Claims

1. In a continuous flow respirometer having an elongated residence tube, a metering pump to force a liquid therethrough at a constant flow rate, and dissolved oxygen cells to sense the oxygen content of the liquid entering and exiting said residence tube, the improvement comprising a cell assembly for a plurality of instrument probes, one each at the inlet and outlet of said residence tube, each assembly comprising:

a housing having a through passageway in open communication with said residence tube for transit of said stream of liquid;

a first transverse bore extending from the top surface of said housing and intersecting said through passageway;

a second transverse bore extending laterally from one side of said housing, intersecting said housing, intersecting said through passageway and perpendicular thereto;

a first instrument probe meter carrying the cathode of one of said dissolved oxygen cells and mounted in said first transverse bore and terminating generally coplanar with the top surface of said through passageway; and

a second instrument probe meter carried in said second transverse bore and extending transversely across said through passageway immediately beneath, but out of contact with, the lower end of said first instrument probe to block a substantial cross section of said through passageway and be in substantial flow obstruction to said through passageway and to define a narrow flow constriction there in immediately beneath said first probe meter.

2. The respirometer of claim 1 wherein said flow construction has a width from 0.05 to about 0.2 inch.

3. The respirometer of claim 1 wherein each of said second probe members is a temperature responsive element.

4. The respirometer of claim 3 wherein said temperature responsive elements are thermistors.