EP 1137931 A1 20011004 - VOLUME CHARGE DENSITY MEASURING SYSTEM
Title (en)
VOLUME CHARGE DENSITY MEASURING SYSTEM
Title (de)
MESSSYSTEM FÜR VOLUMENLADUNGSDICHTE
Title (fr)
SYSTEME DE MESURE DE DENSITE DE CHARGE VOLUMIQUE
Publication
Application
Priority
- US 9928693 W 19991203
- US 9825792 W 19981204
Abstract (en)
[origin: WO0034767A1] A capacitive sensor includes one or more chambers through which a material can flow. Two conductors are located to partially surround the flow chamber so that the material flows between the conductors. Where more than one chamber is used, additional conductors are provided. A measurement circuit connected to the conductors provides an output corresponding to a difference between test and reference frequencies. A display indicates the measured capacitance as a continuous-scale, proportional representation or a binary representation. The sensor system can measure volume charge density of a fluid or parameters responsive to changes in volume charge density, such as flow velocity.
IPC 1-7
IPC 8 full level
G01F 1/64 (2006.01); G01N 27/22 (2006.01)
CPC (source: EP)
G01F 1/64 (2013.01); G01N 27/221 (2013.01); G01N 27/226 (2013.01)
Citation (search report)
See references of WO 0034767A1
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
WO 0034767 A1 20000615; AU 1804599 A 20000626; AU 3109800 A 20000626; CA 2353457 A1 20000615; EG 22722 A 20030730; EP 1137931 A1 20011004; MX PA01005569 A 20030714; MX PA99006487 A 20040831; TW 460694 B 20011021; WO 0034794 A1 20000615; ZA 997357 B 20000601
DOCDB simple family (application)
US 9928693 W 19991203; AU 1804599 A 19981204; AU 3109800 A 19991203; CA 2353457 A 19991203; EG 154999 A 19991204; EP 99965113 A 19991203; MX 9906487 A 19981204; MX PA01005569 A 19991203; TW 88121885 A 19991214; US 9825792 W 19981204; ZA 997357 A 19991126