公开(公告)号：CA2211051A1

公开(公告)日：1998-08-19

申请号：CA2211051

申请日：1997-08-04

Applicant: ECOLAB INC

Inventor： BRADY DANIEL F ,  HENNEMANN THOMAS L

IPC: B67D3/02 ,  A47L15/44 ,  B01F3/08 ,  B01F15/02 ,  B01F15/04 ,  B67D7/74 ,  D06F39/02 ,  F16K37/00 ,  B67D5/56 ,  G01B7/30

Abstract: A dispensing system for dispensing chemical products to a plurality of utilization points utilizes a multi-port valve to selectively deliver use dilutions from a mixing apparatus to selected utilization points. The multi-port valve utilizes a position sensor to provide positive proof-of-delivery by detecting the angular position of a rotor relative to a stator in the valve. The position sensor includes opposing annular arrangements of detectable elements and proximity detectors which rotate relative to one another about a common axis in response to rotation of the rotor such that detectable elements are oriented in proximity to a unique combination of proximity detectors at each of a plurality of predetermined angular positions. As a result, unique codes are output from the proximity detectors to positively identify positioning of the rotor at the predetermined angular positions.