G - Physics – 01 – L
Patent
G - Physics
01
L
G01L 9/00 (2006.01) B29B 7/76 (2006.01)
Patent
CA 2071020
ABSTRACT Malfunctions of plunger (15) in the mixhead (10) of a system for mixing a plurality of fluids such as polyol and isocyanate for the manufacture of polyurethane foam, which plunger induces variations in fluid pressures as the mixhead operates, are monitored by a method that includes the steps of measuring the upstream pressure of at least one fluid and generating a signal responsive thereto, and comparing the pressure responsive signal to a preselected pressure responsive signal and generating an alarm if the pressure responsive signal comparison falls outside preselected limits. A device for implementing such a method includes transducers (40,41) for measuring the pressure of at least one fluid and generating a signal responsive thereto, an alarm (44) for generating a malfunction alarm, and a circuit (43) for receiving the pressure responsive signal and comparing the pressure responsive signal to a preselected pressure responsive signal and generating an alarm signal if the pressure responsive signal comparison falls outside preselected limits.
Smart & Biggar
The Dow Chemical Company
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