Thermal conductivity probe for fluid identification

摘要: For use with a sonde adapted to be lowered into well borehole, the supports thermal conductivity probe response fluid conductivity. In preferred and illustrated embodiment, four leg resistor bridge circuit has two temperature-sensitive legs exposed fluid. addition, one such is positioned adjacent heater dissipating constant heat power. The remaining ambient incremental voltage varies temperature of fluid, but variations are compensated for by which causes nulling changes. transferred heated determines and, hence, in bore can measured.