A student the other day asked me the principle of operation of the Agilent HPLC leak sensors. Any one know how they work.
Mark！ I also want to know.
When a leak occurs, the leak sensor is cooled by the solvent. This changes the resistance of the leak sensor which is sensed by the leak- sensor circuit on the mainboard.
A PTC (positive temperature coefficient) resistor- or a thermistor is used- provides a signal to the board.
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