Profile: Hansen Technologies Corp. designs and manufactures components for large industrial and commercial refrigeration systems. Our product line includes auto-purger, defrost controllers, float drainers, gas-powered valves, hand expansion valves, level pulse control system, oil temparature valves and pressure temparature transducer. Our level pulse control system is a pulse-width modulating system that modulates the flow of liquid to control liquid level, provides a uniform supply of makeup liquid.