Chris Havel
Member
I am an Analytical Chemist working at the University of California San Francisco. We are currently funded by the FDA to study electronic cigarettes.
I have built an e-cigarette smoking machine that consists of a custom built controller that sends 12 V dc to a 3-way valve that directs a vacuum to the e-cigarette vaporizer and at the same time triggers a relay to direct the current from a constant voltage power supply to the coils in the vaporizer. The controller sends the 12 volt 4 second long pulse every 30 seconds to simulate e-cigarette smoking. The vapor is then collected in a series of gas washing bottles for chemical analysis.
I am looking for a better and cheaper controller. Does anybody know of an off the shelf controller that will deliver variable length pulses at variable timed intervals? Ideally, I would like to have 2, 3, 4, and 6 second long 12 volt pulses at 15, 30, 60 and 90 second intervals. It would be really great if there was a digital read out of the timing. I have attached a pictures of the smoking machine in action, the relay and the valve with the e-cigarette clearomizer attached.
I am using a 30 watt power supply to power the coil in the e-cigarette.
I have built an e-cigarette smoking machine that consists of a custom built controller that sends 12 V dc to a 3-way valve that directs a vacuum to the e-cigarette vaporizer and at the same time triggers a relay to direct the current from a constant voltage power supply to the coils in the vaporizer. The controller sends the 12 volt 4 second long pulse every 30 seconds to simulate e-cigarette smoking. The vapor is then collected in a series of gas washing bottles for chemical analysis.
I am looking for a better and cheaper controller. Does anybody know of an off the shelf controller that will deliver variable length pulses at variable timed intervals? Ideally, I would like to have 2, 3, 4, and 6 second long 12 volt pulses at 15, 30, 60 and 90 second intervals. It would be really great if there was a digital read out of the timing. I have attached a pictures of the smoking machine in action, the relay and the valve with the e-cigarette clearomizer attached.
I am using a 30 watt power supply to power the coil in the e-cigarette.