A problem frequently presented to us by customers is the need to achieve a higher vaporized gas flow rate from the liquid vessels (similar to figure top right) on their manifold. Typical oxygen or nitrogen liquid vessels will provide between 300 to 400 SCFH per vessel through the Use or Gas valve when the pressure building circuit is open. The problem being presented is althoug
The system consists of a control unit, one bank of liquid vessel(s) (portable bulk, micro-bulk or bulk) which will serve as the primary bank (this has been hard-coded to be the left bank), a secondary bank (minimum of 3 cylinders) of high pressure cylinders and a third emergency reserve bank (minimum of 3 cylinders) of high pressure cylinders The logic gives preference to the liquid (left) bank, always reverting to the liquid (left) bank provided there is sufficient pressure.
A significant advancement has been achieved in medical gas alarms. Engineers and facilities now have a new option - master alarms which communicate with transducers. Why would a design engineer or a facility want to change to a transducer based master alarm? When you compare transducers and pressure switches, transducers inherently provide features and benefits not available in pressure switches:
Theory of Operation
Tri-Tech Medical LLU Series Manifold
Theory of Operation
A very expensive portion of the medical gas alarm system is the installation of hundreds or thousands of feet of low voltage wiring and conduit for the master and area alarms.
Hardly a week passes that we don’t receive a call from a plumbing or electrical contractor, facilities engineer or design engineer wherein they’ve confused transducers and pressure switches. True, both may be classified as sensors but they are vastly different in their functionality and the information and safety they provide. So, what is the difference?
You’re probably thinking that the cylinders connected to this manifold are gas, not liquid. If that’s what you’re thinking, you are incorrect. Don’t feel bad, most people are not aware that CO2 (carbon dioxide) and N2O (nitrous oxide) cylinders are filled (approximately 70%) with liquid. Because these cylinders contain liquefied gas and most all medical applications require gas, we are dependent on the liquid to boil or vaporize inside these cylinders at a rate sufficient to sustain the usage. How much gas can we withdraw from
Praxair Healthcare Services
55 Old Ridgebury Road
Danbury, CT 06810
Tel (800) 431-2460