To lessen operational costs in today’s unstable economy, a lab or facility manager with a brand new ICP/Mass Spec system must cost-effectively use cryogenic liquid argon dewars to offer gaseous argon.
In relation to specific critical gases requirements, one attractive choice is the usage of Lng vehicle cylinder, commonly called dewars, to supply gaseous argon to ICP and ICP/Mass Specs. Argon’s unit cost per cubic foot/gaseous liter is quite a bit lower when transported to your facility in cryogenic liquid form in dewars. However, because these containers keep the gas within a cryogenic form until it is actually dispensed like a gas, there are 2 issues that can lower the cost-effectiveness of using this mode of supply.
Because the argon is saved in self-pressurizing containers with relief valves along with the cryogenic liquid is boiling inside, reserve containers waiting for the primary container to empty on the system will, with time, build internal pressure before the relief valve setting is reached and then begin to vent excess gas for a price of 2 to 3 percent daily. This is basically the NER or Normal Evaporation Rate, described in the industry since the “use it or lose it” phenomenon. At this particular rate, in case the reserve cylinder of argon contains 4,500 cubic feet of gas, it equals losing 135 cubic feet every day it sits in reserve. It wouldn’t take very long to nibble on up whatever savings resulted in the lower unit cost.
Since many of the gas is within cryogenic form, pressure inside the container will not indicate if the unit is full, half full or empty. The little liquid level indicators on the top of the dewars are difficult to read instead of very accurate. Because most gas distribution systems rely solely on pressure to change from primary to reserve cylinders, false low-pressure readings might cause lab personnel to eliminate containers with around 25 % of your contents still inside.
Solution: CONCOA’s Intelligent Gas Distribution System IntelliSwitch II continuously monitors your reserve container’s pressure, using programmed software logic to figure out if your container is really empty or contains residual product. IntelliSwitch II 538 Series will be the latest in the type of computer-controlled gas distribution switchover systems using very accurate transducers to observe both primary and reserve inlet pressures. Proprietary software logic uses these details to drastically reduce evaporation loss by switching towards the reserve dewar to provide the gas on the instrument prior to the relief valve opens, drawing down pressure within the container into a programmed point, then returning to the key dewar. This “economizer function” can virtually eliminate losses from the reserve LNG filling Station.
Additionally, when primary dewar pressure drops below the point at which the system switches for the reserve, IntelliSwitch II will not immediately conclude that the container is empty. It waits a programmable timeframe and even though supplying the system through the reserve, watches the strain reading on the primary. In the event the pressure rises 46dexkpky the switchover reason for this time period, the computer concludes residual liquid was left within the container and switches back to it to provide the instrument. It can this repeatedly up until the dewar fails to create pressure on top of the programmable switchover point, where time it switches towards the reserve, and sounds a security alarm to indicate the key is currently truly empty. This “look-back feature” lessens the residual discarded when you use dewars to lower than 2 to 3 percent.
By eliminating evaporation loss and decreasing the residual left in empty containers, CONCOA’s IntelliSwitch II optimizes the price savings of utilizing CNG Trailer to supply gas to ICP or ICP/Mass Specs.