To reduce 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 provide gaseous argon.
When it comes to specific critical gases requirements, one attractive option is the usage of Air separation equipment, commonly called dewars, to deliver gaseous argon to ICP and ICP/Mass Specs. Argon’s unit cost per cubic foot/gaseous liter is a lot lower when sent 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 lessen the cost-effectiveness of making use of 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 awaiting the principal container to empty with a system will, over time, build internal pressure before the relief valve setting is reached then start to vent excess gas for a price of 2 to 3 percent every day. This is the NER or Normal Evaporation Rate, known as in the business because the “use it or lose it” phenomenon. At the rate, in the event the reserve cylinder of argon contains 4,500 cubic feet of gas, it equals losing 135 cubic feet daily it sits in reserve. It wouldn’t require much time to eat up whatever savings resulted from your lower unit cost.
Since the majority of the gas is cryogenic form, the strain in the container fails to indicate when the unit is full, half full or empty. The small liquid level indicators on the top of the dewars are hard to see instead of very accurate. Since most gas distribution systems rely solely on pressure to change from primary to reserve cylinders, false low-pressure readings might cause lab personnel to take out containers with as much as 25 % in the 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 a container is really empty or contains residual product. IntelliSwitch II 538 Series will be the latest from the line of computer-controlled gas distribution switchover systems using very accurate transducers to monitor both primary and reserve inlet pressures. Proprietary software logic uses this data to drastically reduce evaporation loss by switching for the reserve dewar to deliver the gas for the instrument just before the relief valve opens, drawing down pressure in the container into a programmed point, then returning to the primary dewar. This “economizer function” can virtually eliminate losses within the reserve Cryogenic Movable tank.
Additionally, when primary dewar pressure drops beneath the point where the program switches for the reserve, IntelliSwitch II does not immediately conclude that this container is empty. It waits a programmable period of time and even though supplying the system through the reserve, watches pressure reading about the primary. If the pressure rises 46dexkpky the switchover point in that time period, the pc concludes residual liquid was left inside the container and switches straight back to it to offer the instrument. It can this repeatedly before the dewar fails to construct pressure higher than the programmable switchover point, where time it switches for the reserve, and sounds a security alarm to indicate the principal has become truly empty. This “look-back feature” cuts down on the residual discarded when utilizing dewars to less than 2 to 3 percent.
By reducing evaporation loss and decreasing the residual left in empty containers, CONCOA’s IntelliSwitch II optimizes the fee savings of making use of CNG Trailer to provide gas to ICP or ICP/Mass Specs.