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 supply gaseous argon.
In terms of specific critical gases requirements, one attractive choice is the use of Cryogenic storage Dewar, commonly called dewars, to offer 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, since these containers store the gas in a cryogenic form until it is dispensed as being a gas, there are two issues that can lower the cost-effectiveness of utilizing this mode of supply.
Ever since the argon is held in self-pressurizing containers with relief valves along with the cryogenic liquid is boiling inside, reserve containers expecting the principal container to empty with a system will, over 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 every day. This is actually the NER or Normal Evaporation Rate, described in the market because the “use it or lose it” phenomenon. At the rate, in case the reserve cylinder of argon contains 4,500 cubic feet of gas, it equals losing 135 cubic feet each day it sits in reserve. It wouldn’t take very long to nibble on up whatever savings resulted from the lower unit cost.
Since a lot of the gas is cryogenic form, the stress from the container will not indicate in the event the unit is full, half full or empty. The small liquid level indicators on top of the dewars take time and effort to learn and not very accurate. Since the majority gas distribution systems rely solely on pressure to improve from primary to reserve cylinders, false low-pressure readings can cause lab personnel to eliminate containers with as much as 25 percent 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 determine if your container is definitely empty or contains residual product. IntelliSwitch II 538 Series is definitely the latest in the brand of computer-controlled gas distribution switchover systems using very accurate transducers to check both primary and reserve inlet pressures. Proprietary software logic uses this information to drastically reduce evaporation loss by switching on the reserve dewar to provide the gas for the instrument ahead of the relief valve opens, drawing down pressure inside the container to some programmed point, and after that going back to the main dewar. This “economizer function” can virtually eliminate losses from the reserve Cryogenic ISO Tank Container.
Additionally, when primary dewar pressure drops beneath the point where the system switches towards the reserve, IntelliSwitch II will not immediately conclude the container is empty. It waits a programmable length of time and while supplying the system in the reserve, watches the pressure reading around the primary. In the event the pressure rises 46dexkpky the switchover point in that period period, your computer concludes residual liquid was left inside the container and switches to it to provide the instrument. It will this repeatedly before the dewar fails to build pressure higher than the programmable switchover point, where time that it switches to the reserve, and sounds a burglar alarm to indicate the primary is now truly empty. This “look-back feature” reduces the residual discarded when working with dewars to lower than 2 to 3 percent.
Through the elimination of evaporation loss and reducing the residual left in empty containers, CONCOA’s IntelliSwitch II optimizes the cost savings of making use of Cryogenic Centrifugal Pump to provide gas to ICP or ICP/Mass Specs.