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 terms of specific critical gases requirements, one attractive option is the application of Air separation equipment, commonly called dewars, to provide 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 within a cryogenic form until it is actually dispensed like a gas, there are two conditions that can lessen the cost-effectiveness of making use of this mode of supply.
Ever since the argon is stored in self-pressurizing containers with relief valves along with the cryogenic liquid is boiling inside, reserve containers waiting around for the main container to empty on a system will, over time, build internal pressure till the relief valve setting is reached then commence to vent excess gas at a rate of 2 to 3 percent every day. This is basically the NER or Normal Evaporation Rate, known as in the business because the “use it or lose it” phenomenon. At this particular rate, in the event 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 require much time to enjoy up whatever savings resulted from your lower unit cost.
Since most of the gas is at cryogenic form, the strain inside the container will not indicate in case the unit is full, half full or empty. The little liquid level indicators on top of the dewars take time and effort to read through and not very accurate. As most gas distribution systems rely solely on pressure to improve from primary to reserve cylinders, false low-pressure readings may cause lab personnel to eliminate containers with as much as 25 percent of 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 in case a container is truly empty or contains residual product. IntelliSwitch II 538 Series will be the latest in the collection of computer-controlled gas distribution switchover systems using very accurate transducers to monitor both primary and reserve inlet pressures. Proprietary software logic uses these details to drastically reduce evaporation loss by switching towards the reserve dewar to offer the gas to the instrument just before the relief valve opens, drawing down pressure from the container to some programmed point, and after that going back to the principal dewar. This “economizer function” can virtually eliminate losses from the reserve Cryogenic Movable tank.
Additionally, when primary dewar pressure drops underneath the point where the machine switches for the reserve, IntelliSwitch II fails to immediately conclude how the container is empty. It waits a programmable amount of time even though supplying the system in the reserve, watches pressure reading in the primary. If the pressure rises 46dexkpky the switchover point in that time period, your computer concludes residual liquid was left from the container and switches back to it to supply the instrument. It does this repeatedly till the dewar fails to construct pressure higher than the programmable switchover point, from which time it switches towards the reserve, and sounds an alarm to indicate the main is now truly empty. This “look-back feature” reduces the residual discarded when utilizing dewars to below 2 to 3 percent.
Through the elimination of evaporation loss and reducing the residual left in empty containers, CONCOA’s IntelliSwitch II optimizes the fee savings of using Gas Cylinder to supply gas to ICP or ICP/Mass Specs.