To lessen operational costs in today’s unstable economy, a lab or facility manager with an all 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 option is using Cryogenic storage Dewar, commonly called dewars, to supply gaseous argon to ICP and ICP/Mass Specs. Argon’s unit cost per cubic foot/gaseous liter is much lower when delivered to your facility in cryogenic liquid form in dewars. However, as these containers keep the gas in the cryogenic form until it can be dispensed being a gas, the two main issues that can lower the cost-effectiveness of making use of this mode of supply.
Considering that the argon is held in self-pressurizing containers with relief valves and the cryogenic liquid is boiling inside, reserve containers waiting around for the main container to empty on a system will, with time, build internal pressure until the relief valve setting is reached after which start to vent excess gas for a price of 2 to 3 percent every day. This is actually the NER or Normal Evaporation Rate, referred to in the marketplace since the “use it or lose it” phenomenon. Around this rate, if 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 require much time to consume up whatever savings resulted from the lower unit cost.
Since a lot of the gas is in cryogenic form, the pressure within 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. Since the majority gas distribution systems rely solely on pressure to modify from primary to reserve cylinders, false low-pressure readings could cause lab personnel to remove containers with up to 25 % 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 find out when a container is actually empty or contains residual product. IntelliSwitch II 538 Series will be the latest inside 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 on the reserve dewar to provide the gas towards the instrument before the relief valve opens, drawing down pressure inside the container into a programmed point, and then going back to the main dewar. This “economizer function” can virtually eliminate losses inside the reserve LNG filling Station.
Additionally, when primary dewar pressure drops beneath the point from which the machine switches towards the reserve, IntelliSwitch II will not immediately conclude that the container is empty. It waits a programmable length of time and although offering the system from your reserve, watches the strain reading in the primary. When the pressure rises 46dexkpky the switchover point in that time period, your computer concludes residual liquid was left in the container and switches straight back to it to supply the instrument. It will this repeatedly until the dewar fails to build pressure higher than the programmable switchover point, in which time it switches to the reserve, and sounds a security alarm to indicate the key is already truly empty. This “look-back feature” lessens the residual discarded when using dewars to under 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 using Gas Cylinder to supply gas to ICP or ICP/Mass Specs.