To lower 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.
When it comes to 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 a lot lower when shipped to your facility in cryogenic liquid form in dewars. However, because these containers store the gas inside a cryogenic form until it is actually dispensed as being a gas, there are two problems that can lower the cost-effectiveness of utilizing this mode of supply.
Considering that the argon is stored in self-pressurizing containers with relief valves and also the cryogenic liquid is boiling inside, reserve containers awaiting the primary container to empty with a system will, as time passes, build internal pressure until the relief valve setting is reached and then commence to vent excess gas for a price of 2 to 3 percent daily. This is basically the NER or Normal Evaporation Rate, known as in the marketplace as the “use it or lose it” phenomenon. Around this rate, in the event 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 long to nibble on up whatever savings resulted through the lower unit cost.
Since a lot of the gas is within cryogenic form, the pressure within the container does not indicate if the unit is full, half full or empty. The little liquid level indicators in addition to the dewars are difficult to read through and not very accurate. Since most gas distribution systems rely solely on pressure to improve from primary to reserve cylinders, false low-pressure readings may cause lab personnel to remove containers with around 25 % from 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 in case a container is definitely empty or contains residual product. IntelliSwitch II 538 Series is the latest from the type of computer-controlled gas distribution switchover systems using very accurate transducers to monitor both primary and reserve inlet pressures. Proprietary software logic uses this info to drastically reduce evaporation loss by switching to the reserve dewar to provide the gas on the instrument just before the relief valve opens, drawing down pressure from the container to your programmed point, and then returning to the principal dewar. This “economizer function” can virtually eliminate losses within the reserve Cryogenic Movable tank.
Additionally, when primary dewar pressure drops below the point in which the system switches on the reserve, IntelliSwitch II is not going to immediately conclude the container is empty. It waits a programmable amount of time even though offering the system from the reserve, watches the stress reading around the primary. When the pressure rises 46dexkpky the switchover reason for that point period, the computer concludes residual liquid was left inside the container and switches to it to provide the instrument. It can do this repeatedly until the dewar fails to construct pressure above the programmable switchover point, at which time it switches to the reserve, and sounds a burglar alarm to indicate the key is now truly empty. This “look-back feature” cuts down on the residual discarded when working with dewars to lower than 2 to 3 percent.
By eliminating evaporation loss and reducing the residual left in empty containers, CONCOA’s IntelliSwitch II optimizes the price savings of using Cryogenic Centrifugal Pump to offer gas to ICP or ICP/Mass Specs.