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 deliver gaseous argon.
In terms of specific critical gases requirements, one attractive choice is the usage of 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 quite a bit lower when shipped to your facility in cryogenic liquid form in dewars. However, since these containers store the gas in the cryogenic form until it can be dispensed being a gas, there are two issues that can lessen the cost-effectiveness of utilizing this mode of supply.
Because the argon is saved in self-pressurizing containers with relief valves as well as the cryogenic liquid is boiling inside, reserve containers awaiting the primary container to empty on the system will, with time, build internal pressure up until the relief valve setting is reached and after that set out to vent excess gas at a rate of 2 to 3 percent every day. Here is 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 daily it sits in reserve. It wouldn’t take long to consume up whatever savings resulted from your lower unit cost.
Since the majority of the gas is at cryogenic form, the stress in the container is not going to indicate in the event the unit is full, half full or empty. The small liquid level indicators along with the dewars are hard to learn and not very accurate. As most gas distribution systems rely solely on pressure to alter from primary to reserve cylinders, false low-pressure readings may cause lab personnel to take out 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 figure out if your container is truly empty or contains residual product. IntelliSwitch II 538 Series is the latest inside the brand of computer-controlled gas distribution switchover systems using very accurate transducers to keep track of both primary and reserve inlet pressures. Proprietary software logic uses this data to drastically reduce evaporation loss by switching towards the reserve dewar to provide the gas to the instrument ahead of the relief valve opens, drawing down pressure from the container to your programmed point, and after that returning to the key dewar. This “economizer function” can virtually eliminate losses within the reserve LNG filling Station.
Additionally, when primary dewar pressure drops underneath the point from which the machine switches to the reserve, IntelliSwitch II is not going to immediately conclude that the container is empty. It waits a programmable period of time and while supplying the system through the reserve, watches the strain reading on the primary. In the event the pressure rises 46dexkpky the switchover reason for that time period, the pc concludes residual liquid was left inside the container and switches to it to offer the instrument. It does this repeatedly till the dewar fails to create pressure higher than the programmable switchover point, from which time that it switches towards the reserve, and sounds a security alarm to indicate the principal has become truly empty. This “look-back feature” reduces the residual discarded when using 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 fee savings of making use of Gas Cylinder to supply gas to ICP or ICP/Mass Specs.