To lower operational costs in today’s unstable economy, a lab or facility manager with a 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 supply gaseous argon to ICP and ICP/Mass Specs. Argon’s unit cost per cubic foot/gaseous liter is quite a bit lower when delivered to your facility in cryogenic liquid form in dewars. However, as these containers keep the gas inside a cryogenic form until it is actually dispensed as being a gas, there are two concerns that can decrease the cost-effectiveness of using this mode of supply.
Considering that the argon is stored in self-pressurizing containers with relief valves as well as the cryogenic liquid is boiling inside, reserve containers waiting for the principal container to empty on the system will, over time, build internal pressure till the relief valve setting is reached then set out to vent excess gas at a rate of 2 to 3 percent daily. This is the NER or Normal Evaporation Rate, referred to in the market because the “use it or lose it” phenomenon. At this rate, when 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 long to eat up whatever savings resulted through the lower unit cost.
Since the majority of the gas is cryogenic form, the strain from the container fails to indicate if the unit is full, half full or empty. The little liquid level indicators in addition to the dewars are hard to read instead of very accurate. As most gas distribution systems rely solely on pressure to alter from primary to reserve cylinders, false low-pressure readings might cause lab personnel to remove containers with around 25 % 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 find out when a container is truly empty or contains residual product. IntelliSwitch II 538 Series will be the latest from the type of computer-controlled gas distribution switchover systems using very accurate transducers to check both primary and reserve inlet pressures. Proprietary software logic uses this data to drastically reduce evaporation loss by switching for the reserve dewar to supply the gas to the instrument just before the relief valve opens, drawing down pressure from the container to some programmed point, after which going back to the main 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 device 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 even though supplying the system through the reserve, watches the strain reading about the primary. In the event the pressure rises 46dexkpky the switchover point in that point period, the pc concludes residual liquid was left from the container and switches returning to it to supply the instrument. It can this repeatedly until the dewar fails to create pressure on top of the programmable switchover point, where time that it switches for the reserve, and sounds a burglar alarm to indicate the principal is currently truly empty. This “look-back feature” reduces the residual discarded when utilizing dewars to less than 2 to 3 percent.
By reducing evaporation loss and lowering the residual left in empty containers, CONCOA’s IntelliSwitch II optimizes the cost savings of making use of CNG Trailer to deliver gas to ICP or ICP/Mass Specs.