To reduce 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 deliver gaseous argon.
In terms of specific critical gases requirements, one attractive choice is the usage of Lng vehicle cylinder, commonly called dewars, to supply gaseous argon to ICP and ICP/Mass Specs. Argon’s unit cost per cubic foot/gaseous liter is significantly lower when delivered to your facility in cryogenic liquid form in dewars. However, as these containers store the gas inside a cryogenic form until it really is dispensed being a gas, there are 2 issues that can decrease the cost-effectiveness of making use of this mode of supply.
Ever since the argon is saved in self-pressurizing containers with relief valves as well as the cryogenic liquid is boiling inside, reserve containers waiting for the primary container to empty with a system will, after a while, build internal pressure before the relief valve setting is reached and then commence to vent excess gas for a price of 2 to 3 percent daily. Here is the NER or Normal Evaporation Rate, referenced in the business since the “use it or lose it” phenomenon. At this particular rate, when 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 very long to nibble on up whatever savings resulted from the lower unit cost.
Since the majority of the gas is in cryogenic form, the stress from the container will not indicate in case the unit is full, half full or empty. The small liquid level indicators along with the dewars take time and effort to learn and not very accurate. Because most gas distribution systems rely solely on pressure to change from primary to reserve cylinders, false low-pressure readings can cause lab personnel to remove containers with as much as 25 percent 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 figure out if your container is actually empty or contains residual product. IntelliSwitch II 538 Series is definitely the latest inside 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 data to drastically reduce evaporation loss by switching for the reserve dewar to provide the gas for the instrument prior to the relief valve opens, drawing down pressure within the container to a programmed point, then 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 from which the device switches on the reserve, IntelliSwitch II is not going to immediately conclude that this container is empty. It waits a programmable length of time and while offering the system through the reserve, watches the pressure reading about the primary. If the pressure rises 46dexkpky the switchover part of that point period, the pc concludes residual liquid was left in the container and switches back to it to supply the instrument. It will this repeatedly until the dewar fails to develop pressure higher than the programmable switchover point, in 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 you use dewars to below 2 to 3 percent.
By reducing evaporation loss and decreasing the residual left in empty containers, CONCOA’s IntelliSwitch II optimizes the charge savings of employing CNG Trailer to offer gas to ICP or ICP/Mass Specs.