To reduce 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.
When it comes to specific critical gases requirements, one attractive choice is the use of Air separation equipment, 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 keep the gas within a cryogenic form until it can be dispensed as being a gas, the two main problems that can lessen the cost-effectiveness of making use of this mode of supply.
Since the argon is saved in self-pressurizing containers with relief valves and also the cryogenic liquid is boiling inside, reserve containers expecting the key container to empty on a system will, after a while, build internal pressure before the relief valve setting is reached and then set out to vent excess gas at a rate of 2 to 3 percent each day. This is actually the NER or Normal Evaporation Rate, referred to in the market because the “use it or lose it” phenomenon. At this rate, in case 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 enjoy up whatever savings resulted through the lower unit cost.
Since most of the gas is in cryogenic form, the stress in the container fails to indicate if the unit is full, half full or empty. The little liquid level indicators on the top of the dewars are hard to read through and not very accurate. Since the majority gas distribution systems rely solely on pressure to alter from primary to reserve cylinders, false low-pressure readings might cause lab personnel to take out containers with as much as 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 determine when a container is definitely empty or contains residual product. IntelliSwitch II 538 Series is definitely the latest from the brand of computer-controlled gas distribution switchover systems using very accurate transducers to check both primary and reserve inlet pressures. Proprietary software logic uses this information to drastically reduce evaporation loss by switching on the reserve dewar to supply the gas towards the instrument ahead of the relief valve opens, drawing down pressure from the container to some programmed point, then returning to the key dewar. This “economizer function” can virtually eliminate losses within the reserve Cryogenic Movable tank.
Additionally, when primary dewar pressure drops below 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 the reserve, watches the strain reading in the primary. If the pressure rises 46dexkpky the switchover point in that time period, the pc concludes residual liquid was left within the container and switches back to it to offer the instrument. It does this repeatedly until the dewar fails to develop pressure over the programmable switchover point, where time it switches to the reserve, and sounds a burglar alarm to indicate the principal is currently truly empty. This “look-back feature” decreases the residual discarded when utilizing dewars to lower than 2 to 3 percent.
Through the elimination of evaporation loss and lowering the residual left in empty containers, CONCOA’s IntelliSwitch II optimizes the cost savings of making use of Cryogenic Centrifugal Pump to provide gas to ICP or ICP/Mass Specs.