"We have been transitioning to the EST Evolution purge and traps for the past three years. Both the Centurion and the Evoution are robust, and highly productive instruments. EST has top notch service, and we have found them to be highly responsive and professional." -Lab Director PENNSYLVANIA, UNITED STATES
"I decided on the Evolution due to the ability to clean up between samples and reduce carryover." -Technical Director PENNSYLVANIA, UNITED STATES
"We have been very happy with the two Evolution/Centurion systems purchased from EST. Both are being used to perform volatile organic methods (624 and 8260). Since installation our productivity has increased over 20% for volatile soil and water analyses due to a reduction in the time from run to run. Along with the increased productivity has come better performance of our GC/MS systems which now require less maintenance and demonstrate improved stability.
On top of the instrument performance, the process from sales thru installation was fantastic. All of our needs have been met and support is available as needed. The EST staff have been great as well. In fact, we talk regularly about adding additional units for our other equipment." -Lab Director MARYLAND, UNITED STATES
" I feel it is important for my labs success to continue our business relationship. EST equipment is reliable, efficient and the guys back in Cincy are great to work with when you have an issue." -Lab Manager PENNSYLVANIA, UNITED STATES
"EST offers some of the best VOA equipment." -Bench Chemist MINNESOTA, UNITED STATES
"I like the idea of the 8 port valve for water management before getting to GC." -Municipal Lab OREGON, UNITED STATES
Q. WHY IS THE BACK PRESSURE READING ON THE EV HIGH (GREATER THAN 1.5PSI), AND THE PURGE FLOW IS LOW ?
A. Restriction in the vent line restrictor. Please remove from vent valve and clip some tubing off then reinstall.
Q. WHAT CAUSES THE BACK PRESSURE TO INCREASE IN THE EVOLUTION?
A. This indicates there is either an increase in flow (least likely) or an obstruction (most likely) somewhere in the the sample pathway preventing the flow from exiting the vent/increasing back pressure.
Some possible causes for an increase in flow include; faulty proportioning valve not controlling properly, back-flush valve (SV4) leaking across ports.
Some possible causes for an obstruction include; vent line restrictor tubing (0.015 ID), vent valve (SV3), bake valve (SV6), and/or obstruction/clog in the manifold.
*The most common cause is due to an obstruction in the vent line tubing (connects the vent valve to the vent bulkhead) and there is an easy way to troubleshoot it. Start by disconnecting vent line tubing from the vent valve. Then check to see if the back pressure decreases with the tubing removed. If so, the restrictor tubing is clogged and should be replaced. Or you may try cutting 1-2 inches off the end of the tubing that was removed from the vent valve in an effort to remove/free the clog.
Q. The Evolution is showing an error message that states there is a heater fault, then asks to re-enable MCR. Is there anything I can do, or does this require repair?
A. The MCR that was referenced is the relay that controls power to all of our heaters. This MCR requires a proper chain of commands to be sent in order for it to function properly. Sometimes, if the Evolution is powered off and then back on, the MCR command chain can be sent improperly upon boot-up. My recommendation would be to power the Evolution down completely (exit the application, click on “start”, choose “shut down”, then when it tells you it is OK to power off instrument, flip the switch on the back). Let the Evolution rest for a minute, then flip the switch back on. Wait until the windows desktop screen boots up, and give the instrument a minute after you see the desktop screen load (the MCR commands for some versions of software are sent at this time). After waiting one minute, click on the EV application to load the software. Does the error message re-appear? If not, then the initial error was probably caused by the instrument losing power and not having the proper boot-up commands sent.If the error persists after you power cycle the instrument, you need to note the EXACT wording of the error message. There are multiple heaters in the Evolution, and the specific heater should be referenced in the error message. The heaters will be either Trap heater, Trap line heater, MoRT heater, MoRT line heater, Valve oven heater, Transfer line heater, or Sample heater. If the error persists after power cycling, there is most likely a defective heater or electrical relay that causing the heater to either not heat or heat too quickly. If this is the case, you should call Technical Support at 1-888-890-1404 (option 1) and we will help you troubleshoot the possible causes of this error.
The Evolution Purge and Trap Concentrator was designed from the beginning with the user in mind. The system needed to provide high productivity, stability, reliability and fast maintenance to meet the needs of today’s laboratory for the concentration of volatile organic compounds (VOCs).
UNPARALLELED STABILITY AND MOISTURE CONTROL
Perform EPA methods 8260, 524.2, 524.3, 524.4, 624, BTEX, GRO, DRO with reduced carry over
The Evolution is the ONLY purge and trap concentrator on the market designed to remove water during the purge process NOT during desorb and eliminates samples from being overexposed to moisture.
"We have been transitioning to the EST Evolution purge and traps for the past three years. Both the Centurion and the Evoution are robust, and highly productive instruments. EST has top notch service, and we have found them to be highly responsive and professional."-Select ScienceBRISTOL, UNITED KINGDOM
As detection limits have been pushed lower, and Mass Spectrometer systems more sensitive, moisture control is key to the overall stability of the complete system. Other systems collect the analytes and water on the analytical trap, then, during desorb, the sample flows through a moisture removal system on the way to the GC. When evaluating these systems, one problem became quickly apparent. If you are going to remove moisture during the desorption step when your flow is controlled by the GC, the effectiveness of this design will be determined by many different factors.
"I decided on the Evolution due to the ability to clean up between samples and reduce carryover."-Technical DirectorPENNSYLVANIA, UNITED STATES
EPA methods require you to purge between 40-50ml/min of flow. As you purge, the water and VOCs travel through a Moisture Reduction Trap (MoRT) on the way to the analytical trap. This prevents a large amount of moisture from contacing the analytical trap. By using an 8-port valve instead of a 6-port valve, the sample during desorption goes directly to the GC. In other systems the sample flows through a moisture system during this step. This creates a lot of extra volume in the desorption pathway, allowing peaks to broaden, sacrificing peak resolution.
MAXIMIZE PRODUCTIVITY AND REDUCE CARRYOVER
The Evolution is the ONLY purge and trap concentrator with a patented process that separates bake flows ensuring the lowest carryover available.
The Evolution offers Faster cycle times as achieved with cool-down times of less than 2 minutes.
The Evolution has an automated ready signal during bake to reduce cycle time by several minutes per sample.
Exclusive 3 year warranty on electronic boards.
EST Analytical patented a process on the Evolution where there are two flows that go through the system during bake; one flow is directed across the trap and another separate flow goes through the glassware. Other systems actually have the bake flow travel through the trap then through the cold glassware, depositing heavy compounds on the cold glassware surface to be seen on subsequent runs. By separating the flows, the Evolution avoids this problem and by heating the sparger vessel (optional) up to 125 °C during the bake sequence, carryover is reduced dramatically.
"I feel it is important for my labs success to continue our business relationship. EST equipment is reliable, efficient and the guys back in Cincy are great to work with when you have an issue."-Lab ManagerPENNSYLVANIA, UNITED STATES
user friendly interface
The Evolution comes standard with a 25cm touchscreen display. As laboratory networks have grown, there is a tendency to have the PC controlling the system further away from the actual instrument. By allowing the user to have control at the instrument, changes and troubleshooting are easier and faster to perform.