"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
"For my money, EST is the best in business when looking for products and support for your volatiles instrumentation needs." -Lab Manager MICHIGAN, 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
"EST offers some of the best VOA equipment." -Bench Chemist MINNESOTA, UNITED STATES
"The Centurion is extremely rugged and efficient." -Technical Director TEL AVIV, ISRAEL
" 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
Q. Why is the sample volume inconsistent when I check the vials in the tray after a Centurion sequence completes?
A. This is typically caused by the pressurization flow being too low (flow used to pressurize the vial and fill/transfer loop). The flow rate should be around 200mls/minute with the system pressure set at 14psi. The pressurization flow is controlled either by a miniature flow controller or a fixed flow restrictor based on the model & serial number of the Centurion:
Before serial number CENTW409 & CENTS229 = flow controller (adjust flow accordingly or replace w/fixed flow restrictor)
From serial number CENTW409 & CENTS229 = fixed flow restrictor (back sweep or replace)
Q. Why is the sparge tube not being rinsed? The correct sample volume is being delivered to the sparge tube but there's no rinse water being delivered
A. There may be an issue with the Centurion cold water (CW) valve and/or possibly a leak or restriction in the rinse/blank water flow path. Make sure there are no leaks at the blank water reservoir and the filter is not clogged on the end of the water pick-up lines (2) inside the reservoir. Please provide the Centurion serial number for tracking purposes and in order to confirm the system & plumbing configurations. In the meantime, I have attached the most recent flow diagrams for both the CenturionW & WS for your reference. Also, the cold water valve may be easily by-passed for trouble shooting purposes if this is something you are comfortable doing yourself. First, you will need to turn the pressure switch off and vent the blank water reservoir. Next, remove the blank water line from the center of the sample manifold. Then, the hot water pick-up line may be disconnected from the Centurion rear panel bulkhead and connected to the blank water port of the sample manifold in place of the blank water line that was previously removed. Now the cold water valve and hot water heater are by-passed. The pressure switch may be turned on and proceed with testing the rinse function from the Diagnostics screen/Manual Function/Rinse/Syringe.
*Note: this is for trouble shooting purposes only, cold water is no longer available (can't run soils) as the cold water valve tubing is disconnected (leak).
Q. I've noticed that the Centurion is not adding exactly 5uL (or 1uL, depending on how your method is configured), is there a way to adjust how much IS the Centurion adds to the sample?
A. There are 2 ways to do this, based off when your Centurion WS was manufactured.
If the serial number is < CENTS200 (the rest of the numbers, you can ignore. They are the manufacture date), then there is a small board with 3 trim pot valves marked R2, R5, and R12 located under the back panel of the instrument. By turning the potentiometers on these valves, you can adjust the amount of IS that is added. R2 corresponds to the IS1 valve, R5 corresponds to IS2, and R12 corresponds to IS3. Turning the valves counterclockwise will add less IS and turning them clockwise will add more. You can use a small flathead screwdriver to give yourself better control while you make your adjustments.
If your serial number is > CENTS200, there is an IS calibration option in the “diagnostics” section. Go there and click on the “calibration” button and choose “Internal Standard”. Then choose “calibrate”. There is a dropdown box next to each IS valve that lets you choose a time in milliseconds. If you are adding too much IS, you can lower that time by a millisecond or two and see if that improves your results. Do not lower the time below 5 milliseconds. If it looks like you need to go lower than 5 ms, you can decrease your Centurion system pressure by 1-2 psi (down to 12 psi), which will cause less IS to be added.
Stay EPA purge and trap method compliant with the time tested, Centurion Purge and Trap Autosampler. Enjoy the benefits of increased sample throughput, instrument reliability, and optimized sample preps. Maximize your productivity and profitability, while easily operating from any PC in your lab with the EST Analytical Centurion water/soil or water only autosampler.
Perform EPA methods 8260, 524, 624 with minimal carry over
< 3% RSD programmable internal standard compared to 10% by other purge and trap autosamplers
Separate water and soil needles to eliminate cross-contamination
Programmable Hot water rinses in between samples
Programmable soil needle depth to avoid clogging
“The Centurion is extremely rugged and efficient.” -Technical Director TEL AVIV, ISRAEL
Lost vial errors are eliminated when processing water samples by eliminating the need to move the vial to a processing station. The needle enters the sample and gas is pushed into the vial, forcing sample out into a fixed loop made of inert Peek™ material. Sample processing and rinses are over 3 times faster than other systems. Various sample sized loops are available, but 5ml is standard. All needles and tubing are large diameter to handle particulate laden samples easily. Internal standard is added to the sample and the sample is then pushed over to the sparge vessel mounted on the purge and trap concentrator. Multiple samples can be extracted from a single sample vial. Sample integrity is maintained since the needle remains in the vial until sampling for both runs is complete. After processing, the sample needle is rinsed with hot water. When the concentrator is done purging, the sample is automatically drained, and the Centurion will rinse all lines and the purging vessel with hot water. This rinse can be repeated a programmable number of times.
“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 Science BRISTOL, UNITED KINGDOM
The Centurion purge and trap autosampler holds up to 100 water and 90 soil samples
Dual mode allows two concentrators to hook up to one Centurion and one GC
Optical sensors eliminate lost vial, syringe home, and elevator not home errors commonly found in older purge & trap autosamplers
Unique software (patent pending) enables labs to run waters as soils to save time through a single calibration
Due to improvements in column technology, EPA Methods such as 8260 can now be performed in about 10 minutes without sacrificing chromatographic resolution. The purge and trap cycle time has become the limiting factor to sample throughput. EST Analytical is the leading innovator in supplying several high throughput VOC solutions to environmental laboratories. The key to any of EST Analytical’s high throughput configurations is that NONE of the traditional parameters need to be altered from the recommended or stipulated parameters in EPA methodologies.
“For my money, EST is the best in business when looking for products and support for your volatiles instrumentation needs.” -Lab Manager MICHIGAN, UNITED STATES
Only the Centurion series Purge and Trap Autosampler offers a built-in option which allows the autosampler to connect and control two different purge and trap concentrators. When connected to a single GC/MS, you can improve your VOC throughput up to 80 to 100 runs per day! This is equivalent to two or more conventional systems at a fraction of the cost. All sequencing is controlled by the Centurion autosampler. GC and concentrator signals are tracked to ensure nothing gets out of sequence.
user friendly interface
Intuitive software made for the end user
Ability to “Rush” samples to the front
Up to 400:1 dilutions
Check on samples from any location!
The Centurion series offers a unique interface that allows the user to easily perform diagnostics and set up sequences, as well as save and load methods. The Centurion, if placed on the company network, can be operated from any PC within the laboratory. Sequences can be created with just a couple of mouse clicks.The Centurion software also incorporates a RunLog that records samples run and any errors encountered. The log can be printed or saved for later review.