Maintenance Instructions for N-EVAP



December 27, 2023

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  • Maintenance Instructions for N-EVAP Like all laboratory equipment, it’s important to maintain your N-EVAP nitrogen evaporator to ensure it operates properly. By keeping up on regular cleaning and maintenance, your instrument should last you well over a decade. This video will go over how to maintain your N-EVAP’s stainless steel needles, water bath, air filter, and hoist assembly. Stainless steel needles should be washed and dried after each use to prevent contamination between sample batches. They can be cleaned by hand, or with common laboratory washers such as an ultrasonic cleaner, or autoclave. To wash them by hand, first wet a soft cloth or paper towel with acetone, ethanol, or THF. Wipe the entire exterior surface of the needle until all oils and residues are removed. Set aside and repeat on all needles. Then, fill a beaker or other container about halfway with a gentle cleaning solution. We will be using Liquinox in this video, but any non-alkaline detergent will do. Mount a needle on a 10-20 mL syringe and immerse the tip of the needle in the cleaning solution. Use the syringe to draw the solution through the needle until the syringe barrel is about half full. Then depress the plunger until all the solution is back in the beaker. Repeat this process about 3 or 4 times, and set the needle aside. Repeat until all needles have been cleaned. Discard the used cleaning solution. Rinse the beaker and needles with deionized water. Refill the beaker about half way with deionized water. Mount a needle on the clean syringe and repeat the same steps as with the solution. Once the needles are all rinsed, make sure they are completely dry before storing them or installing them back on the unit. Needles that are bent, clogged, or corroded should be replaced. If you’ve experienced any corrosion, consider using acid resistant needles. If you start to notice any rust or scale build-up on your bath, it can easily be removed using a gentle cleaner. Like with the needles, we will be using Liquinox but any non-alkaline detergent will work. For standard units, it’s best to use a non-abrasive scouring pad for scrubbing. For acid resistant units which will have a black Teflon coating in the bath, be sure to use a sponge or paper towel so you don’t chip the coating. To prevent any scale build-up from forming, we recommend emptying out the water bath when not in use. For dry bath N-EVAPs, there is no regular bath maintenance. You should only have to replace your beads in the case of a solvent spillage. If your evaporator is being used on a daily basis, it is recommended that you replace your air filter once per year. For lower-use applications, your filter can last you upwards of 5 years. You may need to replace it sooner if it becomes clogged, or if it’s been exposed to oil. The filter has an indicator that turns pink when contaminated with oil. If this happens, your gas source should be checked for contamination to prevent future issues. When working properly, the instrument should slide smoothly when being raised and lowered. If you’ve noticed that the hoist has a lot of resistance, there are a few things to check. Put your instrument all the way down and check the band springs for any damage or kinks that may cause resistance. Also check your center tube and rod for alignment. If the center tube is bent or lopsided, this will prevent the hoist from sliding smoothly. If both the band springs and center tube look good, try resetting the hoist alignment. To do this, slightly loosen all 8 screws on the hoist. Move the instrument up and down a few times to realign it. Retighten the screws while the instrument is in the fully upper position. Show the entire hoist assembly, go through steps to realign it. And that’s it! That’s everything you need to ensure your N-EVAP lasts you years down the road. For any questions or concerns about maintaining your unit, please contact our team at 978-838-7300 or Music from #Uppbeat (free for Creators!): License code: HG3LHIRG3CS7PB1U

    Analytical TechniquesChromatographyEnvironmental ScienceMass Spectrometry

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