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Drawing: ghosted arm component shows the cylinder mechanism inside the monitor arm
Some of our articulating lift arms have multiple capacity ranges. Generally, most of our lifting arms are offered with three cylinder options. The lifting arms will be otherwise exactly the same. Each individual monitor arm product page will detail the weight capacities of the arm. It is very important for the weight of the monitor(s) or device(s) to be attached to the arm be accurately weighed or verified (without stands or additional equipment attached) so that the correct arm capacity can be selected. If an arm is rated for 10 to 25 pounds and a monitor that actually weighs 8 pounds is attached, the arm will not lower and stay at the lowered position when released; it will simply float back up to its highest position. If the same arm is overburdened with a 27 pound monitor when only rated up to 25 pounds, then the arm will never suspend the payload without drifting slowly into the lowest position. If you have difficulty determining the weight of your monitor, touch screen, iMac, all-in-one computer or other device(s), contact Ergomart for assistance.
Gas spring cylinders lose a small amount of their lifting capacity over time and monitors may tend to sag after a year or two. In most cases, there is a simple solution: just follow the steps in the installation instructions to re-adjust the gas spring cylinder (generally once every three years). This will take less than 30 seconds and restore the arm to the same lifting strength as the day it was installed. It is always a good idea to keep the allen wrenches that come with the arms for this purpose.
Ergomart has a convenient video explaining how to set the arm strength when installing the monitor arm.