Ingersoll Rand "EA" series balancers are used for handling multiple (up to 3) loads within a 40 lb (18.1 kg) weight range without the need to adjust the controls.
When the pendant is in the LO- and UN-LOAD position, balancer air pressure is released to allow the lighter loads to be in balance. When the pendant is in the HI-LOAD position, no pressure is released, and the heaviest load can be balanced.
The "EA" series balancers are ideally suited for applications where up to 3 load sizes are frequently lifted, and operator hands-on the part is required. The UN-LOAD position is also often used for handling device balancing (loaded/unloaded).