Why is it necessary to limit how low an elevation angle a portable monitor device can be set to?

Setting a portable monitor device to an excessively low elevation angle can lead to instability due to the reactionary forces at play when water is discharged. When water exits the monitor, it generates a significant backward force that acts on the monitor itself. If the elevation angle is too low, this reactionary force may not be adequately countered by the weight and stability design of the monitor, leading to potential tipping or movement.

By limiting the elevation angle, the monitor is positioned in a way that allows it to handle the water's reactionary forces more effectively, ensuring it remains stable during operation. This crucial design consideration ensures both the safety of the personnel operating the monitor and the effectiveness of the fire suppression efforts.