The Maximum Range defines the farthest distance along the center line in a flame detector's FOV at which a fire can still be detected.
To change the units of the maximum range, click the word feet next to the Max. Range text box and a dropdown menu will appear, make sure feet is selected and enter a value of "200" in the Max. Range text box for your model and continue to the next section.
Tutorial 10 - Figure 02 - Maximum Range for a FOV, top view pictured