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Chapter 3 Operation Figure 3-2. Switch Board Assembly SWITCH BOARD A rotary switch selects the Mechanical Relays on the Relay Board Assembly. The Rotary switch uses indented stops to select from zero, sample, and 5 span valves. A total of 13 LED’s are seated on the front panel. The three LED’s aligned horizontally at the bottom are not used for the dual probe configuration. The LED’s will only be used in the dual probe controller unit. 3-3
