| The
probe replaces the filler cap and contains one or two
LEDs to show the operator whether or not there is sufficient
acid in the battery. The LED is connected to the probe
shaft itself and to a place on the battery where a negative
voltage can be found. This is normally to the input
of an adjacent cell in the battery negative direction,
so the LED receives approximately 3 vdc.
When the operator observes a problem,
he knows that he still has about ½" of
acid over the plates, and should put the battery on
charge, then top off the cells with distilled water.
On
an Industrial battery with 12, 18 or 24 cells, a probe
on the center cell is usually sufficient because it
runs hotter than the others, so it loses water faster
by evaporation than the others. On a Deep Cycle 6
Volt battery, the center cell is selected. On an 8D,
Group 24 or Group 27 12 Volt battery usually the second
cell from the negative post is chosen. |
