Specific Gravity Testing - Crown C48-2+2 Owner's Manual And Service Manual

OPERATION AND SERVICE INFORMATION
Inspection
Batteries should be carefully inspected on a regular basis in order to detect and correct potential problems
before they can do harm. It is a great idea to start this routine when the batteries are first received.
Inspection Guildlines:
1. Examine the outside appearance of the battery.
◆ Look for cracks in the container.
◆ The top of the battery, posts, and connections should be clean, free of dirt, fluids, and corrosion.
◆ Repair or replace any damaged batteries.
2. Any fluids on or around the battery may be an indication that electrolyte spilling, leaching, or leaking out.
◆ Leaking batteries must be repaired or replaced.
3. Check all battery cables and their connections.
◆ Look closely for loose or damaged parts.
◆ Battery cables should be intact; broken or frayed cables can be extremely hazardous.
◆ Replace any cable that looks suspicious.
4. Tighten all wiring connections to the proper specification. Make certain there is good contact with the
terminals.
!WARNING !
◆ Do not smoke near batteries.
◆ Do not overtighten terminals. Doing so can result post breakage, post meltdown, or fire.

Specific Gravity Testing

1. Do not add water at this time.
2. Washing hydrometer with deionized water firstly。 ，
3. Fill and drain the hydrometer 2 to 4 times before pulling out a sample.
4. There should be enough sample electrolyte in the hydrometer to completely support the float.
5. Take a reading, record it, and return the electrolyte back to the cell.
6. Check electrolyte specific gravity for each cell, testing one cell g temperature by thermometer(often from
mid-cell) ；
7. Check all cells in the battery, repeating the steps above.
8. Replace the vent caps and wipe off any electrolyte that might have been spilled.
9.ρ25℃ = ρt +0.0007（t-25)
ρ25℃ ——25℃ electrolyte specific gravity ；
ρt ——t℃ electrolyte specific gravity.
10. Check the state of charge using Table on the next page.
The readings should be at or above the specification of 1.280±0.01g/cm3.
If any specific gravity readings register low, then follow the steps below:
1. Check and record voltage level(s).
2. Put battery(s) on a complete charge.
3. Take specific gravity readings again.
Owner's Manual and Service Guide
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