PERIODIC INSPECTION
4-30
CHECKING SPECIFIC GRAVITY OF ELECTROLYTE
Conversion table
Specic gravity at 20°C
Reading of hydrometer
Temperature °C
Use a hydrometer to measure the specific gravity of the
electrolyte.
If there is any variation among individual cell specic gravities, an
equalizing charge is required.
The normal specific gravity of electrolyte is 1.260 when the
temperature is 20°C. See the conversion table when the
temperature is other than 20°C.
For example, if the hydrometer reads 1.250 when the temperature
is 5°C, the specific gravity corresponding to the temperature of
20°C is 1.240. This value is lower than the specied value by 0.020.
In such a case, it is necessary to increase the specic gravity of
the electrolyte accordingly.
If the specic gravity of the electrolyte is very low, check the pole
plates and generator.
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