UniCarriers FRSB14-8 - Gravity

BATTERY CAREBATTERY CARE
3-123-12
BABATTERY ELECTROLYTE SPECIFICTTERY ELECTROLYTE SPECIFIC
GRAVITYGRAVITY
CONVERSION OF SPECIFIC GRAVITY ATCONVERSION OF SPECIFIC GRAVITY AT
VARIOUS TEMPERATURESVARIOUS TEMPERATURES
The specific gravity of battery electrolyte variesThe specific gravity of battery electrolyte varies
with the temperature. To know the correct specicwith the temperature. To know the correct specic
gravity of the electrolyte, you should measuregravity of the electrolyte, you should measure
the electrolyte temperature, too, and convert thethe electrolyte temperature, too, and convert the
measured specific gravity into the value at themeasured specific gravity into the value at the
standard temperature, using the conversion table.standard temperature, using the conversion table.
The standard specific gravity of the electrolyte inThe standard specific gravity of the electrolyte in
a fully charged battery is 1.280 at the standarda fully charged battery is 1.280 at the standard
temperature of 20°C.temperature of 20°C.
CONVERSION TABLECONVERSION TABLE
Example:Example:
Suppose the electrolyte temperature is 5°C and theSuppose the electrolyte temperature is 5°C and the
hydrometer reads 1.250. When converted into thehydrometer reads 1.250. When converted into the
specic gravity at 20°C, the gure is 1.240, 0.040specic gravity at 20°C, the gure is 1.240, 0.040
lower than the standard value. Normal charge islower than the standard value. Normal charge is
needed.needed.
How to read hydrometerHow to read hydrometer
RUBBER BALLRUBBER BALL
HYDROMETERHYDROMETER
TEMPERATURE °CTEMPERATURE °C
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FF
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22
00
°°
CC
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NN
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