Gravity - UniCarriers FRSB14-8 Operation & Maintenance Manual

BATTERY ELECTROLYTE SPECIFIC BA TTERY ELECTROLYTE SPECIFIC

GRAVITY

GRAVITY
CONVERSION OF SPECIFIC GRAVITY AT CONVERSION OF SPECIFIC GRAVITY AT
VARIOUS TEMPERATURES VARIOUS TEMPERATURES
The specific gravity of battery electrolyte varies The specific gravity of battery electrolyte varies
with the temperature. To know the correct specic with the temperature. To know the correct specic
gravity of the electrolyte, you should measure gravity of the electrolyte, you should measure
the electrolyte temperature, too, and convert the the electrolyte temperature, too, and convert the
measured specific gravity into the value at the measured 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 in The standard specific gravity of the electrolyte in
a fully charged battery is 1.280 at the standard a fully charged battery is 1.280 at the standard
temperature of 20°C. temperature of 20°C.
CONVERSION TABLE CONVERSION TABLE
Example: Example:
Suppose the electrolyte temperature is 5°C and the Suppose the electrolyte temperature is 5°C and the
hydrometer reads 1.250. When converted into the hydrometer reads 1.250. When converted into the
specic gravity at 20°C, the gure is 1.240, 0.040 specic gravity at 20°C, the gure is 1.240, 0.040
lower than the standard value. Normal charge is lower than the standard value. Normal charge is
needed. needed.
BATTERY CARE BATTERY CARE
3-12 3-12
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How to read hydrometer How to read hydrometer
RUBBER BALL RUBBER BALL
HYDROMETER HYDROMETER
C C
° °
0 0
2 2
T T
A A
Y Y
T T
I I
V V
A A
R R
G G
C C
I I
F F
I I
C C
E E
P P
S S
TEMPERATURE °C TEMPERATURE °C
G G
N N
I I
D D
A A
E E
R R
R R
E E
T T
E E
M M
O O
R R
D D
Y Y
H H