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SAFT AMERICA INC.
COMPONENT MAINTENANCE MANUAL
4579
24-31-05
PAGE 112
July 13/01
(5)
Verify the ohmmeter indicates 7355
Ω
±74
Ω
at 32°F ±3°F (0°C
±
1.5°C).
(6)
Following the low temperature test, slowly raise the temperature to 140°F
±5°F.
(7)
Verify the ohmmeter indicates 560
Ω
±12
Ω
at 140°F ±5°F.
NOTE:
At 160°F (71°C) the thermistor resistance shall be 382
±
74
Ω
.
(8)
If the thermistor fails any of the above tests, replace the temperature sensor
assembly (22) with a factory new.
K.
Overtemperature Thermoswitch
The overtemperature thermoswitch is part of the Temperature Sensor Assembly (22).
It is mounted on the plate (23) in contact with the face of cell #4. Disassembly is
required in order to test the thermoswitch (DISASSEMBLY). Check the function of
the overtemperature thermoswitch as follows:
(1)
Connect an ohmmeter to connector pins 8 and 9 of the temperature sensor
assembly (22). Ohmmeter should read >1M
Ω
(open thermoswitch contacts) at
room temperature [70°F (±5°F) (21.1°C (±2°C)].
(2)
Suspend the thermoswitch plate (23) with thermoswitch in a beaker of water
with the thermoswitch a minimum of 2 inches from the bottom and 1 inch
from the top of the water surface.
(3)
Insert a thermometer, or other suitable temperature-measuring device in the
water with the bulb adjacent to the thermoswitch.
(4)
Slowly raise the water temperature to 150°F (65.55°C) while observing the
ohmmeter (still connected to pins 8 and 9). Ohmmeter should read >1M
Ω
at
temperatures below 150°F (65.55°C).
(5)
Continue to raise the water temperature to 160°F (71.11°C) and allow the
temperature to stabilize at that temperature. The thermoswitch should close
(<1M
Ω
resistance) by the end of 5 minutes at a stabilized temperature of
160°F (71.11°C).
(6)
Slowly add cool water to the beaker to reduce the water temperature to 135°F
(57.22°C). The thermoswitch should open (>1M
Ω
) within 5 minutes at a
stabilized temperature of 135°F (57.22°C).
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