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FIGURE 1—TEST CHAMBER
3.5Smoking, open flames, unprotected lights, or other spark sources must not be permitted in the area during
精神病人管控措施testing.
3.6Full face protection devices must be worn by all persons within the restricted area.
3.7The battery spark source circuit must have an emergency disconnect switch to the testing personnel.
3.8The exhaust fan of the explosion test chamber should be operated during the entire spark test procedure. On
completion of any test quence, charging and sparking circuits into the explosion test chamber must have been interrupted for at least 5 min with the exhaust fan operating before anyone is permitted access to the chamber. This time interval allows any hydrogen to be purged from the chamber and to preclude the possibility of a delayed explosion occurring due to a sustained "hidden" flame.
WARNING—HYDROGEN GAS CAN BURN WITHOUT VISIBLE FLAME.
4.Equipment Required for Spark Test
4.1Where the spark test is to be conducted on a battery
4.1.1An explosion chamber, for example, Figure 1, with an explosion-proof fan of adequate size to produce
approximately one chamber volume change per minute, vented directly to the exterior of the building.
4.1.2 A battery-charging source capable of constant voltage or current control, with at least 40 A output at 17.5 V.
养胃吃什么水果4.1.3 A fully-charged 12-V battery to rve as an ignition source. This battery should be equipped with a
functional flame retardant venting system.
4.1.4Battery on which the test is to be performed.
4.1.5Wiring and fixture equivalent to tho shown in Figures 2A or 2B.
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FIGURE 2A—SCHEMA TIC FOR TEST ON BATTERY
FIGURE 2B—SCHEMA TIC FOR TEST ON BATTERY
4.2Where the spark test is to be conducted on a test fixture
4.2.1An explosion chamber, for example, Figure 1, with an explosion-proof exhaust fan of adequate size to
produce approximately one chamber volume change per minute, vented directly to the exterior of the building.
4.2.2 A charging source capable of constant voltage or current control, to be at least a 40 A output at 17.5 V.
4.2.3 A fully charged 12-V battery to rve as an ignition source. This battery should be equipped with a functional
flame retardant venting system.
4.2.4 A cond fully charged battery to rve as a gas mixture source. This battery must be vented only through
the test fixture or functional flame retardant venting system.
4.2.5 A test fixture, for example, Figure 3.
FIGURE 3—TEST FIXTURE
4.2.6Tubing and fittings equivalent to tho shown in Figure 4.
5.Equipment Arrangement and Spark Test Preparation
5.1Where the spark test is to be conducted on a battery:
5.1.1Arrange test apparatus as shown in Figure 2A or alternate 2B.
5.1.2Before spark testing, the test battery system should be checked for gas leakage at any place other than the
vent opening, for example, with a soap solution.
5.1.3Prior to the start of the test, the spark source battery must be fully charged.
5.1.4Prior to the start of the test, the battery to which the test vent is affixed must be fully charged and gassing
vigorously.
FIGURE 4—SCHEMA TIC FOR TEXT FIXTURE
5.1.5Prior to the start of the test, the test vent must be preconditioned as in
6.1.
5.2Where the spark test is to be conducted on the test fixture:
5.2.1Arrange the test apparatus as shown in Figure 4. Note that the gas inlet to the test fixture must be well below
the water level as shown in Figure 3 to prevent ignited gas from entering the gas-generating battery.
5.2.2Fill the test fixture with water to a level 3 mm (1/8 in) below the underside of the top. Place the hold-down
frame over a 1-mil thickness of polyethylene film cut as shown in Figure 3. Place the frame, with film in place, over the four studs so that the film covers the open area between the fixture and the frame. Tighten the frame down finger tight with wing nuts to insure a gas-tight al around the gasket. Fit the vent system to be tested into the fixture.
5.2.3Before spark testing, the whole system should be checked for gas leakage at any place other than the vent
opening, for example, with a soap solution.
5.2.4Prior to the start of the test, the spark source battery must be fully charged.
5.2.5Prior to the start of the test, the gas-generating battery must be fully charged and gassing vigorously.
5.2.6Prior to the start of the test, the test vent must be preconditioned as in
6.1.
6.Preconditioning the Vent System
6.1Standard Preconditioning—Preconditioning shall consist of subjecting the battery to which the venting
大腿英语system is attached to an overcharge of 2 to 4 A for a period of 16 to 24 h. This will put the vent syste
m in an acid moistened state as is typical of its in-rvice condition. The spark test shall be conducted within 1 h of completion of the preconditioning charge.
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6.2Hot and Cold Cycle Preconditioning (Optional)
6.2.1Place the vent system in a cold box at −29 °C (−20 °F) for 16 h.
白的成语6.2.2Remove from cold box and place it in an oven at 71 °C (160 °F) for 8 h.
6.2.3Repeat this quence for a total of 3 full cycles.
6.2.4At the completion of the third full cycle, condition the vent system as in 6.1.
7.Spark Test Procedure
7.1When the spark test is to be conducted on a battery:
7.1.1Spark testing is to be conducted at 25 °C ± 5 °C (77 °F ± 9 °F).
7.1.2Battery temperature should be 27 °C (80 °F).
7.1.3If the battery temperature is above 27 °C (80 °F), a voltage correction of −0.038 V/°C (−0.021 V/°F) for every
degree above 27 °C (80 °F) must be ud to guarantee an equivalent amount of gas generation.
7.1.4When the test battery is gassing vigorously, charge the battery at a potential of 2.92 V/cell. (Charging
current shall not exceed 40 A.)
7.1.5Allow the gas flow rate to stabilize. (Gas flow should stabilize in 1 to 5 min.)
7.1.6Create a spark of not less that 0.02 mJ of energy 1.3 cm (0.5 in) from the test vent opening in the path of the
gas flow.
7.1.7Repeat the spark at 10 s intervals for a minimum of 6 sparks per vent insuring that evolved gas are ignited.
(If the ignited evolved gas ignite the battery, time must be allowed for the battery to lf-extinguish or ignite the gas within the battery.)
7.1.8If the vent system is functioning properly, no gas ignition will occur within the test battery.
7.2Where the spark test is to be conducted on the test fixture:
7.2.1Spark testing is to be conducted at 25 °C ± 5 °C (77 °F ± 9 °F).
7.2.2Battery temperature is above 27 °C (80 °F).
好的晚安7.2.3If the battery temperature is above 27 °C (80 °F), a voltage correction of −0.038 V/°C (−0.021 V/°F) for every
degree above 27 °C (80 °F) must be ud to generate an equivalent amount of gas generation.
7.2.4When the gas generation battery is gassing vigorously, charge the battery at a potential of 2.92 V/cell.
(Charging current shall not exceed 40 A.)
