Storage and operating temperature.

Page Title: Storage and operating temperature.
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MIL-M-48640 (AR)

4.7.6

Interchangeability.

4.7.6.1 Interchangeability fixture. The ability to insert the

MBD into the test fixture P/N 9364930 barrel or gun tube confirm's

the interchangeability of the device.

4.7.7 Purging. This portion of the test shall be performed

utilizing dew point tester, Type 7000 or equivalent. The MBD shall

be purged with dry nitrogen for a period of time until it is

determined that the dew point is at least -25 degrees at atmospheric

pressure. Suitable valve adapters shall be used to facilitate this

test. The unit shall be sealed immediately after purging.

4.7.8 Sealing. This test shall be performed utilizing a

suitably calibrated pressure gage. Suitable valve adapters shall be

used to facilitate the test. Care will be utilized to keep the MBD

internal atmosphere purged. The MBD shall be pressurized with dry

nitrogen to 5 plus or minus .1 PSI for a minimum of one hour. There

shall be no evidence of leakage in excess of 0.1 PSI. Prior to

shipment, the unit will be sealed at a pressure of between 0.25 and

0.50 PSIG.

4.7.9 Environmental sampling. Three MBD's shall be selected at

random from each 50 produced, or from each month's production

whichever occurs first. Each sample shall meet the requirements and

tests in Table IV.

NOTES: Prior to environmental, the MBD shall have met the examination

and tests in Table II.

4.7.9.1 Storage and operating temperature. The test equipment

utilized in this test shall be in accordance with "Test Facilities"

requirements of MIL-F-13926. The uncased MBD shall be placed in the

test chamber and the temperature of the test chamber raised gradually

(rate of temperature change in the test chamber shall not exceed 10

degrees C per hour throughout the temperature cycling test) to 65

degrees C. The MBD shall remain at this temperature for a minimum

of three hours. At the completion of this period and while at 65

degrees C, the MBD locating block shall be depressed three times and

observed to return to its original position each time. Upon

completion of this test, the temperature of the test chamber shall

be gradually raised (see above rate of temperature change) to 7.1

degrees C.

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