MIL-DTL-25867D
3.3.10.2 Cover glass. The cover glass shall be in accordance with MS28105. The
thickness shall be the minimum practicable and suitable for the purpose.
3.3.10.3 Dial-to-cover glass distance. The distance between the inner surface of the
cover glass and the dial shall be the minimum practicable and shall not exceed 0.200 inch.
3.3.11 Reliability. The gage shall have a minimum mean-time-between-failures (MTBF)
of 2,000 hours based upon a discrimination ratio of 1.5 and a confidence factor of 90 percent
when tested as specified in 4.5.17.
3.4 Performance. The gage shall operate satisfactorily after subjection to the following
conditions:
a. Operating temperatures ranging from -54 ºC to 100 ºC (-65 ºF to 212 ºF) and non-operating
temperatures ranging from -65 ºC to 200 ºC (-85 ºF to 393 ºF).
b. Vibration of 30g from 5 Hz to 5,000 Hz.
c. Temperature-altitude-pressure altitude of 100,000 feet at -55 ºC (-67 ºF).
d. Exposure to salt sea atmosphere for 48 hours without evidence of corrosion or deterioration.
e. Relative humidity of 95 percent.
f. Fungus growth as encountered in tropical climates.
g. Exposure to dry dust-laden atmosphere.
h. Overpressure of 135 percent.
3.4.1 Tolerances. The gage shall operate within the tolerances specified in table II.
TABLE II. Scale error.
Tolerance ±PSI
Friction
High temp (71 ºC)
Applied
Room temp
error
low temp (-54 ºC)
test
after all
position
and after
Low temp exposure (-65 ºC)
Gage
pressure
tests except
error
overpressure and
and temp-alt high temp
type
PSI
endurance
leakage
endurance
exposure (200 ºC)
0
75
100
200
--
500
75
100
175
40
I
1,000
75
100
200
--
1,500
75
100
200
--
2,000
75
125
225
--
0
150
200
400
--
1,000
150
200
350
80
II
2,000
150
200
400
--
3,000
150
200
400
--
4,000
150
250
450
--
7
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business