MIL-PRF-38715B
3.3.4 Display The indicator shall show the chosen range of Lower Explosive Limit (LEL) on
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a display that is readable in full sunlight from a distance of no less than 70 inches. The display
shall show measured LEL percentages for the chosen gas and range on a scale.
3.3.5 Scale ranges The scales shall be either digital or analog. The range of the combustible
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gas scale shall be 0 to 50 percent(%) LEL and 0 to 5% LEL. It shall consist of 50 scale divisions
with figures at the 0, 10, 20, 30, 40, and 50% graduations. The 0 to 5% LEL scale shall use the
same divisions as the 0 to 50% LEL scale with 1% corresponding to the 10% figure on the 0-50%
scale, 2% corresponding to 20%, etc. The range of the oxygen scale shall be 0-25%. It shall
consist of 25 equal scale divisions with figures at 0, 5, 10, 15, 20 and 25% graduations. The scale
division requirement applies only when analog scales are used. A switch shall be provided to
change the scale of the dual range combustible gas scale from 0-50% LEL to the 0-5% LEL scale,
or the indicator shall automatically switch scales. For digital indicators, the display shall be
rounded to the nearest 0.1% with .05% rounding up.
3.3.6 Construction. The indicator shall be capable of meeting all of the performance
requirements after exposure to normal handling, to include dropping from no more then 3 feet.
3.4 Performance characteristics
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3.4.1 Gas detection. The indicator shall detect explosive vapor or gases associated with fuel
oils or gasoline (including leaded gasoline), alcohol vapors, and hydrogen in mixtures with air. For
each of the following gases and/or vapors, the indicator shall automatically (within 5 seconds)
provide the true percent LEL after the user sets the gas selector switch to the appropriate gas.
a. Jet, rocket and reciprocating engine fuels:
(1) JP-4 (MIL-T-5624)
(2) JP-5 (MIL-T-5624)
(3) JP-8 (MIL-T-83133)
(4) PF-1
(5) JP-10 (MIL-P-87107)
(6) 4-Part Cleaner (MIL-C-38736)
(7) Aviation gasoline 100-130 octane
b. Ethyl alcohol
c. Hydrogen
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