Specifications

through the peep hole in the lamp door. Clean the optical filter and
thermocouple shield if a smoky flame has been encountered.
10. Calculation
10.1 Calculate the luminometer number of the test fuel as
follows:
Luminometer number 5
DT test fuel 2DT tetralin
DT isooctane 2DT tetralin
3 100 (1)
where the DT’s for the tetralin and isooctane are the average
values obtained at the rating level of tetralin.
11. Precision and Bias
9
11.1 The precision of this test method as determined by the
statistical examination of interlaboratory test results is as
follows.
11.1.1 Repeatability—The difference between successive
results obtained by the same operator with the same apparatus
under constant operating conditions would, in the long run, in
the normal and correct operation of the test method exceed the
following value only in one case in twenty.
Repeatability 5 6.1 luminometer numbers (2)
11.1.2 Reproducibility—The difference between two single
and independent results obtained by different operators work-
ing in different laboratories on identical test material would, in
the long run, exceed the following value only in one case in
twenty.
Reproducibility 5 8.8 luminometer numbers (3)
N
OTE 12—The preceding precision was obtained in a program using the
Luminometer made by ERDCO Engineering Corporation. Equipment not
equivalent to this apparatus can give results of different precision.
11.2 The precision of test method is not known to have been
obtained in accordance with currently accepted guidelines (for
example, in Committee D-2 Research Report RR:D02-1007,
“Manual of Determining Precision Data for ASTM Methods
and Petroleum Products and Lubricants.”
10
NOTE 13—Seven laboratories tested nine fuels varying in volatility and
luminometer rating. Seven were aviation fuels including fuels meeting
Specification D 1655, and two were gas turbine fuels (No. 1 and No. 2) as
designated in Specification D 2880, for Gas Turbine Fuel Oils. One
laboratory was excluded from analysis for failure to complete testing.
There was no significant variation in precision with luminometer rating
level.
11.3 Bias—The procedure in Test Method D 1740 has no
bias because the value of luminometer numbers can only be
determined in terms of the test method.
12. Keywords
12.1 aviation fuel; flame radiation; gas turbine distillate
fuels; luminometer number
ANNEX
(Mandatory Information)
A1. WARNING STATEMENTS
A1.1 Isooctane
Warning—Extremely flammable. Harmful if inhaled. Va-
pors may cause flash fire.
Keep away from heat, sparks, and open flame.
Keep container closed.
Use with adequate ventilation.
Avoid build-up of vapors and eliminate all sources of
ignition, especially nonexplosionproof electrical apparatus and
heaters.
Avoid prolonged breathing of vapor or spray mist.
9
Supporting data may be obtained from ASTM Headquarters. Request. RR:D02-
1180.
10
Annual Book of ASTM Standards, Vol 05.03.
Fuel Test Fuel
Luminometer No. 02L-1
Barometer, in. Hg 29.92
Wet bulb temperature 59°F (15°C)
Dry bulb temperature 77°F (25°C)
Background to be measured with sample holder
in lamp, no flame, door closed, and Luminometer
meter zeroed
0
Lamp temperature rise at rating level 349°F
FIG. 4 Lamp Temperature Rise at Rating Level of the Test Fuel
D1740–01
5