Specifications
6.1.3 A system to measure the lamp temperature rise above
ambient. Luminometers through serial No. 377 include a dual
thermocouple circuit and potentiometer, while later instru-
ments include a digital output unit.
6.2 Lamp Wicks—Standard ASTM smoke point lamp
wicks
5
are used in the ASTM-CRC luminometer lamp.
7. Reference Materials and Reagent
7.1 Isooctane (Warning—Extremely flammable. Harmful
if inhaled. Vapors may cause flash fire. See A1.1.) (2,2,4-
trimethyl pentane) ASTM reference grade conforming to the
following specifications:
Density at 20C, g/mL 0.69175 to 0.69205
Refractive index,
N
d
20 C
1.39135 to 1.39165
Freezing point, °C −107.52
Distillation:
Temperature at which 50 % is recovered, °C 99.20 to 99.30
7.2 Tetralin,(Warning—Combustible. Vapor harmful. In
animal tests, repeated oral or inhalation exposures caused liver
and kidney damage and the formation of eye cataracts. See
A1.2.) conforming to the following specifications:
Specific gravity 25/25 C 0.969 to 0.97
Refractive index,
N
d
20 C
1.5396 to 1.5410
Distillation, from first drop to dry, °C 206 to 208
7.3 Acetone, cp.(Warning—Flammable. See A1.3.)
7.4 Toluene, reagent grade,(Warning—Flammable. See
A1.4.)
7.5 Methanol, reagent grade,(Warning—Flammable. See
A1.5.)
8. Preparation of Apparatus
8.1 Cleaning the Lamp—Before each test, clean the top and
inside of the wick guide (in the lamp body) with acetone
(Warning—Extremely flammable. Vapors may cause flash
fire. See A1.3.) using a small test tube brush. Protect the optical
filter with a tissue during cleaning. Check the filter for spots
after cleaning and if the filter is found to be spotty, clean in
place with lens tissue. If necessary, the filter can be removed
for cleaning by first removing the lamp and then unscrewing
the filter retaining ring. Following the replacement of the lamp,
reference fuel checks should be made.
8.2 Wicks and Sample Holders—Only new wicks shall be
used. Extract all wicks for at least 25 cycles in a reflux
5
Standard smoke point wicks are obtainable through Erdco Engineering Corp.,
721 Custer Ave., PO Box 1310, Evanston, IL 60204 and Koehler Instrument Co.,
1579 Sycamore Ave., Bohemia, NY 11716.
FIG. 1 Diagram of ASTM-CRC Luminometer
D1740–01
2