Specifications

ManualsBrandsWeed Eater ManualsTiller174096

place the sample holder in the lamp and light it (Warning—Do

not allow the ﬂame to come closer than

⁄

in. (3.2 mm) from

the thermocouple or the potentiometer (digital indicator-Serial

Nos. 378 or higher) to read 1000°F (538°C) or higher). If any

soot builds upon the thermocouple shield, put out the ﬂame,

clean the shield, lower the sample holder slightly and relight.

Through the observation peep hole in the center of the lamp

door note that the ﬂame is burning free of smoke (Note 7). Let

the tetralin burn at this level for 15 min to warm up the

apparatus.

NOTE 7—All ASTM-CRC Luminometers have been adjusted by the

manufacturer to read 45 to 55 at the smoke point of tetralin. If the unit is

outside this range, adjust the internal resistor located between the two

ampliﬁer tubes (remove the rear cover of the unit) until a meter reading of

45 is obtained.

9.2 After warmup, lower the sample holder until the lumi-

nometer meter indicates approximately 30. Rezero the lumi-

nometer meter and potentiometer (6.1.3). Turn the luminom-

eter meter switch to the TEST position. Wait at least 30 s for

the indicator to stabilize after switching. Operate the luminom-

eter at least 5 min at this position with the outer door closed in

a draft-free environment. Record the luminometer meter and

temperature indications (Note 8). Raise the wick and its holder

until a luminometer reading approximately ﬁve units higher is

indicated. Allow 5 min and again record the luminometer meter

and temperature indications as above. Repeat this procedure

until four data points are obtained; the last one being obtained

at the ﬂame height where a luminous tail (trace smoke) just

breaks out of the tip of the ﬂame. Soot would accumulate on

the thermocouple at a slightly higher setting.

9.3 Plot the data points on a luminometer meter reading

versus lamp temperature rise curve. All points should fall on a

smooth curve. The top point (smoke point of tetralin) will

represent rating level (meter reading) for all samples to be

tested in this instrument. Repeat four times to establish the

average rating level for the instrument (see Fig. 2).

NOTE 8—The rebalancing can be facilitated by putting a 40 to 60-mesh

screen in front of the opening.

9.4 Run two samples of ASTM reference fuel grade iso

octane as described in 9.1-9.3, but obtain four data points, two

below and two above the rating level established with tetralin

for the instrument. (The four data points should be uniformly

separated by approximately 10 luminosity units.) One of the

samples should be run before running the unknown test fuel;

the other sample should be run after running the test fuel. Plot

two curves, and at the rating level, ﬁnd the lamp temperature

rise for each sample of iso octane (Fig. 3). Average these

values.

9.5 Run one sample of the unknown test fuel in the manner

described for iso octane and determine the lamp temperature

rise for this fuel (Fig. 4). Use this value and the average DT’s

of tetralin and isooctane to calculate the luminometer number

of this test fuel.

NOTE 9—If a number of unknown test fuels are to be tested, the second

sample of isooctane may be run after all of the unknown test fuels,

provided all of these runs are made the same day.

OTE 10—Fuels that have high luminometer numbers are prone to form

condensation and are greatly affected by air leaks or leveling errors.

Preheating the interior of the cabinet with a small drop light, or using a

slow step-type warmup will prevent condensation problems. If condensa-

tion is encountered, meter readings will become unstable and moisture

will appear on the peep-hole glass. If condensation is encountered, it can

be removed by allowing the fuel to burn with the lamp door removed until

all moisture clears from the ﬁlter glass and holder.

OTE 11—Fuels that have very low luminometer numbers frequently

smoke at relative low meter readings. The absence of a smoking ﬂame

with fuels giving a low-temperature rise should be assured by observation

Fuel Tetralin

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

Lamp temperature rise at rating level 233°F

FIG. 2 Rating Level of Tetralin

Fuel

Iso

octane