Specifications

condenser with an equal volume mixture of toluene
(Warning—Flammable. Vapor harmful. See A1.4.) and anhy-
drous methanol (Note 2). (Warning—Flammable. Vapor
harmful. May be fatal or cause blindness if swallowed or
inhaled. Cannot be made nonpoisonous. See A1.5.) Allow the
wicks to dry partially for 5 min, then place them in an oven and
dry for
1
⁄ 2 h at 100 to 110°C. Store in a dessicator until used.
Thoroughly wash the sample holder in acetone and dry (Note
3). Then insert a dry wick in the wick tube of the clean sample
holder. A piece of thin wire hooked through the end of the wick
will allow the wick to be pulled through the tube without
twisting. Use a clean razor blade or other sharp instrument to
cut off the wick flush with the top of the wick tube (Note 4).
Raise the wick by twisting the lower part until the end of the
wick protrudes. Then, pull the wick up and remove any twists
in the wick by rotating the ends of the wick. Also pull the wick
down until the top of the wick is
1
⁄ 4 in. (6.4 mm) above the
tube. Trim any frayed ends from the top of the wick. If the wick
has not been cut square, recut and position as outlined above.
(Note 5.)
NOTE 2—If extraction facilities are not available, request supplier to
supply wicks that have been extracted.
N
OTE 3—If either fuel or acetone vapors are not removed from the
sample holder during the cleaning and drying operations, erroneous
ratings can be obtained.
N
OTE 4—Some razor blades have a protective chemical coating which
should be removed with a solvent.
N
OTE 5—An alternative method of preparing a wick free of twists and
frayed ends utilizes a Wick Trimmer Assembly.
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The wick trimmer holder
is inserted over the top of the wick tube and the long-nosed triceps are
inserted through the tube and holder. The wick is grasped and carefully
pulled through the tube without twisting. A new clean sharp razor is used
to cut the wick at the face of the holder and remove wisps and frayed ends.
When the holder is removed, the wick will be at the correct height in the
tube. The tube is then inserted into the candle and screwed home. The
candle is inserted into the lamp.
8.3 The flame axis of the ASTM-CRC Luminometer lamp
must be vertical for proper operation. Adjustable cabinet
vibration mounts are provided for this purpose. Adjustment can
be checked by a small level positioned on the large flame
height adjusting ring. The level of the lamp should be checked
in both the front to rear plane and the side to side plane. If at
any time the position of the cabinet or the lamp is disturbed, the
lamp level must be checked. If the position of the stack
thermocouple is disturbed or the thermocouple replaced, the
thermocouple should be positioned with the junction exactly on
the lamp centerline. The bottom of the thermocouple shield
should be exactly 1 in. (25.4 mm) above the wick guide.
Suitable gages for this purpose are available from the manu-
facturer.
8.4 Temperature Measurement:
8.4.1 Potentiometer (Serial No. 377 and earlier)—Be sure
the ambient air thermocouple is in its operating position (pulled
to the right toward the lamp) and the stack thermocouple is
connected. Turn the right switch of the potentiometer to TEST
position; also turn the lower left switch to ZERO position and
hold while adjusting the upper center knob until the galvanom-
eter pointer rests at “0” (mechanical zero). Turn the lower left
switch to STD and hold while adjusting the battery knob (upper
left) until the galvanometer rests at“ 0” (electrical zero). If the
meter will not standardize, replace the internal potentiometer
battery.
7
8.4.2 Temperature Indicator (Serial No. 378 and
higher)—Be sure the ambient air thermocouple is in its
operating position (pulled to the right toward the lamp) and the
stack thermocouple is connected. The output switch must be in
the “OFF” position. Place the power switch in the “F”ahrenheit
position. No additional adjustment is required. Return power
switch to the “OFF” position between tests to conserve
batteries. (Note 6.)
8.4.2.1 Four type 1.2 AHR SC Size rechargeable batteries
are used to supply power for the unit. To recharge the battery
pack, insert the battery charger plug into the “RECHARGE”
jack located on the front panel. Use the 115 volt charger only
on a 115 volt line (Note 6).
NOTE 6—For maximum battery life, it is recommended that the unit
7
be
charged only when the discharged battery indication (display indicates
HELP) is observed. Do not charge for periods longer than 18 h. Charge
unit before initial use.
Display Symbols
HI— temperature over range
Help— batteries discharged
F— fahrenheit
8.4.3 Digital Temperature Indicator (Serial No. 410 and
Higher)—Be sure the ambient air thermocouple is in its
operating position (fully extended to the lamp) and the stack
thermocouple is connected. Turn unit on by pressing the
On/Off position on front key pad. Input temperature will be
displayed.
8.4.3.1 Battery is a standard 9 V to supply power for the
unit.
8.5 Luminometer Meter
8
—Turn the switch located below
the right hand side of the luminometer meter to the OFF
position. Adjust the meter to “0” by rotating the meter arm
pivot screw on the lower front center of the meter. Then turn
the switch to ZERO and turn the zeroing adjustment control
located below the left-hand side of the meter until the meter
arm rests at “0”. To facilitate zeroing use the coarse and a fine
zero adjustment. Next turn the switch to A
1
,A
2
,B
1
, and B
2
to
check the battery voltage. If on each switch position the meter
rests above the appropriate mark on the meter scale, the
batteries are satisfactory and the unit is ready for use. If the
batteries are under strength, replace them. When replacing the
“B” batteries also replace the photocell batteries located inside
the photocell box.
9. Procedure
9.1 Introduce 20 mL of tetralin at room temperature into the
clean dry sample holder. Place the wick tube into the top of the
sample holder and screw tight. Run a small wooden applicator
stick into the air vent hole in the bottom of the holder to free
the vent of fuel. When the fuel rises to the top of the wick,
6
Wick Trimmer Assembly, ERDCO Part No. 2LA-5520.
7
Battery Pack, ERDCO Part No. 2LA-14229.
8
ERDCO Part No. HCS-7962.
D1740–01
3