Chapter 4 Basic Operation
4-64
AA-6800/6650 Instruction
4.8.4 Igniting and Extinguishing N
2
O-C
2
H
2
Flame
(1) Take off the standard burner head (slot length 10 cm) and mount the high temperature burner head (slot
length 5 cm) supplied as an optional accessory.
(2) On the [Atomizer/Gas Flow Rate Setup] page, click on the [Fuel Gas Flow Rate] radio button. Select [N
2
O-
C
2
H
2
] for [Flame Type] and enter the flow rate (7.0 to 8.0 L/min) in the [Fuel Gas Flow Rate] field. Also, the
flow rate can be changed by the [Increase] and [Decrease] buttons.
(3) Insert the burner recognizing key connected to the high temperature burner head with a wire into the hole
of the BURNER SELECT switch.
(4) Press two IGNITE buttons at the same time to ignite the flame. First, the Air-C
2
H
2
flame will be ignited.
Keep pressing the IGNITE buttons until the flame is completely ignited.
If the flame is not ignited even if the buttons are pressed for three seconds or more, stop igniting operation
once, and retry after ten seconds or more.
When the ignition has failed, the AA software may display an error message like "Flame has been
extinguished". When such a message is displayed, the AA main unit is locked so that the igniting operation
cannot be done. To release this lock, close all the error messages displayed on the software.
Approx. 10 seconds after the flame ignition is achieved, the C
2
H
2
flow rate is automatically increased to
5.0 L/min and the flame emission intensity is increased. Then the support gas is automatically switched
from Air to N
2
O, changing the Air-C
2
H
2
flame to N
2
O-C
2
H
2
flame.
(5) To extinguish the flame, press the EXTINGUISH button. The support gas is automatically switched from
N
2
O to Air, changing the N
2
O-C
2
H
2
flame to Air-C
2
H
2
flame. Then the flame is extinguished.
NOTE
7. If the flame should not be extinguished even by pressing the EXTINGUISH button, do not panic and
take action of following operation.
a. Turn off the main unit POWER switch (on the left side of the main unit). This operation
mechanically closes the solenoid valve of the gas controller, shutting off the gas supply safely.
b. Close the gas main valve.
c. Contact your service representative immediately. Do not operate the instrument until the repair by
service person completes.
NOTE
Even if the [Flame Type] is set to N
2
O-C
2
H
2
, the flame will not be switched unless the BURNER SELECT
switch is set to N
2
O-C
2
H
2
with a key attached to the high temperature burner head. In this case, if the
BURNER SELECT switch is changed from the Air-C
2
H
2
to the N
2
O-C
2
H
2
position while Air-C
2
H
2
is flaming,
the support gas is automatically switched from Air to N
2
O, changing the Air-C
2
H
2
flame to N
2
O-C
2
H
2
flame.
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