Shimadzu AA-6800F - Burner Module

3.1 AA-6800/6650 Configurations
3-5
AA-6800/6650 Instruction
3.1.4 Burner Module
3.1.4.1 AA-6800
The burner drive is performed by PC operation. Therefore, there are no positioning knobs for driving the burner
module.
Figure 3.4 Burner Module (AA-6800)
No. (in
Figure 3.4) Name Function
1 B
urner head The types of flames which can be used with the standard
burner head are 3 types, which are air-acetylene flame and air
(argon)-hydrogen flames. Be sure to use the high temperature
burner head (optional) when using a nitrous oxide-acetylene
flame.
2 Burner head angle
adjustment lever
These allow the angle of burner slot to be adjusted relative to
the light path. Normally, the position at 0 on the scale (slot is
parallel with light path) is used, but when measuring high-
concentration samples, measurements of better linearity
between concentration and absorbance can be obtained by
angling the slot to decrease sensitivity.
3 Flame monitor An optical sensor is built in the instrument for monitoring the
intensity of the light emitted by the flame. If the flame goes out
and the light emission is lost, the solenoid valve in the gas
control unit is closed by a signal from the sensor and the flow of
raw gas is stopped. In addition, when switching between an air-
acetylene flame and nitrous oxide-acetylene flame, an increase
in the acetylene flow rate will be detected by an increase in the
light emission intensity, and the air and nitrous oxide will be
switched.
4 Pilot flame Pressing the IGNITE buttons on the gas controller ignites the
pilot flame.
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