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Functions and design of the contrAA 300
Basic unit
Use of the different flame types:
•
Acetylene/air flame can be used for most of the elements.
•
Acetylene/nitrous oxide flame is requited for elements that are hard to atomize,
such as boron, aluminum and silicon.
1
50-mm single-slot burner (standard)
100-mm single-slot burner
2
Fig. 5-3
Burner types
The burners are made of titanium and thus inert against aggressive sample solutions.
The burners can be easily exchanged and continuously rotated up to 90° between two
stops. One of the stops is adjusted in such a way that the burners are in alignment
with the optical axis. The 90° stop ensures the insensitive position of the burner at
right angles used for the determination of the principal components.
5.1.3.4 Sensors
The burner-nebulizer system is monitored by various sensors that ensure operational
safety.
•
A float switch in the siphon signals the correct fill level of 80 mm water column.
•
Two reflective couplers identify the burner type by means of a code.
•
A UV-sensitive sensor is used to monitor the flame.
In addition to the above mentioned sensors, the mixing chamber is equipped with a
pressure relief valve. This valve opens should the flame flash back into the mixing
chamber.
The control software evaluates the sensor signals and additionally monitors gas
pressures, gas flow rates and the status of the flame.
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Operating manual contrAA 300 10/2005
Analytik Jena AG