Initial Setup for the Balance and Hangdown Wires . 41
Adjusting the Convection Iris
The iris is an anti-convection device. It prevents reaction gases from rising into the balance
chamber from the furnace.
CAUTION:
If the iris is not adjusted properly then soot from the sample will
contaminate the balance mechanism. It is important that the hangdown wire does
not touch the iris when it is closed.
ATTENTION:
Si l'iris n'est pas réglé correctement, la suie de l'échantillon
contaminera le mécanisme de l'équilibre. Il est important que le fil pendulaire ne
touche pas l'iris lorsqu'il est fermé.
1.
Close the iris until it is approx 1mm clearence between the edge of the iris and the
hangdown wire all around. The wire should be centered in the iris.
2.
If it is not centered then the balance mechanism must be adjusted.
Adjusting the Balance Mechanism
If the hangdown wire is not centered in the iris then you will have to adjust the balance
mechanism position.
CAUTION:
The balance mechanism is very fragile. Use extreme caution when
handling.
ATTENTION:
Le mécanisme de l'équilibre est très fragile. Soyez extrêmement
prudent lors de la manipulation.
1.
Ensure that the upper cooling fan is off; otherwise, it will cause the hangdown wire
to swing.
2.
The adjustment screws are easily accessible (one shown below – red arrow). Loosen
the screws and carefully move the balance to position the hangdown wire in the
center of the iris.
NOTE: A small amount of rotation of the hangdown wire (see Autosampler Calibration) is possible by
rotating the balance about the hangdown wire centerline.
3.
Tighten the balance screws.
Summary of Contents for TGA 8000
Page 1: ...TGA 8000 Installation and Hardware Guide THERMAL ANALYSIS...
Page 5: ...5 Safety and Regulatory Information...
Page 19: ...19 Prepare the Laboratory...
Page 25: ...25 Installing the TGA 8000...
Page 55: ...55 TGA 8000 Hardware Maintenance...
Page 68: ...68 TGA 8000 Installation and Hardware Guide...
Page 85: ...85 TGA 8000 Autosampler...
