Discovery TGA™ Getting Started Guide
Page 45
Leveling the Discovery TGA and Aligning the Balance
To avoid weight signal noise, the TGA instrument must be level so that the sample pan and hang-down
wire hang inside the furnace without touching the sides. The angle at which the pan hangs is very sensitive
to slight irregularities in benchtop surfaces, so it is required that the instrument is installed on a marble
bench.
Once you have your TGA in a satisfactory location, you will need to adjust the top and bottom of the
sample hang-down wire and level the instrument using the following procedures. These procedures are
performed with pans loaded on the hang-down wires.
Leveling the Instrument
Place a level across the rails of the instrument as shown below
Figure 29
Leveling the instrument.
Aligning the Sample Hang-Down Wire
1
Load a pan on the sample hang-down wire.
2
Adjust the position of the hang-down wire and pan until the bottom of the pan is 2.2 in. (5.6 cm) from
the cooling plate as follows:
a
Turn the center balance assembly hex head screw until it touches the floor of the chamber; this is
done to prevent the balance assembly from dropping in step b.
b
Adjust the balance up or down by turning the height adjustment screw. After the height is adjusted,
retighten the two locking screws.
Figure 30
Adjust the balance.
Up/Down
Adjustment screw
Up/Down
Locking screws
