PerkinElmer TGA 8000, Installation And Hardware Manual

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Set Up TGA 8000 System Components . 29
Set Up TGA 8000 System Components
Setting up the TGA 8000 system components consists of the following steps:
•
Install the Purge Gases
•
Level the TGA 8000
Install the Purge Gases
The TGA 8000 has gas inlets at the rear of the analyzer, (Sample Gas A and B, System
(Balance) Gas, and Reactive Gas. Having two separate purges allows the flow rate of the
purge gas in the balance area to be greater than that in the furnace tube area. This creates
positive pressure that helps prevent reactive gases from entering the balance area. Using
both a balance purge and a sample gas allows you to use reactive gases for various analyses.
This System gas supply is used for the antistatic device. Finally, there is an inlet on the rear
panel to connect Reactive gas that enters the sample area directly.
Overview of the Purge Flow through the TGA 8000
The balance purge gas enters the back of the analyzer and then the cavity under the balance
cover. It then flows down the Pyrex ball joint into the furnace tube between the tube and the
liner. It exits the side arm of the furnace tube into the exhaust tubing.
CAUTION: The system purge flow rate should always be greater than the sample
gas flow rate to prevent decomposition products from entering the balance
chamber. The recommended flow rate is 20 – 100 ml/min for the balance purge
and 10 – 50 ml/min for the sample gas.
ATTENTION : Le débit de purge du système doit toujours être supérieur au débit
de gaz échantillon afin d'éviter que les produits de décomposition ne pénètrent
dans la chambre d'équilibrage. Le débit recommandé est de 20 - 100 ml / min
pour la purge de l'équilibre et de 10 - 50 ml / min pour le gaz échantillon.
CAUTION: The total flow rate of the balance purge gas, sample gas, and reactive
gas should be below 200 ml/min.
ATTENTION: Le débit total du gaz de purge d'équilibrage, du gaz échantillon et
du gaz réactif doit être inférieur à 200 ml / min.
The Sample Gas enters through connectors (labeled Sample Gas A or Sample Gas B) on the
back of the TGA 8000. It is applied as pressure 1 - 3 Bar (optimum 2 Bar). The software
controls the gas flow controller to the sample area. Gas is directed to the furnace through
Teflon tubing from the flow controller to an inlet port on the bottom of the Balance mounting
plate. From here it flows through a chamber out of the plate and above the anti-connection
tube into the furnace area..
You can use the same gas source (house line or cylinder) for both balance system purge gas
and sample gas by using a serial pressure gauge setup (P/N N5190462).
Connecting the System Purge and Sample Gas Lines to the Gas Supply
To connect the system purge and sample gases, using separate sources, you will need parts
included in the Spares kit (P/N N5320120).