๐ ๏ธ TG (STA) Exhaust Port Inspection โ Essential for Smooth Operation!
During thermogravimetric (TGA) and simultaneous thermal analysis (STA), sample decomposition produces gases that exit the furnace via the exhaust port. Over time, condensates can accumulate at thermal interfaces (e.g., furnace ports and passages), obstructing the gas flow. This can lead to unstable TG signals, testing failures, or even contamination of the furnace and balance chambers, potentially damaging the instrument.
Why Exhaust Port Inspection is Crucial:
The exhaust port is typically located at the top of the furnace body, connected to a white Teflon tube that vents gases. Regular inspections are essential to maintain instrument efficiency.
Exhaust Port Inspection Procedure:
- Prepare a cup of clean water.
- Close the furnace and activate the protective gas PG (Nโ) at 20 ml/min, and purge gas P2 (Nโ) at 50โ100 ml/min.
- Submerge the white exhaust tube 2โ5 mm below the water surface. Wait 30 seconds.
- If continuous bubbles emerge, the gas pathway is clear. If no bubbles appear, cleaning is required.
Friendly Reminder:
Due to variations in decomposition rates and byproducts, establish a cleaning schedule based on your specific testing conditions. Regularly cleaning the exhaust port and tubing ensures unobstructed gas flow and stable instrument performance.
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