This Information Applies To: Agilent ICP-MS systems (7700/7800/7850/7900/8800/8900)
This procedure tests for an air leak in the sample introduction system, or fault with spray chamber draining, by sealing the end of the torch with a piece of parafilm and testing plasma ignition. Sealing with parafilm isolates the torch from the rest of the sample introduction system. If the plasma ignites with the parafilm in place, the ICP-MS hardware is operational and the plasma ignition problem is due to a sample introduction fault.
If the spray chamber has flooded (not draining properly), water droplets can enter the torch and extinguish the plasma. A wet torch will not light and may be irreversibly damaged by plasma ignition. Therefore, it is important to install a dry torch, inspect the condition of the bonnet and platinum shield, and replace any damaged components before continuing with the test.
Steps to Follow
|Warning: The torch remains hot after the plasma is turned off. Do not touch the torch box for 10 minutes after turning off the plasma to let it cool.|
|Tip: Use a new torch to verify that the torch is dry at the start of testing. A wet torch will not light and may be irreversibly damaged by plasma ignition.|
Caution: Figure 3 does not show tightening the gas connectors by hand. The connectors should be snug, but not overtightened. If you apply too much pressure, the torch will break.
Caution: Do not re-attach the connection tube with the parafilm in place, as this will create a closed system between the spray chamber and connection tube. When the nebulizer gas is turned on during plasma ignition, pressure will build within this closed system, which can lead to the spray chamber end cap or nebulizer popping off to relieve the pressure.
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