Vessel Troubleshooting Guide
Contents
1. MDS 2000 Rev 42. Vessel Troubleshooting Guide Possible Cause Rupture membrane of Excessive amount of reactive Advanced Composite organic sample Vessel ruptures Microwave Transparent Valve in pressure sensing line of control vessel is closed Relief valve of Excessive amount of reactive Teflon PFA organic compounds in waste vessel vents water or TCLP extract Microwave Transparent Valve in pressure sensing line of control vessel is closed Two way valve on left side of instrument is in the incorrect neutral position MDS 2000 Rev 4 Allow vessels to cool and remove from system Discontinue digestion program Observe for a reaction when sample and acid are added to the vessel Conduct predigest without microwave heating for 15 20 minutes Allow reaction to sub side prior to sealing vessel and performing closed vessel micro wave digestion Polymers food and biological tissue samples may require sulfuric acid pre char step prior to closed vessel microwave digestion Allow vessels to cool and remove from system Do not continue digestion program Allow vessels to cool and remove from system Discontinue digestion program Conduct predi gest without microwave heating for 15 20 minutes Allow reac tion to subside prior to sealing vessel and performing closed ves sel microwave digestion Allow vessels to cool and remove the vessel s which vented Turn handle of microwave transparent valve to open position res
3. tart digestion program and monitor LCD for pressure rise Allow vessels to cool and remove from system Do not continue digestion program Replace ves sels which vented Turn screw handle of two way valve to open position 115 Vessel Troubleshooting Guide Continued 116 Pressure sensing tube Tubing is not fully inserted has come loose from and sealed into mating control vessel or fitting by the ferrule nut microwave trans parent valve Microwave Transparent Valve in pressure sensing line of control vessel is closed causing tubing to blow the seal at fitting Allow vessels to cool and remove control vessel and check sample volume to ensure starting amount is present If sample loss has occurred replace sample in control vessel to equivalent amount in other vessels Check to see that pressure sensing line is completely filled with water Flush and fill with additional water if loss has occurred Reconnect pressure sensing line by loosening ferrule nut and fully inserting tubing Hand tighten ferrule nut then tighten half a turn using a wrench Allow vessels to cool Remove control vessel and check sample volume to ensure starting amount is present If sample loss has occurred replace sample in control vessel to equivalent amount in other vessels Reconnect pressure sensing line by loosening ferrule nut and fully inserting tubing Hand tighten ferrule nut and then tighten half a turn using a wrench
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