How can the XT instrument be checked to verify that it is operating correctly?

Below is a list of steps to verify that the XT instrument is operating correctly. Always refer to your manual for complete, detailed information.

Refer to XT15 Service Procedure Solvent, Vent, and Water Diagram (X5S006) for a four-page diagram that may help explain the operation.

1. Before starting, verify the water pressure is ON and that there is no water flowing through the drain line.
2. Add solvent to the XT15 fill cup until the solvent level reaches or exceeds the fill line in the site glass.  
3. Close and lock the vessel (the vessel should be securely closed).
4. Select operating parameters and press START.
5. The XT15 will begin a FILL cycle. The fill valve (Q4) and vent valve (Q7) will open. After 60-90 seconds, the solvent should fill the vessel and cover the glass level sensor in the XT15 vessel. The XT15 will start to heat.
6. While the instrument is heating, observe the drain tube. There should be no water exiting the XT15 during heating.
7. At minutes two and four, the Q5 valve will open briefly to exhaust any trapped air. The temperature on the LCD should rise rapidly. When it reaches 90°C, the reflux cycle begins. Do not open the vessel. Pressure should be approximately 20-50 psi, depending on the solvent.
8. At five to eight minutes, the heat will reach 90°C and the reflux cycle begins. The reflux cycle turns the reflux water on for 60 seconds and off for 30 seconds throughout the run. You can observe the water flow rate by viewing the flow meter to the left of the vessel.
9. After the extraction has been completed, the condenser water valve will open and cool the condenser. The Q6 drain valve opens and the hot solvent will be pushed out of the vessel and into the condenser. After draining, the vessel base will be cooled with water. The vessel walls will remain warm.