260 Solvent Vapor Exit Accessory
Contents
1. 0124 e Vespel graphite ferrules e For 250 um column part no 5062 3508 e For 320 um column part no 5062 3506 e 1 8 inch Swagelok nut part no 5180 4103 e 1 8 inch solid no hole vespel ferrule part no 0100 1372 or 1 8 inch Swagelok cap e Electronic leak detector optional Jun 2001 Inlets 7 of 10 Agilent 6890 Gas Chromatograph Service Manual 260 Solvent Vapor Exit Accessory Leak testing Replace the septum of the Cool On column inlet Using a 1 16 inch SS union and the appropriate graphite Vespel ferrules connect the detector end 250 um of the tri column assembly and the transfer line 320 um together From the 6890 GC keyboard set the inlet pressure to 50 psi and wait approximately 15 seconds for equilibration Note If pressure can not be reached either avery large leak is present or the supply pressure is not high enough at least 10 psi greater than desired pressure 4 Cap the septum purge vent of the Cool On column flow module using a solid no hole 1 8 inch Vespel ferrule part no 0100 1372 and a 1 8 inch Swagelok nut part no 5180 4103 As an alternative a 1 8 inch Swagelok cap can be used 5 From the GC keyboard turn the inlet pressure OFF 6 Note the Actual reading on the display and monitor for 10 minutes You can use the stopwatch feature of the 6890 GC to monitor the time by pressing Time and then Enter to start timing 7 Ifthere is less than2. as an ESD wriststrap 1 Turn off the GC and unplug the power cord Allow time for all heated zones to cool and then turn off supply gases at their sources 2 Remove the top cover the pneumatics cover the electronics carrier cover and the right side cover 3 Remove the bleed restrictor column and the solvent vent waste line from the valve fitting assembly 2 of 10 Inlets Jun 2001 Agilent 6890 Gas Chromatograph Service Manual Solvent Vapor Exit Accessory 260 Replacement procedures Heat resistant tape Bleed restrictor column Connect solvent Stainless tubing waste line Figure 260 2 Removing the valve fitting assembly shown with valve driver bracket installed 4 Inside the oven disconnect the 320 um transfer line from the stainless union on the 1 16 inch stainless steel tubing Carefully remove the tubing from the oven through the cutout in the top of the oven 5 Disconnect the valve driver cable from the valve jumper cable or valve driver assembly as applicable 6 Remove the mounting screw in the valve fitting assembly and remove the assembly from the GC Jun 2001 Inlets 3 of 10 Agilent 6890 Gas Chromatograph Service Manual 260 Solvent Vapor Exit Accessory Replacement procedures 7 Replace the valve fitting assembly and mount it to the GC oven with the screw Cover the open end of the union to avoid contamination and route the 1 16 inch stainless steel tubing and union
3. into the oven Repack the insulation around the tabling Connect the valve driver cable to the valve jumper cable or valve driver assembly as applicable 8 Use anew graphite Vespel ferrule to reconnect the 320 um transfer line to the union 9 Examine the bleed restrictor column If the column is damaged replace it with a new 0 5 m length of 50 m column installing a new fitting and ferrule Be sure to trim 5 to 10 mm off the end of the new column after installing the new fitting and ferrule 10 Reattach the solvent waste vent line WARNING Because a significant amount of solvent is vented through the SVE valve assembly it is important that the bleed restrictor and the solvent vent are connected to an appropriate laboratory ventilation system 11 Check for leaks Replacing the bleed restrictor column 1 Turn off the GC and unplug the power cord Allow time for all heated zones to cool and then turn off supply gases at their sources 2 Remove the top cover and the right side cover If necessary also remove the pneumatics cover and the electronics carrier cover 3 Using a wrench remove the old bleed restrictor column 4 Cuta0 5 m section off of the new 50 um bleed column for use as the restrictor 5 Attach a male fitting and ferrule to the restrictor column then trim 5 to 10 mm from that end of the column 6 Connect the 0 5 m 50 um bleed restrictor to the SVE valve 4 of 10 Inlets Jun 2001 Agilent 6890 Gas Chromatog
4. 1 5 psi pressure loss consider the system to be leak tight 8 If pressure loss is much greater than 1 5 psi there is a leak that must be found and corrected 8 of 10 Inlets Jun 2001 Agilent 6890 Gas Chromatograph Service Manual Solvent Vapor Exit Accessory 260 Leak testing Leak testing the SVE assembly 1 Cool the oven and inlet 2 With only the carrier gas flowing through the GC and column close the SVE solenoid valve 3 Usean electronic leak detector to check for leaks Detection fluid may be used on the valve assembly but be sure to avoid contaminating the oven or electrical connections Clean up any fluid after use 4 Ifaleak is found at a connection tighten the fitting or replace the seals If there is a leak through the valve replace the valve fitting assembly Jun 2001 inlets 9 of 10 Agilent 6890 Gas Chromatograph Service Manual 260 Solvent Vapor Exit Accessory Leak testing 10 of 10 Inlets Jun 2001 Agilent 6890 Gas Chromatograph Service Manual
5. 260 Solvent Vapor Exit Accessory Theory of operation The Solvent Vapor Exit SVE is a GC accessory for performing large volume injections with a Cool On Column inlet COC At the start of the run the SVE solenoid valve is open as the large volume sample is injected into the cool on column inlet and moves into the retention gap The precolumn separates most of the solvent from the analytes and vents it through the open valve At a time specified by the user to optimize the analysis the valve closes the oven temperature program begins and the retained solvent and analytes move onto the analytical column for separation Solvent Vent Valve es Solvent Waste Port ene lt gt 50 mm Bleed Restrictor SS Transfer Line Cool On column Inlet SS Union Detector 320 mm Transfer line Retention Retaining HP 5MS Gap Pre Column Analytical Column 5M 530 mm 2M 250 mm 30M 250 mm Figure 260 1 Solvent vapor exit accessory flow diagram Jun 2001 inlets 1 of 10 Agilent 6890 Gas Chromatograph Service Manual 260 Solvent Vapor Exit Accessory Replacement procedures Replacement procedures Replacing the valve fitting assembly WARNING Hazardous voltages are present in the mainframe when the GC power cord is plugged in Avoid a potentially dangerous shock hazard by unplugging the power cord before removing the side panels Caution Prevent electrostatic voltages from damaging the GC by using precautions such
6. asily trim the end and insert again A concentric circle inside the splitter should result if the column is installed correctly After connecting the column ends into the quartz splitter reconnect the tri column assembly inside the GC oven and increase the column head pressure incrementally to the desired pressure An incremental increase is better than immediately applying the total column head pressure to avoid a shock that can loosen the connection 6 of 10 Inlets Jun 2001 Agilent 6890 Gas Chromatograph Service Manual Solvent Vapor Exit Accessory 260 Leak testing Leak testing When checking the solvent vapor exit assembly for leaks first check the tri column assembly If the tri column assembly is not leaking check the valve fitting assembly which includes the stainless steel union tubing and fitting on the solenoid Potential leak points e Tri column assembly e Quartz column connector e Quartz Y splitter e Connection to the inlet e Valve fitting assembly e Solenoid valve e S S union e Inlet fitting on the valve fitting assembly Note that there are no replacement parts on the valve fitting assembly If the valve fails or the fitting cannot be tightened replace the assembly Leak testing the tri column assembly Tools Required The following tools not supplied in the SVE Kit are required to perform the leak check procedure of the tri column assembly e 1 16 inch SS union part no 0100
7. nd of the stainless union located inside the GC oven Check all of the connections for leaks using an electronic leak detector Jun 2001 Inlets 5 of 10 Agilent 6890 Gas Chromatograph Service Manual 260 Solvent Vapor Exit Accessory Replacement procedures Note Replacing the pre column assembly 1 2 Cool the inlet and detector Turn inlet and detector gases off Disconnect the Tri column assembly from the COC inlet the detector and the SS union and remove the column assembly from the GC oven Using a column cutter cut the transfer column and the analytical columns as close to the quartz Y splitter as possible Be sure to cut the columns straight Using the column cutter trim the ends of the tri column assembly ensuring that the cuts are straight Then use a lint free wipe and methanol to clean any dirt and finger prints from approximately three to four centimeters from each of the five column ends Being careful not to touch the ends of the columns insert them into the quartz splitter as far as possible making sure that the column ends are making contact with the inside walls of the splitter Sufficient pressure should be applied to give a good seal Too much pressure on the other hand can damage the polyimide layer or even the column and result in leakage Test to see that the column has been installed correctly by trying to pull the column out of the splitter using medium force If the column comes out e
8. raph Service Manual Solvent Vapor Exit Accessory 260 Replacement procedures T Make a loop or loops in the excess column protruding from the valve and move it to an unobstructive position e Coil it in a loose coil approximately 6 inch diameter e Secure the coil with heat resistant tape or equivalent Replacing the tri column assembly 1 2 3 Cool the inlet and detector Turn inlet and detector gases off Disconnect the Tri column assembly from the COC inlet detector and SS union and remove the column assembly from the GC oven Install the new SVE Tri column assembly onto a column hanger and hang the assembly inside the GC oven Position the column assembly so that the end of the retention gap 530 um is located under the COC inlet and the end of the analytical column 250 um is under the detector Connect the retention gap to the COC inlet using a graphite ferrule and a column nut Ifusing a MSD connect the analytical column HP 5MS to the MSD using a column nut part no 05988 20066 and a graphite Vespel ferrule part no 5062 3508 If using any other type of detector connect the analytical column HP 5MS to the GC detector using a column nut part no 5181 8830 and a graphite Vespel ferrule part no 5062 9527 Remove the stainless ferrules from the union Use a graphite Vespel ferrule to connect the 0 5 m x 320 mm transfer line from the quartz Y splitter of the Tri column assembly to the unused e
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