Replacing The Tri-Column Assembly - Agilent Technologies 6890 Series Service Manual

Gas chromatograph

Hide thumbs Also See for 6890 Series:

Table of Contents

Make a loop (or loops) in the excess column protruding from the valve

and move it to an unobstructive position.

Replacing the tri-column assembly

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 µm) is located under the COC inlet and

the end of the analytical column (250 µm) is under the detector.

Connect the retention gap to the COC inlet using a graphite ferrule and

a column nut.

If using 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 × 320 mm transfer line from the quartz Y-

splitter of the Tri-column assembly to the unused end of the stainless

union located inside the GC oven.

Check all of the connections for leaks using an electronic leak detector.

Coil it in a loose coil (approximately 6 inch diameter).

Secure the coil with heat resistant tape or equivalent.

Agilent 6890 Gas Chromatograph Service Manual

Solvent Vapor Exit Accessory

Replacement procedures

6890a 6890 plus