Restek Capillary Column Installation Guide

1. Pinpointing Performance Problems
   
2. Contacting Restek for Technical Service
   
3. Return Authorization Procedure
   

Many problems associated with capillary chromatography are due to sample contamination or instrument variables. Our technical service chemists may suggest some troubleshooting procedures to isolate these variables. Preliminary troubleshooting efforts by you help us identify the cause of the problem faster and can save you valuable down time.

A. Please follow these steps to pinpoint performance problems:

Isolate the Column From Instrument Variables:
The first step is to isolate the column from instrument variables. To do this, simply install a new column into the same GC without changing any GC related variables. We highly recommend keeping a spare column on hand at all times, but if you do not have a spare column, then install the questionable column in another GC that is working properly. If the problem does not seem to follow the column, (i.e. the new column does not work in the same GC, or the old column works fine in another GC), then we suggest performing routine maintenance on the injection port and detector as described in Section II of this installation guide. If the problem seems to follow the column, then it is time to perform routine maintenance on the column as described in Section III of this installation guide.

Begin Diagramming and Documenting
Document the procedures in chronological order listing times, dates, and important instrument parameters. Label all troubleshooting chromatograms. These steps help to inform anyone else that may be working on the system of the troubleshooting procedures that have been completed.

Start with a simple instrument diagram and try switching column A to detector B and vice versa. If the problem moves to detector B, then the problem is most likely occurring in the injector.

If the problem stays on Detector A when the column outlet is switched, then suspect a detector problem. Begin isolating detector problems by switching hardware, cables, electrometers, integrators, or any suspect part in the pathway. If the problem goes away from the A side, then that detector is most likely the cause and should be replaced.

B. If you are unable to pinpoint the problem:

Contact our technical service group at 800-356-1688 (ext. 4). Save all chromatograms and notes on any operating parameters.

1. The column's catalog and serial numbers.
2. Where and when the column was purchased and the invoice or purchase order number.
3. Instrument parameters:
   1. instrument manufacturer and model number
   2. injection mode
   3. attenuation and range setting
   4. oven temperature profile
   5. injector and detector temperatures
   6. detector type
4. Sample parameters:
   1. sample size, list of sample components, and concentrations
   2. description of the sample components that work and those that are problematic
   3. derivatization agents, inorganics, or high molecular weight residue which may be present
   4. number of injections made with the sample on this particular column and the length of time the column has been in service
5. Concise description of the problem:
   1. observed symptoms
   2. variables affecting the symptoms
   3. steps taken to solve the problem
   4. if the problem has been observed before

Before you call, obtain chromatograms generated when the column was working properly and chromatograms that illustrate the problem you are having.

C. Return Authorization Procedure:

Procedure for Returning Capillary GC Columns
If a phone call does not resolve the problem satisfactorily, we will evaluate the column in our lab to identify the problem source. Before returning the column, obtain an RA# (return authorization number) from a technical service chemist.

Important Note: If you purchased the column through a distributor, you must obtain return authorization through that distributor.

To send the column back, place it in its original box and tape. Send it prepaid to this address:

      Restek Corporation
      110 Benner Circle
      Bellefonte, PA 16823-8812
      Attn: RA# _____________

[ Note: information provided here is specific to Capillary GC Columns. Refer to the current Chromatography Products Guide for return authorization information on other types of products, or call Technical Service at 800-356-1688 (ext. 4). ]

After receiving the column, it is retested in our QA lab and rinsed if necessary. In most cases, the column evaluation is completed within three working days. A technical service chemist will call and discuss the results and give suggestions. If we determine the column is working satisfactorily or was contaminated and simply required solvent rinsing, it will be returned to your lab with our recommendations to help you avoid this problem in the future. If the column is defective, it will be replaced immediately with a new column. There is no charge for retesting or troubleshooting column problems.

When column problems are suspected and you need the product immediately, we can send you a new column, but we must invoice you for it. Credit is issued to your account if the returned column can be restocked or is found defective. If the problem was system-related or was caused by improper handling, the column will be returned to you and the replacement item invoice is due. We cannot restock damaged or used items.

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