It is recommended that a serviced ECD always be accompanied by a conditioned column upon installation.

The Ni63 ECD Source (foil) has been approved for exposure to 350 deg. C for the HP and 400 deg. C for the Varian while in an N2 environment. It has been found that the ECD may become unstable at temperatures over 300 Deg. C. Operation above that temperature will reduce the 3 year life expectancy of the source.

To prevent contamination of the source, set the Ion-Oven temperature at 30 Deg. C + 15% above the Column oven temperature setting. The general rule is to operate the detector at 50 deg. C higher than the column-oven temperature. This minimizes condensation from the column of sample and column contaminants from contaminating the source.

To prevent Detector contamination always use high purity gas (oxygen and water vapor free).

Submerging the ECD Cell or running a liquid through it will cause the ECD exterior as well as the liquid to be contaminated with Ni63, and will require special handling.

Should you have any questions please contact us and we will help you rectify the problem. Technical supports is a free service we provide to help keep your down time to a minimum.

Loss of Linearity: The ECD contains a Ni63 source. As the source ages and weakens, several symptoms may occur. You will loose linearity and the ECD will become more sensitive.

Low Baseline: Contamination can cause a low baseline. This can occur from samples (often mixing samples that cause a reaction in the source chamber) and from less than high purity gas. A cleaning usually rectifies the problem.

High Baseline: A baseline climbing over time is usually the result of an aging or weakening source. A baseline that has jumped up suddenly usually indicates a leak in the system. Recheck connections and ferrules. Also check that the column is correctly inserted and not too far into the source chamber. Refer to your ECD manual to assure correct installation procedures.

Sensitivity: As the source ages and weakens it will become more sensitive over time. When an ECD is received back from service with a new source it will not be as sensitive but will have greater linearity. Contamination on the source can cause the detector standing current and sensitivity to decrease.

Thermal Cleaning: This procedure is recommended by the manufacturers and will sometimes take care of light contamination symptoms. However it also will drain the life of your source, follow instructions in the manual closely. If baking out the ECD does not remedy the problem, or you would prefer to have the ECD Cleaned, send it in and we will evaluate the condition of the ECD and service it accordingly.

Negative Dip: A negative dip after your peak can indicate contamination. Check your gas to confirm Ultra High Purity. A cleaning can usually bring the detector back into proper operating condition.