Lamps, troubleshooting

The frequency of operational qualification of a CE instrument depends on factors such as the manufacturer s recommended OQ interval, the required instrument performance, and the instrument s use. Note that preventive maintenance procedures such as lamp replacement may require repeating the qualification of the particular CE function [3]. The following sections describe the tests to perform and their associated limits that are intended to qualify a CE instrument for its general purpose. Troubleshooting tips for instruments that do not perform to the intended specifications are presented in Section 12.4. 

Many detectors track the number of hours the lamp is ignited. Although the lamp life may vary, the detector s meter reading can be a helpful guide for troubleshooting. Lamps can sometimes operate for more than 2000 h. To distinguish a lamp problem from air bubbles, one should stop the mobile phase flow. A lamp problem will persist when the flow is stopped, whereas, if the problem is due... 

Do the troubleshooting if the alarm lamp re-illuminates after its extinguishments following the 6-second-flashing (or it keeps... 

General troubleshooting guidelines are provided for ultraviolet (UV) units. A low radiation intensity indicator is provided with all UV units. The lamp intensity should be greater than 80%. 

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