PID Lamp Information & Troubleshooting Sheet
Contents
1. Pl D Lamp Information amp Troubleshooting Sheet cat s 20675 20676 23020 Overview Because the PID lamp is a vacuum tube designed to emit ultraviolet energy there are specific handling procedures users should follow This information sheet addresses common questions and issues that occur with most PID lamps Operation temperature and current All PID lamps are carefully tested before shipment and are guar anteed to be in good operating condition when received However the practice of operating at elevated temperatures causes the warranty period to be limited to three months from the time of purchase Operation at various currents and temper atures will produce differing effects on life expectancy In gener al the lower the operating current and temperature the longer the lamp life Also turning the lamp off when not in use will extend its life Handling Avoid touching the window of the PID lamp Finger oils will seriously restrict UV transmission greatly affecting sensitivity If finger oils are evidenced on the PID lamp window rinse with a degreasing solvent such as acetone Installation Follow the installation instructions provided by the instrument manufacturer when changing PID lamps Never over tighten Over tightening will damage PID lamps resulting in failure or decreased lifetime Cleaning Normal operating conditions result in a UV absorbing deposit condensing on the outside of the lamp window P2. ature of 250 C for the PID lamp Higher tem peratures will drastically reduce the lifetime of the lamp When the lamp is not in use cool down the detector block and turn it off Temperature cycling does not have an effect on the metal glass seal It is designed to expand and contract at a rate that will not crack the glass Contact Technical Service at 1 800 356 1688 1 814 353 1300 ext 4 or support restek com or contact your Restek representative if you have any questions about this product or any other Restek product RESTEK Innovative Chromatography Products 2013 Restek Corporation All rights reserved Printed in the U S A 203 02 001 Rev date 03 13 Restek U S 110 Benner Circle Bellefonte PA 16823 phone 1 814 353 1300 1 800 356 1688 fax 1 814 353 1309 e www restek com Restek France phone 33 0 1 60 78 32 10 fax 33 0 1 60 78 70 90 www restek fr Restek GmbH phone 49 0 6172 2797 0 fax 49 0 6172 2797 77 e www restekgmbh de Restek Ireland phone 44 0 2890 814576 fax 44 0 2890 814576 e mail restekireland aol com Restek Japan phone 81 3 6459 0025 fax 81 3 6459 0025 e mail restekjapan restek com Thames Restek U K LTD phone 44 0 1494 563377 fax 44 0 1494 564990 www thamesrestek co uk Restek China phone 86 10 8588 6775 fax 86 10 8588 6743 cn restek com
3. built into the PID lamp to compensate for the different rates of expansion and contraction of the glass metal interface This will not affect the performance of the PID lamp Problem Broken lamp Overtightening the PID lamp into the mounting plates often causes this Follow prescribed installation method in your instrument owner s manual Problem Slowly losing sensitivity and a mirrorlike appearance is starting to form in the lamp This is part of the aging process of a PID lamp The mirrorlike appearance is a deposition of metals on the inside surface of the lamp These deposits will begin to absorb the UV energy thus lowering the output sensitivity achieved of the lamp When this happens replace the lamp Problem The color at the base of the lamp is not uniform This will have no effect on the performance of the lamp The metal used is a special alloy called Kovar Its stages of oxidation will show different shades of grey gold If the oxidation affects lighting use the PID polishing kit cat 20674 to polish the oxide off the surface Helpful Information The PID lamp must be operated at a constant temperature Changes in the temperature will have a direct effect on the output of the PID lamp Iron oxide powder supplied in the PID lamp polishing kit cat 20674 is ideal for cleaning The abrasives are small enough to only polish the window of the PID lamp and no scratching will occur Do not exceed an operating temper
4. eriodically the window must be cleaned to restore the lamp output This can be accomplished by using the PID lamp polishing kit cat 20674 Also polishing the contact ring at the base of the PID is recommended prior to use or after long periods of use This ring is metal and will build an oxide layer that will affect performance by inhibiting electrical contact Use the PID lamp polishing kit cat 20674 for this too Troubleshooting Tips Problem Declining output This is the most common problem and easiest to solve of all PID troubleshooting situations During use column bleed often condenses on the window of the PID lamp This buildup of siloxanes directly interferes with the amount of UV energy that reaches the sample Clean the PID lamp window as per instruc tions in the owner s manual or the PID Lamp Polishing Kit cat 20674 Problem Lamp will not light If the PID lamp itself is cracked the vacuum integrity inside the lamp will fail and the lamp will not operate Visually inspect the lamp for any damage or cracks and replace the lamp if necessary Corrosion can form on the electrical contacts at the base of the PID lamp Clean the base metal of the PID lamp using the PID lamp polishing kit cat 4 20674 If the lamp fails to light after installation clean the contact ring as instructed above Oxidation of this ring will cause the lamp to not light Problem The PID lamp rattles when shaken This is play that has been
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