Hollow cathode lamp maintenance
(1) After turning on the lamp power switch, slowly adjust the current to the specified value, and suddenly raise the lamp current to the specified value, which will cause the cathode surface to spray, which will affect the service life of the lamp. In severe cases, the cathode will be damaged. damage.
(2) If the hollow cathode lamp is not used for a long time, it will not be used normally due to air leakage, gas adsorption, etc., or even ignited. Therefore, every 3-4 months, the lamps that are not commonly used should be energized for 2-3 hours to maintain the performance of the lamp and extend its service life.
(3) The hollow cathode lamp will age after being used for a period of time, resulting in unstable illumination, weakened intensity, increased noise and reduced sensitivity. In this case, the activator can be activated. Alternatively, the cathode and anode of the hollow cathode lamp are reversely connected and then energized for a half hour at a specified maximum operating current. Most of the hollow cathode lamps are restored to a certain extent after activation treatment, prolonging the service life of the lamps.
(4) When using a hollow cathode lamp with low melting point elements (such as As, Se, etc.), avoid large vibrations. If it is used, it is not possible to replace other lamps immediately.
(5) When picking up or loading or unloading the hollow cathode lamp, take the lamp holder, do not take the lamp tube, and do not touch the quartz window of the lamp to prevent the lamp tube from rupturing or the window being stained, and the photo-induced light energy is reduced. If you find oily, fingerprints or other dirt on the window, use a cotton wool dampened with alcohol to gently wipe.
(6) Once the hollow cathode lamp is broken, the cathode material is exposed to the outside. In order to prevent certain harmful elements on the cathode material from affecting human health, the harmful materials should be disposed of according to regulations, and should not be randomly discarded.
Before the lamp is used, the best lamp current selection experiment should be made according to the requirements of the stability and sensitivity of the lamp within the given lamp current range. Working current--When enough energy can be supplied to the host, try to use a small working current. At this time, the self-absorption of the emission is small, which makes the measurement sensitivity higher and the linear range expands, and also prolongs the life of the lamp. Depending on the passband width (or slot width) of the monochromator, these three factors should be properly matched to provide superior sensitivity and stability. The current used by the lamp can be referred to the current given by the instrument manufacturer. In use, the sputtered metal is gradually deposited inside the lamp housing, and the new lamp that has been aged has been deposited. Normally, during the storage period, regular empty spots are not allowed, and the lamp is reversely processed - usually made of metal with purification effect. The anode only works when it is used as a cathode. If the orange-red tint of the cathode is lightened (the strength is reduced), it can be reversed. It can be carried out by using the lamp power supply of the main unit with a reverse socket. -20mA, time is about 2-4 hours, note: alkali metals other than alkali metals and magnesium can not be reversed.
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