Shimadzu liquid phase deuterium lampIt is the core light source of liquid chromatography ultraviolet detector, and its performance directly affects the accuracy and stability of detection data. By doing the following daily maintenance points, the service life of deuterium lamp can be effectively extended and detection efficiency can be guaranteed.
Standardize the on/off operation and wait for 15-30 minutes for preheating after starting up. Wait for the energy of the light source to stabilize before testing to avoid baseline drift caused by unstable light source. When shutting down, the deuterium lamp power should be turned off first, and after it has completely cooled down (about 30 minutes), the main power of the instrument should be cut off to prevent damage to the filament caused by power failure under high temperature conditions. Frequent switching of deuterium lamps is strictly prohibited. If the instrument is not used for a short period of time (within 1 hour), it is recommended to keep the deuterium lamp in standby mode.
Clean and moisture-proof the light source regularly. Dip a dust-free soft cloth in a small amount of anhydrous ethanol and gently wipe the dust and stains on the deuterium lamp housing and transparent window to avoid dust blocking and affecting the light intensity output. During the idle period of the instrument, it is necessary to keep the inside of the detector dry. Silica gel desiccant can be placed to prevent the deuterium lamp electrode from being affected by moisture and oxidation. At the same time, avoid direct contact of deuterium lamps with corrosive gases or reagents.
Regularly monitor energy and replace spare parts. Before each use, check the energy value of the deuterium lamp through a chromatographic workstation. If the energy is lower than 70% of the initial value, aging treatment or replacement of the lamp should be carried out in a timely manner. Record the cumulative usage time of the deuterium lamp. The conventional service life of Shimadzu liquid-phase deuterium lamp is about 1000-2000 hours. When the service life limit is reached, it is recommended to replace it actively to avoid sudden failure of the light source during the detection process.
Avoid external damage and voltage fluctuations when loading and unloading deuterium lamps. Handle with care and do not touch the filament and quartz window to prevent physical damage. The instrument needs to be connected to a regulated power supply to avoid voltage fluctuations impacting the deuterium lamp electrodes, which can affect the stability and service life of the light source.