Fault phenomenon one
The visible area (ultraviolet area) of the instrument does not display 100.00, but only 0.000. The reasons for this kind of failure are: 1. The position of the halogen tungsten lamp (atmosphere lamp) is shifted, so that the light spot cannot accurately enter the slit. 2. Cutoff filter position offset.
For the former, by checking the position of the visible (ultraviolet) light spot on the slit, readjust the tungsten halogen lamp (neon lamp) assembly position to rule out! The latter can be ruled out by carefully adjusting the position of the light sheet.
Trouble phenomenon two
Close the sample chamber and turn on the instrument (the reference sample is air). The instrument displays 0.000 because the rotation position (offset) of the cut-off filter set is incorrect. When it is adjusted to 550nm, the concave mirror can be yellow and white and each half spot can be used.
Trouble phenomenon three
When the instrument is turned on, the full wavelength does not display 100.0, but only 0.000. The reasons are 1. The grating in the monochromator falls off 2. The sample slot is not positioned correctly. The former can be replaced with a grating, and the latter can be re-adjusted in the light path of the monochromator so that the light spot can enter the sample chamber through the exit slit correctly, and a groove filter is used to check the wavelength point by point to exclude it.
1. The boot does not work and the power indicator does not light up
Check whether the power cord plug, 2A fuse and power switch are in good order, and replace them if they are damaged.
2. The data display is unstable
Make sure that the warm-up time is more than 30 min, the power supply voltage is 220 V, and there are no sudden changes. If the instrument vibrates too much, it should be repositioned, installed and debugged.
3. Absorbance overflows and displays E2 or ∀∀∀∀
It is normal for the absorbance to overflow due to the high concentration of the tested solution, and it will disappear automatically after restarting the machine.
Check that the sample chamber is closed when the absorbance is blocked, otherwise the sample chamber should be closed.
4. Insufficient energy and display E
Confirm that the position of the sample cell is fixed and there is no foreign matter in it, and then observe whether the tungsten lamp is lit.
Reposition the tungsten lamp so that its spot is concentrated in the middle of the slit. Confirm by observation and replacement! After the 15 V power supply board and the preamplifier circuit board are in good condition, check whether the filter, reflector, grating, collimator, etc. in the optical path are dirty. If the above devices are dirty, wear special weighing gloves and carefully clean their surfaces. If the mirror is moldy, it needs to be replaced. When replacing, do not touch the mirror with your hands, and do not speak to the mirror, so as not to contaminate the mirror with saliva. Use the replacement method to check whether the photocell is in good condition. Adjust the optical path manually, and test the commonly used wavelength points one by one. Place the filter paper in the optical path of the sample chamber to detect various monochromatic lights output by the monochromator. The monochromatic light of each wavelength should correspond correctly. After closing the sample chamber, it can be adjusted to zero.
