25
Note:It is recommended that you refresh the Dark Current (refer to Page21) before check.
Stray Light Check
Specification: Less than 0.3%T at 340nm by ASTM E 387
A good indication as to whether the stray light level is within specification may be obtained as follows:
1. Set the wavelength to 340nm.
2. Select BASIC MODE With the sample compartment empty, close the lid and press the 0A/100%T
key to set the LCD display to 100.0%.
3. Prepare a solution containing 50gm/L of sodium nitrite (NaNO
2
) in distilled water and fill a square
cuvette with this solution.
4. Place the cuvette in the sample compartment. Close the lid. The display should read<0.3%T.
Note:It is recommended that you refresh the Dark Current (refer to Page21) before check.
Trouble Shooting:
PROBLEM
Possible
Solution
Instrument Inoperative
Power cord not connected to
outlet
Plug instrument in.
Dead Power outlet Change to a different outlet
Internal fuse blown or defective
electronic component
Call an authorized service engineer.
Improper power setting Set to the main power
Instrument cannot set
100%T (0.000A)
Light beam blocked Check sample holder. See if holder is
properly positioned and nothing is blocking
light path.
Lamp is misaligned. Check to see if light is positioned properly on
entrance slit to monochromator. Call
Technical Service for details (800-588-9776).
Defective electronic component. Call an authorized service engineer.
Incorrect
Transmittance to
Absorbance correlation
Bubbles or particles in solution. Check sample preparation and analytical
procedure.
Defective electronic component. Call an authorized service engineer.
LCD Digital Display
does not change
regardless of sample
concentration
Concentration reading “frozen”. Sample Solution too Dark ,
dilute it and
Restart measurement procedure.
Wrong wavelength setting. Check sample procedure and wavelength
setting.
Insufficient sample volume. Fill cuvette with more sample.
Stray sample preparation vapors. Prepare the sample away from the
instrument. Use proper ventilation.
Bubbles or particles in solution. Check sample preparation and analytical
procedure.
Defective electronic component
or loose wiring.
Call an authorized service engineer.
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