SECTION III. OPERATOR MAINTENANCE PROCEDURES
3.2. TEST FOR SAMPLE CELL MATCH.
This task covers: Inspection/Testing
Cell, Sample G-10-0029, 2 each, See Appendix C
High voltage used with Spectrophotometer. Misuse can cause electrical shock and damage
equipment. When operating with 115V or 220V power, make sure the power source and
equipment are in ground potential. Ensure that the power cable connections are correct for the
desired voltage power before connecting the power source.
Make sure sample cells(7, fig. 2-5) are clean and dry.
Set up and operate the Spectrophotometer (para 2.6.2).
Push the on/off toggle switch(12) to ON and allow unit to warm up for 2 minutes.
Place the % Transmittance Absorbance meter scale card(2) into the meter(fig 2-6). Adjust the wavelength
dial(8, fig. 2-5) to 510 nm.
Hold the on/off toggle switch(12) in the ZERO CHECK position and turn the ZERO ADJUST knob(l 1) until
the meter scale(14) reads 0% transmittance.
Place one sample cell in the sample cell well(5), and adjust the LIGHT CONTROL knob(l0) until the meter
scale(14) reads 95% transmittance. Rotate the sample cell 180 degrees, and read the transmittance value
on the meter scale(14). Record the result.
Place the second sample cell in the sample cell well(5) and record the transmittance value on the meter
scale(14). Rotate the cell 180 degrees and record the result.
If any one of the three meter readings recorded taken in step (6) and (7) above are either below the lower
limit of 94% transmittance or above the upper limit of 96% transmittance, repeat the test. If a second test
confirms that readings are outside the limits, replace both cells.
Refer to para 2.6.2 for shut down of the Spectrophotometer.