Cleaning the sample compartment
~
~In the event a test tube breaks in the sample
compartment, it is important to remove the glass and
any spilled liquid as soon as possible.
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~
~
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Figure 3-2 Location of photo diode
KEY
1. Photodiode
2. Connection wire
3. Lamp
4. Filter
10.
Close the door and tighten the thumbscrew.
11. Check the calibration of the insuument using the
procedures below or call your local Spectronic
Insuuments service organization, if necessary.
Wavelength Calibration Check
1. Turn off and uplug the instrument.2.
Use protective equipment (safety goggles, gloves,
lab coat, etc.).
3. Using tweezers, remove broken pieces of glass from
the sample compartment.4.
While supporting the instrument, move it to the edge
of the lab bench so that the lamp access door may be
opened.
5. Loosen the lamp access door thumbscrew and
carefully open the door. Spilled fluid may be present
inside. Make sure to clean up all liquid that was
spilled.6.
Reach inside the lamp compartment and remove any
remaining glass.
7. Tip the instrument back on the lab bench and clean
the sample compartment with an appropriate
cleaning solvent.
8. Visually inspect the lamp, photodiode or phototube,
and filters to determine if any liquid has spilled on
them. Refer to Figure 3-2 or Figure 3-3.
9. Remove any liquid spilled on the lamp, filter,
photodiode or phototube surfaces:
.Lamp, filter and phototube surfaces: Clean
with a soft cloth or the softest area of a cotton
swab and glass cleaner
.Photodiode: The photodiode is easily
damaged; cleaning should be performed by your
Spectronic Instruments service organization.
Clean the photodiode only if liquid is spilled on
it. Use very light pressure with the softest
area of a cotton swab dipped in high-grade
isopropyl alcohol. Do not touch the wire
connected to the detector.
Under nonnal operating conditions, the
SPECTRONI~ 20+ and 20D+ spectrophotometers
should retain their wavelength accuracy indefinitely. If
the instrument is subjected to a severe shock or other
abuse, wavelength performance may be checked by one
of three methods:
.Cobalt solution check
.Didymium filter from the Accessory Filter Kit (Cat.
No. 333129)
.Wavelength Accuracy Test from SPECTRONIC'I
Standards (Cat. No. 333150)
An explanation of the cobalt solution check follows.
Instructions on use of the didymium filter and
SPECTRONIC!> Standards are found in the user's
manual for each accessory.
3-2
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