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Thank you for purchasing this VEE GEE Polarimeter. With the user in mind, VEE GEE Polarimeters are built from
modern designs and, with proper care, this instrument should provide many years of reliable performance. It’s
recommended this manual is read entirely before using the polarimeter for the first time.
The VEE GEE Model C25L is designed to measure the angle of rotation caused by passing polarized light through
an optically active substance. Measurements can be made with an accuracy of ±0.1 by utilizing a large, ±180°,
full circle Vernier scale. Readings can be interpolated to ±0.05 by an experienced user.
This instrument features a long-life, energy-efficient LED light source with a 589nm filter. The LED light should last
the life of the instrument and therefore requires no regular replacement. The instrument is provided with 100mm
& 200mm sample cells.
Introduction
This polarimeter is a delicate optical instrument and requires an accurately aligned, internal optical path
for proper functioning. Do not shake or jolt the instrument. The impact may damage or cause the optical
components to shift which will result in inaccurate readings.
Do not attempt to open the body of the instrument as there are no user serviceable parts inside.
Please refer to the Service & Support section website for detailed info on returning your instrument for service.
Safety Precautions
Maintenance
Fuse Replacement
This instrument uses a 1A 250V (part number 1200-FS4) fuse which is located on the bottom of the instrument.
1. Turn the power switch off, labeled “0”, and unplug from the power outlet.
2. Remove any sample cells that may be present in the cell chamber and carefully
place the polarimeter on its side.
3. Using a Phillips or slot screwdriver unthread the fuse holder (figure 1) and visually
inspect the filiment inside the fuse. If the filiment is burnt or the inside of the fuse is
blackened then replace the fuse. Use only the correct fuse. NEVER use a fuse that is
rated higher than what came with the instrument.
4. Re-thread the fuse holder back into the base of the polarimeter.
Cleaning
1. The instrument should not be used in an overly humid environment and should be cleaned with a moist cloth
and mild detergent after use or when liquids have been spilled on it.
2. The polarimeter body can be cleaned using water and light detergent with a soft cloth or tissue. Do not use
harsh chemicals as this may damage the painted surfaces. Be sure to unplug the instrument from the power source
before cleaning. Do not immerse or allow large amounts of water to splash onto the instrument.
3. After each use, clean the sample cell in water and light detergent then wipe dry with a soft cloth or tissue and
allow to air dry.
4. Use only specially formulated lens cleaning fluids and tissues to clean the optical components of the instrument.
Failure to do so may result in scratched lens surfaces.
Figure 1
