ROTRONIC MBW 473 - Manual (Page 46)

42 MBW473_MANUAL_E_V2.0
7.3 Mirror Cleaning
At the heart of the 473 is the measuring head assembly. It is highly sensitive and accurate, yet easily
accessible for periodic mirror cleaning. To ensure high accuracy, the mirror should be cleaned before
starting a measurement. Inspect the mirror carefully. Use a magnifying glass, if necessary. If there are
signs of contamination or if you suspect that contamination is present, use the following procedure to
clean the mirror.
SH2 Measuring Head
To access the mirror and the opto-electronic compo-
nents, remove the measuring head cover.
The cover looks like a large, tan-colored knurled knob.
To remove it, simply turn it counterclockwise. It re-
quires approximately three full turns to completely
unscrew it.
Once the screw cover has been removed, remove the
black optical assembly (optical head) by pulling it
straight towards you. The loose half is the optical as-
sembly containing the light emitting and light sensing
opto-electronic elements and the gold contacts. The
other half contains the mirror, temperature sensor, and
some mating gold contacts. Avoid touching the mirror
and gold contacts with your fingers to prevent contam-
ination.
Clean the mirror with a clean cotton swab or a lint free
tissue.
Never attempt to polish the mirror.
If necessary clean the mirror with metha-
nol or alcohol. Then clean the mirror with
distilled water to ensure the cleaning
chemicals are completely removed from
the mirror surface.