GE OptiSonde User Manual page 61

Procedure for Cleaning
and Balancing the Sensor
Mirror (cont.)
Maintenance
5. If the square is not in the center of the balance bar, use the screw
or hex driver to adjust the optical bias screw (shown in Figure 5-3
below) on the sensor until the marker is in the center of the bar.
You are performing a coarse balance adjustment.
Sensor Balance
adjustment screw
Model 1111H
Figure 5-3: Balance Adjustment Screw Locations
IMPORTANT:
This adjustment is made while the cap or cover is on
the 1111H & D2 sensors. For the 1211, the
adjustment is made with the cap removed. In these
cases the adjustment should not be made in sunlight,
bright incandescent or infrared light. It might be
useful to shade the sensor cavity with your hand or
place a coin over the sensor cavity.
October 2007
Model D2
Model 1211H
5-3