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Instruction Manual
IM-106-5500, Original Issue
August 2005
3-3
CCO 5500
Figure 3-1. Adjusting Nuts for
Alignment
3. Replace the receiver on its air purge. The next adjustment is done
using the detector levels as viewed from the signal processor.
4. To change mode on the signal processor the MODE key needs to be
pressed once to access each mode. Enter SET UP MODE (Mode 5) by
pressing the MODE key 4 times. 5 SET UP will then be displayed on
the LCD. Press ENTER to access the mode.
5. Because Mode 5 is used to configure the instrument, a security code is
used to prevent any unauthorized alteration of settings. The default
code set at the factory is 0000. The cursor will flash over the first digit
that should be altered using the arrow keys until the desired number is
displayed, press ENTER and the cursor will move onto the second digit.
Similarly alter and press ENTER when the desired number is displayed.
When the fourth digit has been correctly entered the processor will
enter Mode 5.
6. Within Mode 5 select the CALIBRATE menu using the arrow keys.
Press ENTER when calibrate is displayed.
7. Once again, use the arrow keys to select DISPLAY DETECTOR
LEVELS option and press ENTER to access. The D1 and D2 detector
levels will be displayed. Important - if not in this mode, the gas cell at
the source will periodically interrupt the IR beam and make alignment
difficult.
8. Adjust the alignment of the receiver by using the adjusting nuts. As for
the transmitter, the alignment is best conducted by adjusting in one
plane first, then in the other. As a 'rule of thumb', it will be observed that
the D2 detector level will be affected to a greater extent by adjustment
in one particular plane. Similarly, the D1 detector level will be affected
more by adjustment in the other plane.
9. Use this guide to ensure that the MAXIMUM possible values of both D1
and D2 are reached. After alignment has been achieved, lock the
flange into position using the locking nuts.
10. If the displayed detector level is below 5000, increase the gain from the
signal processor to about 10,000; if above 15,000, reduce to 10,000.
Refer to Detector Levels for details of this operation.
FRONT FLANGE
REAR FLANGE
LOCKING NUTS
ADJUSTING NUTS