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Instruction Manual
IM-106-5500, Original Issue
August 2005
5-3
CCO 5500
Receiver
1. Turn the power OFF and remove the receiver from its air purge.
2. Remove the receiver cover from the front flange.
3. Remove the four screws holding side detector PCB to the main body of
the receiver (M4 x 16 screws).
4. Completely remove the four M6 bolts from the end detector PCB.
5. Slide out the gas cell assembly.
6. Replace the gas cell, ensuring that the same orientation is kept - the
notch in the gas cell assembly should be facing away from the side on
which the side detector PCB fits.
7. Reverse the above process being careful not to overtighten the four
bolts (if these are too tight the gas cell may fracture).
8. Turn the power ON and recalibrate. Refer to Section 4, Calibrate.
Electronics The electronics require no routine maintenance. They are all solid state and
undergo a rigorous factory burn-in procedure. If there is any doubt about the
equipment performance the signal processor may be interrogated from the
keypad to determine whether or not the equipment is functioning normally.
Refer to Section 6, Troubleshooting.
SPAN FACTOR
ADJUSTMENT
The span factor does not normally need adjusting. However, if any of the
following changes have taken place it may be necessary to adjust it:
1. Gas cell changed either in the receiver or the transmitter.
2. Interference filter changed in the receiver.
The procedure for changing the span factor in these cases is as follows:
1. Set the span factor to 1000 in Mode 5.
2. Calibrate the analyzer under zero conditions.
3. Obtain a check cell reading in Mode 6 [note that the check cell is defined
at a temperature of 68
o
F (20
o
C) and a pathlength of 3.28 ft (1 m)].
4. Set the temperature input in Mode 5 normalization to Keypad 68
o
F
(20
o
C).
5. Enter the pathlength in Mode 5. Note that the check cell reading must
be less than 999 ppm.m; if it is greater than this, use a larger pathlength
to reduce the effective ppm.m value of the check cell (i.e. select the
pathlength such that ppm.m/pathlength <999).
6. In Mode 5 under the span factor menu enter the value read for the
check cell in Mode 6. Note that if this value exceeded 999 ppm divide by
the pathlength entered above.
7. Press Enter and wait for the second reading to appear under the span
factor option. This should read the same as the value entered above.
8. Using the up and down arrow keys adjust the span factor until the
second reading agrees with the certified check cell value (divided by the
pathlength if appropriate).
9. Note the span factor value and press Enter.
10. Confirm the span factor is set by entering Mode 2 and checking span
factor under the parameters menu option.