Maintenance and Troubleshooting | 6-17
2. If the analyzer uses measured Pressure Compensation (optional),
change the pressure compensation to fixed mode so that a “f: Sample
gas pressure too low” alarm does not occur. To do this, view the Cell/
Misc Parameters dialog box and enter a value in the Default Cell
Pres (pressure compensation) field that is the same as, or approxi-
mately, the Measuring Cell pressure. Refer to “Cell/Miscellaneous
(Compensation) Parameters” in Chapter 4.
Close the isolation valve on the Sample Line or Sample Probe (if used).
Backpurge the analyzer sample system with Zero gas for 2–3 minutes.
3. Change the Flow Control setting to ‘1’ (shut-in/off). Click OK then
Apply.
Bleed down the sample system to atmospheric pressure (check gauge).
Close the valve on the Vent Line (or cap the Vent outlet).
If the sample system does not have an isolation valve, Zero gas may
continue to flow. Shut off the Zero gas.
4. Disconnect AC power to the analyzer and power down the computer
before performing maintenance on the analyzer.
5. Remove the existing lamps:
a. Remove the (24) M10 screws from the Upper Enclosure door and
open it.
b. Loosen – but do not remove – the (2) M3 x 8 screws on the Optical
Bench Microcontroller mounting bracket.
Swing the Microcontroller/Micro-Interface board assembly
outward.
c. Loosen the Lamp Retaining Screw on the bottom of the lamp sock-
ets and rotate the Lamp Retaining Bracket 90 degrees. Remove the
Lamp Socket.
d. Remove each lamp by rotating and sliding it downward. If neces-
sary, loosen the Lamp Clamping Screw on the Lamp Compression
Bar.
Do not rotate or pull on the base of the source lamp because this may
cause it to separate from the glass envelope. Grasp the glass envelope
when rotating or pulling the source lamp.
Setup (tab)Cell/Misc
NOTE
!
CAUTION
To Next Page
Loading...
