Teledyne 9110EH - Nitrogen Oxides Analyzer - Manual (Page 236)

Troubleshooting & Repair Model 9110EH Instruction Manual
• When looking at the electronic circuits from the back of the analyzer, locate the
EEPROM chip in the left-most socket of the CPU board. The chip is almost square
with one corner cut off, the socket is shaped accordingly and the chip is recessed
into the socket. Remove the old chip by using a special tool or gently pry the chip
out using a very fine screwdriver. Make sure not to bend or destroy any of the
contacts of the socket. When upgrading the CPU with a second chip, no removal is
necessary as the second socket should be empty.
• Reinstall the new or additional EEPROM chip, making sure the cut-off edge matches
that of the socket. Press the chip symmetrically and straight all the way in.
• Close the rear panel and cover and turn on power to the machine.
• If a front panel message Flash Format INVALID appears on start-up, the EEPROM
was not properly formatted. Contact the factory for a proper replacement.
11.6.3. O
3
Generator Replacement
The ozone generator is a black, brick-shaped device with printed circuit board attached to
its rear and two tubes extending out the right side in the front of the analyzer. To replace
the ozone generator:
• Turn off the analyzer power, remove the power cord and the analyzer cover.
• Disconnect the 1/8” black tube from the white ozone scrubber cartridge and the ¼”
clear tube from the plastic extension tube at the brass fitting nearest to the ozone
generator. Unplug the electrical connection on the rear side of the brick.
• Unscrew the two mounting screws that attach the ozone generator to the chassis
and take out the entire assembly.
• If you received a complete replacement generator with circuit board and mounting
bracket attached, simply reverse the above steps to replace the current generator.
Make sure to carry out a leak check and a recalibration after the analyzer warmed up
for about 30 minutes.
11.6.4. Sample and Ozone Dryer Replacement
The M9110EH standard configuration is equipped with a dryer for the ozone supply air. An
optional dryer is available for the sample stream and a combined dryer for both gas
streams can also be purchased. To change one or all of these options:
• Turn off power to the analyzer and pump, remove the power cord and the analyzer
cover. Locate the dryers in the center of the instrument, between sensor and NO
2
converter. They are mounted to a bracket, which can be taken out when unscrewing
the two mounting screws (if necessary).
• Disconnect all tubing that extends out of the dryer assembly, those are usually the
purge tube connecting to the vacuum manifold, the tube from the exit to the ozone
flow meter (ozone dryer) or to the NO/NO
x
valve (sample dryer) or two tubes to the
ozone flow meter and the NO/NO
X
valve (combo-dryer). Take extra care not to twist
any of the white plastic fittings on the dryer, which connect the inner drying tube to
the outer purge tube. See Section 9.3.2 and Figure 9-2.
• Note the orientation of the dryer on the bracket. Cut the tie wraps that hold the
dryer to the mounting bracket and take out the old dryer. If necessary, unscrew the
two mounting screws on the bracket and take out the entire assembly.
222 M9110EH Rev 0