Teledyne 9110E - Nitrogen Oxides Analyzer - Manual (Page 165)

Model 9110E Instruction Manual Instrument Maintenance
M9110E Rev B 151
• Pour the contents of the cartridge onto a sheet of white paper. Notice any
discoloration of the contents, which is usually white and slightly transparent. Note
how much of the chemical is discolored (usually with yellow tint), this may give you
an indication of the lifetime of the chemical in your application. The maintenance
cycle of this item is dependent on ambient moisture, sub-micron particle load and
other factors and may differ from that shown in Table 9-1.
• Discard the used chemical without touching it. It may contain nitric acid, which is a
corrosive and highly irritating substance. Immediately wash you hands after contact.
• Using a small powder funnel, fill the cartridge with about 10 g new chemical (TAPI
part # CH43) so that it is level on both legs of the cartridge. Slight vibration is
required to settle the chemical into the cartridge and achieve tightest packing, which
increases performance and lifetime of the filter. Make sure that the level of the
chemical does not protrude farther than the first two threads of the NPT fitting.
NOTE
Use only genuine, pre-conditioned Teledyne-API refill kits for this procedure.
Do not leave this material uncovered for more than a few seconds, as it will
absorb contaminants from ambient air!
• Seal the chemical with one plug of glass wool on each side. Ensure that the plug is
large enough and compressed into the cartridge so that the chemical is securely held
in place.
• Screw the NPT fittings back into the cartridge using a layer of new Teflon tape.
• Screw the cartridge back onto the chassis, orientation is not important.
• Evaluate the ferrules on the tubing. If the ferrules are too old, we recommend to
replace them with new ferrules.
• Reconnect the tubing using 7/16” and 9/16” wrenches. Do not over-tighten the
fittings.
• If the service interval for this item has been exceeded, it may also be necessary to
clean the reaction cell as described in Section 9.3.9.
• Leak check the system using the pressurized approach described in Section 11.5.2.
You can use soap leak detector liquid to evaluate if the cartridge is not tight. If
necessary, tighten the fittings some more but do not over-tighten.
• Restart the analyzer and pump and continue operation.
• If the chemical used for replacement has not been conditioned properly or was
stored over long periods of time or was exposed to ambient air, you may see a
significant increase of the AutoZero value, slowly diminishing over time. Until
diminished, this may cause large negative offsets on calibration and a changing
calibration over time. It may take 2-3 weeks to clean the material properly, hence,
we recommend to use genuine Teledyne-API refill kits to ensure minimum
downtimes.
• Re-calibrate the analyzer after one hour (Chapter 7). If AutoZero is high, you may
have to wait day until calibration.
9.3.4. Rebuilding the External Sample Pump
The sample pump head periodically wears out and must be replaced when the RCEL
pressure exceeds 10 in-Hg-A (at sea level, adjust this value accordingly for elevated