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M300EU TROUBLESHOOTING & REPAIR
(Addendum to M300EU Manual - P/N 04145)
11.3. GAS FLOW PROBLEMS
Along with the information found in Section 11.2 of the M300E/EM Operators Manual (P/N 04288), also be
aware that problems with the flow of gas through the Nafion
®
dryer could also be a cause of pressure or flow
problems through the M300EU. Poor gas flow or leaks related to the dryer can also cause it to not dry the
sample gas efficiently allowing extra H
2
O to interfere with the analyzer’s CO measurements.
In addition to the checks described in the M300E/EM Operators Manual
• Check for blockages in the dryer.
• Check for leakage in and around the dryer and its fixtures (both the wet gas stream and the purge gas
inlets/outlets.
If it becomes necessary to replace the Nafion
®
dryer, contact Teledyne Instruments’ Customer Service (see
Section 11.6) for parts and instructions.
11.4. OTHER PERFORMANCE PROBLEMS
The information found in Section 11.4 of the M300E/EM Operators Manual (P/N 04288) is applicable to the
M300EU with the following addition.
11.4.1. Unexplained DRIFT
Because the M300EU makes higher resolution CO measurements than the M300E/EM, subtle issues with
certain subsystems that would be unimportant for the M300E/EM can affect its accuracy: The most common of
these are:
• Temperature Coefficient issues related to the motherboard’s A-to-D converter
• Age related changes to some of the optical bench components (e.g. the mirrors, the IR source, the IR
detector, etc.)
• Ambient changes in the condition of the instrument or the sample gas.
If a drift problem exists and calibrating the instruments zero and span points does not correct the problem or
there is no obvious component failure, perform the following operations in order:
1. Let the analyzer run un interrupted for at least 2 hours
• This will ensure that the entire oven area and all of the components therein have reached an equal
and stabile temperature.
2. Perform an Internal A-to-D Converter calibration (see Section 6.13.6.5 of the M300E/EM Operators
Manual).
• This should solve any issues related to the A/D converter.
3. Perform a Dark Calibration of the Optical Bench (see Section 6.13.7.2 of the M300E/EM Operators
Manual).
• This should account for any issues related to changes in the optical bench components.
4. Manually initiate an A-REF cycle (see Section 6.4.2).
• This should account for any issues related to changes in the ambient conditions of the sample gas.
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