Return on Assets This ratio indicates how profitable a company is relative to its total assets. The higher the return, the more efficient management is in utilizing its asset base. By dividing, the equation gives us an ROA of Some investment analysts use the net income figure instead of the operating income figure when calculating the ROA ratio.
Where exactly is this membrane located? How often if at all does this Problem analysis need to be replaced? Is there a way to detect a leaky membrane? Could this be related to the valve membrane? Hi Jamie, The valve you are describing is called the bi-matic valve, and it was used in older CE analyzers to inject the oxygen for sample combustion.
It was a six port switching valve which was air actuated.
There was a viton membrane in the valve which controlled the flow of gases in and out of the valve and it needed to be replaced every few years.
The NC does not have the bi-matic valve. In the NC electrovalves control the flow of gases and are used to inject the oxygen for combustion. The SS plate on top of the NC will get rather hot when you are running the analyzer. The insulation between the furnace and the top of the analyzer is not very good, so heat collects beneath the SS plate and is somewhat transferred to the bottom of the autosampler.
Recently, we have been noticing small dropouts below the baseline, which affect peak area calculations. The dropouts are not consistent with any events e. In the process of chasing down the culprit, the slide in the autosampler has been replaced, new combustion and reduction reactors installed, as well as replacing the separation column.
The problem still persists. Have you ever seen anything like this? Is it possibly an electronics problem? Thank you for your attention.
A few questions we have for you are: Is this instrument connected to a mass-spectrometer? If you are able to, please send us one of these chromatograms by email or fax: The NA is not attached to a mass-spec.
At this point it does seem to be an electronics or power issue. Is it possible that there is some new or temporary piece of heavy equipment in or near the building?
One of our customers found that the equipment used by some painters working nearby the lab caused sporadic electrical problems with his instrument. A good test would be to get a hold of a strip chart recorder and check the instruments output that way. I do have a voltmeter attached to the unit and can monitor the baseline that way.
I was also wondering if you supplied Acetanilide as a standard for this also.
Is it possible that you could send me information about what is available to purchase and possibly a catalogue of similar consumables. We already bought the CHN machine for you. Could you tell me the code of it? The PC is seeing the chromcard, and it has found the security key.
The connections are all good. Could it be that the configuration has changed? What is the baud rate set to for an ? I would greatly appreciate any insights. I recently bought your pre-packed reactor for CHNS.
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Did I buy the correct tube? The copper is in a long wire form instead of copper chips. Also, the tube is clear where as when we packed our own tubes, we used the opaque quartz tube.
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