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Teledyne API Model 201A NH
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Analyzer Instruction Manual, 04689, Rev. B1
Do NOT use copper tubing or fittings designed for household plumbing.
Use ONLY Chromatography grade (cleaned, passivated) stainless steel tubing
Use ONLY Glass tubing for sample inlet manifold.
These rules apply also to your calibrator’s internal plumbing. Verify that the calibrator
pneumatic pathway that contacts ammonia only uses stainless steel or glass tubing.
The M702SS calibrator supplied with the External Calibration Option is built with
stainless steel fittings and tubing for all internal plumbing wetted by NH3.
Typical ambient NH3 levels are < 15 ppb, unless there is some large source of
ammonia nearby, so the sampling and analysis system must be carefully designed and
well maintained.
1.1.2 Sample Filtration
The M201A does not come with a sample filter installed. Depending on the options
ordered, a sample filter may be separately packaged with the instrument. If the filter is
installed, the instrument response time is significantly increased, due to its large surface
area. Also, the condition of the filter (particulate loading and type) can adversely affect
the response time.
For minimum response time operation, the instrument should be supplied with clean
sample gas at ambient pressure.
If the sample filter is not included, the only additional filter in the M201A pneumatic
pathway is a ¼” dia stainless steel sintered filter used to protect the flow control orifice
from plugging. This filter will plug rapidly if the sample gas is not filtered before entering
the analyzer. Some means of filtering the sample gas, such as an external stainless
steel filter should be added upstream of the analyzer.
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