Permeation Tubes; Calibration Gas Traceability; Data Recording Devices; Conversion Efficiency - Teledyne 200E Instruction Manual

Calibration Procedures
We strongly recommend that span calibration is carried out with NO span gas, although it is
possible to use NO or a gas phase titration (GPT) system. Quick span checks may be done
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with either NO, NO
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certified to a specific accuracy to ensure accurate calibration of the analyzer. Typical gas
accuracy for NO gases is 1 or 2%. NO standards should be mixed in nitrogen (to prevent
X
oxidation of NO to NO
it oxidized).
7.1.4. NO

Permeation Tubes

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T-API offers an internal zero / span (IZS) option operating with an NO
The accuracy of these devices is only about ±5%. Whereas this may be sufficient for quick,
daily calibration checks, we recommend to use certified NO gases for accurate calibration.
Note that US-EPA controlled applications do not allow permeation devices to be used for
calibration.

7.1.5. Calibration Gas Traceability

All equipment used to produce calibration gases should be verified against standards of the
National Institute for Standards and Technology (NIST). To ensure NIST traceability, we
recommend to acquire cylinders of working gas that are certified to be traceable to NIST
standard reference materials (SRM). These are available from a variety of commercial
sources.

7.1.6. Data Recording Devices

A strip chart recorder, data acquisition system or digital data acquisition system should be
used to record data from the serial or analog outputs of the M200E. If analog readings are
used, the response of the recording system should be checked against a NIST traceable
voltage source or meter. Data recording devices should be capable of bi-polar operation so
that negative readings can be recorded. For electronic data recording, the M200E provides
an internal data acquisition system (iDAS), which is described in detail in Section 6.9.10.
APICOM, a remote control program, is also provided as a convenient and powerful tool for
data handling, download, storage, quick check and plotting.
7.1.7. NO

Conversion Efficiency

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To ensure accurate operation of the M200E, it is important to check the NO
efficiency (CE) periodically and to update this value as necessary. The default setting for the
NO converter efficiency is 1.0000. For the analyzer to function correctly, the converter
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efficiency must be between 0.9600 and 1.0200 (96-102% conversion efficiency) as per US-
EPA requirements. If the converter's efficiency is outside these limits, the NO
should be replaced. The currently programmed CE is recorded along with the calibration
data in the iDAS for documentation and performance analysis (Section 6.10.2.1).
The following procedure will cause the Model 200E to automatically calculate the current
NO conversion efficiency.
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Step one is to connect a source of calibrated NO
110
or a mixture of NO and NO
over time), whereas NO
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Model 200E Instruction Manual
as is used in GPT. Span gases should be
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standards should be mixed in air (to keep
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span gas as shown below.
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permeation device.
2
conversion
2
converter
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044100102 Rev A