Calibration Procedures
Model 100E Instruction Manual
128
045150102 Rev XB1
measurement range is 500 ppb, the span gas should have an SO
2
concentration of about
450 ppb.
We strongly recommend that span calibration is carried out with SO
2
span gas, although
it is possible to use a permeation tube such as that included in the IZS valve option.
Span gases should be certified to a specific accuracy to ensure accurate calibration of the
analyzer. Typical gas accuracy for SO
2
gases is 1 or 2 %. SO
2
standards should be mixed
in nitrogen.
7.1.4.
Permeation Tubes
T-API offers an IZS option operating with permeation devices. The accuracy of these
devices is about ±5%. Whereas this may be sufficient for quick, daily calibration checks,
we recommend to use certified SO
2
gases for accurate calibration.
Note
Applications requiring US-EPA equivalency do not allow permeation devices to
be used as sources of span gas for calibration of the analyzer.
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.
Table 7-1: NIST-SRM's Available for Traceability of SO
2
Calibration Gases
NIST-SRM
4
Type
Nominal
Concentration
1693a
1694a
1661a
Sulfur dioxide in N
2
Sulfur dioxide in N
2
Sulfur dioxide in N
2
50 ppm
100 ppm
500 ppm
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 M100E’s serial or analog outputs. If analog readings are
used, the response of the recording system should be checked against a NIST traceable
voltage source or meter. Data recording device should be capable of bi-polar operation so
that negative readings can be recorded. For electronic data recording, the M100E
provides an internal data acquisition system (iDAS), which is described in detail in
Section 6.10.
Summary of Contents for 100E
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Page 20: ...M100E Documentation Model 100E Instruction Manual 18 045150102 Rev XB1 User Notes ...
Page 26: ...Specifications Approvals and Warranty Model 100E Instruction Manual 24 045150102 Rev XB1 ...
Page 46: ...Getting Started Model 100E Instruction Manual 44 045150102 Rev XB1 User Notes ...
Page 128: ...Operating Instructions Model 100E Instruction Manual 126 045150102 Rev XB1 User Notes ...
Page 156: ...EPA Protocol Calibration Model 100E Instruction Manual 154 045150102 Rev XB1 ...
