Calibration Preparations; Required Equipment, Supplies, And Expendables; Zero Air; Span Calibration Gas Standards & Traceability - Teledyne T200H User Manual

Calibration Procedures

5.2. CALIBRATION PREPARATIONS

5.2.1. REQUIRED EQUIPMENT, SUPPLIES, AND EXPENDABLES

5.2.2. ZERO AIR

5.2.3. SPAN CALIBRATION GAS STANDARDS & TRACEABILITY
Note
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Calibration of the Model T200H/M analyzer requires a certain amount of equipment and
supplies. These include, but are not limited to, the following:
•
Zero-air source (defined in Section 3.5.1.1).
•
Span gas source (defined in Section 3.5.1.2).
•
Gas lines - all gas line materials should be stainless steel or Teflon-type (PTFE or
FEP). High concentration NO gas transported over long distances may require
stainless steel to avoid oxidation of NO with O
•
A recording device such as a strip-chart recorder and/or data logger (optional). For
electronic documentation, the internal data acquisition system can be used.
Zero air is similar in chemical composition to the Earth's atmosphere but scrubbed of all
components that might affect the analyzer's readings. For NO
air should be devoid of NO
vapor and moderate amounts of NH
(Section 5.10).
Devices such as the API Model 701 zero air generator that condition ambient air by
drying and removal of pollutants are available. We recommend this type of device for
generating zero air. Please contact our sales department for more information on this.
We strongly recommend that span calibration is carried out with NO span gas,
although it is possible to use NO
NO, NO or a mixture of NO and NO
2
Span gas is specifically mixed to match the chemical composition of the gas being
measured at about 80% of the desired full measurement range. For example, if the
measurement range is 120 ppm, the span gas should have an NO concentration of about
96 ppm.
Span gases should be certified to a specific accuracy to ensure accurate calibration of the
analyzer. Typical gas accuracy for NO
mixed in nitrogen (to prevent oxidation of NO to NO
For oxygen measurements, we recommend s reference gas of 21% O
can either utilize the NO
be used at an assumed concentration of 20.8%. Generally, O
ambient air varies by less than 1%.
Teledyne API - Model T200H/T200M Operation Manual
and large amounts of CO
X
can be removed using a sample gas conditioner
3
. Quick span checks may be done with either
2
.
2
gases is 1 or 2%. NO standards should be
X
standards (if mixed in air). For quick checks ambient air can
X
diffusing into the tubing.
2
measuring devices, zero
X
, NH and water vapor. Water
2 3
over time).
2
in N
2
concentration in dry,
2
07270D DCN7141
. the user
2