Teledyne 9110TH - Nitrogen Oxides Analyzer - Manual (Page 186)

Model 9110TH NOx Analyzer Calibration Procedures
Teledyne Analytical Instruments 166
5.2. CALIBRATION PREPARATIONS
5.2.1. REQUIRED EQUIPMENT, SUPPLIES, AND EXPENDABLES
Calibration of the Model 9110TH/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
2
diffusing into
the tubing.
 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.
5.2.2. ZERO AIR
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
X
measuring devices, zero
air should be devoid of NO
X
and large amounts of CO
2
, NH
3
and water vapor. Water
vapor and moderate amounts of NH
3
can be removed using a sample gas conditioner
(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.