Teledyne 9110EH - Nitrogen Oxides Analyzer - Manual (Page 127)

Model 9110EH Instruction Manual Calibration Procedures
7. CALIBRATION PROCEDURES
This chapter describes calibration procedures for the M9110EH. All of the methods described
here can be initiated and controlled through the front panel or the COM ports.
NOTE
If you are using the M9110EH for US-EPA controlled monitoring, see Chapter 8 for
information on the EPA calibration protocol.
7.1. Calibration Preparations
The calibration procedures in this section assume that the range mode, analog range and
units of measure have already been selected for the analyzer. If this has not been done,
please do so before continuing (Section 6.5 for instructions).
7.1.1. Required Equipment, Supplies, and Expendables
Calibration of the Model 9110EH analyzer requires a certain amount of equipment and
supplies. These include, but are not limited to, the following:
• Zero-air source (defined in Section 3.3.2).
• Span gas source (defined in Section 3.3.1).
• 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.
7.1.2. 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 5.9).
Devices such as the 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.
7.1.3. Span Gas Standards
As explained in detail in Section 3.3.1, 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 500 ppb, the span gas should have an NO
concentration of about 400 ppb.
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