Teledyne 9110T Data Recording Devices, Span Gas for Multipoint Calibration, Mandated monitoring

Model 9110T NOx Analyzer Calibration Procedures

∙The same applies to gases that contain high concentrations of other compounds (for example, CO2 or H2O).

Note	The span gas should match all concentrations of all gases of the
	measured medium as closely as possible.

Cylinders of calibrated NOx and NO gas traceable to NIST-standards specifications (also referred to as EPA protocol calibration gases or Standard Reference Materials) are commercially available. For a list of these gases see Table 3-8).

9.1.2.3. Span Gas for Multipoint Calibration

Some applications, such as EPA monitoring, require a multipoint calibration where span gases of different concentrations are needed. We recommend using an NO gas of higher concentration combined with a gas dilution calibrator such as a Teledyne Model T700. For more information see Section 3.3.2.1 and Section 10.

9.1.2.4. NO2 Permeation Tubes

TAI offers an optional internal span gas generator that utilizes an NO2 permeation tube as a span gas source. The accuracy of these devices is only about ±5%.

Whereas this may be sufficient for quick, daily calibration checks, we recommend using certified NO gases for accurate calibration.

Note	The use of permeation tubes is not approved by the US EPA as calibration
	sources for performing actual calibration of the analyzers used in EPA
	mandated monitoring.

CAUTION!

Insufficient gas flow allows gas to build up to levels that will contaminate the instrument or present a safety hazard to personnel.

In units with a permeation tube option installed, either the tube must be removed and stored in sealed container (use original container that tube was shipped in) during periods of non-operation, or vacuum pump must be connected and powered on to maintain constant gas flow though the analyzer at all times.

(See Figure 3-6 for location and Section 11.3.6 for instructions on how to remove the perm tube when the unit is not in operation).

9.1.3. 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 9110T.

∙If analog readings are used, the response of the recording system should be checked against a NIST traceable voltage source or meter.

Teledyne Analytical Instruments 196