Teledyne Initial Calibration of the GFC 7001E/EM, Interferents for CO2 Measurements

Getting Started Model GFC7001E Carbon Dioxide Analyzer

3.6.INITIAL CALIBRATION OF THE GFC 7001E/EM

To perform the following calibration you must have sources for zero air and span gas available for input into the sample port on the back of the analyzer. See Section 3.4 for instructions for connecting these gas sources.

The initial calibration should be carried out using the same reporting range set up as used during the analyzer’s factory calibration. This will allow you to compare your calibration results to the factory calibration as listed on the Final Test and Validation Data Sheet.

If both available iDAS parameters for a specific gas type are being reported via the instruments analog outputs e.g. CONC1 and CONC2 when the DUAL range mode is activated, separate calibrations should be carried out for each parameter.

Use the LOW button when calibrating for CONC1 (equivalent to RANGE1).

Use the HIGH button when calibrating for CONC2 (equivalent to RANGE2).

See Manual Addendum, P/N 06270 for more information on the configurable analog output reporting ranges.

NOTE

The following procedure assumes that the instrument does not have any of the available Valve Options

installed.

See Section 9.3 for instructions for calibrating instruments possessing valve options.

3.6.1.INTERFERENTS FOR CO2 MEASUREMENTS

It should be noted that the gas filter correlation method for detecting CO is subject to interference from a number of other gases that absorb IR in a similar fashion to CO. Most notable of these are water vapor, CO2, N2O (nitrous oxide) and CH4 (methane). The GFC 7001E/EM has been successfully tested for its ability to reject interference from of these sources, however high concentrations of these gases can interfere with the instrument’s ability to make low-level CO measurements.

For a more detailed discussion of this topic, see Section 11.2.1.3.

3.6.2.INITIAL CALIBRATION PROCEDURE FOR GFC 7001E/EM ANALYZERS WITHOUT OPTIONS

The following procedure assumes that:

The instrument DOES NOT have any of the available calibration valve or gas inlet options installed;

Cal gas will be supplied through the SAMPLE gas inlet on the back of the analyzer (see Figure 3-2), and;

The pneumatic setup matches that described in Section 3.4.2.

Teledyne Analytical Instruments 51