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EPA Calibration Protocol Model GFC7001E Carbon Dioxide Analyzer

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10. EPA CALIBRATION PROTOCOL

10.1. CALIBRATION REQUIREMENTS

If the GFC 7001E is to be used for EPA SLAMS monitoring, it must be calibrated in accordance with the

instructions in this section.

The USEPA strongly recommends that you obtain a copy of the publication Quality Assurance Handbook for Air

Pollution Measurement Systems Volume 2: Part 1, Ambient (abbreviated, Q.A. Handbook Volume II). This

manual can be purchased from:

 USEPA Order Number: EPA454R98004; or NTIS Order Number: PB99 129876.

 National Technical Information Service (phone 800-553-6847) or Center for Environmental Research

Information or the U.S. Government Printing Office at http://www.gpo.gov. The Handbook can also be

located on line by searching for the title at http://www.epa.gov.

 Special attention should be paid to Section 2.6 of that which covers CO analyzers of this type.

Specific regulations regarding the use and operation of ambient CO analyzers can be found in

Reference 1 at the end of this Section.

A bibliography and references relating to CO monitoring are listed in Section 10.6.

10.1.1. CALIBRATION OF EQUIPMENT - GENERAL GUIDELINES

In general, calibration is the process of adjusting the gain and offset of the GFC 7001E against some recognized

standard. In this section the term dynamic calibration is used to express a multipoint check against known

standards and involves introducing gas samples of known concentration into the instrument in order to adjust the

instrument to a predetermined sensitivity and to produce a calibration relationship.

This relationship is derived from the instrumental response to successive samples of different known

concentrations. As a minimum, three reference points and a zero point are recommended to define this

relationship.

All monitoring instrument systems are subject to some drift and variation in internal parameters and cannot be

expected to maintain accurate calibration over long periods of time. Therefore, it is necessary to dynamically

check the calibration relationship on a predetermined schedule. Zero and span checks

must be used to

document that the data remains within control limits. These checks are also used in data reduction and

validation.

Calibration can be done by either diluting high concentration CO standards with zero air or using individual tanks

of known concentration. Details of documentation, forms and procedures should be maintained with each

analyzer and also in a central backup file as described in Section 2.6.2 of the Quality Assurance Handbook.

The reliability and usefulness of all data derived from any analyzer depends primarily upon its state of calibration.

To ensure accurate measurements of the CO levels:

1. The analyzer must be calibrated at the time of installation and recalibrated as necessary.

2. In order to insure that high quality, accurate measurement information is obtained at all times, the

analyzer must be calibrated prior to use.

3. Calibrations should be carried out at the field-monitoring site.

4. The analyzer should be in operation for at least several hours (preferably overnight) before calibration

so that it is fully warmed up and its operation has stabilized.

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Teledyne GFC 7001E User Manual Page 217