Zero/Span Check Procedures; Precision Check - Teledyne T300 Operation Manual

EPA Calibration Protocol

10.2.1. ZERO/SPAN CHECK PROCEDURES

10.2.2. PRECISION CHECK

236
The Zero and Span calibration can be checked in a variety of different ways. They
include:
•
Manual Zero/Span Check - Zero and Span can be checked from the front panel
touchscreen. The procedure is in Section 9.3 of this manual.
•
Automatic Zero/Span Checks - After the appropriate setup, Z/S checks can be
performed automatically every night. See Section 9.3 of this manual for setup and
operation procedures.
If using the AutoCal feature to perform a calibration check, set the CALIBRATE
parameter to NO.
•
Zero/Span checks via remote contact closure = Zero/Span checks can be initiated
via remote contact closures on the rear panel. See Section 9.3.3.3 of this manual.
•
Zero/Span via RS-232 port - Z/S checks can be controlled via the RS-232 port. See
Section 9.3.3.3 and Appendix A-6 of this manual for more details.
A periodic check is used to assess the data for precision. A one-point precision check
must be carried out at least once every 2 weeks on each analyzer at a CO concentration
between 8.0 ppm and 10.0 ppm.
The analyzer must be operated in its normal sampling mode, and the precision test gas
must pass through all filters, scrubbers, conditioners, and other components used during
normal ambient sampling.
The standards from which precision check test concentrations are obtained must be
traceable to NIST-SRM. Those standards used for calibration or auditing may be used.
To perform a precision check during the instrument set up, the sources of zero air and
sample gas and procedures should conform to those described in Section 9.2 for
analyzers with no valve options or with an IZS valve option installed and Section 9.3.1
for analyzers with Z/S options installed with the following exception:
•
Connect the analyzer to a precision gas that has a CO concentration between 8.0
ppm and 10.0 ppm. If a precision check is made in conjunction with a zero/span
check, it must be made prior to any zero or span adjustments.
•
Record this value.
Information from the check procedure is used to assess the precision of the monitoring
data; see CFR 40 CFR 58
Teledyne API – Model T300/T300M CO Analyzer
5
for procedures for calculating and reporting precision.
06864B DCN6314