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Teledyne API – T101 Operation Manual EPA Protocol Calibration
193
7.3. ZERO AND SPAN CHECKS
A system of Level 1 and Level 2 zero span checks (see Table 8-4) is recommended. These
checks must be conducted in accordance with the specific guidance given in Subsection
9.1 of Section 2.0.9 (Q.A. Handbook). It is recommended Level 1 zero and span checks
conducted every two weeks. Level 2 checks should be conducted in between the Level 1
checks at a frequency desired by the user. Span concentrations for both levels should be
between 70 and 90% of the measurement range.
Zero and span data are to be used to:
Provide data to allow analyzer adjustment for zero and span drift;
Provide a decision point on when to calibrate the analyzer;
Provide a decision point on invalidation of monitoring data.
Items 1 and 2 are described in detail in Subsection 9.1.3 of Section 2.0.9 (Q.A.
Handbook). Item 3 is described in Subsection 9.1.4 of the same section.
Refer to the Troubleshooting Section 10 of this manual if the instrument is not within the
allowed variations.
7.3.1. ZERO/SPAN CHECK PROCEDURES
The Zero and Span calibration can be checked a variety of different ways. They include:
Manual Zero/Span Check - Zero and Span can be checked from the front panel keyboard.
Follow the procedures described in Section 6.3 and6-6 of this manual using calibrated
SO
2
span gas (see Table 6-1) only.
Automatic Zero/Span Checks - After the appropriate setup, Z/S checks can be performed
automatically every night. Follow the procedure described in Section 6.9 of this manual
using calibrated SO
2
span gas (see Table 6-1).
Zero/Span checks via remote contact closure = Zero/Span checks can be initiated via
remote contact closures on the rear panel. Follow the procedures described Section 6.7.1
of this manual using calibrated SO
2
span gas (see Table 6-1).
Zero/Span via RS-232 port - Z/S checks can be controlled via the RS-232 port.
7.4. PRECISIONS CALIBRATION PROCEDURES AND
CHECKS
Calibration must be performed with a calibrator that meets all conditions specified in
Subsection 2.9.2 (Q.A. Handbook). The user should be sure that all flow meters are
calibrated under the conditions of use against a reliable standard. All volumetric flow
rates should be corrected to 25
o
C (77
o
F) and 760mm (29.92in) Hg. Make sure the
calibration system can supply the range of the concentration at a sufficient flow over the
whole range of concentration that will be encountered during calibration.
All operational adjustments to the T101 should be completed prior to the calibration. The
following software features must be set into the desired state before calibration.
07266B DCN6485