Ecotech A Series User Manual

CHAPTER 3, CALIBRATION
98307600 Rev. C-1 3-13
4. Temporarily set the RANGE to equal the chosen OVER RANGE.
5. Check the zero and set the span as described in section 3.2.
6. Generate several concentration standards and determine the slope, intercept,
and linearity of the higher OVER RANGE.
7. Reset the RANGE to the normal monitoring range.
8. Generate several concentration standards (including zero air) and determine
the slope, intercept, and linearity of the lower RANGE.
Note
Once the span has been set on the higher range, no further
adjustment should be made on the lower (normal)
monitoring range.
9. Reset OVER-RANGING to ENABLED to reactivate the over-ranging feature.
3.4 Automatic Zero/Span Checks (AZS)
Over time, the calibration of the instrument may change slightly (drift) causing
error in the measured values. Accordingly, good quality assurance practice
requires that the calibration of the EC9830 be checked periodically and, if
necessary, that the instrument's zero and span be adjusted to restore accurate
calibration.
3.4.1 U.S. EPA Definitions
Section 2.0.9 of the QA Handbook for Air Pollution Measurement Systems
defines two types of calibration checks: a Level 1 check and a Level 2 check.
A Level 1 zero and span calibration check is an authoritative assessment of the
analyzer calibration, using a CO span gas standard that is certified traceable to an
SRM or CRM, and the results of the Level 1 check can be used to adjust the
analyzer zero and span to restore accurate calibration.
A Level 2 zero and span check is an informal calibration check, often with an
uncertified CO standard, used to monitor the day-to-day relative readings of the
analyzer. The results of a Level 2 check must not be used to adjust the analyzer
calibration, but may indicate the immediate need for a more authoritative Level 1
calibration check.

Ecotech A Series Specifications

General

Brand	Ecotech
Model	A Series
Category	Measuring Instruments
Language	English