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EPA Protocol Calibration T400 Ozone Analyzer Operator’s Manual
218
10.5. SUMMARY OF QUALITY ASSURANCE CHECKS
Essential to quality assurance are scheduled checks for verifying the operational status
of the monitoring system:
The operator should visit the site at least once each week.
A Level 1 zero and span check must be made on the analyzer every two weeks.
Level 2 zero and span checks should be conducted at a frequency desired by the
user.
In addition, an independent precision check between 0.08 and 0.10 ppm may be required
at least once every two weeks.
Table 10-1 summarizes the quality assurance activities for routine operations. A
discussion of
each activity appears in the following sections.
To provide for documentation and accountability of activities, a checklist should be
compiled and then filled out by the field operator as each activity is completed.
Table 10-1: Daily Activity Matrix
CHARACTERISTI
C
ACCEPTANCE LIMITS
FREQUENCY AND
METHOD OF
MEASUREMENT
ACTION IF
REQUIREMENTS ARE NOT
MET
Shelter
Temperature
Mean temperature between 22C
and 28C (72F and 82F), daily
fluctuations not greater than 2C.
Check thermograph chart
daily for variations not
greater than 2C (4F).
Mark strip chart for the
affected time period.
Repair/adjust temp control.
Sample
Introduction
System
No moisture, foreign material, leaks,
obstructions; sample line connected
to manifold.
Weekly visual inspection.
Clean, repair or replace as
needed.
Recorder
Adequate ink supply and chart
paper.
Legible ink traces.
Correct settings of chart speed and
range switches.
Correct time.
Weekly visual inspection.
Replenish and chart paper
supply
Adjust recorder time to agree
with clock note on chart.
Analyzer
Operational
Settings
Flow and regulator indicators at
proper settings.
Temperate indicators cycling or at
proper levels.
Analyzer in sample mode.
Zero/span controls locked.
Weekly visual inspection. Adjust or repair as needed.
Analyzer
Operational
Check
Zero and span within tolerance limits
as described in Subsec. 9.1.3 of
Sec. 2.0.9
(Ref. 11).
Level 1 zero and span
every 2 weeks; Level 2
between Level 1 checks
at frequency desired by
user.
Isolate source error, and
repair.
After corrective action,
recalibrate analyzer.
Precision Check
Assess precision as described in
Sec. 2.0.8 (Ref. 11).
Every 2 weeks,
Sec. 2.0.8 (Ref. 11).
Calculate, report precision,
Sec. 2.0.8 (Ref. 11).
06870C DCN6332