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Principles of Operation Teledyne API T703/T703U Calibrator Operation Manual
212
Table 9-3: Photometer Measurement / Reference Cycle
TIME INDEX STATUS
0 sec. Measure/Reference Valve Opens to the Measure Path.
0 – 2 sec.
Wait Period. Ensures that the Absorption tube has been adequately flushed of any
previously present gasses.
2 – 3 sec.
Analyzer measures the average UV light intensity of O
3
bearing Sample Gas (I) during
this period
.
3 sec. Measure/Reference Valve Opens to the Reference Path.
3 – 5 sec.
Wait Period. Ensures that the Absorption tube has been adequately flushed of O
3
bearing gas.
5 – 6 sec.
Analyzer measures the average UV light intensity of Non-O
3
bearing Sample Gas (I
0
)
during this period
.
CYCLE REPEAT EVERY 6 SECONDS
Figure 9-18: T703 O
3
Photometer Gas Flow – Measure Cycle
07223C DCN6572