Principles of Operation Teledyne API T703/T703U Calibrator Operation Manual
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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 O3 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 O3
bearing gas.
5 – 6 sec. Analyzer measures the average UV light intensity of Non-O3 bearing Sample Gas (I0)
during this period.
CYCLE REPEAT EVERY 6 SECONDS
Figure 9-18: T703 O3 Photometer Gas Flow – Measure Cycle
07223C DCN6572