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Teledyne API T703/T703U Calibrator Operation Manual Calibration and Verification
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5. Turn OFF the calibrator, remove the pressure monitor, replace the cap on the
pressure measurement fitting.
6.4. GAS FLOW CALIBRATION
The T703/T703U has two gas flow characteristics that affect its performance: the flow
of gas through the sample chamber of the instrument’s photometer and the total gas flow
being output. While both are stored in the calibrator’s memory and used to compensate
the final concentration calculations for changes in atmospheric pressure, they are
calculated quite differently:
CALCULATING THE PHOTOMETER SAMPLE GAS FLOW RATE
This flow rate is measured directly by a flow sensor located pressure / flow sensor PCA.
A slope factor, stored in the calibrator’s memory the last time a PHOTO FLOW
calibration operation (see Section 6.4.1) was performed, is and applied to the reading
from that sensor.
07223C DCN6572