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Theory Of Operation Teledyne API - T100H Addendum to T100 Operation Manual)
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9.2.2.3. Sample Flow Calculation
Unlike the T100, which uses a thermal-mass flow sensor to directly measure the gas flow though the instrument,
the T100H calculates the gas as follows.
The ratio of the two pressures is measured and used to validate critical flow. If the ratio is not correct (<
2:1) the SAMPLE FLOW WARN message is activated. Also, the value of the SAMP FL test function is
set to XXXX.
If the pressure ratio between the two sensors is valid ( 2:1), the instrument calculates the flow based on sample
gas pressure level (PRES) and is viewable via the front panel as the SAMP FL test function.
07265A DCN6038