Servomex NanoTrace DF-760E, Инструкция по эксплуатации

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80 DF-760E User Interface
Figure 69: Check Adjust Oxygen Span
7.6.2.4.1 Do A Manual Span
Figure 70: Oxygen Manual Span
A manual calibration can be performed after the span gas is connected to the oxygen span
inlet and the analyzer is stable. The pressure of the span gas should be 15 PSI. The O
2
flow rate for span should be set to match what they get when on process gas. This is
generally 0.2 – 0.3 LPM. After initiating a manual calibration, it may take up to five
minutes before convergence occurs and the 60 second time bar begins to move. During
convergence, the analyzer is verifying stability of the reading before accepting the data. If
the convergence does not occur within 5-10 minutes, check the following:

Make sure the gas connections are leak free.

Make sure the sensor has had sufficient time to attain a stable reading on the
calibration gas via a separate chart recorder.

Check the electrical connections to the sensor.
To automate this process, see the following section on AutoSpan checks and recalibrations.