Servomex NanoTrace DF-760E, Инструкция по эксплуатации

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User Interface DF-760E 79
Figure 68: Oxygen GSF Screen
It is advantageous to use a span gas with the same background gas as the process gas to
minimize stabilization time and reduce the probability of measurement error.
A relay is available on the Oxygen Output Setup Screen (see page 97) to signal that a span
or zero calibration is taking place, and the analog output signal can also be frozen or
allowed to update during the calibration process.
7.6.2.4 Check/Adjust Span
The Span Reference value is a reflection of the deviation from the original factory
calibration. Instruments are shipped from the factory with the Span Reference set to 1000.
After a manual or autospan is performed this value may change. NOTE: The Span
Reference Value should not fall outside the range of 500 to 1500. If the value is outside
this range, contact Servomex.
Attach a span cylinder to the oxygen span inlet fitting on the rear of the analyzer and
supply 10 - 15 psig (0.7 – 1.0 barg).
Use the NEXT key to toggle through the various user fields.
The value of the calibration gas can be entered directly in the Span Gas box after using
the arrows to highlight Enter Span Gas Value and hitting NEXT . Only values less than
10 ppm are accepted.
To turn the span valves on, use the arrows and move to Set Span Valves and hit Apply.
Then move to Do A Manual Span and hit Apply.
If Do An AutoSpan Check is highlighted and the APPLY button is hit, an additional box
appears which allows input of a Check Limit . This field is used in the AutoSpan Check
process as described on page 81.
A relay is available on the Oxygen Output Setup Screen (see page 97) to signal that a span
or zero calibration is taking place, and the analog output signal can also be frozen or
allowed to update during the calibration process.