Servomex DF-310E, Руководство оператора

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88 DF-310E User Interface
necessary to select Update and Quit to make the reset permanent.
8.6.3.2.3 Zero Cal(ibration)
Selecting Zero Cal will result in the display shown in Figure 58.
Figure 58: Zero Cal Warning Screen
Note: The zero baseline stabilization criteria is only verifying stability over a short time scale
(1-5 minutes). The output on zero gas should be recorded (by manual or strip chart technique)
and stability should be monitored over a much larger time scale (18 to 24 hours for 0-1000 ppm
and lower range High Resolution Analyzers). Only when it is clear that the Oxygen reading has
reached a constant minimum value should a zero calibration be attempted.
When any key is pressed, the display will show Figure 59 without the OFFSET line. This screen
will be overwritten with a "WAIT..." message for about ten seconds and then the OFFSET: line
will appear. Two beeps will sound when the “WAIT...” message clears. When the offset is
stable, the instrument will sound two short beeps and display a "STABLE" message on the blank
line below ZERO CAL. The user has the option to accept the new offset value by pressing the
key, or not accepting the new offset value by pressing the ESC key. With either choice, the
display will return to the SENSOR ZERO Menu as seen in Figure 57.
Figure 59: Zero Cal Screen
Pressing the ESC key at any time aborts the process and returns the user to the SENSOR ZERO
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