Servomex NanoTrace DF-760E, Инструкция по эксплуатации

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User Interface DF-760E 77
The process measurement mode can be restored at anytime during the calibration process
by pressing
ESC
or it will be automatically restored at the end of the AutoZero process.
Before the AutoZero process can be started various criteria must be set using the AutoZero
Setup screen Figure 67. See page 77 for additional information.
After selecting “
Do an AutoZero
” from Figure 64 a screen similar to Figure 66 will
appear. Throughout the zero process the screen displays the current moisture reading as
well as the valve status and selected zero criteria. A graphical timer begins counting down
from 20 minutes. During the 20 minute cycle, the analyzer applies stability criteria. If after
20 minutes the moisture reading has acceptable stability the analyzer automatically accepts
the reading, updates the
Zero Reference
, and returns to the Data Display Screen. If the
reading is not stable, the analyzer continues the stability monitoring until the criteria has
been met or until the cycle timer expires. In the latter case, the analyzer returns to
operation on sample gas with no adjustment to the zero calibration and reports a failed zero
calibration. See the section on AutoZero Setup below for a description of the
Cycle
Timeout
function. The Zero Ref in the Check/Adjust Zero screen may change as a result
of this process. Pressing ESC during the calibration process will abort the action. The user
may also restore the factory calibration from the Check/Adjust Zero screen.
A relay is available on the Oxygen Analog Output Setup Screen (see page 98) to signal
that a zero calibration is taking place. Also, the analog output signal can either be frozen or
allowed to update during the calibration process.
7.6.2.2 AutoZero Setup
Use the
Next
key to move from between fields and use the arrow keys ( and

to
change the highlighted selections and to enter numerical values. When done, use the
Next
key to move to the
Accept
button and hit the
Enter
key to return to the main display.
Using the
ESC
key at anytime will exit the screen making no changes and return to the
main display.
Figure 67: Oxygen AutoZero Setup Screen
Oxygen AutoZero Setup
allows for unattended, automatic zeroing of the moisture
analyzer at preset times.