Controller / User Interface | 4-47
Auto-Zero
This feature allows you to initiate an automatic calibration. Enter the Zero
gas mixture component concentrations before initiating an Auto-Zero.
When an Auto-Zero is performed, the following events occur
automatically:
1. The Zero gas solenoid valve is turned on to let the Zero gas mixture
flow through the Measuring Cell. The User Interface gives no indica-
tion that the solenoid valve has been turned on.
2. The Timer0 duration is displayed on the top line of the User Interface
and begins counting down to ‘0’.
3. The analyzer Zero is adjusted to the proper value based on the aver-
age of the readings during the last 25 percent of the Timer0 duration
(minutes) of the countdown if AdjDisable is set to ‘0’. Upon comple-
tion of the Auto-Zero, the CAL mode normal display is returned. The
IntTime does not affect the averaging time for the Auto-Zero.
4. The Auto/Manual relay will stay on longer, determined by the SDelay
timer, to allow for a smooth transition from the Zero gas mixture back
to the sample gas. The User Interface gives no indication that this is
occurring.
Pressing Esc at any time during this procedure will abort the func-
tion and return to CAL mode normal display.
The Flow Control mode must be controlled by the analyzer (i.e.,
FlowCtrl must be set to ‘0’).
The Auto-Zero can be started manually, automatically on a timed basis,
or by a remote dry (potential-free) contact closure. Upon completion of
the sequence, the Auto/Man status relay will continue to indicate that a
calibration is in process until the SDelay time has expired.
An Auto-Zero initiated on a timed basis or by a remote contact will
not be executed if there is a fault alarm.
NOTE
NOTE
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