Metek 920, Operator'S Manual With Essential Health And Safety Requirements

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4-60 | Model 920 Multi-Gas Analyzer
Manual Start of Auto-Zero
A manual start of the Auto-Zero resets the AZInt Timer to its initial value.
The start of the next Auto-Zero will be timed from the beginning of the
manual start.
Example:
The AZInt Timer is set at 2 hours, the time remaining until the next timed
Auto-Calibration is 30 minutes, and the Auto-Calibration is started manu-
ally. In this case, the
AZInt Timer will be reset, and the time remaining
until the next timed Auto-Zero remains 2 hours.
Pressing Esc at any time during this procedure will abort the func-
tion and return to CAL mode normal display.
To manually start the Auto-Zero (from CAL mode):
1. Press F1 0 to display the timer duration.
2. Press Ent . The software prompts “ Auto/Zero? ”.
3. To enable the Auto-Zero, press Ent .
Timer0 will begin to count down to ‘ 0 ’. The analyzer Zero Offset is ad-
justed automatically based on the average of the readings during the
IntTime duration (or the last 15 seconds of the countdown if IntTime
= 0 seconds).
Or, press Esc to abort the Auto-Zero; the Zero Offset is not adjusted.
Upon completion of the sequence, enter another command, or press Esc
to return to RUN mode normal display.
Timed Start of Auto-Zero
The analyzer automatically initiates the Auto-Zero on a timed basis. The
AZInt timer sets the time interval between Zeroes.
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NOTE