4-42 | Model 900 ADA / Model 930 Sulfur Pit Analyzers
Setting Calibration Gas Timers
The analyzer uses four independent timers for automatic calibration. Each
timer establishes the duration for which a solenoid valve controlling the
Calibration Gas mixture is energized during Auto-Zeroes and Auto-Spans.
The duration depends on the time required for the Calibration Gas mix-
ture to reach the analyzer and to obtain a stable reading.
Integration Timer (IntTime)
The IntTime sets the duration over which the readings are averaged dur-
ing manual calibrations. The IntTime duration can be set from 0–65535
seconds in one-second increments. Set the duration to ‘0’ to use the de-
fault averaging time of 15 seconds.
Example:
To set IntTime to 25 seconds and return to CAL mode normal display,
press:
F3 6 Del 25 Ent Ent
Timer0
Timer0 sets the duration the analyzer Zero gas solenoid valve is turned
on during the Auto-Zero. Timer0 can be set from 0–255 minutes in one-
minute increments. Set the duration to ‘0’ to turn the timer off, and
disable the Auto-Zero. The average reading for Auto-Zero will be taken
during the last 25 percent of the Timer0 time period.
Timer0 must be assigned a value that allows the signals to be stable
during the last 25 percent of the countdown.
Example:
To set Timer0 to 2 minutes (allowing a 30-second averaging time) and
return to CAL mode normal display, press:
F3 0 Del 2 Ent Ent
If a Calibration Gas is not used, the associated timer must be turned
Off.
NOTE
NOTE
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