Controller / User Interface | 4-21
Flow Control
The analyzer gas flow control can operate in one of six “sample”
modes. Normal analyzer operation is “Auto” mode.
Auto The analyzer is under automatic control. Sample gas is
continuously switched through Column A and Col-
umn B, respectively, when the analyzer is operating
normally. Upon analyzer start-up and Fault alarm con-
ditions (such as “Fail Relay” triggered), the flow control
will be automatically placed into Shut-in mode by the
analyzer.
Col A The analyzer is under user control and sample gas is
continuously forced through Column A.
Col B The analyzer is under user control and sample gas is
continuously forced through Column B.
Sample The analyzer is under user control and sample gas is
continuously switched through Column A and Col-
umn B respectively.
Shut-in The analyzer is under user control and no sample gas is
allowed to flow through the sample system.
Zero The sample system is continuously purged with Zero
gas.
A-Z Interval (hr)
The Auto-Zero Interval timer controls the interval between timed
Auto-Zero sequences. The timer can be set from 0–999 hours in one-
hour increments (default = 24 hours). Setting the timer to ‘0’ turns the
timer off, disabling a timed start of the Auto-Zero sequence. The time
remaining until the next Auto-Zero (minutes) can be viewed on the
Analyzer Data tab.
A-Z Duration (min)
The Auto-Zero Duration timer controls the amount of time that the
zero solenoid is active during an Auto-Zero. The time can be set from
0–255 minutes (default 4 minutes) in one-minute increments. Setting
the time to ‘0’ turns the timer off.
Cal Int Time (sec)
The Calibration Integration timer controls the integration time dur-
ing which the concentration reading for each species is averaged.
The timer can be set from 0–65535 seconds in one-second increments
(default 90 seconds). Setting the timer to ‘0’ changes the timer default
to a 30-second averaging time.
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