4-40 | Model 900 ADA / Model 930 Sulfur Pit Analyzers
Analyzer Control Mode
When the analyzer’s Flow Control mode is set to Analyzer Control, the
analyzer automatically determines and sets the mode of operation by
monitoring the state of the Fault alarm relay contacts.
If there are no active Fault alarms, the analyzer will operate in Analyzer
Control mode (automatic Sample). When in automatic Sample mode, there
is no indicating character on the User Interface.
If the analyzer detects a Fault alarm while it is operating in Automatic
Sample mode, is displayed on the top-right line of the User Interface.
When this occurs, the analyzer will switch to automatic Backpurge, and
“m” is displayed on the top-left line. The analyzer will not switch back to
automatic Sample mode until the cause of the alarm has been corrected
(cleared).
Because a low temperature is defined as a fault, the analyzer will switch to
automatic Backpurge mode for the length of time required for all tempera-
ture zones to stabilize at their Set Points.
To set the analyzer’s Flow Control mode to Analyzer Control mode and
return to CAL mode normal display, press:
CAL>F5 0 Del 0 Ent Ent
Continuous Backpurge/Zero Flow Mode (Manual Control by Operator)
When the analyzer’s Flow Control mode is manually set to Continuous
Backpurge/Zero Flow, the analyzer sample system is continuously back-
purged with Zero gas; it will not switch back to automatic Sample mode.
When you manually force the analyzer into Continuous Backpurge/Zero
Flow, “B” is displayed on the top-left line. To manually force the analyzer
to this mode, press:
CAL>F5 0 Del 1 Ent Ent
Continuous Backpurge/Zero Flow can also be initiated by an op-
tional remote dry (potential free) contact opening. In this case the ‘m’
character is displayed.
NOTE
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