2-17
Multipoint Sequencer Operation
In the sequencer setup screens, unneeded points can be de-activated
by using the RIGHT ARROW key and selecting the point to be de-
activated.
• When the change key is pressed, the number in the display
goes blank.
• After pressing OK, the display shows a dark diamond to indicate
which points are de-activated (see FIGURE 3-11).
In the sequencer setup screens, the monitor can be locked on a single
point by pressing CHANGE before the RIGHT ARROW key.
• After pressing the RIGHT ARROW key and OK, only the selected
point is indicated.
• After an hour (if no buttons are pushed), the monitor returns to
normal sequencer operation (see FIGURE 3-12).
When calibrating:
• the gas inlet point can be selected.
• an inactive point can be selected.
After leaving calibration:
• the monitor returns to the previous sequencer setup (FIGURE 3-4).
Chillgard RT operation with a sequencer has a normal dwell time of 30
seconds per sample line, or four measurement cycles.
To improve monitor performance in noisy environments and eliminate
false alarms
due to high noise, a user-selectable parameter "threshold"
was established.
• The factory value for this threshold is 30%.
• The threshold value is used with the Caution Alarm setpoint to
determine when additional readings must be made on the
current sample line to confirm actual concentration at the
sample point.
• The allowable adjustment range for the threshold value is
30% to 70%.
• If this value is greater or equal to the product of the threshold and
the Caution Alarm value, the monitor dwells for an additional 60
seconds or eight more measurement cycles.
• Raising the threshold above 30% prevents false alarms but also
requires greater gas concentrations to cause the Caution Alarm to
trip (see FIGURE 2-7).
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