PureAire Monitoring Systems, Inc.
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P a g e
Pushing the joystick up increases the value and pushing the joystick down decreases the
value. Press
ENTER
to accept the value.
NOTE:
The O
2
system must have the audio alarm option module installed to access
this menu. If this option is installed the display will indicate N/A, (not available)
NOTE: The audio can be set into only one alarm level. You can choose between
alarm level 1 or alarm level 2 or set a completely different setting.
After entering the relay state the display will default back to the
Set Audio Threshold.
Menu. The display will scroll the following:
5.5.9 Set Alarm Hysteresis
PureAire’s oxygen monitor may be used as a control system. When used to regulate
oxygen levels the need of a dead band, “hysterisis” may be required. This menu will
permit the setting of the alarm hysterisis to a desired concentration of Oxygen. When
using hysteresis, the alarm set point now becomes an average alarm setting for an action
to occur. When adding the hysterisis value to the alarm set point, this then defines the
alarm and dead band for an action to occur.
For example, if you require a valve to close at 14.9% oxygen level and to reopen again
at 15.5% oxygen level, you will set the Alarm Threshold at 15.2% and set the hystersis
value at 0.3%.
Average Alarm set point = 15.2% - Hysterisis 0.3% = 14.9%, Valve Off
Average Alarm set point = 15.2% + Hysterisis 0.3% = 15.5%, Valve On
To access this menu push the joystick down to display the
Set Alarm Hysteresis
menu.
This will scroll on the digital display.
Push the joystick right to access the
Set Alarm 1 Hyserisis
. Pushing the joystick again
to the right will display a value 0.0%, (factory default). Pushing the joystick up
increases the percentage up to a maximum value of 2.5%. Adjust the digital display
until the desired hysterisis value is selected.
..Set Audio Alarm Threshold…
20.9%
..Set Alarm Hysteresis…
20.9%
0.3%
20.9%
