PureAire Monitoring Systems, Inc.
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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, “hysteresis” may be required for the alarm
relays. This menu will permit the setting of the alarm hysteresis 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 hysteresis 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 would set the Alarm Threshold at 15.2% and set the
hystersis value at 0.3%.
Average Alarm set point = 15.2% - Hysteresis 0.3% = 14.9%, Valve Off
Average Alarm set point = 15.2% + Hysteresis 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 Hysteresis
. 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 hysteresis value is selected.
Press
ENTER
to accept this value. The digital display will revert back to
Set Alarm 1
Hysteresis.
..Set Audio Alarm Threshold…
20.9%
..Set Alarm Hysteresis…
20.9%
0.3%
20.9%
..Set Alarm 1 Hysteresis…
20.9%
