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2. Should oxygen level exceed either the HIGH or LOW alarm set points, the alarm
indicator on the front panel will illuminate indicating either a high or low oxygen
condition. The alarm will cease when oxygen levels are within limits, or the limits are
adjusted.
NOTE:
The MaxBlend 2 will monitor the oxygen concentration of the gas delivered from the
blender regardless of which outlet port is in use. Therefore, the integrated flowmeter has ulti-
mately no effect on the oxygen sensing.
2.3 Alarm Setting Procedure
2.3.1 Low Alarm Setting
To adjust the low alarm setting:
1. Press the Unlock key
to unlock the keypad. Note the LOW, SMART ALARM, CAL, and
HIGH icons will begin to flash indicating the SET OPERATING MODE.
2. Press the DOWN (Low Alarm) key
on the keypad.
NOTE:
The Low Alarm digits begin to flash indicating the Low Alarm manual setting.
3. Use the UP
and DOWN
keys to set the low alarm to the desired value.
Pressing the arrow keys changes the value in 1% increments. If the keys are held down
for more than 1 second, the display will scroll at a rate of 1% per second.
NOTE:
If 30 seconds elapse between key actuations, the system will store the latest low alarm
setting and will revert to normal operation. If this occurs inadvertently, simply repeat the
alarm setting procedure.
There is a special condition that allows the low oxygen alarm to be set below 18%. To access
this condition, press the DOWN arrow key for three seconds while the low alarm reading dis-
plays 18%. The alarm setting can now be adjusted to 17, 16, or 15%. A bar will blink above the
setting to provide further indication that the alarm has been set to this special <18% condition.
The low alarm value cannot be set lower than 15%, nor can it be set closer than 1% from the
high alarm value. For example, if the high alarm is set at 25%, the system will not accept a low
alarm setting greater than 24%.
When the low alarm value is set, press the Unlock key again to accept the low alarm setting
and return to normal operation.
NOTE:
The default low alarm setting is 18% O2. Removing the batteries, or shutting the unit OFF
will reset the low alarm limit to 18%.
2.3.2 High Alarm Setting
To adjust the high alarm setting:
1. Press the Unlock key to unlock the keypad. Note the LOW, SMART ALARM, CAL and HIGH
icons will begin to flash indicating the SET OPERATING MODE.
2. Press the UP (High Alarm) key on the keypad.
NOTE:
The High Alarm digits begin to flash indicating the High Alarm manual setting.
3. Use the UP and DOWN keys to set the high alarm to the desired value. Pressing the
arrow keys changes the value in 1% increments. If the keys are held down for more
than 1 second the display will scroll at a rate of 1% per second.
NOTE:
If 30 seconds elapse between key actuations, the system will store the latest high alarm
setting and will revert to normal operation. If this occurs inadvertently, simply repeat the
alarm setting procedure.
4. When the high alarm setting is set above 100%, the high alarm will indicate two dashes
– –. This special condition turns off, or deactivates, the high alarm.
5. When the high alarm value is set, press the Unlock again to accept the high alarm
setting and return to normal operation.
NOTE:
The default high alarm setting is 50% O2. Removing the batteries will reset the high
alarm limit to 50%.
2.3.3 Smart Alarm Mode
1. Press the Unlock Key
to unlock the keypad. Note the LOW, SMART ALARM, CAL, and
HIGH icons will begin to flash indicating the SET OPERATING MODE.
2. Press the Smart Alarm key
on the keypad. Note the LOW digits, Alarm Mode and
HIGH digits begin a slow flash indicating SMART ALARM MODE. The high alarm will now
be set equal to the current oxygen r3% (rounded to the nearest integer). The
low alarm will now be set equal to the current oxygen reading -3% (rounded to the
nearest integer, but never lower than 18%.
3. Pressing of the UP key
will add 1% to the high alarm setting and subtract 1%
from the low alarm setting. Pressing the DOWN key
will subtract 1% from the
high alarm setting and add 1% to the low alarm setting. In other words, the UP key
widens the alarm band and the DOWN key tightens the alarm band. This feature will
not set the alarm levels above 100% or below 18%.
4. Once the desired alarm settings are attained, press the Unlock key
again to save
the settings and return to normal operation mode. If 30 seconds elapse without a
key press by the user, the device will automatically save the latest alarm settings and
return to normal operation mode.
2.4 Basic Operation
To check the oxygen concentration of the delivered gas:
1. Ensure the sensor is connected to the flow diverter and inserted completely in the
sensor port behind the flowmeter.
2. Set the oxygen blender control knob to the desired oxygen setting.
3. Using the ON/OFF key
, make sure the unit is in the power on mode.
4. Allow the oxygen reading to stabilize.
5. Adjust the flowmeter to the desired flow rate. Read the flow rate at the center of the float ball.
2.5 Alarm Conditions and Priorities
In the event of either a low alarm or high alarm condition, the corresponding LED will begin
to flash, accompanied by the audio buzzer. Pressing the Silent key
will deactivate the
buzzer, but the LED and the alarm value digits on the display will continue to flash until the
alarm condition has been rectified. If the alarm condition still exists 120 seconds after silencing
the audio buzzer, the beeper will start to sound again.
ALARM
ALARM
PRIORITY
LOW
ALARM LED
HIGH
ALARM LED
AUDIBLE
ALARM
AUDIBLE
ALARM REPEAT
Line Power
Plugged In
Informational
Off
Off
2 Pulses
No Repeat
Line Power
Unplugged
Informational
Single
Yellow Pulse
Single
Yellow Pulse
2 Pulses
No Repeat
External DC
Power Supply
Voltage Out
of Range
Informational
Solid Yellow
Solid Yellow
2 Pulses
Every 15 Sec.
Battery Voltage
too low for
device to
operate (E04)
Medium
Pulsing
Yellow
Pulsing
Yellow
3 Pulses
Every 25 Sec.
Oxygen/
pressure level
above the high
alarm setting
Medium
Off
Pulsing
Yellow
3 Pulses
Every 25 Sec.
Oxygen/pressure
level below the
low alarm setting
Medium
Pulsing
Yellow
Off
3 Pulses
Every 25 Sec.
Oxygen level
below the low
oxygen alarm
setting and
lower than 18%
High
Pulsing Red
Off
5+5 Pulses
Every 15 Sec.
