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alarm condition still exists 120 seconds after silencing the audio buzzer, the
beeper will start to sound again.
A low alarm condition will remain until the actual concentration is 0.1% higher
than the low alarm setting. A high alarm condition will remain until the actual
concentration is 0.1% lower than the high alarm setting.
To help differentiate the level of severity, the Monitor provides three unique
sound bursts.
2.6 Backlight Operation
To turn on the backlighting:
1. When the unit is on, pressing the Backlight button will turn the backlighting
on for 30 seconds. Additional presses will turn off the backlighting.
2. If the device is being used in a dark location, any button press will activate
the backlight.
CAUTION: Excessive use of the back light can reduce the life of the batteries.
2.7 External Power Supply Operation
To extend the life of the batteries an external Maxtec approved 7.5V DC
external power supply can be purchased. Once connected to the unit, total
power is supplied by the power supply. The batteries are still required to be in
the unit and will provide emergency power in the event main AC power is lost.
NOTE: Use only the Maxtec external power supply called out in section 10.0.
NOTE: The power supply is not a battery charger. DO NOT use rechargeable batteries.
2.8 Calibration Procedures
2.8.1 Calibration to 100% Oxygen
The MAXBlend2 should be calibrated before being placed into clinical use.
Thereafter, Maxtec recommends calibration of the unit on a weekly basis. Frequent
calibration will have no adverse effect on the performance of the MAXBlend2.
Calibration should also be performed upon replacement of a sensor.
The sensor is best calibrated while mounted in the MAXBlend2 sensor port.
As in normal operation, the oxygen sensor responds best when installed in a
vertical position with the sensor facing down.
Changes in barometric pressure can affect the oxygen reading.
A 1% change in the barometric pressure results in an error of 1% of actual
reading (Example: If you are reading a 50% oxygen mix and the barometric
pressure drops from 1000mbar to 990mbar the reading will drop to 50%
x (990/1000) = 49.5%). Maxtec recommends that you re-calibrate after
changing point-of-use elevation by more than 500 feet (150m).
It is best to calibrate the MAXBlend2 using the sensor port, and with a
technical grade oxygen standard (99.0% or better). Calibration of the unit with
room air is less accurate over the full FiO
2
operating range.
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