Maxtec R229P01-024 Bedienungsanleitung Seite 9

A low alarm condition will remain until the actual concentration is 0.1% higher than the
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low alarm setting.
A high alarm condition will remain until the actual concentration is 0.1% lower than the
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high alarm setting.
To 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. An additional press 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 backlight 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.
Batteries are still required in the unit and will provide emergency power in the event main AC
power is lost.
NOTE: Use only the Maxtec external power supply described 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 MaxBlend 2 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 MaxBlend 2. Calibration should also be performed
upon replacement of a sensor.
The sensor is best calibrated while mounted in the MaxBlend 2 sensor port. As in normal
operation, the oxygen sensor responds best when installed in a vertical position with the sen-
sor 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 the 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 recalibrate after changing
point-of-use elevation by more than 500 feet (150m).
It is best to calibrate the MaxBlend 2 using the sensor port with a technical grade oxygen
standard (99.0% or better). Calibration of the unit with room air is less accurate over the full
FiO2 operating range.
To calibrate to 100% oxygen:
1. Connect the oxygen supply line (pressure differential alarm may sound). Verify the
sensor is plugged into the O2 sensor port and connected to the sensor cable. DO NOT
connect air supply line at this time.
2. Using the ON/OFF key, make sure the MaxBlend 2 is in the power on mode.
3. Rotate the FiO2 control knob to the 100% stop. Allow a few minutes for the reading to
stabilize.
4. 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.
5. Press the CAL (Calibration) key on the keypad. The word "CAL" will appear on the
display for approximately 5 seconds and then finish with 100.0%.
6. The unit is now calibrated and in the normal operating mode.
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2.8.2 Calibration to Room Air
The MaxBlend 2 can quickly be calibrated to room air (20.9%).
To calibrate to room air:
1. Connect the air supply line (pressure differential alarm may sound). Verify the sensor
is plugged into the O2 sensor port and connected to the sensor cable
connect oxygen supply line at this time. (If preferred, room-air calibration may be
performed by removing the sensor from the O2 sampling port and detaching the flow
diverter. If using this method, the gas-supply lines may remain attached.)
2. Using the ON/OFF key, make sure the MaxBlend 2 is in the power on mode.
3. Rotate the FiO2 control knob to the 21% stop. Allow a few minutes for the reading to
stabilize.
4. 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.
5. Press the CAL (Calibration) key on the keypad. The word "CAL" will appear on the
display for approximately 5 seconds and then finish with 20.9%.
6. The unit is now calibrated and in the normal operating mode.
2.9 Flowmeter Operation
1. Adjust the flowmeter to the desired setpoint as read by the center of the float ball.
To increase flow—turn knob counter-clockwise
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To decrease flow—turn knob clockwise
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2. Check the toggle bleed switch to ensure it is in the appropriate position.
For a low flow blender the bleed toggle switch should be turned on (up
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position) if the total combined flow from the blender is less than 3LPM.
For a high flow blender the bleed toggle switch should be turned on (up
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position) if the total combined flow from the blender is less than 15LPM.
At delivered flows greater than the above limits, the bleed toggle switch can
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be turned off (down position) to conserve gas.
CAUTION: Failure to activate the bleed as described above may result in inaccurate oxy-
gen concentrations from the blender. However, the MaxBlend 2 will always display the actual
delivered concentration.
CAUTION: The outlets of this device are capable of delivering pressure as high as the inlet
pressure. Ensure that the devices that carry the gas from the blender to the patient prevent
excessive pressure to the patient.
3.0 PERFORMANCE CHECK
Prior to placing the MaxBlend 2 into clinical use, perform the following tests.
WARNING: If the MaxBlend 2 does not function as described on the next page, contact
your Maxtec Distributor or contact a Maxtec Certified Service Technician at:
Maxtec
2305 South 1070 West
Salt Lake City, UT 84119
(385) 549-8000 or (800) 748-5355
DO NOT use the MaxBlend 2 until correct performance has been verified.
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DO NOT
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