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11
ENGLISH
Similar to other oxygen sensors, the Maxtec MAX series sensors measure the partial pressure
of oxygen in a gas stream. This is correlated to read “percent oxygen” on the MaxO2 ME moni-
tor. It is important to note that the sensor output is directly proportional to the partial pressure
of oxygen. Thus, one must take into consideration the effect of exposing the sensor to various
gas sample pressures.
For example, if a monitor is calibrated to read 20.9% in ambient air (atmospheric pressure) and
then exposed to a pressurized gas sample containing a known concentration of oxygen, the
monitor will display a reading greater than the actual oxygen percentage.
This is because the monitor was originally calibrated at atmospheric pressure (0 PSIG) then
exposed to a higher pressure sample (i.e., 5 PSIG).
The greater the difference in pressure, the greater the difference in sensor signal (oxygen
reading on the monitor).
If a monitor is calibrated on a pressurized gas sample containing a known concentration of
oxygen and then exposed to ambient air (atmospheric pressure), the monitor will display a
reading less than the actual oxygen percentage.To avoid confusion, the monitor can be cali-
brated at a single point on a gas stream similar to the application. If, for example, the purpose
of the monitor is to measure oxygen in a concentrator or anesthesia application, the optimal
results may be attained by calibrating the instrument on a gas of similar concentration and
pressure. This would typically be done by connecting to a cylinder of a known high concentra-
tion of oxygen calibration gas and adjusting the flow and pressure to match the application
before calibrating the instrument.
8.3 Calibration Errors
The MaxO2 ME monitor has a self test feature built into the software to detect faulty cali-
brations. During calibration, if the signal from the oxygen sensor is outside the limits stored
within the instrument’s memory, a flashing E01 or E05 error code is displayed. The error code
is displayed to indicate that either the sensor should be replaced or that there is a fault in the
calibration process. A few simple hints can prevent calibration errors. If you try to calibrate the
monitor before the reading has stabilized, the E01 or E05 error code may appear. For example,
if the monitor had just been calibrated on a known high concentration of oxygen source gas
and then exposed to ambient air, you should wait until the reading has stabilized.
If you try to calibrate in room air before the sample line has cleared, the sensor may actually
be exposed to residual oxygen. The signal from the sensor would still be high and considered
out of range for air, thus resulting in an E05 or E07 error code. The proper procedure is to wait
for the reading to stabilize before calibration.
Also note that the monitor may sense that the concentration is changing and an E07 error
code will display.
Sensors come supplied with a flow diverter. The flow diverter helps direct the gas in a
T-adapter up to the sensor for analysis. The flow diverter should be only used with a flowing
gas. When using the sensor in a non-flowing environment, remove the diverter tip.
9.0 SPARE PARTS AND ACCESSORIES
PART NUMBER
ITEM
R140P02
Max-550E Sensor
R228P87
Battery Cover
R228P16
Sensor Cable
R228P10
Kickstand
R230M01
MaxO2 ME Operation Manual
R207P17
Barbed Concentrator Adapter for Sensor
PART NUMBER
ITEM
R205P86
Monitor/Analyzer Wall Mount Bracket
R206P75
Monitor/Analyzer Pole Mount Clamp
RP16P02
Maxtec Approved Tee Adapter (15mm I.D.)
R110P10-001
Sensor Flow Diverter
R230P10
Maxtec Approved External Power Supply
Repair of this equipment must be performed by a Maxtec Certified Service Technician experi-
enced in repair of portable hand held medical equipment.
Equipment in need of repair should be sent to:
Maxtec
Service Department
2305 South 1070 West
Salt Lake City, Ut 84119
1.800.748.5355
(Include RMA number issued by Customer Service)
10.0 ELECTROMAGNETIC
COMPATIBILITY
The information contained in this section (such as separation distances) is in general specifi-
cally written with regard to the MaxO2 ME monitor. The numbers provided will not guarantee
faultless operation but should provide reasonable assurance of such. This information may
not be applicable to other medical electrical equipment; older equipment may be particularly
susceptible to interference.
Note: Medical electrical equipment requires special precautions regarding electromagnetic
compatibility (EMC) and needs to be installed and put into service according to the EMC infor-
mation provided in this document and the remainder of the instructions for use this device.
Portable and mobile RF communications equipment can affect medical electrical equipment.
Cables and accessories not specified within the instructions for use are not authorized. Using
other cables and/or accessories may adversely impact safety, performance and electromag-
netic compatibility (increased emission and decreased immunity).
Care should be taken if the equipment is used adjacent to or stacked with other equipment;
if adjacent or stacked use is inevitable, the equipment should be observed to verify normal
operation in the configuration in which it will be used.
ELECTROMAGNETIC EMISSIONS
This equipment is intended for use in the electromagnetic environment specified below.
The user of this equipment should assure that it is used in such an environment.
EMISSIONS
COMPLIANCE
ACCORDING TO
ELECTROMAGNETIC ENVIRONMENT
RF Emissions
(CISPR 11)
Group 1
The MaxO2 ME uses RF energy only for its
internal function. Therefore, its RF emissions
are very low and are not likely to cause any
interference in nearby electronic equipment.
