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This ISM device complies with Canadian ICES-001.
Cet appareil ISM est conforme à la norme NMB-001 Canada.
Nellcor Puritan Bennett Inc. is an affiliate of Tyco Healthcare. Nellcor, Oxiband, Durasensor,
OxiCliq, OxiBand, Dura-Y, MAX-FAST, SatSeconds, PediCheck, Oxismart and O
XIMAX are
trademarks of Nellcor Puritan Bennett Inc.
To obtain information about a warranty, if any, contact Nellcor’s Technical Services Department,
or your local representative.
Purchase of this instrument confers no express or implied license under any Nellcor Puritan
Bennett patent to use the instrument with any sensor that is not manufactured or licensed by
Nellcor Puritan Bennett.
Covered by one or more of the following U.S. Patents and foreign equivalents: 4,621,643;
4,653,498; 4,700,708; 4,770,179; Re. 35,122; 4,802,486; 4,869,254; 4,928,692; 4,934,372; 5,078,136;
5,351,685; 5,368,026; 5,485,847; 5,533,507; 5,662,106; 5,853,364, and 6,083,172.
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Contents
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .i
Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .vi
Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Warnings .................................................................................1
Cautions ..................................................................................2
Notes .......................................................................................3
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Intended Use for the N-550 .....................................................5
Description of Controls, Indicators, and Symbols . . . . . . . . . . . . . . . . . . 7
Identification of Front Panel Buttons and Symbols ..................7
Identification of Rear Panel Components ................................8
N-550 Symbols ........................................................................8
Description of Controls ............................................................9
Description of Displays and Indicators ..................................11
Description of Audible Indicators ...........................................13
Setting up the N-550 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
List of Components ...............................................................16
Connecting the N-550 to AC Power ......................................17
Connecting a Sensor to the N-550 ........................................17
Battery Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Operating the N-550 on Battery Power .................................19
Low Battery Indicator .............................................................20
Using the N-550 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Turning on the N-550 ............................................................21
Discussion ....................................................................21
Procedure ....................................................................21
Sensor Attached ..........................................................24
No Sensor Attached .....................................................26
Sensor Message ...................................................................26
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Contents
Setting the Pulse Beep Volume ............................................ 27
Setting the Alarm Volume ..................................................... 28
Setting Alarm Silence Duration .............................................28
Discussion ................................................................... 28
Procedure .................................................................... 29
Disabling Audible Alarms ......................................................30
Discussion ................................................................... 30
Procedure .................................................................... 30
Verify Patient Settings ...........................................................31
Alarm Limits Changed Indicator ............................................33
Setting Alarm Limits ..............................................................34
Discussion ................................................................... 34
Procedure .................................................................... 34
Setting SatSeconds Duration ................................................36
Discussion ................................................................... 36
Procedure .................................................................... 36
Setting the Data Port Baud Rate ...........................................37
Discussion ................................................................... 37
Procedure .................................................................... 37
Setting the Data Port Protocol ..............................................39
Clearing Trend Information ...................................................40
N-550 Trend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
Trend Data Operation ........................................................... 43
Trend Data ............................................................................43
#1: Trend Print .............................................................44
#2: Trend Clear ............................................................44
#3: Not Used ................................................................44
#4: Baud Rate ..............................................................44
#5: Data Port Printout .................................................. 45
Option 1 ..............................................................45
Option 2 ..............................................................45
Using the Data Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
Overview ............................................................................... 47
Connecting to the Data Port ..................................................47
Data Port Pinouts ..................................................................48
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Contents
Data Port Setup .....................................................................49
Discussion ....................................................................49
Procedure ....................................................................50
Nurse Call Interface ...............................................................53
Setting Nurse Call RS-232 Polarity ..............................54
Setting Nurse Call Relays Normally Open/Closed .......54
Printing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Printing N-550 Real-Time Data .............................................57
Trend Data Printout ...............................................................59
Column Headings ........................................................60
Data Source .................................................................61
Device/Software Revision Level ..................................61
Alarm Limits .................................................................61
N-550 Mode .................................................................62
Data Column Headings ................................................62
Time .............................................................................62
Patient Data .................................................................63
Operating Status ..........................................................63
Sensors and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Selecting a Sensor ................................................................65
Biocompatibility Testing .........................................................68
Optional Accessories .............................................................68
Foot Switch ..................................................................69
Visual Alarm Indicator ..................................................69
Pole Mount Bracket ......................................................70
Performance Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Performance Verification .......................................................71
N-550 Performance Considerations ......................................71
Dysfunctional Hemoglobins .........................................72
Anemia .........................................................................72
Saturation .....................................................................72
Pulse rates ...................................................................72
Sensor Performance Considerations ....................................72
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Contents
Operator’s Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77
Error Codes ...........................................................................77
Corrective Action ...................................................................78
EMI (Electro-magnetic Interference) ..................................... 81
Obtaining Technical Assistance ............................................82
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .85
Returning the N-550 ..............................................................85
Service .................................................................................. 85
Periodic Safety Checks .........................................................86
Cleaning ................................................................................ 86
Technical Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .87
Description of Alarms ............................................................87
Factory Defaults ....................................................................88
SatSeconds Display ..............................................................89
Describing SatSeconds .........................................................90
SatSeconds “Safety Net” ......................................................92
Principles of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93
Oximetry Overview ................................................................93
Automatic Calibration ............................................................94
Functional versus Fractional Saturation ................................95
Measured versus Calculated Saturation ............................... 95
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .97
Performance .........................................................................97
Electrical .............................................................................101
Environmental Conditions ...................................................102
Physical Characteristics ......................................................104
Compliance ......................................................................... 105
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .109
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Figures
Contents
Figure 1: Front Panel Buttons and Symbols .........................7
Figure 2: Rear Panel Symbols ..............................................8
Figure 3: Data Port Pin Layout ...........................................49
Figure 4: Real-Time Data Printout ......................................59
Figure 5: Trend Data Printout .............................................60
Figure 6: Alarm Response with SatSeconds ......................91
Figure 7: Oxyhemoglobin Dissociation Curve ....................96
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Contents
Tables
Table 1: Data Port Pinouts .................................................. 48
Table 2: Nellcor Oximetry Sensor Models
and Patient Weights .........................................66
Table 3: Operator’s Menu ...................................................75
Table 4: Error Codes ...........................................................78
Table 5: Factory Default Settings ........................................88
Table 6: Tone Definition ......................................................98
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Safety Information
Warnings
Warnings are identified by the WARNING symbol shown above.
W arnings alert the user to potential serious outcomes (death, injury, or
adverse events) to the patient or user.
WARNING: Explosion hazard. Do not use the N-550 pulse
oximeter in the presence of flammable anesthetics or gases.
WARNING: Pulse oximetry readings and pulse signals can be
affected by certain ambient environmental conditions, sensor
application errors, and certain patient conditions. See the
appropriate sections of the manual for specific safety
information.
WARNING: Ensure that the speaker is clear of any obstruction.
Failure to do so could result in an inaudible alarm tone.
N-550 1
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Safety Information
Cautions
Cautions are identified by the CAUTION symbol shown above.
Cautions alert the user to exercise care necessary for the safe and
effective use of the N-550.
CAUTION: When connecting the N-550 to any instrument,
verify proper operation before clinical use. Both the N-550 and
the instrument connected to it must be connected to a grounded
outlet. Accessory equipment connected to the N-550's data
interface must be certified according to IEC Standard 60950 for
data-processing equipment or IEC Standard 60601-1 for
electromedical equipment. All combinations of equipment must
be in compliance with IEC Standard 60601-1-1 systems
requirements. Anyone who connects additional equipment to the
signal input port or signal output port (N-550 data port
connector) configures a medical system and is therefore
responsible for ensuring that the system complies with the
requirements of system standard IEC Standard 60601-1-1 and
the electromagnetic compatibility system standard IEC Standard
60601-1-2. The N-550 accuracy may degrade if it is connected to
secondary I/O devices when the instrument is not connected to
earth reference.
CAUTION: Do not lift the N-550 by the sensor cable or power
cord because the cable or cord could disconnect from the N-550,
causing damage to the N-550 or injuring the patient.
CAUTION: Federal law (U.S.A.) restricts this device to sale by or
on the order of a physician.
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Notes
Safety Information
Notes are identified by the Note symbol shown above.
Notes provide additional useful information.
N-550 3
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Introduction
WARNING: The N-550 is intended only as an adjunct in patient
assessment. It must be used in conjunction with clinical signs and
symptoms. Do not make any clinical judgments based on the
oximeter's measurements only.
Intended Use for the N-550
The N-550 Pulse Oximeter is indicated for the continuous
noninvasive monitoring of functional oxygen saturation of arterial
hemoglobin (SpO
with neonatal, pediatric, and adult patients during both no-motion and
motion conditions and for patients who are well or poorly perfused, in
hospitals, hospital-type facilities, intra-hospital transport, and home
environments. For prescription use only.
2) and pulse rate. The N-550 is intended for use
Note: Hospital use typically covers such areas as general care floors,
operating rooms, special procedure areas, intensive and critical
care areas, within the hospital plus hospital-type facilities.
Hospital-type facilities include physician office-based
facilities, sleep labs, skilled nursing facilities, surgicenters, and
sub-acute centers.
Intra-hospital transport includes transport of a patient within
the hospital or hospital-type facility .
Use with any particular patient requires the selection of an
appropriate oxygen transducer (sensor) as described in this Operator's
Manual.
Motion performance claims are applicable to models MAX-A,
MAX-AL, MAX-P, MAX-N, and MAX-I Nellcor O
XIMAX
TM
oximetry sensors.
N-550 5
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Description of Controls, Indicators, and Symbols
Identification of Front Panel Buttons and Symbols
Figure 1: Front Panel Buttons and Symbols
1 — SpO
2 Sensor Port 12 — SatSeconds Alarm Limit
Button
2 — Power On/Off Button 13 — SpO
3 — %SpO
4 — Pulse Amplitude
2 Display 14 — Motion Indicator
15 — Sensor Off Indicator
2 Alarm Limit Button
Indicator
5 — Pulse Rate Display 16 — Sensor Message Indicator
6 — Alarm Silence Button 17 — Pulse Search Indicator
7 — Alarm Silence Indicator 18 — Data In Sensor Indicator
8 — Adjust Up Button 19 — Low Battery Indicator
9 — Adjust Down Button 20 — AC Power Indicator
10 — Pulse Rate Alarm Limit
21 — Speaker
Button
11 — SatSeconds
N-550 7
TM
Display
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Description of Controls, Indicators, and Symbols
Identification of Rear Panel Components
1 — Data Port Connector 3 — AC Power Connector
N-550 Symbols
2 — Foot Switch and Visual
Alarm Connector
Figure 2: Rear Panel Symbols
The symbols that are located on the rear panel of the N-550 are as
follows:
1 — Data Interface 3 — Foot Switch
2 — Caution - Do not connect
while power is on
4 — Equipotential Connector
(ground)
4 — Equipotential Terminal
(ground)
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Description of Controls, Indicators, and Symbols
The symbols that are located on the front panel of the N-550 are as
follows:
1 — T ype BF Applied Part -
Not Defibrillator Proof
2 — Pulse Rate 7 — Data In Sensor
3 — Motion 8 — Low Battery
4 — Sensor Off 9 — AC Power/Battery Charge
5 — Sensor Message
Description of Controls
Note: Each button press, except the Power On/Off button, should
result in either a valid or an invalid button tone. If the button
pressed fails to emit a tone, contact qualified service personnel.
6 — Pulse Search
The Power On/Off button is used to turn the N-550 on or off.
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Description of Controls, Indicators, and Symbols
The Alarm Silence button is used to silence current alarms for the
alarm silence duration period. When an alarm has been silenced,
pressing the button again reactivates, or “unsilences” the alarm. It is
also used to view and adjust alarm silence duration and alarm volume.
The Adjust Up button is used to increase alarm limit values, alarm
silence duration, pulse beep volume, alarm volume, and data port
baud rate. The Adjust Up button is used to select the communication
protocol and time settings. Press the Adjust Up button one time to
increase the display by one digit. Holding the Adjust Up button down
for more than one second cause the display digits to scroll.
The Adjust Down button is used to decrease alarm limit values, alarm
silence duration, pulse beep volume, alarm volume, and data port
baud rate. The Adjust Down button is used to select the
communication protocol and time settings. Press the Adjust Down
button one time to decrease the display by one digit. Holding the
Adjust Down button down for more than one second cause the
display digits to scroll.
The SpO
When the SpO
2 Alarm Limit button is used to view the SpO2 alarm limit.
2 Alarm Limit button is pressed at the same time as the
Pulse Rate Alarm Limit button for approximately three seconds, the
menu options are enabled.
The Pulse Rate Alarm Limit button is used to view the pulse rate
alarm limit. When the Pulse Rate Alarm Limit button is pressed at the
same time as the SpO
2 Alarm Limit button for approximately three
seconds, the menu options are enabled.
The SatSeconds Alarm Limit button is used to view the SatSeconds
alarm limit. When pressed, the menu options are enabled. The Adjust
Up and Adjust Down buttons are used to change the SatSeconds limit
settings.
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Description of Controls, Indicators, and Symbols
Description of Displays and Indicators
The Pulse Amplitude Indicator (blip bar). A 10-segment LED that
indicates pulse beat and shows the relative pulse amplitude. As the
detected pulse becomes stronger, more bars light with each pulse.
The %SpO
2 Display. Shows the saturation level of oxygenated
hemoglobin. The display value flashes zero during loss-of-pulse
alarms and flashes the SpO
2 value when the SpO2 is outside the alarm
limits. During pulse search, the N-550 continues to update the
display. If alarm limits have been changed from their power-on
defaults, a decimal point (.) is displayed after the SpO
2 value (100.).
The Pulse Rate Display . Shows the pulse rate in beats per minute. It
flashes zeros during loss-of-pulse alarms and flashes the beats per
minute value in red when the pulse rate is outside of the alarm limit.
During pulse search, the N-550 continues to update the display. Pulse
rates outside of the pulse rate range (20 to 250 bpm) are displayed as
the closest value within the range. If alarm limits have been changed
from their power-on defaults, a decimal point (.) is displayed after the
pulse rate value (112.).
The AC Power Indicator. Lights continuously when the N-550 is
connected to AC power. It also indicates that the battery is charging.
It is off when the N-550 is being powered by its internal battery.
The Low Battery Indicator. Lights cont inuously to indicate that 15 or
fewer minutes of battery capacity remain. The Low Battery indicator
flashes when the battery is critically low.
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Description of Controls, Indicators, and Symbols
The Alarm Silence Indicator. Lights continuously when an audible
alarm has been silenced. It flashes when the alarm silence duration
has been set to OFF.
The Motion Indicator. Lights continuously whenever the O
algorithm detects the presence of artifact independent of its severity
or the impact on the SpO
indicator and the pulse search indicator are simultaneously lit, it is an
indication that the artifact is significant and/or has been persistent.
The Pulse Search Indicator. Lights continuously prior to initial
acquisition of a pulse signal and during prolonged and challenging
monitoring conditions. It flashes during a loss-of-pulse signal.
The Sensor Off Indicator is lit when either the sensor is invalid, or no
longer on the patient’ s finger. It usually indicates that the sensor is not
on the patient.
The Sensor Message Indicator. Lights when the N-550 cannot
determine an SpO
2 level or a pulse rate. The Sensor Message
recommendations for improving the signal are:
®
XIMAX
2 or pulse rate values. Whenever the motion
12
• Reposition sensor
• Check or change adhesive wrap
• Choose alternate site
• Warm site
• Cover sensor
• Use forehead, nasal, or ear sensor (adult patients only)
•Use O
XIMAX adhesive sensor
• Secure cable
• Secure with headband (M
AX-FAST)
• Remove nail polish
• Loosen sensor (too tight)
• Isolate external interference (electrosurgical device, cell
phone)
• Clean site (MAX-R)
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Description of Controls, Indicators, and Symbols
The Data In Sensor Indicator. The indicator blinks for approximately
one minute when initially connected to the N-550 to indicate that the
attached O
XIMAX sensor contains a patient sensor event record. The
indicator lights continuously to indicate that the attached sensor
memory is full. The indicator does not light when there is no data in
the sensor, ev en though a valid sensor is connected to the N-550.
TM
The SatSeconds
Indicator. Fills in clockwise as the SatSeconds
alarm management approaches the SatSeconds alarm limit threshold.
All segments of the SatSeconds indicator flash during a SatSeconds
alarm. When a SatSeconds setting other than OFF is selected, the
green LED at the top of the SatSeconds indicator will light. The green
LED at the 12-o'clock position indicates that SatSeconds alarm
management is engaged.
Description of Audible Indicators
Following are descriptions of N-550 audible indicators.
Power-On Self-Test
Pass
A 1-second tone indicating that the N-550
has been turned on and has successfully
completed the power-on self-test
Valid Button Press A short, medium-pitched tone indicating
that an appropriate button has been
pressed
Invalid Button Press A short, low-pitched tone indicating that a
button has been pressed that is not
appropriate for the current state of the
N-550
High Priority Alarm A high-pitched, fast-pulsating tone
indicating loss of pulse with no patient
motion
Medium Priority
Alarm
A medium-pitched, normal-pulsating tone
indicating an SpO
2 or pulse rate limit
violation
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Description of Controls, Indicators, and Symbols
Low Priority Alarm A low-pitched, slow-pulsating tone
indicating a sensor disconnect, low
battery, or N-550 failure
Alarm Silence
Reminder
Three beeps that sound approximately
every 3 minutes when alarms are silenced
with the alarm silence duration set to OFF
Pulse Beep A single beep sounds for each detected
pulse. The pitch changes as monitored
2 values increase or decrease.
SpO
Volume Setting Tone A continuous tone that is used to adjust
the alarm volume
Confirmation T o ne Three beeps sound to indicate that default
settings have been saved or reset to
factory defaults or trend data has been
deleted
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Setting up the N-550
WARNING: Explosion hazard. Do not use the N-550 pulse
oximeter in the presence of flammable anesthetics or gases.
WARNING: Pulse oximetry readings and pulse signals can be
affected by certain ambient environmental conditions, sensor
application errors, and certain patient conditions. See the
appropriate sections of the manual for specific safety
information.
WARNING: To ensure patient safety, do not place the N-550 in
any position that might cause it to fall on the patient.
WARNING: As with all medical equipment, carefully route
patient cabling to reduce the possibility of patient entanglement
or strangulation.
WARNING: Disconnect the N-550 and Nellcor sensor from the
patient during magnetic resonance imaging (MRI) scanning.
Induced current could potentially cause burns. The N-550 may
affect the MRI image; the MRI unit may affect the accuracy of
oximeter measurements.
WARNING: To ensure accurate performance and prevent device
failure, do not subject the N-550 to extreme moisture, such as
direct exposure to rain. Such exposure may cause inaccurate
performance or device failure.
N-550 15
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Setting up the N-550
WARNING: Do not use an N-550, sensor, cables, or connectors
that appear to be damaged.
WARNING: The N-550 is not defibrillator-proof. However, it
may remain attached to the patient during defibrillation or while
an electrosurgical unit is in use, but the readings may be
inaccurate during use and shortly thereafter.
WARNING: In the USA, do not connect the N-550 to an electrical
outlet controlled by a wall switch because the N-550 may be
accidentally turned off.
WARNING: Use only the DOC-10 pulse oximetry cable with the
N-550. Use of another sensor cable will have an adverse effect on
performance. Do not attach any cable that is intended for
computer use to the sensor port. Do not connect any device other
than a Nellcor-approved sensor to the sensor connector.
List of Components
1 — N-550 Pulse Oximeter
1 — Nellcor Sensor or Assortment Pack
1 — DOC-10 Pulse Oximeter Cable
1 — N-550 Operator's Manual
1 — Hospital-Grade Power Cord or power cord appropriate for
1 — Sensor Accuracy Grid
1 — Quick Guide
16
country of sale
Page 25
Connecting the N-550 to AC Power
1 — Power Connector
1. Plug the female connector of the power cord into the N-550 AC
power connector (1).
2. Plug the male connector of the power cord into a properly
grounded AC outlet.
Setting up the N-550
3. Verify that the AC POWER INDICATOR is lit.
Connecting a Sensor to the N-550
WARNING: Use only the DOC-10 pulse oximetry cable with the
N-550. Use of another sensor cable will have an adverse effect on
performance. Do not attach any cable that is intended for
computer use to the sensor port. Do not connect any device other
than a Nellcor-approved sensor to the sensor connector.
N-550 17
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Setting up the N-550
.
1 — SpO2 Sensor Port
1. Connect a DOC-10 pulse oximetry cable to the SpO2 Sensor Port
(1) on the front of the N-550.
2. Connect an SpO
2 Sensor to the other end of the DOC-10 pulse
oximetry cable. Plug the sensor connector firmly into the
DOC-10 pulse oximetry cable.
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Battery Operation
WARNING: Dispose of an old battery by following local
guidelines for disposal of lead acid batteries.
Operating the N-550 on Battery Power
The N-550 has an internal battery that may be used to power the
N-550 during transport or when AC power is not available. A new,
fully charged battery will provide at least 1.5 to 2 hours of monitoring
time under the following conditions: no audible alarms sound and no
serial output devices are attached.
Note: Whenever the N-550 is connected to AC power, the battery is
being charged. Therefore, it is recommended that the N-550
remain connected to AC power when not in use. This will
make a fully charged battery availabl e for use at any t ime .
The N-550 cannot operate with a dead battery (even when plugged
in). Before attempting to turn on an N-550 with a depleted battery,
first plug the N-550 into an AC outlet to allow the battery to charge
for a few minutes. The N-550 may then be powered on.
To charge a low or dead battery, connect the N-550 to AC power. A
full charge of a dead battery takes 11 hours while the N-550 is turned
off or 12 hours while the N-550 is on.
When all of the following conditions are present for 15 minutes, the
N-550 will automatically shut down:
• N-550 is running on battery power
• No buttons have been pressed
• No pulse has been detected (for example, when no patient is
connected to the sensor or the sensor is disconnected)
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Battery Operation
• No alarms are present (other than low battery or a
Low Battery Indicator
The Low Battery Indicator lights and a low priority alarm begins to
sound when 15 minutes but not more than 20 minutes of monitoring
time remain on the existing battery charge. This alarm cannot be
silenced while running on battery power. Connecting the N-550 to
AC power will silence the alarm. If the N-550 is not connected to AC
power within approximately 15 minutes, the N-550 will shut off.
Note: As the battery is used and recharged over a period of time, the
It is recommended that qualified service personnel replace the
internal battery every 24 months.
non-correctable error)
amount of time between the onset of the low battery alarm and
the N-550 shut-off may become shorter.
20
CAUTION: If the N-550 is to be stored for 2 months or longer,
notify service personnel to remove the battery from the N-550
prior to storage. Recharge the battery when it has not been
charged for 2 or more months.
The Low Battery Indicator flashes and a high priority alarm begins to
sound when the battery reaches the lowest battery voltage at which an
N-550 can support normal operation. This alarm cannot be silenced
while running on battery power. If the N-550 is not connected to AC
power, the N-550 will shut off after 10 seconds.
Page 29
Using the N-550
Turning on the N-550
Discussion
Before using the N-550 in a clinical setting, you must verify that the
N-550 is working properly and is safe to use. Proper working
condition can be verified by successful completion of the Power-On
Self-Test (POST), described in the following section.
WARNING: The N-550 should not be used adjacent to or stacked
with other equipment. If adjacent or stacked use is necessary, the
N-550 should be observed to verify normal operation in the
configuration in which it is used.
CAUTION: If any indicator or display element does not light, or
the speaker does not sound, do not use the N-550. Instead, contact
qualified service personnel, your local Nellcor representative, or
Nellcor's Technical Services Department, 1.800.635.5267.
Note: The N-550 should complete the POST function within 12
seconds.
Procedure
1. Turn on the N-550 by pressing and holding the Power On/Off
button for more than one second.
N-550 21
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Using the N-550
2. The N-550 displays/sounds:
Display Sound
5 (in pulse rate left window) one beep tone
5 (in pulse rate center window) one beep tone
0 (in pulse rate right window) one beep tone
n (in SpO
n (in SpO
2 left window) none
2 center window) none
3. The N-550 automatically starts the Power-On Self-Test (POST),
which tests N-550 circuitry and functions.
CAUTION: During POST (immediately after power-up), confirm
that all display segments and indicators light, and the speaker
sounds a 1-second pass tone.
22
4. While performing POST, the self-test display appears for
approximately 2 to 4 seconds. During this time:
• All indicators illuminate
• All segments of all numeric digits light and change from red
to green
Page 31
Using the N-550
• All segments of the Pulse Amplitude Display light
• All segments of the SatSeconds indicator light
5. Once the display test portion of POST is complete, the N-550
software version is displayed for approximately 2 seconds.
Note: The device version illustrated is only a sample. The device
version identifies the hardware configuration and the software
revision.
Device version numbers are often needed when calling
Nellcor's Technical Services Department, 1.800.635.5267, or
your local Nellcor representative for technical assistance. Write
down the numbers and have them available prior to requesting
technical assistance.
6. If the N-550 detects an internal problem during the self-test, an
alarm tone sounds and the N-550 displays an Error Code and the
corresponding number. See Troubleshooting on page 77.
N-550 23
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Using the N-550
7. Upon successful completion of the POST, the N-550 sounds a
one-second tone indicating that the N-550 has passed the test.
WARNING: If you do not hear the POST pass tone, do not use
the N-550.
WARNING: Ensure that the speaker is clear of any obstruction.
Failure to do so could result in an inaudible alarm tone.
Sensor Attached
24
Note: In addition to serving as the POST pass verification, the POST
pass tone also functions as an audible confirmation that the
speaker is performing properly. If the speaker does not
function, the alarm sounds cannot be heard.
The Pulse Search indicator and the Sensor Off indicator light and the
N-550 displays dashes in the %SpO
2 and Pulse Rate displays while
the N-550 is searching for a valid pulse.
Page 33
Using the N-550
1 —Sensor Off 2 — Pulse Search Indicator
When a valid pulse is detected, the N-550 enters the Monitoring
Mode and displays patient parameters. Look for movement of the blip
bar and, if the pulse beep volume is not 0, listen for pulse beeps to
verify that displayed measurement values are current and accurate.
When a sensor is connected to the N-550 and is not connected to a
patient, the display reads dashes and the N-550 remains in the Pulse
Search mode.
N-550 25
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Using the N-550
No Sensor Attached
Sensor Message
When the sensor is not attached the N-550 displays dashes (---) and
the Pulse Search indicator is not lit, indicating that the N-550 failed to
detect a sensor.
The Sensor Message feature is an indication that the sensor position
or site needs to be considered. The Sensor Message indicator lights
when the N-550 cannot determine an SpO
2 level or a pulse rate. The
Sensor Message recommendations for improving the signal are:
26
• Reposition sensor
• Check or change adhesive wrap
• Choose alternate site
• Warm site
• Cover sensor
• Use forehead, nasal, or ear sensor (adult patients only)
•Use O
XIMAX adhesive sensor
• Secure cable
• Secure with headband (M
AX-FAST)
• Remove nail polish
• Loosen sensor (too tight)
Page 35
• Isolate external interference (electrosurgical device, cell
phone)
• Clean site (MAX-R)
Setting the Pulse Beep Volume
Using the N-550
1 — SpO2 Sensor Port
WARNING: Use only Nellcor- approved sensors and sensor
cables.
1. Connect a DOC-10 pulse oximetry cable to the SpO
2 Sensor Port
(1) on the front of the N-550.
2. Connect an SpO
2 Sensor to the other end of the DOC-10 pulse
oximetry cable.
3. Place the SpO
2 Sensor on the patient or yourself.
4. Turn on the N-550.
5. Press and hold the Adjust Up or Adjust Down button to increase
or decrease the pulse beep tone volume.
N-550 27
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Using the N-550
Setting the Alarm Volume
With the N-550 in the normal monitoring mode:
1. Press and hold the Alarm Silence button until the alarm volume
display appears.
2. While continuing to press the Alarm Silence button, press the
Adjust Up button or Adjust Down button to increase or decrease
the alarm volume.
Setting Alarm Silence Duration
Discussion
WARNING: Do not silence an audible alarm or decrease its
volume if patient safety could be compromised.
Alarms can be silenced for a preset period called alarm silence
duration. To view the current setting, press and hold the Alarm
Silence button until 30 SEC, 60 SEC, 120 SEC, or OFF is displayed.
To adjust the settings, press and hold the Alarm Silence button until
30 SEC, 60 SEC, 120 SEC, or OFF is displayed. Continue holding the
28
Page 37
Using the N-550
Alarm Silence button, and use the Adjust Up button or Adjust Down
button to increase or decrease the value. Possible values are 30, 60,
90, or 120 seconds, or OFF. The OFF selection is discussed under
Disabling Audible Alarms on page 30.
If the Alarm Silence button is pressed during the alarm silence
duration, the alarm silence duration is ended and the audible alarms
are re-enabled.
Visual indications of an alarm condition cannot be turned off. For
example, if the %SpO
be silenced for the alarm silence duration, but the %SpO
2 lower alarm limit is exceeded, the alarm can
2 value will
continue to flash.
If the alarm condition is still present when the alarm silence duration
has elapsed, the alarm will sound.
The power-on default setting for audible alarm silence duration is set
at the factory to 60 seconds. The default setting can be adjusted by
service personnel as described in the N-550 service manual.
Procedure
With the N-550 in the normal monitoring mode:
1. Press the Alarm Silence button until XX SEC is displayed.
Durations are: OFF, 30, 60, 90, and 120 seconds.
Note: For steps 2 and 3, the Adjust Up and Adjust Down buttons
must be pressed while pressing the Alarm Silence button.
N-550 29
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Using the N-550
2. While pressing the Alarm Silence button, press and hold the
Adjust Up button to increase alarm silence duration to Off, 30,
60, 90, or 120 seconds.
3. While pressing the Alarm Silence button, press and hold the
Adjust Down button to decrease alarm silence duration to OFF,
30, 60, 90, or 120 seconds.
Note: Releasing the Adjust Up or Adjust Down button sets the alarm
silence duration.
Disabling Audible Alarms
Discussion
Setting the alarm silence duration to OFF means that the N-550 will
produce no audible alarms.
Procedure
30
V isual indications of an alarm condition are not affected by disabling
the audible alarms.
The ability to set the alarm silence duration to OFF can be enabled or
disabled by qualified service personnel as described in the service
manual.
WARNING: Do not silence the audible alarm or decrease its
volume if patient safety could be compromised.
With the N-550 in the normal monitoring mode:
Page 39
Using the N-550
1. Press the Alarm Silence button until XX SEC is displayed.
2. While pressing the Alarm Silence button, press and hold the
Adjust Up button until OFF is displayed. Release buttons.
3. The Alarm Silence indicator will flash, indicating that the alarm
sounds are disabled. The N-550 will sound three beeps
approximately every three minutes to warn the user that the alarm
sound has been silenced.
Verify Patient Settings
With the N-550 in the normal monitoring mode:
1. Press the SpO
upper alarm limit.
N-550 31
2 Alarm Limit button to view the current %SpO2
Page 40
Using the N-550
2. Press the SpO2 Alarm Limit button twice to view the current
%SpO
2 lower alarm limit.
32
3. Press the Pulse Rate Alarm Limit button to view the current Pulse
Rate upper alarm limit.
4. Press the Pulse Rate Alarm Limit button twice to view the current
Pulse Rate lower alarm limit.
Page 41
Using the N-550
5. Press the SatSeconds Alarm Limit button to view the current
SatSeconds setting.
Note: The SatSeconds (12 O’clock) indicator lights, indicating that
SatSeconds units are being reviewed. The SatSeconds (12
O’clock) indicator lights for all SatSeconds except Off.
Alarm Limits Changed Indicator
If an alarm limit is changed from the N-550’s power-on default
setting, a decimal point appears after the applicable displayed value,
during patient monitoring and when alarm limits are viewed. The
decimal point remains on the display until the N-550 is turned off or
the limit is returned to the default value.
N-550 33
Page 42
Using the N-550
Alarm limits that have been changed from the default setting are
identified by a decimal point (.) after the displayed reading (%SpO
or Pulse Rate).
Setting Alarm Limits
Discussion
Alarm limits determine the upper and lower points of patient data at
which the N-550 will sound an alarm.
Procedure
With the N-550 in the normal monitoring mode:
2
1. Press SpO
2 Alarm Limit button to view the current %SpO2 upper
alarm limit.
2. Press the Adjust Up button or Adjust Down button to increase or
decrease the alarm limit setting.
Note: When an alarm limit is changed from power-on default, the
N-550 displays a decimal point (.) after the changed parameter.
34
Page 43
Using the N-550
3. Press the SpO2 Alarm Limit button twice to view the current
%SpO
2 lower alarm limit.
4. Press the Adjust Up button or Adjust Down button to increase or
decrease the alarm limit setting.
5. Press the Pulse Rate Alarm Limit button to view the current upper
alarm limit for Pulse Rate.
6. Press the Adjust Up button or Adjust Down button to increase or
decrease the alarm limit setting.
N-550 35
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Using the N-550
7. Press the Pulse Rate Alarm Limit button twice to view the current
lower alarm limit for Pulse Rate.
8. Press Adjust Up button or Adjust Down button to increase or
decrease the alarm limit setting.
Setting SatSeconds Duration
Discussion
Procedure
36
Refer to Describing SatSeconds on page 90 for a description of the
SatSeconds function.
With the N-550 in the normal monitoring mode:
1. Press the SatSeconds Alarm Limit button. The current SatSeconds
setting is displayed.
Page 45
Note: The possible settings for SatSeconds are Off, 10, 25, 50, and
100 seconds.
2. Press the Adjust Up button or Adjust Down button to select the
desired SatSeconds setting.
Setting the Data Port Baud Rate
Using the N-550
Discussion
Procedure
The baud rate determines the speed at which the N-550 sends data to
the attached equipment (printer or portable computer). The baud rate
is determined by the capabilities of the attached equipment.
With the N-550 in the normal monitoring mode:
1. Simultaneously, press the SpO
Rate Alarm Limit button for 3 seconds. Menu option 1 will be
displayed.
2 Alarm Limit button and Pulse
N-550 37
Page 46
Using the N-550
2. Press the Adjust Up button until menu item option 4 is displayed.
3. Press the SatSeconds Alarm Limit button. Current baud rate is
displayed.
Press the Adjust Up button or Adjust Down button to select the
desired baud rate. Possible settings are:
• 24 (2,400 bps)
• 96 (9,600 bps)
• 192 default (19,200 bps).
38
Page 47
Setting the Data Port Protocol
With the N-550 in the normal monitoring mode:
Using the N-550
1. Simultaneously, press the SpO
2 Alarm Limit button and Pulse
Rate Alarm Limit button for 3 seconds. Menu option 1 will be
displayed.
2. Press the Adjust Up button until menu item option 5 is displayed.
3. Press the SatSeconds Alarm Limit button. Current protocol is
displayed.
N-550 39
Page 48
Using the N-550
4. Press the Adjust Up button or Adjust Down button to select the
desired protocol. Possible settings are:
•1 - ASCII
• 2 - External equipment communications. Refer to the external
equipment manuals for the interfacing instructions.
Clearing Trend Information
40
With the N-550 in the normal monitoring mode:
1. Simultaneously press and hold the SpO
2 Alarm Limit button and
Pulse Rate Alarm Limit button for at least 3 seconds. Option 1
will be displayed.
2. Press the Adjust Up button to select Option 2.
Page 49
Using the N-550
3. Press the SatSeconds Alarm Limit button to clear the trend data.
4. The N-550 emits 3 beeps, indicating that data is cleared.
N-550 41
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Blank Page
Page 51
N-550 Trend
Trend Data Operation
From the initial measurement of a patient, trend data (a data point) is
stored in memory every 4 seconds. Up to 50 alarm limit changes can
also be stored in trend data. The N-550 can store up to 24 hours of
trend data.
The N-550 trend data will be lost if the coin cell battery fails or is
removed. The coin cell battery is located on the main circuit board.
CAUTION: Changing alarm limit settings uses trend memory
space. Change alarm limits only as needed.
Note: Trend memory always contains the most recent 24 hours of
data, with newly collected data overwriting the oldest data on a
rolling basis. The N-550 continues to record data points as long
as the N-550 is powered on and an initial patient measurement
has been made, with “blank” data points collected if no sensor
is connected to the N-550 or patient. “Blank” data will
overwrite older patient data if the memory becomes full.
Therefore, if you want to save old patient data, it is important
that you turn your N-550 off when you are not monitoring a
patient, and that you download the trend memory before it fills
up and overwrites the old data with new data (or “blank” data).
Trend Data
Trend data information may be retrieved or cleared through the N-550
data port using options available in a display menu.
N-550 43
Page 52
N-550 Trend
#1: Trend Print
To access the menu options, simultaneously press the SpO2 Alarm
Limit and Pulse Rate Alarm Limit buttons until Option 1 appears on
the display .
Then, using the Adjust Up button and Adjust Down button, you may
scroll through the available menu options as follows:
Allows printing of the existing trend data. The output may be viewed
on a PC using the Hyper Terminal program. You must press the
SatSeconds Alarm Limit button to initiate printing. Refer to Trend
Data Printout on page 59.
#2: Trend Clear
#3: Not Used
#4: Baud Rate
44
Clears the existing trend data. To activate, press the SatSeconds
Alarm Limit button.
Allows the interconnection to various printers. Refer to Setting the
Data Port Baud Rate on page 37. The baud rate selections are:
• 24 (2,400 baud rate)
Page 53
#5: Data Port Printout
Selections are as follows:
Option 1
Printout in ASCII characters.
Option 2
External equipment communications. Refer to the external equipment
manual for the interfacing instructions.
N-550 Trend
• 96 (9,600 baud rate)
• 192 default (19,200 baud rate)
N-550 45
Page 54
Blank Page
Page 55
Using the Data Port
Overview
Patient data can be obtained through the data port on the back of the
N-550 by connecting it to an attached PC or serial printer.
When connecting the N-550 to a printer or PC, verify proper
operation before clinical use. Both the N-550 and the printer or PC
must be connected to a grounded AC outlet. The N-550 protocol
setting must be ASCII.
Any printer or PC connected to the N-550's data port must be certified
according to IEC Standard 60950. All combinations of equipment
must be in compliance with IEC Standard 60601-1-1 systems
requirements. Anyone who connects a printer or PC to the data output
port configures a medical system and is therefore responsible for
ensuring that the system complies with the requirements of system
standard IEC Standard 60601-1-1 and the electromagnetic
compatibility system standard IEC Standard 60601-1-2.
Connecting to the Data Port
The N-550 data port may be connected to the printer or PC by using a
cable terminated with an AMP connector (AMP part number
747538-1), ferrule (AMP part number 1-747579-2), and compatible
pins (AMP part number 66570-2). The cable should be no more than
25 feet (7.6 meters) in length. The external ITE (Information
Technology Equipment) device must be certified to UL-1950 or
IEC-60950.
N-550 47
Page 56
Using the Data Port
The cable used must have a braided shield providing 100% coverage,
such as a Belden cable (Belden part number 9609) or equivalent. The
shield must have a 360-degree connection to the metal shell on the
N-550's DB-15 connector and to the connector on the PC or serial
printer. Do not create sharp bends in the cable, as this may tear or
break the shielding.
No hardware flow control is used. However, in the ASCII mode,
XON/XOFF flow control is supported.
Data Port Pinouts
TXD represents the Transmit Data line, and RXD is the Receive Data
line.
The pinouts for the data port are listed in Table 1.
Table 1: Data Port Pinouts
Pin Signal Name
1 RXD+ (RS-422 positive input)
2 RXD (RS-232 input)
3 TXD (RS-232 output)
4 TXD+ (RS-422 positive output))
5 Signal Ground (isolated from Earth Ground)
6 NC (No connection)
7 Normally Open (relay closure nurse call, normally open)
8 Normally Closed (relay closure nurse call, normally
closed)
9 RXD- (RS-422 negative output)
10 Signal Ground (isolated from earth ground)
11 Nurse Call (RS-232 level output)
48
Page 57
Using the Data Port
Table 1: Data Port Pinouts
Pin Signal Name
12 TXD- (RS-422 negative output)
13 NC
14 NC
15 Nurse Call Common
The pin layouts (as viewed from the rear panel of the N-550) are
illustrated in Figure 3. The conductive shell is connected to earth
ground when connected to a PC or printer.
Figure 3: Data Port Pin Layout
Pins 2, 3, 5, and 11 provide data in RS-232 format.
Pins 1, 4, 9, and 12 provide data in RS-422 format. TXD+ and TXDare the differential transmit data pair. RXD+ and RXD- are the
differential receive pair.
Data Port Setup
Discussion
Use the Data Port Setup procedure to configure the N-550 data port
baud rate and protocol.
N-550 49
Page 58
Using the Data Port
Procedure
With the N-550 in the normal operating mode:
1. Simultaneously press and hold the SpO
2 Alarm Limit button and
Pulse Rate Alarm Limit button for at least 3 seconds. Option 1
will be displayed.
2. Press the Adjust Up button until Option 4 is displayed.
50
3. Press the SatSeconds Alarm Limit Button to select Option 4. The
selected baud rate will be displayed.
Page 59
Using the Data Port
Note: The available selections are:
• 24 = 2400 baud rate
• 96 = 9600 baud rate
• 192 = 19200 baud rate
4. Press the Adjust Up button or the Adjust Down button to select
the desired baud rate.
5. Press the SatSeconds Alarm Limit button to save the desired baud
rate.
6. Simultaneously press and hold the SpO
2 Alarm Limit button and
Pulse Rate Alarm Limit button for at least 3 seconds. Option 1
will be displayed.
N-550 51
Page 60
Using the Data Port
7. Press the Adjust Up button until Option 5 is displayed.
8. Press the SatSeconds Alarm Limit Button to select Option 5. The
selected protocol will be displayed.
Note: The available selections are:
• 1 = Real time ASCII
• 2 = External equipment communications. Refer to the
external equipment manuals for the interfacing instructions.
52
Page 61
9. Press the Adjust Up button or the Adjust Down button to display
10. Press the SatSeconds Alarm Limit button to save the desired
Nurse Call Interface
Using the Data Port
the desired protocol.
protocol.
WARNING: The nurse call feature should not be used as the
primary source of alarm notification. The audible and visual
alarms of the pulse oximeter, used in conjunction with clinical
signs and symptoms, are the primary sources for notifying
medical personnel that an alarm condition exists.
WARNING: The nurse call feature is not functional whenever the
pulse oximeter alarms are silenced.
Caution: The nurse call function needs to be tested after it has
been set up in your facility. The nurse call feature should be
tested whenever setting up the N-550 pulse oximeter in a location
that uses nurse call. If an attached O
XIMAX sensor is disconnected
from the patient, the N-550 remains in the Pulse Search Mode for
awhile, then the N-550 displays “--- “ (3 dashes) in the %SpO
2
and pulse rate display. One way to test the nurse call function is to
create an alarm condition (for example, sensor disconnect) and
verify that your facility's nurse call system is activated.
N-550 53
Page 62
Using the Data Port
The nurse call feature of the N-550 is operational when the N-550 is
powered by AC power or battery power. The nurse call feature of the
N-550 works in conjunction with the nurse call system of your
institution when the N-550 sounds an audible alarm.
The N-550 provides two different types of nurse call interfaces: an
RS-232 format and relay closure. Both interfaces function when the
N-550 is operating either on AC power or battery power.
The remote location is signaled anytime there is an audible alarm. If
the audible alarm has been turned off or silenced, the nurse call
function is also turned off.
Pin 11 on the data port is the RS-232 lev el nurse call signal and pin 5
or 10 is ground (see Table 1 on page 48). When there is no alarm
condition, the voltage between pins 10 and 11 is -5 to -12 VDC.
Whenever the N-550 is in an alarm condition, the output between pins
10 and 11 is +5 to +12 VDC. This is the default condition (normally
low). There is a service menu to change the default condition. Refer
to the N-550 service manual for the procedure.
Pins 7 and 15 provide a relay that closes when an alarm is sounding
on the N-550. Pins 8 and 15 provide a relay that opens when an alarm
is sounding. Pin 15 is a common lead for both relays.
Note: When the relay is closed there is approximately 27 ohms of
resistance.
Setting Nurse Call RS-232 Polarity
The nurse call polarity can be set to a high signal on an N-550 alarm
condition or a low signal on an N-550 alarm condition. Refer to the
N-550 service manual for setting the Nurse Call RS-232 polarity.
Setting Nurse Call Relays Normally Open/Closed
Data port pins 7 and 15 provide a relay that closes (nominally 27
ohms) when an alarm is sounding on the N-550. Pins 8 and 15
54
Page 63
Using the Data Port
provide a relay that opens when an alarm is sounding. Pin 15 is a
common lead for both relays. The relay operates whether the N-550 is
operating on AC power or battery.
N-550 55
Page 64
Blank Page
Page 65
Printing
Printing N-550 Real-Time Data
Real-time data is continuously sent to the data port on the back of the
N-550. Patient data can be obtained through the data port by
connecting to a computer or serial printer. When a real-time printout
or display is being transmitted to a printer or computer, a new line is
printed/displayed every 2 seconds. Column headings are printed/
displayed every 25 lines, or if one of the values in the column heading
is changed.
Note: If the data output stops transmitting, the N-550 must be turned
off and then turned back on.
When connecting the N-550 to a printer or computer, verify proper
operation before clinical use. Both the N-550 and the printer or PC
must be connected to a grounded AC outlet.
Any printer or computer connected to the N-550's data port must be
certified according to IEC Standard 60950. All combinations of
equipment must be in compliance with IEC Standard 60601-1-1
systems requirements. Anyone who connects a printer or PC to the
data output port configures a medical system and is therefore
responsible that the system complies with the requirements of system
standard IEC Standard 60601-1-1 and the electromagnetic
compatibility system standard IEC Standard 60601-1-2.
N-550 57
Page 66
Printing
1 — Data Port Connector
1. Connect the serial printer to the N-550's Data Port connector (1).
2. Turn on the printer.
3. Connect the N-550 to an AC outlet.
58
4. Turn on the N-550.
The printer will start printing real time trend data or the PC will start
displaying real time data at a rate of one line every 2 seconds.
Page 67
Figure 4: Real-Time Data Printout
Printing
Trend Data Printout
The format of data displayed when a trend printout is requested is the
same as the real-time data. The only differences are that “TREND” is
displayed in the top row instead of the “CRC: XXXX” software
verification number and there is no “Status” column.
Readings are displayed in 4-second intervals. The values on each row
are an average for the 4-second period.
At the end of the printout, an “Output Complete” line indicates that
the transmission was successful. If the “Output Complete” line is not
present, a corruption of the data may have been detected and the data
should be ignored.
N-550 59
Page 68
Printing
Column Headings
Figure 5: Trend Data Printout
Once a trend printout has begun, the N-550 must be turned off and
back on again before a new trend printout can begin.
Column headings are displayed or printed after every 25 lines, or if
one of the values in the column heading changes.
60
Page 69
Data Source
Data in the highlighted box above represents the model number of the
N-550, in this case the N-550.
Device/Software Revision Level
The next data field tells the user the software level (Version 1.00.00)
and a software verification number (CRC: XXXX). Neither of these
numbers should change during normal operation. The numbers may
change if the N-550 is serviced and receives a software upgrade.
Printing
Alarm Limits
The last data field in the top line indicates the upper and lower alarm
limits for %SpO
alarm setting (OFF). The SatSeconds setting may be OFF , 10, 25, 50,
or 100 depending on the SatSeconds alarm setting. In the example
above, the low alarm limit for SpO
is 100%. Pulse Rate alarm limits are 40 to 170 bpm. SatSeconds
alarm limit is set to off.
N-550 61
2 and for the pulse rate (PR), and the SatSeconds
2 is 85% and the upper alarm limit
Page 70
Printing
N-550 Mode
The N-550 mode is ADULT.
Data Column Headings
Actual column headings are in the third row of the column heading
line. Patient data that is presented in the chart, from left to right, are
the time that the patient data on the row was obtained, the current
%SpO
minute (bpm), the current Pulse Amplitude (PA), and the operating
status of the N-550.
2 value being measured, the current Pulse Rate in beats per
Time
62
The Time column represents the N-550 real-time clock. Refer to the
N-550 service manual to set the N-550 real-time clock.
Page 71
Patient Data
Printing
Patient data is highlighted in the display above. Parameter values are
displayed directly beneath the heading for each parameter. In this
example, the %SpO
2 is 100, and the pulse rate is 190 beats per
minute. An asterisk indicates that the parameter is outside the set
limits. If no data for a parameter is available, three dashes (- - -) are
displayed.
PA represents pulse amplitude. The number can range from 0 to 254.
There are no alarm parameters for this value. It can be used for
trending information as an indication of a change in pulse volume,
relative pulse strength, or circulation.
Operating Status
The Status column indicates alarm conditions and operating status of
the N-550. In this example, Pulse High (PH) means that the pulse rate
upper alarm limit has been exceeded. The status codes are listed
below. As many as four codes can be displayed at one time in the
Status column.
Code Meaning
AO Alarm Off
N-550 63
Page 72
Printing
Code Meaning
AS Alarm Silence
LB Low Battery
LM Loss of Pulse w/Motion
LP Loss of Pulse
MO Patient MOtion
PH Pulse Rate Upper Limit Alarm
PL Pulse Rate Lower Limit Alarm
PS Pulse Search
SH Saturation Upper Limit Alarm
SL Saturation Lower Limit Alarm
SD Sensor Disconnect
SO Sensor Off
Note: A sensor disconnect and sensor off will also cause three dashes
(- - - ) to be displayed in the patient data section of the printout.
64
Page 73
Sensors and Accessories
Selecting a Sensor
WARNING: Before use, carefully read the sensor directions for
use, including all warnings, cautions, and instructions.
WARNING: Do not use a damaged sensor or pulse oximetry
cable. Do not use a sensor with exposed optical components.
WARNING: Use only Nellcor sensor s and pulse oximetry cables
with the N-550. Other sensors or pulse oximetry cables may cause
improper N-550 performance.
Sensors and Accessories
WARNING: Use only one pulse oximetry cable to increase the
length of the sensor. Use of more than one pulse oximetry cable
may have an adverse effect on performance. Do not attach any
cable that is intended for computer use to the sensor port.
WARNING: Pulse oximetry readings and pulse signal can be
affected by certain ambient environmental conditions, sensor
application errors, and certain patient conditions.
WARNING: Tissue damage can be caused by incorrect
application or duration of use of an SpO
sensor site as directed in the sensor directions for use.
N-550 65
2 sensor. Inspect the
Page 74
Sensors and Accessories
http://www.mallinckrodt.com/respiratory/resp/Serv_Supp/ProductManuals.html
Table 2: Nellcor Oximetry Sensor Models and Patient Weights
WARNING: Do not immerse or wet the sensor.
When selecting a sensor, consider the patient's weight and activity
level, the adequacy of perfusion and the available sensor sites, the
need for sterility, and the anticipated duration of monitoring. For
more information, refer to Table 2 or contact your local Nellcor
representative.
For a complete and up-to-date listing of all sensors applicable to the
N-550, refer to the Sensor Accuracy Grid posted on the Internet at:
Follow the sensor sterilization procedures in the applicable sensor
directions for use (DFU).
XIMAX Sensor
O
O
XIMAX MAX-FAST adhesive forehead
sensor, single-patient-use
O
XIMAX Softcare nonadhesive sensor,
single-patient-use, preteen infant
O
XIMAX Softcare nonadhesive sensor,
single-patient-use, adult
O
XIMAX Softcare nonadhesive sensor,
single-patient-use, preteen infant
O
XIMAX adhesive sensor,
-pateint-use, adult
single
XIMAX adhesive sensor,
O
-pateint-use, adult, longer cable
single
36 inches (91.44 cm)
XIMAX adhesive sensor,
O
-pateint-use, neonatal/adult
single
Patient Size
Model
MAX-FAST
SC-PR <1.5 kg (3.3 lbs)
SC-NEO 1.5 to 5 kg (3.3 to
SC-A >40 kg (8 8 lbs)
MAX-A >30 kg (66 lbs)
MAX-AL >30 kg (66 lbs)
MAX-N <3 kg or >40 kg
>=greater than
<=less than
>10 kg (22 lbs)
11 lbs)
(<6.6 lbs or >88 lbs)
66
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Sensors and Accessories
Table 2: Nellcor Oximetry Sensor Models and Patient Weights
Patient Size
XIMAX Sensor
O
Model
>=greater than
<=less than
O
XIMAX adhesive sensor,
-pateint-use, pediatric
single
O
XIMAX adhesive sensor,
-pateint-use, infant
single
O
XIMAX adhesive sensor,
-pateint-use, adult nasal
single
O
XIMAX OxiCliq
-patient-use, adult, reusable cable
single
O
XIMAX OxiCliq nonadhesive sensor,
-patient-use, neonatal/adult,
single
®
nonadhesive sensor,
reusable cable
XIMAX OxiCliq nonadhesive sensor,
O
-patient-use, pediatric, reusable
single
cable
O
XIMAX OxiCliq nonadhesive sensor,
-patient-use, infant, reusable
single
cable
O
XIMAX Durasensor
®
finger-clip sensor,
reusable, adult
O
XIMAX Oxiband
®
sensor, reusable,
neonatal/adult
MAX-P 10 to 50 kg (22 to
110 lbs)
MAX-I 3 to 20 kg (6.6 to
44.1 lbs)
MAX-R >50 kg (110 lbs)
OxiCliq A >30 kg (66 lbs)
OxiCliq N <3 kg or >40 kg
(<6.6 lbs or >88 lbs)
OxiCliq P 10 to 50 kg (22 to
110 lbs)
OxiCliq I 3 to 20 kg (6.6 to
44.1 lbs)
DS
OXI
-100A
-A/N
>40 kg (88 lbs)
<3 kg or >40 kg
(<6.6 lbs or >88 lbs)
O
XIMAX Oxiband sensor, reusable,
pediatric/infant
OXI
-P/I
3 kg to 40 kg
(6.6 lbs to 88 lbs)
N-550 67
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Sensors and Accessories
Table 2: Nellcor Oximetry Sensor Models and Patient Weights
XIMAX Sensor
O
Model
Patient Size
>=greater than
<=less than
OXIMAX Dura-Y
reusable
For use with the Dura
Ear clip (Reusable, nonsterile)
Pedi
-Check
clip (Reusable, nonsterile)
®
TM
pediatric spot-check
Biocompatibility Testing
Biocompatibility testing has been conducted on Nellcor sensors in
compliance with ISO 10993-1, Biological Evaluation of Medical
Devices, Part 1: Evaluation and Testing. The sensors have passed the
recommended biocompatibility testing and are therefore in
compliance with ISO 10993-1.
Optional Accessories
multisite sensor,
-Y sensor:
D
-YS
D
-YSE
-YSPD
D
>1 kg (>2.2 lbs)
>30 kg (66 lbs)
3 kg to 40 kg
(6.6 lbs to 88 lbs)
68
Several optional accessories are offered with the N-550. Contact
Nellcor's Technical Services Department, 1.800.635.5267, or your
local Nellcor representative for information about these accessories.
• Foot switch
• Visual alarm indicator
• Pole mount bracket
Page 77
Foot Switch
Sensors and Accessories
Accessories for the N-550 are listed on the Internet at:
http://www.mallinckrodt.com/respiratory/resp/Serv_Supp/Apartweb/main/
PartAcceMenu.html
An optional foot switch is available for the N-550. The foot switch
may be used to silence N-550 alarms. The foot switch is conn ected to
the rear of the N-550.
CAUTION: The N-550 must be turned off when connecting or
disconnecting the foot switch.
1 — Foot switch connector
Visual Alarm Indicator
An optional visual alarm indicator is available for the N-550. The
visual alarm indicator mounted on the top of the N-550 with doubleback tape. The visual alarm indicator is connected to the rear of the
N-550.
CAUTION: The N-550 must be turned off when connecting or
disconnecting the visual alarm indicator.
N-550 69
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Sensors and Accessories
Pole Mount Bracket
1 — Visual alarm indicator
70
An optional pole mount bracket is available for the N-550. The pole
mount bracket may be used to attach the N-550 to an IV pole. The
pole mount bracket is attached to the rear of the N-550.
Page 79
Performance Considerations
WARNING: Pulse oximetry readings and pulse signals can be
affected by certain ambient environmental conditions, sensor
application errors, and certain patient conditions. See the
appropriate sections of the manual for specific safety
information.
Performance Verification
The performance of the N-550 can be verified by following the
procedures outlined in the Performance Verification section of the
N-550 service manual. Qualified service personnel should perform
these procedures before using the N-550 for the first time in a clinical
setting.
N-550 Performance Considerations
Certain patient conditions can affect the measurements of the N-550
and cause the loss of the pulse signal.
Inaccurate measurements can be caused by:
• prolonged patient movement
• venous pulsations
• intravascular dyes, such as indocyanine green or methylene
blue
• defibrillation
N-550 71
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Performance Considerations
Dysfunctional Hemoglobins
Dysfunctional hemoglobins such as carboxyhemoglobin,
methemoglobin, and sulphemoglobin are unab le to carry oxygen.
SpO
2 readings may appear normal; however, a patient may be
hypoxic because less hemoglobin is available to carry oxygen.
Further assessment beyond pulse oximetry is recommended.
Anemia
Anemia causes decreased arterial oxygen content. Although SpO2
readings may appear normal, an anemic patient may be hypoxic.
Correcting anemia can improve arterial oxygen content. The pulse
oximeter may fail to provide an SpO
5 gm/dl.
2 if hemoglobin levels fall below
Saturation
The N-550 will only measure saturation levels between 1 and 100%.
Pulse rates
The N-550 will only measure pulse rates between 20 and 250 beats
per minute. Detected pulse rates outside the range of 20 to 250 beats
per minute are displayed as the closest value within the range.
Sensor Performance Considerations
WARNING: Pulse oximetry readings and pulse signal can be
affected by certain ambient conditions, sensor application errors,
and certain patient conditions.
72
Page 81
Performance Considerations
Inaccurate measurements can be caused by:
• incorrect application of the sensor
• placement of the sensor on an extremity with a blood
pressure cuff, arterial catheter, or intravascular line
• ambient light
• prolonged patient movement
Loss-of-pulse signal can occur for the following reasons:
• the sensor is applied too tightly
• a blood pressure cuff is inflated on the same extremity as the
one with the sensor attached
• there is arterial occlusion proximal to the sensor
Use only Nellcor sensors and sensor cables.
WARNING: The use of accessories, sensor s, and cables other
than those specified may result in increased emission and/or
decreased immunity and inaccurate readings of the N-550 pulse
oximeter.
Select an appropriate sensor, apply it as directed, and observe all
warnings and cautions presented in the directions for use
accompanying the sensor. Clean and remove any substances such as
nail polish from the application site. Periodically check to ensure that
the sensor remains properly positioned on the patient.
WARNING: Tissue damage can be caused by incorrect
application or inappropriate duration of use of an SpO
2 sensor.
Inspect the sensor site as directed in the sensor directions for use.
N-550 73
Page 82
Performance Considerations
High ambient light sources such as surgical lights (especially those
with a xenon light source), bilirubin lamps, fluorescent lights,
infrared heating lamps, and direct sunlight can interfere with the
performance of an SpO
light, ensure that the sensor is properly applied and cover the sensor
site with opaque material.
Caution:Failure to cover the sensor site with opaque material in
high ambient light conditions may result in inaccurate
measurements.
If patient movement presents a problem, try one or more of the
following remedies to correct the problem.
2 sensor. To prevent interference from ambient
• verify that the sensor is properly and securely applied
• move the sensor to a less active site
• use an adhesive sensor that tolerates some patient motion
• use a new sensor with fresh adhesive backing
If poor perfusion affects performance, consider using the O
XIMAX
MAX-R sensor; it obtains measurements from the nasal septal
anterior ethmoid artery, an artery supplied by the internal carotid
artery. This sensor may obtain measurements when peripheral
perfusion is relatively poor.
74
Page 83
Operator’s Menu
This operator’s menu provides a quick reference to the functions on
the N-550. The functions that are Bold are the default settings.
Ta ble 3: Operator’s Menu
Menu
1 - Trend print (tabular
2 - Trend clear Clearing Trend
3 - Language English 4 -Baud rate: Setting the Data Port
-242400 baud -
- 96 9600 baud -
- 192 19200 baud -
5 - Data Port Protocol: Setting the Data Port
- 1ASCII -
- 2 External equipment
Sub-
Menu
Function
N-550 trend only)
communications.
Reference
Paragraph
Trend Data Printout
on page 59
Information on page
40
Baud Rate on page 37
Protocol on page 39
Refer to the external
equipment manuals
for the interfacing
instructions.
N-550 75
Page 84
Blank Page
Page 85
Troubleshooting
WARNING: If you are uncertain about the accuracy of any
measurement, check the patient's vital signs by alternate means;
then make sure the N-550 is functioning correctly.
WARNING: The cover should be removed only by qualified
service personnel. There are no user-serviceable parts inside.
CAUTION: Do not spray, pour, or spill any liquid on the N-550,
its accessories, connectors, switches, or openings in the chassis.
Error Codes
When the N-550 detects an error condition, it may display the letters
"EEE" followed by an error code.
When an error code is displayed, turn the N-550 off, wait 10 seconds,
and turn the N-550 on. If the error code is listed in Table 4, follow the
action(s) listed. If the action does not correct the error condition
notify service personnel. If the error code is not listed in Table 4,
notify service personnel.
When the N-550 detects a defective sensor connected to the N-550
the N-550 displays an error code of “Sen Err.” The sensor should be
replaced and the N-550 power should be recycled.
N-550 77
Page 86
Troubleshooting
Table 4: Error Codes
Corrective Action
If you experience a problem while using the N-550 and are unable to
correct it, contact Nellcor’s Technical Services Department or your
local Nellcor representative. The N-550 service manual, which is for
use by qualified service personnel, provides additional
troubleshooting information.
Error
Code
513 1 — Charge battery
2 — Notify service personnel.
514 1 — Restart the N-550.
2 — Notify service personnel.
525 1 — Restart the N-550.
2 — Notify service personnel.
526 1 — Restart the N-550.
2 — Notify service personnel.
528 1 — Restart the N-550.
2 — Notify service personnel.
Action
78
Following is a list of possible problems and suggestions for
correcting them.
Page 87
Troubleshooting
1. There is no response to the Power On/Off button.
• If the N-550 is operating on AC power, the fuse may be
blown. Notify service personnel to check and, if necessary,
replace the fuse.
• If the N-550 is on battery power , the battery fuse may require
replacement, the battery may be missing, or the battery may
be discharged. Charge the battery or notify service personnel
to replace the battery or the battery fuse, as required.
2. One or more display segments or indicators do not light
during the power-on self-test.
• Do not use the N-550; contact qualified service personnel or
your local Nellcor representative.
3. The N-550 does not sound a tone indicating successful
completion of the Power-On Self-Test (POST).
• The N-550 has failed the power-on self-test. Do not use the
N-550. This tone not only indicates the successful completion
of POST, but it confirms that the audible alarm is functional.
Contact qualified service personnel or your local Nellcor
representative.
4. The Pulse Search indicator is lit for more than 10 seconds
while the sensor is connected to the patient.
• Check the sensor directions for use to determine if an
appropriate sensor is being used and if it is applied properly.
Check sensor and sensor cable connections. Test the sensor
on someone else. Try another sensor or sensor cable.
N-550 79
Page 88
Troubleshooting
• Perfusion may be too low for the N-550 to track the pulse.
Check the patient. Test the N-550 on someone else. Change
the sensor site. Try another type of sensor.
• Excessive patient motion may be preventing the N-550 from
tracking the pulse. Keep the patient still, if possible. Verify
that the sensor is securely applied, and replace it if necessary.
Change the sensor site. Use a type of sensor that tolerates
more patient movement (for example, an adhesive senso r).
• The sensor may be too tight, there may be excessive ambient
light, or the sensor may be on an extremity with a blood
pressure cuff, arterial catheter, or intravascular line.
Reposition the sensor, as necessary.
• Excessive environmental motion or electromagnetic
interference may be preventing the N-550 from tracking the
pulse. Remove the source of interference or try to stabilize
the environment, or do both.
5. The Pulse Search indicator lights after successful
measurements have been ma de.
80
• Check the patient.
• Perfusion may be too low for the N-550 to track the pulse.
Test the N-550 on someone else. Change the sensor site. Try
another type of sensor. Refer to Sensor Performance
Considerations on page 72.
• Prolonged patient motion may be preventing the N-550 from
tracking the pulse. Verify that the sensor is securely applied
and replace it if necessary. Change the sensor site. Use a type
of sensor that tolerates more patient movement (for example,
an adhesive sensor).
• The sensor may be too tight, there may be excessive ambient
light, or the sensor may be on an extremity with a blood
pressure cuff, arterial catheter, or intravascular line.
Reposition the sensor, as necessary.
• Excessive environmental motion or electromagnetic
interference may be preventing the N-550 from tracking the
Page 89
Troubleshooting
pulse. Remove the source of interference or try to stabilize
the environment, or do both.
6. The letters EEE, followed by a number, appear on the display.
• This is an error code. To confirm, press the Power On/Off
button to turn the N-550 off, then press the button again to
turn it back on. If the display shows the error code once
again, record the number and provide that information to
qualified service personnel, or your local Nellcor
representative.
• Error Code “EEE 513" is displayed when the battery is
discharged to a critically low level. Turn th e N-550 off and let
it charge for about 10 minutes and then turn the N-550 back
on. If the error code is still present, turn the N-550 off and let
it continue to charge. If the N-550 has been charged for 30
minutes and the error code is still present, notify service
personnel.
Refer to the N-550 service manual for a complete listing of error
codes.
EMI (Electro-magnetic Interference)
CAUTION: This device has been tested and found to comply with
the limits for medical devices to the IEC 60601-1-2, EN60601- 1-2,
and the Medical Device Directive 93/42/EEC. These limits are
designed to provide reasonable protection against harmful
interference in a typical medical installation.
However, because of the proliferation of radio-frequency transmitting
equipment and other sources of electrical noise in health care
environments (for example, electrosurgical units, cellular phones,
mobile two-way radios, electrical appliances, and high-definition
television), it is possible that high levels of such interference due to
close proximity or strength of a source may result in disruption of
performance of this device.
N-550 81
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Troubleshooting
The N-550 is designed for use in environments in which the pulse can
be obscured by electromagnetic interference. During such
interference, measurements may seem inappropriate or the N-550
may not seem to operate correctly.
Disruption may be evidenced by erratic readings, cessation of
operation, or other incorrect functioning. If this occurs, the site of use
should be surveyed to determine the source of this disruption, and the
following actions taken to eliminate the source:
• Turn equipment in the vicinity off and on to isolate the
offending equipment.
• Reorient or relocate the interfering equipment.
• Increase the separation between the interfering equipment
and this equipment.
The N-550 generates, uses, and can radiate radio frequency energy
and, if not installed and used in accordance with these instructions,
may cause harmful interference with other devices in the vicinity.
If assistance is required, contact Nellcor’s Technical Services
Department, 1.800.635.5267, or your local Nellcor representative.
Obtaining Technical Assistance
For technical information and assistance, or to order parts or a service
manual, contact Nellcor’s Technical Services Department,
1.800.635.5267, or your local Nellcor representative. The service
manual includes block diagrams and a parts list required by qualified
personnel when servicing the N-550.
When calling Nellcor’s Technical Services Department,
1.800.635.5267, or your local Nellcor representative, you may be
asked to tell the representative the software version number of your
N-550.
The device version appears in the N-550 display each time the N-550
successfully completes the power-on self-test. Write the number
down and have it available whenever requesting technical assistance.
82
Page 91
Troubleshooting
The most recent revision of this manual and the service manual are
available on the Internet at:
http://www.mallinckrodt.com/respiratory/resp/Serv_Supp/
ProductManuals.html
N-550 83
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Blank Page
Page 93
Maintenance
CAUTION: Follow local governing ordinances and recycling
instructions regarding the disposal or recycling of device components
and accessories.
Returning the N-550
Contact Nellcor’s T echn ical Services Department, 1.800.635.5267, or
your local Nellcor representative for shipping instructions including a
Returned Goods Authorization (RGA) number. Unless otherwise
instructed by Nellcor’s Technical Services Department, it is not
necessary to return the sensor or other accessory items with the
N-550. Pack the N-550 in its original shipping carton. If the original
carton is not available, use a suitable carton with appropriate packing
material to protect it during shipping.
Return the N-550 by any shipping method that provides proof of
delivery.
Service
WARNING: The cover should be removed only by qualified
service personnel. There are no user-serviceable parts inside.
The N-550 requires no routine service or calibration other than
changing the battery at least every 24 months. Refer to the N-550
service manual for the battery changing procedure.
If service is necessary, contact qualified service personnel or your
local Nellcor representative.
N-550 85
Page 94
Maintenance
Periodic Safety Checks
It is recommended that the following checks be performed every 24
months.
• Inspect the equipment for mechanical and functional damage.
• Inspect the safety-relevant labels for legibility.
Cleaning
CAUTION: Do not spray, pour, or spill any liquid on the N-550,
its accessories, connectors, switches, or openings in the chassis.
For surface-cleaning and disinfecting the N-550, follow your
institution's procedures or:
•The N-550 may be surface-cleaned by using a soft cloth
dampened with either a commercial, nonabrasive cleaner or a
solution of 70% alcohol in water, and lightly wiping the
surfaces of the N-550.
86
•The N-550 may be disinfected using a soft cloth saturated
with a solution of 10% chlorine bleach in tap water.
Before attempting to clean an SpO
enclosed with the sensor. Each sensor model has cleaning instructions
specific to that sensor.
2 sensor, read the directions for use
Page 95
Technical Information
Description of Alarms
The N-550 has three levels of audible alarms.
1. High-priority alarm: A high-pitched, fast-pulsating tone
indicating loss of pulse with no patient motion.
2. Medium-priority alarm: A medium-pitched, normal-pulsating
tone indicating an SpO
During a medium-priority alarm, the green display turns red and
flashes with the patient parameter that violated the limit (%SpO
Pulse Rate). If the alarm is a SatSeconds alarm, the SatSeconds
indicator (clock) will flash.
2 or pulse rate limit violation.
2 or
3. Low-priority alarm: A low-pitched, slow-pulsating tone
indicating a sensor disconnect, low battery, or N-550 failure.
During a low-battery alarm, the Low Battery indicator illuminates
and the alarm tone sounds immediately, even if the alarms are
silenced or set to OFF.
N-550 87
Page 96
Technical Information
Factory Defaults
The N-550 is shipped with factory default settings. Authorized
technical personnel using the procedures described in the N-550
service manual can change default settings.
Table 5: Factory Default Settings
Factory
Parameter Range
Default
Setting
2 Upper Alarm
%SpO
Limit
2 Lower Alarm
%SpO
Limit
Pulse Rate Upper
Alarm Limit
Pulse Rate Lower
Alarm Limit
Alarm Silence
Lower Alarm Limit
plus 1 to 100%
20% to Upper Alarm
Limit minus 1
Lower Alarm Limit
plus 1 to 250 bpm
30 bpm to Upper
Alarm Limit minus 1
On or Off On
Reminder
Alarm Silence
Duration
Alarm Silence
Off, 30, 60, 90, 120
seconds
• Audible reminder
Restrictions
• No audible
reminder
• Do not allow
alarms off
Alarm Sound Selector 1, 2, 3 1
100%
85%
170 bpm
40 bpm
60 seconds
Audible
reminder
88
Alarm Volume 1 to 10 4
Data Port Baud Rate 2400, 9600, 19200 19200
Data Port Protocol 1, 2 1 (ASCII)
Page 97
Technical Information
Table 5: Factory Default Settings
Factory
Parameter Range
Default
Setting
Display 0, 1 0 (On)
In-Sensor Trend Mode 0, 1, 2 0 (Event SpO
Language English English
Pulse Beep Volume 0 to 10 4
RS-232 Nurse Call
Priority
SatSeconds Off, 10, 25, 50, 100 Off
Silence Alarms 0, 1 1 (Off)
SatSeconds Display
When the N-550 SatSeconds technology detects an SpO2 value
outside the alarm limit, the SatSeconds indicator LEDs begin to light
(fill) clockwise. When the SpO
SatSeconds indicator LEDs will extinguish counterclockwise.
When all of the SatSecond indicator LEDs are lit, indicating that the
SatSeconds setting has been reached, an audible alarm sounds and the
SatSeconds indicator LEDs flash. As with traditional alarm
management, the audible alarm may be silenced by pressing the
Alarm Silence button.
Normally high,
Normally low
normally low
2 value is within the set limits, the
2)
Note: When a SatSeconds setting other than OFF is selected, the
green LED at the top of the SatSeconds indicator will light. The
green LED indicates that SatSeconds have been engaged.
N-550 89
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Technical Information
Describing SatSeconds
With traditional alarm management, upper and lower alarm limits are
set for monitoring oxygen saturation. During monitoring, as soon as
an alarm limit is violated by as little as one percentage point, an
audible alarm immediately sounds. When the %SpO
near an alarm limit, the alarm sounds each time the limit is violated.
Such frequent alarms can be distracting.
The N-550 utilizes Nellcor SatSeconds alarm management. With the
SatSeconds technique, upper and lower alarm limits are set in the
same way as traditional alarm management. However, the clinician
also sets a SatSeconds limit that allows monitoring of %SpO
the selected lower alarm limit and above the selected upper alarm
limit for a period of time before an audible alarm sounds.
2 level fluctuates
2 below
The SatSeconds limit controls the time that the %SpO
2 level may fall
below the alarm limit before an audible alarm sounds.
The method of calculation is as follows:
The number of percentage points that the %SpO
alarm limit is multiplied by the number of seconds that the %SpO
2 falls outside the
2
level remains outside that limit. This can be stated as an equation:
Points x Seconds = SatSeconds
Where:
Points = SpO
Seconds = number of seconds that SpO
2 percentage points outside of the limit
2 remains at that
point outside of the limit
The alarm response time, assuming a SatSeconds limit set at 50 and a
lower alarm limit set at 90, is described and illustrated below.
90
Page 99
Technical Information
In this example, the %SpO2 level drops to 88 (2 points) and remains
there for a period of 2 seconds (2 points x 2 seconds = 4). The %SpO
then drops to 86 for 3 seconds and then to 84 for 6 seconds. The
resulting SatSeconds are:
2
%SpO
2 Seconds SatSeconds
2 x 2 = 4
4 x 3 = 12
6 x 6 = 36
Total SatSeconds =
52
After approximately 10.9 seconds, the SatSeconds alarm will sound,
because 50 SatSeconds will have been exceeded. See arrow (
↑) in
Figure 6.
Figure 6: Alarm Response with SatSeconds
N-550 91
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Technical Information
Saturation levels may fluctuate rather than remaining steady for a
period of several seconds. Often, %SpO
2 levels may fluctuate above
and below the alarm limit, reentering the non-alarm range several
times.
During such fluctuation, the N-550 integrates the number of %SpO
points, both positive and negative, until either the SatSeconds limit
(SatSeconds setting) is reached, or the %SpO
normal range and remains there.
SatSeconds “Safety Net”
The SatSeconds “Safety Net” is for patients whose saturation levels
frequently go below the limit but do not stay below the limit long
enough for the SatSeconds setting to be reached. When 3 or more
limit violations occur in 60 seconds, an alarm will sound even if the
SatSeconds setting has not been reached.
2
2 level returns within a
92
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