Nonin 9843 User manual

Operator’s Manual
Model 9843
Handheld Pulse Oximeter and
Carbon Dioxide (CO
2
) Detector
English

Nonin®reserves the right to make changes and improvements to this manual and the products it
describes at any time, without notice or obligation.
Nonin Medical, Inc.
13700 1st Avenue North
Plymouth, Minnesota 55441, USA
[phone]
[phone] (USA and Canada)
Fax: [phone]
E-mail: [email protected]
Nonin Medical B.V.
Prins Hendriklaan 26
1075 BD Amsterdam, Netherlands
+31 (0)13 - 79 99 040 (Europe)
Fax: +31 (0)13 - 79 99 042
E-mail: [email protected]
nonin.com
References to “Nonin” in this manual shall imply Nonin Medical, Inc. Nonin, PureLight and
nVISION are registered trademarks or trademarks of Nonin Medical, Inc. Microsoft®and
Windows®are registered trademarks of Microsoft Corporation.
© 2019 Nonin Medical, Inc.
7409-001-07
Follow Instructions for Use.

i
Contents
Indications for Use ........................................................................................ 1
Pulse Oximeter Intended Use.................................................................................1
Carbon Dioxide Detector Intended Use..................................................................1
Warnings ................................................................................................................1
Cautions .................................................................................................................2
Guide to Symbols.......................................................................................... 5
A General Description................................................................................... 7
About Pulse Oximetry.............................................................................................8
Carbon Dioxide Detector........................................................................................8
Unpacking the Model 9843.....................................................................................8
Installing and Using the Batteries...........................................................................9
Replacing Batteries.............................................................................................9
Important Notes about Battery Use...................................................................11
Displays and Indicators .............................................................................. 12
SpO2Display........................................................................................................12
Pulse Rate Display...............................................................................................12
Pulse Quality Indicator..........................................................................................12
Low Battery Indicator............................................................................................12
Sensor Fault or Inadequate Signal Display..........................................................12
Using the 9843 Pulse Oximeter.................................................................. 13
Connecting the Sensors.......................................................................................13
Pulse Oximeter Sensor.....................................................................................13
Carbon Dioxide Sensor and Airway Adapter Tube...........................................13
Turn On/Standby..................................................................................................13
Startup Self-Test...................................................................................................14
Pulse Oximeter Startup.....................................................................................14
Carbon Dioxide Detector...................................................................................15
Setup....................................................................................................................15
Setup Mode.......................................................................................................15
Choosing Settings.............................................................................................16
Visible Indicators ..................................................................................................17
SpO2Display ...................................................................................................17
Pulse Rate Display ...........................................................................................17
Dashes in the SpO2and Pulse Rate Displays..................................................17
Blinking SpO2and Pulse Rate Displays ...........................................................17
Pulse Quality Indicator .....................................................................................18
CO2Bar Graph ................................................................................................18
Low Battery Indicator........................................................................................19
Audible Indicators.................................................................................................19
Audible Breath Beep.........................................................................................19
CO2Sensor Indicator........................................................................................19

ii
Contents (Continued)
Carbon Dioxide (CO
2
) Sensor and Airway Adapter Tube ............................20
Carbon Dioxide Sensor.........................................................................................20
Airway Adapter Tube.............................................................................................21
Attaching the Airway Adapter Tube to the Carbon Dioxide Sensor...................22
Care and Maintenance .................................................................................24
Maintenance..........................................................................................................24
Cleaning the CO2Sensor......................................................................................24
Returning the CO2Sensor for Service..................................................................24
Memory Functions .......................................................................................25
Memory.................................................................................................................25
Recording Sessions..............................................................................................25
Memory Playback Mode....................................................................................26
Communications ..........................................................................................27
Real-Time Serial Output........................................................................................27
Connecting the Device into a Medical System......................................................28
Service, Support and Warranty...................................................................29
Warranty................................................................................................................29
Parts and Accessories.................................................................................30
Troubleshooting...........................................................................................31
Technical Information..................................................................................33
Manufacturer’s Declaration...................................................................................33
Equipment Response Time...................................................................................36
Testing Summary..................................................................................................37
SpO2Accuracy Testing .....................................................................................37
Pulse Rate Motion Testing.................................................................................37
Low Perfusion Testing.......................................................................................37
Principles of Operation..........................................................................................38
Specifications........................................................................................................38

iii
Figures
Figure 1. Model 9843 Pulse Oximeter and Carbon Dioxide Detector ........................ 7
Figure 2. Model 9843 Controls and Indicators........................................................... 7
Figure 3. Replacing Batteries - Model 9843, example only...................................... 10
Figure 4. Rear View - Model 9843, example only .................................................... 10
Figure 5. Connecting Sensors to the Model 9843.................................................... 13
Figure 6. Model 9840SA Carbon Dioxide Sensor .................................................... 20
Figure 7. Model 9840AAT Airway Adapter Tube...................................................... 21
Figure 8. Connecting the Airway Adapter Tube to the CO2Sensor......................... 22
Figure 9. The Airway Adapter Tube and the Breathing Circuit................................. 23

iv
Tables
Table 1. Symbols....................................................................................................... 5
Table 2. Calendar and Clock Mode Parameters...................................................... 16
Table 3. Electromagnetic Emissions........................................................................ 33
Table 4. Electromagnetic Immunity.......................................................................... 34
Table 5. Guidance and Manufacturer’s Declaration—Electromagnetic Immunity.... 35
Table 6. Recommended Separation Distances ....................................................... 36

1
Indications for Use
Indications for Use
The Nonin®Model 9843 Pulse Oximeter and Carbon Dioxide Detector is indicated for use in measuring
and displaying functional oxygen saturation of arterial hemoglobin (SpO2), pulse rate, and approximate
carbon dioxide (CO2) changes in the airway of intubated patients. These functions may be used
separately or simultaneously.
Pulse Oximeter Intended Use
The pulse oximeter is intended to be used for noninvasively monitoring oxygen saturation and pulse rate
for adult, pediatric, and neonatal patients in hospital, ambulatory, and Emergency Medical Services
(EMS) environments. The pulse oximeter may be used for spot checking and/or continuous monitoring
when attended by a healthcare professional.
Carbon Dioxide Detector Intended Use
The CO2detector is a mainstream device intended to be used for semi-quantitative detection of CO2
levels in intubated patients during patient transport, and for short-term hospital use (e.g. emergency
rooms or crash carts), and where gaseous anesthetic is not present. The CO2detector may be used to
initially confirm proper placement of the endotracheal tube and to provide continued confirmation of
correct endotracheal tube placement and patient respiration status. The CO2detector is not intended for
prolonged CO2monitoring. The CO2detector is not intended for long-term monitoring of end-tidal CO2.
The CO2detector is not intended for use in patients younger than 3 years old and weighing less than
10 kg (22 lb).
Contraindication: Do not use in an explosive atmosphere or in the presence of flammable anesthetics or gasses.
Warnings
Do not use this device in an MR environment.
Do not use the Model 9843 CO2detector for patients younger than 3 years old and weighing less than 10 kg (22 lb) due to
the dead space introduced by the airway adapter tube.
This device is not defibrillation proof per IEC 60601-1.
This device is intended only as an adjunct in patient assessment. It must be used in conjunction with other methods of
assessing clinical signs and symptoms.
Do not use the Model 9843 CO2detector during mouth-to-tube ventilation. The presence of CO2in the exhaled breath
from the person performing resuscitation will cause inaccurate readings.
The Model 9843 CO2detector cannot distinguish between oropharyngeal tube placement and endotracheal tube
placement if the airway is patent. Standard clinical assessment must be used.
Oximeter readings of this device may be affected by the use of an electrosurgical unit (ESU).
Do not use a damaged sensor. If the sensor is damaged in any way, discontinue use immediately and replace the sensor.
This device should not be used adjacent to or stacked with other equipment. If adjacent or stacked use is necessary, the
device should be observed carefully to verify normal operation.
The use of accessories, sensors, and cables other than those specified in the Parts and Accessories List may result in
increased electromagnetic emission and/or decreased immunity of this device.

2
Indications for Use
To avoid patient injury, use only with Nonin-branded PureLight®pulse oximeter sensors. These sensors are manufactured
to meet the accuracy specifications for Nonin Pulse Oximeters. Using other manufacturers’ sensors can result in improper
pulse oximeter performance.
To prevent improper performance and/or patient injury, verify compatibility of the monitor, sensor(s), and accessories
before use.
No modifications to this device are allowed as it may affect device performance.
Check the pulse oximeter sensor application site every 4 hours to determine the circulation, positioning, and skin
sensitivity of the patient. Each patient’s sensitivity to Nonin sensors may vary depending on their medical status or the
condition of their skin.
As with all medical equipment, carefully route patient cabling to reduce the possibility of entanglement, strangulation, or
injury to the patient.
Discontinue use of adhesive tape strips if the patient exhibits an allergic reaction to the adhesive material.
Avoid excessive pressure to the sensor application site as this may cause damage to the skin beneath the sensor.
Do not reuse the Model 9840AAT Airway Adapter Tube.
If the airway adapter tube or airway adapter tube packaging appears or becomes contaminated or damaged, discard it
and replace it with a new one. Cleaning the interior will damage the anti-fog coating and cause inaccurate readings.
The Model 9840AAT Airway Adapter Tube will increase dead space by approximately 6 cubic centimeters (0.4 cubic
inches); this may adversely affect ventilation for patients with small tidal volumes.
If the Model 9843 CO2detector results are inconclusive, the correct anatomic location of the endotracheal tube must be
confirmed by other methods.
Do not use the Model 9843 CO2detector with a humidifier or nebulizer in the breathing circuit, as the fine mist may cause
erroneous readings.
The device turns off after approximately 10 minutes when at critically low battery capacity.
This device must be able to measure the pulse properly to obtain an accurate SpO2measurement. Verify that nothing is
hindering the pulse measurement before relying on the SpO2measurement.
Operation of this device below the minimum amplitude of 0.3% modulation may cause inaccurate results.
Before changing the batteries, make sure the device is off and the sensor is not attached to a digit.
Cautions
Before use, carefully read the Instructions for Use provided with sensors and airway adapters.
This device is a precision electronic instrument and must be repaired by trained Nonin personnel only. Field repair of the
device is not possible. Do not attempt to open the case or repair the electronics. Opening the case may damage the
device and void the warranty.
Any sign or evidence of opening the system, field service by non-Nonin personnel, tampering, or any kind of misuse or
abuse of the system, shall void the warranty in its entirety.
When mounting the monitor to a mobile pole, mounting the monitor higher than 1.5 meters (5 feet) or mounting more than
2 kilograms (4.5 pounds) of equipment onto the pole may results in tipping, damage to the equipment, or injury.
This device is not an apnea monitor.
Verify that all visible indicators illuminate during the startup (initialization) sequence. If any indicator is not lit, do not use
the device. Contact Nonin Technical Service for assistance.
Warnings (Continued)

3
Indications for Use
The presence of a defibrillator may interfere with the performance of this device.
This device may not work on all patients. If you are unable to achieve stable readings, discontinue use.
This device has motion tolerant software that minimizes the likelihood of motion artifact being misinterpreted as good
pulse quality. In some circumstances, however, the device may still interpret motion as good pulse quality. Minimize
patient motion as much as possible.
Ear Clip and Reflectance sensors are not recommended for pediatric or neonatal use. The accuracy of these sensors has
not been established for pediatric or neonatal use.
Do not autoclave or immerse the device or sensors in liquid. Do not expose the device or components to excessive
moisture or liquids.
Do not use caustic or abrasive cleaning agents on the device or the sensors.
The oximeter sensor might not work on cold extremities due to reduced circulation. Warm or rub the finger to increase
circulation, or reposition the sensor.
The device is not designed to retain data in memory once the batteries are removed. Memory will clear 60 seconds after
removing the batteries. Replacing the batteries before 60 seconds have elapsed most likely will result in corrupt data.
Always replace the batteries with fully charged batteries. Do not use fully charged and partially charged batteries at the
same time as this may cause the batteries to leak.
Use only Nonin-specified battery types with this device.
Do not use different types of batteries at the same time. Do not mix fully charged and partially charged batteries at the
same time. These actions may cause the batteries to leak.
Do not remove any covers other than the battery cover when replacing batteries. There are no user-serviceable parts
inside other than the replaceable batteries.
Batteries may leak or explode if used or disposed of improperly.
Remove the batteries if the device will be stored for more than 1 month.
Follow local, state and national governing ordinances and recycling instructions regarding disposal or recycling of the
device and device components, including batteries.
In compliance with the European Directive on Waste Electrical and Electronic Equipment (WEEE) 2002/96/EC, do not
dispose of this product as unsorted municipal waste. This device contains WEEE materials; please contact your distributor
regarding take-back or recycling of the device. If you are unsure how to reach your distributor, please call Nonin for your
distributor’s contact information.
All parts and accessories connected to the serial port of this device must be certified according to at least IEC Standard
EN 60950, IEC 62368-1, or UL 1950 for data-processing equipment.
This equipment complies with IEC 60601-1-2 for electromagnetic compatibility for medical electrical equipment and/or
systems. This standard is 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 healthcare and other environments, it is possible that high levels of such interference due to close
proximity or strength of a source might disrupt the performance of this device. Medical electrical equipment needs special
precautions regarding EMC, and all equipment must be installed and put into service according to the EMC information
specified.
Do not use the airway adapter tube if the airway adapter tube is below 5° C (41° F). An airway adapter tube that is below
5° C (41° F) may frost, causing a false reading. Warm the airway adapter tube to above 5° C (41° F) by putting it in a warm
place (for example, in your hands or in a vehicle) prior to use.
An airway adapter that is between 5 °C (41 °F) and 10 °C (50 °F) may cause inaccurate reading due to fogging of optical
surfaces. It is recommended that the airway adapter tube be warmed to above 10 °C (50 °F) before use.
Cautions (Continued)

4
Indications for Use
This device is designed to determine the percentage of arterial oxygen saturation of functional hemoglobin. Factors that
may degrade pulse oximeter performance or affect the accuracy of the measurement include the following:
Portable and mobile RF communications equipment can affect medical electrical equipment.
A functional tester cannot be used to assess the accuracy of a pulse oximeter monitor or sensor.
Remove earrings from the patient’s ear before applying the Ear Clip sensor.
Water or other liquid between the airway adapter tube and the CO2sensor may cause erroneous readings.
Ensure that all connections to the airway adapter tube are tight and leak-free, and that the airway adapter tube is properly
attached to the CO2sensor.
Ensure that this device, the airway adapter tube, and the sensors have stabilized at the specified environmental operating
conditions before use.
Gastric distention with air prior to intubation may introduce CO2into stomach and esophagus and yield false results.
Observe six breaths before interpreting results.
This device’s CO2detector must not be used with gaseous anesthetics.
Do not block the audible indicator speaker holes. Blocking the speakers will significantly reduce the sound volume.
Verify that the audible alarms can be heard over the ambient noise of the operating environment.
Failure of a network data coupling (serial cable/connectors) will result in loss of data transfer.
Cautions (Continued)
- excessive ambient light
- excessive motion
- electrosurgical interference
- blood flow restrictors (arterial
catheters, blood pressure cuffs,
infusion lines, etc.)
- moisture in the sensor
- improperly applied sensor
- incorrect sensor type
- inadequate signal
- venous pulsations
- anemia or low hemoglobin
concentrations
- cardiogreenandotherintravascular
dyes
- carboxyhemoglobin
- methemoglobin
- dysfunctional hemoglobin
- artificial nails or fingernail polish.
- residue (e.g., dried blood, dirt,
grease, oil) in the light path

5
Guide to Symbols
Guide to Symbols
This table describes the symbols that are found on the Model 9843 and in this manual.
Table 1 : Symbols
Symbol Description
CAUTION!
Consult Instructions for Use.
Follow Instructions for Use.
Type BF Applied Part (Patient isolation from electrical shock).
UL Mark for Canada and the United States with respect to electric shock, fire, and
mechanical hazards only in accordance with UL 60601-1 and CAN/CSA C22.2
No. 601.1.
SN Serial Number (located on the back cover).
IP32 Protected against vertically falling water drops when enclosure is tilted up to
15 degrees and ingress of solid foreign objects greater than or equal to 2.5 mm
(0.1 in.) in diameter per IEC 60529.
Indicates separate collection for electrical and electronic equipment (WEEE).
Manufacturer
Catalogue Number
Quantity
Date of Manufacture
Country of Manufacture
Storage/Shipping Temperature Range
RoHS Compliant (China)
Federal law (USA) restricts this device to sale by or on the order of a licensed
practitioner.
!
REF
REF
QTY
QTY
US

6
Guide to Symbols
Front Panel Buttons
ON/Standby
Advance/Beep Volume Control
Set-up/Event Marker
Display Indicators
SpO2%SpO2Display
Battery Indicator
Pulse Rate Display
Pulse Quality Indicator
CO2Change in CO2Concentration
No Alarms
Table 1 : Symbols (Continued)
Symbol Description


7
A General Description
A General Description
Nonin 9843 Pulse Oximeter and Carbon Dioxide Detector is a hand-held, battery-operated, noninvasive
monitoring device that has visible and/or audible indicators for tracking patient and equipment status.
The 9843 will typically operate for 90 hours continuously between battery replacements when used for
pulse oximetry alone, or for 20 hours continuously when used for both CO2detection and pulse oximetry.
Figure 1: Model 9843 Pulse Oximeter and Carbon Dioxide Detector
Figure 2: Model 9843 Controls and Indicators
'CO2
%SpO2
888
Model 9843
888
m
m
H
g
k
P
a
SpO2Display
CO2Sensor
Connector
Audible Indicator
(Speaker)
On / Standby
Set-up / Event
Marker
Tri-ColorPulseQuality
(LED) Indicator
CO2BarGraph
Display
Pulse Rate
(LED) Display
Low Battery
(LED) Indicator
Pulse Oximeter
Sensor Connector
Advance/Beep
Volume Control Keypad

8
A General Description
About Pulse Oximetry
9843determinesfunctionaloxygensaturationofarterialhemoglobin(SpO2)bymeasuringthe absorption
of red and infrared light passed through perfused tissue. Changes in absorption caused by pulsation of
blood in the vascular bed are used to determine arterial saturation and pulse rate.
Oxygen saturation and pulse rate values are indicated on light-emitting diode (LED) digital displays. On
each detected pulse, the pulse quality indicator blinks. Patient pulse quality signals are graded as good,
marginal, or inadequate and are indicated as such by the pulse quality indicator blinking green, yellow,
or red respectively. This simple method gives the user a pulse-by-pulse visual indication of waveform
signal quality without requiring the user toperform complex waveform analysis during criticalpatient care
situations.
If an inadequate pulse is detected, the pulse quality indicator will blink red.
If the pulse oximeter sensor is disconnected, malfunctions, or an adequate signal is not detected:
• a dash appears in the leftmost position of the SpO2display,
• the displayed SpO2and pulse rate values will freeze for 10 seconds, and
• 10 seconds after the first dash appears, the SpO2and pulse rate values will be replaced by dashes,
if the condition is not corrected.
Carbon Dioxide Detector
9843 determines approximate CO2changes in the airway of intubated patients by measuring the
absorption of mid-infrared light passed through the airway adapter tube. The approximate CO2
concentration change is indicated by an 8-segment LED bar graph display. The CO2detector relies on
the assumption that the inhaled air contains minimal amounts of CO2.
Breaths are indicated when the CO2level increases by approximately 5 mmHg during exhalation. A
detected breath is indicated on the CO2bar graph and by an audible breath beep.
When no breath is detected:
• the no breath indicator blinks and
• the lowest CO2bar graph segment will be illuminated, and CO2readings will be displayed with the
next breath detected.
Unpacking the Model 9843
Contact the carrier immediately if the shipping carton is damaged. Carefully unpack the device and its
accessories. Nonin’s standard packaging configuration consists of the items listed below:
• 1 Model 9843 Pulse Oximeter and CO2Indicator
• 1 Operator’s Manual (on CD)
• 1 Model 8000AA-1Adult Articulated Finger Clip Sensor
• 1 Model 9840SA Carbon Dioxide Sensor
• 3 Model 9840AAT Airway Adapter Tubes
• 6 AA-Size Alkaline Batteries
If any item on this list is missing or damaged, contact your distributor.

9
A General Description
Installing and Using the Batteries
9843 is powered by six AA size alkaline batteries. Approximate battery capacity:
• Pulse Oximeter (SpO2) only: 90 hours
•CO
2and Pulse Oximeter: 20 hours
•CO
2 only: 24 hours.
Low battery indicator illuminates when the battery capacity is low. The batteries should
be replaced as soon as possible.
Critical battery capacity is indicated by:
• low battery indicator blinks
• no patient data displayed
To avoid loss of monitoring, batteries must be replaced immediately.
If the batteries are critically low when the device is turned on, setup mode will be disabled and the
displays will be blank. Replace the batteries before continuing.
NOTE: To conserve battery life disconnect the CO2sensor not in use.
NOTE: Setting the month to “00” disables the calender and clock functions and helps conserve
battery life. Refer to “Choosing Settings - Calender Setting” on page 16.
Replacing Batteries
1. Slide open and remove the battery door on the bottom of the device.
2. Remove all six batteries.
3. Replace all six batteries with newAA size batteries as illustrated below with the proper battery
orientation noted on the back of the device.
CAUTION: Use only Nonin-specified battery types with this device.
WARNING: Before changing the batteries, make sure the device is off and the sensor
is not attached to a digit.
CAUTION: The device is not designed to retain data in memory once the batteries
are removed. Memory will clear 60 seconds after removing the batteries. Replacing
the batteries before 60 seconds have elapsed most likely will result in corrupt data.
Always replace the batteries with fully charged batteries. Do not use fully charged
and partially charged batteries at the same time as this may cause batteries to leak.
!
!

10
A General Description
Figure 3: Replacing Batteries - Model 9843, example only
Figure 4: Rear View - Model 9843, example only
IMPORTANT:Insertthese
two batteries first.
Battery Door
Battery Orientation
5808-004-04
US PATENT # Re. 33,643
6x1.5V AA IEC LR6
PULSE OXIMETER/CO2 DETECTOR
MODEL 9843
PLYMOUTH, MN USA
NONIN MEDICAL, INC.
IP32
UL 60601-1
30EM
SEE ACCOMPANYING DOCUMENTS
0123
Serial Number
Battery Door
Battery
Orientation

11
A General Description
When batteries are critically low, the digital displays will go blank, and the Pulse Quality display will blink
yellow or red, but not green. After 10 minutes at critically low battery capacity, the pulse oximeter will shut
off automatically.
.
Important Notes about Battery Use
• To conserve battery life, Nonin recommends disconnecting the CO2sensor from the 9843 when
CO2detection is not in use.The flashing lamp in the CO2sensor consumes a significant amount of
energy.
• Setting the month to “00” disables the calendar and clock functions and helps conserve battery life.
Refer to “Calendar Setting” on page 16 for additional information.
• The memory of the 9843 may be erased when the batteries are removed.
• Replacing batteries may erase the clock settings of the 9843.
• Six AA alkaline batteries provide the device with approximately 90 hours of continuous operation.
•Calendar/clock settings can affect battery storage life. Batteries drain during storage, but they
drain more quickly when the unit’s calendar/clock functions are set. Refer to Calendar/Clock
settings (starting on page 16) for more information.
• Ifthe calendar/clock isnot set whenthe unitis stored, alkaline batteries will need replacement
in 10–12 months if the unit has not been used.
• If the calendar/clock is set when the unit is stored and if the unit has not been used, alkaline
batteries will require replacement in about 6 weeks.
WARNING: The device turns off after approximately 10 minutes when at critically low
battery capacity.
CAUTION: Replace the batteries as soon as possible after a low battery indication.
Always replace the batteries with fully charged batteries. Do not use fully charged and
partially charged batteries at the same time. This may cause the batteries to leak.
CAUTION: Remove the batteries if the device will be stored for more than 1 month.
!
!

12
Displays and Indicators
Displays and Indicators
SpO2Display
The SpO2display is identified by the SpO2 symbol. This 3-digit light-emitting diode (LED) display shows
the current oxygen saturation percentage.
Pulse Rate Display
The Pulse Rate display is identified by the symbol. This 3-digit LED display shows the pulse rate
in pulses per minute.
Pulse Quality Indicator
ThePulse QualityIndicatordisplay, identifiedbythe symbol, isatricolorLEDthat blinksonceforeach
detected pulse. The color of the Pulse Quality indicator changes with the pulse strength signal, as
described below.
•Green indicates a good pulse strength signal.
•Yellow indicates a marginal pulse strength signal. To improve signal quality, reposition the sensor,
try a different sensor type, reduce patient movement, or improve the site’s circulation.
•Red indicatesan inadequatepulse strengthsignal. Whilethe PulseQuality displayis red,SpO2and
pulse rate values are not updated. After about 10 seconds, the values are replaced with dashes,
indicating that readings are not possible.
Low Battery Indicator
When the battery level is low, the low battery indicator is lit. When the batteries reach critically low
level, the display will be blank and the low battery indicator will blink.
Sensor Fault or Inadequate Signal Display
If the device determines that a sensor fault or inadequate signal condition exists (a sensor disconnect,
failure, misalignment or incompatibility with the monitor) or if a pulse oximeter sensor signal is no longer
detected, a dash (-) appears in the leftmost position of the SpO2display. The readings that are displayed
will freeze for 10 seconds if the pulse oximeter sensor fault or the inadequate signal continues.
If the sensor fault or the inadequate signal is not corrected, the frozen readings and the dash in the
leftmost position will be replaced by dashes in the middle of both the SpO2and the Pulse Rate displays.
When the sensor fault or the inadequate signal is corrected, the SpO2and pulse rate displays will return
to normal operation.

13
Using the 9843 Pulse Oximeter
Using the 9843 Pulse Oximeter
Connecting the Sensors
Pulse Oximeter Sensor
Attach the sensor (with the Nonin logo facing up) to the device as shown in Figure 5 below. Verify the
sensor is securely connected.
Figure 5: Connecting Sensors to the Model 9843
Carbon Dioxide Sensor and Airway Adapter Tube
Connect the CO2sensor (with the Nonin logo facing up) to the side of the device as shown in Figure 5
above. Verify the sensor is securely attached. Refer to “Carbon Dioxide Sensor” for more information.
Turn On/Standby
Turn on (or off) the device by pressing the ON/Standby button. To conserve battery life, the device
automatically enters standby after 10 minutes of inactivity. Inactivity is indicated by dashes on the
displays and may result from an improperly connected or positioned sensor, or from an inadequate
patient pulse signal.
Pulse Oximeter
Sensor
CO2Sensor/Airway
Adapter Tube

14
Using the 9843 Pulse Oximeter
Startup Self-Test
When the device is turned on, the device will cycle through a startup/initialization sequence before
displaying valid data. During startup, always check for any missing indicators or LED display segments.
If any indicator is not functioning, do not use the device. Contact Nonin Technical Service for repair or
replacement.
During its normal startup sequence, the device will cycle as follows:
• The audible breath beeps three times.
• Thelowbatteryindicatorwill displayforapproximately2 seconds,unlessthebatteries
are low.
• The pulse quality indicator will blink red, then green. The device will enter standby if
no pulse oximeter sensor is connected.
•TheSpO
2and pulse rate displays will sequence as follows:
1. “888 888”.
2. The current time (if set) or “00 00” if the time is not set.
3. Display 3 software revision numbers; oximetry/display software rev #, then CO2
memory software rev #, then sound module software rev. # (approximately 1
second each).
4. Any sensor connection issues:
• if a sensor is not connected the display will revert to blank, or
• if a sensor is connected but is not detecting an adequate signal, a single dash (-) will appear in
the middle position of both displays, or
• if entering setup mode, the device will display the year (“y” and 2 digits for the current year).
The CO2bar graph sequence is:
• each segment illuminates once,
• remains blank (until CO2sensor is connected to the device), or
•(ifCO
2sensor is connected to the device) bottom segment illuminates when ready
for use.
Pulse Oximeter Startup
Apply the pulse oximeter sensor to the patient as directed in the sensor Instructions for Use. Verify
operation by:
• the pulse quality indicator is blinking green and
• the pulse rate and SpO2(%SpO2) displays are showing values and
• the pulse quality indicator blinking is correlated to the pulse rate for at least 10 seconds.
If the pulse quality indicator LED is blinking red or yellow or is blinking inconsistently, reposition the
sensor or replace the sensor.
%SpO2
888
88
8
Δ
Δ
CO
CO2
m
m
H
g
k
P
a
75
30
50
2
6
10
20
10
4
7
0.3
0.8
1.3
2.6