Nuvair Pro CO User manual

User Manual
Pro CO Alarm
Carbon Monoxide Analyzer
Rev. 03.19

Quick Reference Guide
READ ENTIRE MANUAL BEFORE USE
1. To switch on, hold the On/Off button until the display powers up.
2. To turn off, hold the On/Off button until the display goes blank.
3. Gas flow to the analyzer should be regulated to .5-3 L/min with no pressure on the
sensor. Pressurizing the sensor will lead to inaccurate readings and could damage it.
4. If using a Nuvair 9517.6 flow reducer for sample flow, the incoming pressure should be
75-100 PSI.
5. Press and hold the Adjust button to view the battery voltage and current ambient
temperature in Celsius.
a. Conversion formula to Fahrenheit: (°C x 1.8)+32=°F
6. Press and hold the Prog button to access the programming pages for:
a. Alarm 1 (AL1) sets the low level alarm (setting to 300 turns this off).
b. Alarm 2 (AL2) sets the high level alarm (setting to 300 turns this off).
c. Full Scale Value (FSC) sets the mA value for the optional output.
d. Conversion Value (nA) is only to be set when a new sensor is installed.
e. Gain Factor (Fct) is only to be set when a new sensor is installed.
f. Calibration value (CAL) is to be adjusted to the CO content of the certified
calibration test gas being used.
g. End is displayed after the last programming page. The display will then return to
the current gas reading value.
7. Press the On/Off button to cycle through the programming screens, the Prog button to
change the value of the blinking digit, and the Adjust button to select which digit to
program.
8. To calibrate the Analyzer Span:
a. Turn on the analyzer and program the CAL value to the CO content of the
calibration gas to be used.
b. Connect the sensor to calibration gas and allow to flow for 2-3 minutes. Flow
should be regulated to 1 L/min with no pressure on the sensor.
c. When the reading is stable, press the On/Off and Adjust buttons
simultaneously and hold until the display flashes “Cal”.
d. The unit is calibrated once the screen returns to the gas reading display. If the
reading drifts after calibration, allow the unit to sit while turned on for a few
minutes so the sensor temperature can stabilize, then repeat steps a-c.
9. To calibrate the Analyzer Zero:
a. Turn on the analyzer.
b. Attach a flow of certified 0 PPM CO, 100% Nitrogen test gas regulated to .5-3
L/min.
c. Press the Prog and Adjust buttons simultaneously and hold until the display
flashes “Cal”.
d. When the display returns to reading 000, the zero has been set.
10. If equipped with a lithium battery, read and understand all instructions included with
the battery charger.
11. Any wind or breeze present while using the analyzer can affect readings.

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If you have any questions on this equipment please contact Technical Support at:
Nuvair
1600 Beacon Place
Oxnard, CA 93033
Phone: [phone]
FAX: [phone]
Email: [e-mail]
Hours: Monday through Friday
8:00 AM to 5:00 PM PST USA
This User Manual contains important safety information and should always be
available to those personnel operating this equipment. Read, understand, and retain
all instructions before operating this equipment to prevent injury or equipment
damage.
Every effort was made to ensure the accuracy of the information contained within this manual;
however, we retain the right to modify its contents without notice. If you have problems or questions
after reading the manual, stop and call for information.

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Table of Contents
1.0 Introduction…………………………………………………………………………………….
2.0 System Description……………………………………………………………………………..
2.1 Controls………………………………………………………………………………….
2.2 Display…………………………………………………………………………………..
2.3 Alarm……………………………………………………………………………………..
2.4 Sensor……………………………………………………………………………………
2.5 Batteries…………………………………………………………………………………
2.6 Flow Adapter Cap………………………………………………………………………
3.0 Calibration……………………………………………………………………………………….
3.1 Sample Flow Method………………………………………………………………….
4.0 Operation…………………………………………………………………….…………………..
4.1 Programming Procedures………………………………………………………………
4.2 Alarm Setting…………………………………………………………….………………
4.3 Full Scale Value Setting………………………………………………………..………
4.4 Conversion Value of Carbon Monoxide Sensor…………………………………….
4.5 Gain Factor ……………………………………………………………….…………….
4.6 Calibration Value……………………………………………….………………………
5.0 Threshold Alarms………………………………………………………………...……………..
6.0 Powering Off…………………………………………………………………………………….
7.0 Factory Reset…………………………………………………………………………………...
8.0 Maintenance…………………………………………………………………………………….
8.1 Analyzer Care……………………………………………………………………………
8.2 9V Battery Replacement…………………………………………………………….…
8.3 Sensor Replacement……………………………………………………………..…….
8.3.1 Handling Sensor………………………………………………………....……………
9.0 Spares and Accessories………………………………………………………………………..
9.1 Sensor………………………………………………………………………………..….
9.2 Calibration Equipment…………………………………………………………………..
10.0 Troubleshooting………………………………………………………………………….……
11.0 Relay Output Schematics……………………………………………………………………
Appendix
Analyzer Specifications…………………………………………………………………………….
Warranty………………………………………………………………………………………………
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1.0Introduction
This manual will assist you in the proper set-up, operation and maintenance of the Pro COTM
Carbon Monoxide Analyzer. Be sure to read the entire manual.
Throughout this manual we will use certain words to call your attention to conditions,
practices or techniques that may directly affect your safety. Pay particular attention to
information introduced by the following signal words:
Indicates an imminently hazardous situation, which if not avoided, will result in serious
personal injury or death.
Indicates a potentially hazardous situation, which if not avoided, could result in
serious personal injury or death.
Indicates a potentially hazardous situation, which if not avoided, may result in minor or
moderate injury. It may also be used to alert against unsafe practices.
Notifies people of installation, operation or maintenance information which is
important but not hazard-related.

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2.0System Description
The Pro COTM Carbon Monoxide Analyzer measures carbon monoxide (CO) levels in gases
in the range of 0 to 100 parts per million (ppm). It can be used to measure the CO content in
gas mixes that may be contaminated due to the introduction of CO from internal combustion
engines or other devices where CO is a byproduct. The Analyzer is designed to verify CO
concentration in stored gas cylinders as well as to monitor enclosed spaces. The Analyzer is
a water and impact resistant unit compatible with outdoor and marine environments.
Carbon monoxide is a colorless, odorless, tasteless gas that will not support life.
Exposure to carbon monoxide can lead to unconsciousness and death.
The Analyzer is battery powered and includes an
internally mounted Sensor with audible alarm. The
Water-Resistant Case includes a Digital Display and
controls that are environmentally sealed
The Analyzer uses a Flow Adapter Cap and Flexible
tubing to deliver sample gas to the Sensor.
Pressurized gases must be regulated to avoid
damage to the analyzer. Use of this Analyzer in a
hyperbaric chamber will void the owner’s warranty.
The Analyzer comes in a high impact storage case.
It is ready for use after calibration with an
appropriate certified calibration gas.
This analyzer is designed for use at atmospheric pressures only. It is not designed for
exposures in a hyperbaric chamber. Use of this analyzer in a hyperbaric chamber will
result in incorrect readings and may damage the unit.
Although the Analyzer is a rugged instrument, careless handling or abuse may result
in damage to the Analyzer resulting in inaccurate gas analysis. Inaccurate gas analysis
can lead to serious personal injury or death.
Extreme CO exposure levels directed at the Analyzer sensor may damage the sensor.
Don’t test the sensor in the direct flow of any engine mufflers/exhausts or any other
known high concentrations of CO.
Flow
Adapter Cap
Over Sensor
Face
Water-
Resistant
Case

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2.1.Controls
2.2.Display
2.3.Alarm
The Analyzer includes an audible alarm that is activated when the Sensor reaches 10 ppm
CO or user programmed level. The alarm will not clear until the concentration of CO drops
below 10 ppm or user programmed level.
2.4.Sensor
The Analyzer uses an electrochemical CO Sensor to measure CO content in gases. The
Sensor is disposable and user-replaceable, with a life expectancy of up to 24 months
depending on usage. The Sensor is designed for use at atmospheric pressure (0 psi). The
gas mixture to be analyzed must be regulated accordingly, and any potential for pressure or
vacuum must be avoided.
2.5.Batteries
One standard 9-volt battery or rechargeable Lithium battery provides power. The battery is
located inside the Analyzer and is user-replaceable. The battery should be removed any time
the Analyzer will be stored without use for extended periods of time. Screen will blink
alternately from “000” to “bAt” at start up when battery is low.
Digital
Display
On/Off Button
Low Battery
Indication
Adjust Button
Optional
Relay Output
Program Button
Carbon Monoxide
Reading
0 – 100 ppm
In 1 ppm
increments

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2.6.Flow Adapter Cap
The Analyzer includes a Flow Adapter Cap with flexible tubing and flow orifice. It attaches to
the Sensor port and is sealed by an o-ring. It can be used to direct the gas sample flow to the
Sensor via one of two methods:
3.0Calibration
Analyzer calibration must be verified on a weekly basis. Improper calibration may
result in an incorrect reading, exposing the user to dangerous levels of carbon
monoxide. Exposure to carbon monoxide can lead to unconsciousness and death.
This Analyzer must always be checked against a calibration gas and used with gases
regulated and supplied at atmospheric pressure (0 psi). Use of gases at higher
pressures may result in incorrect readings and may damage the Analyzer. Incorrect
readings may expose the user to high levels of carbon monoxide resulting in personal
injury or death.
Checking Calibration or use of the Analyzer with a low battery may result in inaccurate
readings. Inaccurate gas analysis can lead to serious personal injury or death.
If the Analyzer has been subjected to a recent change in ambient temperature, allow it
to stabilize for one hour before checking calibration.
Verify calibration on a weekly basis. Breathing gas applications require the use of a certified
CO calibration gas with a 10 ppm concentration and flow rate of 1 L/min. The equipment to
produce this flow is available from Nuvair. See Spares and Accessories section.
To assure the greatest accuracy for other applications, use the calibration gas concentration
closest to the expected concentration in the gas being measured.
Sample Flow Method
Flow is Delivered from
Low Pressure Source
via Flexible Tubing
Direct Flow Method
Flow is Directed to
Flow Orifice on Face
of Flow Adapter Cap
Vent Hole

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To calibrate the Analyzer Span:
1. Move to an area with no wind. Wind can affect the analyzer reading and lead to an
incorrect calibration.
2. Power the unit on and allow it to complete its startup.
3. Hold the Prog button down until the Alarm 1 setting is flashing on the screen.
4. Repeatedly press the On/Off button to cycle through the menu until the screen flashes
“CAL”
5. Using the Program and Adjust buttons, set the Cal number to match the exact
measurement of CO PPM in the calibration gas to be used.
6. Use the Power button to cycle to the home screen.
7. Attach the calibration gas and ensure that gas flow is 1 L/min.
8. Once the display has settled, you can either confirm that calibration is correct, or that a
new calibration must be performed.
9. To calibrate the unit, press and hold the Power and Adjust buttons simultaneously until
the display flashes CAL. The unit will now recalibrate to the gas flow based on the
value input in the CAL programming screen.
10.If the reading drifts after a calibration has been performed, allow the unit to sit for
several minutes while powered on before attempting recalibration.
To calibrate the Analyzer Zero:
1. Power the unit on and allow it to complete its startup.
2. Attach certified 0 PPM 100% Nitrogen calibration gas and ensure that gas flow is 1
L/min.
3. Press the On/Off and Prog buttons simultaneously and hold until the screen flashes
“Cal”
4. When the display returns to reading 000, the zero has been set.
Nuvair offers CO gas testing kits - see addendum for more information
3.1.Sample Flow Method of Checking Calibration (Preferred)
Step 1. Attach
Flexible Tubing
to Gas Sample
Flow of 1 L/min
Step 2. Verify
that Gas is
Flowing Out
Holes in Flow
Adapter Cap
Step 3. Allow 15
Seconds for Display
Reading to Stabilize
Step 4. Record
Reading while Gas is
Flowing

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4.0Operation
Prior to each Analyzer use:
1) Shield the analyzer from wind. Wind can affect the analyzer reading.
2) Turn unit on and monitor Display for low battery warning. Replace battery immediately
if warning appears. Once fully cycled the screen should read “000”
3) Cycle through the current settings of the analyzer.
a. Hold down the Prog button for 2 seconds then use the “Power” button to cycle
through the 1st Alarm Value, 2nd Alarm Value, Full Scale Value, Conversion
Value of the Sensor, Gain Factor, and Calibration value.
b. Adjust Alarm values at this time if needed see “4.2”
4) Check Calibration of Analyzer using “Calibrated Test Gas”
Do not test cylinders suspected of containing carbon monoxide in a confined space
that does not have good ventilation. Exposure to carbon monoxide can lead to
unconsciousness and death.
Gas, even under moderate pressures, can cause extreme bodily harm. Never allow any
gas stream to be directed at any part of your body.
Never expose the sensor to pressures above atmospheric pressure (0 psi) or you may
cause damage to the sensor and/or receive false readings. Damaged Sensors will not
provide accurate gas analysis. Inaccurate gas analysis can lead to serious personal
injury or death.
Low Battery
Indication
Ready For
Gas Analyzing

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The Pro COTM can be used to monitor an enclosed space or to analyze a regulated gas
sample flow, the contents of a gas cylinder, or the flow from a regulator:
•If monitoring an enclosed space, simply remove the Flow Adapter Cap to expose the
Sensor face to the atmosphere and allow the display reading to stabilize.
•If analyzing a gas flow, the Sample Flow Method is the preferred method. The flow rate
must equal .5 to 3 L/min at atmospheric pressure. To produce this flow, a Flow Restrictor
and Regulator may be required. Contact Nuvair if you need assistance.
4.1.Programming Procedures
Keep the Prog button pressed for more than two seconds and then release the button.
“Pr” should display for two seconds and then the display will change to AL 1 and
alternate with the 3 digit set value.
It is possible to program:
oAL 1 First alarm point expressed in ppm of Carbon Monoxide concentration
oAL 2 Second alarm point expressed in ppm of Carbon Monoxide concentration
oFSC Value expressed in ppm of Carbon Monoxide concentration corresponding
to the current output full scale value (20mA). 4mA always correspond to zero
ppm CO concentration.
onA Conversion value of Carbon Monoxide sensor
oFct Gain factor
oCAL CO concentration in the calibration test gas to be used
At the end of the programming procedure the display will show “End” and the
instrument will display the Carbon Monoxide content in the gas mix or “000” if not
attached to a CO gas mix.

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4.2.Alarm Setting (AL 1 & Al 2)
1.) Press the Prog button until the display reads “Pr”, then “AL1”. After a second the
display will show the current value of “AL1” CO PPM setting.
2.) The blinking digit shows the cursor position.
3.) Press the Prog button to increase the value (from 0 to 9)
4.) Press the Adjust button to cycle the cursor through the digits.
5.) To complete your entry and save the CO PPM value, press the On/Off button. You
will then move to the “AL 2” programming view.
6.) Repeat steps 3 through 5 to modify and save the “AL 2” CO PPM desired value.
7.) Once programming of “AL 2” is complete, press the On/Off button repeatedly until
the next desired program page is displayed or the end screen appears.
4.3.Full Scale Value Setting (FSC)
On the “FSC” page you can change the analog full scale value. It is not necessary to
modify this value unless a new sensor is installed. This is the Carbon Monoxide
concentration corresponding to 20 mA on the analog output. 4mA is the value at 0 ppm of
Carbon Monoxide. When installing a new sensor, input the “Fsc” value displayed on the
new sensor here AND in the “Fct” value.
1.) Press and hold the “Prog” button to access the program pages, then release the
button.
2.) Press the On/Off button to cycle through the settings until you reach the “FSC”
view.
3.) The blinking digit shows the cursor position.
4.) Press the Prog button to increase the value (from 0 to 9)
5.) Press the Adjust button to cycle the cursor through the digits.
6.) To complete your entry and save the FSC value, press the On/Off button
repeatedly until the next desired program page is displayed or the end screen
appears.
7.) This procedure is used ONLY when a new sensor has been ordered from
Nuvair and is ready to be installed.

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4.4.Conversion Value of Carbon Monoxide Sensor (nA)
The “nA” value is the conversion value of the Carbon Monoxide sensor in nano Ampere. It
is not necessary to modify this value except when a new sensor is installed. The new
sensor is provided with the new value to be set on this screen.
1.) Press and hold the “Prog” button to access the program pages, then release the
button.
2.) Press the On/Off button to cycle through the settings until you reach the “nA” view.
3.) The blinking digit shows the cursor position.
4.) Press the Prog button to increase the value (from 0 to 9)
5.) Press the Adjust button to cycle the cursor through the digits.
6.) To complete your entry and save the nA value, press the On/Off button repeatedly
until the next desired program page is displayed or the end screen appears.
7.) This procedure is used ONLY when a new sensor has been ordered from
Nuvair and is ready to be installed.
The conversion value of the Carbon Monoxide sensor is set in factory and must be
changed only when the CO sensor is replaced. The new sensor will come from the
factory with a label showing the new “nA” value to be programmed. A wrong value of
this parameter will give a wrong reading of CO concentration. If it is modified the
conversion value of the Carbon Monoxide sensor, the instrument will be no more
accurate. All the analysis concentration shown on the display will be wrong. Do not
modify this value. It is necessary to modify this value only at the installation of a new
sensor. Wrong Carbon Monoxide analysis may lead to death.

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4.5.Gain Factor (Fct)
The “Fct” value is the conversion value of gain factor. It is not necessary to modify this
value except when a new sensor is installed. The new sensor is provided with the new
value to be set on this screen. The value is referred to as the “Fsc” number on the sensor.
1.) Press and hold the Prog button to access the program pages, then release the
button.
2.) Press the On/Off button to cycle through the settings until you reach the “FSC”
view.
3.) The blinking digit shows the cursor position.
4.) Press the Prog button to increase the value (from 0 to 9)
5.) Press the Adjust button to cycle the cursor through the digits.
6.) To complete your entry and save the Gain Factor value, press the On/Off button
repeatedly until the next desired program page is displayed or the end screen
appears.
7.) This procedure is used ONLY when a new sensor has been ordered from
Nuvair and is ready to be installed.
Then gain factor is set in factory and must be changed only when the CO sensor is
replaced. The new sensor will come from the factory with a label showing the new ‘Fct’
value to be programmed. A wrong value of this parameter will give a wrong reading of
CO concentration. If it is modified the gain factor instrument will be no more accurate.
All the analysis concentration shown on the display will be wrong. Do not modify this
value. It is necessary to modify this value only at the installation of a new sensor.
Wrong Carbon Monoxide analysis may lead to death.

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4.6.Calibration Value (CAL)
The “CAL” value corresponds to the CO PPM content of the calibration test gas to be
used for calibration
1.) Press and hold the Prog button to access the program pages, then release the
button.
2.) Press the On/Off button to cycle through the settings until you reach the “CAL” view.
3.) The blinking digit shows the cursor position.
4.) Press the Prog button to increase the value (from 0 to 9)
5.) Press the Adjust button to cycle the cursor through the digits.
To complete your entry and save the Calibration value, press the On/Off button
repeatedly until the next desired program page is displayed or the end screen
appears.
5.0. Threshold Alarms
Should the Carbon Monoxide reading go over the threshold alarms (AL1 or AL2) the
instrument will go into alarm mode and will activate the relays output (open collector
max 100mA) and the internal buzzer. The display will show the trespassed alarm and
the actual measured value. To stop the audible alarm, press any key. In this event the
Pro Co Analyzer will remain in alarm mode until the analyzed value goes below the
alarm set point.
The relay output typically is used to shut down the compressor. Nuvair can supply the
necessary components to adapt your compressor to the relay or provide them at the
time of install on a new compressor.
6.0. Powering Off
At the home or gas reading screen, hold down the On/Off button for a couple of
seconds. The Analyzer will display “OFF” and then go blank.

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7.0. Factory Reset
In case it is necessary to reset the Pro CO Analyzer to the factory settings, power on
the Analyzer pressing at the same time for more than one second the Power and “Cal”
buttons. On the display will appear “res” and the instrument will go to the reading page.
You will need to open the Pro CO analyzer and get the Values from the sensor
for inputting into the PRO CO analyzer before using.
In case of reset, the instrument will delete all the alarms settings, the full scale value,
any new conversion value of Carbon Monoxide sensor and of the gain factory. Before
using again the instrument, it may be necessary to program again the alarm values,
the full scale value, and the conversion value of Carbon Monoxide sensor and gain
factor if changed. All the analysis concentration shown on the display would be wrong.
Wrong Carbon Monoxide analysis may lead to death.
8.0. Maintenance
8.1. Analyzer Care
Analyzers immersed in liquid or stored in wet environments may not operate properly.
This may result in incorrect readings. Incorrect gas analysis may result in personal
injury or death.
Protect the analyzer from excessive shock and impact. Excessive shock and impact
may result in incorrect readings. Incorrect gas analysis may result in personal injury
or death.
Protect the analyzer from exposure to hyperbaric environments. Exposure to
hyperbaric environments may result in incorrect readings. Incorrect gas analysis may
result in personal injury or death.
•Do not clean Analyzer with anything other than a damp soft cloth.
•Do not immerse in liquid, leave unprotected outside, or store in a wet environment.
•Protect Analyzer from excessive shock and impact.
•Protect Analyzer from excessive exposure to sunlight and extreme temperatures.
•Do not use the Analyzer in a hyperbaric environment.

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8.2. 9 V Battery Replacement
Be sure to dispose of spent, leaking, or damaged Battery properly, according to local
regulations.
The following pictures illustrate the steps required to replace the batteries in the Analyzer.
*Contact Nuvair for replacement if the battery life of a Lithium battery should
noticeably degrade.
Step 1. Remove
Screws
Step 2. Remove
Back Cover
Step 3.
Remove &
Replace Old
Battery
Step 5.
Reinstall
Screws
Step 4. Replace
Back Cover -
Do Not Pinch
Wires
Step 6. Turn
Analyzer On
Step 7.
Perform
Calibration

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8.3.Sensor Replacement
You should take note of your “Fsc” Number and “nA” Number before installing a new sensor.
The “Fsc” number is programmed into the Pro CO Analyzer at the “Fct” and “Fsc” setting.
This information will be used to program the Pro CO analyzer after the sensor is installed.
Be sure to dispose of spent, leaking, or damaged Sensors properly, according to local
regulations.
Do not swallow (ingest) either the electrolyte from the Sensor or the Sensor itself. The
Potassium hydroxide chemical contained in the Sensor will cause severe injury or
death. If electrolyte or the Sensor is swallowed, seek medical attention immediately.
If after handling the Analyzer or Sensor, you find that your fingers or other parts of
your body feel “slippery” or the skin or eyes sting, immediately flush affected area
with clean, fresh water for at least 15 minutes. The stinging or slippery sensation is an
indication of a leaking Sensor. The Potassium Hydroxide chemical contained in the
Sensor can cause severe injury or death. Seek immediate medical attention if eye
contact is made or skin stinging persists.
8.2.1 Handling Sensors
Replacement Sensors are supplied in sealed bags. Normally Sensors do not present a health
hazard. Before opening the bag, check that the electrolyte has not leaked. However, if
electrolyte leakage has occurred, do not open bag. Dispose of Sensor properly or return for
replacement.
If electrolyte leakage occurs while the Sensor is in service, use rubber gloves and chemical
splash goggles for handling. Rinse contaminated surfaces thoroughly with water.
Electrolyte First Aid Procedures
•Ingestion - Drink a large volume of fresh water. Do not induce vomiting. Get immediate
medical attention.
•Eye Contact - Flush eyes with clean, fresh water for at least 15 minutes and get
medical help immediately.
•Skin Contact - Flush the affected area with clean, fresh water for at least 15 minutes
and removed contaminated clothing. If stinging persists get medical attention.
“Fsc” Number:
Na Number

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The following pictures illustrate the steps required to replace the Sensor in the Analyzer.
Step 1.
Remove Flow
Adapter Cap
Step 2.
Remove
Screws
Step 3.
Remove
Back
Step 4.
Disconnect
Electrical
Connector
Step 5. Remove
Old Sensor from
Case by
Unscrewing
Step 6. Replace
with New
Sensor
Step 7. Remove
Shorting Plug from
Sensor Electrical
Connector & Reconnect
Step 9.
Reinstall
Screws
Step 8.
Replace
Front Cover
- Do Not
Pinch Wires
Step 10. Replace
Flow Adapter Cap
Step 12. Check
Calibration
Note: Reversing Polarity
Will Cause Display to
Read Negative
Step 11. Turn
Analyzer On

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9.0Spares and Accessories
9.1.Sensors
Sensor replacement for Pro CO
Part Number: 9501-50
9.2.Calibration Equipment
Calibration requires certified CO calibration gas to be
delivered at a specific flow rate and pressure.
A variety of calibration gas canisters are available
from Nuvair, with compatible Flow Restrictor/
Regulator assemblies to regulate the gas.
10.0 Troubleshooting
SYMPTOM REASON SOLUTION
Battery symbol Low Battery Change the battery
No display
Switched off
Bad connection
Low Battery
Switch on, Check display/ battery connection,
Change the battery
Reading erratic
Pressure on sensor
Radio transmission
Sensor old or faulty
Condensation on sensor.
Check flow, Move unit away, Change sensor, Dry in
air
Display segments missing Display faulty Return to dealer
Reading drifts Rapid temperature change Stabilize temperature & recalibrate
Will not calibrate Sensor Malfunction Contact Nuvair for repair or replacement
1L/min Flow
Restrictor/
Regulator
Assembly
10 PPM CO
Calibration Gas
Canister