Nuvair Pro He-O2 User manual

User Manual
Pro He-O2
Helium & Oxygen Gas Analyzer
Rev. 03.19

Pro He-02 Helium & Oxygen Analyzer
NUVAIR Page 2 www.nuvair.com
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 a.m. to 5:00 p.m. 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 equipment damage, injury, or
death.
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 this manual, stop and call Nuvair for information.

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Table of Contents
1.0Introduction
2.0System Description
2.1Controls
2.2Display
2.3Alarm
2.4Sensor
2.5Batteries
3.0Calibration
3.1Sample Flow Method
4.0Operation
5.0Programming
6.0Factory Reset
7.0 Maintenance
7.1Analyzer Care
7.2Battery Replacement
7.3Sensor Replacement
7.4Handling Sensor
8.0Spares and Accessories
8.1Sensors
8.2Calibration Equipment
8.3Charger for 110/230V Analyzer
8.4Flow Restrictors and Regulators
9.0Troubleshooting
Appendix
Analyzer Sensors Specifications
Warranty
Helium and Air Chart

Pro He-02 Helium & Oxygen Analyzer
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1.0Introduction
This manual will assist you in the proper set-up, operation and maintenance of the Pro He-O2
Helium & Oxygen 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.
Warnings Graphics Defined:
Gas Inhalation Skin damage
Abbreviations commonly used in this manual:
psi Pounds Per Square Inch HP High Pressure
LP Low Pressure PPM Parts Per Million
O2Oxygen L/min Liters Per Minute
He Helium O2% Oxygen Percentage of Gas

Pro He-02 Helium & Oxygen Analyzer
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2.0System Description
The Pro He-O2 Helium & Oxygen Analyzer measures Helium (He) and Oxygen (O2) levels in
gasses in the range of 0 to 100% of volume with a .1% resolution. It can be used to measure the
He and O2content in all breathing gas mixes. The Analyzer is designed to verify Helium &
Oxygen concentration in stored gas cylinders, as well as monitor a continuous flow of gas. The
Analyzer is compatible with outdoor and marine environments.
Helium is a colorless, odorless, tasteless gas that will not support life.
Exposure to Helium can lead to unconsciousness and death.
The Analyzer is powered by a rechargeable Lithium
Polymer battery. A 110/230 V charger is supplied with
the unit. Also included are two internally mounted
sensors.
The Analyzer uses a flexible tubing to deliver sample
gas to the Sensors. Pressurized gases must be
regulated to .5-1.0 L/min in order to avoid damage to
the analyzer. Use of this Analyzer in a hyperbaric
chamber will void the owner’s warranty.
Certified calibration gas should be used periodically to
confirm the accuracy of the analyzer and that the
sensor and electronics are working properly.
This analyzer is designed for use at atmospheric pressures only. It is not designed for
exposure 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 has been designed to handle rugged environments, careless
handling or abuse may result in damage to the unit and this may result in inaccurate gas
analysis. Inaccurate gas analysis can lead to serious personal injury or death.
High Pressure Gas directed at the Analyzer may damage the sensors.
The Analyzer is provided in a water-resistant case. However, the electronics inside are
not water resistant. The Lithium Polymer battery can heat up and cause a fire if exposed
to water. Do not allow water to enter the Analyzer case.
Water-
Resistant
Case

Pro He-02 Helium & Oxygen Analyzer
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2.0 Description Continued
Display
AC Adapter
(This is the only charger that is
approved for use with this analyzer)
Gas
Supply
Hose
Charger
Port
Gas Supply Inlet

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2.1. Controls
The Control buttons are referenced throughout the instructions as “On/Off”, “Prog”, and
“Adjust”.
2.2.Display
2.3.Sensors
The Analyzer uses a Thermal Conductive helium sensor to measure He content and an
Electrochemical Oxygen Sensor to measure oxygen content. Only the oxygen sensor is
disposable and user-replaceable. The life expectancy the helium is 24 months and up to 24
months for the oxygen depending on usage. The sensors are 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.
2.4.Battery
The Pro He-O2 Alarm uses a rechargeable lithium polymer battery. Only use the supplied
Nuvair 110/230V charger. A fully charged battery should last up to 24 hours. Recharge takes
about 4 hours. See section 15.3 for complete charging instructions.
DO NOT LEAVE UNIT UNATTENDED WHILE CHARGING and UNPLUG ONCE CHARGED.
Digital
Display
On/Off Button
Adjust Button
Program Button
Gas Reading
0 – 100%
In .1 % increments

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2.5.Flow Tubing
The Analyzer includes a flexible Flow Tubing. It attaches to the gas supply inlet and is used to
direct the gas sample flow to the Sensors.
Flow to the sensor must be restricted to 0.5 – 1.0 L/min. Increased flow will create faulty
readings. Flow restrictors to accomplish this task may be purchased separately. They are
described in the Flow Restrictors and Regulators section.
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 Helium or incorrect
breathing gas mixtures. Exposure to incorrect breathing gas mixtures can lead to
unconsciousness and death.
Calibration must be done using a calibration gas. The calibration gas must be regulated
and supplied at atmospheric pressure (0 psi). Use of gas at higher pressures may result
in incorrect readings and may damage the Analyzer. Incorrect readings may expose the
user to high levels of Helium or Oxygen, 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 exposed to a recent extreme change in ambient temperature,
allow it to stabilize for two minutes before checking calibration.
Verify calibration on a weekly basis. Breathing gas applications require the use of a certified He
calibration gas and flow rate of 0.5 - 1.0 L/min. Certified test gas may be purchased separately.
To assure the greatest accuracy, the calibration gas concentration should be similar to the
expected concentration in the gas being measured.
Sample Flow Method
Flow is delivered from
Low Pressure Source
via Flexible Tubing

Pro He-02 Helium & Oxygen Analyzer
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3.1.Sample Flow Method of Checking Calibration (Preferred):
(Ensure that the Sample Flow Tube is disconnected and Analyzer Displays are stabilized before beginning)
1. Remove the Sample Flow Tubing from the Gas Supply Inlet.
2. Program the O2 Calibration Point (cPt) the Oxygen percent of the Calibration Gas, then return to the
home screen and select the gas to be checked.
3. Attach Sample Flow Tubing to the calibration gas, regulated to 0.5-1.0 L/min. Allow gas to flow until
the reading is stable
4. To calibrate the O2 analyzer, press the On/Off and Adjust keys until the screen shows “CAL”.
5. If the Helium analyzer is reading greater than 2% difference from the calibration gas content,
contact Nuvair for repair or replacement.
Certified test gas (P/N 101618) for confirming calibration can be purchased separately.
See Spares and Accessories section.
Testing Gas must contain a known amount of Helium for calibration test to succeed.
Do NOT use a gas mix containing Acetylene, Ammonia, Argon, CO2, Ethane, Ethylene, Freon, Hydrogen,
Methane, Neon, Propane, etc.
Step 2: Attach
Flexible Tubing to
Gas Sample Flow
of 0.5 – 2.0
L/min.
Step 3: Verify that
Gas is flowing
through Sample Flow
Tube, and then
attach hose to Gas
Supply Inlet
Step 4: Allow Display
Reading to Stabilize
Step 5: Record Reading
While Gas is Flowing
Flow Restrictor/
Regulator
Assembly
P/N P101618
Nuvair Calibration
Gas Specs:
18% O2
50% He
32 % N (Nitrogen)
Step 1: Remove
Sample Flow Tube
from Gas Supply
Inlet.

Pro He-02 Helium & Oxygen Analyzer
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4.0Operation
1) Turn Pro He O2 on by holding the “On/Off” button for more than 3 seconds, until display
shows “On”. The unit will then display the current firmware version, and then the current
selected analyzer, alternating with the gaslevel sensed by the analyzer sensor.
2) Cycle through the current settings of the analyzer:
A. Cycle between the O2 and He analyzers by pushing and quickly releasing
the On/Off Button
B. Hold down the “Prog” button for 2 seconds then use the “On/Off” button to cycle
through the settings.
C. Adjust program values at this time if needed.
3) Confirm calibration of Analyzer using “Calibration Test Gas” once weekly.
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.
The Pro He-O2 Alarm can be used to analyze a regulated gas sample flow, the contents of a
gas cylinder, or the flow from a regulator:
•When analyzing a gas, the flow rate must equal 0.5 – 1.0 L/min at atmospheric pressure (0
psi). To produce this flow, a flow restrictor and/or regulator may be required. Contact Nuvair
if you need assistance.

Pro He-02 Helium & Oxygen Analyzer
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5.0 Overview of Programming Procedures
To enter the programming page, turn on the unit, then hold the Prog button until the
screen shows “Pr”.
Cycle through the programmable features by pressing the On/Off Button. The display will
show “End” and return to the analyzer value of the currently analyzed gas after cycling through
the programmable features.
•The O2 analyzer Calibration Value (display will show “02c” or “cPt”) is the Oxygen percent of
the gas used for calibration.
oPress the Prog button to increase the value of the selected digit
oPress the Adj button to change the selected digit
•The Time On (display will show “t0n” or “t00”) setting adjusts how long the analyzer will stay
on in seconds before automatically shutting down.
oPress the Prog button to increase the value of the selected digit
oPress the Adj button to change the selected digit
6.0Factory Reset
If it becomes necessary to reset the Pro O2Analyzer to the factory settings, first power on
the Analyzer the pressing the “On/Off” and “Adjust” buttons at the same time and hold
them for a few seconds. On the display will appear “res” and the instrument will go to the
reading page.
After reset, the instrument will delete all the alarms settings and any customization to the
full scale value, and the Oxygen calibration will be lost, as the unit will be reset to factory
settings. Before using the instrument, it will be necessary to reprogram the alarm values,
the full scale value, and the Oxygen sensor calibration to the desired settings. Proper
calibration should be achieved prior to using analyzer. Wrong Oxygen analysis may lead
to death.

Pro He-02 Helium & Oxygen Analyzer
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7.0Maintenance
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. The Lithium Polymer battery may present a fire hazard if the battery gets
wet.
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.
7.1. Analyzer Care
•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.

Pro He-02 Helium & Oxygen Analyzer
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7.2.Battery Replacement
Be sure to dispose of spent or damaged Battery properly and according to local
regulations.
The following instructions show the steps necessary to replace the Lithium Polymer battery used
to power the Pro He-O2 Alarm analyzer:
Remove four nuts and pull out aluminum panel. The Lithium Polymer battery is under this panel.
Contact Nuvair for a replacement battery.
Replace sensor when either the Helium or Oxygen analyzer is unable to correctly analyze
Supply gas. The use of an exhausted sensor may cause incorrect gas analysis. Incorrect
gas analysis may lead to death. Contact NUVAIR for sensor replacement parts. Do not
use any other sensor brands for replacement. Unauthorized sensors may not work
properly in this analyzer and use of them will void all warranties.
Step 1:
Remove four
Nuts and
washers
Step 2: Rotate
Analyzer Cover
upside down with
hand on panel
Step 3: Remove &
Replace Old Battery
Step 5:
Reinstall Nuts
and washers
Step 4: Replace
Analyzer Cover -
Do Not Pinch Wires
Step 7: Turn
Analyzer On
Step 8:
Perform
Calibration Test
Battery is held in
place by Velcro
Step 6: Charge
battery
Disconnect Battery

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7.3. Sensor Replacement
Take care not to damage the Oxygen sensor when replacing. Unplug and unscrew the
sensor from the threaded port the sensor is mounted in.
The Helium sensor is not user replaceable.
Be sure to dispose of spent or damaged Sensors properly, according to local regulations
for solid state electronics.
7.4.Handling Sensors
Replacement Sensors are supplied in sealed bags. Normally Sensors do not present a health
hazard. Dispose of Sensor properly or return for replacement. Sensors are made using Solid
State technology and should be handled like similar electronics according to local regulations.
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.
Do not try to disassemble the sensor. Sealed unit contains caustic liquid
(KOH) which may cause severe burns to skin and eyes. In case of contact,
flush 15 minutes with water. For contact to eyes flush immediately with
water and seek medical attention. If not properly treated, the eyes may have
permanent damage.
Oxygen Sensor
P/N 9507

Pro He-02 Helium & Oxygen Analyzer
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8.0Spares and Accessories
8.1.Sensors
The replacement O2 sensor is P/N 9507.
Contact Nuvair for replacement of the He sensor
8.2.Calibration Equipment
Calibration check requires certified He 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.
Do NOT use a gas mix containing Acetylene,
Ammonia, Argon, CO2, Ethane, Ethylene, Freon,
Hydrogen, Methane, Neon, Propane, etc.
8.3.Authorized 110/230V Charger
VERY IMPORTANT: USE ONLY NUVAIR SUPPLIED MODEL: H00740003-XX-W1. USE Of
ANY OTHER CHARGER COULD CAUSE A FIRE AND VOIDS WARRANTY.
Features:
•110V-240V AC input for worldwide power support
•Constant charging current for faster charging
•Stabilized output, low ripple
•Safety Protection:
•Over Voltage Protection
•Short Circuit Protection
•Output reverse input protection
•The charger will cut off automatically if battery is
fully charged (1/10C) and indicated by LED
In charging mode RED LED
Battery Full GREEN LED
WARNING:
•Charge only Nuvair 7.4V Li-ion rechargeable battery pack with this charger
•Don’t expose the product to rain or humidity to prevent from electric shock
•It is normal for the product to get slightly warm when in use
•Keep out of reach of children
•Don’t touch any part of the product during charging to prevent electric shock.
Flow Restrictor/
Regulator
Assembly
Oxygen Sensor
P/N 9507
Specifications:
Input: AC 100-240V 50-60Hz
Output: DC 8.1V
Charging Current: 300mA
P/N P101618
Nuvair Calibration
Gas Specs:
18% O2
50% He
32 % N (Nitrogen)

Pro He-02 Helium & Oxygen Analyzer
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8.4.Flow Restrictors and Regulators
A variety of Flow Restrictors and Pressure Regulators
for the Sample Flow Method are available from Nuvair,
all calibrated to produce a flow rate of 0.5 – 2.0 L/min
with a Regulator output of 100 – 160 psi.
Universal Flow Restrictors are used for most
applications and are typically provided complete with
Regulator.
When analyzing Scuba Cylinder gases, special Flow
Restrictors can be used to obtain the sample gas
directly from the BC inflator hose. A variety of BC
Flow Restrictors are available to fit the different types
of inflator hose QD fittings used.
9.0Troubleshooting
SYMPTOM REASON SOLUTION
Battery symbol Low Battery Charge the battery
No display
Switched off
Bad connection
Low Battery
Switch on
Check display/ battery connection
Charge 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
Pressure
Reducing
Regulator
Standard Flow Restrictor
Part - 9518-STD
MaresTM Flow Restrictor
Part – 9518-MARES
ScubaProTM Flow Restrictor
Part – 9518-SCUBAPRO
HP Regulated Flow Restrictor
Part No. 9520-Int
Universal
Flow
Restrictor
¼” FNPT Flow Restrictor
Part - 9518
Part No. 9519
HP Regulated Flow Restrictor
Part No. 9520-DIN

Pro He-02 Helium & Oxygen Analyzer
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Appendix
Analyzer Specifications Helium Sensor (P/N 9511)
Resolution: 0 – 100% Helium in air or nitrogen or oxygen
Display Accuracy: +/- 2%
Sensor Type: Thermal Conductive Technology
Expected Sensor Life, Room Air: 5+ Years
Power: Rechargeable Lithium Ion Battery 110/230v electric
Response Time: Less than 10 Seconds to 90% of Final Value
Stabilization Time: 10 Minutes Max Accuracy
Operating Temperature: 41 to 86°F (5 to 30°C). Will work outside this range with
decreased accuracy.
Storage Temperature: 5 to 104°F (-15 to 40°C)
Operating Pressure: Not to Exceed 1 Atmosphere Absolute (0 psi)
Humidity: 0-95% Non-Condensing.
Don’t allow moisture to build up on the sensing surface.
Warranty: 12 Months
Note: All specifications are at ambient / sea level, 77°F / 25°C and subject to change without notice
Analyzer Specifications Oxygen Sensor (P/N 9507)
Sensor Type: Electrochemical (Galvanic)
Electrical Connector: 3.5 mm Molex Jack
Range: 0-100.0% Oxygen (0-1 ATA PPO2)
Display Accuracy: +/- 0.1%
Expected Sensor Life, Room Air: 0-24 Months @ ambient air
Output Signal: 11+- 3 milliVolt @ dry ambient air 74°F (23°c)
Power: Rechargeable Lithium Ion Battery 110/230v electric
Response Time: Less Than 12 Seconds
Drift: < 1% volume O2 / month @ air
Operating Temperature: 41-104°F (5-40°C)
Storage Temperature: recommended: 41to 86°F (5 to 30°C)
maximum: -4 to122°F (-20 to 50°C)
Pressure: 750 to 1250 hPa
Linearity Error: = 2% @ 100% O2applied for 5 min.
Zero Offset Voltage: = 200 uV in 100% N2, applied for 5 min.
Influence of Humidity: -0.03% rel. O2reading /%RH
Humidity: up to 100% RH
Temperature Compensation: NTC
Interferences: according to DIN EN 12598 and ISO 7767
Material in contact media: PA, PPS, PTFE, stainless steel
Warranty: 24 Months Prorated
In the interest of product improvement these design specifications may change without notice.
Note: All specifications are at ambient / sea level, 77°F / 25°C.

Pro He-02 Helium & Oxygen Analyzer
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NUVAIR Pro He-O2 Oxygen Sensor Warranty
Nuvair extends a limited warranty, which warrants the Pro He-O2 to be free from defects in materials and
workmanship under normal use and service for a one year with the exception of the Oxygen
Sensor. The Pro He-02 Oxygen Sensor is under warranty according to the pro-rated terms as set forth
below. This warranty is non-transferable.
Nuvair will, at its discretion and according to the terms as set forth within, replace or repair any materials
which fail under normal use and service and do not exhibit any signs of improper maintenance, misuse,
accident, alteration, weather damage, tampering, or use for any other than the intended
purpose. Determination of failure is the responsibility of Nuvair, which will work together with the
customer to adequately address warranty issues. When any materials are repaired or replaced during
the warranty period, they are warranted only for the remainder of the original warranty period. This
warranty shall be void and Nuvair shall have no responsibility to repair or replace damaged materials
resulting directly or indirectly from the use of repair or replacement parts not approved by Nuvair.
Pro-Rated Terms:
NUVAIR warrants the O2sensor to be free from defects in material and workmanship for a period of
twenty-four (24) months from date of purchase. The warranty covers parts and labor and is prorated as
follows:
•0 – 12 Months Free Replacement
•13 – 18 Months 50% Off Replacement
•19 – 24 Months 25% Off Replacement
A warranty registration card, supplied with system documentation, must be filled out and submitted to
Nuvair for the warranty to be registered. If the warranty registration card is not received within ten (10)
days of purchase, the warranty will begin with the date of manufacture by Nuvair.
Maintenance Items:
Any materials which are consumed, or otherwise rendered not warrantable due to processes applied to
them, are considered expendable and are not covered under the terms of this policy.
Return Policy:
Application for warranty service can be made by contacting Nuvair during regular business hours and
requesting a Return Material Authorization number. Materials that are found to be defective must be
shipped, freight pre-paid, to the Nuvair office in Oxnard, California. Upon inspection and determination of
failure, Nuvair shall exercise its options under the terms of this policy. Warranty serviced materials will
be returned to the customer via Nuvair’s preferred shipping method, at Nuvair’s expense. Any expedited
return shipping arrangements to be made at customer’s expense must be specified in advance.
Limitation of Warranty and Liability:
Repair, replacement or refund in the manner and within the time provided shall constitute Nuvair’s sole
liability and the Purchaser’s exclusive remedy resulting from any nonconformity or defect. Nuvair shall
not in any event be liable for any damages, whether based on contract, warranty, negligence, strict
liability or otherwise, including without limitation any consequential, incidental or special damages, arising
with respect to the equipment or its failure to operate, even if Nuvair has been advised of the possibility
thereof. Nuvair makes no other warranty or representation of any kind, except that of title, and all other
warranties, express or implied, including warranties of merchantability and fitness for a particular purpose,
are hereby expressly disclaimed. No salesman or other representative of Nuvair has authority to make
any warranties.

Pro He-02 Helium & Oxygen Analyzer
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Nuvair Pro HE-O2 Helium Sensor Warranty
Nuvair extends a limited warranty, which warrants the Pro HE to be free from defects in materials and
workmanship under normal use and service for a limited period. The Pro He is warranted according to
the terms as set forth below. This warranty is not transferable.
Nuvair will, at its discretion and according to the terms as set forth within, replace or repair any materials
which fail under normal use and service and do not exhibit any signs of improper maintenance, misuse,
accident, alteration, weather damage, tampering, or use for any other than the intended purpose.
Determination of failure is the responsibility of Nuvair, which will work together with the customer to
adequately address warranty issues. When any materials are repaired or replaced during the warranty
period, they are warranted only for the remainder of the original warranty period. This warranty shall be
void and Nuvair shall have no responsibility to repair or replace damaged materials resulting directly or
indirectly from the use of repair or replacement parts not approved by Nuvair.
Terms:
Nuvair warrants the Pro He to be free from defects in material and workmanship for a period of twelve
(12) months from date of purchase. The warranty covers parts and labor.
A warranty registration card, supplied with system documentation, must be filled out and submitted to
Nuvair for the warranty to be registered. If the warranty registration card is not received within ten (10)
days of purchase, the warranty will begin with the date of manufacture by Nuvair.
Maintenance Items:
Any materials which are consumed, or otherwise rendered not warrantable due to processes applied to
them, are considered expendable and are not covered under the terms of this policy. This includes
batteries.
Return Policy:
Application for warranty service can be made by contacting Nuvair during regular business hours and
requesting a Return Material Authorization number. Materials that are found to be defective must be
shipped, freight pre-paid, to the Nuvair office in Oxnard, California. Upon inspection and determination of
failure, Nuvair shall exercise its options under the terms of this policy. Warranty serviced materials will be
returned to the customer via Nuvair’s preferred shipping method, at Nuvair’s expense. Any expedited
return shipping arrangements to be made at customer’s expense must be specified in advance.
Limitation of Warranty and Liability:
Repair, replacement or refund in the manner and within the time provided shall constitute Nuvair’s sole
liability and the Purchaser’s exclusive remedy resulting from any nonconformity or defect. Nuvair shall
not in any event be liable for any damages, whether based on contract, warranty, negligence, strict
liability or otherwise, including without limitation any consequential, incidental or special damages, arising
with respect to the equipment or its failure to operate, even if Nuvair has been advised of the possibility
thereof. Nuvair makes no other warranty or representation of any kind, except that of title, and all other
warranties, express or implied, including warranties of merchantability and fitness for a particular
purpose, are hereby expressly disclaimed. No salesman or other representative of Nuvair has authority
to make any warranties.

Pro He-02 Helium & Oxygen Analyzer
NUVAIR Page 20 www.nuvair.com
Helium and Oxygen Sample Test Chart
The Helium and Air chart contains a set of numbers for validating that Pro He-O2 Alarm
analyzer is working properly. The concept behind using the chart is that the user has a high and
low Helium test gas available. We recommend: 90% Helium (balance Nitrogen), 10% Helium
(balance Nitrogen), and certified breathing air 20.9% Oxygen. These gases should be contained
in portable storage bottles with regulators and flow restrictors for delivery to the Analyzer. Gas
delivery needs to be regulated down to 0.5 -2.0 liters per minute using flow restrictors.
In this procedure the Oxygen Analyzer is first calibrated with breathing air gas flowing to the
Analyzer.
The second step is to connect the 10% Helium Gas to the Analyzer. Open the gas and allow the
Analyzer to stabilize.
Note the Oxygen and Helium readings at this time. Using the chart look up the Helium Gas
being used and confirm the Oxygen reading matches within 1 to 2% of the number stated on the
chart.
Repeat the process with the 90% Helium gas and confirm the Oxygen percentage is within 1 to
2% of the Chart reading.
We recommend a High and Low Helium mix for doing this test and have provided this chart so
that you can confirm proper analysis is being recorded by the analyzer.
It is very important that the Oxygen Analyzer is turned on and calibrated first to verify the
analyzer is reading the correct content of Oxygen. This will help ensure the Helium test is
accurate.
The Helium test gas should only contain Helium and Nitrogen. No other gases should be
present in the mix.
If the Analyzer does not measure the Helium and Oxygen properly, we recommend you
recalibrate the Oxygen Analyzer and do the test over again. If the Analyzer fails the test again,
Contact Nuvair customer service to discuss the return of the Analyzer for testing and possible
repair.