Maxtec Handi+ N2 User manual

R218M06 REV. G
Handi+ N2
N
2
Instructions for Use

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CLASSIFICATION:
Protection against electric shock.................................................... Internally powered equipment
Protection against water...............................................................................................................IPX4
Mode of Operation .............................................................................................................Continuous
Flammable anesthetic mixture .....................................................Not suitable for use in presence
of a flammable anesthetic mixture.
Product Disposal Instructions:
The sensor, batteries, and circuit board are not suitable for regular trash dis-
posal. Return sensor to Maxtec for proper disposal or dispose according to local
guidelines. Follow local guidelines for disposal of other components.
WARRANTY
The N2 analyzer is designed for oxygen delivery equipment and systems. Under normal
operating conditions, we warrant the N2 analyzer to be free from defects of workmanship or
materials for a period of 2- years from the date of shipment provided that the unit is properly
operated and maintained in accordance with our operating instructions. Based on our product
evaluation our sole obligation under the foregoing warranty is limited to making replace-
ments, repairs, or issuing credit for equipment found to be defective. This warranty extends
only to the buyer purchasing the equipment directly from us or through our designated dis-
tributors and agents as new equipment. Our warrants the oxygen sensor in the N2 analyzer
to be free from defects in material and workmanship for a period of 2-years from the date of
shipment in a N2 analyzer. Should a sensor fail prematurely, the replacement sensor is war-
ranted for the remainder of the original sensor warranty period. Routine maintenance items,
such as batteries, are excluded from warranty. We and any other subsidiaries shall not be liable
to the purchaser or other persons for incidental or consequential damages or equipment that
has been subject to abuse, misuse, misapplication, alteration, negligence or accident. THESE
WARRANTIES ARE EXCLUSIVE AND IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED,
INCLUDING WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
WARNINGS
Indicates a potentially hazardous situation, if not avoided, could result in death or serious injury.
◆ Never allow an excess length of tubing, or any accessory near a person’s head or neck, which
may result in strangulation.
◆ Before use, all individuals who will be using the N2 Analyzer must become thoroughly famil-
iar with the information contained in this Operation Guide.
◆ Strict adherence to the operating instructions is necessary for safe, effective product perfor-
mance. This product will perform only as designed if installed and operated in accordance
with the manufacturer’s operating instructions.
◆ Use only genuine accessories and replacement parts. Failure to do so may seriously impair
the analyzer’s performance.
◆ Repair or alteration of the N2 Analyzer beyond the scope of the maintenance instructions,
or by anyone other than an authorized service person, could cause the product to fail to
perform as designed.
◆ Calibrate the N2 analyzer weekly when in operation, or if environmental conditions change
significantly. (ie, Elevation, Temperature, Pressure, Humidity — refer to “Factors Influencing
Accurate Readings”).
◆ Use of the N2 analyzer near devices that generate electrical fields may cause erratic readings
◆ Ensure proper tire inflation pressure after use, if required.
◆ The oxygen sensor is a sealed device containing a mild acid electrolyte, lead (Pb), and lead
acetate. Lead and lead acetate are hazardous waste constituents and should be disposed of
properly, or returned for proper disposal or recovery.
◆ Dropping the device can adversely affect its performance.
DO NOT immerse the device in any cleaning solution, autoclave or expose the sensor to
high temperatures (> 70°C).
DO NOT over pressurize the sensor. Doing so may destroy the sensor and void the war-
ranty. To avoid over pressurization only allow 3 psi (or 2 liters per minute) of gas to come
in contact with the sensor membrane.
CAUTION
Indicates a potentially hazardous situation, if not avoided, could result in minor or moderate
injury and property damage.
◆ Read the manual in its entirety before attempting use.
◆ Always use protective eyewear and observe proper safety procedures when working with
pressurized gases.
◆ Dispose of the N2 properly when it has expired.
◆ Ensure the protective freshness seal has been removed from the sensing port before use.
◆ Ensure the N2 has been properly calibrated before use.
◆ If the N2 display goes blank immediately after the on button is pushed, or the N2 will not
properly calibrate, the unit has expired.
DO NOT use, dispose of properly.
◆ The display is not valid when in Over Range Mode. Recalibrate the N2 and observe the proper
operating procedure.
◆ Never immerse the N2 or expose it to high humidity or moisture. It is not watertight.
◆ Never expose the N2 to high temperatures.
SYMBOL GUIDE
The following symbols and safety labels are found on the Handi+:
ON/OFF Key CAL (Calibration Key
Do not throw away. Follow
local guidelines for disposal
Attention, consult
accompanying documents
Serial Number Catalog Number
Corrosive Lot code/Batch code
DO NOT Meets ETL standards
Contains Lead Manufacturer
Caution Warning
IPX4 Ingress Protection Rating
Maxtec
2305 South 1070 West
Salt Lake City, Utah 84119
USA
phone: [phone]
fax: [phone]
email: [e-mail]
web: www.maxtec.com
NOTE: The latest edition of this operating manual can be downloaded from our website at www.maxtec.com

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1.0 INTRODUCTION
This manual describes the function; operation and maintenance of the N2 Analyzer. The intent
of this manual is to describe the function of the N2 Analyzer only. The final assembly manu-
facturer should provide operating instructions for the completed assembly. The N2 analyzer is
engineered for long life, maximum reliability and stable performance.
NOTE: In order to obtain optimum performance from your analyzer, all operation and mainte-
nance must be performed in accordance with this manual. Please read the manual thoroughly
before using the analyzer and do not attempt any repair or procedure that is not described
herein. We cannot warranty any damage resulting from misuse, unauthorized repair or
improper maintenance of the instrument.
2.0 COMPONENT IDENTIFICATION
LCD DISPLAY: A 3-digit display provides a direct readout of nitrogen concentration in the range
of 0 - 99.9%. The display is blank when the N2 Analyzer enters its sleep (power off) mode. The
N2 Analyzer will automatically enter the sleep mode after 2 minutes from the last time the unit
was energized. You can manually turn off the analyzer by pressing the on/off switch.
ON BUTTON/AUTO OFF: Use this button to turn the N2 Analyzer on or off. When the N2 Analyzer
is in the Sleep (power off) mode, the LCD display is blank. When the ON button is pressed once,
the analyzer will display the nitrogen concentration for 2 minutes. Pressing the ON button
during this 2 minute "window" will prolong the ON period to 2 minutes from the most recent
time that the button was pushed.
OVER RANGE INDICATOR: The appearance of a decimal point after the first digit means that the
N2 Analyzer is reading in excess of 99.9%.
Example: 0.0.0 = 100% 0.0.1 = 101%
0.0.2 = 102% (etc).
CALIBRATION KEY: This key is used to calibrate the device. Holding the key for more than three
seconds will force the device to enter a calibration mode.
OXYGEN SENSOR: This is used to measure oxygen concentration in sample gas.
SAMPLE INLET CONNECTION: This is the port at which the device is connected to determine
nitrogen concentration.
3.0 PRE-USE CHECKOUT/
CALIBRATION
Follow these steps before using the N2 Analyzer
1. Prior to turning on the unit, a protective film covering the threaded sensor face
must be removed. After removing the film, wait approximately 20 minutes for the
sensor to reach equilibrium.
2. Pre-assembly, if required.
•Thread the barbed adapter onto the oxygen sensor.
•Connect the clear tubing to the barbed adapter.
3. Using the "ON/OFF" key , make sure the unit is in the power "ON” mode.
4. Press and hold the Calibration Key for 3 seconds until the display reads
“CAL”. This will calibrate the N2 Analyzer to room air. Thereafter, we recommend
calibration on a weekly basis
A new calibration is required when:
•The measured N2 percentage in 79.1% N2 is above 80.1% N2
•The measured N2 percentage in 79.1% N2 is below 78.1% N2
•If you are unsure about the displayed N2 percentage. (see Factors influencing
accurate readings.)
5. The N2 Analyzer is ready to use.
4.0 OPERATION PRINCIPALS
The instrument display corresponds directly to the oxygen sensor. The oxygen diffuses
through the membrane and an electrical current is generated that is proportional to the partial
pressure of oxygen in the gas sample. The oxygen percentage is subtracted from 100, with the
remainder being displayed as percent nitrogen. The sensor has a minimal response to gases
other than oxygen.
5.0 FACTORS INFLUENCING
ACCURATE READINGS
5.1 Elevation Changes
•Changes in elevation result in a reading error of approximately 1% of reading per
250 feet.
•In general, calibration of the instrument should be performed when elevation at
which the product is being used changes by more than 500 feet.
5.2 Temperature Effects
The N2 analyzer will hold calibration and read correctly within ±3% when in thermal equi-
librium within the operating temperature range. The device must be thermally stable when
calibrated and allowed to thermally stabilize after experiencing temperature changes before
readings are accurate.
•For best results, perform the calibration procedure at a temperature close to the
temperature where analysis will occur.
•Allow adequate time for the sensor to equilibrate to a new ambient temperature.
CAUTION: “CAL Err St” may result from a sensor that has not reached thermal equilibrium.
5.3 Pressure Effects
Readings from the N2 analyzer are proportional to the partial pressure of oxygen. The partial
pressure is equal to the concentration times the absolute pressure. Thus, the readings are
proportional to the concentration if the pressure is held constant. Therefore, the following are
recommended:
•Calibrate the N2 analyzer at the same pressure as the sample gas.
•If sample gases flow through tubing, use the same apparatus and flow rates when
calibrating as when measuring.
•The N2 analyzer oxygen sensor has been tested at pressures up to two
atmospheres absolute. Calibration or operation above this pressure is beyond the
intended use.
5.4 Humidity Effects
Humidity (non-condensing) has no effect on the performance of the N2 analyzer other than
diluting the gas, as long as there is no condensation. Depending on the humidity, the gas
may be diluted by as much as 4%, which proportionally reduces the oxygen concentration.
The device responds to the actual oxygen concentration rather than the dry concentration.
Environments where condensation may occur are to be avoided since moisture may obstruct
passage of gas to the sensing surface, resulting in erroneous readings and slower response
time. For this reason, the following is recommended:
•Avoid usage in environments greater than 95% relative humidity.

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6.0 CALIBRATION ERRORS AND
ERROR CODES
The N2 analyzers have a self test feature built into the software to detect faulty calibrations,
oxygen sensor failures, and low operating voltage. These are listed below, and include pos-
sible actions to take, if an error code occurs.
E03: No valid calibration data available
Make sure unit has reached thermal equilibrium. Press and hold the Calibration Button for
three seconds to manually force a new calibration.
E04: Battery below minimum operating voltage
Unit is at end of life, see page I for proper disposal.
CAL Err St: O2 Sensor reading not stable
Wait for displayed oxygen reading to stabilize when calibrating the device at 100% oxygen.
Wait for unit to reach thermal equilibrium (Please note that this can take up to one half hour,
if the device is stored in temperatures outside the specified operating temperature range).
CAL Err lo: Sensor voltage too low
Press and hold the Calibration Button for three seconds to manually force a new calibra-
tion. If unit repeats this error more than three times, contact Maxtec Customer Service for
possible sensor replacement.
CAL Err hi: Sensor voltage too high
Press and hold the Calibration Button for three seconds to manually force a new calibra-
tion. If unit repeats this error more than three times, contact Maxtec Customer Service for
possible sensor replacement.
CAL Err Bat: Battery voltage too low to recalibrate
Unit is at end of life, see page I for proper disposal.
7.0 CLEANING, MAINTENANCE, AND
DISPOSAL
Store the N2 analyzer in a temperature similar to its ambient environment of daily use. The
instructions given below describes the methods to clean the instrument, sensor and its
accessories:
7.1 Instrument
•When cleaning or disinfecting the exterior of the N2 analyzer, take appropriate
care to prevent any solution from entering the instrument.
DO NOT immerse unit in fluids.
7. 2 Oxygen Sensor
•Clean the sensor with a cloth moistened with a 65% alcohol / water solution.
•We do not recommend use of spray disinfectants because they can contain salt,
which can accumulate in the sensor membrane and impair readings.
DO NOT throw away. Dispose of properly in accordance with local regulations.
7.3 Accessory
•The threaded barbed adapter may be cleaned by washing it with a 65% alcohol/
water solution. The part must be thoroughly dry before it is re-used.
8.0 SPECIFICATIONS
Sensor Type:.............................................................................................................. Galvanic fuel cell
Measurement Range:..............................................................................................0-99.9% Nitrogen
Resolution/Display:........................................................................................................................0.1%
The three digit LCD indicates values between 0.0 - 99.9% oxygen.
Over range indicated by one decimal point on display located after the first digit.
Accuracy and Linearity: ................................± 1% of full scale at constant temperature, R.H. and
@ 15˚C - 40˚C pressure when calibrated at full scale.
± 3% actual oxygen level over full operating temperature.
Response Time: ..........................................................< 15 seconds for 90% step change. (at 25˚C)
Warm-up Time:.............................................................................................................None required
Operating Temperature:...........................................................................15˚C - 40˚C (59˚F - 104˚F)
Storage Temperature:................................................................................-15˚C - 50˚C (5˚F - 122˚F)
Operating Pressure: .........................................................................Atmospheric pressure to 3psig.
Environmental:.....................................................General purpose housing equivalent to NEMA 1.
The Handi+ is not waterproof. 0-95% RH, non-condensing.
Warranty:....................................................Twenty-four months in normal operating conditions.
Power Requirements:................................................................................Powered by one internal,
non-replaceable Lithium battery, CR2450.
Power on push button automatically shuts off after 80 seconds time-out.
Electronics rated general purpose;
not for use in hazardous areas or for use with flammable gases.
Weight:......................................................................................................................Approx. 3 Ounces
Battery Life:................................................................................Approx. 1850 hours (74,000 cycles)
Sample Port:.................................................................M16 x1 Thread with barbed tubing adapter.
Operating Pressure: ........................................................................Atmospheric pressure to 3 psig
Expected Storage Life :............................................... Two months with freshness seal on sensor.
2305 South 1070 West
Salt Lake City, Utah 84119
[phone]
www.maxtec.com