Maxtec R217P65 User manual

Nitrogen Analyzer
OPERATING MANUAL &
INSTRUCTIONS FOR USE
R217P65, R217P66, R217P67
R217M65 Rev. G

bWWW.MAXTEC.COM

iWWW.MAXTEC.COM
EC REP QNET BV
Hommerterweg 286
6436 AM Amstenrade
The Netherlands
Maxtec TEL [phone]
2305 South 1070 West FAX [phone]
Salt Lake City, UT 84119 e-mail: [email protected]
Web-Site: www.maxtec.com
Authorized Representative:
CLASSIFICATION
Protection against electric shock: Internally powered equipment.
Protection against water: IPX1
Mode of Operation: Continuous
Do not throw away. Dispose of properly in accordance with local regulations.
WARRANTY
The N2analyzer is designed for nitrogen delivery equipment and systems. Under normal operating
conditions, Maxtec warrants the N2analyzer to be free from defects of workmanship or materials
for a period of 2-years from the date of shipment from Maxtec, provided that the unit is properly
operated and maintained in accordance with Maxtec’s operating instructions. Based on Maxtec’s
product evaluation, Maxtec's sole obligation under the foregoing warranty is limited to making
replacements, repairs, or issuing credit for equipment found to be defective. This warranty extends
only to the buyer purchasing the equipment directly. Maxtec's sole obligation under the foregoing
warranty is limited to making replacements, repairs, or issuing credit for equipment found to be
defective. This warranty extends only to the buyer purchasing the equipment directly from Maxtec
through Maxtec's designed distributors and agents as new equipment.
Maxtec warrants the oxygen sensor in the N2analyzer to be free from defects in material and
workmanship for a period of 2-years for Nitrogen A & AE and 1-year for Nitrogen A Fast from
Maxtec's date of shipment in a N2analyzer. Should a sensor fail prematurely, the replacement
sensor is warranted for the remainder of the original sensor warranty period.
Routine maintenance items, such as batteries, are excluded from warranty. Maxtec 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, mis-application, alteration,
negligence or accident.
These warranties are exclusive and in lieu of all other warranties, expressed or implied,
including warranty of merchantability and tness for a particular purpose.

ii WWW.MAXTEC.COM
PREFACE
This manual describes the function, operation and maintenance of the
N2analyzer hand-held and panel mount nitrogen analyzers. The Maxtec
N2analyzer is engineered for long life, maximum reliability and stable
performance.
NOTE: In order to obtain optimum performance from your analyzer,
all operation and maintenance 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. Maxtec cannot warrant any damage resulting
from misuse, unauthorized repair or improper maintenance of the
instrument.
WARNING:
Never allow an excess length of tubing, lanyard, or sensor cable near a
person’s head or neck, which may result in strangulation.
Before use, all individuals who will be using the N2analyzer must become
thoroughly familiar with the information contained in this Operation Manual.
Strict adherence to the operating instructions is necessary for safe, effective
product performance. This product will perform only as designed if installed
and operated in accordance with the manufacturer’s operating instructions.
Use only genuine Maxtec accessories and replacement parts. Failure to do
so may seriously impair the analyzer’s performance. Repair of this equipment
must be performed by a qualied serice technician experienced in repair of
portable hand held medical equipment.
Calibrate the N2analyzer weekly when in operation, or if environmental
conditions change signicantly. (ie. Elevation, Temperature, Pressure,
Humidity — refer to Section 3.0 of this manual).
Use of the N2 analyzer near devices that generate electrical elds may cause
erratic readings.
If the N2analyzer is ever exposed to liquids (from spills or immersion) or to
any other physical abuse, turn the instrument OFF and then ON. This will
allow the unit to go through its self test to assure everything is operating
correctly. You may need to allow the sensor time to dry out.
Never immerse or expose the N2analyzer (including sensor) to high
temperatures (>70°C). Never expose the device to pressure, irradiation
vacuum, steam, or chemicals.
!

iiiWWW.MAXTEC.COM
»Replace the batteries with recognized high quality AA Alkaline or Lithium batteries.
»If the unit is going to be stored (not in use for 1 month), we recommend that you remove the
batteries to protect the unit from potential battery leakage.
FAILURE TO COMPLY WITH THESE WARNINGS AND CAUTIONS COULD RESULT IN INSTRUMENT
DAMAGE AND POSSIBLY JEOPARDIZE THE WELL BEING OF THE USER.

iv WWW.MAXTEC.COM
CAL
BAT
Warning
On/off Button
Calibration Button
Low Battery
Percent
Meets ETL standards
Do not throw away. Follow local
guidelines for disposal.
Calibration required
%
EC REP Authorized Representative
in the European Community
LOT
SN
Lot code/Batch code
Serial Number
REF Catalog Number
Manufacturer
Follow instructions for use.
1.2 SAFETY LABELING
The following symbols and safety labels are found on the N2Analyzer:
!

vWWW.MAXTEC.COM
TABLE OF CONTENTS
Classication.................................................... I
Warranty........................................................ I
Warnings .......................................................II
1.0 SYSTEM OVERVIEW.............................................1
1.1 Base Unit Description..........................................1
1.2 Component Identication.......................................2
1.3 Component Description ........................................2
1.4 Oxygen Sensor ...............................................3
2.0 OPERATING INSTRUCTIONS ......................................3
2.1 Getting Started ...............................................3
2.1.1 Protect Tape ..............................................3
2.1.2 Automatic Calibration ......................................3
2.2 Calibrating the N2Analyzer .....................................4
2.3 Operation with the Flow Restrictor ...............................4
3.0 FACTORS INFLUENCING ACCURATE READINGS .....................5
3.1 Elevation Changes ............................................5
3.2 Temperature Effects ...........................................5
3.3 Pressure Effects ..............................................5
3.4 Humidity Effects ..............................................6
4.0 CALIBRATION ERRORS AND ERROR CODES ........................6
5.0 CHANGING THE BATTERIES ......................................7
6.0 CHANGING THE OXYGEN SENSOR ................................8
6.1 R217P65.......................................................8
6.2 R217P66.......................................................9
7.0 CLEANING AND MAINTENANCE ..................................10
8.0 SPECIFICATIONS ..............................................11
8.1 Base Unit Specications ........................................11
8.2 Sensor Specications ..........................................11

vi WWW.MAXTEC.COM

1WWW.MAXTEC.COM
1.0 SYSTEM OVERVIEW
1.1 Base Unit Description
The N2analyzer provides unparalleled performance and reliability
due to an advanced design that includes the following features and
operational benets.
»Extra-life oxygen sensor of approximately 1,500,000 O2percent
hours
(2-year warranty).
»Durable, compact design that permits comfortable, hand-held
operation and easy to clean.
»Operation using only two AA Alkaline batteries (2 x 1.5 Volts) for
approximately 5000 hours of performance with continuous use. For
extra extended long life, two AA Lithium batteries may be used.
» Oxygen-specic, galvanic sensor that achieves 90% of nal value in
approximately 15 seconds at room temperature.
»Large, easy-to-read, 3 1/2-digit LCD display for readings in the
0-100% range.
»Simple operation and easy one-key calibration.
»Self-diagnostic check of analog and microprocessor circuitry.
»Low battery indication.
»Calibration reminder timer that alerts the operator, using a
calibration icon on the LCD display, to perform a unit calibration.

2WWW.MAXTEC.COM
1.2 Component Identication
1.3 Component Description
1 3 1/2-Digit Display - The 3 1/2 digit liquid crystal display (LCD)
provides direct readout of nitrogen concentrations in the range
of 0 - 105.0% (100.1% - 105.0% used for calibration determination
purposes). The digits also display error codes and calibration
codes as necessary.
2Low Battery Indicator - The low battery indicator is located at
the top of the display and is only activated when the voltage on
the batteries is below a normal operating level.
3“%” Symbol - The “%” sign is located to the right of the
concentration number and is present during normal operation.
4Calibration Symbol CAL - The calibration symbol is located at the
bottom of the display and is timed to activate when a calibration
is necessary.
5ON/OFF Key - This key is used to turn the device on or off.
6Calibration 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.
CAUTION: The device will assume a percent oxygen concentration when calibrating. Be
sure to apply 100% oxygen, or ambient air concentration to the device during calibration or the
device will not calibrate correctly.
Sample Inlet Connection - This is the port at which the device is
connected to determine oxygen concentration.
1
LCD Display
2
3
4
5
6
FIGURE 1
Keypad
Sample Inlet Connection

3WWW.MAXTEC.COM
1.4 Oxygen Sensor
The MAX-250 is a galvanic, partial pressure sensor that is specic
to oxygen. It consists of two electrodes (a cathode and an anode), a
oxygen permeable membrane and an electrolyte. Oxygen diffuses
through the teon membrane and immediately reacts at the cathode.
Concurrently, oxidation occurs electrochemically at the lead anode,
generating an electrical current and providing a voltage output.
Since the sensor is specic to oxygen, the current generated is
proportional to the amount of oxygen present in the sample gas.
When no oxygen is present, there is no electrochemical reaction and
therefore, negligible current is produced. In this sense, the sensor is
self-zeroing.
CAUTION: 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 to Maxtec for proper disposal or recovery.
CAUTION: Do not immerse the sensor in any cleaning solution, autoclave or expose the
sensor to high temperatures.
CAUTION: Dropping sensor may adversely affect its performance.
Do not throw away. Dispose of properly in accordance with local regulations.
2.0 OPERATING INSTRUCTIONS
2.1 Getting Started
2.1.1 Protect Tape
Prior to turning on the unit, a protective lm covering the threaded
sensor face must be removed. After removing the lm, wait
approximately 20 minutes for the sensor to reach equilibrium.
2.1.2 Automatic Calibration
After the unit is turned on it will automatically calibrate to
room air. The display should be stable and reading 79.1%.
To check the nitrogen concentration of a sample gas:
(after the unit has been calibrated)
1. Connect the Tygon tubing to the bottom of the
analyzer by threading the barbed adapter
onto the oxygen sensor.(Figure 2)
2. Attach the other end of the sample hose to

4WWW.MAXTEC.COM
the sample gas source and initiate ow of
the sample to the unit at a rate of 1-10 liters
per minute (2 liters per minute is recommended).
3. Using the “ON/OFF” key, make sure the unit
is in the power “ON” mode.
4. Allow the nitrogen reading to stabilize. This will
normally take about 30 seconds or more.
2.2 Calibrating the N2Analyzer
The N2analyzer should be calibrated upon initial power-up.
Thereafter, Maxtec recommends calibration on a weekly basis. To
serve as a reminder, a one week timer is started with each new
calibration. At the end of one week a reminder icon “ ” will appear
on the bottom of the LCD. Calibration is recommended if the user is
unsure when the last calibration procedure was performed, or if the
measurement value is in question.
Start calibration by pressing the key for more than 3 seconds. The
MaxO2+ will automatically detect if you are calibrating with 100%
oxygen or 20.9% oxygen (normal air). Do not attempt to calibrate to
any other concentration.
Compressed air (79.1% N2), 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.
»The CAL reminder icon is blinking at the bottom of the LCD.
»If you are unsure about the displayed N2percentage. (See factors
inuencing accureate readings.)
A simple calibration may be made with the sensor open to static @
Ambient air. For optimum accuracy Maxtec recommends that the
sensor be placed in a closed loop circuit where gas ow is moving
across the sensor in a controlled manner.
Calibrate with the same type of circuit and ow that you will use in
taking your readings.
2.3 Operation with the Flow Restrictor
1. Attach the Barbed Adapter to the N2analyzer by threading it on to
the bottom of the sensor.
2. Connect the Tygon tube to the barbed adapter.
3. Attach the BC adapter to the other end of the Tygon tube.
FIGURE 2

5WWW.MAXTEC.COM
4. Connect the inator hose on the other end of the Tygon tube.
5. If the N2analyzer is not already turned on, do so now by pressing
the analyzer “ON” button.
6. Initiate ow of nitrox to the unit to allow the gas to saturate
the sensor. The BC adapter will regulate the optimum ow and
pressure. Although a stable value is usually observed within 30
seconds, allow at least two minutes to ensure that the sensor is
completely saturated with the gas.
7. The analyzer will now look for a stable sensor signal and a good
reading. When obtained, the analyzer will display the oxygen
percentage on the LCD.
3.0 FACTORS INFLUENCING ACCURATE READINGS
3.1 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.
3.2 Temperature Effects
The N2 analyzer will hold calibration and read correctly within ±3%
when in thermal equilibrium 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 these reasons, the following is
recommended:
»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.
3.3 Pressure Effects
Readings from the N2analyzer 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:

6WWW.MAXTEC.COM
»Calibrate the N2analyzer at the same pressure as the sample gas.
» If sample gases ow through tubing, use the same apparatus and
ow rates when calibrating as when measuring.
»The N2analyzer oxygen sensor has been tested at pressures up
to two atmospheres absolute. Calibration or operation above this
pressure is beyond the intended use.
3.4 Humidity Effects
Humidity (non-condensing) has no effect on the performance
of the N2analyzer 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.
HELPFUL HINT: Dry sensor by lightly shaking moisture out, or ow a
dry gas at two liters per minute across the sensor membrane.
4.0 CALIBRATION ERRORS AND ERROR CODES
The N2analyzer 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 possible
actions to take, if an error code occurs.
E02: No sensor attached
Open the hand held N2analyzer and disconnect and reconnect sensor.
Unit should perform an auto calibration and should read 79.1%. If not,
contact Customer Service for possible sensor replacement.
E02: 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.
E02: Battery below minimum operating voltage

7WWW.MAXTEC.COM
Replace batteries.
CAL Err St: O2Sensor reading not stable
Wait for displayed nitrogen 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 specied operating temperature range).
CAL Err lo: Sensor voltage too low
Press and hold the Calibration Button for three seconds to
manually force a new calibration. 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 calibration. 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
Replace batteries.
5.0 CHANGING THE BATTERIES
Battteries should be changed by service personnel.
» Use only brand name batteries.
» Replace with two AA batteries and insert per orientation
marked on the device.
Should the batteries require changing the device will indicate this in
one of two ways:
» The battery icon on the bottom of the display will begin to ash.
This icon will continue to ash until the batteries are changed. The
unit will continue to function normally for approx. 200 hours.
» If the device detects a very low battery level, an error code of “E04”
will be present on the display, and the unit will not function until the

8WWW.MAXTEC.COM
batteries are changed.
To change the batteries, begin by
removing the three screws from the
back of the device. A #1 phillips
screwdriver is required to remove
these screws.
Once the screws are removed,
gently separate the two halves of
the device.
The batteries can now be replaced from
the back half of the case. Be sure to
orient the new batteries as indicated in
the embossed polarity on the back case.
NOTE: If the batteries are installed incorrectly
the batteries will not make contact and the device
will not operate.
Carefully, bring the two halves of the case together while positioning
the wires so they are not pinched between the two case halves. The
gasket separating the halves will be captured on the back case half.
Reinsert the three screws and tighten until the screws are snug. (Figure
4)
The device will automatically perform a calibration and begin
displaying
% of oxygen.
HELPFUL HINT: If unit does not function, verify that the
screws are tight to allow proper electrical connection.
6.0 CHANGING THE OXYGEN SENSOR
6.1 R217P67
Should the oxygen sensor require changing, the device will indicate
this by presenting “Cal Err lo” on the display after initiating a
calibration.
To change the oxygen sensor, begin by removing
the three screws from the back of the device.
A #1 Phillips screwdriver is required to
FIGURE 3
FIGURE 4

9WWW.MAXTEC.COM
remove these screws.
Once the screws are removed, gently
separate the two halves of the device.
Disconnect the oxygen sensor from the printed
circuit board by pressing the unlock lever rst
and then pulliing the connector out of the receptacle.
The oxygen sensor can now be replaced from the
back half of the case.
HELPFUL HINT: Be sure to orient the new sensor by aligning the
red arrow on the sensor with the arrow in the back case. A small tab
is located on the back case that is designed to engage the sensor and
prevent it from rotating within the case. (Figure 5)
NOTE: If the oxygen sensor is installed incorrectly, the case will not
come back together and the unit may be damaged when the screws
are reinstalled.
NOTE: If the new sensor has red tape over the outside, remove it,
then wait 30 minutes before calibrating.
Reconnect the oxygen sensor to the connector on the printed circuit
board.
Carefully bring the two halves of the case together while positioning
the wires to ensure they are not pinched between the two case
halves. Make sure the sensor is fully inserted and in the proper
orientation.
Reinsert the three screws and tighten until the screws are snug.
Verify the unit operates properly.
The device will automatically perform a calibration and begin
displaying % of oxygen.
6.2 R217P66
Should the oxygen sensor require changing, the device will indicate
this by presenting “Cal Err lo” on the display.
Unthread the sensor from the cable by rotating the thumbscrew
connector counterclockwise and pull the sensor from the connection.
Replace the new sensor by inserting the electrical plug from the
FIGURE 5

10 WWW.MAXTEC.COM
coiled cord into the receptacle on the oxygen sensor. Rotate the
thumbscrew clockwise until snug.
The device will automatically perform a calibration and begin
displaying
% of nitrogen.
7.0 CLEANING AND MAINTENANCE
Store the N2analyzer in a temperature similar to its ambient
environment of daily use.
The instruction given below describes the methods to clean and
disinfect the instrument sensor and its accessories:
Instrument:
»When cleaning or disinfecting the exterior of the N2analyzer,
take appropriate care to prevent any solution from entering the
instrument. Do not immerse unit in uids.
Oxygen Sensor:
»Clean the sensor with a cloth moistened with a 65% alcohol/water
solution.
»Maxtec does not recommend use of spray disenfectants because
they can contain salt, which can accumulate in the sensor
membrane and impair readings.
Accessories:
»The threaded barbed adapter may be cleaned by washing them with
a 65% alcohol/water solution (per manufacturer’s instructions). The
parts must be thoroughly dry before they are used.
Because of the variability of the cleaning processes, Maxtec cannot
provide specic instructions. Therefore, we highly recommend
referring to the manufacturer’s instructions on the details of method.

11WWW.MAXTEC.COM
8.0 SPECIFICATIONS
8.1 Base Unit Specications
Measurement Range: ...................................0-100%
Resolution:..............................................0.1%
Accuracy and Linearity: ....1% of full scale at constant temperature,
R.H. and pressure when calibrated at full scale
Total Accuracy: .... ±3% actual oxygen level over full operating temp
range
Response Time: ...90% of nal value in approximately 15 seconds at
23˚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)
Humidity: ..............................0-95% (non-condensing)
Power Requirements: ......... 2, AA Alkaline batteries (2 x 1.5 Volts)
Battery Life: .........approximately 5000 hours with continuous use
Low Battery Indication:.................
BAT
icon displayed on LCD
Sensor Type: ................................. Galvanic fuel cell
Expected Sensor Life: ............... > 1,500,000 O2percent hours
minimum 2-years in typical applications
Model Dimensions: ....................3.0" (W) x 4.0" (H) x 1.5" (D)
(76mm x 102mm x 38mm)
Weight: ..........................................0.4 lbs (170g)
8.2 Sensor Specications
Type: ..............................Galvanic fuel sensor (0-100%)
Life:............. 2-years in typical applications for Nitrogen A & AE
1-year in typical applicaitons for Nitrogen A Fast
Equipment in need of factory repair shall be sent to:
Maxtec
Service Department
2305 South 1070 West
Salt Lake City, UT 84119