maxtec MaxN2+ Instructions

MaxN2+
Instructions for Use

Product Disposal Instructions:
The sensor, batteries, and circuit board are not suitable for regular trash disposal. Return sensor to Maxtec for proper disposal or disposal according to local guidelines. Follow local guidelines for disposal of other components.

CLASSIFICATION

Protection against electric shock:………………………………………….. Internally powered equipment.
Protection against water: …………………………………………………………………………………………………IPX1
Mode of Operation: ……………………………………………………………………………………………… Continuous
Sterilization: …………………………………………………………………………………………………… See section 7.0
Flammable anesthetic mixture: …………………………………….. Not suitable for use in presence of a
………………………………………………………………………………………………. flammable anesthetic mixture

WARRANTY

The MaxN2+ analyzer is designed for nitrogen delivery equipment and systems. Under normal operating conditions, Maxtec warrants the MaxN2+  analyzerto be free from defects of workmanship or materials for a period of2-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  axN2+ analyzer 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 MaxN2+ analyzer. 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 the 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, misapplication, alteration, negligence, or accident.
These warranties are exclusive and in lieu of all other warranties, expressed or implied, including the 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.

• Improper use of this device can cause inaccurate oxygen readings which can lead to improper treatment, hypoxia, or hyperoxia. Follow the procedures outlined in this user manual.
• The device is specified for dry gas only.
• Before use, all individuals who will be using the MaxN2+ Analyzer 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 qualified service technician experienced in the repair of portable handheld equipment.
• Calibrate the MaxN2+ Analyzer weekly when in operation, or if environmental conditions change significantly. (ie, Elevation, Temperature, Pressure, Humidity — refer to Section 3.0 of this manual).
• The use of the MaxN2+ Analyzernear devices that generate electrical fields may cause erratic readings.
• If the MaxN2+ Analyzer 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. Never autoclave, immerse or expose the MaxN2+Analyzer (including sensor) to high temperatures (>70°C). Never expose the device to pressure, irradiation vacuum, steam, or chemicals.
• This device does not contain automatic barometric pressure compensation.
• Although the sensor of this device has been tested with various gases including nitrous oxide, Halothane, Isoflurane, Enflurane, Sevoflurane, and Desflurane and found to have acceptably low interference, the device in entirety (including electronics) is not suitable for use in the presence of a flammable anesthetic mixture with air or with oxygen or nitrous oxide. Only the threaded sensor face, flow diverter, and “T” adapter may be allowed to contact such a gas mixture.
• NOT for use with inhalation agents. Operating the device inflammable or explosive atmospheres may result in fire or explosion.

****CAUTIONS

Indicates a potentially hazardous situation, if not avoided, could result in minor or moderate injury and property damage.

• Replace the batteries with recognized high-quality AA Alkaline or Lithium batteries.
  DO NOT use rechargeable 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.

• The Maxtec Max-250 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.
  DO NOT use ethylene oxide sterilization.
  DO NOT immerse the sensor in any cleaning solution, autoclave, or expose the sensor to high temperatures.

• Dropping the sensor can adversely affect its performance.

• 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.

NOTE: This product is latex-free.

SYMBOL GUIDE

The following symbols and safety labels are found on the MaxO2+:

OVERVIEW

Base Unit Description

The MaxN2+ analyzer provides unparalleled performance and reliability due to an advanced design that includes the following features and operational benefits

• Extra-life oxygen sensor of approximately 1,500,000 O2 percent 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-specific, a galvanic sensor that achieves 90% of final 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.

Component Identification

1. 3-DIGIT LCD DISPLAY — The 3 digit liquid crystal display (LCD) provides a direct readout of oxygen concentrations in the range of 0 – 105.0% (100.1% to 105.0% used for calibration determination purposes). The digits also display error codes and calibration codes as necessary.
2. LOW 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.
4. CALIBRATION SYMBOL — The calibration symbol is located at the bottom of the display and is timed to activate when calibration is necessary.
5. ON/OFF KEY — This key is used to turn the device on or off.
6. 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.
7. SAMPLE INLET CONNECTION — This is the port at which the device is connected to determine oxygen concentration.

Max-250 Oxygen Sensor

The MAX-250 Series oxygen sensors offer stability and extra life. The MAX-250 Sensors are galvanic, partial pressure sensors that are specific to oxygen. It consists of two electrodes (a cathode and an anode), a Teflon membrane, and an electrolyte. Oxygen diffuses through the Teflon membrane and immediately reacts at a gold cathode. Concurrently, oxidation occurs electrochemically at the lead anode, generating an electrical current and providing a voltage output. Electrodes are immersed in a unique gelled weak acid electrolyte which is responsible for the sensor’s long life and motion insensitive characteristics. Since the sensor is specific 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, a negligible current is produced. In this sense, the sensor is self-zeroing

OPERATING INSTRUCTIONS

Getting Started

1. Protect Tape
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. Automatic Calibration
After the unit is turned on it will automatically calibrate to room air. The display should be stable and reading 79.1%.
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.

To check the oxygen 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 the sample gas source and initiate the flow 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.

Calibrating the MaxN2+ Analyzer

The MaxN2+ analyzer 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 MaxN2+ will auto- matically detect if you are calibrating with 100% oxygen or 20.9% oxygen (normal air).  Do not attempt to calibrate to any other concentration.
DO NOT attempt to calibrate to any other concentration.

Compressed air (79.1% N2), 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.
• The CAL reminder icon is blinking at the bottom of the LCD.
• If you are unsure about the displayed N2 percentage. (See factors influencing accurate readings.)

A simple calibration may be made with the sensor open to static at Ambient air. For optimum accuracy, Maxtec recommends that the sensor be placed in a closed-loop circuit where gas flow is moving across the sensor in a controlled manner.
Calibrate with the same type of circuit and flow that you will use in taking your readings.

Operation with the Flow Restrictor

1. Attach the Barbed Adapter to the MaxN2+ analyzer by threading it onto 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.
4. Connect the inflator hose on the other end of the Tygon tube
5. If the MaxN2+ analyzer is not already turned on, do so now by pressing the analyzer “ON” button.
6. Initiate flow of nitrox to the unit to allow the gas to saturate the sensor. The BC adapter will regulate the optimum flow 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

FACTORS INFLUENCING

ACCURATE READINGS

Elevation/Pressure 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.

Temperature Effects

The MaxN2+ 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.

Pressure Effects

Readings from the MaxN2+ 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 MaxN2+ 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 MaxN2+ analyzer oxygen sensor has been tested at pressures up to two atmospheres absolute. Calibration or operation above this pressure is beyond the intended use.

Humidity Effects

Humidity (non-condensing) has no effect on the performance of the MaxN2+ 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 the 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 flow a dry gas at two liters per minute across the sensor membrane.

CALIBRATION ERRORS AND

ERROR CODES

The MaxN2+ 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 handheld MaxN2+ analyzer and disconnect and reconnect the sensor. Unit should perform an auto-calibration and should read 79.1%. If not, contact Customer Service for possible sensor replacement.

E03: No valid calibration data available

• Make sure the 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

• Replace batteries.
  CAL ERR ST: O2 Sensor reading not stable

• Wait for the displayed oxygen reading to stabilize when calibrating the device at 100% oxygen.

• Wait for the 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 calibration. If the 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 the 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.

CHANGING THE BATTERIES

Batteries 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 flash. This icon will continue to flash 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 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 3)
The device will automatically perform calibration and begin displaying % of oxygen.
HELPFUL HINT: If the unit does not function, verify that the screws are tight to allow the proper electrical connection.

CHANGING THE OXYGEN SENSOR

MaxN2+ A (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 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 first and then pulling 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 4)
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 calibration and begin displaying % of oxygen.

MaxN2+ AE (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 pulling the sensor from the connection.
Replace the new sensor by inserting the electrical plug from the coiled cord into the receptacle on the oxygen sensor. Rotate the thumbscrew clockwise until snug.
The device will automatically perform calibration and begin displaying % of nitrogen.

CLEANING AND MAINTENANCE

Store the MaxN2+ analyzer 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 Cleaning:

• When cleaning or disinfecting the exterior of the N2 analyzer, take appropriate care to prevent any solution from entering the instrument.
  DO NOT immerse the unit in fluids.

• The MaxN2+ analyzer surface may be cleaned using a mild detergent and a moist cloth.

• The MaxN2+ analyzer is not intended for steam, ethylene oxide, or radiation sterilization.

Oxygen Sensor:
WARNING: Never install the sensor in a location that will expose the sensor to the patient’s exhaled breath or secretions, unless you intend to dispose of the sensor, flow diverter, and tee adapter after use.

• Clean the sensor with a cloth moistened with isopropyl alcohol (65% alcohol/water solution).
• Maxtec does not recommend the use of spray disinfectants because they can contain salts, which can accumulate in the sensor membrane and impair readings.
• The oxygen sensor is not intended for steam, ethylene oxide, or radiation sterilization.

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 specific instructions. Therefore, we highly recommend referring to the manufacturer’s instructions on the details of the method.

SPECIFICATIONS

Base Unit Specifications

Measurement Range: ………………………………………………………………………………………………….0-100%
Resolution: ……………………………………………………………………………………………………………………..0.1%
Accuracy and Linearity: …….1% of full scale at a 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 final 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 O2 percent 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)

Sensor Specifications

Type: ………………………………………………………………………………………. Galvanic fuel sensor (0-100%)
Life: …………………………………………………………. 2-years in typical applications for Nitrogen A & AE
…………………………………………………………………….1-year in typical applications for Nitrogen A Fast

MAXN2+ SPARE PARTS AND ACCESSORIES

Standard Replacement Parts and Accessories

Optional Accessories

Optional Adapters

Mounting Options (requires dovetail R217P23)

Carrying Options

NOTE: Repair of this equipment must be performed by a qualified service technician experienced in the repair of portable hand
held medical equipment.
Equipment in need of repair shall be sent to:
Maxtec
Service Department
2305 South 1070 West
Salt Lake City, Ut 84119
(Include RMA number issued by customer service)

2305 South 1070 West
Salt Lake City, Utah 84119
800-748-5355
www.maxtec.com

**Maxtec
2305 South 1070 West
Salt Lake City, Utah 84119
USA
phone: (800) 748.5355
fax: (801) 973.6090
email: sales@maxtec.com
web: www.maxtec.com
Conforms to:
AAMI STD ES60601-1, ISO STD
80601-2-55, IEC STD 606011-6,
60601-1-8 &62366
Certified to:
** CSA STD C22.2 No.60601-1

NOTE: The latest edition of this operating manual can be downloaded from our website at www.maxtec.com

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