Advanced Instruments Inc. GPR-3500 MO Portable Oxygen Purity Analyzer Owner’s Manual Owner’s Manual 2855 Metropolitan Place, Pomona, CA 91767 USA Tel: 909-392-6900, Fax: 909-393-3665, e-mail: info@aii1.com, www.aii1.
Advanced Instruments Inc.
Advanced Instruments Inc. Advanced Instruments Inc. appreciates your business and pledges to make every effort to maintain the highest possible quality standards with respect to product design, manufacturing and service. 2 Quality Control Certification Date: Model: Sensor: Accessories: Customer: Order No.
Advanced Instruments Inc. 3 General Safety & Installation Safety This section summarizes the basic precautions applicable to all analyzers. Additional precautions specific to individual analyzer are contained in the following sections of this manual. To operate the analyzer safely and obtain maximum performance follow the basic guidelines outlined in this Owner’s Manual.
Advanced Instruments Inc. Installation Gas Sample Stream: Ensure the gas stream composition of the application is consistent with the specifications and review the application conditions before initiating the installation. Consult the factory to ensure the sample is suitable for analysis. Note: In natural gas applications such as extraction and transmission, a low voltage current is applied to the pipeline itself to inhibit corrosion.
Advanced Instruments Inc. Flow rates of 1-5 SCFH cause no appreciable change in the oxygen reading. However, flow rates above 5 SCFH generate backpressure and erroneous oxygen readings because the diameter of the integral tubing cannot evacuate the sample gas at the higher flow rate. The direction the sample gas flows is not important, thus either tube fitting can serve as the inlet or vent – just not simultaneously.
Advanced Instruments Inc. Moisture and/or particulates generally can be removed from the sensor by opening the sensor housing and either blowing on the the sensing surface or gently wiping or brushing the sensing surface with damp cloth. Caution: Minimize the exposure of ppm sensors to air during this cleaning process. Air calibration followed by purging with zero or a gas with a low ppm oxygen concentration is recommended following the cleaning process.
Advanced Instruments Inc. The sensor employed by the GPR-3500MO is but one part of the proprietary advancements in sensor technology. It is the only electrochemical galvanic sensor available that is capable measuring 100% oxygen on a continuous 24/7 basis. Electronics The signal generated by the sensor is processed by state of the art low power micro-processor based digital circuitry. The first stage amplifies the signal. The second stage eliminates the low frequency noise.
Advanced Instruments Inc. Accuracy & Calibration Single Point Calibration: As previously described the galvanic oxygen sensor generates an electrical current proportional to the oxygen concentration in the sample gas. Absolute Zero: In the absence of oxygen the sensor exhibits an absolute zero, e.g. the sensor does not generate a current output in the absence of oxygen. Given these linearity and absolute zero properties, single point calibration is possible.
Advanced Instruments Inc. Zero Calibration In theory, the galvanic fuel cell type oxygen has an absolute zero meaning it produces no signal output when exposed to an oxygen free sample gas.
Advanced Instruments Inc. Span Calibration Span Calibration involves adjusting the transmitter electronics to the sensor’s signal output at a given oxygen standard. Maximum drift from calibration temperature is approximately 0.11% of reading per °C. The frequency of calibration varies with the application conditions, the degree of accuracy required by the application and the quality requirements of the user. However, the interval between span calibrations should not exceed three (3) months.
Advanced Instruments Inc. ¾ When certified span gas is not available to calibrate a ppm analyzer (immediately following air calibration reintroduce a gas with a low oxygen concentration to expedite the return to ppm level measurements as described above **). Mounting the Analyzer Normally mounting a portable analyzer is not a consideration. However, the GPR-3500 analyzer can operate continuously when connected to AC power using the appropriate charging adapter.
Advanced Instruments Inc. Installing the Oxygen Sensor The GPR-3500MO portable oxygen purity analyzer is equipped with an integral oxygen sensor. It has been tested and calibrated by the manufacturer prior to shipment and are fully operational from the shipping container.
Advanced Instruments Inc. Span Gas Preparation Caution: Do not contaminate the span gas cylinder when connecting the regulator. Bleed the air filled regulator (faster and more reliable than simply flowing the span gas) before attempting the initial calibration of the instrument. Medical grade oxygen: The FDA requires the use of certified gases for zeroing and calibrating analyzers used in certifying medical grade oxygen. Advanced Instruments Inc.
Advanced Instruments Inc. Charging the battery requires a common 9VDC adapter (positive pole located inside the female connector) supplied with the analyzer and a convenience outlet. The analyzer’s charging circuit accepts 9VDC from any standard AC 110V or 220V adapter (specified when the order is placed). The electronic design enables the analyzer to remain fully operable during the 8-10 hour charging cycle.
Advanced Instruments Inc. Zero Calibration In theory, the oxygen sensor produces no signal output when exposed to an oxygen free sample gas.
Advanced Instruments Inc. MAIN MENU CALIBRATION >>> AUTO SAMPLE MANUAL SAMPLE CALIBRATE 24.5 C 8. SPAN CALIBRATE ZERO CALIBRATE DEFAULT SPAN DEFAULT ZERO OUTPUT SPAN OUTPUT ZERO 100 KPA Press the ENTER key to calibrate or MENU key to abort and return to SAMPLING mode. 0.000 PPM ZERO CALIBRTION ENTER TO CALIBRATE MENU TO ABORT 9.
Advanced Instruments Inc. Output Zero Accuracy due to manufacturer tolerances may result in a slight difference between the LCD display and the 0-1V analog output. However, the difference is less than 0.25% of range and falls well below the specified accuracy of the analyzer. In rare instances the 01V analog signal output may not agree to the reading displayed by the LCD. This feature enables the user to adjust the 0V analog signal output when the LCD displays 00.00.
Advanced Instruments Inc. Span Calibration Maximum drift from calibration temperature is approximately 0.11% of reading per °C. The analyzer has been calibrated at the factory. However, in order to obtain reliable data, the analyzer must be calibrated at the initial start-up and periodically thereafter. The maximum calibration interval recommended is approximately 3 months, or as determined by the user’s application.
Advanced Instruments Inc. Caution: To assure an accurate calibration, the temperature and pressure of the span gas must closely approximate the sample conditions. The GPR-3500MO has a single 0-100% range and should be calibrate as described above. 1. 2. 3. 4. 5. 6. 7. Access the MAIN MENU by pressing the MENU key. Advance the reverse shade cursor using the ARROW keys to highlight CALIBRATE. Press the ENTER key to select the highlighted menu option.
Advanced Instruments Inc. 100.00 % SPAN CALIBRATION ENTER TO CALIBRATE MENU TO ABORT 23. Press ENTER to initiate the span calibration procedure 24. Allow approximately 60 seconds for the calibration process while the processor determines whether the signal output or reading has stabilized within 60% of the full scale low range. 25. Both the ZERO CALIBRATE and SPAN CALIBRATE functions result in the following displays: PASSED CALIBRATION OR FAILED CALIBRATION 26.
Advanced Instruments Inc. MAIN MENU AUTO SAMPLE MANUAL SAMPLE CALIBRATION CONFIG ALARMS BYPASS ALARMS 5. 6. CALIBRATION >>> SPAN CALIBRATE ZERO CALIBRATE DEFAULT SPAN DEFAULT ZERO OUTPUT SPAN OUTPUT ZERO Advance the reverse shade cursor using the ARROW keys to highlight DEFAULT SPAN. Press the ENTER key to select the highlighted menu option and the following display appears: 100.0 OUTPUT SPAN OFFSET PRESS UP OR DOWN TO CHANGE VALUE ENTER TO SAVE MENU TO RETURN 7.
Advanced Instruments Inc. Sampling GPR-3500MO Oxygen Portable oxygen purity analyzer requires positive pressure to flow the sample gas by the sensor to measure the oxygen concentration in a sample gas. If not available see Pressure & Flow section. Note: Prematurely zeroing the portable oxygen purity analyzer can cause the portable oxygen purity analyzer to display a negative reading in both the ZERO and SAMPLE modes. Procedure: 1.
Advanced Instruments Inc. 6 Maintenance With exception of components related to optional equipment and charging the battery of portable analyzers, cleaning the electrical contacts when replacing the sensor is the extent of the maintenance requirements of this analyzer as there are no serviceable parts in the analyzer given the nature of the solid state electronics and sensor.
Advanced Instruments Inc. Battery Charging the battery requires a common 9VDC adapter (positive pole located inside the female connector) supplied with the analyzer and a convenience outlet. The analyzer’s charging circuit accepts 9VDC from any standard AC 110V or 220V adapter. The electronic design enables the analyzer to remain fully operable during the 8-10 hour charging cycle. Procedure: 1.
Advanced Instruments Inc. 8 Troubleshooting Symptom Possible Cause Recommended Action reflect Sensor was not calibrated at the pressure, flow rate and temperature anticipated in the sample gas stream Recalibrate the analyzer Oxygen reading drifts toward zero Indication sensor is nearing the end of its useful life Replace sensor, see section 6 Maintenance Slow response time Liquid covering sensing membrane Gently remove with damp lint free towel.
Advanced Instruments Inc. 9 Warranty The design and manufacture of GPR Series oxygen analyzers, monitors and oxygen sensors are performed under a certified Quality Assurance System that conforms to established standards and incorporates state of the art materials and components for superior performance and minimal cost of ownership.
Advanced Instruments Inc. 10 MSDS – Material Safety Data Sheet Product Identification Product Name Oxygen Sensor Series - PSR, GPR, AII, XLT Synonyms Electrochemical Sensor, Galvanic Fuel Cell Manufacturer Advanced Instruments Inc., 2855 Metropolitan Place, Pomona, CA 91767 USA Emergency Phone Number 909-392-6900 Preparation / Revision Date January 1, 1995 Notes Oxygen sensors are sealed, contain protective coverings and in normal conditions do not present a health hazard.
Advanced Instruments Inc. Reactivity Data Stability Stable Conditions Contributing to Instability None Incompatibility KOH = Avoid contact with strong acids or Acetic Acid = Avoid contact with strong bases Hazardous Decomposition Products KOH = None or Acetic Acid = Emits toxic fumes when heated Conditions to Avoid KOH = None or Acetic Acid = Heat Spill or Leak Steps if material is released Sensor is packaged in a sealed plastic bag, check the sensor inside for electrolyte leakage.
Advanced Instruments Inc.
Advanced Instruments Inc. Output Zero Procedure: 1. Access the MAIN MENU by pressing the MENU key. 2. Advance the reverse shade cursor using the ARROW keys to highlight CALIBRATION. 3. Press the ENTER key to select the highlighted menu option. 4. The following displays appear: MAIN MENU AUTO SAMPLE MANUAL SAMPLE CALIBRATION CONFIG ALARMS BYPASS ALARMS 5. 6. 7.
Advanced Instruments Inc. MAIN MENU AUTO SAMPLE MANUAL SAMPLE CALIBRATION CONFIG ALARMS BYPASS ALARMS 5. 6. 7. CALIBRATION SPAN CALIBRATE ZERO CALIBRATE DEFAULT SPAN DEFAULT ZERO OUTPUT SPAN OUTPUT ZERO >>> Advance the reverse shade cursor using the ARROW keys to highlight OUTPUT SPAN. Press the ENTER key to select the highlighted menu option. The following display appears: 100.0 OUTPUT SPAN OFFSET PRESS UP OR DOWN TO CHANGE VALUE ENTER TO SAVE MENU TO RETURN 8. 9.
