Advanced Instruments Inc.. GPR-35 Oxygen Analyzer Ambient Area Monitoring Owner’s Manual 2855 Metropolitan Place, Pomona, CA 91767 USA ♦ Tel: 909-392-6900, Fax: 909-392-3665, e-mail: info@aii1.com, www.aii1.
Advanced Instruments Inc. Table of Contents Introduction 1 Quality Control Certification 2 Safety 3 Features & Specifications 4 Operation 5 Maintenance 6 Spare Parts 7 Troubleshooting 8 Warranty 9 10 Material Safety Data Sheet 1 Introduction Your new oxygen analyzer incorporates an advanced electrochemical sensor specific to oxygen along with state-of-the-art electronics designed to give you years of reliable precise oxygen measurements in variety of industrial oxygen applications.
Advanced Instruments Inc. 2 Quality Control Certification Date: Customer: Order No.
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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. Cleaning: The analyzer should be cleaned only as recommended by the manufacturer. Wipe off dust and dirt from the outside of the unit with a soft damp cloth then dry immediately. Do not use solvents or chemicals. Nonuse Periods: Disconnect the power when the analyzer is left unused for a long period of time. Recommended Safety Checklist The user is responsible for determining whether the unit will assure safety in his particular application and establishing safety precautions.
Advanced Instruments Inc. Pressure & Flow All electrochemical oxygen sensors respond to partial pressure changes in oxygen. The sensors are equally capable of analyzing the oxygen content of a flowing sample gas stream or monitoring the oxygen concentration in ambient air (such as a confined space such in a control room or an open area such as a landfill or bio-pond).
Advanced Instruments Inc. ¾ ¾ ¾ ¾ ¾ ¾ ¾ ¾ ¾ Assure there are no restrictions in the sample or vent lines Avoid drawing a vacuum that exceeds 14” of water column pressure – unless done gradually Avoid excessive flow rates above 5 SCFH which generate backpressure on the sensor. Avoid sudden releases of backpressure that can severely damage the sensor. Avoid the collection of liquids or particulates on the sensor, they block the diffusion of oxygen into the sensor - wipe away.
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Advanced Instruments Inc. 5 Operations Principle of Operation The GPR-35 oxygen analyzer incorporates a variety of percentage range advanced galvanic fuel cell type sensors. In compliance with OSHA specifications, the standard unit is configured with two oxygen alarms which have been set by the factory to energize audio and visual alarms when oxygen levels fall below CAUTION (20.0% O2) and DANGER (19.5% O2) housed in a general purpose NEMA 4 rated wall mount enclosure.
Advanced Instruments Inc. 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. The third stage employs a high frequency filter and compensates for signal output variations caused by ambient temperature changes. The result is a very stable signal. Sample oxygen is analyzed very accurately.
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. 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. Gas Connections The GPR-35 is designed for in-situ ambient or area monitoring and has no sample system because the sensor is intended to be exposed directly to the surrounding ambient atmosphere which it is sampling and to operate at atmospheric pressure, however, slightly positive pressure has minimal effect on accuracy. A certified span gas is recommended for calibration purposes.
Advanced Instruments Inc. Caution: To maintain the NEMA rating of the enclosure the user must seal all conduits in accordance with applicable local requirements. Additional penetrations to the enclosure may only be made by U/L or CSA certified personnel. Caution: Compliance with CE certification requires installing power and signal output cables through separate metal conduit.
Advanced Instruments Inc. Alarms The alarm comparator section of the electronics consists of an IC (integrated circuit) with internal references. The comparator compares the oxygen signal with the internal reference point. Two alarm points are set at 20.0% oxygen CAUTION (or optional HIGH O2 setpoint) alarm and 19.5% oxygen DANGER (or optional LOW 02 setpoint) alarm in compliance with OSHA specifications.
Advanced Instruments Inc. Installing the Oxygen Sensor GPR-35 Oxygen Analyzers are equipped with an integral oxygen sensor. They are fully operational from the shipping container with the oxygen sensor installed, tested and calibrated by the manufacturer prior to shipment. Should it be necessary to install the oxygen sensor – see section 6 Maintenance which covers replacing the oxygen sensor.
Advanced Instruments Inc. Establishing Power to the Electronics The analyzer has been fully tested, the dual oxygen alarms set according to OSHA or optional customer specifications, the battery fully charged and the oxygen sensor installed prior to shipment. With one end of the power cable connected to the analyzer’s terminals, as above which also includes the alarms and output connections, connect the other end of the power cable to the appropriate source of AC power. Procedure: 1.
Advanced Instruments Inc. Setting Alarm Values The alarm setpoint represents a value. The alarm comparator section of the electronics consists of an IC (integrated circuit) with internal references. The comparator compares the oxygen signal with the internal reference point. Two alarm points are set at 20.0% oxygen CAUTION (or optional HIGH O2 setpoint) alarm and 19.5% oxygen DANGER (or optional LOW 02 setpoint) alarm in compliance with OSHA specifications. The alarm comparators have a 2% of full scale (0.
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. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. Ensure the span gas flows freely: check for obvious leaks and make sure the vent hole in the Calibration Flow Adapter (P/N A-2344) is not blocked and the gas exits easily. If equipped with SS bulkhead tube fittings on the side of the analyzer remove the nut and ferrules of the tube fitting and push the plastic tubing over the male threads. Insert the flow through adapter into the opening of the sensor as illustrated below.
Advanced Instruments Inc. Procedure Air Calibration Sensor Flow Housing : Not recommended unless user confirms the ambient air or atmosphere surrounding the analyzer is not contaminated. 1. Review the above Span Calibration procedure and the following instructions before proceeding. 2. Access the interior of the analyzer by removing the four (4) screws securing the front panel. 3. Unscrew the knurled lock nut connecting the cable to the sensor. 4.
Advanced Instruments Inc. Application Pressure - Positive: A FLOW valve positioned upstream of the sensor controls the sample flow rate to the recommended 2 SCFH. If necessary, a pressure regulator (with a metallic diaphragm is recommended for optimum accuracy, the use of diaphragms of more permeable materials may result in erroneous readings) upstream of the flow control valve should be used to regulate the inlet pressure between 5-30 psig.
Advanced Instruments Inc. Standby The ¾ ¾ ¾ analyzer has no special storage requirements. The sensor should remain connected during storage periods. Store the analyzer with the power OFF. If storing for an extended period of time, charge before operating.
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. Serviceability: Except for replacing the oxygen sensor, there are no parts inside the analyzer for the operator to service.
Advanced Instruments Inc. 7 Spare Parts Recommended spare parts for the GPR-35 Series Portable Oxygen Analyzer: Item No. GPR-11-32-4 XLT-11-24-4 Description Oxygen Sensor Oxygen Sensor Other spare parts: Item No.
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Advanced Instruments Inc. 9 Warranty The design and manufacture of Advanced Instruments Inc. oxygen analyzers 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 Analytical Industries 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. Spill or Leak Steps if material is released Sensor is packaged in a sealed plastic bag, check the sensor inside for electrolyte leakage. If the sensor leaks inside the plastic bag or inside an analyzer sensor housing do not remove it without rubber or latex gloves and safety glasses and a source of water. Flush or wipe all surfaces repeatedly with water or wet paper towel (fresh each time). Disposal In accordance with federal, state and local regulations.
