Advanced Instruments Inc.
Owner’s Manual
GPR-3100
Oxygen Purity Analyzer
Advanced Sensor Technology
24 Month Operating Life in 100% Oxygen
Inherent Accuracy 0.1%, Resolution 00.01%
Auto Ranging & Suppressed Range Capability
Temperature Controlled & Barometric Compensationsy
2855 Metropolitan Place, Pomona, CA 91767 USA ♦ Tel: 909-392-6900, Fax: 909-392-3665, e-mail: info@aii2.com, www.aii2.com
Table of Contents
Advanced Instruments Inc.
Introduction
Quality Control Certification
Safety
Features & Specifications
Operation
Maintenance
Spare Parts
Troubleshooting
Warranty
1
2
3
4
5
6
7
8
9
(MSDS) Material Safety Data Sheet
Reference Drawings
Rev 3/2004 i
10
As Required
T
1 Introduction
Advanced Instruments Inc.
Thank You For Your Business
Your new oxygen analyzer is a precision piece of equipment
designed to give you years of use in variety of industrial
oxygen applications.
his analyzer is designed to measure the purity of oxygen gas
containing innert gases such as nitrogen, helium or argon
and/or other reactive gases such as hydrogen and gaseous
hydrocarbon gases as minor contaminants.
In order to derive maximum performance from your new
oxygen analyzer, please read and follow the guidelines
provided in this Owner’s Manual.
The serial number of this analyzer may be found on the inside
the analyzer. You should note the serial number in the space
provided and retains this Owner’s Manual as a permanent
record of your purchase, for future reference and for warranty
considerations.
Serial Number: _______________________
Every effort has been made to select the most reliable state of
the art materials and components designed for superior
performance and minimal cost of ownership. This analyzer was
tested thoroughly by the manufacturer for best performance.
However, modern electronic devices do require service from
time to time. The warranty included herein plus a staff of
trained professional technicians to quickly service your analyzer
is your assurance that we stand behind every analyzer sold.
Advanced Instruments Inc. appreciates your business and
pledge to make effort to maintain the highest possible quality
standards with respect to product design, manufacturing and
service.
1
Advanced Instruments Inc.
2 Quality Control Certification
Date: Customer: Order No.: Pass
Model
Sensor
Accessories
Configuration
Test - Electronics
Test - Gas Phase
Final
Notes
GPR-3100 High Purity % O2 Analyzer
GPR-11-120-OP
Owner’s Manual
CABL-1008 Power Cord Black 3 Conductor UL/CSA
HRWR-1021 Wrench 5/16 Combination
Ranges: 0-100%; suppressed 50-100%, 80-100%, 90-100%
A-1146-E-50 PCB Assembly Micro-processor / Display
A-1147-E-50 PCB Assembly Power Supply / Interconnection
Software Rev: _______
Wetted parts: Stainless steel
Power: Specify: ( x ) 100/120 VAC, ( ) 220/240 VAC
Enclosure: ( ) Panel mount 10.8”W x 7.5”H
( ) Rack mount panel 19”W x 12”H
( x ) Wall mount 12”W x 12”H x 8”D
Factory default zero (without sensor)
Factory default span @ 20 uA
Alarm relays activate/deactivate to changes in O
concentration
2
Sensor failure alarm
Power failure alarm
Analog signal output 0-1V and 4-20mA
Range ID voltage output
Baseline drift < ± 1% FS 90-100% range over 24 hour period
Noise level < ± 1.0% FS
Span adjustment within 10-50% FS
Temperature controller (CNTL-_______) set at 85°F
Overall inspection for physical defects
1 of 1 analyzer due ASAP
GPR-3100 Rev 7/2004 2 1 of 1
Advanced Instruments Inc.
3 Safety
This section summarizes the essential generic precautions applicable to all analyzers. Additional
precautions specific to individual analyzers 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.
Caution: This symbol is used throughout the Owner’s Manual to CAUTION and alert the user to
recommended safety and/or operating guidelines.
Danger: This symbol is used throughout the Owner’s Manual to identify sources of immediate DANGER
such as the presence of hazardous voltages.
Read Instructions: Before operating the analyzer read the instructions.
Retain Instructions: The safety precautions and operating instructions found in the Owner’s Manual
should be retained for future reference.
Heed Warnings: Follow all warnings on the analyzer, accessories (if any) and in this Owner’s Manual.
Follow Instructions: Observe all precautions and operating instructions. Failure to do so may result in
personal injury or damage to the analyzer.
Inlet Pressure: Recommended 5-30 psi, 100 psi maximum.
Outlet Pressure: The sample gas vent pressure should be atmospheric.
Oxygen Sensor: DO NOT open the sensor. The sensor contains a corrosive liquid electrolyte that could
be harmful if touched or ingested, refer to the Material Safety Data Sheet contained in the Owner’s
Manual appendix. Avoid contact with any liquid or crystal type powder in or around the sensor or sensor
housing, as either could be a form of electrolyte. Leaking sensors should be disposed of in accordance
with local regulations.
Mounting: The analyzer is approved for indoor use only. It may be used outdoors with optional
enclosures. Mount as recommended by the manufacturer.
Power: Supply power to the analyzer only as rated by the specification in Section 4 nd/or markings on
the analyzer enclosure. The wiring/cords that connect the analyzer to the power source should be
installed in accordance with recognized electrical standards and so they are not pinched particularly near
the power source and the point where they attach to the analyzer. Never yank a power cord to remove it
from an outlet or from the analyzer.
Operating Temperature: The maximum operating temperature is 45º C.
Heat: Situate and store the analyzer away from sources of heat.
Liquid and Object Entry: The analyzer should not be immersed in any liquid. Care should be taken so
that liquids are not spilled into and objects do not fall into the inside of the analyzer.
Handling: Do not use force when using the switches and knobs. Before moving your analyzer be sure
to disconnect the wiring/power cord and any cables connected to the output terminals located on the
analyzer.
Rev 10/2002 3
1
Advanced Instruments Inc.
3 Safety
Serviceability: Except for replacing the oxygen sensor, there are no parts inside the analyzer for the
operator to service.
Only trained personnel with the authorization of their supervisor should conduct maintenance.
Oxygen Sensor: DO NOT open the sensor. The sensor contains a corrosive liquid electrolyte that could
be harmful if touched or ingested, refer to the Material Safety Data Sheet contained in the Owner’s
Manual appendix. Avoid contact with any liquid or crystal type powder in or around the sensor or sensor
housing, as either could be a form of electrolyte. Leaking sensors should be disposed of in accordance
with local regulations.
Troubleshooting: Consult the guidelines in Section 8 for advice on the common operating errors before
concluding that your analyzer is faulty.
Do not attempt to service the analyzer beyond those means described in this Owner’s Manual. Do not
attempt to make repairs by yourself as this will void the warranty as per Section 9 and may result in
electrical shock, injury or damage. All other servicing should be referred to qualified service personnel.
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: Isolate ppb and ppm oxygen sensors as described in this manual and disconnect the
power when the analyzer is left unused for a long period of time.
Rev 10/2002 3
2
Advanced Instruments Inc.
Gas analysis solutions through advanced analyzer and sensor technology
Technical Specifications
Accuracy: < 1% of FS range at constant conditions; inherent accu-
racy of 0.1% following calibration with 95-100% oxygen
Analysis: 0-100% full scale range; 50-100%, 80-100%, 90-100 sup-
Application: Continuous monitoring of high purity oxygen levels up to
Approvals: CE
Area Classification: General purpose
Alarms: 2 adjustable form C relay contacts non-latching; “weak
Calibration:
Compensation: Barometric pressure and temperature; temperature con-
Connections: Compression tube fittings 1/8” inlet; 1/4” vent
Controls: Water resistant keypad; menu driven range selection,
Data Acquisition: Selectable data point intervals
Display:
Enclosure: Painted aluminum 7.5” x 10.8” x 12.25” panel mount
Flow Sensitivity: None between 1-3 SCFH, 2 SCFH recommended
Linearity: > .995 over all ranges
Pressure: Inlet - regulate to 5-30 psig; vent - atmospheric
Power: Specify 100/120 or 220/240 VAC
Response Time: 90% of final FS reading < 13 seconds
Sample System: Flow control, flow indicator, special integral sample
Sensitivity: 0.1% oxygen
Sensor Model: GPR-11-120-OP - requires no maintenance
Sensor Life: 24 months in 100% oxygen at 25ºC and 1 atm
Signal Output: 4-20mA isolated and 0-1V
Temp. Range: 5º to 45ºC
Warranty: 12 months analyzer; 12 months sensor
Wetted Parts: 316 stainless steel
Optional Equipment
Bezel for 19” rack mounting, wall mount NEMA4 and 4X enclosure
Sample conditioning accessories - contac t factory
pressed ranges
100% oxygen in inert, helium, hydrogen and mixed gases
sensor” indicator; power failure; system failure
Certified gas of O
oxygen for optimum accuracy; otherwise, O
approximate 80% of full scale range
trolled heated sample system and sensor housing
calibration, alarm and system functions
Graphical LCD 5 x 2.75; resolution .01%; displays real time
ambient temperature and pressure
temperature equalization system
balance N2 approximating 95-100%
2
content should
2
GPR-3100
Oxygen Purity Analyzer
Breakthrough Sensor Technology
24 month life at 100% Oxygen Levels
Accuracy < 1% FS Range
Sensitivity < 0.1% Oxygen
No maintenance
Inherent Accuracy 0.1% Following
Calibration With 100% Oxygen
4 Standard Analysis Ranges including
3 Suppressed Ranges 50/80/90-100%
Auto Zero, Span Calibration
Temperature Controlled Sample System
Pressure Compensated
Remote Communication Link
Certified ISO 9001 QA System
‘the only electrochemical
sensor based analyzer
capable of analyzing
> 99.5% pure oxygen
continuously 24/7
for 24 months‘
2855 Metropolitan Place, Pomona, CA 91767 USA ♦ Tel: 909-392-6900, Fax: 909-392-3665, www.aii1.com, e-mail: info@aii1.com Rev 5/05
Advanced Instruments Inc.
5 Operation
Principle of Operation
The GPR-3100 oxygen analyzer incorporates an advanced galvanic fuel cell type sensor capable of
measuring 100% oxygen on a suppressed range of 90-100% on a continuous basis It is the only
electrochemical sensor based analyzer capable of this measurement.
Background
The production of pure oxygen has been confined to the production of medical grade oxygen (99.0%,
typically specified at 99.5% or greater purity). However, the demand for oxygen is expanding rapidly due
largely to recent developments in chemical processes requiring elevated concentrations of oxygen (8595%) that boost yields and reduce emissions without significant cost increases and to a lesser extent the
growth of transfilling oxygen (92%) cylinders for home care use. The oxygen supplied can be be
generated cryogenically or by pressure (PSA) or vacuum (VSA) swing adsorption methods.
Historically producers and users have relied on analyzers based on paramagnetic method for measuring
oxygen purity. These sensor offer highly accurate results especially at the suppressed ranges of 90-100%
oxygen. However, they are very sensitive to changes in the flow rate of sample gas, the presence of
minute particulates and moisture, temperature variations and vibration. Consequently, paramagnetic
analyzers are expensive and require frequent almost daily calibration.
Analyzers based on galvanic sensor concept have always generated an interest for oxygen purity
measurements because they are specific to oxygen, versatile, low maintenance and inexpensive.
However, short sensor life (3-4 months at best) and the gradual drop (drift) in the signal output of the
micro-fuel cell with time has precluded their use.
Major Advancement in Galvanic Fuel Cell Sensor Technology
In competing with paramagnetic devices the focus was primarily on advancing the galvanic sensor
technology but also included temperature controlling the sample gas and automatically compensating the
signal output of the sensor for barometric pressure variations to assure a stable ‘drift free’ oxygen
measurement.
An advanced galvanic sensor has been developed that provides two years of sensor life and is capable of
operating properly on a continuous basis in 100% oxygen concentrations. This proprietary design
addresses the challenges of:
Providing a sufficient amount of anode material to support the reduction of oxygen over several years.
Maintaining at all times a sufficient concentration of hydroxyl ions to support the reduction of oxygen at
and near the sensing cathode.
Preventing the build-up of PbO at and near the sensing cathode (that eventually starts precipitating and
covers the sensing cathode) that can cause the signal output of the sensor to drop (drift) with time.
Through proprietary means the production rate of the reaction product is controlled without sacrificing
either the fast less than 13 second response time or any of the features (described above) of the microfuel cell analyzer. The resulting on-line and portable analyzers are approximately half the cost of their
paramagnetic counterparts.
The performance of the sensor was validated over 14 months of testing and exhibited excellent stability
in 100% oxygen. The sample flow rate was set at 0.1 lpm (and insensitive to changes of up to 1.0 lpm)
with the sample vented to the atmosphere via ¼” diameter tube to minimize the backpressure.
GPR-3100 Rev 2/05 1
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5 Operation
With the sensor and sample gas lines temperature controlled and the signal output of the sensor
compensated for ambient pressure variations it was possible to measure oxygen in the suppressed range
of 90-100% with less than +
periodically and found to be within +
scale over the fourteen month test period
suggesting the interval between calibrations
could be extended to several months.
To demonstrate the stability of the new
analyzer, 99.5% oxygen was introduced
(typically the threshhold for gas manufacturers)
for 30 days and the output plotted as shown at
the right. The resolution of the analyzer’s 4-1/2
digit display is 0.01%.
The maximum variation in the signal output is
0.1% oxygen over a 24 hour period and is
+
primarily to the variation in ambient
temperature.
1% of full scale (+0.1% oxygen) accuracy. The calibration was checked
1% of full
100.00
99.00
98.00
97.00
% Oxy gen
96.00
95.00
94.00
93.00
92.00
91.00
90.00
2 5 8 11141720232629
30 Day Stability in
99.5% Oxyg en
90-100% Suppressed Range
Day s
Advanced Sensor Technology Overview:
The sensor function on the same principle and are specific for oxygen. They measure the partial pressure
of oxygen from low ppm to 100% levels in inert gases, gaseous hydrocarbons, helium, hydrogen, mixed
gases, acid gas streams and ambient air.
Oxygen, the fuel for this electrochemical transducer, diffusing into the sensor reacts chemically at the
sensing electrode to produce an electrical current output proportional to the oxygen concentration in the
gas phase. The sensor’s signal output is linear over all ranges and remains virtually constant over its
useful life. The sensor requires no maintenance and is easily and safely replaced at the end of its useful
life.
Proprietary advancements in design and chemistry add significant advantages to an extremely versatile
oxygen sensing technology. Sensors for low ppm analysis recover from air to ppm levels in minutes,
exhibit longer life and reliable quality.
The expected life of our new generation of percentage range sensors now range to five and ten years
with faster response times and greater stability. Another significant development involves expanding the
operating temperature range for percentage range sensors from -30°C to 50°C.
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.
Additional features of the micro-processor based electronics include manual or auto ranging, optional
integral sample, span and zero inlet valves for auto-zero and auto-calibration at user specified intervals,
data acquisition and temperature tracking all which can be controlled remotely. Analog outputs, 0-1V and
an isolated 4-20mA, and an USB communication link are provided along with field selectable alarms with
dry relay contacts, power and range identification. An unique algorithm predicts and display a message
indicating a ‘weak sensor’ suggesting the sensor be replaced in the near future.
GPR-3100 Rev 2/05 2
Advanced Instruments Inc.
5 Operation
Sample System:
The GPR-3100 is supplied with stainless steel flow housing, fittings and tubing along with an integral flow
meter to provide optimum percentage range oxygen measurements. As a rule of thumb, the sample must
be properly presented to the sensor to ensure an accurate measurement. For optimum accuracy the
overall performance is enhanced by an temperature controlled heater system that controls the
temperature around the sensor to eliminate drift and daily calibration requirements associated with
competitive analyzers.
Advanced Instruments Inc. offers a full line of sample handling, conditioning and expertise to meet your
application requirements. Contact us at 909-392-6900 or e-mail us at aii2@earthlink.net
Controlling Pressure & Flow
All electrochemical oxygen sensors respond to partial pressure changes in oxygen. The inlet pressure
must always be higher than the pressure at the outlet vent which is normally at atmospheric pressure.
Despite the fact the oxygen reading is compensated for variations in barometric pressure (at the vent), it
is extremely critical for suppressed range measurements of 90-100% that backpressure be kept to an
absolute minimum. For this reason the analyzer is equipped with 1/8” inlet connections and ¼” vent
connections.
Flow Through Configuration:
The sensor is exposed to sample gas that must flow or be drawn through metal or plastic tubing, see
Application Pressure below, to the analyzer, through the analyzer’s internal sample system that includes
an o-ring sealed stainless steel sensor housing and finally is normally vented to atmosphere.
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. A flow indicator with an integral metering valve
upstream of the sensor is recommended as a means of controlling the flow rate of the sample gas. A flow
rate of 2 SCFH or 1liter per minute is recommended for optimum performance.
Assure that the vent line is connected to a ¼” or larger tube and is vented to atmosphere, with the
magnification associated with the use of suppressed ranges even the slightest amount of backpressure
will adversely affect the oxygen reading.
Caution: Do not place your finger over the vent (it pressurizes the sensor) to test the flow indicator
when gas is flowing to the sensor. Removing your finger (the restriction) generates a vacuum on the
sensor and may damage the sensor (voiding the sensor warranty).
Application Pressure - Positive:
A flow indicator with an integral metering valve positioned upstream of the sensor is provided for
controlling the sample flow rate between 1-5 SCFH. If necessary, a pressure regulator (with a metallic
diaphragm is recommended to prevent high oxygen readings resulting from the use of diaphragms of
more permeable materials) upstream of the flow control valve should be used to regulate the pressure.
Application Pressure - Atmospheric or Slightly Negative:
For accurate percentage range measurements, a sample pump is should be positioned downstream of
the sample inlet to draw the sample from the process through the analyzer’s sample system and by the
sensor. A flow indicator with an integral metering valve positioned downstream of the sensor is necessary
to obtain the recommended flow rate between 1-5 SCFH. If pump loading is a consideration, a second
GPR-3100 Rev 2/05 3
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5 Operation
throttle valve on the pump’s inlet side may be necessary to provide a bypass path so the sample flow
rate is within the above parameters.
An eductor jet pump is an alternative to a pump that is used in classified areas since it has no moving
parts or to eliminate the maintenance associated with mechanical pumps. The eductor must be
positioned downstream of the sample outlet. The eductor has three (3) orifices and requires a source of
compressed gas which enters through the top and exits at the bottom while drawing a mild vacuum (and
sample gas) through the side orifice. A flow indicator with an integral metering valve positioned
downstream of the sensor is recommended for controlling the sample flow rate between 1-5 SCFH.
To avoid erroneous oxygen readings and damaging the sensor:
¾ Assure there are no restrictions in the sample line that could create and draw a vacuum exceeding
14” of water column on the sensor.
¾ Avoid excessive flow rates above 5 SCFH which generate backpressure on the sensor.
¾ Avoid sudden changes in pressure that can severely damage the sensor – assure a flow control valve
is positioned upstream of the analyzer’s inlet.
¾ Assure no particulates, liquids or condensation collect on the sensor that could block the diffusion of
oxygen into the sensor.
¾ Do not place your finger over the vent (it pressurizes the sensor) to test the flow indicator when gas
is flowing to the sensor. Removing your finger (the restriction) generates a vacuum on the sensor
and may damage the sensor (voiding the sensor warranty).
GPR-3100 Rev 2/05 4
Advanced Instruments Inc.
5 Operation
Calibration and Accuracy
Single Point Calibration: As previously described the galvanic oxygen sensor generates an electrical
current sensor exhibiting 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.
Pressure: Because sensors are sensitive to the partial pressure of oxygen in the sample gas their
output is a function of the number of molecules of oxygen 'per unit volume'. Readouts in percent are
permissible only when the total pressure of the sample gas being analyzed remains constant. The
pressure of the sample gas and that of the calibration gas(es) must be the same (reality < 1-2 psi).
Temperature: The rate oxygen molecules diffuse into the sensor is controlled by a Teflon membrane
otherwise known as an 'oxygen diffusion limiting barrier' and all diffusion processes are temperature
sensitive, the fact the sensor's electrical output will vary with temperature is normal. This variation is
relatively constant 2.5% per ºC. A temperature compensation circuit employing a thermistor offsets this
effect with an accuracy of +5% or better and generates an output function that is independent of
temperature. There is no error if the calibration and sampling are performed at the same temperature or
if the measurement is made immediately after calibration. Lastly, small temperature variations of 10-15º
produce < +1% error.
Accuracy:
of errors: 1) those producing 'percent of reading errors', illustrated by Graph A below, such as +
temperature compensation
to make span adjustments and 2) those producing 'percent of full scale errors', illustrated by Graph B,
such as +1-2% linearity errors in readout devices, which are really minimal due to today's technology
and the fact that other errors are 'spanned out' during calibration.
GPR-3100 Rev 2/05 5
In light of the above parameters, the overall accuracy of an analyzer is affected by two types
5%
circuit, tolerances of range resistors and the 'play' in the potentiometer used
Advanced Instruments Inc.
5 Operation
Graph C illustrates these 'worse case' specifications that are typically used to develop an analyzer's
overall accuracy statement of +2% of full scale at constant temperature or +5% over the operating
temperature range. QC testing is typically <+0.5% prior to shipment.
Example: As illustrated by Graph A any error, play in the multi-turn span pot or the temperature
compensation circuit, during a span adjustment at 20.9% (air) of full scale range would be multiplied by
a factor of 4.78 (100/20.9) if used for measurements of 95-100% oxygen concentrations. Conversely, an
error during a span adjustment at 100% of full scale range is reduced proportionately for measurements
of lower oxygen concentrations.
Recommendation: The analyzer may be calibrated by using a certified span gas of 80-90% value of
the range of analysis. For example, for analysis on 90-100% range, use 98-99% oxygen as the span gas
and for analysis on 80-90% oxygen, use 96-98% oxygen as the span gas.
Note: The accuracy of the analyzer is given as the % of full-scale. Therefore, the calibration of the
analyzer must be done on the range of analysis or one range above the range of analysis. The analysis of
the sample gas must be carried out on the range that provides the required accuracy.
GPR-3100 Rev 2/05 6
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5 Operation
Installation
The GPR-3100 Oxygen Analyzer consists of an electronic module, sensor housing and sample system
housed in a 10.8”W x 7.5”H x 12.25”D enclosure suitable for panel mounting or 19” rack mounting with
the optional panel. A 12”W x 12”H x 8”D wall mount configuration is also available.
An integral temperature controlled heating system maintains the temperature of the sensor at a pre-set
temperature and assures the stability not found in competitive analyzers. The analyzer has been tested
and calibrated by the manufacturer prior to shipment.
Installation Considerations:
The GPR-3100 is fully operational from the shipping container with the oxygen sensor installed and
calibrated at the factory prior to shipment. Once installed, we recommend the user allow the analyzer to
stabilize for 30 minutes and then recalibrate the device as instructed below.
¾ Mounting the analyzer and optional components such as coalescing or particulate filters and pumps.
¾ Assemble the necessary hardware for mounting the analyzer and optional components, 1/8” stainless
steel tubing for interconnecting the analyzer and optional components.
¾ Review the application conditions to ensure the sample is suitable for analysis.
¾ Temperature: The sample must be sufficiently cooled before it enters the analyzer and any optional
components. A coiled 10 foot length of ¼” stainless steel tubing is sufficient for cooling sample gases
as high as 1,800ºF to ambient.
¾ Pressure & Flow: As described above.
¾ Moisture & Particulates: Prevent water and/or particulates from entering the sample system. They
can clog the tubing and damage the optional components such as pumps, scrubbers or sensors.
Installation of a suitable coalescing or particulate filter is required to remove condensation, moisture
and/or particulates from the sample gas to prevent erroneous analysis readings and damage to the
sensor or optional components. Consult the factory for recommendations concerning the proper
selection and installation of components.
¾ Contaminants: A gas scrubber and flow indicator with integral metering valve are required upstream
of the analyzer to remove interfering gases such as oxides of sulfur and nitrogen or hydrogen sulfide
that can produce false readings and reduce the expected life of the sensor. Installation of a suitable
scrubber is required to remove the contaminant from the sample gas to prevent erroneous analysis
readings and damage to the sensor or optional components. Consult the factory for
recommendations concerning the proper selection and installation of components.
¾ Gas connections: Inlet gas lines require 1/8” diameter metal tubing whereas ¼” diameter tubing is
required for the vent. Span gas and required accessories are the responsibility of the user.
¾ Power connection: To meet hazardous area classification and weatherproofing requirements install
the interconnection wiring in rigid conduit.
¾ Output connections. To assure proper grounding, connect the 4-20mA signal output to the external
power source before attempting calibration adjustments.
¾ Establishing power to the electronics.
¾ Setting the alarm values (if applicable).
¾ Zeroing the analyzer (required only for very low percentage range measurements).
¾ Calibrating the analyzer.
GPR-3100 Rev 2/05 7
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5 Operation
Mounting the Analyzer:
The GPR-3100’s 10.8”W x 7.5”H x 12.25”D configuration is designed for panel mounting directly to any
flat vertical surface, wall or bulkhead plate with the appropriate cut out. To facilitate servicing the interior
of the analyzer, position it approximately 5 feet off the floor. It can also be mounted in a standard 19”
rack with an optional panel.
When mounting the analyzer in a 19” rack allow sufficient room for access to the terminal connections at
the rear of the enclosure.
Note: The proximity of the analyzer to the sample point and use of optional sample conditioning
components have an impact on sample lag time.
GPR-3100 Rev 2/05 8
Advanced Instruments Inc.
5 Operation
Gas Connections:
The GPR-3100 is designed for positive pressure samples and requires connections for incoming sample
and vent lines. Optional zero and span inlet ports are provided as part of the optional sample systems.
Optional Span and Zero Inlet Ports Standard Sample and Vent Ports
The user is responsible for making provision for introducing gases for calibration purposes. 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. A flow indicator with an integral metering valve
upstream of the sensor is recommended as a means of controlling the flow rate of the sample gas. A flow
rate of 2 SCFH or 1 liter per minute is recommended for optimum performance.
Caution: Do not place your finger over the vent (it pressurizes the sensor) to test the flow indicator
when gas is flowing to the sensor. Removing your finger (the restriction) generates a vacuum on the
sensor and may damage the sensor (voiding the sensor warranty).
GPR-3100 Rev 2/05 9
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5 Operation
Procedure:
Caution: Do not change the factory setting until instructed to do in this manual.
1. Regulate the pressure and flow of the incoming sample and zero/span calibration gas(es) as
described in Controlling Pressure & Flow above.
2. Connect the ¼” vent line to the compression fitting labeled VENT.
3. Connect the 1/8” sample line to the fitting labeled SAMPLE.
4. Connect the 1/8” ZERO and SPAN gas lines as labeled, if equipped with optional sample system(s).
5. Once power is established to the analyzer, purge the air trapped inside the sample system.
6. Allow gas to flow through the analyzer for 3-5 minutes and set the flow rate to 2 SCFH
The analyzer is ready for calibration.
Power Connections:
Power for the on-line analyzers is supplied by an integral universal (100-240V AC) power supply. The
appropriate AC line voltage is supplied with a standard power cord through a universal power entry
module. A standard computer type power cord (P/N A-1008 is required for the universal power entry
module.
Note: While the power entry module is universal, the heater is not. The heater must be configured to
the local power supply (100-110 or 220-240V AC) at time of order.
Power Connections for External Calibration Valves
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5 Operation
Output Connections
As illustrated above the sensor, alarm relays and signal output connections are hard wired to screw type
terminal blocks located at the rear of the analyzer.
1. Use a small bladed screwdriver to loosen the appropriate terminal screws as illustrated above.
2. Strip the wires of the cable no more than 3/16 inch.
3. To connect to an active relay or “fail safe”, connect the live cable to the common terminal C and the
secondary cable to the normally open NO terminal.
4. To break the connection upon relay activation, connect the secondary cable to the normally closed NC
terminal.
5. Insert the stripped end of the cables into the appropriate terminal slots assuring no bare wire remains
exposed that could come in contact with the back panel of the analyzer enclosure.
6. Tighten the terminal screws to secure the wires of the cable.
Danger: While connecting the cables to the relay terminals, ensure there is no voltage on the cables to
prevent electric shock and possible damage to the analyzer.
Caution: Assure the stripped wire ends of the cable are fully inserted into the terminal slots and do not
touch each other or the back panel of the analyzer enclosure.
Alarm Relays
The four alarm circuit connectors are spring loaded terminals for making connections to internal alarm
relay contacts.
Alarm 1 and Alarm 2 - Represents two threshold type alarms that can be set and configured in the field
from the analyzer’s display menu layout in Appendix A&B, Alarm menu as follows:
Establish independent set points
Either Hi or Lo
Either On or Off (enabled or disabled)
Both temporarily defeated using a user entered ‘timeout’ period (normally minutes)
The alarm set point represents a value. When the oxygen reading exceeds (high alarm) or falls below
(low alarm) the alarm set point, the relay is activated and the LCD displays the alarm condition. When
activated the alarms trigger SPDT Form C non-latching relays @ 5A, 30VDC or 240VAC resistive. To
prevent chattering of the relays, a 2% hysteresis is added to the alarm set point. This means that the
alarm will remain active until the oxygen reading has fallen 2% below the alarm set point (high alarm) or
risen 2% above the alarm set point (low alarm) after the alarm was activated.
Aside from being totally defeated in the Off mode, the timeout feature is useful while replacing the
oxygen sensor or during calibration when the oxygen reading might well rise above the alarm set point
and trigger a false alarm.
Note: When making connections the user must decide whether to configure/connect Alarm 1 and Alarm
2 in failsafe mode (Normally Open – NO – where the alarm relay de-energizes and closes in an alarm
condition) or non-failsafe mode (Normally Closed – NC – where alarm relay energizes and opens in an
alarm condition).
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Power Failure Alarm
A dry contact rated at 30VDC @ 1A is provided as a power failure alarm that activates when power
supplied to the analyzer’s circuits is unacceptable. The contact is normally closed but opens when the
power to the analyzer is switched off or interrupted and cannot be disabled.
Weak Sensor Indicator
A 5V output with negative ground is provided when the sensor is operational. The output is 0V when the
sensor output drops 20-25% from a baseline established at a previous calibration.
4-20mA and 0-1V Signal Outputs
The analyzer provides 0-1V full scale with negative ground and a 4-20mA full scale fully isolated ground
signals for external recording devices. The integral IC on the main PCB converts the 0-1V signal with
negative ground to a 4-20mA fully isolated signal. A finer adjustment of the zero offset of the 4-20mA
converter can be provided by a potentiometer mounted on the main PCB Assembly. Consult factory for
instructions.
Caution:
NOT supply any voltage to either of the two terminals of the 4-20mA converter.
The integral 4-20mA converter is internally powered and does not require external power. DO
Range ID (identification)
A voltage output corresponding to each range is provided. The output of the highest range (normally
CAL) is 5V and the remaining three ranges 4V, 3V and 2V for the low range.
RS-232 / USB Port
The digital signal output is a standard 9-pin D connection type RS-232 serial communications port used
to connect the analyzer to a computer, terminal or other digital device.
Bi-directionsl data lines are provided via a RS-232C serial port for diagnostics and access via remote
computer that enables the user to obtain status information and initiate functions remotely.
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5 Operation
Installing the Oxygen Sensor
The GPR-3100 is equipped with an integral oxygen sensor that is fully operational from the shipping
container with the oxygen sensor installed, tested and calibrated by the manufacturer prior to shipment.
However, for a variety of reasons it may be necessary to ship the oxygen sensor separately.
Caution: DO NOT open the oxygen sensor. The sensor contains a corrosive liquid electrolyte that could
be harmful if touched or ingested, refer to section 10 Material Safety Data Sheet of this manual.
Avoid contact with any liquid or crystal type powder in or around the sensor or sensor housing, as either
could be a form of electrolyte. Leaking sensors should be disposed of in accordance with local
regulations.
Note: All analyzers must be calibrated once the installation has been completed and periodically
thereafter as described below.
Procedure:
1. Using the 5/16 wrench supplied loosen but do not
remove the clamp bolt – the long one located in the
center under the bottom section of the sensor
housing.
2. Rotate the upper section of the sensor housing 90º
to disengage from the clamp.
3. Remove the upper section by pulling it straight up
and place it on a smooth surface.
4. Open the barrier bag containing the new sensor.
5. Remove the new oxygen sensor from the shipping
bag and remove the red label and the gold ribbon
(shorting device) from the PCB at the rear of the
sensor.
6. Caution: Minimize the time the sensor is exposed to
ambient air.
7. Place the new sensor in the bottom section of the sensor housing with the PCB facing up.
8. Place the upper section of the sensor housing over the sensor.
9. Gently push the upper section downward and rotate 90º to engage the clamp.
10. Finger tighten the clamp bolt and one full turn with the 5/16 wrench to compressed the o-ring seal.
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5 Operation
Installing Span Gas
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.
Required components:
¾ Span gas cylinder with an oxygen concentration described in the Calibration section below.
¾ Regulator to reduce pressure to between 5 and 30 psig.
¾ Flowmeter to set the flow to 2 SCFH,
¾ Suitable male union connector to connect the regulator to the Flowmeter.
¾ Fitting, preferably with barbed and male NPT connections, to connect the flowmeter vent to one end
of the plastic Tygon tubing.
¾ 4-6 feet of 1/8” diameter metal tubing.
Procedure:
1. With the span gas cylinder valve closed, install the regulator on the cylinder.
2. Open the regulator’s exit valve and partially open the pressure regulator’s control knob.
3. Open slightly the cylinder valve.
4. Loosen the nut connecting the regulator to the cylinder and bleed the pressure regulator.
5. Retighten the nut connecting the regulator to the cylinder
6. Adjust the regulator exit valve and slowly bleed the pressure regulator.
7. Open the cylinder valve completely.
8. Set the pressure between 5-30 psig using the pressure regulator’s control knob.
Caution: Do not exceed the recommended flow rate. Excessive flow rate could cause the backpressure
on the sensor and may result in erroneous readings and permanent damage to the sensor.
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5 Operation
Establishing Power to the Electronics:
Once the power cord is connected into to the power entry module at the rear of the enclosure as
illustrated above, connect the plug end to the appropriate AC outlet.
When power is applied to the analyzer, the analyzer performs diagnostic status checks and the 5” x 2.75”
graphical LCD displays the following:
Note: After establishing power to the analyzer, place the SENSOR BYPASS SWITCH (SW1) in the ON
position. SW1 has been placed on the OFF position prior shipment as a precautionary measure to isolate
the sensor from the electronics. SW1 is located near the ribbon cable connector on the right side of the
Main Micro-processor / Display PCB Assembly attached to the front door of the analyzer.
System Self Test
CPU OK
Memory OK
RTC OK
Analog OK
A few seconds after the completion of the status checks the LCD will display the following information:
A few seconds after the information display appears the LCD will display the MAIN MENU.
GPR Series Oxygen Analyzer
Serial No.
Advanced Instruments Inc.
2855 Metropolitan Place
Pomona, CA 91767
Tel: 909-392-6900
Fax: 909-392-3665
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5 Operation
Operating the Menu Driven Controls –
The appendix details the entire menu layout and functional operation of the GPR-1600 when equipped
with either the standard bypass or optional zero and span inlets sample systems with manual valves.
1. The menu options at the upper left corner are as simple and straightforward as possible.
2. The current MODE of the analyzer is indicated at the top center of the LCD.
3. The upper line across the bottom of the LCD reflects information related to the analyzer’s range:
a. ‘Auto Range’ indicates whether the user has selected manual (MAN) or auto (AUTO) ranging.
c. ‘0 to 1000 PPM’ reflects the current range of measurement.
4. The bottom line across the bottom of the LCD reflects information utilized by the micro-processor:
a. Temperature inside the insulated analyzer enclosure
b. Ambient pressure
c. Date
d. Time
Menu Navigation:
The cursor indicates the menu option selected with an asterisk (*).
Press the yellow UP or DOWN arrow keys to move the cursor and select a menu option.
Press the green ENTER key to accept the menu option selected with the (*) cursor.
Press the red ESC escape key to return to the previous menu.
Note: If a selection is not made within 30 seconds, the display returns to the MAIN MENU.
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5 Operation
Range Selection:
The analyzer display defaults to the sampling mode when 30 seconds elapses without user interface.
The GPR-3100 analyzer provides four (4) standard ranges and gives users a choice of sampling modes.
By accessing the MAIN MENU, users may select either the AUTO SAMPLING (ranging) or MANUAL
SAMPLING (to lock on a single range) mode.
Auto Sampling
The display will shift to the next higher range when the oxygen reading (actually the sensor’s signal
output) exceeds 99.9% of the upper limit of the current range. The display will shift to the next lower
range when the oxygen reading drops to 85% of the upper limit of the next lower range.
For example, if the analyzer is reading 1% on the 0-10% range and an upset occurs, the display will shift
to the 0-25% range when the oxygen reading exceeds 9.9%. Conversely, once the upset condition is
corrected, the display will shift back to the 0-10% range when the oxygen reading drops to 8.5%.
Manual Sampling
The display will not shift automatically. Instead, when the oxygen reading (actually the sensor’s signal
output) exceeds 110% of the upper limit of the current range an OVER RANGE warning will be displayed.
Once the OVER RANGE warning appears the user must advance the analyzer to the next higher range via
the menu and keypad Press MENU, select MANUAL SAMPLING, press ENTER, select the appropriate
MANUAL RANGE and press ENTER again.
Temperature Controlled Heater System with Runaway Protection Circuit
If the analyzer is equipped with an optional temperature controlled heater system, open the front door of
the analyzer to access it. This unit is a PID controller which operates between 0-99°F. The controller is
programmed to maintain the temperature at 75-85°F.
Caution: Do not change this setting. A higher temperature setting may drastically reduce sensor life
and possibly cause damage to the electronic circuitry of both the controller and the analyzer.
Warning:
When power is applied to the temperature controller, the controller tunes itself to eliminate and/or
minimize the over/under shoot of temperature from the set point.
It is recommended that at initial start-up, when replacing the oxygen sensor or when trouble shooting,
turn off the power to the heater or set the temperature set point at 60°F to turn the heater off to prevent
overheating the analyzer.
This can be achieved by pressing the “INDEX” (LOVE Controller) and then using the UP/DOWN arrow key
to set the temperature to 60°F. After setting the temperature, press the RETURN key to complete the
process.
With ATHENA controller, simply use the UP/DOWN arrow key to set the temperature to the desired value.
Keep the front door securely fastened closed when the temperature controller is ON.
When operating the analyzer under normal conditions, set the temperature between 75-85°F.
Changing the display value from °F to °C:
1. Push the UP ARROW and ENTER buttons down for 5 seconds to access the SECURE MENU
2. Press INDEX to advance to the F-C MENU
3. Select °C or °F by pressing the UP ARROW key
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5 Operation
4. Press the ENTER key when F-C starts flashing on the display
5. Press INDEX to exit the SECURE MENU
Part of the optional temperature controlled heater system is a heater runaway protection circuit that
protects the electronics in the event the temperature controller should fail and thereby allowing the
heater to runaway damaging the interior of the analysis unit.
The runaway protection is provided by a J2 type device positioned between the temperature controller
and the heater.
This device cuts of power to the heater if the temperature inside the analysis unit exceeds 70°C.
Should the J2 device cut power to the heater, correct the problem and reset the runaway protector
device by exposing it to 0°C for a few minutes (a refrigerator freezer will do).
Installation is complete . . . proceed to Calibration
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5 Operation
Calibration - General Guideline
Zeroing the analyzer is recommended for oxygen measurements requiring accuracy greater than +/-
0.5% oxygen and when the analysis is carried out on 0-100% range. The ZERO OFFSET is not required if
the analysis is carried out on the suppressed ranges.
Caution: Do not attempt to calibrate the unit in the atmosphere air (20.9% oxygen) and use the
analyzer for either elevated or high purity oxygen measurements.
Zero calibration should precede the span calibration and once performed should not have to be repeated
with subsequent span calibrations. Normally, zero calibrations are performed when a new sensor is
installed or changes are made in the sample system connections.
Certifying Medical Grade Oxygen:
The FDA requires the use of certified gases for zeroing and calibrating analyzers used in certifying
medical grade oxygen.
The analyzer zero gas must be a certified cylinder of nitrogen with a minimum purity of 99.9%.
Once the analyzer has been zeroed (as described below), calibrate (as described below) with a
certified cylinder of oxygen with a minimum purity of 99.2%.
Advanced Instruments Inc. recommends zeroing and calibrating the analyzer at least every 8 hours or
before each certification.
Non-medical grade oxygen applications:
In non-medical applications the analyzer does not require zeroing before every calibration. It is
recommended the analyzer be calibrated at least monthly. In most cases a nitrogen zero gas of 99%
minimum purity and a span gas of 95-100% oxygen purity is sufficient.
Zero Calibration
In theory, the oxygen sensor produces no signal output when exposed to an oxygen free sample gas.
However, the analyzer will generate an oxygen reading when sampling oxygen free sample gas due to:
¾ Contamination or quality of the zero gas
¾ Minor leakage in the sample line connections
¾ Residual oxygen dissolved in the sensor’s electrolyte
¾ Tolerances of the electronic components
Zero calibration is recommended for very low percentage measurements on the 1% range only. It is not
practical on higher ranges, such as ambient monitoring, because of the low value, normally < 0.1%, is
not material to the accuracy of higher level measurements.
Procedure:
In the event the user desires to conduct a zero calibration, with a few differences a zero calibration
follows the same procedure as the span calibration described above. Differences include substituting a
suitable zero gas for the span gas and allowing the analyzer 24 hours with flowing zero gas to determine
the true zero offset (a stable reading evidenced by a horizontal trend on an external recording device) of
the system before conducting the zero calibration. A minimum of 24 hours is required for the sensor to
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5 Operation
consume the oxygen that has dissolved into the electrolyte inside the sensor (while exposed to air or
percentage levels of oxygen).
However, finding the true zero offset (and waiting 24 hours) is not always necessary particularly in the
case of applications requiring higher level oxygen measurements. But, being absolutely precise and
correct requires time.
Satisfying users that the zero offset is reasonably acceptable for their application can be accomplished
much quicker. Unless the zero gas is contaminated or there is a significant leak in the sample
connections, the analyzer should read less than 0.1% oxygen within 15 minutes after being placed on
zero gas.
The maximum zero calibration adjustment permitted is 60% of the lowest full scale range available,
which normally is 1%. Thus the maximum zero calibration adjustment or zero offset is 0.6% oxygen.
Accordingly, the analyzer’s ZERO has not been adjusted prior to shipment because the factory conditions
are different from the application condition at the user’s installation.
Accuracy due to manufacturer tolerances may result in a slight difference between the LCD display and
the analog output of the 4-20mA integrated circuit. However, the difference is less than 0.25% of range
and falls well below the specified accuracy of the analyzer.
Default Span:
Refer to Appendix A, the software will eliminate any previous span calibration adjustment and display the
actual the signal output of the sensor at a specified oxygen concentration. For example, when a span gas
of say 21% is introduced, the display will reflect an oxygen reading within +
This feature allows the user to test the sensor’s signal output without removing it from the sensor
housing.
Default Zero:
Refer to Appendix A, the software will eliminate any previous span calibration adjustment and display the
actual the signal output of the sensor at a specified oxygen concentration. For example, assuming a zero
gas is introduced, the display will reflect an oxygen reading representing basically the zero calibration
adjustment as described above.
This feature allows the user to test the sensor’s signal output without removing it from the sensor
housing.
50% of the span gas value.
Span Calibration
Refer to the Installing Span Gas and Calibration – General Guideline sections above.
Maximum drift from calibration temperature is approximately 0.11% of reading per °C. The GPR-3100
has been calibrated at the factory. However, in order to obtain reliable data, the analyzer must be
calibrated at installation (for optimum accuracy 24 hours after installation) and periodically thereafter
recommended every 3-4 months, or as determined by the user’s application. This involves calibrating the
analyzer electronics to the sensor’s signal output at a given oxygen standard, e.g. instrument air or a
certified span gas approximating 21% oxygen content.
Assuming the initial zero is performed according to the procedure described herein, the analyzer should
not require zeroing again until the either the sensor is replaced or a change is made to the sample
system or gas lines. In most cases, a zero gas of 99% nitrogen purity and a span gas of 95-100%
oxygen purity are sufficient. Following the initial zero and calibration, the analyzer should not require
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5 Operation
span calibration again for up to 3 months under “normal” application conditions as described in the
published specifications.
In standard configuration, the GPR-3100 can be calibrated by exposing the sensor to the readily available
cost effective and reliable 20.9% (209,000 ppm) oxygen concentration of ordinary atmospheric air or a
certified span gas with an oxygen concentration of 80-100% of full scale range balance nitrogen. For
example, for a 0-25% range, the span gas should be a certified grade between 19-23% oxygen
preferably approximately 20.9% oxygen.
Accuracy due to manufacturer tolerances may result in a slight difference between the LCD display and
the analog output of the 4-20mA integrated circuit. However, the difference is less than 0.25% of range
and falls well below the specified accuracy of the analyzer.
Factory Default Span
The software will set the SPAN adjustment based on the average oxygen reading (actually the sensor’s
signal output) at a specified oxygen concentration. For example, when a span gas is introduced, the
micro-processor will display an oxygen reading within +
the user to test the sensor’s signal output without removing it from the sensor housing.
Manual Span
50% of the span gas value. This feature allows
The user must ascertain that the oxygen reading (actually the sensor’s signal output) has reached a
stable value within the limits entered below before entering the span adjustment. Failure to do so will
result in an error. Entering the span value – follow the menu layout in Appendix A.
Procedure:
1. Recommended for flow through configurations, refer to Appendix A for a description of this features
and operational instructions.
2. Select the RANGE dictated by the accuracy of the analysis required, see Calibration – General
Guideline above
3. Advance the cursor (*) on the MAIN MENU to SAMPLE and press ENTER to accept the selection.
4. From the above SAMPLE menu advance the cursor (*) to MANUAL RANGING and press ENTER.
5. Advance the cursor (*) on the MAN RANGE menu the RANGE dictated by the span gas and press
ENTER to select.
6. Return to the MAIN MENU and display the oxygen concentration of the span gas.
7. Assure there are no restrictions in the span gas line.
8. Regulate the pressue and control the flow rate as described above, 5-30 psig and 2 SCFH flow rate.
9. Start the flow of span gas, before disconnecting the sample gas line, to purge the air trapped in the
span gas line – allow the span gas to flow for about 2 minutes.
10. Disconnect the sample gas line and replace it with the purged span gas line.
11. Wait 10-15 minutes to ensure the reading is stable (a premature adjustment will cause drift).
12. Allow the oxygen reading to stabilize. The analyzer would typically stabilize in 5-15 minutes.
13. Refer to Appendix A and advance the cursor (*) on the MAIN MENU to SPAN and press ENTER to
accept the selection.
14. From the SPAN menu advance the cursor (*) to Calibrate and press ENTER to select.
15. Follow the menus in Appendix A to enter and accept the span value.
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5 Operation
16. The analyzer returns to the SAMPLE mode after 30 seconds.
17. Before disconnecting the span gas line and connecting the sample gas line, restart if necessary the
flow of sample gas and allow it to flow for 1-2 minutes to purge the air inside the line.
18. Disconnect the span gas line and replace it with the purged sample gas line.
19. Wait 10-15 minutes to ensure the reading is stable and proceed to sampling.
20. Once calibrated, the analyzer is ready for Sampling.
Sampling
Procedure Following Span Calibration
1. Reconnect the sample gas line as described above (the analyzer returns to the SAMPLE
automatically).
2. Caution: Assure that the vent line is connected to a ¼” or larger tube and is vented to atmosphere,
with the magnification associated with the use of suppressed ranges even the slightest amount of
backpressure will adversely affect the oxygen reading.
3. Set the sample gas pressure between 5 and 30 psig (100 psig maximum to retain the precision
control of the flow from the flow control valve).
4. Set the sample gas flow rate to approximately 2 SCFH.
5. Advance the cursor (*) on the SAMPLE menu to select either AUTO or MANUAL RANGING
6. Press ENTER to accept the selection.
7. Allow the oxygen reading to stabilize, the analyzer would typically stabilize in 5-15 minutes.
Display Negative (Readings)
The analyzer provides the user with the option to choose whether they wish to display negative readings.
This feature is useful if the user prematurely zeroes the analyzer either inadvertently or knowingly during
a quick start situation.
Advance the cursor (*) on the MAIN MENU to SYSTEM and press ENTER to accept the selection.
From the above SYSTEM menu advance the cursor (*) to DISPLAY NEGATIVE and press ENTER to
select/toggle between ON and OFF (default). The default or OFF selection causes the analyzer to
automatically correct the reading displayed and the zero offset once a negative reading (signal) has been
detected for a constant 90 minutes.
Note: Prematurely zeroing the analyzer can cause the analyzer to display a negative reading in both the
ZERO and SAMPLE modes.
Depending on the magnitude of the zero offset and the oxygen value of the sample gas, the analyzer
may only display a reading of 00.0 (if the zero offset value exceeds the oxygen value of the gas). A
constant 00.0 reading suggests repeating the zero calibration procedure with DISPLAY NEGATIVE ON
(allowing sufficient time for the reading to stabilize) before concluding there is a problem with the
analyzer.
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5 Operation
To avoid damaging the sensor or sample system observe the following guidelines:
1. Drawing a vacuum on the sensor by pressurizing the analyzer: Results when sample gas flows into the
analyzer, builds up within the analyzer sample system because the SHUT OFF valve is closed or the outlet
vent is restricted, and, is suddenly released when the blockage is removed. This sudden release of
backpressure draws a vacuum on the sensor.
2. Drawing a vacuum on the sensor when using a sampling pump or eductor downstream of the
analyzer.
Special considerations include:
Sampling - before activating the pump or eductor, assure the FLOW valve and SHUT OFF valve are
completely open. Set the sample flow rate to 2 SCFH on the flow indicator by adjusting the PUMP
BYPASS valve.
Span calibration - deactivate the pump or eductor, set the span flow rate to 2 SCFH on the flow indicator
by adjusting the FLOW valve. After span calibration is complete, open the FLOW valve completely before
activating the pump or eductor.
Note: The vacuum generated in 1 or 2 above may exceed the recommended limit and stress the sensor’s
seals to the point of rupture causing the sensor to leak electrolyte (voiding the sensor warranty).
Electrolyte leakage may damage the electrical contacts of the upper section of the sensor housing
assembly (if not removed quickly) dictating replacement of the entire upper assembly.
3. Subjecting the analyzer to high positive pressure can damage the sensor, pumps or other flow system
components.
4. Introducing calibration span gas from a pressurized cylinder without pressure regulation: Results in an
inaccurate calibration and possible damage to the analyzer’s scrubber and pumps.
5. NEVER block the outlet vent of the sample gas on the side of the analyzer: This includes pressing your
finger over the outlet vent to confirm the flow indicator is operating.
6. The pressure at the vent outlet must be lower than the inlet pressure. Normally, the vent is at
atmospheric pressure. Otherwise a back pressure regulator may be required to stabilize the pressure at
the sensor.
Standby & Storage
The analyzer has no special storage requirements. If storing for an extended period of time, disconnect
the power to the analyzer.
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6 Maintenance
Periodically, the oxygen sensor will require replacement. The operating life is determined by a number of
factors that are influenced by the user and therefore difficult to predict. Cleaning the electrical contacts
when replacing the sensor is the extent of the maintenance requirements of this analyzer.
Serviceability: Except for replacing the oxygen sensor, there are no parts inside the analyzer for the
operator to service. Only trained personnel with the authorization of their supervisor should conduct
maintenance.
Caution: DO NOT open the oxygen sensor. The sensor contains a corrosive liquid electrolyte that could
be harmful if touched or ingested, refer to the Material Safety Data Sheet contained in the Owner’s
Manual appendix. Avoid contact with any liquid or crystal type powder in or around the sensor or sensor
housing, as either could be a form of electrolyte. Leaking sensors should be disposed of in accordance
with local regulations.
Sensor Replacement Procedure
1. Using the 5/16 wrench supplied loosen but do not
remove the clamp bolt.
2. Rotate the upper section of the sensor housing 90º to
disengage from the clamp.
3. Remove the upper section by pulling it straight up and
place it on a smooth surface.
4. Remove the old oxygen sensor and dispose of it in
accordance with local regulations for disposing of
batteries.
5. Remove the new oxygen sensor from the shipping bag.
6. Remove the red label and the gold ribbon (shorting
deveice) from the PCB at the rear of the sensor.
7. Caution: Minimize the time the sensor is exposed to
ambient air.
8. Place the new sensor in the bottom section of the sensor housing with the PCB facing up.
9. Place the upper section of the sensor housing over the sensor.
10. Gently push the upper section downward and rotate 90º to engage the clamp.
11. Finger tighten the clamp bolt
12. Tighten the clamp bolt it one full turn with the 5/16 wrench to compressed the o-ring seal.
13. Sensor replacement is complete proceed to Zero and Span Calibration.
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7 Spare Parts
Recommended spare parts for the GPR-3100 % High Purity O2 Analyzer include:
Item No.
GPR-11-120-OP Oxygen Sensor (standard)
Other spare parts
CTRL-1002 Temperature Controller (Love)
CTRL-1003 Temperature Controller (Dwyer)
CTRL-1004 Temperature Controller (Fuji)
HTR-1002 Heater 110 VAC
HTR-1003 Heater 220 VAC
A-1004-1-24 Housing Sensor Stainless Steel
MTR-1011 Meter LCD Digital Display
A-1146-E-50 PCB Assembly Micro-processor / Display
A-1147-E-50 PCB Assembly Power Supply / Interconnection
SNSR-1001 RTD Temperature Sensor
SNSR-1002 Runaway Protector J-2
TOOL-1001 5/16 Wrench Combination
Description
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8 Troubleshooting
Symptom Possible Cause Recommended Action
Reading does not
reflect expected values
Oxygen reading drifts
toward zero or
significant number of
turns of the span
control adjustment is
required to calibrate the
analyzer.
Slow response time
Erratic oxygen reading
No oxygen reading
Sensor was not calibrated at the
pressure, flow rate and temperature
anticipated in the sample gas stream
Indication sensor is nearing the end of
its useful life
Liquid covering sensing membrane
Presence of interference gases.
Unauthorized maintenance
Defective electrical connection
Sensor failure
Recalibrate the analyzer
Replace sensor, see Section 6 Maintenance.
Gently remove with alcohol and
lint free towel.
Consult factory, replace sensor,
see Section 6 - Maintenance.
Use voltmeter and determine uA or
mV output and contact factory.
High oxygen reading
8
Inadequate control of pressure and
flowrate
Abnormality in span gas
See Section 5 - Operation,
Getting Started,
Control of Pressure and Flow
Qualify source
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9 Warranty
What is covered:
Any defect in material and workmanship from normal use in accordance with the Owner’s Manual.
This warranty applies to all analyzers purchased worldwide. Advanced Instruments Inc. reserves the right
in it’s sole discretion to invalidate this warranty if the serial number does not appear on the analyzer.
For how long:
One year from shipment by manufacturer or purchase from a distributor with proof of purchase.
Who is warranted:
This warranty is limited to the first customer who submits a claim. Under no circumstances will the
warranty extend to more than one customer.
What we will do:
If your Advanced Instruments Inc. analyzer is defective with respect to material and workmanship, we
will repair it or, at our option, replace it at no charge to you.
If we choose to replace your Advanced Instruments Inc. analyzer, we may use new or reconditioned
replacement parts.
If we choose to replace your Advanced Instruments Inc. analyzer, we may replace it with a new or
reconditioned one of the same or upgraded design.
Limitations:
Implied warranties, including those of fitness for a particular purpose and merchantability (an unwritten
warranty that the product is fit for ordinary use), are limited to one year from the date of shipment by
manufacturer or purchase from a distributor with proof of purchase.
Advanced Instruments Inc. will not pay for: loss of time; inconvenience; loss of use of your Advanced
Instruments Inc. analyzer or property damage caused by your Advanced Instruments Inc. analyzer or its
failure to work; any special, incidental or consequential damages; or any damage resulting from
alterations, misuse or abuse; lack of proper maintenance; unauthorized repair or modification of the
analyzer; affixing of any attachment not provided with the analyzer or other failure to follow the Owner’s
Manual.
Some states and provinces do not allow limitations on how an implied warranty lasts or the exclusion of
incidental or consequential damages, so the above exclusions may not apply to you. This warranty gives
you specific legal rights, and you may also have other rights which vary from state to state and province
to province.
Rev 9/2002 9 1 of 2
Advanced Instruments Inc.
9 Warranty
What is not covered:
This warranty does not cover installation; defects resulting from accidents; damage while in transit to our
service location; damage resulting from alterations, misuse or abuse; lack of proper maintenance;
unauthorized repair or modification of the analyzer; affixing of any attachment not provided with the
analyzer; fire, flood, or acts of God; or other failure to follow the Owner’s Manual.
Sole Warranty
This warranty is the only one we will give on your Advanced Instruments Inc. analyzer, and it sets forth
all our responsibilities regarding your Advanced Instruments Inc. analyzer.
There are no other express warranties.
How to obtain warranty service:
Do-It-Yourself-Service
Call Advanced Instruments Inc. at 909-392-6900 between 8:00am and 5:00pm Pacific Time weekdays.
Trained technicians will assist you in diagnosing the problem and arrange to supply you with the required
parts.
Service from Distributors
If warranty service is provided by a distributor, Advanced Instruments Inc. will provide all required parts
under warranty at no charge to you, but the distributor is an independent business and may render a
service charge for their services. Advanced Instruments Inc. will not reimburse you or otherwise be
responsible for those charges.
Return to Advanced Instruments Inc.
You may obtain warranty service by returning you analyzer, postage prepaid to:
Advanced Instruments Inc.
2855 Metropolitan Place
Pomona, Ca 91767 USA
Be sure to pack the analyzer securely. Include your name, address, telephone number, proof of date of
purchase and a description of the operating problem. After repairing or, at our option, replacing your
Advanced Instruments Inc. analyzer, we will ship it to you at no cost for parts and labor.
Your choice of any one of the service options described above is your exclusive remedy under this
warranty.
Rev 9/2002 9 2 of 2
Advanced Instruments Inc.
10 Material Safety Data Sheet (MSDS)
Product Identification
Product Name Oxygen Sensor Models CAD, GPR, PSR, SAF, 67013
Synonyms Galvanic Fuel Cell, Electrochemical Transducer
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.
Information applies to electrolyte unless otherwise noted.
Specific Generic Ingredients
Carcinogens at levels > 0.1% None
Others at levels > 1.0% Potassium Hydroxide, Lead
CAS Number Potassium Hydroxide = KOH 1310-58-3, Lead = Pb 7439-92-1
Chemical (Synonym) and Family Potassium Hydroxide (KOH) - Base, Lead (Pb) - Metal
General Requirements
Use Potassium Hydroxide - electrolyte, Lead - anode
Handling Rubber or latex gloves
Safety glasses
Storage Indefinitely
Physical Properties
Boiling Point Range
Melting Point Range
Freezing Point
Molecular Weight KOH = 56, Lead = 207
Specific Gravity
Vapor Pressure Not applicable
Vapor Density Not applicable
pH > 14
Solubility in H
% Volatiles by Volume None
Evaporation Rate Similar to water
Appearance and Odor Colorless, odorless aqueous solution
O Complete
2
100 to 115° C
KOH -10 to 0° C, Lead 327° C
-40 to 0° C
1.09 @ 20° C
GPR/PSR 10
Advanced Instruments Inc.
10 Material Safety Data Sheet (MSDS)
Fire and Explosion Data
Flash and Fire Points Not applicable
Flammable Limits Not flammable
Extinguishing Method Not applicable
Special Fire Fighting Procedures Not applicable
Unusual Fire and Explosion Hazards Not applicable
Reactivity Data
Stability Stable
Conditions Contributing to Instability None
Incompatibility Avoid contact with strong acids
Hazardous Decomposition Products None
Conditions to Avoid None
Spill or Leak
Steps if material is released ¾ Sensor is packaged in a sealed protective plastic bag,
check the sensor inside for electrolyte leakage.
¾ If the sensor leaks inside the protective 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.
¾ Flush or wipe all surfaces repeatedly with water or wet
paper towel. Use a fresh towel each time.
Waste Disposal Method In accordance with federal, state and local regulations
Health Hazard Information
Primary Route(s) of Entry Ingestion, eye and skin contact
Exposure Limits Potassium Hydroxide - ACGIH TLV 2 mg/cubic meter
Lead - OSHA PEL .05 mg/cubic meter
Effects of Exposure -
Ingestion Electrolyte could be harmful or fatal if swallowed.
Oral LD50 (RAT) = 2433 mg/kg
Eye Electrolyte is corrosive and eye contact could result in
permanent loss of vision.
Skin Electrolyte is corrosive and skin contact could result in a
chemical burn.
Inhalation Liquid inhalation is unlikely.
GPR/PSR 10
Advanced Instruments Inc.
10 Material Safety Data Sheet (MSDS)
Symptoms Eye contact - burning sensation.
Skin contact - soapy slick feeling.
Medical Conditions Aggravated None
Carcinogenic Reference Data NTP Annual Report on Carcinogens - not listed
LARC Monographs - not listed
OSHA - not listed
Other Lead is listed as a chemical known to the State of California to
cause birth defects or other reproductive harm.
Emergency First Aid
Ingestion Do not induce vomiting.
Give plenty of cold water.
Seek medical attention immediately.
Skin Contact Wash affected area repeatedly with plenty of water.
Remove contaminated clothing.
If burning persists, seek medical attention.
Eye Contact Flush repeatedly with plenty of water for at least 15 minutes.
Seek medical attention immediately.
Inhalation Liquid inhalation is unlikely.
Special Protection Information
Ventilation Requirements None
Eye Safety glasses
Hand Rubber or latex gloves
Respirator Type Not applicable
Other Protective Equipment None
Special Precautions
Precautions Do not remove the sensor’s protective Teflon and PCB coverings.
Do not probe the sensor with sharp objects.
Wash hands thoroughly after handling.
Avoid contact with eyes, skin and clothing.
Empty sensor body may contain hazardous residue.
Transportation Not applicable
GPR/PSR 10
5 Operation - Appendix A
* MAIN MENU Sample
Sample
Span
Zero
Alarm
System
Auto Range 90 to 100 %
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MAIN MENU Sample SAMPLE Sample * MAIN MENU Sample
* Sample * Auto Ranging (default) Sample
Span Manual Ranging Span
Zero Zero
Alarm Alarm
System System
Auto Range 90 to 100 % Auto Range 90 to 100 % Auto Range 90 to 100 %
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Move cursor (*) to Sample using DOWN ARROW key Press ENTER to select
Press ENTER to select Returns to MAIN MENU
Note: Returns to MAIN MENU if no entry within 30 seconds
99.55 %
99.55 % 99.55 %
SAMPLE Sample MAN RANGE Sample * MAIN MENU Sample
Auto Ranging (default) * 90 to 100% Sample
* Manual Ranging 80 to 100% Span
50 to 100% Zero
0 to 100% Alarm
System
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99.55 %
5_ops_3100_menu 11/22/2005 Page 1 of 7
Auto Range 90 to 100 % Auto Range 90 to 100 % Man Range 90 to 100 %
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Move cursor (*) to Manual Ranging using DOWN ARROW key Move cursor (*) to desired Man Range using DOWN ARROW key
Press ENTER to select Press ENTER to select
Returns to MAIN MENU
Advanced Instrtuments Inc.
5 Operation - Appendix A
* MAIN MENU Sample
Sample
Span
Zero
Alarm
System
Auto Range 90 to 100 %
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MAIN MENU Sample SPAN Sample * MAIN MENU Sample
Sample * Factory Default (1) Sample (1) SPAN menu, Factory Default option * Span Calibrate Span Purpose is to reset the microprocessor as the first step in
Zero Zero troubleshooting perceived abnormalities. The span value
Alarm Alarm (which may be compromised) is reset using an average
System System sensor output value to temporarily assess the analyzer's
Auto Range 90 to 100 % Auto Range 90 to 100 % Auto Range 90 to 100 %
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Move cursor (*) to Span using DOWN ARROW key Move cursor (*) to Factory Default using DOWN ARROW key
Press ENTER to select Press ENTER to select
Note: Returns to MAIN MENU if no entry within 30 seconds
99.55 %
99.55 % 99.55 %
Activates (1) and returns to MAIN MENU
SPAN Sample Span Gas Sample 100.00 % Sample * MAIN MENU Sample
Factory Default Enter as PPB * Sample
* Calibrate Enter as PPM Press Up or Down Span
* Enter as % to change value (2) Zero
performance. Calibration is required upon completion.
Enter to Save Alarm
ESC to Return System
99.55 %
5_ops_3100_menu 11/22/2005 Page 2 of 7
Auto Range 90 to 100 % Auto Range 90 to 100 % Auto Range 90 to 100 % Auto Range 90 to 100 %
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Move cursor (*) to Calibrate using DOWN ARROW key Move cursor (*) to desired Man Range using DOWN ARROW key (2) To change value of 1st digit.
Press ENTER to select Press ENTER to select Press ENTER to advance cursor (*) to 2nd digit
Returns to MAIN MENU Press Up or Down to change value
Repeat as necessary for remaining digits
Advanced Instrtuments Inc.
5 Operation - Appendix A
* MAIN MENU Sample
Sample
Span
Zero
Alarm
System
Auto Range 90 to 100 %
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MAIN MENU Sample ZERO Sample * MAIN MENU Sample
Sample * Factory Default (3) Sample (3) ZERO menu, Factory Default option Span Calibrate Span Purpose is to reset the microprocessor as the first step in
* Zero Zero troubleshooting perceived abnormalities. The zero value
Alarm Alarm (which may be compromised) is reset using an average
System System sensor output value to temporarily assess the analyzer's
Auto Range 90 to 100 % Auto Range 90 to 100 % Auto Range 90 to 100 %
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Move cursor (*) to Zero using DOWN ARROW key Move cursor (*) to Factory Default using DOWN ARROW key
Press ENTER to select Press ENTER to select
Note: Returns to MAIN MENU if no entry within 30 seconds
99.55 %
99.55 % 99.55 %
Activates (1) and returns to MAIN MENU
ZERO Sample * MAIN MENU Sample
Factory Default Sample
* Calibrate Span
Auto Range 90 to 100 % 6.50 % Auto Range 0 to 100 %
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Move cursor (*) to Calibrate using DOWN ARROW key Press ENTER to select Calibrate (4) Above display remains until ppm oxygen value reaches
Press ENTER to select 6% of analyzer's lowest range. Adjustment is made and
ZERO
CALIBRATION
IN
PROGRESS
performance. Zero calibration is required upon completion.
ZERO
CALIBRATION
IN
PROGRESS
returns to MAIN MENU
Zero
Alarm
System
00.05 %
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* MAIN MENU Sample
ZERO
CALIBRATION
IN
CALIBRATION
FAILED
Sample
Span
Zero
Alarm
System
PROGRESS
Enter to Cal, ESC to Abort 75F 101 Kpa 02/10/2004 17:32:48
Press ESC to select Abort Timesout and returns to MAIN MENU
Auto Range 90 to 100 %
99.55 %
Advanced Instrtuments Inc.
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5 Operation - Appendix A
* MAIN MENU Sample
Sample
Span
Zero
Alarm
System
Auto Range 90 to 100 %
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MAIN MENU Sample ALARM Sample 40% Sample * MAIN MENU Sample
Sample * Set Alarm 1 Press Up or Down Sample
Span Set Alarm 2 to change valu
Zero Alarm 1 Hi ENTER to Save Zero
* Alarm Alarm 2 Hi ESC to Return Alarm
System Alarm 1 On System
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Move cursor (*) to Alarm using DOWN ARROW ke
Press ENTER to selec
Note: Returns to MAIN MENU if no entry within 30 second
99.55 %
99.55 %
uto Range 90 to 100 %
Span
Alarm 2 On
Alarm Timeou
uto Range 90 to 100 %
Move cursor (*) to Alarm 1 using DOWN ARROW ke
Press ENTER to selec
ALARM Sample 20% Sample * MAIN MENU Sample
Set Alarm 1 Press Up or Down Sample
* Set Alarm 2 to change valu
Alarm 1 Hi ENTER to Save Zero
Alarm 2 Hi ESC to Return Alarm
Alarm 1 On System
Alarm 2 On
Alarm Timeou
uto Range 90 to 100 %
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Move cursor (*) to Alarm 2 using DOWN ARROW ke
Press ENTER to selec
ALARM Sample * MAIN MENU Sample
Set Alarm 1 Sample
Set Alarm 2 Span
* Alarm 1 Hi Press ENTER to toggle between Hi and Lo or On and Of
* Alarm 2 Hi Returns to MAIN MENU after toggling Alarm
* Alarm 1 On User does not see change, e.g. user must go back to confirm change
* Alarm 2 On
Alarm Timeou
uto Range 90 to 100 %
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Move cursor (*) to each of 4 selections individually using DOWN ARROW ke
Press ENTER to selec
ALARM Sample 10 Minutes Sample * MAIN MENU Sample
Set Alarm 1 Press Up or Down Sample
Set Alarm 2 to change valu
Alarm 1 Hi ENTER to Save Zero
Alarm 2 Hi ESC to Return Alarm
Alarm 1 On System
Alarm 2 On
* Alarm Timeou
uto Range 90 to 100 %
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Move cursor (*) to Alarm Timeout using DOWN ARROW ke
Press ENTER to selec
uto Range 90 to 100 %
Press ENTER to Save or ESC to return to MAIN MENU
uto Range 90 to 100 %
Press ENTER to Save or ESC to return to MAIN MENU
uto Range 90 to 100 %
Press ENTER to Save or ESC to return to MAIN MENU
99.55 %
uto Range 90 to 100 %
Span
99.55 %
uto Range 90 to 100 %
Zero
System
Span
99.55 %
uto Range 90 to 100 %
99.55 %
uto Range 90 to 100 %
5_ops_3100_menu 11/22/2005 Page 4 of 7
5 Operation - Appendix A
* MAIN MENU Sample
Sample
Span
Zero
Alarm
System
Auto Range 90 to 100 %
75F 101 Kpa 02/10/2004 17:32:48
99.55 %
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5_ops_3100_menu 11/22/2005 Page 5 of 7
5 Operation - Appendix A
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* MAIN MENU Sample
Sample
Span
Zero
Alarm
System
Auto Range 90 to 100 %
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MAIN MENU Sample * SYSTEM
Sample Enable Low Flow Alarm If active, press ENTER to toggle between Enable and Disabl
Span Disable Alarm During Cal Press ENTER to toggle between Enable and Disabl
Zero Signal Average Low, Medium or High (default Medium) - response time vs. noise filterin
Alarm Range Same as SAMPLE, Manual Ranging abov
* System Logging Interval
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Move cursor (*) to Systemusing DOWN ARROW ke
Press ENTER to selec
Note: Returns to MAIN MENU if no entry within 30 second
99.55 %
99.55 %
uto Range 90 to 100 % Logging On Press ENTER to toggle between On and Off
Temp co-efficien
View Data Graph Fullscreen display of data points - provided Logging O
Set Clock (and Date)
Display Negative (Reading) On Press ENTER to toggle between On and Off
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Move cursor (*) to desired selection using DOWN ARROW ke
Not active at this tim
Press ENTER to toggle between MAIN MENU display options - 1.) menu text with large numbers or 2.) menu text with small number and grap
11 Minutes
Press Up or Down
to change valu
ENTER to Save
ESC to Return
Advanced Instrtuments Inc.
75F 101 Kpa 02/10/2004 17:32:48
Press ENTER to Save and return to SYSTEM menu
Press ESC to Return to SYSTEM menu
SET CLOCK * SET CLOCK * MAIN MENU Sample
* Set Time Set Hou
Set Dat
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Move cursor (*) to desired selection using DOWN ARROW ke
Press ENTER to selec
Move cursor (*) to desired selection using DOWN ARROW ke
Press ENTER to selec
Press UP or DOWN arrows to change valu
5_ops_3100_menu 11/22/2005 Page 6 of 7
Set Minut
Set Second Zero
Move cursor (*) to desired selection using DOWN ARROW ke
Press ENTER to selec
Press UP or DOWN arrows to change valu
Returns to MAIN MENU
Repeat for each selection optio
* SET DATE * MAIN MENU Sample
Set Yea
Set Month Span
Set Da
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Sample
Span
Alarm
System
Sample
Zero
Alarm
System
99.55 %
uto Range 90 to 100 %
99.55 %
uto Range 90 to 100 %
5 Operation - Appendix A
n
* MAIN MENU Sample
Sample
Span
Zero
Alarm
System
Auto Range 90 to 100 %
75F 101 Kpa 02/10/2004 17:32:48
99.55 %
Returns to MAIN MENU
Repeat for each selection optio
Advanced Instrtuments Inc.
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