AII GPR-1500 DA User manual

2855 Metropolitan Place, Pomona, CA 91767 USA ♦Tel: [phone], Fax: [phone], www.aii1.com, e-mail: [email protected] Rev 10/15
Technical Specifications *
Accuracy: < 2% of FS range under constant conditions
Analysis: 0-100, 0-1000 PPM, 0-1%, 0-25% (CAL) FS
Auto-ranging or manual lock on a single range
Application: Oxygen analysis in inert, hydrocarbon, helium, hydrogen,
mixed and acid (CO2) gas streams
Area Classification: General purpose
Alarms: Two user configurable alarms: magnetic coil relays rated
3A at 100 VAC, field programmable alarm time delays,
alarm bypass for calibration and system fail alarm
Calibration: Max interval—3 months. Use certified span gas with O2
content (balance N2) approximating 80% of full scale for
fast 20-30 minute recovery to online use. Alternatively,
air calibrate with clean source of compressed or ambient
(20.9% O2) air on 0-25% range and allow 60 minutes on
zero gas to recover to 10 ppm. For optimum accuracy,
calibrate one range higher than the range of interest.
Compensation: Barometric pressure and temperature
Connections: 1/8" compression tube fittings
Controls: Water resistant keypad; menu driven range selection,
calibration and system functions
Display: Graphical LCD 2.75” x 1.375”; resolution 0.01 PPM; dis-
plays real time ambient temperature and pressure
Enclosure: Fiberglass NEMA 4X, 6.75 x 8.375 x 4.25", 8 lbs.
Flow Sensitivity: Not flow sensitive, 1-2 SCFH recommended
Linearity: ±1% of full scale
Pressure: Inlet - regulate to 5-30 psig to deliver 1-2 SCFH flow;
vent - atmospheric
Power: 12-28 VDC non-loop or 110-220 VAC
Recovery Time: 30 seconds in air to < 100 PPM in < 15 mins on N2purge
Response Time: 90% of final reading in 10 seconds
Sample System: None
Sensitivity: < 0.5% of FS range
Sensor Model: GPR-12-100-M for non-acid (CO2) gas streams;
XLT-12-100-M for gases containing > 0.5% CO2
Sensor Life: 24 months in < 1000 PPM O2 at 25ºC and 1 atm
Signal Output: 4-20mA non-isolated or 1-5V; optional Modbus Commu-
nication
Operating Range: 5ºC to 45ºC (GPR sensor), -10ºto 45ºC (XLT sensor)
Warranty: 12 months analyzer; 12 months sensor
Wetted Parts: Stainless steel
Optional Equipment
Sample conditioning system - Contact factory.
* Subject to change without notice
GPR-1500 DA
PPM Oxygen Analyzer
12-28 VDC Non-Loop or 110-220 VAC
Powered Oxygen Analyzer
Advanced Galvanic Sensor Technology with
Optional Sample Systems
2 Field Selectable Alarm Setpoints
12-28 VDC or 110-220 VAC Power
4-20 mA or 1-5V Signal Output
Sensitivity 0.5% Full Scale
4 Ranges Standard
Auto Ranging or Single Fixed
Stainless Steel Wetted Parts
ISO 9001:2008 Certified
INTERTEK Certificate No. 485

GPR-1500 DA
ppm Oxygen Transmitter
Owner’sManual
2855 Metropolitan Place, Pomona, CA 91767 USA ♦Tel: [phone], Fax: [phone], e-mail: [email protected], www.aii2.com

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TableofContents
Introduction 1
Quality Control Certification 2
Safety 3
Features & Specifications 4
Operation 5
Maintenance 6
Spare Parts 7
Troubleshooting 8
Warranty 9
Material Safety Data Sheets 10
Drawings A/R

3
1 Introduction
Your new oxygen transmitter incorporated an advanced electrochemical sensor specific to oxygen along with state-
of-the-art digital electronics designed to give you years of reliable precise oxygen measurements in variety of
industrial oxygen applications.
To obtain maximum performance from your new oxygen transmitter, please read and follow the guidelines
provided in this Owner’s Manual.
Every effort has been made to select the most reliable state of the art materials and components, to design the
transmitter for superior performance and minimal cost of ownership. This transmitter was tested thoroughly by the
manufacturer prior to shipment 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 transmitter is your assurance that we stand behind every
transmitter sold.
The serial number of this transmitter may be found on the inside the transmitter. 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: _______________________
Advanced Instruments Inc. appreciates your business and pledges to make every effort to maintain the highest
possible quality standards with respect to product design, manufacturing and service.

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2 QualityControlCertification
Date: Customer: Order No.: Pass
Model: GPR-1500 DA ppm Oxygen Transmitter
Sensor: ( ) GPR-12-100-M ppm Oxygen Sensor
( ) XLT-12-100-M ppm Oxygen Sensor
Serial Nos.: Transmitter ______________________ Sensor ______________________
Accessories: Owner’s Manual
Configuration: A-1151-E-A4 PCB Assembly Main Processing
A-1153-A-A4 PCB Assembly Alarms/Power Connection
Software rev:
Ranges: 0-100, 0-1000 ppm, 0-1%, 0-25%
Power: 12-36V DC two wire loop power
Barometric pressure and temperature compensation
NEMA 4X rated wall mount enclosures
Test: Pass Pass
Set default zero
Set default span @ 600uA or 300uA Alarm delay
Zero calibration Alarm bypass
Span Calibration Alarm configurations; ALARM 1, ALARM 2
Analog signal output 4-20mA full scale Alarm function; ALARM 1, ALARM 2
Calibrates with adequate span adjustment within 10-50% FS Alarm relays; ALARM 1, ALARM 2
Baseline drift on zero gas < ±2% FS over 24 hour period Alarm system fail, dry contact
Noise level < ±1.0% FS Overall inspection for physical defects
Options:
Notes:

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3 Safety
General
This section summarizes the essential precautions applicable to the GPR-1500DA ppm Oxygen Transmitter.
Additional precautions specific to individual transmitter are contained in the following sections of this manual. To
operate the transmitter 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 transmitter 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 transmitter, 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 transmitter.
PressureandFlow
Inlet Pressure: GPR-1500DA ppm Oxygen Transmitters are designed for flowing samples, equipped with 1/8”
bulkhead tube fitting connections on the side of the unit (unless otherwise indicated, either fitting can serve as inlet
or vent) and are intended to operate at positive pressure regulated to between 5-30 psig.
Caution: If equipped with a H2S scrubber as part of an optional sample conditioning system, inlet pressure must
not exceed 30 psig.
Outlet Pressure: The sample gas vent pressure should be atmospheric.
Installation
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 transmitter is approved for indoor or outdoor use. Mount as recommended by the manufacturer.
Power: Supply power to the transmitter only as rated by the specification or markings on the transmitter
enclosure. The wiring that connects the transmitter 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 transmitter. Never yank wiring to remove it from an outlet or from the transmitter.
Operating Temperature: The maximum operating temperature is 45º C.
Heat: Situate and store the transmitter away from sources of heat.
Liquid and Object Entry: The transmitter 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 transmitter.

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Handling: Do not use force when using the switches and knobs. Before moving your transmitter be sure to
disconnect the wiring/power cord and any cables connected to the output terminals located on the transmitter.
Maintenance
Serviceability: Except for replacing the oxygen sensor, there are no parts inside the transmitter 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 transmitter is faulty.
Do not attempt to service the transmitter 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 10 and may result in electrical shock, injury or
damage. All other servicing should be referred to qualified service personnel.
Cleaning: The transmitter 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: If the transmitter is equipped with a range switch advance the switch to the OFF position and
disconnect the power when the transmitter is left unused for a long period of time.
4 Features & Specifications
See last page, this page left blank intentionally.

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5 Operation
PrincipleofOperation
The GPR-1500DA oxygen transmitter incorporates a variety of ppm range advanced galvanic fuel cell type sensors.
The transmitter is configured in two sections. The transmitter is a compact efficient package configured with the
oxygen sensor and separate circuit boards for signal processing and terminals for incoming power, power supply,
signal output and alarm relay contacts housed in a general purpose NEMA 4X rated enclosure.
Advanced Galvanic Sensor Technology:
The sensors 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. Sample oxygen is analyzed very accurately. Response time of 90% of
full scale is less than 10 seconds (actual experience may vary due to the integrity of sample line connections, dead
volume and flow rate selected) on all ranges under ambient monitoring conditions. Sensitivity is typically 0.5% of
full scale low range. Oxygen readings may be recorded by an external device via the 0-1V signal output jack.
The circuit for the 4-20mA signal output and two adjustable alarms is powered by a DC/DC transformer that
requires a 12-36VDC power source and separate wiring for the outputs. A loop power source is not sufficient to
power to the circuit. The 4-20mA output is also represented on full scale oxygen readings to an external device.
Sample System:
The GPR-1500DA is supplied without a sample conditioning system thereby giving users the option of adding their
own or purchasing a factory designed sample conditioning system. Whatever the choice, the sample must be
properly presented to the sensor to ensure an accurate measurement. Users interested in adding their own sample
conditioning system should consult the factory. 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
[email protected]

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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.
Flow Through Configuration:
The sensor is exposed to sample gas that must flow or be drawn through
metal tubing inside the transmitter. The GPR-1500DA internal sample system
includes 1/8” compression tube inlet and vent fittings, a stainless steel sensor
housing with an o-ring seal to prevent the leakage of air and stainless steel
tubing.
Flow rates of 1-5 SCFH cause no appreciable change in the oxygen reading.
However, flow rates above 5 SCFH generate backpressure and erroneous
oxygen readings because the diameter of the integral tubing cannot evacuate
the sample gas at the higher flow rate. The direction the sample gas flows is
not important, thus either tube fitting can serve as the inlet or vent – just not
simultaneously.
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).
To avoid generating a vacuum on the sensor (as described above) during operation, always select and install the
vent fitting first and remove the vent fitting last.
Application Pressure - Positive:
A flow indicator with integral metering valve positioned upstream of the sensor is recommended
for controlling the sample flow rate between 1-5 SCFH. To reduce the possibility of leakage for low
ppm measurements, position a metering needle valve upstream of the sensor to control the flow
rate and position a flow indicator downstream of the sensor.
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.
Caution: If equipped with a H2S scrubber as part of an optional sample conditioning system, inlet
pressure must not exceed 30 psig.
Application Pressure - Atmospheric or Slightly Negative:
For accurate ppm range oxygen measurements, an optional external sampling pump should be positioned
downstream of the sensor to draw the sample from the process, by the sensor and out to atmosphere. A flow
meter is generally not necessary to obtain the recommended flow rate with most sampling pumps.
Caution: If the transmitter is equipped with an optional flow indicator with integral metering valve or a metering
flow control valve upstream of the sensor - open the metering valve completely to avoid drawing a vacuum on the
sensor and placing an undue burden on the pump.

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If pump loading is a consideration, a second 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.
To avoid erroneous oxygen readings and damaging the sensor:
¾Do 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).
¾Assure there are no restrictions in the sample or vent lines
¾Avoid drawing a vacuum that exceeds 14” of water column pressure – unless done gradually
¾Avoid excessive flow rates above 5 SCFH which generate backpressure on the sensor.
¾Avoid sudden releases of backpressure that can severely damage the sensor.
¾Avoid the collection of particulates, liquids or condensation collect on the sensor that could block the diffusion
of oxygen into the sensor.
¾If the transmitter is equipped with an optional integral sampling pump (positioned downstream of the sensor)
and a flow control metering valve (positioned upstream of the sensor), completely open the flow control
metering valve to avoid drawing a vacuum on the sensor and placing an undue burden on the pump.