AII GPR-18 User manual

2855 Metropolitan Place, Pomona, CA 91767 USA ♦Tel: [phone], Fax: [phone], www.aii1.com, e-mail: [email protected] Rev 10/15
ISO 9001:2008 Certified
INTERTEK Certificate No. 485
GPR-1800 IS
PPM Oxygen Transmitter
Loop Powered PPM O2 Transmitter
Optional Modular Sample Systems
Technical Specifications *
Accuracy: < 2% of FS range under constant conditions
Analysis: 0-10, 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, hydro-
gen, mixed and acid (CO2) gas streams
Approvals: Certified for use in hazardous areas - see lower right
UL: United States: UL 1203, UL 913, UL 508
Canada: CAN/CSA C22.2 No. 30-M1986,
CAN/CSA C22.2 No. 157-92,
CAN/CSA C22.2 No. 14-10
ATEX: Directive 94/9/EC
Area Classification: Certified for use in hazardous areas - see lower right
Alarms: None
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. Alterna-
tively, 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 opti-
mum accuracy, calibrate one range higher than the
range of interest.
Compensation: 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;
displays real time ambient temperature and pressure
Enclosure: NEMA Type 3R suitable for rain in outdoor applications
Flow: Not flow sensitive; recommended flow rate 1-2 SCFH
Linearity: ±1% of full scale
Pressure: Inlet - regulate to 5-30 psig to deliver 1-2 SCFH flow;
vent - atmospheric
Power: 18-24 VDC
Response Time: 90% of final reading in 10 seconds
Sample System: Sample flow meter; options available, see other side
Sensitivity: < 0.5% of FS range
Sensor Model: GPR-12-333 for non-acid (CO2) gas streams
XLT-12-333 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
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 systems (see back page) - Contact factory
* Specifications subject to change without notice
Exia
UL Certified
File E343386
Class I, Division 1, Groups C and D
T4 Tamb -20⁰C to +50⁰C
0080
ATEX Certified - Directive 94/9/EC
Examination Cert: INERIS 07ATEX0025X
II 2 G
Ex d [ib] ib IIB T4 Gb
Tamb –20ºC to +50ºC
UL or ATEX Certified for Hazardous Areas

Advanced Instruments Inc.
2855 Metropolitan Place, Pomona, California 91767 USA ♦ Tel: [phone], Fax: [phone], e-mail:
[email protected]
GPR1800IS
PPMOXYGENANALYZER
Shown with optional Sampling System
Owner'sManual
Revised Sep 16,, 2015

Advanced Instruments, Inc
2
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 1
0
Drawings A
/
R
Explosion Proofing Electrical Connections Appendix A
Correlating readings – LCD display to 4-20mA signal Appendix B
output
H2S Scrubber, Sample System, Media MSDS Appendix F
Maintenance H2S Scrubber & Coalescing Filter Appendix G
ppendices referenced above are an integral part of the documentation, installation and maintenance of this anaThe a lyzer
to comply with all applicable directives. It is important that users review these documents before proceeding.

Advanced Instruments, Inc
3
1. Introduction
Your new oxygen analyzer incorporates 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 a variety of industrial oxygen
applications. More importantly, it has been constructed as explosion proof/intrinsically safe in accordance with Safety
Standards: UL 913 Seventh Edition, Referencing UL 60079-0:2005 and UL 60079-11:2009 and CSA C22.2 No. 157-92
Third Edition for use in Class I, Div 1, Groups C and D hazardous locations and the ATEX Directives 94/9/EC for zone 1
Group IIB.
Analytical Industries Inc.
dba Advanced Instruments Inc.
2855 Metropolitan Place, Pomona, CA 91767 USA
GPR-1800 IS/2800 IS
0080
Serial No.:
Year of Manufacture:
INERIS 08ATEX0036
II 2 G
Ex d IIB T4 Gb
Tamb -20⁰C to +50⁰C
WARNING: POTENTIAL ELECTROSTATIC CHARGING HAZARD – SEE
INSTRUCTIONS
Please refer to Appendix A for making electrical connections that maintains the desired level of protection.
To obtain maximum performance from your new oxygen analyzer, 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 analyzer for
superior performance and minimal cost of ownership. This analyzer 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 analyzer may be found on the inside the analyzer enclosure. 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.

Advanced Instruments, Inc
4
3.GeneralSafety&Installation
This section summarizes the essential precautions applicable to the GPR-1500 IS Oxygen Analyzer. 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.
Warning: This symbol is used throughout the Owner’s Manual to Warn and alert the user of the presence of
electrostatic discharge.
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.
Analyzer label ULc
WARNING – Potential Explosion Hazard: The devices are not intended for use in atmospheres or with sample gas streams
containing oxygen concentration greater than 21 percent by volume (ambient air) and are only intended for use in gases or
gas mixtures classified as Class I, Div 1, Groups C and D hazardous locations or in non-hazardous locations, when used in
the United States or Canada.

Advanced Instruments, Inc
5
2.QualityControlCertification
See packing slip

Advanced Instruments, Inc
6
Maintenance
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.
WARNING- Substitution of Components May Impair Intrinsic Safety
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 10 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: If the analyzer 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.
Installation
This analyzer has been constructed in compliance with
EN 60079-0 : 2009
EN 60079-1 : 2007
EN 60079-11 : 2012
For USA and Canada
UL 913, 7th Edition
CSA C22.2 No. 157-92
It must be installed in accordance with
EN 60079-14
For USA - NEC and Canada – CEC Standards
WARNING - Potential Explosion Hazard – See Warning in Section 4 – Features and Specifications
Gas Sample Stream: Ensure the gas stream composition of the application is consistent with the specifications and
if in doubt, review the application and consult the factory before initiating the installation. Note: In natural gas applications
such as extraction and transmission, a low voltage current is applied to the pipeline itself to inhibit corrosion of the pipeline.
As a result, electronic devices connected to the pipeline can be affected unless they are adequately grounded.
Contaminant Gases: A gas scrubber and flow indicator with integral metering valve are required upstream of the
analyzer to remove any interfering gases such as oxides of sulfur and nitrogen or hydrogen sulfide that can interfere with
measurement and cause reduction in the expected life of the sensor. Consult the factory for recommendations concerning
the proper selection and installation of components.
Expected Sensor Life: With reference to the publish specification located at the last page of this manual, the
expected life of all oxygen sensors is predicated on oxygen concentration (< 1000 PPM for trace sensor or air for %
sensor), temperature (77°F/25°C) and pressure (1 atmosphere) in “normal” applications. Deviations from standard
conditions will affect the life of the sensor. As a rule of thumb sensor life is inversely proportional to changes in the
pressure and temperature.
Accuracy & Calibration: Refer to section 5 Operation.
Materials: Assemble the necessary zero, sample and span gases and optional components such as valves, coalescing
or particulate filters, and pumps as dictated by the application. Stainless steel tubing is essential for maintaining the
integrity of the gas stream for low % or PPM O2 level analysis.

Advanced Instruments, Inc
7
Operating 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 1,800 ºF to ambient. The recommended operating temperature is below 35 ºC. However, the
analyzer may be operated at temperature up to 45 ºC on an intermittent basis but the user is expected to
accept a reduction in expected sensor life –as a rule of thumb, for every degree ºC increase in temperature (above 25 ºC),
the sensor life is reduced by approximately 2.5%. If the analyzer is to be in a cold environment (below 0oF, install the
analyzer ina heated enclosure to prevent the sensor from freezing).
Warning – Sample Stream entering unit must never exceed 50 0C
Heat: Situate and store the analyzer away from direct 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, knobs or other mechanical components. Before moving your
analyzer be sure to disconnect the wiring/power cord and any cables connected to the output terminals of the analyzer.
SamplePressureandFlow
All electrochemical oxygen sensors respond to partial pressure changes in oxygen. The sensors are equally capable of
analyzing the oxygen content of a flowing sample gas stream or monitoring the oxygen concentration in ambient air (such
as a confined space in a control room or an open area around a landfill or bio-pond). The following is applicable to
analyzers equipped with fuel cell type oxygen sensors.
Analyzers designed for in-situ ambient or area monitoring has no real sample inlet and vent. The sensor is exposed directly
to the sample gas and it is intended to operate at atmospheric pressure. The analyzer has a built-in pressure sensor and
the sensor output is automatically compensated for any atmospheric pressure changes.
Inlet Pressure: For the analyzers designed to measure oxygen in a flowing gas stream, the inlet sample pressure
must be regulated between 5-30 psig. Although the rating of the SS tubing and tube fittings/valves itself is considerably
higher (more than 100 psig), a sample pressure of 5-30 psig is recommended for ease of control of sample flow.
The analyzer equipped with a sample system has designated SAMPLE and VENT ports. Connect SAMPLE gas to
SAMPLE and the vent to the VENT ports only.
Caution: If the analyzer is equipped with an optional H2S scrubber, sample inlet pressure must not exceed 30
psig.
Outlet Pressure: In applications where sample pressure is positive, the sample must be vented to an exhaust pipe at
a pressure less than the inlet pressure so that the sample gas can flow through the sensor housing. Ideally, the sample
must be vented to atmospheric pressure.
Note: The sensor may be used at a slight positive pressure (e.g., when sample is vented to a common exhaust where the
pressure might be higher than 1 atmosphere). However, the pressure at the sensor must be maintained at all times
including during the span calibration. This may be accomplished by using a back-pressure regulator at vent line of the
analyzer. Caution: A sudden change in pressure at the sensor may result in the sensor electrolyte leakage.
Flow rates of 1-5 SCFH cause no appreciable change in the oxygen reading. However, flow rates above 5 SCFH may
generate a slight backpressure on the sensor resulting in erroneous oxygen readings.
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 integral metering valve positioned upstream of the
sensor is recommended for controlling the sample flow rate between 1-5 SCFH. If a separate flow control valve and a flow
indicator is used, position flow control valve upstream of the sensor and position a flow indicator downstream of the sensor.
If necessary, a pressure regulator upstream of the flow control valve should be used to regulate the inlet pressure between
5-30 psig.
Caution: If the analyzer is equipped with a H2S scrubber as part of an optional sample conditioning system,
inlet pressure must not exceed 30 psig.

Advanced Instruments, Inc
8
Application Pressure - Atmospheric or Slightly Negative: For % oxygen measurements, an
optional external sample pump may be used upstream of the sensor to push the sample across the sensor and out to
atmosphere. For PPM 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. However, if the sample pump can pull/push
more than 5 SCFH, a flow control must be used to control the sample flow. The flow control valve must be positioned in
such a way that it does not generate any vacuum on the sensor.
Caution: If the analyzer is equipped with a flow indicator with integral metering valve or a metering flow
control valve upstream of the sensor and the pump is installed downstream of sensor- open the metering
valve completely before turning the pump ON to avoid drawing a vacuum on the sensor and placing an u
burden on the pump.
ndue
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.
Moisture & Particulates: 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 other optional components. Moisture and/or particulates do not necessarily damage the sensor. However,
collection of moisture/particulate on the sensing surface can block or inhibit the diffusion of sample gas into the sensor
resulting in a reduction of sensor signal output – and the appearance of a sensor failure. Consult the factory for
recommendations concerning the proper selection and installation of optional components.
Moisture and/or particulates generally can be removed from the sensor by opening the sensor housing and either blowing
on the sensing surface or gently wiping or brushing the sensing surface with damp cloth. Caution: Minimize the exposure
of PPM sensors to air during this cleaning process. Air calibration followed by purging with zero or a gas with a low PPM
oxygen concentration is recommended after the cleaning process is completed.
Mounting: The analyzer is approved for indoor as well as outdoor use. However, avoid mounting in an area where
direct sun might heat up the analyzer beyond the recommended operating temperature range. If possible, install a small
hood over the analyzer for rain water drain and to prevent over-heating of analyzer.
Gas Connections: The Inlet and outlet vent gas lines require 1/8” or ¼” stainless steel compression type tube
fittings. The sample inlet tubing must be metallic, preferably SS. The sample vent line may be of SS or hard plastic tubing
with low gas permeability.
Power: Supply power to the analyzer only as rated by the specification or markings on the analyzer enclosure. The
GPR-1500 IS is powered by 12-28 VDC supply. The wiring that connects the analyzer to the power source should be
installed in accordance with recognized electrical standards. Ensure that the analyzer case is properly grounded and
meets the requirements for area classification where the analyzer is installed. Never yank wiring to remove it from a
terminal connection.
The maximum power the analyzer consumes is no more than 7 Watts.

Advanced Instruments, Inc
9
4.Features&Specifications

Advanced Instruments, Inc
10
*WARNING - Potential Explosion Hazard : The devices are not intended for use in atmosphere or with sample gas
streams containing more than 21% oxygen (ambient air) and are only intended for use with or in gases or gas mixtures
classified as Class I, Div 1 Groups C and D hazardous location gases or in non-hazardous locations when used in the
United States or Canada.
**NOTE 1: Optional Sampling system shown is not part of UL/cUL Classification.

Advanced Instruments, Inc
11
5.Operation
PrincipleofOperation
The GPR-1800 IS Oxygen Analyzer incorporates a variety of advanced galvanic fuel cell type oxygen sensors. These
sensors are very specific to oxygen and generate an electrical signal proportional to the amount of oxygen present in a gas
stream. The selection of A particular type of sensor depends on the composition of the sample gas stream. Consult the
factory for recommendation.
The analyzer is configured in two sections. The signal processing electronics and sensor are housed in a general purpose
NEMA 4X rated enclosure. The terminals for incoming power, signal output and intrinsic safety barriers are mounted on a
PCB housed in an explosion proof enclosure.
The two sets of electronics are interconnected using an explosion proof Y-fitting, explosion proof packing fiber and sealing
cement – see Appendix A. Once connected, the intrinsic safety barriers limit the amount of power that flows to and from
the signal processing electronics effectively preventing an explosive condition. The analyzer design conforms to the ATEX
directive for equipment as intrinsically safe and has been approved by an independent body:
The analyzer carries the following area classification
II 2 G
Ex d ib IIB T4 Gb
Tamb -20⁰C to +50⁰C
WARNING: POTENTIAL ELECTROSTATIC CHARGING HAZARD-SEE INSTRUCTION
For USA and Canada
UL 913, 7th Edition
CSA C22.2 No. 157-92
It must be installed in accordance with
EN 60079-14
For USA - NEC and Canada – CEC Standards
The GPR-1800 IS also meets the intrinsic safety standards required for use in Class I, Division 1, Groups C, D hazardous
areas.

Advanced Instruments, Inc
12
AdvancedGalvanicSensorTechnology
All galvanic type sensors function on the same principle and are specific to oxygen. They measure the partial pressure of
oxygen from low PPM to 100% levels in inert gases, gaseous hydrocarbons, helium, hydrogen and mixed gases
Oxygen, the fuel for this electrochemical transducer, diffusing into the sensor, reacts electrochemically 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 measuring 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 this extremely versatile oxygen sensing
technology. Sensors for low % analysis recover from air to low % levels in seconds, exhibit longer life and reliable quality.
The expected life of our new generation of percentage range sensors now range from 32 months to 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. Contact factory for more specific information about your application.
NOTE- Check the product label for safe operating conditions
The PPM sensors recover from an upset condition to low PPM level in a matter of few minutes. These sensors show
excellent stability over its useful life.
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 of the low range. Oxygen readings
may be recorded by an external device via the 4-20 mA or 1-5V signal output.
SampleSystem
See Section 4, Features and Specification, Note 1 for exclusions.
The standard GPR-1800-IS is supplied without a sample conditioning system thereby giving users the option of adding
their own or purchasing a factory designed sample conditioning system, see section 2 QC Certification for optional
equipment ordered. Whatever the choice, the sample must be properly conditioned before introducing it to the sensor to
ensure an accurate oxygen measurement.

Advanced Instruments, Inc
13
The GPR-1800 IS is generally supplied with a minimum of a sample flow control valve and a flow meter. Users interested
in adding their own sample conditioning system should consult the factory. Advanced Instruments Inc. offers a full range of
sample handling, conditioning and expertise to meet your application requirements. Contact us at 909-392-6900 or e-mail
us at [email protected].
Calibration&AccuracyOverview
Single Point Calibration: As previously described the
galvanic type oxygen sensor generates an electrical
current proportional to the oxygen concentration in the
sample gas. In the absence of oxygen the sensor
exhibits an absolute zero, e.g. the sensor does not
generate a current output in the absence of oxygen.
Given these linearity and absolute zero properties,
single point calibration is possible.
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 must be
the same.
Temperature: The rate at which 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 and a network of resisters offsets this effect with an accuracy of
+5% or better over a wide operating temperature range e.g., 5-45 oC can be obtained thus the signal output remains
virtually independent of ambient temperature. There is extremely low error in measurement if the calibration and sampling
are performed at similar temperatures (within +/- 5 ºC. Conversely, a temperature variation of 10 ºC may produce an error
of < 2% of full scale.
Accuracy: In light of the above parameters, the overall accuracy of an analyzer is affected by two types of errors: 1)
'percent of reading errors', illustrated by Graph A below, is contributed by the temperature compensation circuit (tolerance
in the thermistor value, variation in temperature coefficient of the thermistor, tolerances in resistors values and the
accuracy in the measuring devices, e.g., LCD display and 2) 'percent of full scale errors', illustrated by Graph B, such as1-
2% offset errors in readout and calibration devices. Other errors are 'spanned out' during calibration, especially when
analyzer is calibrated close to the top end of the measuring range.
Graph C illustrates these 'worse case' specifications that are typically used to develop an overall accuracy statement of <
1% of full scale at constant temperature or < 5% over the operating temperature range. The QC testing error is typically <
0.5% prior to shipment of analyzer from the factory.
Example 1: As illustrated by Graph A, any error during a span adjustment at lower end of the scale, e.g., 20.9% (air) on a
100% full scale range, would be multiplied by a factor of 4.78 (100/20.9) when making measurements close to 100% O2.
Conversely, an error during a span adjustment close to the top end of the range, e.g., at 100% is reduced proportionately
for measurements of oxygen concentrations near the bottom end of the range.
Graph B represents a constant error over the entire measuring range. This error is generally associated with the measuring
e.g., LCD and or calibrating devices, e.g., current simulator or current/voltage measuring devices.
Potential Explosion Hazard – See warning in Section 4 – Features and Specifications

Advanced Instruments, Inc
14
MountingtheTransmitter
The GPR-1800 IS analyzer consists of two interconnected enclosures (without the optional sample conditioning system
and panel) and measures 8”H x 15-3/4”W x 7”D. This configuration is designed to be mounted directly to any flat vertical
surface, wall or bulkhead plate by using eight (4)
of the appropriate screws.
To facilitate servicing the interior of the
transmitters, secure the back plate to a vertical
surface approximately 5 feet from the floor or a
level accessible to service personnel. This
requires the user to supply four (4) additional
proper size screws and anchors.
Caution: Do not remove or discard
the gaskets from either the Ex
enclosure or the fiberglass enclosure.
Failure to reinstall either of the
gaskets will void the NEMA 4, UL Type 3R rating
and the immunity to RFI/EMI.
Transmitter without a sample conditioning system
The transmitters design provides immunity from RFI/EMI by maintaining a good conductive contact between the two halves
of the enclosures via a conductive gasket (the smaller enclosure containing signal processing electronics) The surfaces
contacting the conductive gasket are unpainted. Do not paint these areas. Painting will negate the RFI/EMI protection.
Note: If equipped with the optional H2S sample conditioning system, the transmitter and sample system are mounted to a
back panel 15-3/4”H x 15-3/4”W with four
mounting holes. Mount the entire panel to any
vertical flat surface.
See Section 4 – Features and Specifications, for
exclusions
If the ambient temperature is expected to fall
below -18 degree C (0 degree F), install the
analyzer in a heated enclosure to prevent sensor
from freezing.
Transmitter with sample conditioning system

Advanced Instruments, Inc
15
GasConnections
The GPR-1800 IS with its standard flow through configuration is designed for positive pressure samples and requires
connections for incoming sample and outgoing vent lines. Zero and span inlet ports are offered as part of the optional
sample systems. The user is responsible for calibration gases and other required components, follow procedure below to
establish gas connections.
Procedure
Caution: Do not change the factory setting until instructed to do in this manual.
Before introducing sample gas to the analyzer
• Regulate the sample pressure as described in “Pressure and Flow” section above.
• Connect a 1/8” or ¼” vent line to the compression fitting to be used for venting the sample.
• Connect a 1/8” or ¼” sample line to the compression fitting to be used to bring SAMPLE gas to the analyzer.
• If equipped with optional SPAN and/or ZERO ports, connect the SPAN and the ZERO gas lines to the respective
SPAN and ZERO ports of the analyzer
• Set the SAMPLE, SPAN and the ZERO gas pressure between 5-30 psig..
• Select sample gas and allow it to flow through the transmitters and set the flow rate to1- 2 SCFH.
Note: If equipped with the optional H2S sample conditioning system: Regulate the pressure so that it does not exceed 30
psig.
Flow rates of 1-5 SCFH cause no appreciable change in the oxygen reading. However, flow rates above 5 SCFH may
generate a backpressure and cause erroneous oxygen readings due to fact that the smaller diameter of the integral
sample system tubing cannot vent the sample gas quickly at higher flow rates. If the analyzer is not equipped with an
integral flow control valve, a flow control metering valve with a flow indicator upstream of the sensor must be installed to
control the flow rate of the sample gas. A flow rate of 1-2 SCFH or 0.5-1 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 sudden vacuum on the sensor and
may lead to electrolyte leakage thus causing damage to the sensor (will void sensor warranty).

Advanced Instruments, Inc
16
ElectricalConnections
Incoming power/signal output connections are
made to terminal block mounted on a PCB located
in the explosion proof enclosure.
Do not supply voltage more than specified in this
manual and noted near the power input terminal of the
analyzer.
The PCB in the explosion proof enclosure contains a power
limiting intrinsic safety barrier that limit the total power
available at the PCB electronics mounted in the general
purpose enclosure.
With proper insulation of the incoming power (see Appendix
A), this configuration of the GPR-1800 IS conforms to the
ATEX directives for equipments for use in hazardous area. The
analyzer meets the following area classification:
Ex/Explosion proof enclosure for power/signal output
II 2 G
Ex d ib IIB T4 Gb
Tamb -20⁰C to +50⁰C
The GPR-1800-IS also meets the intrinsic safety standards required for use in Class I, Division 1, Group C, D hazardous
areas.
The A-1166 IS PCB in the Ex enclosure contains 2 fuses, one plug-in (brown color) rated at 100 mA and the rest mounted
on the PCB (after the DC voltage is regulated to lower safe value, these fuse meet barrier network standard EN 50020).
Avoid electrostatic discharge – Clean all surfaces with a damp cloth only.
Analyzer ground terminal must be connected to a ground

Advanced Instruments, Inc
17
HazardousAreaInstallation
The GPR-1800-IS may be installed in a hazardous area with proper insulation of the incoming power, see Appendix A. A
18-28 VDC power supply with a shielded power cable is recommended. The power cable to the Ex enclosure must be
supplied through a conduit approved for use in hazardous area. Secure the wires to the power input terminal block by
using the integral screws of the terminal block. Do not substitute terminal screws.
CAUTION: Check the QC for the proper power requirement. Incorrect power will severely damage the
analyzer
wire loop powered transmitter and requires 18-28 VDC. 4-20 mA or 1-5 VDC is transmitted on the
o not exceed the recommended power requirement..
e
18-28 VDC
0 mA Signal Out
roof
Enclosure Enclosure
ting wires between the explosion proof enclosure and the fiber glass enclosure, for
wn.
ments consist of a 18-24 VDC power supply. Check the QC and analyzer cover plate for proper power
losure.
ve terminals of the power supply are connected to the appropriate terminals of the
g of the cable to the ground screw inside the enclosure.
• Replace the cover.
eld to
fter connecting the shield, ensure that the male terminal is fully inserted and secured into the
female terminal block.
OutputConnections
The analyzer is a two
same power loop..
D
Power Sourc
Power IN/4-2
Explosion P Fiber Glass
NOTE: There are three interconnec
Clarity, only two wires are sho
Procedure
Power require
requirement.
• Unscrew the cone shaped cover from the lower enc
• Separate the shielding from the wires of the cable.
• Ensure the positive and negati
terminal block as marked.
• Connect the shieldin
Note: The male and female power terminals snap together, making it difficult to detach them when connecting the shi
the ground. However, a

Advanced Instruments, Inc
18
InstallingtheOxygenSensor
The GPR-1800 IS Oxygen Analyzer is equipped with a SS sensor housing. This housing offers ease of replacement of
sensor and at the same time prevents any leakage into the system. The two sections of the sensor are held together be a
metal clamp secured in place by easily accessed bolt. The integrity of the sensor housing has been tested at the factory
prior to shipment and is fully operational from the shipping container.
Caution: All analyzers must be calibrated once the installation has been completed and periodically thereafter
as described below. Following the initial installation and calibration, allow the transmitters to stabilize for 12-24
hours and re-calibrate the transmitter with a certified span gas.
Caution: DO NOT dissect 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 off in a manner similar to that of a common
battery in accordance with local regulations.
Avoid electrostatic discharge – Clean all surfaces with a damp cloth only.
Procedure
• Remove the two (2) clamps securing the right side corners and open
the door of the fiber glass enclosure.
• Loosen the bolt at the bottom of the sensor housing by using 5/16
ranch provided.
• Twist the upper section of the housing 90 degree and pull it up until it
clears the bottom section of the sensor housing.
• Remove the old sensor (if previously installed) from the sensor
housing
• Remove the oxygen sensor from the bag and remove the two red
shorting taps from the two ring gold color contact plate of the sensor.
• Insert the sensor into the upper section of the sensor housing with
gold contact plate facing towards two gold contact pins of the sensor
housing
• By holding the sensor and the upper section of the sensor housing in
your hand, allow 2-3 minutes for the analyzer to respond to the new
sensor. The analyzer should display oxygen around 21% with factory
default span setting (see below)
• You may perform a quick air calibration to ensure that the analyzer
accepts the air calibration confirming that the sensor out put is within the recommended limits.
• Place the sensor in the bottom section of the sensor housing with the two ring gold contact plate facing up. Place
the upper section of the sensor housing over the sensor. Slightly push it down and twist 90 degree.
• By using the 5/16 ranch, tighten the bolt securing the two section together.

Advanced Instruments, Inc
19
SpanGasPreparation
See Section 4 – Features and Specifications, for exclusions
Note: The GPR-1800 IS can be calibrated by using ambient air. However, it can also be calibrated by using a certified
span gas. Air calibration can be achieved right after installing the sensor in the housing. Subsequent calibration, where the
sensor has been exposed to a sample gas, air calibration can be achieved by either removing the sensor from the sensor
housing or by pushing the air through the sensor housing.
Caution: Do not contaminate the span gas cylinder when installing the pressure regulator on the span gas
cylinder. Further, bleed the air filled regulator and span gas tubing before connecting the span gas to the
analyzer and attempting the initial calibration.
RequiredComponents
• Certified span gas cylinder with an oxygen concentration, balance nitrogen, approximating 80% of the full scale of
the measuring range or one range above the intended measuring range.
• A pressure regulator to set the span gas pressure between 5 and 30 psig.
• A flow meter to set the flow between 1-5 SCFH (only if the transmitter is not equipped with integral flow meter),
• Suitable tube fittings and a 4-6 ft. length of 1/8” dia. metal tubing to connect the regulator to the flow meter inlet
• Suitable tube fittings and a 4-6 ft. length of 1/8” dia. metal tubing to connect from the flow meter vent to tube fitting
designated as SAMPLE IN or SPAN IN at the analyzer.
Procedure
• With the span gas cylinder valve closed, install the pressure regulator on the cylinder.
• Open the regulator’s exit valve and partially open the pressure regulator’s control knob.
• Open slightly the cylinder valve.
• Loosen the nut connecting the regulator to the cylinder and bleed the pressure regulator.
• Retighten the nut connecting the regulator to the cylinder
• Adjust the regulator exit valve and slowly bleed the pressure regulator.
• Open the cylinder valve completely.
• 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 damage the sensor