Analytical Industries GPR-1600 MS User Manual

Advanced Instruments Inc.

GPR-1600 MS

ppm Oxygen Analyzer

Owner’s Manual

2855 Metropolitan Place, Pomona, California 91767 USA ♦ Tel: [phone], Fax: [phone], e-mail: [e-mail]

Table of Contents

Introduction 1
Quality Control Certification 2
Safety & Installation 3
Features & Specifications 4
Operation 5
Maintenance 6
Spare Parts 7
Troubleshooting 8
Warranty 9
Material Safety Data Sheets 10
Correlating reading - LCD display to 4-20mA output Appendix B

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1 Introduction

Your new oxygen analyzer is a precision piece of equipment designed to give you years of use in variety of industrial oxygen
applications.

This analyzer is designed to measure the oxygen concentration in inert gases, gaseous hydrocarbons, hydrogen, and a variety
of gas mixtures. 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.

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2 Quality Control Certification

Date:

Model: GPR-1600MS ppm Oxygen Analyzer S/N _____________________
Sensor: GPR-12-2000MS ppm Oxygen Sensor S/N _____________________

Accessories: Owner’s Manual

Configuration: Ranges: 0-1 ppm, 0-10 ppm, 0-100 ppm, 0-1000 ppm

( ) Stainless steel sensor housing, manual flow control and bypass valves, ¼” compression

Temperature controlled heater system 85°F specify: ( ) 110VAC ( ) 220VAC ( ) Delete
Power: 100/120/220/250 VAC (universal without temperature controlled heater systems)
Enclosure: ( ) Std. panel mount (“T”) 7.5x10.8x12”; ( ) “TO” option 7.75x 7.75x12”

Test System start-up diagnostics satisfactory
Auto/manual range
Alarm relays activate/deactivate with changes in O2 concentration
Alarm bypass
Analog outputs: 4-20mA signal output
Range ID: ( x ) 4-20mA or ( x ) 5x relay contacts reflects range changes
Recovery from air to < 10 ppm in < 15 minutes
Baseline drift on zero gas < ± 2% FS over 24 hour period
Noise level < ± 1.0% FS
Span adjustment within 10-50% FS
Peak to peak over/under shoot < 0.5% FS
Overall inspection for physical defects

Options Label analyzer “Oxygen Service” in accordance with P-1507 Rev-1; see certificate next page.
Notes

Customer: Order No.:

CABL-1008 Power Cord
TOOL-1001 5/16” Combination Wrench

A-1146-20 PCB Assembly Main / Display Software V. ______
( ) A-1174 PCB Assy Power Supply / Interconnect, 4-20mA Range ID
( ) A-1174 PCB Assy Power Supply / Interconnect, 5x Relay Contacts Range ID

type fittings for sample inlet and vent
( ) Delete bypass valve from above (T and TO options)
( ) Sample, span, zero inlet solenoid valves

( ) Bezel for 19” rack mmount 19x12x12” option
( ) GPR-1600MS-W option general purpose wall mount 12x12x8”
( ) GPR-1600MS-W306 option general purpose panel mount 18.2x16x10”

Pass

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Certificate of Cleaning

Oxygen Service

Standard: Manufacturing Procedure No. P-1057 Rev-1,

Compressed Gas Association,
Publication: G-4.1 Edition 4,
Title: Cleaning Equipment for Oxygen Service,
Published 1/1/1996 and related publications

Mfg. Item No.: GPR-1600MS Series
Description: ppm Oxygen Analyzer

Serial No.:
Customer:
Purchase Order:

Quantity: 1 of
Warranty Date: 12 months from ______________

The undersigned warrants on behalf of Manufacturer that the product identified above
conforms to the manufacturing, testing and packaging criteria set forth by the ‘Standard’
specified above.

___________________________
___________________________
___________________________

Date:

______________
Place: Pomona, CA
By print name:
Signature:
Title:

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3 Safety Guidelines

Safety

This section summarizes the basic precautions applicable to all analyzers. Additional precautions specific to individual analyzer
are contained in the following sections of this manual. To operate the analyzer safely and obtain maximum performance follow
the basic guidelines outlined in this Owner’s Manual.

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 Instructions: Follow all warnings on the analyzer, accessories (if any) and in this Owner’s Manual.

Observe all precautions and operating instructions. Failure to do so may result in personal injury or damage to the analyzer.

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.

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.

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 this Owner’s 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.

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 detailed by 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: Disconnect the power when the analyzer is left unused for a long period of time.

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Installation

Gas Sample Stream: Ensure the gas stream composition of the application is consistent with the specifications and review the
application conditions before initiating the installation. Consult the factory to ensure the sample is suitable for analysis.

Contaminant Gases: A gas scrubber and flow indicator with integral metering valve are required upstream of the of the
analyzer to remove interfering gases such as oxides of sulfur and nitrogen or hydrogen sulfide that can produce false readings,
reduce the expected life of the sensor and void the sensor warranty if not identified at time of order placement. 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.

Expected Sensor Life: With reference to the publish specification located as the last page of this manual, the expected life of
all oxygen sensors is predicated on oxygen concentration (< 1000 ppm or air), temperature (77°F/25°C) and pressure (1
atmosphere) in “normal” applications. As a rule of thumb sensor life is inversely proportional to changes in the parameters.
Deviations are outside the specifications and will affect the life of the sensor, with respect to Pico-Ion sensors avoid exposure to
oxygen levels above 1000 ppm. Failure to do will result in damage to the sensor.

Accuracy & Calibration: Refer to section 5 Operation. Analyzers equipped with Pico-Ion oxygen sensors have a maximum
range of 0-1000 ppm reflecting its high signal output capability, DO NOT CALIBRATE THE GPR-1600MS WITH AMBIENT AIR.

Materials: Assemble the necessary zero, purge 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 ppm and percentage range (above or below ambient air) analysis; hardware for mounting.

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 1,800ºF to ambient. The
maximum operating temperature is 45º C on an intermittent basis unless the user is willing to accept a reduction in expected
sensor life – refer to analyzer specification - where expected sensor life is specified at an oxygen concentration less than 1000
ppm oxygen for ppm analyzers and air (20.9% oxygen) for percent analyzers, but in all instances at 25°C and 1 atmosphere of
pressure. Expected sensor varies inversely with changes in these parameters.

Pressure & Flow

All electrochemical oxygen sensors respond to partial pressure changes in oxygen. The sensors are equally capable of analyzing
the oxygen content of a flowing sample gas stream or monitoring the oxygen concentration in ambient air (such as a confined
space such a control room or open area such as a landfill or bio-pond). The following is applicable to analyzers equipped with
Pico-Ion UHP and MS oxygen sensors, also refer to the analyzer’s specifications.

Sample systems and flowing gas samples are generally required for applications involving oxygen measurements below 1% and
at a pressure other than ambient air. In these situations, the use of stainless steel tubing and fittings is critical to maintaining
the integrity of the gas stream to be sampled and 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 analyzer. The internal sample system includes 1/8” compression inlet and vent
fittings, a stainless steel sensor housing with an o-ring seal to prevent the leakage of air and stainless steel tubing.

A flow valve upstream (flow indicator positioned downstream) of the sensor is recommended as a means of controlling the flow
rate of the sample gas, minimizing potential air leaks and providing optimum performance.

Caution: The superior performance characteristics of the Pico-Ion Series oxygen sensor include:

¾ LDL (lower detectable limit) b
¾ Excellent stability,
¾ Fast recovery from high oxygen upset conditions,
¾ 24 month operating life,
¾ No maintenance

Flow Rate: For optimum performance, a flow rate of 1 SCFH at 30 psig is recommended.

elow 10 ppb,

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Inlet Pressure: Analyzers designed for flowing samples under positive pressure or pump vacuum (for samples at atmospheric
or slightly negative atmospheres) that does not exceed 4” water column are equipped with 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 20-50 psig although the rating of the fitting itself is considerably higher.

Outlet Pressure: In positive pressure applications the vent pressure must be less than the inlet, preferably atmospheric.
Application Pressure - Positive: 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 20-50 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 (vacuum should no exceed 4”
water column) 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. 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.

Recommendations to avoid erroneous oxygen readings and damaging 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 (thus voiding
the sensor warranty).

¾ Assure there are no restrictions in the sample or vent lines
¾ Avoid drawing a vacuum that exceeds 4” of water column pressure – unless done gradually
¾ Avoid excessive flow rates above 3 SCFH which generate backpressure on the sensor.
¾ Avoid sudden releases of backpressure that can severely damage the sensor.
¾ Avoid the collection of liquids or particulates on the sensor, they block the diffusion of oxygen into the sensor
¾ If the analyzer 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.

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 optional
components. Moisture and/or particulates do not necessarily damage the sensor, however, collection 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 when in fact the problem is easily remedied by blowing on the front of the sensor. Consult the factory for
recommendations concerning the proper selection and installation of 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 following the cleaning process. Moisture and/or particulates generally can be removed from the
sample system by flowing the purge gas through the analyzer at a flow rate of 4.5-5 SCFH for an hour.

Mounting: The analyzer is approved for indoor use, outdoor use requires optional enclosures, consult factory. Mount as
recommended by the manufacturer.

Gas Connections: Inlet and outlet vent gas lines for ppm analysis require 1/8” or ¼” stainless steel compression fittings; hard
plastic tubing with a low permeability factor can be used percentage range measurements.

Power: Supply power to the analyzer only as rated by the specification or markings on the analyzer enclosure. The wiring that
connects the analyzer to the power source should be installed in accordance with recognized electrical standards. Ensure that is
properly grounded and meets the requirements for area classification. Never yank wiring to remove it from a terminal
connection. AC powered analog analyzers consume 5 watts, digital analyzers 50 watts without optional heaters. Optional 110V
and 220V heaters AC powered heaters consume an additional 100-150 watts; DC powered digital analyzers consume 30 watts,
40 watts with the optional DC powered heater.

- wipe away.

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4 Features & Specifications

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5 Operation

Principle of Operation

The GPR-1600MS ppm Oxygen Analyzers incorporates a proprietary Pico-Ion oxygen sensor. It is configured for panel mounting
and requires a 7.5x10.8” (T configuration) cutout with 4 holes for the analyzer’s front panel. Optional configurations include a
panel mount (TO configuration) 7.75x7.75” with cutout; 19” bezel for rack mounting either the T or TO; 12x12x8” wall mount
enclosure; 18.2x16x10” panel mount configuration using the wall mount enclosure. Contact the factory for additional
information on options. All configurations are tested and calibrated by the manufacturer prior to shipment. The GPR-1600MS
analyzers and sensors are CE certified and manufactured under a Quality Assurance System certified by an independent agency
to ISO 9001:2000 standards. However, the main feature remains the:

Breakthrough Sensor Technology:

A breakthrough sensor technology measures the partial pressure of oxygen from less than 10 ppb to 1000 ppm level in inert
gases, gaseous hydrocarbons, helium, hydrogen and mixed gas streams. The “Pico-Ion” sensor design and chemistry have been
combined to produce a significant advancement in oxygen sensor technology.

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Oxygen, the fuel for this electrochemical transducer, 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 four ranges and
remains virtually constant over its useful life. The sensor requires no maintenance or electrolyte addition and is easily and safely
replaced at the end of 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 low range.

Additional features of the micro-processor based electronics include manual or auto ranging, auto-zero and auto-cal, isolated 4­20mA signal for signal output and range ID, separate relay contacts rated 30VDC max @ 1A are provided for the alarm feature
and an optional range ID feature (auto-zero/auto-cal with relay contacts for Range ID is special order, so . Whenever the
analyzer is calibrated, a unique algorithm predicts and displays a message indicating a ‘weak sensor’ suggesting the sensor be
replaced in the near future.

Sample System

The sample must be properly presented to the sensor to ensure an accurate measurement. In standard form the GPR-1600MS
is designed with a sample system that complements the performance capabilities of the Pico-Ion oxygen sensor and enables the
user to isolate the sensor from exposure to high oxygen concentration which results is a substantial increase is user
productivity. This bypass feature has two important features: one, the sensor can be isolated from exposure to h igh oxygen
levels when changing sample lines, during transport and during standby intervals making it ideal for mobile cart applications.
Two, it enables the user to purge newly connected gas lines of the oxygen trapped inside. The result is an analyzer that comes
on-line at ppb levels in a matter of minutes and provides users with a significant increase in productivity.

For ppb and ppm trace oxygen measurements, the sensor is exposed to sample gas that must flow or be drawn through the
analyzer’s internal sample system. This unique sample system, when operated accordingly to the instructions in this Owner’s
Manual, can significantly increase user productivity by minimizing the sensor’s exposure to ambient air or high oxygen
concentrations which contribute to the significant amount of downtime associated with competitive analyzers.

The advantages of the bypass sample system include:

¾ Supplying the analyzer with the sensor it was qualified with.
¾ Isolating the sensor during transport, calibration and maintenance intervals when changing gas line connections.
¾ Isolating the sensor from exposure to high oxygen levels during upset conditions which extends sensor life.
¾ Purging the air (or high oxygen levels above 1,000 ppm) trapped in the gas lines following a process upset.

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 [e-mail]

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Calibration & Accuracy Overview

Single Point Calibration: As previously described
the galvanic 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(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 +
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:

producing 'percent of reading errors', illustrated by Graph A below, such as +
of range resistors and the 'play' in the potentiometer used to make span adjustments and 2) those producing 'percent of full
scale errors', illustrated by Graph B, such as +
technology and the fact that other errors are 'spanned out' during calibration.
Graph C illustrates these 'worse case' specifications that are typically used to develop an analyzer's overall accuracy statement
of < 1% of full scale at constant temperature or < 5% over the operating temperature range. QC testing is typically < 0.5%
prior to shipment.

Example 1: 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.

In light of the above parameters, the overall accuracy of an analyzer is affected by two types of errors: 1) those

1-2% linearity errors in readout devices, which are really minimal due to today's

5% or better and generates an output function that is

5% temperature compensation circuit, tolerances

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Zero Calibration

In theory
oxygen free sample gas. In reality

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

The Zero Offset capability of the analyzer is limited to 50% of lowest most sensitive range available with the analyzer.
As part of our Quality Control Certification process, the zero capability of every ppm analyzer is qualified prior to shipment.

However, because the factory sample system conditions differ from that of the user, no ZERO OFFSET adjustment is made to
analyzer by the factory

Recommendations:

¾ ZERO CALIBRATION is recommended only

¾ Determining the true ZERO CALIBRATION adjustment requires approximately 24 hours to assure the galvanic fuel cell

¾ Always calibrate at the same temperature and pressure of the sample gas stream.
¾ Caution: Prematurely initiating the ZERO CALIBRATION function can result in negative readings near zero.
¾ ZERO CALIBRATION should precede SPAN CALIBRATION.
¾ If a ZERO CALIBRATION adjustment is made during initial installation, it is normally not required again until the sample

¾ If a ZERO CALIBRATION adjustment has NOT been made as described above, perform the DEFAULT ZERO and DEFAULT

¾ ZERO CALIBRATION is not practical and not recommended for portable analyzers or measurements on higher ranges.

Span Calibration

Span Calibration involves adjusting the transmitter electronics to the sensor’s signal output at a given oxygen standard.
Maximum drift from calibration temperature is approximately 0.11% of reading per °C. The frequency of calibration varies with
the application conditions, the degree of accuracy required by the application and the quality requirements of the user.
However, the interval between span calibrations should not exceed three (3) months.

Note: Regardless of the oxygen concentration of the standard used, the span calibration process takes approximately 10
minutes, however, the time required to bring a ppm analyzer back on-line can vary depending on a combination of factors and
assumes exposure to a zero/purge/sample gas** with an oxygen content below the stated thresholds immediately after span
calibration:

, the galvanic fuel cell type oxygen has an absolute zero meaning it produces no signal output when exposed to an

, expect the analyzer to generate an oxygen reading when sampling a zero gas due to:

for online analyzers performing continuous analysis below 5% of the lowest
most sensitive range available with a ppm analyzer, e.g. analysis below 0.05 ppm on the 0-1 ppm range, 0.5 ppm on the
10 ppm range, or below 0.1% (1000 ppm) with a percent analyzer.

sensor has consumed the oxygen that has dissolved into the electrolyte inside the sensor while exposed to air or
percentage levels of oxygen. After allowing the analyzer to stabilize with flowing zero gas (evidenced by a stable reading or
horizontal trend on an external recording device) perform the DEFAULT ZERO function before the ZERO CALIBRATION
function. For optimum accuracy, utilize as much of the actual sample system as possible.

system connections are modified or a new oxygen sensor is installed. Therefore the DEFAULT ZERO function is
recommended only when performing a ZERO CALIBRATION and during troubleshooting and should not be repeated before
routine subsequent SPAN CALIBRATION

SPAN functions when troubleshooting an analyzer and before SPAN CALIBRATION.

However, satisfying these users that the zero offset is acceptable for their application without the 24 hour wait can be
accomplished by introducing a zero gas (or sample gas with a low ppm oxygen concentration) to the analyzer. Unless the
zero gas is contaminated or there is a significant leak in the sample connections, the analyzer should read less than 100
ppm oxygen within 10 minutes after being placed on zero gas thereby indicating it is operating normally.

.

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* Refer to analyzer specifications for comparable data on the Pico-Ion UHP and MS oxygen sensors.
Recommendations General:

¾ The interval between SPAN CALIBRATION should not exceed three (3) months.
¾ Always calibrate at the same temperature and pressure of the sample gas stream.
¾ If a ZERO CALIBRATION adjustment is made during initial installation, it is normally not required again until the sample

system connections are modified or a new oxygen sensor is installed. Therefore the DEFAULT ZERO function is
recommended only when performing a ZERO CALIBRATION and during troubleshooting and should not be repeated before
routine subsequent SPAN CALIBRATION.

¾ If a ZERO CALIBRATION adjustment has NOT been made as described above, perform the DEFAULT ZERO and DEFAULT

SPAN functions when troubleshooting an analyzer and before SPAN CALIBRATION.

¾ Caution: Prematurely initiating the SPAN CALIBRATION function before the analyzer reading has stabilized can result in

erroneous readings. This is especially true when installing a new sensor that must adjust to the difference in oxygen
concentrations. It should take about 2 minutes for the sensor to equilibrate in ambient air from storage packaging.

¾ For 'optimum SPAN CALIBRATION accuracy' use a span gas approximating 80% of the full scale range higher range than

the range of interest (normal use) to achieve the effect of “narrowing the error” by moving downscale as illustrated by
Graph A in the Accuracy & Calibration section.

¾ SPAN CALIBRATION with a span gas approximating 5-10% of the full scale range near the expected oxygen concentration

of the sample gas is acceptable but less accurate than ‘optimum SPAN CALIBRATION accuracy’ method recommended – the
method usually depends on the gas available.

¾ SPAN CALIBRATION at the same 5-10% of the full scale range for measurements at the higher end of the range (example:

calibrating an Oxygen Purity Analyzer in air at 20.9% oxygen with the intention of measuring oxygen levels of 50-100%)
results in the effect of “expanding the error” by moving upscale as illustrated by Graph A and Example 1 in the Accuracy &
Calibration section above and is not recommended. Of course the user can always elect at his discretion to accept an
accuracy error of +

Recommendations Air Calibration:

¾ Do not calibrate an analyzer employing the Pico-Ion UHP or MS sensor, or, an oxygen purity sensor with air.

2-3% of full scale range if no other span gas is available.

Mounting the Analyzer

The standard GPR-1600MS is designed to be panel mounted and requires a cutout that accommodates the enclosure and 4
mounting bolts. The design also lends itself to 19” rack mounting with an optional bezel or wall mount enclosures as illustrated
below.

Procedure:

1. The GPR-1600MS is designed for panel mounting directly to any flat vertical surface, wall or bulkhead plate with the
appropriate cut out and four ¼” diameter holes for insertion of the mounting studs located on the back side of the front
panel.

2. When mounting the analyzer position it approximately 5 feet off the floor for viewing purposes and allow sufficient room for
access to the terminal connections at the rear of the enclosure.

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3. Note: The proximity of the analyzer to the sample point and use of optional sample conditioning components have an
impact on sample lag time.

Mounting GPR-1600MS:

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Mounting GPR-1600MS-W Option:

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