Analytical Industries Inc (AII) GPR-2500 GB Operating Manual

Advanced Instruments Inc.

GPR-2500 GB

% Oxygen Transmitter

Owner’s Manual

Revised May 17, 2017

2855 Metropolitan Place, Pomona, CA 91767 USA ♦ Tel: [phone], Fax: [phone], e-mail: [e-mail], www.aii1.com

Table of Contents

Introduction 1

Quality Control Certification 2

Safety 3

Features & Specifications 4

Operation 5

Maintenance 6

Spare Parts 7

Troubleshooting 8

Warranty 9

Material Safety Data Sheets 10

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1. Introduction

Your new oxygen transmitter incorporated an advanced electrochemical sensor specific to oxygen along with
s

tate-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 om your new oxygen transmitter,

read and follow the guidelines p

please rovided 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
transm and minimal cost of ownership. This transmitter was tested roughly by
the manufacturer prior to shipment for best performance. However, modern electronic devices do require
service me. The warranty included herein plus a staff of trained professional technicians to
quickly ansmitter 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
numbe ded and retains this Owner’s Manual as a permanent record of your purchase, for
future nd for warranty considerations.

Serial Number: _______________________

A
p

itter for superior performance tho

from time to ti
service your tr

r in the space provi

reference a

dvanced Instruments Inc. appreciates your business and pledges to make every effort to maintain the highest

ossible quality standards with respect to product design, manufacturing and service.

fr

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Quality Control & Calibration Certification

Customer: Date:

Order No.:

Model: GPR-2500 Oxygen Transmitter S/N:

Configuration

Accessories: Owner’s Manual

: A-1161-IS-2 Rev C4 PCB Assembly, Main Batch:

A-1182-2 Rev B PCB Assembly, Interconnection (18-28 VDC) Batch:

Ranges: 0-1%, 0-5%, 0-10%, 0-25%

Temperature compensation

A-2221 Flow Housing, 1/8" SS tubing, connections

Wall mount enclosure, painted aluminum 3"x4"x2"

Sensor: ( ) GPR-11-32-4 Oxygen Sensor

( ) XLT-11-24-4 Oxygen Sensor S/N:

B-3170 Sample / Calibration Module

Software

Ver:

Expected Observed

Value Value Pass

Test & Verify: Default zero

Default span in air @ 40 µA

Span calibration upper limit in air @ 55 uA

Span calibration lower limit in air @ 35 uA

Reading after air (20.9%) calibration

Baseline drift over 1 hour period (+5% FS) on 1% range

Noise level (+1% FS) on 1% range

Analog signal output 4-20 mA full scale

Overall inspection for physical defects

Options: NA

Other: NA

.00 + .05 low

range

19.0% to

23.0%

20.5% to

21.3%

20.5% to

21.3%

20.5% to

21.3%

+ 0.05%

Oxygen

+ 0.01%

Oxygen

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3. Sa

fety

General

This section summari
Tra di na recautions specific to individual transmitter are contained in the g sectio of

nsmitter. Ad

this o rate the transmitter safely and obtain maximum performance follow the basic guidelines

manual. To pe

outlined in this Owner’s Manual.

Caut : T symbol is used throughout

ion his the Owner’s Manual to CAUTION and alert the user to

recom d safety and/or operating guidelines.

Warning: Th
presence of electrostatic discharge.

Danger: This anual to identify sources of immediate
DANGER suc

Instructions: efore operating the transmitter read the in

Read B structions.
Retain Instructions: tructions found in the Own should be

retained for futu

eed Warnin w all warnings M

H gs: Follo on the transmitter, accessories (if any) and in this Owner’s anual.
Follow Instructions: erating instructions. Failure t y result in

personal injury or damage to the transmitter.

zes the essential precautions applicable to the GPR-2500 GB

mende

is symbol is used throughout the Owner’s Manual to

symbol is used throughout the Owner’s M

h as the presence of hazardous voltages.

The safety precautions and operating ins

re refere

nce.

Observe all precautions and op o do so ma

percent Oxygen

followintio l p ns

Warn

and alert the user of the

er’s Manual

Pressure and Flow

GPR-2500 GB PPM Oxygen Transmitter is designed for measuring controlled atmo ide a glove box.

s a n gas and using the Glove Box Housing Assembly photo s n 4
Specification) which is eq ctions and are intended to operate at positive
pressure or for calibra as, inlet pressure but be regulated to . The
sample/span gas mus .

uipped with 1/8” tube fitting conne
tion with external span g 5-30 psig
t be vented to atmospheric pressure

sphere ins

(refer to Calibration require flowing spa ectio

Oxygen sensor

DO NOT open the sen electrolyte that cou rmful if touched o
ingested, refer to the M er’s Manual ap . Avoid contact with
any liquid or crystal type powd sor or sensor housing, as either e a form of
electrolyte. Leaking se accordance with local regulatio

sor. The sensor contains a corrosive liquid ld be ha

aterial Safety Data Sheet contained in the Own

er in or around the sen

nsors should be disposed of in

pendix
could b
ns.

r

Mounting

The transmitter is approved for indoor use only. Mount the transmitter as recommended by the manufacturer.

Power supply

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
electric dar . N er yank wiring to remove it from a terminal connection. Power consump n is less
th

al stan

an 60 t 24 VDC.

mA a

ds ev

tio

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OTperating temperature

he maximum recommended operating temperature is 45ºC, (at temperatures above 25oC, the user is
expected to accept
intermittent basis, th

Heat

Situate and store the transmitter away from sources of heat.

Liquid and object entry

The tran
and obje

smitter should not be immersed in any liquid. Care should be taken so that liquids are not spilled on

cts do not fall on the transmitter

a dramatic reduction in expected sensor life – refer to analyzer specification). On

e transmitter may be operated up to 50

o

C

Mainte

Except f are no parts inside the transmitter for the operator to service.
Only trained personnel with authorization of their supervisor should conduct maintenance.

Troubl

Consult efore concluding that your
transmitter is faulty. Do not attempt to service the transmitter beyond those m
Manual.

personnel.

conducting surface (to discharge any electrostatic charge on the body)

nance

or replacing the oxygen sensor, there

eshooting

e guidelines in Section 8 for advice on the common operating errors bth

eans described in this Owner’s

Do not attempt to make repairs by yourself as this will void the warranty as per Section 10 and ma

CLEANING: The transmitter should be cleaned only as recommended by the manufacturer. Wipe off
dust and dirt from
solvents or chemicals. Do not touch the transmitter enclosure without first touching any solid

the outside of the unit with a soft damp cloth then dry immediately. Do not use

y

ce

rviresult in electrical shock, injury or damage. All other servicing should be referred to qualified se

Non-use period

If the transmitter is equipped with a range switch advance th
p

ower when the transmitter is left unused for a long period of time. Store transmitter away from source of heat.

e switch to the OFF position and disconnect the

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4 Features & Specifications

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5. Operation
Principle of Operation

The GPR-2500 GB 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.

Advanced Galvanic Sensor Technology

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 -20°C to 50°C.
Contact factory for more specific information about your application.

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.

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Sensitivity is typically
the 4-20 mA loop curr
transmitter and the ground of the loop

NOTE: A 4-20mA signal output is provided on the two-wire 18-24VDC loop power source such as a PLC and
represents a full scale range of measurement. When operated in conjunction witt manufacturer’s recommended
optional intrinsic safety barrier, the GPR-2500 GB meets the intrinsic safety standards required for use in Class
1, Division 1, Groups C, D hazardous are

The GPR-2500 GB is also available in a version, requiring optiona
certified to ATEX Directive 94/9/EC, Ex II 2 G Ex ia IIB T4 Gb Tamb -20⁰C to + 50⁰C

Sample System

The GPR-250
bracket for sa

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]

0 GB is supplied with a unique Glove Box Housing Assembly that also includes a mounting
mpling (see photo section 4 Specifications) and flow housing with valves for calibration.

Accuracy and Calibration

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 or
percentage 'per unit volume'.

Temperature: The rate at which oxygen molecules

e sensor is controlled by a Teflon membrane otherwise known as an 'oxygen diffusion limiting diffuse into th
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 +
over a wide operating temperature range e.g., 5-45
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 º
may produce an error of >2% of full scale.

Accuracy:

errors: 1) 'percent of reading errors', illustrated by Graph A below and 2) 'percent of full scale errors', illustrated
by Graph B, such as1-2% errors in readout and calibration devices. Other errors are 'spanned out' during
calibration, especially when analyzer is calibrated close to the top end

In light of the above parameters, the overall accuracy of an analyzer is affected by two types of

0.5% of full scale low range. Oxygen readings may be recorded by an external device via
ent or 1-5 VDC by using a 250 ohms resistor between the negative terminal of the

power source.

as.

l intrinsic safety barriers, that has been

o

C can be obtained thus the signal output remains virtuall

of the measuring range.

5% or better

y

C

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