Ametek IPS-4-UV User manual

AMETEK Western Research

IPS-4 Analyzer

Infrared

Zone 1/Division 1

User Manual

PN 700076902, Rev A

Process Instruments

455 Corporate Blvd.

Newark, DE 19702

Ofces



believed adequate for the intended use of this instrument. If the instrument or procedures are used for purposes over and above the capabilities speci-



or liability. This publication is not a license to operate under, or a recommendation to infringe upon, any process patents.

SALES AND MANUFACTURING:

USA - Delaware

455 Corporate Blvd., Newark DE 19702 • Tel: 302-456-4400, Fax: 302-456-4444

USA - Oklahoma

2001 N. Indianwood Ave., Broken Arrow OK 74012 • Tel: 918-250-7200, Fax: 918-459-0165

USA - Pennsylvania

150 Freeport Road, Pittsburgh PA 15238 • Tel: 412-828-9040, Fax: 412-826-0399

CANADA - Alberta

2876 Sunridge Way N.E., Calgary, AB T1Y 7H9 • Tel: +1-403-235-8400, Fax: +1-403-248-3550

WORLDWIDE SALES AND SERVICE LOCATIONS:

USA - TexasTel: 281 463 2820, Fax: 281 463 2701

CHINA

Beijing / Tel: 86 10 8526 2111, Fax: 86 10 8526 2141

Chengdu / Tel: 86 28 8675 8111, Fax: 86 28 8675 8141

Shanghai / Tel: 86 21 6426 8111, Fax: 86 21 6426 7818

FRANCE

Tel: 33 1 30 68 89 20, Fax: 33 1 30 68 89 29

GERMANY

Tel: 49 21 59 91 36 0, Fax: 49 21 59 91 3639

MIDDLE EAST - Dubai

Tel: 971 4 881 2052, Fax: 971 4 881 2053

SINGAPORE

Tel: 65 6484 2388, Fax: 65 6481 6588

www.ametekpi.com

ii | IPS-4 Analyzer, Infrared Z1/Div1

Table of Contents

Offices .....................................................................................................................ii

Safety Notes ........................................................................................................viii

Electrical Safety ...................................................................................................viii

Grounding ...........................................................................................................viii

Personnel and Equipment Safety Information ................................................ix

Warnings ...................................................................................................ix

Cautions .....................................................................................................x

Warning Labels ..................................................................................................... xi

Environmental Information (WEEE) ................................................................ xi

Electromagnetic Compatibility (EMC) .............................................................xii

Special Warnings and Information ..................................................................xiii

Warranty and Claims .........................................................................................xiv

EC Declaration of Conformity ..........................................................................xv

CHAPTER 1 OVERVIEW

Principles of Operation .....................................................................................1-1

Basic Analytical Theory ..............................................................................1-1

The Implementation ...................................................................................1-2

Optical System and Measurement ..........................................................1-2

Sample System.........................................................................................1-3

Electronics ...............................................................................................1-4

Classified, Hazardous Area Protection Components and Functions ........1-5

Analyzer Electronics and Sample System Features ......................................1-7

CHAPTER 2 SPECIFICATIONS

Methodology .......................................................................................................2-1

Wavelength Ranges .....................................................................................2-1

Analyzer Range .......................................................................................2-1

Photometric Range ..................................................................................2-1

Analyzer Specifications .....................................................................................2-2

Analytes .........................................................................................................2-2

Response Time .............................................................................................2-2

Measurement Accuracy ..............................................................................2-2

Repeatability .................................................................................................2-2

Linearity ........................................................................................................2-2

Stability ..........................................................................................................2-2

Temperature Drift ........................................................................................2-2

24-Hour Zero Drift ......................................................................................2-2

Inputs .............................................................................................................2-3

Outputs .........................................................................................................2-3

Sample System Limits .................................................................................2-3

Sample Pressure ......................................................................................2-3

Oven/Sample System Enclosure Temperature .........................................2-3

Contents | iii

Sample Transport .........................................................................................2-4

Instrument Air Requirements ....................................................................2-4

Zero Fluid .....................................................................................................2-4

Sample Fluid Flow Rate ..............................................................................2-4

Electrical Requirements ..............................................................................2-5

Power Consumption ................................................................................2-5

Supply Voltage .........................................................................................2-5

Measuring Cell Construction ....................................................................2-5

Pressure Input Signals ................................................................................2-5

Xenon Flash Lamp .......................................................................................2-5

Environmental .............................................................................................2-6

Ambient Temperature ..............................................................................2-6

Humidity .................................................................................................2-6

Pollution Degree ......................................................................................2-6

Maximum Altitude..................................................................................2-6

Installation Category ...............................................................................2-6

Enclosure Material ..................................................................................2-6

Ingress Protection ....................................................................................2-6

On-Board Temperature Sensor ..................................................................2-6

Physical Dimensions ...................................................................................2-7

Approvals and Certifications .....................................................................2-7

CHAPTER 3 INSTALLATION & START-UP

Safety Considerations ........................................................................................3-2

Pre-Installation Requirements..........................................................................3-3

Storage Prior to Installation .......................................................................3-3

Uncrating and Inspecting the Analyzer ...................................................3-3

General Installation Information ..............................................................3-4

Tools, Equipment, and Supplies Required for Installation ...................3-4

Installing the Mechanical Components ..........................................................3-6

Mounting the Analyzer ..............................................................................3-6

Location and Environment ......................................................................3-6

Installing the Optical Bench Assembly ..................................................3-11

Installing the Sample System...................................................................3-13

Installing the Sample Probe/Sample Tap ...............................................3-13

Installing and Connecting the Sample and Vent Lines .........................3-14

Installing and Connecting the Instrument Air/Zero Fluid Line ...........3-15

Installing and Connecting the Purge Fluid Line ..................................3-17

Installing the Calibration (Span) Fluid Line (Optional) .......................3-18

Connecting I/O Signals, Alarm Relay Contacts, and AC Power ...............3-20

Electrical Connections ...............................................................................3-20

Permanent Ethernet Cable Connections (Optional) ............................3-23

Start-Up and Verification ................................................................................3-23

Powering Up the Analyzer .......................................................................3-23

Start-Up Diagnostic Checklist .................................................................3-30

Sample System Leak Check .....................................................................3-32

iv | IPS-4 Analyzer, Infrared Z1/Div1

Manually Zeroing the Analyzer Sample System ..................................3-34

Adjusting the Zero/Span Fluid Flow Rate .............................................3-35

Adjusting the Sample Flow Rate .............................................................3-35

Setting Sample Response Time ..............................................................3-36

Normal Operation ............................................................................................3-37

Recording Initial Readings .......................................................................3-37

Recording Initial Sample Response Time ..............................................3-37

Analyzer Configuration ..................................................................................3-38

CHAPTER 4 CONTROLLER / USER INTERFACE

Introduction to the User Interface Panel ........................................................4-2

User Interface Panel Components ............................................................4-2

Special Software Characters .......................................................................4-4

Working From the User Interface Panel – Conditions and Messages . 4-5

Summary of Analyzer Operation .............................................................4-6

Working in the Main Menus ............................................................................4-7

HOME Menu Screen ...................................................................................4-7

System Status Messages (HOME Screen) ..............................................4-9

Alarm and Warning Notification (HOME Screen) ..............................4-10

ALARMS and WARNINGS Menu Screen ..............................................4-11

Viewing Current Alarms and Warnings ...............................................4-11

Viewing Logged Alarms and Warnings ................................................4-12

STATUS Menu Screen ...............................................................................4-13

SETUP Menu Screen .................................................................................4-15

Calibration Control Screen ....................................................................4-16

Calibration Settings Screen ............................................................4-16

Flush Times .....................................................................................4-18

Calibration Fluid Concentration ...........................................................4-19

Calibration Screen .................................................................................4-20

Manually Starting a Zero Calibration ............................................4-21

Manually Starting a Span Calibration ...........................................4-21

Relay Setup Screens ..............................................................................4-23

Current Output Setup Screens .............................................................4-25

Setpoints ................................................................................................4-27

Diagnostics Screen ................................................................................4-28

System Settings Screen ........................................................................4-30

Login/Set Passwords Screen ..................................................................4-30

Changing the Password ...................................................................4-31

Locking the Password ......................................................................4-32

Removing the Password ..................................................................4-32

Backup/Restore Settings Screen ............................................................4-32

Backing Up Analyzer Configuration Settings ................................4-33

Restoring Analyzer Configuration Settings ...................................4-33

Ethernet Network Screen ......................................................................4-35

System Screen ........................................................................................4-37

Customization Screen ............................................................................4-38

Modbus Screen ......................................................................................4-39

Contents | v

CHAPTER 5 MAINTENANCE & TROUBLESHOOTING

Safety Considerations ........................................................................................5-1

Maintenance ........................................................................................................5-2

Preventive Maintenance .............................................................................5-2

Analyzer Preventive Maintenance Schedule ...........................................5-3

Before Performing Maintenance ...............................................................5-5

Locating a Plug in the Sample System ....................................................5-5

Detecting a Plug in the Sample System ..................................................5-5

Preventing a Plug in the Sample System (Gas Applications) .................5-6

Changing Out Replaceable Parts ..............................................................5-8

Tools, Equipment, and Supplies Required for Maintenance ...................5-9

Measuring Cell Preventive Maintenance ..............................................5-11

Xenon Flash Lamp Assembly Replacement ...........................................5-19

Replacing the Xenon Flash Lamp Assembly ...................................5-20

Replacing the MCU Battery ...........................................................5-23

Troubleshooting and Diagnostics ..................................................................5-26

Alarm Notification – Viewing Alarms on the User Interface Panel ...5-26

Viewing Current Alarm Messages ........................................................5-27

Viewing Historical Alarm Messages .....................................................5-27

Alarm Conditions and Corrective Action ..............................................5-28

Analyzer Reset ...........................................................................................5-31

CHAPTER 6 SERVICE & PARTS

Technical Support ...............................................................................................6-1

Returning Equipment ........................................................................................6-2

AMETEK Service & Aftermarket Sales Support ............................................6-3

Recommended Spare Parts ...............................................................................6-4

Measuring Cell Assembly Spare Parts ......................................................6-4

Optical Bench Assembly Spare Parts ........................................................6-4

Spare Analyzer Fuses ..................................................................................6-5

Spare Battery, MCU Board ........................................................................6-5

CHAPTER 7 MODBUS COMMUNICATION INTERFACE

Hardware: .....................................................................................................7-1

Configuration: ..............................................................................................7-2

Analyzer Modbus Interface Parameters .........................................................7-3

Modbus Address ..........................................................................................7-3

Modbus Functions .......................................................................................7-3

Holding Registers ...............................................................................................7-4

APPENDIX DRAWINGS

Analyzer Light Path Schematic .......................................................................A-2

Analyzer Mounting Details, ...........................................................................A-3

Analyzer Overall Component Layout ...........................................................A-4

vi | IPS-4 Analyzer, Infrared Z1/Div1

Micro Controller Board (700029902) ...............................................................A-5

Preamp Assembly (700043901) ........................................................................A-6

Display Interface Board (100-1978) .................................................................A-7

Customer Connection Board (100-1971) ........................................................A-8

Relay Board (100-2050) .....................................................................................A-9

Analog Board (100-2047) ................................................................................A-10

MCU Board (100-2045S) .................................................................................A-11

Interface Board (700030901) ........................................................................... A-12

Electronics Enclosure Wiring Diagram, Sheet 1 of 3 .................................A-13

Electronics Enclosure Wiring Diagram, Sheet 2 of 3 ................................A-14

Electronics Enclosure Wiring Diagram, Sheet 3 of 3 ................................A-15

Disconnect Enclosure Wiring Diagram .......................................................A-16

SUPPLEMENTAL INFORMATION

Essential Health and Safety Information

EXPO MiniPurge System manual

Contents | vii

Safety Notes

WARNINGS, CAUTIONS, and NOTES contained in this manual emphasize critical instructions

as follows:

An operating procedure which, if not strictly observed, may result in personal injury or envi-

ronmental contamination.

An operating procedure which, if not strictly observed, may result in damage to the equipment.

Important information that should not be overlooked.

Electrical Safety

High voltages are present in the analyzer housings. Always shut down power source(s) before

performing maintenance or troubleshooting. Only a qualified electrician should make electrical

connections and ground checks.

Any use of the equipment in a manner not specified by the manufacturer may impair the safety

protection originally provided by the equipment.

Grounding

Instrument grounding is mandatory. Performance specifications and safety protection are void if

instrument is operated from an improperly grounded power source.

Verify ground continuity of all equipment before applying power.

!

CAUTION



NOTE

!

CAUTION

!

WARNING

viii | IPS-4 Analyzer, Infrared Z1/Div1

!

WARNING

Personnel and Equipment Safety Information

This section describes important safety information to avoid personal injury and damage to the

equipment while installing, operating, maintaining, or servicing the equipment. All safety regu-

lations, standards, and procedures at the analyzer location must be followed.

All personnel involved with the installation, start-up, operation, maintenance, service, or trou-

bleshooting of the IPS-4 Analyzer must review and follow these Warnings and Cautions.

Warnings

Review and follow these Warnings to avoid personal injury or environmental contamination.

Always disconnect main AC power and/or external power sources to the analyzer before open-

ing any doors on the analyzer to check or perform maintenance on any components within the

enclosures.

If it is necessary to open the analyzer doors while the circuits are live, first monitor the area for

flammable gases and proceed only when the area is safe.

All electrical connections, adjustments, or servicing of the analyzer should be performed only

by properly trained and qualified personnel.

All electrical connections, materials, and methods (plus all safety policies and procedures) must

be made in compliance with local wiring regulations and electrical code for the hazardous area,

and be approved by the Owner Company.

Follow appropriate regulatory and/or company procedures to lock out the analyzer while work-

ing on the analyzer electronics.

Before working on the analyzer, test the area for flammable gases. If a flammable gas atmo-

sphere is present, do not open any doors without first disconnecting power and/or alternate

power sources to the analyzer.

Before working on the sample system, confirm that the system has been purged with Zero fluid

and is isolated (blocked in) from the process.

If the Oven/Sample System Enclosure is heated, the components within it will be hot; take

precautions to avoid burning yourself.

!

WARNING

!

WARNING

!

WARNING

!

WARNING

!

WARNING

Contents | ix

Cautions

Review and follow these Cautions to avoid damaging the equipment.

The electronic circuit boards and other static-sensitive components should be stored and trans-

ported in static-shielding carriers or packages.

For electrical-shock protection, the analyzer must be operated from a grounded power source

that has a securely connected protective-ground contact.

If it becomes necessary to handle any of the electronic circuit boards, do not subject the boards

to static discharge. The ideal solution is a static-safe work area. Since such areas typically

are not available at analyzer installation sites, the use of a wrist strap connected directly to a

ground is recommended. If a wrist strap is not available, you should at the very least touch the

metal chassis (to ground yourself) before handling or touching the boards.

The optical bench contains an infrared source. Use care when handling the source and adjacent

metal surfaces.

!

CAUTION

!

CAUTION

!

CAUTION

!

CAUTION

x | IPS-4 Analyzer, Infrared Z1/Div1





Schutzerde

CAUTION - Risk of electric shock





CAUTION - Refer to accompanying documents



Achtung (Beachten Sie beiliegende Dokumente)

CAUTION - Hot Surface

(ATTENTION-SURFACE CHAUDE)



Warning Labels

These symbols may appear on the instrument in order to alert you of existing conditions.

Environmental Information (WEEE)

This AMETEK product contains materials that can be reclaimed and recycled. In some cases the

product may contain materials known to be hazardous to the environment or human health.

In order to prevent the release of harmful substances into the environment and to conserve

our natural resources, AMETEK recommends that you arrange to recycle this product when it

reaches its “end of life.”

Waste Electrical and Electronic Equipment (WEEE) should never be disposed of in a municipal

waste system (residential trash). The Wheelie Bin marking on this product is a reminder to

dispose of the product properly after it has completed its useful life and been removed from

service. Metals, plastics and other components are recyclable and you can do your part by one

of the following these steps:

• When the equipment is ready to be disposed of, take it to your local or

regional waste collection administration for recycling.

• In some cases, your “end-of-life” product may be traded in for credit

towards the purchase of new AMETEK instruments. Contact your dealer

to see if this program is available in your area.

• If you need further assistance in recycling your AMETEK product, contact

our ofﬁce listed in the front of the instruction manual.

Contents | xi

Electromagnetic Compatibility (EMC)

Read and follow the recommendations in this section to avoid performance variations or dam-

age to the internal circuits of this equipment when installed in harsh electrical environments.

The various configurations of the IPS-4 Analyzer should not produce, or fall victim to, electro-

magnetic disturbances as specified in the European Union’s EMC Directive (if applicable to your

application). Strict compliance to the EMC Directive requires that certain installation techniques

and wiring practices are used to prevent or minimize erratic behavior of the Analyzer or its elec-

tronic neighbors. Below are examples of the techniques and wiring practices to be followed.

In meeting the EMC requirements, the various analyzer configurations described in this manual

rely heavily on the use of metallic shielded cables used to connect to the customer’s equip-

ment and power. Foil and braid shielded I/O and DC power cables are recommended for use in

otherwise unprotected situations. In addition, hard conduit, flexible conduit, and armor around

non-shielded wiring also provides excellent control of radio frequency disturbances. However,

use of these shielding techniques is effective only when the shielding element is connected to

the equipment chassis/earth ground at both ends of the cable run. This may cause ground loop

problems in some cases. These should be treated on a case-by-case basis. Disconnecting one

shield ground may not provide sufficient protection depending on the electronic environment.

Connecting one shield ground via a 0.1 microfarad ceramic capacitor is a technique allowing

high frequency shield bonding while avoiding the AC-ground metal connection. In the case of

shielded cables the drain wire or braid connection must be kept short. A minimal connection dis-

tance between the shield’s end and the nearest grounded chassis point, ground bar or terminal

is highly recommended. An even greater degree of shield performance can be achieved by using

metallic glands for shielded cable entry into metal enclosures. Expose enough of the braid/foil/

drain where it passes through the gland so that the shield materials can be wrapped backwards

onto the cable jacket and captured inside the gland, and tightened up against the metal interior.

Inductive loads connected to the low voltage “Alarm Contacts” are not recommended. However,

if this becomes a necessity, adhere to proper techniques and wiring practices. Install an appro-

priate transient voltage suppression device (low voltage MOV, “Transzorb,” or R/C) as close as

possible to the inductive device to reduce the generation of transients. Do not run this type of

signal wiring along with other I/O or DC in the same shielded cable. Inductive load wiring must

be separated from other circuits in conduit by using an additional cable shield on the offending

cable.

In general, for optimum protection against high frequency transients and other disturbances, do

not allow installation of this Analyzer where its unshielded I/O and DC circuits are physically

mixed with AC mains or any other circuit that could induce transients into the Analyzer or the

overall system. Examples of electrical events and devices known for the generation of harmful

electromagnetic disturbances include motors, capacitor bank switching, storm related transients,

RF welding equipment, static, and walkie-talkies.

!

CAUTION

xii | IPS-4 Analyzer, Infrared Z1/Div1

SPECIAL WARNINGS AND INFORMATION

Equipment Used in Class I, Division 1 and Zone 1 Hazardous Loca-

tions

Refer to Chapter 2 – Specifications for details about the suitability of this equipment in hazard-

ous areas.

Explosion Hazard – Substitution of Components May Impair Suitability for hazardous loca-

tions.

Risque d’explosion – La substitution de composants peut rendre ce materiel inacceptable pour

les emplacements est designé dangereux.

Explosion Hazard – Do Not Disconnect Equipment Unless Power Has Been Switched Off or

the Area is Known to be Non-Hazardous.

Risque d’explosion – Avant de déconnecter l’équipement, coupez le courant où vous

assurez que l’emplacement est designé non dangereux.

For installations using North American wiring practice, all input and output wiring must be

in accordance with Class I, Division 1 and Zone 1 wiring methods (NEC Sec 501.10(a) and

505.15(b)) or CEC 18-106 or IEC 60079-14) and in accordance with the authority having jurisdic-

tion.

!

WARNING

!

Avertisse-

ment

!

WARNING

!

Avertisse-

ment

Contents | xiii

WARRANTY AND CLAIMS

We warrant that any equipment of our own manufacture or manufactured for us pursuant to our specifications

which shall not be, at the time of shipment thereof by or for us, free from defects in material or workmanship

under normal use and service will be repaired or replaced (at our option) by us free of charge, provided that

written notice of such defect is received by us within twelve (12) months from date of shipment of portable

analyzers or within eighteen (18) months from date of shipment or twelve (12) months from date of instal-

lation of permanent equipment, whichever period is shorter. All equipment requiring repair or replacement

under the warranty shall be returned to us at our factory, or at such other location as we may designate,

transportation prepaid. Such returned equipment shall be examined by us and if it is found to be defective

as a result of defective materials or workmanship, it shall be repaired or replaced as aforesaid. Our obliga-

tion does not include the cost of furnishing any labor in connection with the installation of such repaired

or replaced equipment or parts thereof, nor does it include the responsibility or cost of transportation. In

addition, instead of repairing or replacing the equipment returned to us as aforesaid, we may, at our option,

take back the defective equipment, and refund in full settlement the purchase price thereof paid by Buyer.

Process photometric analyzers, process moisture analyzers, and sample systems are warranted to perform

the intended measurement, only in the event that the customer has supplied, and AMETEK has accepted,

valid sample stream composition data, process conditions, and electrical area classification prior to order

acknowledgment. The photometric light sources are warranted for ninety (90) days from date of shipment.

Resale items warranty is limited to the transferable portion of the original equipment manufacturer’s warranty

to AMETEK. If you are returning equipment from outside the North America, a statement should appear on

the documentation accompanying the equipment being returned declaring that the goods being returned for

repair are North American goods, the name of the firm who purchased the goods, and the shipment date.

The warranty shall not apply to any equipment (or part thereof) which has been tampered with or altered

after leaving our control or which has been replaced by anyone except us, or which has been subject to

misuse, neglect, abuse or improper use. Misuse or abuse of the equipment, or any part thereof, shall be con-

strued to include, but shall not be limited to, damage by negligence, accident, fire or force of the elements.

Improper use or misapplications shall be construed to include improper or inadequate protection against

shock, vibration, high or low temperature, overpressure, excess voltage and the like, or operating the equip-

ment with or in a corrosive, explosive or combustible medium, unless the equipment is specifically designed

for such service, or exposure to any other service or environment of greater severity than that for which the

equipment was designed.

The warranty does not apply to used or secondhand equipment nor extend to anyone other than the origi-

nal purchaser from us. Should the Buyer’s technical staff require the on-site assistance of AMETEK’s agents

or employees for service calls covered by this warranty clause, the Buyer shall pay travel time plus actual

travel and living expenses.

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xiv | IPS-4 Analyzer, Infrared Z1/Div1

Contents | xv

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xvi | IPS-4 Analyzer, Infrared Z1/Div1

Overview | 1-1

OVERVIEW

This chapter discusses the features of the IPS-4 Analyzer and a summary

of how the entire system operates. This chapter also provides an overview

of the AMETEK electronics and sample system, and the various sub-sys-

tems that make up the entire analyzer system.

Principles of Operation

Basic Analytical Theory

The analyzer measures, over one or more bands of wavelength, the

absorbances of ultraviolet radiation (light) by a gas or liquid sample. The

concentrations of the components absorbing the light (absorbers) are then

determined from relationships developed through application of the ideal

gas law and the laws of Bouguer, Beer, and Lambert.

Thus, the absorbance, A, due to a single absorber is,

where l is the path length of the light in the fluid sample, [x] is the con-

centration (mole percent) of absorber x,

kλ

is the molar absorptivity of

absorber x at the measuring wavelength, T and P are the temperature

and pressure of the fluid sample, respectively, and R is the universal fluid

constant.

If more than one component is present, the total absorbance at a given

wavelength is the sum of the absorbances of the individual components.

In this case, absorbance measurements at additional wavelengths are re-

quired to develop a system of linear equations. If the number of measured

wavelengths is equal to or greater than the number of components be-

ing measured, absorbances of each component may be determined using

standard methods of linear algebra.

In practice, several wavelengths are used to calculate concentration [x].

Methods are implemented to correct for non-linearity.

1-2 | IPS-4 Analyzer, Infrared Z1/Div1

The Implementation

The analyzer contains an optical bench consisting of a filter wheel, up to

six band-pass optical filters,infrared source, and lead selenide detector as

indicated in Figure 1-1.

The Measuring Cell is contained within the Oven/Sample System Enclo-

sure, which can also contain optional sample system components such as

a heater, an aspirator, a Span fluid inlet, filter (liquid trap), and flow indi-

cator (or meter). An optional pressure transducer can be used to monitor

the pressure at the outlet of the Measuring Cell.

Optical System and Measurement

The Infrared Source emits through the visible, near infrared, and infrared

wavelengths.

Initially, the light passes through a collimating lens and a rotating filter

wheel. The filter wheel contains from one to six bandpass filters. As a filter

rotates into line with the collimated beam, it passes through the sample

cell, reflects off two gold mirrors, and returns to strike the PbSe detector.

Overview | 1-3

Figure 1-1.

Analyzer light path

schematic.

Sample System

The sample system is contained within an attached but separate, insulated

enclosure (Oven/Sample System Enclosure). If this enclosure is heated,

components within this enclosure are specified to operate at temperatures

of up to 150 °C.

The system components are configurable for both gas and liquid applica-

tions. A typical configuration for the sample system contains the connec-

tions for the inlet and outlet sample lines, the Measuring Cell, an aspirator

(gas applications only) to drive the sample fluid through the system, a

Zero Fluid inlet, and a Span Fluid inlet. The system may also contain pres-

sure sensors/indicators, a filter, and other application-dependent compo-

nents. Information about specific (or optional) components that make up

your sample system – if applicable – are included in a separate Manual

Supplement document, located in the “Supplemental Information” tab of

this manual or the Documentation Package shipped with the analyzer.

1-4 | IPS-4 Analyzer, Infrared Z1/Div1

Electronics

The lead selenide detector along with a low-noise preamplifier is mount-

ed in-line with the collimated beam returned from the sample cell. The

preamplifier is wired to the NDIR interface board where it is further con-

ditioned and converted into a digital signal. The digital signal is passed to

the main MCU for analysis.

The NDIR interface board also drives both the stepper motor and infrared

source. An optical interrupter is used to sense the home position of the

filter wheel for synchronization.

The main functions of the processors are to:

• Control the lamp and stepper motor position.

• Monitor and control temperatures in the Oven/Sample System Enclo-

sure (if required).

• Monitor sample system pressure.

• Monitor alarm relays and other system health.

• Control the sample system including valves, etc.

• Calculate the fluid absorbances and concentrations.

For external communication, RS232, RS485, and Ethernet ports are avail-

able. Analog signals are also available to the customer through configu-

rable 0–20 mA or 4–20 mA outputs.

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