Thermo 42i Instruction Manual

Model 42i

Low Source

Instruction Manual

Chemiluminescence NO-NO
Part number 102031-00
30May2006

2-NOx Analyzer

© 2005 Thermo Electron Corporation. All rights reserved.

“Analyze. Detect. Measure. Control” is a trademark of Thermo Electron Corporation. All other product names and
logos are the property of their respective owner.

Specifications, terms and pricing are subject to change. Not all products are available in all countries. Please consult
your local sales representative for details.

WEEE Compliance

This product is required to comply with the European Union’s Waste
Electrical & Electronic Equipment (WEEE) Directive 2002/96/EC. It is
marked with the following symbol:

Thermo Electron has contracted with one or more recycling/disposal
companies in each EU Member State, and this product should be disposed
of or recycled through them. Further information on Thermo Electron’s
compliance with these Directives, the recyclers in your country, and
information on Thermo Electron products which may assist the detection of
substances subject to the RoHS Directive are available at:
www.thermo.com/WEEERoHS.

Thermo Electron Corporation WEEE Compliance

WEEE Compliance

WEEE Compliance Thermo Electron Corporation

Contents

Chapter 1 Introduction......................................................................................1-1

Principle of Operation ............................................................1-2

Specifications ..........................................................................1-3

Chapter 2 Installation .......................................................................................2-1

Lifting.....................................................................................2-1

Unpacking and Inspection ......................................................2-1

Setup Procedure......................................................................2-3

Startup ....................................................................................2-5

Chapter 3 Operation ..........................................................................................3-1

Display....................................................................................3-2

Pushbuttons............................................................................3-3

Soft Keys..............................................................................3-4

Software Overview ..................................................................3-4

Power-Up Screen .................................................................3-6

Run Screen...........................................................................3-6

Main Menu..........................................................................3-7

Range Menu ...........................................................................3-8

Single Range Mode ..............................................................3-8

Dual Range Mode..............................................................3-10

Auto Range Mode..............................................................3-11

Gas Units...........................................................................3-14

NO, NO2, and NOx Ranges..............................................3-14

Set Custom Ranges ............................................................3-16

Averaging Time.....................................................................3-17

Calibration Factors Menu .....................................................3-18

NO and NOx Backgrounds................................................3-19

NO, NO

Calibration Pressure ...........................................................3-22

Calibration Menu .................................................................3-23

Calibrate NO and NOx Background..................................3-24

Calibrate NO, NO

Calibrate Pressure...............................................................3-26

Zero/Span Check ...............................................................3-26

, and NOx Coefficients ......................................3-21

2

, and NOx Coefficients .......................3-25

2

Thermo Electron Corporation Model 42i Low Source Instruction Manual v

Contents

Instrument Controls Menu ...................................................3-30

Ozonator............................................................................3-30

PMT Supply ......................................................................3-31

Auto/Manual Mode ...........................................................3-31

Datalogging Settings ..........................................................3-32

Communication Settings....................................................3-42

I/O Configuration..............................................................3-50

Temperature Compensation...............................................3-62

Pressure Compensation ......................................................3-63

Screen Contrast..................................................................3-64

Service Mode .....................................................................3-64

Date/Time .........................................................................3-65

Diagnostics Menu .................................................................3-65

Program Version ................................................................3-66

Voltages .............................................................................3-66

Temperatures .....................................................................3-68

Pressure..............................................................................3-68

Flow...................................................................................3-68

Analog Input Readings.......................................................3-69

Analog Input Voltages........................................................3-69

Digital Inputs.....................................................................3-70

Relay States ........................................................................3-70

Test Analog Outputs..........................................................3-70

Instrument Configuration..................................................3-72

Contact Information..........................................................3-72

Alarms Menu ........................................................................3-73

Internal Temperature .........................................................3-74

Chamber Temperature.......................................................3-75

Cooler Temperature...........................................................3-76

Converter Temperature......................................................3-77

Pressure..............................................................................3-78

Ozonator Flow...................................................................3-79

Zero and Span Check.........................................................3-79

Zero and Span Auto Calibration ........................................3-80

NO, NO

, and NOx Concentration ..................................3-80

2

vi Model 42i Low Source Instruction Manual Thermo Electron Corporation

Contents

Service Menu ........................................................................3-82

PMT Voltage Adjustment..................................................3-83

Range Mode Select.............................................................3-83

Converter Set Temperature................................................3-84

Pressure Calibration ...........................................................3-84

Input Board Calibration.....................................................3-87

Temperature Calibration....................................................3-89

Analog Output Calibration ................................................3-90

Analog Input Calibration ...................................................3-92

Ozonator Safety .................................................................3-94

Extended Ranges................................................................3-94

Dilution Ratio....................................................................3-95

Display Pixel Test ..............................................................3-95

Restore User Defaults.........................................................3-96

Password ...............................................................................3-97

Set Password ......................................................................3-97

Lock Instrument ................................................................3-98

Change Password ...............................................................3-98

Remove Password...............................................................3-99

Unlock Instrument ............................................................3-99

Chapter 4 Calibration........................................................................................4-1

Equipment Required...............................................................4-1

Pre-Calibration .......................................................................4-1

Calibration..............................................................................4-2

Connecting the GPT Apparatus...........................................4-3

Dynamic Parameter Specifications for Gas Phase Titrator....4-4

Adjusting Instrument Gain ..................................................4-6

Preparing NO, NOx, and NO2 Calibration Curves .............4-9

Calibration in Dual Range and Auto Range Mode................4-12

Calibrate Low NO .............................................................4-13

Calibrate Low NOx............................................................4-13

Calibrate Low NO2............................................................4-14

Calibrate High NO............................................................4-15

Calibrate High NO

Calibrate High NO

..........................................................4-15

x

..........................................................4-16

2

Zero and Span Check............................................................4-16

Chapter 5 Preventive Maintenance ...............................................................5-1

Safety Precautions ...................................................................5-1

Replacement Parts...................................................................5-2

Cleaning the Outside Case......................................................5-2

Ozonator Air Feed Drying Column Replacement ...................5-2

Capillaries Inspection and Replacement ..................................5-2

Thermo Electron Corporation Model 42i Low Source Instruction Manual vii

Contents

Thermoelectric Cooler Fins Inspection and Cleaning..............5-4

Fan Filters Inspection and Cleaning........................................5-4

Pump Rebuilding....................................................................5-5

Chapter 6 Troubleshooting.............................................................................. 6-1

Safety Precautions ...................................................................6-1

Troubleshooting Guides..........................................................6-2

Board-Level Connection Diagrams .........................................6-6

Connector Pin Descriptions....................................................6-8

Service Locations...................................................................6-22

Chapter 7 Servicing.......................................................................................... 7-1

Safety Precautions ...................................................................7-3

Firmware Updates...................................................................7-5

Replacement Parts List............................................................7-5

Cable List................................................................................7-6

Removing the Measurement Bench and

Lowering the Partition Panel...................................................7-8

Pump Replacement...............................................................7-11

Fan Replacement...................................................................7-12

PMT Cooler and Reaction Chamber Assembly Replacement 7-13

Photomultiplier Tube Replacement ......................................7-15

PMT High Voltage Power Supply Replacement ...................7-16

PMT Voltage Adjustment.....................................................7-18

Reaction Chamber Cleaning or Removal ..............................7-19

NO2-to-NO Converter Replacement....................................7-21

Solenoid Valve Replacement .................................................7-23

Ozonator Assembly Replacement..........................................7-24

Ozonator Transformer Replacement .....................................7-26

Input Board Replacement .....................................................7-26

Input Board Calibration........................................................7-28

DC Power Supply Replacement ............................................7-29

Analog Output Testing .........................................................7-30

Analog Output Adjustment...................................................7-32

Pressure Transducer Assembly Replacement..........................7-33

Pressure Transducer Calibration ...........................................7-35

Temperature Control Board Replacement.............................7-37

Ambient Temperature Calibration ........................................7-37

Fuse Replacement .................................................................7-39

Scrubber Replacement...........................................................7-39

I/O Expansion Board (Optional) Replacement .....................7-40

Digital Output Board Replacement.......................................7-42

Motherboard Replacement....................................................7-42

Measurement Interface Board Replacement ..........................7-43

viii Model 42i Low Source Instruction Manual Thermo Electron Corporation

Contents

Front Panel Board Replacement............................................7-45

LCD Module Replacement ...................................................7-46

Service Locations...................................................................7-47

Chapter 8 System Description.........................................................................8-1

Hardware ................................................................................8-1

NO2-to-NO Converter...........................................................8-2

Mode Solenoid.....................................................................8-2

Reaction Chamber ...............................................................8-2

Optical Filter .......................................................................8-3

Pressure Transducer .............................................................8-3

Ozonator.................................................................................8-3

Ozonator Flow Switch .........................................................8-3

Photomultiplier Tube .............................................................8-3

Photomultiplier Tube Cooler..................................................8-3

Pump ......................................................................................8-3

Sample Capillary..................................................................8-3

Dry Air Capillary .................................................................8-4

Ammonia Scrubber .................................................................8-4

Software..................................................................................8-4

Instrument Control..............................................................8-4

Monitoring Signals...............................................................8-4

Measurement Calculations ...................................................8-5

Output Communication......................................................8-5

Electronics ..............................................................................8-6

Motherboard........................................................................8-6

Measurement Interface Board ..............................................8-7

Pressure Sensor Assembly .....................................................8-7

Temperature Control Board.................................................8-8

PMT Power Supply Assembly..............................................8-8

Input Board Assembly..........................................................8-8

Digital Output Board...........................................................8-8

I/O Expansion Board (Optional) .........................................8-9

Front Panel Connector Board ..............................................8-9

I/O Components ....................................................................8-9

Analog Voltage Outputs.......................................................8-9

Analog Current Outputs (Optional) ..................................8-10

Analog Voltage Inputs (Optional)......................................8-10

Digital Relay Outputs ........................................................8-10

Digital Inputs.....................................................................8-11

Serial Ports.........................................................................8-11

RS-232 Connection ...........................................................8-11

RS-485 Connection ...........................................................8-12

Ethernet Connection..........................................................8-12

External Accessory Connector ............................................8-12

Thermo Electron Corporation Model 42i Low Source Instruction Manual ix

Contents

Chapter 9 Optional Equipment........................................................................ 9-1

Internal Zero/Span and Sample Valves....................................9-1

Permeation Dryer Assembly ....................................................9-2

Teflon Particulate Filter ..........................................................9-2

Ozone Particulate Filter ..........................................................9-2

NO2-to-NO Converters..........................................................9-3

I/O Expansion Board Assembly...............................................9-3

Terminal Block and Cable Kits ...............................................9-3

Mounting Options..................................................................9-4

Appendix A Warranty............................................................................................ A-1

Appendix B C-Link Protocol Commands............................................................ B-1

Instrument Identification Number......................................... B-2

Commands ............................................................................ B-2

Measurements........................................................................ B-9

Alarms.................................................................................. B-12

Diagnostics .......................................................................... B-16

Datalogging ......................................................................... B-16

Calibration........................................................................... B-23

Keys/Display........................................................................ B-26

Measurement Configuration ................................................ B-28

Hardware Configuration...................................................... B-32

Communications Configuration .......................................... B-35

I/O Configuration................................................................ B-39

Record Layout Definition .................................................... B-44

Format Specifier for ASCII Responses............................... B-44

Format Specifier for Binary Responses .............................. B-44

Format Specifier for Front-Panel Layout .......................... B-45

Appendix C MODBUS Protocol ........................................................................... C-1

Serial Communication Parameters .........................................C-2

TCP Communication Parameters ..........................................C-2

Application Data Unit Definition .......................................... C-2

Function Codes...................................................................... C-3

MODBUS Commands Supported......................................... C-8

Appendix D Geysitech (Bayern-Hessen) Protocol...........................................D-1

x Model 42i Low Source Instruction Manual Thermo Electron Corporation

Figures

Figures

Model 42i Low Source Flow Schematic ...................................1-3

Remove the Packing Material ..................................................2-2

Remove the Shipping Screws ...................................................2-2

Model 42i Low Source Rear Panel ...........................................2-4

Atmospheric Dump Bypass Plumbing .....................................2-4

42i Low Source Front Panel Display .......................................3-2

Front Panel Pushbuttons .........................................................3-3

Flowchart of Menu-Driven Software .......................................3-5

Pin-Out of Rear Panel Connector in Single Range Mode ........3-9

Pin-Out of Rear Panel Connector in Dual Range Mode ........3-10

Analog Output in Auto Range Mode ....................................3-12

Pin-Out of Rear Panel Connector in Auto Range Mode ........3-13

GPT System ............................................................................4-4

Inspecting and Replacing the Capillaries .................................5-3

Rebuilding the Pump ..............................................................5-6

Board-Level Connection Diagram - Common Electronics .......6-6

Board-Level Connection Diagram - Measurement System ......6-7

Properly Grounded Antistatic Wrist Strap ...............................7-4

Component Layout .................................................................7-7

Remove the Measurement Bench Screws .................................7-8

Slide Out the Measurement Bench ..........................................7-9

Lower the Partition Panel ......................................................7-10

Replacing the Pump ..............................................................7-12

Replacing a Fan .....................................................................7-13

PMT Cooler and Reaction Chamber .....................................7-14

Replacing the PMT ...............................................................7-16

Replacing the PMT HVPS ....................................................7-17

Cleaning or Removing the Reaction Chamber ......................7-20

-to-NO Moly Converter Assembly ................................7-22

NO

2

Replacing the Solenoid Valve ................................................7-24

Replacing the Ozonator Assembly .........................................7-25

Replacing the Input Board ....................................................7-27

Replacing the DC Power Supply ...........................................7-30

Rear Panel Analog Voltage Output Pins ................................7-31

Replacing the Pressure Transducer ........................................7-34

Replacing the Scrubber ..........................................................7-40

Replacing the I/O Expansion Board (Optional) ....................7-41

Rear Panel Board Connectors ................................................7-41

Replacing the Measurement Interface Board .........................7-44

Replacing the Front Panel Board and the LCD Module ........7-45

Hardware Components ...........................................................8-2

Flow Diagram, Zero/Span Option ..........................................9-2

Thermo Electron Corporation Model 42i Low Source Instruction Manual xi

Figures

Rack Mount Option Assembly ................................................9-4

Bench Mounting .....................................................................9-5

EIA Rack Mounting ................................................................9-6

Retrofit Rack Mounting ..........................................................9-7

Flag Status ............................................................................ B-12

xii Model 42i Low Source Instruction Manual Thermo Electron Corporation

Tables

Tables

Model 42i Low Source Specifications ....................................................... 1-3

Front Panel Pushbuttons .......................................................................... 3-3

Default Analog Outputs in Single Range Mode ....................................... 3-9

Default Analog Outputs in Dual Range Mode ....................................... 3-11

Default Analog Outputs in Auto Range Mode ....................................... 3-13

Standard Ranges ..................................................................................... 3-15

Extended Ranges .................................................................................... 3-16

Analog Output Zero to Full-Scale Table ................................................ 3-56

Signal Type Group Choices ................................................................... 3-57

Troubleshooting - General Guide ............................................................ 6-2

Troubleshooting - Alarm Messages ........................................................... 6-3

Motherboard Connector Pin Descriptions ............................................... 6-8

Measurement Interface Board Connector Pin Descriptions .................... 6-13

Front Panel Board Connector Pin Diagram ........................................... 6-16

I/O Expansion Board (Optional) Connector Pin Descriptions ............... 6-18

Digital Output Board Connector Pin Descriptions ................................ 6-19

Input Board Connector Pin Descriptions ............................................... 6-20

Temperature Control Board Connector Pin Descriptions ...................... 6-21

Model 42i Low Source Replacement Parts ............................................... 7-5

Model 42i Low Source Cables .................................................................. 7-6

Analog Output Channels and Rear Panel Pin Connections .................... 7-31

RS-232 DB Connector Pin Configurations ............................................ 8-12

RS-485 DB Connector Pin Configuration ............................................. 8-12

Mounting Options ................................................................................... 9-4

C-Link Protocol Commands .................................................................... B-3

Averaging Times ......................................................................................B-9

Alarm Trigger Values .............................................................................B-15

Record Output Formats ......................................................................... B-20

Stream Time Values ...............................................................................B-23

Standard Ranges .....................................................................................B-29

Extended Ranges .................................................................................... B-29

Contrast Levels .......................................................................................B-32

Reply Termination Formats ................................................................... B-38

Analog Current Output Range Values ...................................................B-40

Analog Voltage Output Range Values ....................................................B-40

Default Output Assignment ................................................................... B-42

Read Coils for 42i Low Source .................................................................C-8

Read Registers for 42i Low Source ...........................................................C-9

Write Coils for 42i Low Source ..............................................................C-10

Operating Status for Model 42i Low Source ...........................................D-7

Error Status for Model 42i Low Source ................................................... D-7

Thermo Electron Corporation Model 42i Low Source Instruction Manual xiii

Tables

xiv Model 42i Low Source Instruction Manual Thermo Electron Corporation

About This Manual

This manual provides information about operating, maintaining, and
servicing the analyzer. It also contains important alerts to ensure safe
operation and prevent equipment damage. The manual is organized into the
following chapters and appendices to provide direct access to specific
operation and service information:

• Chapter 1 “Introduction” provides an overview of product features,
describes the principles of operation, and lists the specifications.

• Chapter 2 “Installation” describes how to unpack, setup, and startup the
analyzer.

• Chapter 3 “Operation” describes the front panel display, the front panel
pushbuttons, and the menu-driven software.

• Chapter 4 “Calibration” provides the procedures for calibrating the
analyzer and describes the required equipment.

• Chapter 5 “Preventive Maintenance” provides maintenance procedures
to ensure reliable and consistent instrument operation.

• Chapter 6 “Troubleshooting” presents guidelines for diagnosing analyzer
failures, isolating faults, and includes recommended actions for restoring
proper operation.

• Chapter 7 “Servicing” presents safety alerts for technicians working on
the analyzer, step-by-step instructions for repairing and replacing
components, and a replacement parts list. It also includes contact
information for product support and technical information.

• Chapter 8 “System Description” describes the function and location of
the system components, provides an overview of the software structure,
and includes a description of the system electronics and input/output
connections.

• Chapter 9 “Optional Equipment” describes the optional equipment that
can be used with this analyzer.

• Appendix A “Warranty” provides a copy of the warranty statement.

Thermo Electron Corporation Model 42i Low Source Instruction Manual xv

Preface

Safety

• Appendix B “C-Link Protocol Commands” provides a description of the
C-Link protocol commands that can be used to remotely control an
analyzer using a host device such as a PC or a datalogger.

• Appendix C “MODBUS Protocol” provides a description of the
MODBUS Protocol Interface and is supported both over RS-232/485
(RTU protocol) as well as TCP/IP over Ethernet.

Safety Review the following safety information carefully before using the analyzer.

This manual provides specific information on how to operate the analyzer,
however if the analyzer is used in a manner not specified by the
manufacturer, the protection provided by the equipment may be impaired.

Safety and Equipment

Damage Alerts

This manual contains important information to alert you to potential safety
hazards and risks of equipment damage. Refer to the following types of
alerts you may see and the actual alerts that appear in this manual.

Safety and Equipment Damage Alert Descriptions

Alert Description

DANGER A hazard is present that will result in death or serious

personal injury if the warning is ignored.

WARNING A hazard is present or an unsafe practice can result in

serious personal injury if the warning is ignored.

CAUTION The hazard or unsafe practice could result in minor to

moderate personal injury if the warning is ignored.

Equipment Damage The hazard or unsafe practice could result in property

damage if the warning is ignored.









xvi Model 42i Low Source Instruction Manual Thermo Electron Corporation

Safety and Equipment Damage Alerts in this Manual

Alert Description

WARNING If the equipment is operated in a manner not specified by

the manufacturer, the protection provided by the
equipment may be impaired.

The service procedures in this manual are restricted to
qualified service personnel only.

The Model 42i Low Source is supplied with a three-wire
grounding cord. Under no circumstances should this
grounding system be defeated.

CAUTION If the LCD panel breaks, do not to let the liquid crystal

contact your skin or clothes. If the liquid crystal contacts
your skin or clothes, wash it off immediately using soap
and water.

Avoid contact with converter heated components. Allow
converter to cool to room temperature before handling
converter components.





Preface

Safety







Equipment Damage Do not attempt to lift the analyzer by the cover or other

external fittings.

This adjustment should only be performed by an
instrument service technician.

Some internal components can be damaged by small
amounts of static electricity. A properly grounded
antistatic wrist strap must be worn while handling any
internal component.

Handle all printed circuit boards by the edges only. 

Do not point the photomultiplier tube at a light source.
This can permanently damage the tube.

Do not remove the panel or frame from the LCD module.



The LCD module polarizing plate is very fragile, handle it
carefully.

Do not wipe the LCD module polarizing plate with a dry
cloth, it may easily scratch the plate.

Do not use alcohol, acetone, MEK or other Ketone based
or aromatic solvents to clean the module, use a soft
cloth moistened with a naphtha cleaning solvent.

Do not place the LCD module near organic solvents or
corrosive gases.

Do not shake or jolt the LCD module. 

















Thermo Electron Corporation Model 42i Low Source Instruction Manual xvii

Preface

Where to Get Help

WEEE Symbol The following symbol and description identify the WEEE marking used on

the instrument and in the associated documentation.

Symbol Description

Marking of electrical and electronic equipment which applies to
electrical and electronic equipment falling under the Directive
2002/96/EC (WEEE) and the equipment that has been put on the market
after 13 August 2005.

Where to Get Help Service is available from exclusive distributors worldwide. Contact one of

the phone numbers below for product support and technical information.

866-282-0430 Toll Free

508-520-0430 International

Thermo Electron Corporation Model 42i Low Source Instruction Manual xviii

Chapter 1 Introduction

The Model 42i Low Source Chemiluminescence NO-NO2-NOx Analyzer
combines proven detection technology, easy to use menu-driven software,
and advanced diagnostics to offer unsurpassed flexibility and reliability. The
Model 42i Low Source has the following features:

• 320 x 240 graphics display

• Menu-driven software

• Field programmable ranges

• User-selectable single/dual/auto range modes

• Multiple user-defined analog outputs

• Analog input options

• High sensitivity

• Fast response time

• Linearity through all ranges

• Independent NO-NO

• Replaceable NO

2

-NOx ranges

2

converter cartridge

• User-selectable digital input/output capabilities

• Standard communications features include RS232/485 and Ethernet

• C-Link, MODBUS, and streaming data protocols

For details of the analyzer’s principle of operation and product
specifications, see the following topics:

• “Principle of Operation” on page 1-2 describes the principles by which
your analyzer operates.

Thermo Electron Corporation 42i Low Source Instruction Manual 1-1

Introduction

Principle of Operation

• “Specifications” on page 1-3 is a list of the analyzer’s performance
specifications.

Thermo Electron is pleased to supply this chemiluminescence
NO-NO2-NOx analyzer. We are committed to the manufacture of
instruments exhibiting high standards of quality, performance, and
workmanship. Service personnel are available for assistance with any
questions or problems that may arise in the use of this analyzer. For more
information on servicing, see Chapter 7, “Servicing”.

Principle of Operation The Model 42i Low Source operates on the principle that nitric oxide (NO)

and ozone (O3) react to produce a characteristic luminescence with an
intensity linearly proportional to the NO concentration. Infrared light
emission results when electronically excited NO2 molecules decay to lower
energy states. Specifically,

υ

hONOO NO

++→+

223

Nitrogen dioxide (NO2) must first be transformed into NO before it can be
measured using the chemiluminescent reaction. NO2 is converted to NO by
a stainless steel NO2-to-NO converter heated to about 625 °C (the optional
molybdenum converter is heated to 325 °C).

The ambient air sample is drawn into the Model 42i Low Source through
the sample bulkhead, as shown in Figure 1-1. The sample flows through a
capillary, and then to the mode solenoid valve. The solenoid valve routes the
sample either straight to the reaction chamber (NO mode) or through the
NO2-to-NO converter and then to the reaction chamber (NOx mode). A
flow sensor prior to the reaction chamber measures the sample flow.

Dry air enters the Model 42i Low Source through the dry air bulkhead,
passes through a flow switch, and then through a silent discharge ozonator.
The ozonator generates the ozone needed for the chemiluminescent
reaction. At the reaction chamber, the ozone reacts with the NO in the
sample to produce excited NO

molecules. A photomultiplier tube (PMT)

2

housed in a thermoelectric cooler detects the luminescence generated during
this reaction. From the reaction chamber, the exhaust travels through the
ozone (O3) converter to the pump, and is released through the vent.

The NO and NO

concentrations calculated in the NO and NOx modes

x

are stored in memory. The difference between the concentrations is used to
calculate the NO2 concentration. The Model 42i Low Source outputs NO,

1-2 42i Low Source Instruction Manual Thermo Electron Corporation

Introduction

Specifications

NO2, and NOx concentrations to the front panel display, the analog
outputs, and also makes the data available over the serial or ethernet
connection.

Figure 1-1. Model 42i Low Source Flow Schematic

Specifications Table 1-1. Model 42i Low Source Specifications

Preset ranges 0-0.2, 0.5, 1, 2, 5, 10, 20, 50, 100 ppm

0-0.5, 1, 2, 5, 10, 20, 50, 100, 150 mg/m

Extended ranges 0-1, 2, 5, 10, 20, 50, 100, 200, 500 ppm

0-2, 5, 10, 20, 50, 100, 200, 500, 750 mg/m

Custom ranges 0-0.2 to 100 ppm (0-1 to 500 ppm in extended ranges)

0-0.5 to 150 mg/m

Zero noise 0.005 ppm RMS (60 second averaging time)

Lower detectable limit 0.01 ppm (60 second averaging time)

Zero drift (24 hour) ≈ 0.005 ppm

Span drift (24 hour) ±

Response time

(NO/NO

mode)

x

1% full-scale

15 sec (10 second averaging time)

85 sec (60 second averaging time)

305 sec (300 second averaging time)

3

(0-2 to 750 mg/m3 in extended ranges)

3

3

Thermo Electron Corporation 42i Low Source Instruction Manual 1-3

Introduction

Specifications

Response time

(NO mode)

15 sec (10 second averaging time)

65 sec (60 second averaging time)

305 sec (300 second averaging time)

Linearity ±

1% full-scale

Sample flow rate ≈ 25 cc/min. measured at atmospheric pressure

Operating temperature

15–35 °C (may be safely operated over the range of 0–45 °C)

*

Power requirements 100 VAC @ 50/60 Hz

115 VAC @ 50/60 Hz

220

–240 VAC @ 50/60 Hz

300 watts

Physical dimensions 16.75” (W) X 8.62” (H) X 23” (D)

Weight Approximately 55 lbs.

Analog outputs 6 voltage outputs; 0

–100 mV, 1 V, 5 V, 10 V (User selectable), 5% of

full-scale over/under range, 12 bit resolution, user selectable for
measurement input

Digital outputs 1 power fail relay Form C, 10 digital relays Form A, user selectable

alarm output, relay logic, 100 mA @ 200 VDC

Digital inputs 16 digital inputs, user select programmable, TTL level, pulled high

Serial Ports 1 RS-232 or RS-485 with two connectors, baud rate 1200

–115200,

data bits, parity, and stop bits, protocols: C-Link, MODBUS, and
streaming data (all user selectable)

Ethernet connection RJ45 connector for 10Mbs Ethernet connection, static or dynamic

TCP/IP addressing

*

In non condensing environments. Performance specifications based on operation in 15–35 °C range.

1-4 42i Low Source Instruction Manual Thermo Electron Corporation

Chapter 2 Installation

Installing the Model 42i Low Source includes the following
recommendations and procedures:

• “Lifting” on page 2-1

• “Unpacking and Inspection” on page 2-1

• “Setup Procedure” on page 2-3

• “Startup” on page 2-5

Lifting When lifting the instrument, use procedure appropriate to lifting a heavy

object, such as, bending at the knees while keeping your back straight and
upright. Grasp the instrument at the bottom in the front and at the rear of
the unit. Although one person can lift the unit, it is desirable to have two
persons lifting, one by grasping the bottom in the front and the other by
grasping the bottom in the rear.

Unpacking and

Inspection

Equipment Damage Do not attempt to lift the instrument by the cover or

other external fittings. 

The Model 42i Low Source is shipped complete in one container. If there is
obvious damage to the shipping container when you receive the instrument,
notify the carrier immediately and hold for inspection. The carrier is
responsible for any damage incurred during shipment.

Use the following procedure to unpack and inspect the instrument.

1. Remove the instrument from the shipping container and set it on a table
or bench that allows easy access to both the front and rear.

2. Remove the cover to expose the internal components.

Thermo Electron Corporation Model 42i Low Source Instruction Manual 2-1

Installation

Unpacking and Inspection

3. Remove the packing material.

Remove Packing
(2 pieces)

Remove Packing
(2 pieces)

Units without Optional I/O Board

Units with Optional I/O Board

Figure 2-1. Remove the Packing Material

4. Remove the three shipping screws (Figure 2-2).

Shipping Screws (3)

Figure 2-2. Remove the Shipping Screws

5. Check for possible damage during shipment.

6. Check that all connectors and circuit boards are firmly attached.

2-2 Model 42i Low Source Instruction Manual Thermo Electron Corporation

7. Re-install the cover.

Setup Procedure Use the following procedure to setup the instrument.

1. Connect the sample line to the SAMPLE bulkhead on the rear panel
(Figure 2-3). Ensure that the sample line is not contaminated by dirty,
wet, or incompatible materials. All tubing should be constructed of FEP
Teflon®, 316 stainless steel, borosilicate glass, or similar tubing with an
OD of 1/4-inch and a minimum ID of 1/8-inch. The length of the
tubing should be less than 10 feet.

Note Gas must be delivered to the instrument at atmospheric pressure. It
may be necessary to use an atmospheric bypass plumbing arrangement as
shown in Figure 2-4 if gas pressure is greater than atmospheric pressure. 

2. Connect the air dryer to the DRY AIR bulkhead.

Installation

Setup Procedure

3. Connect the EXHAUST bulkhead to a suitable vent or ozone scrubber.
The exhaust line should be 1/4-inch OD with a minimum ID of
1/8-inch. The length of the exhaust line should be less than 10 feet.
Verify that there is no restriction in this line.

4. Connect a suitable recording device to the rear panel connector. See the
“Operation” chapter for more information about the rear panel
pin-outs.

5. Plug the instrument into an outlet of the appropriate voltage and
frequency.

WARNING The Model 42i Low Source is supplied with a three-wire
grounding cord. Under no circumstances should this grounding system
be defeated. 

Thermo Electron Corporation Model 42i Low Source Instruction Manual 2-3

Installation

Setup Procedure

Figure 2-3. Model 42i Low Source Rear Panel

Instrument Bulkhead

SAMPLE

Figure 2-4. Atmospheric Dump Bypass Plumbing

Vent to Exhaust Line
at Atmospheric Pressure

Input Gas Line

2-4 Model 42i Low Source Instruction Manual Thermo Electron Corporation

Startup Use the following procedure when starting the instrument.

1. Turn the power ON.

2. Allow 90 minutes for the instrument to stabilize.

Note It is best to turn the ozonator on and let the instrument run overnight
before calibration in order to obtain the most accurate information. 

3. Set instrument parameters such as operating ranges and averaging times
to appropriate settings. For more information about instrument
parameters, see the “Operation” chapter.

4. Before beginning actual instrument monitoring, perform a multipoint
calibration as described in the “Calibration” chapter.

Installation

Startup

Thermo Electron Corporation Model 42i Low Source Instruction Manual 2-5

Installation

Startup

2-6 Model 42i Low Source Instruction Manual Thermo Electron Corporation

Chapter 3 Operation

This chapter describes the front panel display, front panel pushbuttons, and
menu-driven software.

• “Display” on page 3-2 describes the LCD graphics display.

• “Pushbuttons” on page 3-3 describes the various front panel
pushbuttons and the expected key actions for each.

• “Software Overview” on page 3-4 describes the menu-driven software
and submenus.

• “Range Menu” on page 3-8 describes the gas units, NO- NO2 -NOx
ranges, and custom ranges.

• “Averaging Time” on page 3-17 describes the averaging period applied
to NO, NO2, and NOx measurements.

• “Calibration Factors Menu” on page 3-18 describes the calibration
factors used to correct NO, NO2, and NOx measurement readings.

• “Calibration Menu” on page 3-23 describes calibration of zero and span.

• “Instrument Controls Menu” on page 3-30 describes the instrument
hardware control and configuration.

• “Diagnostics Menu” on page 3-65 describes the diagnostic information
and functions.

• “Alarms Menu” on page 3-73 describes a list of items that are monitored
by the analyzer.

• “Service Menu” on page 3-82 describes service related menu items.

• “Password” on page 3-97 describes how to enter/change a password,
lock and unlock the instrument.

Thermo Electron Corporation Model 42i Low Source Instruction Manual 3-1

Operation

Display

Display The 320 x 240 graphics liquid-crystal display (LCD) shows the sample

concentrations, instrument parameters, instrument controls, help, and error
messages. Some menus contain more items than can be displayed at one
time. For these menus, use and to move the cursor up and
down to each item.

Figure 3-1. 42i Low Source Front Panel Display

CAUTION If the LCD panel breaks, do not let the liquid crystal contact your

skin or clothes. If the liquid crystal contacts your skin or clothes, wash it off
immediately using soap and water.

3-2 Model 42i Low Source Instruction Manual Thermo Electron Corporation



Pushbuttons

Pushbuttons The Pushbuttons allow the user to traverse the various screens/menus.

Figure 3-2. Front Panel Pushbuttons

Operation

Table 3-1. Front Panel Pushbuttons

= Soft Keys The soft keys are used to provide shortcuts that

allow the user to jump to user-selectable menu screens. For
more information on processing soft keys, see “Soft Keys”
below.

= Run The is used to display the Run screen. The Run

screen normally displays the NO, NO
concentrations.

= Menu The is used to display the Main Menu when in the

Run screen, or back up one level in the menu system. For
more information about the Main Menu, see “Main Menu”
later in this chapter.

= Help The is context-sensitive, that is, it provides

additional information about the screen that is being
displayed. Press for a brief explanation about the
current screen or menu. Help messages are displayed using
lower case letters to easily distinguish them from the
operating screens. To exit a help screen, press or

return to the Run screen.

, and NOx

2

to return to the previous screen, or to

= Up, Down

= Left, Right

= Enter The is used to select a menu item,

Thermo Electron Corporation Model 42i Low Source Instruction Manual 3-3

The four arrow pushbuttons ( , , ,
and ) move the cursor up, down, left, and right or
change values and states in specific screens.

accept/set/save a change, and/or toggle on/off functions.

Operation

Software Overview

Soft Keys The Soft Keys are multi-functional keys that use part of the display to

identify their function at any moment. The function of the soft keys allow
immediate access to the menu structure and most often used menus and
screens. They are located directly underneath the display and as the keys'
functions change this is indicated by user-defined labels in the lower part of
the display, so that the user knows what the keys are to be used for.

To change a soft key, place the menu cursor “>” on the item of the selected
menu or screen you wish to set. Press followed by the selected soft key
within 1 second of pressing the right-arrow key. The edit soft key prompt
will be displayed for configuration for the new label.

Note Not all menu items may be assigned to soft keys. If a particular menu
or screen item cannot be assigned, the key assignment screen will not come
up upon entering right-arrow-soft key combinations. All items under the
Service menu (including the menu itself) cannot be assigned soft keys. 

EDIT SOFT KEY PROMPT:
CURRENTLY: RANGE

RANGE

ABCDEFGHIJKLMN BKSP

OPQRSTUVWXYZ PAGE
0123456789 ./- SAVE

RANGE AVG DIAGS ALARM

Software Overview The Model 42i Low Source utilizes the menu-driven software illustrated by

the flowchart in Figure 3-3. The Power-Up screen, shown at the top of the
flowchart, is displayed each time the instrument is turned on. This screen is
displayed while the instrument is warming up and performing self-checks.
After the warm-up period, the Run screen is automatically displayed. The
Run screen is the normal operating screen. It displays the NO, NO
NO

concentrations, depending on operating mode. From the Run screen,

x

the Main Menu can be displayed by pressing . The Main Menu
contains a list of submenus. Each submenu contains related instrument
parameters and/or functions. This chapter describes each submenu and
screen in detail. Refer to the appropriate sections for more information.

, and

2

3-4 Model 42i Low Source Instruction Manual Thermo Electron Corporation

2CUUYQTF

5GV2CUUYQTF

%JCPIG2CUUYQTF

7PNQEM+PUVTWOGPV

.QEM+PUVTWOGPV

4GOQXG2CUUYQTF

5GTXKEG

6GOR%CN

#PCNQI1WVRWV%CN

%QPX5GV6GOR

2/68QNVCIG#FL

4CPIG/QFG5GNGEV

2TGUUWTG%CN

#PCNQI+PRWV%CN

+PRWV$F%CN

1\QPCVQT5CHGV[

'ZVGPFGF4CPIGU

&KNWVKQP4CVKQ

&KURNC[2KZGN6GUV

4GUVQTG7UGT&GHCWNVU

#NCTOU

#NCTOU&GVGEVGF

%JCODGT6GOR

%QQNGT6GOR

+PVGTPCN6GOR

&KCIPQUVKEU

5ETGGP

5ETGGP

5GNH6GUV

2QYGTÄWR

4WP5ETGGP

/CKP/GPW

+PUVTWOGPV

%CNKDTCVKQP

6GORU

8QNVCIGU

2TQITCO8GTUKQP

2TGUUWTG

%QPVTQNU

#WVQ/CP/QFG

1\QPCVQT

2/65WRRN[

&CVCNQIIKPI5GVVKPIU



:

%CN01$MI

%CN01$MI

%CN01%QGH

%CN01%QGH

%QPX6GOR

(NQY

%QOO5GVVKPIU

:

%CN01%QGH

#PCNQI+PRWV4GCFKPIU

+1%QPHKI

%CN2TGUUWTG

2TGUUWTG

1\QPCVQT(NQY

#PCNQI+PRWV8QNVCIGU

&KIKVCN+PRWVU

6GOR%QORGPUCVKQP

2TGU%QORGPUCVKQP

<GTQ5RCP%JGEM

<GTQ%JGEM

4GNC[5VCVGU

5ETGGP%QPVTCUV

%CN01$MI

5RCP%JGEM

6GUV#PCNQI1WVRWVU

5GTXKEG/QFG

%CN01$MI

<GTQ#WVQECN

:

:



5RCP#WVQECN

01%QPE

01%QPE

01%QPE

/$5VCVWU

+PV$F5VCVWU

+1'ZR$F5VCVWU

%QPVCEV+PHQ

+PUVTWOGPV%QPHKI

&CVG6KOG



:

:



%CN*K01%QGH

%CN*K01%QGH

%CN*K01%QGH

%CN.Q01%QGH

%CN.Q01%QGH

%CN.Q01%QGH

%CN2TGUUWTG

(CEVQTU

%CNKDTCVKQP



:

:

01%QGH

%CN2TGUUWTG

01%QGH

01%QGH

4GUGV7UGT%CN&GHCWNVU

01$MI

01$MI



:

01$MI

01$MI

*K01%QGH

*K01%QGH

*K01%QGH

%CN2TGUUWTG

.Q01%QGH

.Q01%QGH

.Q01%QGH

4GUGV7UGT%CN&GHCWNVU

Figure 3-3. Flowchart of Menu-Driven Software

:



:

6KOG

#XGTCIKPI

#XI6KOG

4CPIG



)CU7PKVU

014CPIG

014CPIG

*K#XI6KOG

.Q#XI6KOG

(QT&WCNQT#WVQ4CPIG1PN[

:



:

:

5GV%WUVQO4CPIGU

014CPIG



)CU7PKVU

*K014CPIG

*K014CPIG

.Q014CPIG

.Q014CPIG

5GV%WUVQO4CPIGU

*K014CPIG

.Q014CPIG

Thermo Electron Corporation Model 42i Low Source Instruction Manual 3-5

Operation

Software Overview

Power-Up Screen The Power-Up screen is displayed on power up of the Model 42i Low

Source. The Self-Test is displayed while the internal components are
warming up and diagnostic checks are performed.

Please wait while booting...

Run Screen The Run screen displays the NO, NO

status bar displays time and the status of the remote control interface, and
optional zero/span solenoid valves, if installed. The word “SAMPLE” on the
bottom left of the display indicates the analyzer has the span/zero valve
option and is in “SAMPLE” mode. Other modes appear in the same area of
the display as “ZERO” or “SPAN”. For more information about the
optional solenoid valves, see Chapter 9, “Optional Equipment”.

When operating in dual or auto range mode, two sets of coefficients are used
to calculate the NO-NO2-NOx “LOW” and “HIGH” concentrations. Also,
two averaging times are used—one for each range. The title bar indicates
which range concentrations are displayed. The words “LOW RANGE
CONCENTRATION” on the top of the display indicates that the low
concentration is displayed. In dual range mode, pressing the

arrows will toggle between high and low concentrations. The

example below shows the Run screen in single range mode.

, and NOx concentrations. The

2

and

3-6 Model 42i Low Source Instruction Manual Thermo Electron Corporation

Operation

X CONCENTRATION W

NO 62.7 PPB

NO2 25.5 PPB

NOx 88.2 PPB

SAMPLE 12:34 ALARMx

RANGE AVG DIAGS ALARM

Software Overview

Main Menu The Main Menu contains a number of submenus. Instrument parameters

and features are divided into these submenus according to their function.
The concentration appears above the main menu and submenus in every
screen, as shown below. The Service menu is visible only when the
instrument is in service mode. For more information on the service mode,
see “Service Mode” later in this chapter.

• Use and to move the cursor up and down.

• Press to select a choice.

• Press to return to the Main Menu or to return to the Run
screen.

XXLO WCONCENTRATIONXXLO W

NO 62.7 PPB
NO2 25.5 PPB
NOx 88.2 PPB
SAMPLE 12:34 ALARMx
MAIN MENU:
>RANGE
AVERAGING TIME
CALIBRATION FACTORS
CALIBRATION
INSTRUMENT CONTROLS
DIAGNOSTICS
ALARMS

RANGE AVG DIAGS ALARM

ª

Thermo Electron Corporation Model 42i Low Source Instruction Manual 3-7

SERVICE
PASSWORD

Operation

Range Menu

Range Menu The Range menu allows the operator to select the gas units, NO-NO

ranges, and to set the custom ranges. The screens below show the range
menu in single range mode and dual/auto range modes. For more
information about the single, dual, and auto range modes, see “Single Range
Mode”, “Dual Range Mode”, and “Auto Range Mode” below.

• In the Main Menu, choose Range.

RANGE: RANGE:
>GAS UNITS PPB >GAS UNITS PPB
NO RANGE 200 HI NO RANGE 1000
NO2 RANGE 200 LO NO RANGE 200
NOx RANGE 200 HI NO2 RANGE 1000
SET CUSTOM RANGES LO NO2 RANGE 200

HI NOx RANGE 1000
LO NOx RANGE 200

RANGE AVG DIAGS ALARM

RANGE AVG DIAGS ALARM

SET CUSTOM RANGES

-NOx

2

ª

Single Range Mode In the single range mode, the NO, NO

range, one averaging time, and one span coefficient.

By default, the three analog outputs are arranged on the rear panel
connector as shown in Figure 3-4. See Table 3-2 for channels and pin
connections. Single range mode may be selected from the
“Single/Dual/Auto Select” in the “Service Menu”, later in this chapter.

, and NOx channels each have one

2

3-8 Model 42i Low Source Instruction Manual Thermo Electron Corporation

Operation

Range Menu

Figure 3-4. Pin-Out of Rear Panel Connector in Single Range Mode

Table 3-2. Default Analog Outputs in Single Range Mode

Channel Pin Description

1 14 NO Analog Output

233 NO

315 NO

4 34 None

5 17 None

6 36 None

Ground 16, 18, 19, 35, 37 Signal Ground

Analog Output

2

Analog Output

x

Note All channels are user definable. If any customization has been made to
the analog output configuration, the default selections may not apply.



Thermo Electron Corporation Model 42i Low Source Instruction Manual 3-9

Operation

Range Menu

Dual Range Mode In the dual range mode, there are two independent channels defined for

each compound being measured. These are labeled simply as the “High
Range” and the “Low Range”. Each channel has its own analog output
range, averaging time and span coefficient.

This enables the sample concentration readings to be sent to the analog
outputs using two different ranges. For example, the low NO analog output
can be set to output concentrations from 0 to 200 ppb and the high NO
analog output set to output concentrations from 0 to 500 ppb.

In addition to each channel having two ranges, each channel has two span
coefficients. There are two span coefficients so that each range can be
calibrated separately. This is necessary if the two ranges are not close to one
another. For example, if the low NO range is set to 0–200 ppb and the high
NO range is set to 0–20,000 ppb.

By default, in the dual range mode, the analog outputs are arranged on the
rear panel connector as shown in Figure 3-5. See Table 3-3 for channels and
pin connections. Dual range mode may be selected from the
“Single/Dual/Auto Select” in the “Service Menu”, later in this chapter.

Figure 3-5. Pin-Out of Rear Panel Connector in Dual Range Mode

3-10 Model 42i Low Source Instruction Manual Thermo Electron Corporation

Table 3-3. Default Analog Outputs in Dual Range Mode

Channel Pin Description

1 14 NO High Range

Operation

Range Menu

233 NO

315 NO

4 34 NO Low Range

517 NO

636 NO

Ground 16, 18, 19, 35, 37 Signal Ground

High Range

2

High Range

x

Low Range

2

Low Range

x

Note All channels are user definable. If any customization has been made to
the analog output configuration, the default selections may not apply. 

Auto Range Mode The auto range mode switches the NO, NO

between high and low ranges, depending on the NOx concentration level,
except when continuous NO mode is active. The high and low ranges are
defined in the Range menu.

For example, suppose the low ranges are set to 200 ppb and the high ranges
are set to 1000 ppb (Figure 3-6). Sample concentrations below 200 ppb are
presented to the low ranges analog outputs and sample concentrations
above 200 ppb are presented to the high ranges analog outputs. When the
low ranges are active, the status output is at 0 volts. When the high ranges
are active, the status output is at half of full-scale.

and NOx analog outputs

2

When the high ranges are active, the NOx concentration must drop to 95%
of the low NO

range for the low ranges to become active.

x

In addition to each channel having two ranges, each channel has two span
coefficients. There are two span coefficients so that each range can be
calibrated separately. This is necessary if the two ranges are not close to one
another. For example, if the low NO range is set to 0–200 ppb and the high
NO range is set to 0–20,000 ppb.

Thermo Electron Corporation Model 42i Low Source Instruction Manual 3-11

Operation

Range Menu

Figure 3-6. Analog Output in Auto Range Mode

By default, in the auto range mode, the analog outputs are arranged on the
rear panel connector as shown in Figure 3-7. See Table 3-4 for channels and
pin connections. Auto range mode may be selected from the
“Single/Dual/Auto Select” in the “Service Menu”, later in this chapter.

3-12 Model 42i Low Source Instruction Manual Thermo Electron Corporation

Operation

Range Menu

Figure 3-7. Pin-Out of Rear Panel Connector in Auto Range Mode

Table 3-4. Default Analog Outputs in Auto Range Mode

Channel Pin Description

1 14 NO Analog Output

233 NO

315 NO

4 34 Range Status:

5 17 None

6 36 None

Ground 16, 18, 19, 35, 37 Signal Ground

Analog Output

2

Analog Output

x

half scale = high range

zero scale = low range

Note All channels are user definable. If any customization has been made to
the analog output configuration, the default selections may not apply.



Thermo Electron Corporation Model 42i Low Source Instruction Manual 3-13

Operation

Range Menu

Gas Units The Gas Units screen defines how the NO, NO

readings are expressed. Gas units of parts per billion (ppb), parts per million
(ppm), micrograms per cubic meter (µg/m3), or milligrams per cubic meter
(mg/m3) are available. The µg/m3 and mg/m3 gas concentration modes are
calculated using a standard pressure of 760 mmHg and a standard
temperature of 20 °C.

When switching the selected units from ppb or ppm to µg/m3 or mg/m3,
the analog ranges all default to the highest range in that mode. For example,
when switching from mg/m3 to ppm, all the ranges default to 100 ppm.
Therefore, whenever you change units, you should also check the range
settings.

• In the Main Menu, choose Range > Gas Units.

•Use and to scroll through a list of choices.

• Press to save the new units.

Note If the units change from ppb/ppm to µg/m3/mg/m3 or vice-versa, the
instrument should be recalculated, particularly if the user’s standard
temperature is different from 20 °C. A display warning will appear that
ranges will be defaulted and calibration parameters reset. 

, and NOx concentration

2

GAS UNITS:
CURRENTLY: PPB
SET TO: UG/M3 ?
AND SET RANGES AND CAL TOX
DEFAULT SETTINGSXXXXXXXXXX

©ª CHANGE VALUE  SAVE

RANGE AVG DIAGS ALARM

NO, NO2, and NOx Ranges The NO, NO

, and NOx Ranges define the concentration range of the

2

analog outputs. For example, an NO2 range of 0–200 ppb restricts the NO2
analog output to concentrations between 0 and 200 ppb.

The display shows the current NO, NO

, or NOx range. The next line of

2

the display is used to change the range. The range screen is similar for the
single, dual, and auto range modes. The only difference between the screens
are the words “High” and “Low” to indicate which range is displayed. The
example below shows the NO range screen in single mode. For more

3-14 Model 42i Low Source Instruction Manual Thermo Electron Corporation

Operation

Range Menu

information about the single, dual, and auto range modes, see “Single
Range Mode”, “Dual Range Mode”, and “Auto Range Mode” earlier in this
chapter.

Table 3-5 lists the standard ranges. Table 3-6 lists the extended ranges.
When switching from standard to extended ranges, the PMT voltage must
be readjusted. For more information about readjusting the PMT voltage,
see Chapter 7, “Servicing”.

• In the Main Menu, choose Range > NO, NO2, or NOx Range.

•Use and to scroll through a list of choices.

• Press to save the new range.

NO RANGE:
CURRENTLY: 200.0
SET TO: 500.0 ?

©ª

CHANGE VALUE



SAVE VALUE

RANGE AVG DIAGS ALARM

Table 3-5. Standard Ranges

ppb ppm µg/m

200 0.2 500 0.5

500 0.5 1,000 1.0

1,000 1.0 2,000 2.0

2,000 2.0 5,000 5.0

5,000 5.0 10,000 10.0

10,000 10.0 20,000 20.0

20,000 20.0 50,000 50.0

50,000 50.0 100,000 100.0

100,000 100.0 150,000 150.0

C1 C1 C1 C1

C2 C2 C2 C2

3

mg/m

3

C3 C3 C3 C3

Thermo Electron Corporation Model 42i Low Source Instruction Manual 3-15

Operation

Range Menu

Table 3-6. Extended Ranges

ppb ppm µg/m

1,000 1.0 2,000 2.0

2,000 2.0 5,000 5.0

5,000 5.0 10,000 10.0

10,000 10.0 20,000 20.0

20,000 20.0 50,000 50.0

50,000 50.0 100,000 100

100,000 100 200,000 200

200,000 200 500,000 500

500,000 500 750,000 750

C1 C1 C1 C1

C2 C2 C2 C2

C3 C3 C3 C3

3

mg/m

3

C1, C2, and C3 are custom ranges. For more information about custom
ranges, see “Set Custom Ranges” below.

Set Custom Ranges The Set Custom Ranges menu lists three custom ranges: C1, C2, and C3.

Custom ranges are user-defined ranges. In the standard range mode, any
value between 200 ppb (0.2 ppm) and 100,000 ppb (100 ppm) can be
specified as a range. In the µg/m3(mg/m3) mode, any value between 500
µg/m3 (0.5 mg/m3) and 150,000 µg/m3 (150 mg/m3) can be specified as a
range. In the extended range mode, any value between 1,000 ppb (1.0 ppm)
and 500,000 ppb (500 ppm) can be specified as a range. In the

3

µg/m
750,000 µg/m

• In the Main Menu, choose Range > Set Custom Ranges.

(mg/m3) mode, any value between 2,000 µg/m3 (2.0 mg/m3) and

3

(750 mg/m3) can be specified as a range.

CUSTOM RANGES:
>CUSTOM RANGE 1 255.6
CUSTOM RANGE 2 275.0
CUSTOM RANGE 3 1125.0

RANGE AVG DIAGS ALARM

3-16 Model 42i Low Source Instruction Manual Thermo Electron Corporation

Custom Ranges The Custom Ranges screen is used to define the custom ranges.

The display shows the current custom range. The next line of the display is
used to set the range. To use the custom full-scale range, be sure to select it
(Custom range 1, 2, or 3) in the NO, NO2, or NOx Range screen. For
more information about selecting ranges, see “NO, NO

, and NOx Ranges”

2

above.

• In the Main Menu, choose Range > Set Custom Ranges > Custom
range 1, 2, or 3.

• Use and to increment or decrement the numeric value.

• Press to save the new range.

CUSTOM RANGE 1:
CURRENTLY: 255.6
SET TO: 000255.7 ?

Operation

Averaging Time

§¨

MOVE CURSOR

©ª

CHANGE VALUE

RANGE AVG DIAGS ALARM



SAVE

Averaging Time The averaging time defines a time period (10 to 300 seconds) over which

NO, NO2, and NOx measurements are averaged. The average
concentration of the NO, NO2, and NOx readings are calculated for that
time period. The front panel display and analog outputs are updated every
10 seconds with the calculated averages. An averaging time of 10 seconds,
for example, means that the average concentration of the last 10 seconds
will be output at each update. An averaging time of 300 seconds means that
the moving average concentration of the last 300 seconds will be output at
each 10-second update. Therefore, the lower the averaging time, the faster
the front panel display and analog outputs respond to concentration
changes. Longer averaging times are typically used to smooth output data.

The Averaging Time screen for the single range mode is shown below. In the
dual and auto range modes, an averaging time menu is displayed before the
averaging time screen. This additional menu is needed because dual and
auto range modes have two averaging times (high and low). The averaging
time screens function the same way in the single, dual and auto range
modes. The following averaging times are available: 10, 20, 30, 60, 90, 120,
180, 240, and 300 seconds. Additional averaging times are available in

Thermo Electron Corporation Model 42i Low Source Instruction Manual 3-17

Operation

Calibration Factors Menu

manual NO and manual NOx modes: 1, 2, and 5 seconds. For more
information about the manual mode, see “Auto/Manual Mode” later in this
chapter.

• In the Main Menu, choose Averaging Time.

• Use and to scroll through a list of choices.

• Press to save the averaging time.

AVERAGING TIME:
CURRENTLY: 30 SEC
SET TO: 10 SEC ?

RANGE AVG DIAGS ALARM

©ª

CHANGE VALUE



SAVE VALUE

Calibration Factors

Menu

Calibration factors are used to correct the NO, NO2, and NOx
concentration readings that the instrument generates using its own internal
calibration data. The Calibration Factors menu displays the calibration
factors. The screens below show the calibration factors menu in single mode
and dual/auto range modes.

Normally, the instrument is calibrated automatically using the commands
listed in the Calibration menu described later in this chapter. However, the
instrument can also be calibrated manually using the Calibration Factors
menu.

To manually calibrate the instrument, see “NO and NO

Backgrounds”,

x

“NO, NO2, and NOx Span Coefficients”, and “Calibration Pressure” below.

• In the Main Menu, choose Calibration Factors.

3-18 Model 42i Low Source Instruction Manual Thermo Electron Corporation

Operation

Calibration Factors Menu

CALIBRATION FACTORS: CALIBRATION FACTORS:
>NO BKG 0.0 >NO BKG 0.0
NOx BKG 0.0 NOx BKG 0.0
NO COEF 1.000 HI NO COEF 1.000
NO2 COEF 1.000 HI NO2COEF 1.000
NOx COEF 1.000 HI NOx COEF 1.000
CAL PRESSURE 150.0 mmHg LO NO COEF 1.000
RESET USER CAL DEFAULTS

LO NO2 COEF 1.000

ª

RANGE AVG DIAGS ALARM

NO and NOx Backgrounds The NO and NO

calibration. The NO background is the amount of signal read by the
analyzer in the NO channel while sampling zero air. The NOx background
is the amount of signal read by the analyzer in the NOx channel while
sampling zero air. Although the background is expressed in terms of
concentration, the background signal is actually the combination of
electrical offsets, PMT dark current, and trace substances undergoing
chemiluminescence. Before the analyzer sets the NO and NOx readings to
zero, it stores these values as the NO and NOx background corrections,
respectively. The NO2 background correction is determined from the NO
and NOx background corrections and is not displayed. NO and NOx
background corrections are typically below 15 ppb.

The NO and NO
adjustment of the instruments zero background. Before performing a
background adjustment, allow the analyzer to sample zero air until stable
readings are obtained. The NO channel should be adjusted first. Both the
NO and NOx Background screens operate the same way. Therefore, the
following description of the NO background screen applies to the NOx
background screen as well. The first line of the display shows the current
NO reading. The second line of the display shows the NO background
correction that is stored in memory. The NO background correction is a
value, expressed in the current gas units, that is subtracted from the NO
reading to produce the NO reading that is displayed.

RANGE AVG DIAGS ALARM

LO NOx COEF 1.000
CAL PRESSURE 150.0 mmHg
RESET USER CAL DEFAULTS

background corrections are determined during zero

x

Background screens are used to perform a manual

x

Thermo Electron Corporation Model 42i Low Source Instruction Manual 3-19

Operation

Calibration Factors Menu

In the example below, the analyzer is displaying 4.4 ppb of NO while
sampling zero air. A background correction of 0.0 ppb means that 0 ppb is
being subtracted from the NO concentration being displayed. Therefore,
the background correction must be increased to 4.4 ppb in order for the
NO reading to be at 0 ppb, i.e., a NO reading of 4.4 ppb minus a NO
background reading of 4.4 ppb gives the corrected NO reading of 0 ppb.

To set the NO reading in the example below to zero, use to
increment the NO background correction to 4.4 ppb. As the NO
background correction is increased, the NO concentration is decreased.
Note that at this point, pressing and however, has no affect on
the analog outputs or the stored NO background correction of 0.0 ppb. A
question mark following both the NO reading and the NO background
correction indicates that these are proposed changes as opposed to
implemented changes. To escape this screen without saving any changes,
press to return to the Calibration Factors menu or to return
to the Run screen. Press to actually set the NO reading to 0 ppb and
store the new background correction of 4.4 ppb. Then the question mark
prompt beside the NO reading disappears.

• In the Main Menu, choose Calibration Factors > NO or NOx
Background.

•Use and to increment or decrement the proposed
background value.

• Press to save the new background.

NO BACKGROUND:
NO: 4.4
SET BKG TO: 0.0

©ª

INC/DEC



SAVE VALUE

RANGE AVG DIAGS ALARM

3-20 Model 42i Low Source Instruction Manual Thermo Electron Corporation

Operation

Calibration Factors Menu

NO, NO2, and NO

Coefficients

The NO, NO2, and NOx span coefficients are usually calculated by the

x

instrument processor during calibration. The span coefficients are used to
correct the NO, NO2, and NOx readings. The NO and NOx span
coefficients normally have values near 1.000. The NO2 span coefficient
normally has a value between 0.95 and 1.050.

The NO, NO2, and NOx Coefficient screens allow the NO, NO2, and
NOx span coefficients to be manually changed while sampling span gas of
known concentration. The NO, NO2, and NOx coefficient screens operate
the same way. Therefore, the following description of the NO coefficient
screen applies to the NO2 and NOx coefficient screens as well.

The display shows the current NO concentration reading. The next line of
the display shows the NO span coefficient that is stored in memory and is
being used to correct the NO concentration. Notice that as the span
coefficient value is changed, the current NO concentration reading on the
above line also changes. However, no real changes are made to the value
stored in memory until is pressed. Only proposed changes, as
indicated by a question mark prompt, are displayed until is pressed.

In dual or auto range mode, “High” or “Low” is displayed to indicate the
calibration of the high or low coefficient. The example below shows the
coefficient screen in single mode.

Note The concentration value will show ERROR if the measured
concentration is not a valid span value (either higher than the selected
range, or 0 or lower). 

• In the Main Menu, choose Calibration Factors > NO, NO2 or NOx
Coef.

• Use and to increment or decrement the coefficient value.

• Press to save the new coefficient.

NO COEFFICIENT:
NO: 51.4
SET COEF TO: 1.000 ?

©ª

INC/DEC



SAVE VALUE

RANGE AVG DIAGS ALARM

Thermo Electron Corporation Model 42i Low Source Instruction Manual 3-21

Operation

Calibration Factors Menu

Calibration Pressure The Calibration Pressure screen reports the reactor pressure at which current

calibration was performed. The screen also allows this value to be edited by
the operator. This value should not be changed unless a complete manual
calibration is being performed. The calibration pressure is set equal to the
reactor pressure at the time of calibration.

Note Turning the pressure compensation on and off can produce significant
artificial jumps in the apparent sample concentration. If the pressure
compensation feature is to be used, the instrument must be calibrated with
the pressure compensation feature on. For more information about
calibration, see Chapter 4, “Calibration”. 

• In the Main Menu, choose Calibration Factors > Calibration Pressure.

• Use and to increment or decrement the calibration
pressure value.

• Press to save the new calibration pressure.

CALIBRATION PRESSURE:
PRESSURE: 151.6
SET CAL PRES TO: 150.0

©ª

INC/DEC



SAVE VALUE

RANGE AVG DIAGS ALARM

Reset User Calibration Default The Reset User Calibration Default screen allows the user to reset the

calibration configuration values to factory defaults.

• In the Main Menu, choose Service > Calibration Factors > Reset User
Cal Defaults.

• Press to warn user and enable restore with .

• Use to reset the calibration pressure reference value when pressed
after .

3-22 Model 42i Low Source Instruction Manual Thermo Electron Corporation

RESTORE DEFAULT CAL: RESTORE DEFAULT CAL:

 RESTORE  RESTORE

ARE YOU SURE YOU WANT TO?x
PRESS ¨ TO CONFIRM RESTORE

Operation

Calibration Menu

RANGE AVG DIAGS ALARM

RANGE AVG DIAGS ALARM

Calibration Menu The Calibration menu is used to calibrate the analyzer, including zero

backgrounds, the NO, NO2, and NOx coefficients, and the calibration
pressure. The screens below show the calibration menu in single mode and
dual/auto range modes.

The calibration procedure is the same in dual, auto, or single range,
however, there are two sets of gas coefficients in dual or auto range (i.e. low
and high coefficients). This enables each range to be calibrated separately.
When calibrating the instrument in dual or auto range, be sure to use a low
span gas to calibrate the low range and a high span gas to calibrate the high
range.

Whether dual or single range, the first step in calibrating the instrument is
to assign the calibration pressure. The calibration pressure is used to
account for slight pressure fluctuation brought on by changing weather. The
calibration pressure is set equal to the reactor pressure at the time of
calibration. For more information about calibration, see Chapter 4,
“Calibration”.

• In the Main Menu, choose Calibration.

Thermo Electron Corporation Model 42i Low Source Instruction Manual 3-23

Operation

Calibration Menu

CALIBRATION: CALIBRATION:
>CAL NO BACKGROUND >CAL NO BACKGROUND
CAL NOx BACKGROUND CAL NOx BACKGROUND
CAL NO COEFFICIENT CAL HI NO COEFFICIENT
CAL NO2 COEFFICIENT CAL HI NO2 COEFFICIENT
CAL NOx COEFFICIENT CAL HI NOx COEFFICIENT
CALIBRATE PRESSURE CAL LO NO COEFFICIENT
ZERO/SPAN CHECK

CAL LO NO2 COEFFICIENT

ª

RANGE AVG DIAGS ALARM

Calibrate NO and NO

Background

The Calibrate NO and NOx Background screens are used to adjust the

x

background, or perform a “zero calibration”. Be sure the analyzer samples
zero air until the readings stabilize. The display shows the current NO or
NOx reading.

It is important to note the averaging time when calibrating. The longer the
averaging time, the more precise the calibration will be. For the most precise
calibration, use the 300-second averaging time. For more information about
calibration, see Chapter 4, “Calibration”.

• In the Main Menu, choose Calibration > Calibrate NO or NOx

•Press to set the new reading to zero.

RANGE AVG DIAGS ALARM

CAL LO NOx COEFFICIENT
CALIBRATE PRESSURE

Background.

NO BACKGROUND:
NO: 1.2
CURRENTLY: 0.0 ?



SET NO TO ZERO

RANGE AVG DIAGS ALARM

3-24 Model 42i Low Source Instruction Manual Thermo Electron Corporation

Operation

Calibration Menu

Calibrate NO, NO2, and

NOx Coefficients

The Calibrate NO Coefficient screen is used to adjust the NO span
concentrations while sampling span gas of known concentration. All
calibration screens operate the same way. Therefore, the following
description of the NO calibration screen applies to the NO2 and NOx
calibration screens as well.

The display shows the current NO concentration reading and the current
NO range. The next line of the display is where the NO calibration gas
concentration is entered.

It is important to note the averaging time when calibrating. The longer the
averaging time, the more precise the calibration will be. For the most precise
calibration, use the 300-second averaging time. For more information about
calibration, see Chapter 4, “Calibration”.

• In the Main Menu, choose Calibration > Cal NO, NO2, or NOx
Coefficents.

• Use and pushbuttons to move the cursor left or right.

• Use and to increment or decrement the numeric value.

•Press to calculate and save the new coefficient based on the
entered span concentration.

CALIBRATE NO:
NO: 79.1
SPAN CONC: 00000801 ?

§¨

MOVE CURSOR

©ª

CHANGE VALUE

RANGE AVG DIAGS ALARM



SAVE

Thermo Electron Corporation Model 42i Low Source Instruction Manual 3-25

Operation

Calibration Menu

Calibrate Pressure The Calibrate Pressure screen is used to set the calibration pressure.

The calibration pressure should be set only when calibrating the instrument.

• In the Main Menu, choose Calibration > Calibrate Pressure.

•Press to save the current chamber as the new calibration pressure.

CALIBRATE PRESSURE:
CUR CAL PRES: 150.0 mmHg
CURRENT PRES: 151.6 mmHg ?



SAVE CURRENT PRESSURE

AS CAL PRESSURE

RANGE AVG DIAGS ALARM

Zero/Span Check The Zero/Span Check menu is available with the zero/span valve option. It

is used to program the instrument to perform fully automated zero and span
check or adjustments. Total Duration Hour is the sum of zero, span, and
purge duration minutes. Zero and Span Calibration Reset are toggle items
that change between yes or no when selected, and displayed if auto
calibration is installed.

• In the Main Menu, choose Calibration > Zero/Span Check.

ZERO/SPAN CHECK:
>NEXT TIME 01Jan05 12:00
PERIOD HR 24
TOTAL DURATION HR 1.5
ZERO DURATION MIN 30
SPAN DURATION MIN 30
PURGE DURATION MIN 30
ZERO/SPAN AVG SEC 60

RANGE AVG DIAGS ALARM

ZERO CAL RESET
SPAN CAL RESET OFF
ZERO/SPAN RATIO 1

ª

3-26 Model 42i Low Source Instruction Manual Thermo Electron Corporation

Next Time The Next Time screen is used to view and set the next zero/span check date

and time. Once the initial zero/span check is performed, the date and time
of the next zero/span check is calculated and displayed.

• In the Main Menu, choose Calibration > Zero/Span Check > Next
Date/Time.

• Use , , and to move and change the value of
the date and time.

•Press to accept a change.

NEXT DATE AND TIME: NEXT DATE AND TIME:
01 JAN 2005 12:00 02 JAN 2005 12:00 ?
PRESS

 TO EDIT

SETTING: DAYS

¨ SET MONTHS

©ª CHANGE VALUE

 SAVE VALUE

Operation

Calibration Menu

RANGE AVG DIAGS ALARM

Period Hours The Zero/Span Period Hours screen defines the period or interval between

zero/span checks. Periods between 0 and 999 hours are acceptable. To turn
the zero/span check off, set the period to 0.

• In the Main Menu, choose Calibration > Zero/Span Check > Period
Hours.

• Use and to increment and decrement the numeric value.

•Press to save the period.

ZERO/SPAN PERIOD:
CURRENTLY: 024 HRS
SET TO: 025 HRS ?

©ª

CHANGE VALUE

RANGE AVG DIAGS ALARM

§¨

MOVE CURSOR



SAVE

RANGE AVG DIAGS ALARM

Thermo Electron Corporation Model 42i Low Source Instruction Manual 3-27

Operation

Calibration Menu

Zero/Span/Purge Duration

Minutes

The Zero Duration Minutes screen defines how long zero air is sampled by
the instrument. The span and purge duration screens look and function the
same way as the zero duration screen, and are used to set how long the span
gas and sample gas are sampled by the instrument. Durations between 0 and
60 minutes are acceptable. Each time a zero/span check occurs the zero
check is done first, followed by the span check. To perform just a zero check,
set the span and purge duration screen to 0 (off). The same applies to
perform just a span or purge check.

• In the Main Menu, choose Calibration > Zero/Span Check > Zero,
Span or Purge Duration Min.

• Use and to increment and decrement the numeric value.

•Press to save the duration value.

ZERO DURATION:
CURRENTLY: 30 MIN
SET TO: 31 MIN ?

§¨

MOVE CURSOR

©ª

CHANGE VALUE

RANGE AVG DIAGS ALARM



SAVE

Zero/Span Averaging Time The Zero/Span Averaging Time screen allows the user to adjust the

zero/span averaging time. The zero/span averaging time is used by the
analyzer only when performing an automatic zero or span check. The
analyzer’s averaging time is used for all other functions. The following
averaging times are available: 1, 2, 5, 10, 20, 30, 60, 90, 120, 180, 240, and
300 seconds.

• In the Main Menu, choose Calibration > Zero/Span Check > Zero/Span
Avg Sec.

• Use and to scroll through a list of choices.

• Press to save the averaging time.

3-28 Model 42i Low Source Instruction Manual Thermo Electron Corporation

Operation

Calibration Menu

ZERO/SPAN AVERAGING TIME:
CURRENTLY: 60 SEC
SET TO: 90 SEC ?

©ª

CHANGE VALUE



SAVE VALUE

RANGE AVG DIAGS ALARM

Zero/Span Ratio The Zero/Span Ratio screen is used to adjust the ratio of zeros to spans. For

example, if this value is set to 1, a span check will follow every zero check. If
this value is set to 3, there will be two zero checks between each zero/span
check. This value may be set from 1 to 10, with 1 as default.

• In the Main Menu, choose Calibration > Zero/Span Check >
Zero/Span Ratio.

• Use and to increment and decrement the numeric value.

•Press to save the ratio value.

ZERO/SPAN RATIO:
CURRENTLY: 1 :1
SET TO: 2 :1 ?

©ª

CHANGE VALUE



SAVE VALUE

RANGE AVG DIAGS ALARM

Thermo Electron Corporation Model 42i Low Source Instruction Manual 3-29

Operation

Instrument Controls Menu

Instrument Controls

Menu

The Instrument Controls menu contains a number of items. The software
controls listed in this menu enable control of the listed instrument
functions.

• In the Main Menu, choose Instrument Controls.

INSTRUMENT CONTROLS:
>OZONATOR
PMT SUPPLY
AUTO/MANUAL MODE
DATALOGGING SETTINGS
COMMUNICATION SETTINGS
I/O CONFIGURATION
TEMPERATURE COMPENSATION

RANGE AVG DIAGS ALARM

PRESSURE COMPENSATION
SCREEN CONTRAST
SERVICE MODE
DATE/TIME

ª

Ozonator The Ozonator screen is used to turn the internal ozonator on or off. The

display shows the status of the control line that turns the ozonator on or off.
The next line of the display shows the user-specified ozonator setting. Under
most conditions, the control line status and ozonator set status are the same.
However, as a safety precaution, the microprocessor can override the
user-specified ozonator setting. This occurs only if the ozonator flow doesn’t
indicate any flow or if the NO2 converter temperature is below the
minimum alarm limit. In this case, an alarm is activated and the ozonator is
turned off. This is done to prevent the ozonator from overheating, which
will result in permanent damage to the ozonator, or if the converter
temperature drops below the minimum limit, which reduces the
effectiveness of the ozone destruct.

It is possible, however, to defeat this feature, by setting the ozonator safety
“OFF” in the “Service Menu”.

Note The ozonator must be “ON” to obtain NO, NO
As an additional safety precaution, a lit LED mounted on the measurement
interface board indicates that the ozonator is on.

• In the Main Menu, choose Instrument Controls > Ozonator.

, and NOx readings.

2



•Press to toggle and set the ozonator on or off.

3-30 Model 42i Low Source Instruction Manual Thermo Electron Corporation

Operation

Instrument Controls Menu

OZONATOR:
CURRENTLY: OFF
SET TO: ON ?

RANGE AVG DIAGS ALARM

 TOGGLE VALUE

PMT Supply The PMT Supply screen is used to turn the PMT power supply on or off.

This is useful in a troubleshooting situation.

• In the Main Menu, choose Instrument Controls > PMT Supply.

•Press to toggle and set the PMT supply on or off.

PMT SUPPLY:
CURRENTLY: OFF
SET TO: ON ?

RANGE AVG DIAGS ALARM

 TOGGLE VALUE

Auto/Manual Mode The Auto/Manual Mode screen allows selection of the automatic mode

(NO/NOx), NO mode (manual NO), or NOx mode (manual NOx). The
auto mode switches the mode solenoid valve automatically on a 10 second
cycle so that NO, NO2, and NOx concentrations are determined. The
manual NO mode puts the mode solenoid valve into the open position so
that the sample gas bypasses the NO2-to-NO converter. Therefore, only the
NO concentration is determined. The manual NOx mode puts the mode
solenoid valve into the closed position so that the sample gas passes through
the NO2-to-NO converter. Therefore, only the NOx concentration is
determined. In the manual modes, additional averaging times of 1, 2, and 5
seconds are available from the Averaging Time screen.

• In the Main Menu, choose Instrument Controls > Auto/Manual Mode.

• Use and to scroll through a list of choices.

Thermo Electron Corporation Model 42i Low Source Instruction Manual 3-31

Operation

Instrument Controls Menu

Datalogging Settings The Datalogging Settings menu deals with datalogging.

•Press to save the new mode state.

MODE:
CURRENTLY: MANUAL NO
SET TO: NO/NOX ?

RANGE AVG DIAGS ALARM

©ª

CHANGE VALUE



SAVE VALUE

• In the Main Menu, choose Instrument Controls > Datalogging
Settings.

DATALOGGING SETTINGS:
>SELECT SREC/LREC SREC
VIEW LOGGED DATA
ERASE LOG
SELECT CONTENT
COMMIT CONTENT
RESET TO DEFAULT CONTENT
CONFIGURE DATA LOGGING

RANGE AVG DIAGS ALARM

Select SREC/LREC The Select SREC/LREC is used to select short record or long record format

for other operations in this menu.

• In the Main Menu, choose Instrument Controls > Datalogging Settings
> Select SREC/LREC.

• Use and to scroll through a list of choices.

•Press to set record format.

3-32 Model 42i Low Source Instruction Manual Thermo Electron Corporation

Operation

Instrument Controls Menu

SELECT LOG TYPE:
CURRENTLY: SREC
SET TO: LREC ?



TOGGLE VALUE

RANGE AVG DIAGS ALARM

View Logged Data The View Logged Data screen is used to select the start point to view the

logged data by number of records or date and time.

• In the Main Menu, choose Instrument Controls > Datalogging Settings
> Select SREC or LREC > View Logged Data.

• Use and to toggle between number of records or date and
time.

•Press to accept.

SELECT START POINT BY:

SET TO: # OF RECS

©ª

CHANGE

RANGE AVG DIAGS ALARM



ACCEPT

Number of Records The Number of Records screen is used to select the starting point to display

the number of records back to view.

• Use and to increment or decrement the numeric value.

•Press to set the starting record and continue to the record display
screen.

Thermo Electron Corporation Model 42i Low Source Instruction Manual 3-33

Operation

Instrument Controls Menu

SET # BACK FROM CURRENT:
0000000
TOTAL LRECS: 20

§¨

MOVE CURSOR

©ª

CHANGE VALUE

RANGE AVG DIAGS ALARM



SAVE

The Record Display screen (read only) displays the selected records.

•Use and to view all the items in the record.

• Use and to view records at different times.

time date flags
10:00 06/20/05 FC0088900
11:00 06/20/05 FC0088900
12:00 06/20/05 FC0088900
13:00 06/20/05 FC0088900

©ª

PGUP/DN

RANGE AVG DIAGS ALARM

§¨

PAN L/R

Date and Time The Date and Time screen is used to set a start date and time for which to

view logged data. For example, if “20 JUN 2005 10:00” is entered, then the
first logged data record that is displayed is the first record after this time. If
set to one minute logging, this would be at “20 JUN 2005 10:01”.

• Use and to increment or decrement the selected field.

•Use to advance to next field.

•Press to set the date and time of the first record to be displayed
and continue to the record display screen.

3-34 Model 42i Low Source Instruction Manual Thermo Electron Corporation

Instrument Controls Menu

DATE AND TIME:
20 JUN 2005 10:00

©ª

CHG DAYS

¨

SET CURSOR TO MONTHS



ACCEPT AS SHOWN

RANGE AVG DIAGS ALARM

The Record Display screen (read only) displays the selected records.

•Use and to view all the items in the record.

• Use and to view records at different times.

Operation

time date flags
10:01 06/20/05 FC0088900
10:02 06/20/05 FC0088900
10:03 06/20/05 FC0088900
10:04 06/20/05 FC0088900

©ª

PGUP/DN

RANGE AVG DIAGS ALARM

§¨

PAN L/R

Erase Log The Erase Log is used to erase all saved data for the selected record type (not

all short records and long records).

• In the Main Menu, choose Instrument Controls > Datalogging Settings
> Erase Log.

•Press to erase all data.

•Press

to confirm erasure.

Thermo Electron Corporation Model 42i Low Source Instruction Manual 3-35

Operation

Instrument Controls Menu

ERASE LREC LOG FILE DATA? ERASE LREC LOG FILE DATA?

 ERASE  ERASE

ARE YOU SURE YOU WANT TO?x
PRESS ¨ TO CONFIRM ERASURE

RANGE AVG DIAGS ALARM

Select Content The Select Content submenu displays a list of 32 record fields to use and a

submenu list of the analog output signal group choices to choose from.
Choices are Concentrations, Other Measurements, and Analog Inputs (if
the I/O expansion board is installed). This is a temporary list of items for
the selected record type that must be committed via the datalogging menu
before the changes will apply. Note that committing any changes to this list
will erase all currently logged data, as the format of the stored data is
changed.

• In the Main Menu, choose Instrument Controls > Datalogging Settings
> Select Content.

LREC FIELDS:
>FIELD 1 NO
FIELD 2 NOX
FIELD 3 PRES
FIELD 4 PMTT
FIELD 5 INTT
FIELD 6 CONVT
FIELD 7 NONE

RANGE AVG DIAGS ALARM

ª

RANGE AVG DIAGS ALARM

DATA IN LREC FIELD 1:
>CONCENTRATIONS
OTHER MEASUREMENTS
ANALOG INPUTS

RANGE AVG DIAGS ALARM

3-36 Model 42i Low Source Instruction Manual Thermo Electron Corporation

Operation

Instrument Controls Menu

Concentrations The Concentrations screen allows the user to select the output signal that is

tied to the selected field item. The selected item is shown by “<--” after it.
Note that at this point, pressing indicates that these are proposed
changes as opposed to implemented changes. To change the selected record
format and erase record log file data, see “Commit Content” below. Range

) is visible only in auto range mode.

(NO

x

• In the Main Menu, choose Instrument Controls > Datalogging Settings
> Select Content > Select Field > Concentrations.

• Use and to move the cursor up and down.

• Press to select a new choice.

CONCENTRATIONS:
>NONE
NO <-­ NO2
NOx
LO NO
LO NO2
LO NOx

ª

RANGE AVG DIAGS ALARM

HI NO
HI NO2
HI NOx
RANGE (NOX)

Other Measurements The Other Measurements screen allows the user to select the output signal

that is tied to the selected field item. The selected item is shown by “<--”
after it. Note that at this point, pressing indicates that these are
proposed changes as opposed to implemented changes. To change the
selected record format and erase record log file data, see “Commit Content”
below.

• In the Main Menu, choose Instrument Controls > Datalogging Settings
> Select Content > Select Field > Other Measurements.

• Use and to move the cursor up and down.

• Press to select a new choice.

Thermo Electron Corporation Model 42i Low Source Instruction Manual 3-37

Operation

Instrument Controls Menu

OTHER MEASUREMENTS:
>NONE
INT TEMP
CHAMBER TEMP
COOLER TEMP
NO2 CNV TEMP
CHAMBER PRES
PMT VOLTS

RANGE AVG DIAGS ALARM

OZONATOR FLOW

ª

Analog Inputs The Analog Inputs screen allows the user to select the output signal (none or

analog inputs 1-8) that is tied to the selected field item. The selected item is
shown by “<--” after it. Note that at this point, pressing indicates
that these are proposed changes as opposed to implemented changes. To
change the selected record format and erase record log file data, see
“Commit Content” below.

• In the Main Menu, choose Instrument Controls > Datalogging Settings
> Select Content > Select Field > Analog Inputs.

• Use and to move the cursor up and down.

• Press to select a new choice.

ANALOG INPUTS:
>NONE
ANALOG IN 1
ANALOG IN 2
ANALOG IN 3
ANALOG IN 4
ANALOG IN 5
ANALOG IN 6

RANGE AVG DIAGS ALARM

ª

Commit Content The Commit Content screen is used to save the selected output signal that is

tied to the selected field item. For more information about selecting the
analog output signal group choices, see “Select Content” above.

3-38 Model 42i Low Source Instruction Manual Thermo Electron Corporation

Operation

Instrument Controls Menu

• In the Main Menu, choose Instrument Controls > Datalogging Settings
> Commit Content.

•Press to commit changes to selected record format and erase
record log file data.

•Press to confirm changes.

CHANGE LREC FORMAT AND CHANGE LREC FORMAT AND
ERASE LREC LOG FILE DATA? ERASE LREC LOG FILE DATA?

 COMMIT  COMMIT

ARE YOU SURE YOU WANT TO?x
PRESS ¨ TO CONFIRM CHANGES

RANGE AVG DIAGS ALARM

RANGE AVG DIAGS ALARM

Reset to Default Content The Reset to Default Content screen is used to reset all of the datalogging

field items to default values. For more information about selecting the
analog output signal group choices, see “Select Content” above.

• In the Main Menu, choose Instrument Controls > Datalogging Settings
> Reset to Default Content.

•Press to reset selected record format and erase record log file
data.

•Press

RESET LREC FORMAT AND RESET LREC FORMAT AND
ERASE LREC LOG FILE DATA? ERASE LREC LOG FILE DATA?

 RESET  RESET

to reset.

ARE YOU SURE YOU WANT TO?x
PRESS ¨ TO CONFIRM RESETXX

RANGE AVG DIAGS ALARM

Thermo Electron Corporation Model 42i Low Source Instruction Manual 3-39

RANGE AVG DIAGS ALARM

Operation

Instrument Controls Menu

Configure Datalogging The Configure Datalogging menu deals with datalogging configuration for

Logging Period Min The Logging Period Min screen is used to select the logging period in

the currently selected record type.

• In the Main Menu, choose Instrument Controls > Datalogging Settings
> Configure Datalogging.

DATALOGGING SETTINGS:
>LOGGING PERIOD MIN OFF
MEMORY ALLOCATION % 50
DATA TREATMENT AVG

RANGE AVG DIAGS ALARM

minutes for the record format (srec or lrec). List of choices include: off, 1, 5,
15, 30, and 60 minutes (default).

• In the Main Menu, choose Instrument Controls > Datalogging Settings
> Configure Datalogging > Logging Period Min.

• Use and to scroll through a list of choices.

•Press to set the logging period.

SET PERIOD FOR SREC:
CURRENTLY: OFF MIN
SET TO: 60 MIN ?

©ª

CHANGE VALUE

RANGE AVG DIAGS ALARM



SAVE

Memory Allocation Percent The Memory Allocation Percent screen is used to select the percentage of

each record type for both short records and long records. Percentages
between 0 and 100% are available in increments of 10. Changing this value
results in log erasure for both short records and long records.

3-40 Model 42i Low Source Instruction Manual Thermo Electron Corporation

Operation

Instrument Controls Menu

• In the Main Menu, choose Instrument Controls > Datalogging Settings
> Configure Datalogging > Memory Allocation %.

• Use and to scroll through a list of choices.

•Press to set the percentage for both record types and proceed to
the erasure warning screen.

•Press to confirm change.

SET PERCENT SRECS: SET PERCENT SRECS:
CURRENTLY: 50 % CURRENTLY: 50 %
SET TO: 60 % ? SET TO: 60 % ?

THIS WILL ERASE ALL LOGS!x
PRESS ¨ TO CONFIRM CHANGE

ª CHANGE VALUE  SAVE

RANGE AVG DIAGS ALARM RANGE AVG DIAGS ALARM

Data Treatment The Data Treatment screen is used to select the data type for the selected

record: whether the data should be averaged over the interval, the minimum
or maximum used, or the current value logged. Data treatment doesn’t
apply to all data, just to the concentration measurement. All other data
points log the current value at the end of the interval.

• In the Main Menu, choose Instrument Controls > Datalogging Settings
> Configure Datalogging > Data Treatment.

• Use and to scroll through a list of choices.

•Press to set the data type.

SET LREC DATA TYPE:
CURRENTLY: AVG
SET TO: CUR ?

©ª

CHANGE VALUE

RANGE AVG DIAGS ALARM

Thermo Electron Corporation Model 42i Low Source Instruction Manual 3-41



SAVE

Operation

Instrument Controls Menu

Communication Settings The communication Settings menu is used with communications control

and configuration.

• In the Main Menu, choose Instrument Controls > Communication
Settings.

COMMUNICATION SETTINGS:
>BAUD RATE
INSTRUMENT ID
COMMUNICATION PROTOCOL
STREAMING DATA CONFIG
RS-232/RS-485 SELECTION
TCP/IP SETTINGS

RANGE AVG DIAGS ALARM

Baud Rate The Baud Rate screen is used to set the RS-232/RS-485 interface baud rate.

Baud rates of 1200, 2400, 4800, and 9600, 19200, 38400, 57600, and
115200 are available.

• In the Main Menu, choose Instrument Controls > Communication
Settings > Baud Rate.

• Use and to scroll through a list of choices.

•Press to save the new baud rate.

BAUD RATE:
CURRENTLY: 9600
SET TO: 19200 ?

©ª

CHANGE VALUE



SAVE VALUE

RANGE AVG DIAGS ALARM

Instrument ID The Instrument ID screen allows the operator to edit the instrument ID.

The ID is used to identify the instrument when using the C-Link or
MODBUS protocols to control the instrument or collect data. It may be
necessary to edit the ID number if two or more of the same instrument are
connected to one computer over the serial port. Valid Instrument ID
numbers are from 0 to 127. The Model 42i Low Source has a default

3-42 Model 42i Low Source Instruction Manual Thermo Electron Corporation

Operation

Instrument Controls Menu

Instrument ID of 42. For more information about the Instrument ID, see
Appendix B “C-Link Protocol Commands” or Appendix C “MODBUS
Protocol”.

• In the Main Menu, choose Instrument Controls > Communication
Settings > Instrument ID.

• Use and to increment or decrement the ID value.

•Press to save the new instrument ID.

INSTRUMENT ID:
CURRENTLY: 42
SET TO: 50 ?

RANGE AVG DIAGS ALARM

©ª

CHANGE VALUE



SAVE VALUE

Communication Protocol The Communication Protocol screen is used to change the instrument

communication protocol for serial communications. This does not affect
communications over Ethernet, because the protocols are processed
simultaneously on different ports.

In the Main Menu, choose Instrument Controls > Communication Settings
> Communication Protocol.

• Use and to scroll through a list of choices.

•Press to save the new protocol.

COMMUNICATION PROTOCOL:
CURRENTLY: CLINK
SET TO: STREAMING ?

RANGE AVG DIAGS ALARM

©ª

CHANGE VALUE



SAVE VALUE

Thermo Electron Corporation Model 42i Low Source Instruction Manual 3-43

Operation

Instrument Controls Menu

Streaming Data Configuration The Streaming Data Configuration menu is used to allow for configuration

of the 18 streaming data output items, streaming interval, current data
format, and current time. The Choose Stream Data submenu displays a list
of the analog signal group choices to choose from. Choices are
Concentrations, Other Measurements, and Analog Inputs (if the I/O
expansion board option is installed).

Note Add Labels and Prepend Timestamp are toggle items that change
between yes or no when selected. 

• In the Main Menu, choose Instrument Controls > Communication
Settings > Streaming Data Config.

STREAMING DATA CONFIG:
INTERVAL 10 SEC
ADD LABELS NO
PREPEND TIMESTAMP YES
>ITEM 1 NO2
ITEM 2 INTT
ITEM 3 PRES
ITEM 4 NONE

ª

RANGE AVG DIAGS ALARM

CHOOSE STREAM DATA:
>CONCENTRATIONS
OTHER MEASUREMENTS
ANALOG INPUTS

RANGE AVG DIAGS ALARM

Streaming Data Interval The Streaming Data Interval screen is used to adjust the streaming data

interval. The following interval times are available: 1, 2, 5, 10, 20, 30, 60,
90, 120, 180, 240, and 300 seconds.

• In the Main Menu, choose Instrument Controls > Communication
Settings > Streaming Data Config > Interval.

• Use and to scroll through a list of choices.

3-44 Model 42i Low Source Instruction Manual Thermo Electron Corporation

Operation

Instrument Controls Menu

• Press to save the new streaming data period.

STREAMING DATA INTERVAL:
CURRENTLY: 10 SEC
SET TO: 20 SEC ?

©ª

CHANGE VALUE



SAVE VALUE

RANGE AVG DIAGS ALARM

Concentrations The Concentrations screen allows the user to select the output signal that is

tied to the selected streaming data item. The selected item is shown by “<--”
after it. In dual or auto range mode, “High” or “Low” is displayed to
indicate high or low concentrations. Range (NOx) is visible only in auto
range mode.

• In the Main Menu, choose Instrument Controls > Communication
Settings > Streaming Data Config > Select Item > Concentrations.

• Use and to move the cursor up and down.

• Press to select a new choice.

CONCENTRATIONS:
>NONE
NO <-­ NO2
NOx
RANGE (NOX)

RANGE AVG DIAGS ALARM

Other Measurements The Other Measurements screen allows the user to select the output signal

that is tied to the selected streaming data item. The selected item is shown
by “<--” after it.

• In the Main Menu, choose Instrument Controls > Communication
Settings > Streaming Data Config > Select Item > Other
Measurements.

Thermo Electron Corporation Model 42i Low Source Instruction Manual 3-45

Operation

Instrument Controls Menu

• Use and to move the cursor up and down.

• Press to select a new choice.

OTHER MEASUREMENTS:
>NONE
INT TEMP
CHAMBER TEMP
COOLER TEMP
NO2 CNV TEMP
CHAMBER PRES
PMT VOLTS

RANGE AVG DIAGS ALARM

Analog Inputs The Analog Inputs screen allows the user to select the output signal (none or

analog inputs 1-8) that is tied to the selected streaming data item. The
selected item is shown by “<--” after it.

• In the Main Menu, choose Instrument Controls > Communication
Settings > Streaming Data Config > Select Item > Analog Inputs.

• Use and to move the cursor up and down.

• Press to select a new choice.

ANALOG INPUTS:
>NONE
ANALOG IN 1
ANALOG IN 2
ANALOG IN 3
ANALOG IN 4
ANALOG IN 5
ANALOG IN 6

RANGE AVG DIAGS ALARM

ª

RS-232/RS-485 Selection The RS-232/RS-485 Selection screen allows the user to choose between the

RS-232 or RS-485 specification for serial communication.

Note Disconnect the serial cable before changing RS-232 and RS-485
selection to prevent damage to the connected equipment.



• In the Main Menu, choose Instrument Controls > Communication
Settings > RS-232/RS-485 Selection.

3-46 Model 42i Low Source Instruction Manual Thermo Electron Corporation

Operation

Instrument Controls Menu

•Press to leave the warning screen and move to next screen.

• Use to confirm and save the new selection change.

RS-232/RS-485 SELECTION: RS-232/RS-485 SELECTION:

XXXXXX** WARNING **XXXXXXX CURRENTLY: RS-232

DISCONNECT THE SERIALX X SET TO: RS-485 ?
CABLES BEFORE CHANGING X MAKE SURE THAT THE CABLEXX
THE SELECTION!XXXXXX

 TO CONTINUE

IS OFF: PRESS

 TOGGLE VALUE

¨ TO CONFIRM

RANGE AVG DIAGS ALARM

TCP/IP Settings The TCP/IP Settings menu is used for defining TCP/IP settings.

• In the Main Menu, choose Instrument Controls > Communication
Settings > TCP/IP Settings.

TCP/IP SETTINGS:
>USE DHCP OFF
IP ADDRESS 192.168.1.15
NETMASK 255.255.255.0
GATEWAY 192.168.1.1
HOST NAME ISERIES

RANGE AVG DIAGS ALARM

Use DHCP The Use DHCP screen is used to specify whether to use DHCP or not.

RANGE AVG DIAGS ALARM

Note The instrument power must be cycled after this parameter has been
changed for the change to take effect.



• In the Main Menu, choose Instrument Controls > Communication
Settings > TCP/IP Settings > Use DCHP.

•Press to toggle and set DHCP on or off.

Thermo Electron Corporation Model 42i Low Source Instruction Manual 3-47

Operation

Instrument Controls Menu

DHCP:
CURRENTLY: OFF
SET TO: ON ?

CYCLE POWER TO CHANGE DHCP

RANGE AVG DIAGS ALARM

 TOGGLE VALUE

IP Address The IP Address screen is used to edit the IP address.

• In the Main Menu, choose Instrument Controls > Communication
Settings > TCP/IP Settings > IP Address.

• Use , , and to move and change the value of
the IP address.

•Press to save the new address.

IP ADDRESS:
CURRENT: 192.168.1.15
SET TO: 192.168.1.15 1

§¨

MOVE CURSOR

©ª

CHANGE VALUE



SAVE

RANGE AVG DIAGS ALARM

Netmask The Netmask screen is used to edit the netmask address.

• In the Main Menu, choose Instrument Controls > Communication
Settings > TCP/IP Settings > Netmask.

• Use , , and to move and change the value of
the netmask.

•Press to save the new address.

3-48 Model 42i Low Source Instruction Manual Thermo Electron Corporation

NETMASK:
CURRENT: 255.255.255.0
SET TO: 255.255.255.000

§¨

MOVE CURSOR

©ª

CHANGE VALUE



SAVE

RANGE AVG DIAGS ALARM

Gateway The Gateway screen is used to edit the gateway address.

• In the Main Menu, choose Instrument Controls > Communication
Settings > TCP/IP Settings > Gateway.

• Use , , and to move and change the value of
the gateway address.

Operation

Instrument Controls Menu

•Press to save the new address.

DEFAULT GATEWAY:
CURRENT: 192.168.1.1
SET TO: 192.168.1.1 1

§¨

MOVE CURSOR

©ª

CHANGE VALUE



SAVE

RANGE AVG DIAGS ALARM

Host Name The host name screen is used to edit the host name. When DHCP is

enabled, this name is reported to the DHCP server.

• In the Main Menu, choose Instrument Controls > Communication
Settings > TCP/IP Settings > Host Name.

• Use , , and to move the cursor or change
between the edit field and the alpha page.

•Press to save the new letter in the alpha table or save the new
alpha page.

Thermo Electron Corporation Model 42i Low Source Instruction Manual 3-49

Operation

Instrument Controls Menu

I/O Configuration The I/O Configuration menu deals with configuration of the analyzer’s I/O

HOST NAME:
CURRENT: ISERIES

ISERIES SSSSSS?

ABCDEFGHIJKLMN BKSP

OPQRSTUVWXYZ PAGE
0123456789 ./- SAVE

RANGE AVG DIAGS ALARM

system. The analog input configuration is displayed if the I/O expansion
board option is installed.

• In the Main Menu, choose Instrument Controls > I/O Configuration.

I/O CONFIGURATION:
>OUTPUT RELAY SETTINGS
DIGITAL INPUT SETTINGS
ANALOG OUTPUT CONFIG
ANALOG INPUT CONFIG

RANGE AVG DIAGS ALARM

Output Relay Settings The Output Relay Settings menu displays a list of the 10 analog output

relays available, and allows the user to select the logic state and instrument
parameter for the relay selected.

Note The digital outputs may take up to one second after the assigned state
occurs to show up on the outputs. 

• In the Main Menu, choose Instrument Controls > I/O Configuration >
Output Relay Settings.

3-50 Model 42i Low Source Instruction Manual Thermo Electron Corporation

Operation

Instrument Controls Menu

OUTPUT RELAY SETTINGS:
>1 NOP GEN ALARM
2 NOP NONE
3 NOP UNITS
4 NOP CONC ALARM
5 NOP NONE
6 NOP NONE
7 NOP NO MODE

RANGE AVG DIAGS ALARM

ª

Logic State The Logic State screen is used to change the I/O relay to either normally

open or normally closed.

•Press to toggle and set the logic state between open or closed.

OUTPUT RELAY SETUP:
>LOGIC STATE OPEN
INSTRUMENT STATE

RANGE AVG DIAGS ALARM

Instrument State The Instrument State submenu allows the user to select the instrument state

that is tied to the selected relay output. A submenu lists signal types of
either alarms or non-alarm to choose from.

• In the Main Menu, choose Instrument Controls > I/O Configuration >
Output Relay Settings > Select Relay > Instrument State.

CHOOSE SIGNAL TYPE:
>ALARMS
NON-ALARM

RANGE AVG DIAGS ALARM

Thermo Electron Corporation Model 42i Low Source Instruction Manual 3-51

Operation

Instrument Controls Menu

Alarms The Alarms status screen allows the user to select the alarm status for the

selected relay output. The selected item is shown by “<--” after it. Items
displayed are determined by the options installed.

• In the Main Menu, choose Instrument Controls > I/O Configuration >
Output Relay Settings > Select Relay > Instrument State > Alarms.

• Use and to scroll through a list of choices.

• Press to save the new selection for the relay.

ALARM STATUS ITEMS:
>NONE
GEN ALARM <-­ NO CONC MAX
NO CONC MIN
NO2 CONC MAX
NO2 CONC MIN
NOx CONC MAX

ª

RANGE AVG DIAGS ALARM

NOx CONC MIN
INT TEMP
CHAMB TEMP
COOLER TEMP
NO2 CV TEMP
PRESSURE
OZONE FLOW
MB STATUS
MIB STATUS
I/O BD STATUS
CONC ALARM

Non-Alarm The Non-Alarm status screen allows the user to select the non-alarm status

for the selected relay output. The selected item is shown by “<--” after it.
Items displayed are determined by the options installed.

• In the Main Menu, choose Instrument Controls > I/O Configuration >
Output Relay Settings > Select Relay > Instrument State > Non-Alarm.

• Use and to scroll through a list of choices.

• Press to save the new selection for the relay.

3-52 Model 42i Low Source Instruction Manual Thermo Electron Corporation

Operation

Instrument Controls Menu

NON ALARM STATUS ITEMS:
>NONE
AUTORANGE (NOx)
SERVICE
UNITS
ZERO MODE
SPAN MODE
NO MODE

RANGE AVG DIAGS ALARM

NOX MODE
SAMPLE MODE
PURGE MODE

ª

Digital Input Settings The Digital Input Settings menu displays a list of the 16 digital inputs

available, and allows the user to select the logic state and instrument
parameter for the relay selected.

Note The digital inputs must be asserted for at least one second for the
action to be activated. 

• In the Main Menu, choose Instrument Controls > I/O Configuration >
Digital Input Settings.

DIGITAL INPUT SETTINGS:
>1 NOP NO MODE
2 NOP NOX MODE
3 NOP SET BACKGROUND
4 NOP CAL TO LO SPAN
5 NOP AOUTS TO ZERO
6 NOP AOUTS TO FS
7 NOP NONE

RANGE AVG DIAGS ALARM

ª

Logic State The Logic State screen is used to change the I/O relay to either normally

open or normally closed. The default state is open, which indicates that a
relay connected between the digital input pin and ground is normally open
and closes to trigger the digital input action. If nothing is connected to the
digital input pin, the state should be left at open to prevent the action from
being triggered.

•Press to toggle and set the logic state open or closed.

Thermo Electron Corporation Model 42i Low Source Instruction Manual 3-53

Operation

Instrument Controls Menu

Instrument Action The Instrument Action screen allows the user to select the instrument state

DIGITAL INPUT SETUP:
>LOGIC STATE OPEN
INSTRUMENT ACTION

RANGE AVG DIAGS ALARM

that is tied to the selected digital input. The selected item is shown by “<--”
after it.

• In the Main Menu, choose Instrument Controls > I/O Configuration >
Digital Input Settings > Select Relay > Instrument Action.

• Use and to scroll through a list of choices.

• Press to save the new selection for the relay.

CHOOSE ACTION:
>NONE
ZERO MODE
SPAN MODE
NO MODE <-­ NOX MODE
SET BACKGROUND
CAL TO LO SPAN

RANGE AVG DIAGS ALARM

AOUTS TO ZERO
AOUTS TO FS
CAL TO HI SPAN

ª

Analog Output Configuration The Analog Output Configuration menu displays a list of the analog output

channels available for configuration. Channel choices include all voltage
channels, all current channels, voltage channels 1-6, and current channels
1-6 (if the I/O expansion board option is installed). Configuration choices
include selecting range, setting minimum/maximum values, and choosing
signal to output.

3-54 Model 42i Low Source Instruction Manual Thermo Electron Corporation

Operation

Instrument Controls Menu

• In the Main Menu, choose Instrument Controls > I/O Configuration >
Analog Output Config.

OUTPUT CHANNELS:
>ALL VOLTAGE CHANNELS
ALL CURRENT CHANNELS
VOLTAGE CHANNEL 1
VOLTAGE CHANNEL 2
VOLTAGE CHANNEL 3
VOLTAGE CHANNEL 4
VOLTAGE CHANNEL 5

RANGE AVG DIAGS ALARM

ANALOG OUTPUT CONFIG:
>SELECT RANGE
SET MINIMUM VALUE
SET MAXIMUM VALUE
CHOOSE SIGNAL TO OUTPUT

ª

RANGE AVG DIAGS ALARM

Select Output Range The Select Output Range screen is used to select the hardware range for the

selected analog output channel. Possible ranges for the voltage outputs are:
0-100 mV, 0-1, 0-5, 0-10 V.

• In the Main Menu, choose Instrument Controls > I/O Configuration >
Analog Output Config > Select Channel > Select Range.

• Use and to move the cursor up and down.

• Press to save the new range.

SELECT OUTPUT RANGE:
SELECTED OUTPUT: V ALL
CURRENTLY: 0-10V
SET TO: 0-5V ?

©ª CHANGE VALUE  SAVE

RANGE AVG DIAGS ALARM

Thermo Electron Corporation Model 42i Low Source Instruction Manual 3-55

Operation

Instrument Controls Menu

Minimum and Maximum Value The MinimumValue screen is used to edit the zero (0) to full-scale (100)

value in percentages for the selected analog output channel. See Table 3-7
for a list of choices. The minimum and maximum output value screens
function the same way. The example below shows the set minimum value
screen.

• In the Main Menu, choose Instrument Controls > IO Configuration >
Analog Output Config > Select Channel > Set Minimum or Maximum
Val ue .

• Use and to increment or decrement the numeric value.

• Press to validate and save the new minimum value.

MINIMUM OUTPUT PERCENT:
SELECTED OUTPUT: V ALL
CURRENTLY: N/A %
SET TO: 0000.5 % ?

©ª CHANGE VALUE  SAVE

RANGE AVG DIAGS ALARM

Table 3-7. Analog Output Zero to Full-Scale Table

Output Zero % Value Full-Scale 100% Value

NO Zero (0) Range Setting

NO

2

NO

x

LO NO Zero (0) Range Setting

LO NO

2

LO NO

x

HI NO Zero (0) Range Setting

HI NO

2

HI NO

x

Range Status (NO

Internal Temp User-set alarm min value User-set alarm max value

Chamber Temp User-set alarm min value User-set alarm max value

Cooler Temp User-set alarm min value User-set alarm max value

) Recommend not to change the setting for this output

x

Zero (0) Range Setting

Zero (0) Range Setting

Zero (0) Range Setting

Zero (0) Range Setting

Zero (0) Range Setting

Zero (0) Range Setting

3-56 Model 42i Low Source Instruction Manual Thermo Electron Corporation

Operation

Instrument Controls Menu

Table 3-7. Analog Output Zero to Full-Scale Table

Output Zero % Value Full-Scale 100% Value

NO2 Converter Temp User-set alarm min value User-set alarm max value

Chamber Pressure User-set alarm min value User-set alarm max value

PMT Volts 700 volts 1100 volts

Everything Else 0 units 10 units

Choose Signal to Output The Choose Signal to Output screen displays a submenu list of the analog

output signal group choices. Group choices are Concentrations, Other
Measurements, and Analog Inputs (if the I/O expansion board option is
installed). This allows the user to select the output signal to the selected
output channel. The Concentrations screen is shown below. See Table 3-8
below for a list of items for each signal group choice.

• In the Main Menu, choose Instrument Controls > I/O Configuration >
Analog Output Config > Select Channel > Choose Signal To Output.

• Use and to move the cursor up and down.

• Press to select a choice.

CHOOSE SIGNAL - CONC
SELECTED OUTPUT: V1
CURRENTLY: NONE
SET TO: NONE ?

©ª

CHANGE VALUE

RANGE AVG DIAGS ALARM



SAVE

Table 3-8. Signal Type Group Choices

Concentrations Other Measurements Analog Inputs

None None None

NO (single/auto range mode) Internal Temp Analog Input 1

NO

(single/auto range mode) Chamber Temp Analog Input 2

2

NO

(single/auto range mode) Cooler Temp Analog Input 3

x

LO NO (dual mode) NO

Thermo Electron Corporation Model 42i Low Source Instruction Manual 3-57

Converter Temp Analog Input 4

2

Operation

Instrument Controls Menu

Analog Input Configuration The Analog Input Configuration menu displays a list of the 8 analog input

Table 3-8. Signal Type Group Choices

Concentrations Other Measurements Analog Inputs

LO NO2 (dual mode) Chamber Pressure Analog Input 5

LO NO

(dual mode) PMT Volts Analog Input 6

x

HI NO (dual mode) Analog Input 7

HI NO

(dual mode) Analog Input 8

2

HI NO

(dual mode)

x

Range (NO

) (auto range mode)

x

channels available for configuration. This screen is displayed if the I/O
expansion board option is installed. Configuration includes entering
descriptor, units, decimal places, choice of 1-10 points in the table, and
corresponding number of points selected.

• In the Main Menu, choose Instrument Controls > I/O Configuration >
Analog Input Config.

ANALOG INPUT CONFIG:
>CHANNEL 1 IN1
CHANNEL 2 IN2
CHANNEL 3 IN3
CHANNEL 4 IN4
CHANNEL 5 IN5
CHANNEL 6 IN6
CHANNEL 7 IN7

RANGE AVG DIAGS ALARM

ANALOG INPUT 01 CONFIG:
>DESCRIPTOR IN1
UNITS V
DECIMAL PLACES 2
TABLE POINTS 2
POINT 1
POINT 2

ª

RANGE AVG DIAGS ALARM

3-58 Model 42i Low Source Instruction Manual Thermo Electron Corporation

Operation

Instrument Controls Menu

Descriptor The Descriptor screen allows the user to enter the descriptor for the selected

analog input channel. The descriptor is used in datalogging and streaming
data to report what data is being sent out. The descriptor may be from 1 to
3 characters in length, and defaults to IN1 to IN8 (user input channel
number).

• In the Main Menu, choose Instrument Controls > I/O Configuration >
Analog Input Config > Select Channel > Descriptor.

• Press to save the new descriptor.

ANALOG INPUT DESCRIPTOR:
CURRENTLY: IN1

IN1

ABCDEFGHIJKLMN BKSP
OPQRSTUVWXYZ PAGE
0123456789 ./- SAVE

RANGE AVG DIAGS ALARM

Units The Units screen allows the user to enter the units for the selected analog

input channel. The units are displayed on the diagnostic screen and in
datalogging and streaming data. The units may be from 1 to 3 characters in
length, and defaults to V (volts).

• In the Main Menu, choose Instrument Controls > I/O Configuration >
Analog Input Config > Select Channel > Units.

• Press to save the new value.

ANALOG INPUT UNITS:
CURRENTLY: V

VSS

ABCDEFGHIJKLMN BKSP
OPQRSTUVWXYZ PAGE
0123456789 ./- SAVE

RANGE AVG DIAGS ALARM

Thermo Electron Corporation Model 42i Low Source Instruction Manual 3-59

Operation

Instrument Controls Menu

Decimal Places The Decimal Places screen allows the user to select how many digits are

displayed to the right of the decimal, from 0 to 6, with a default of 2.

• In the Main Menu, choose Instrument Controls > I/O Configuration >
Analog Input Config > Select Channel > Decimal Places.

• Use and to increment or decrement the value.

• Press to save the new value.

DECIMAL PLACES:
CURRENTLY: 2
SET TO: 3 ?

©ª

INC/DEC



SAVE VALUE

RANGE AVG DIAGS ALARM

Number of Table Points The Number of Table Points screen allows the user to select how many

points are used in the conversion table. The points range from 2 to 10, with
a default of 2.

• In the Main Menu, choose Instrument Controls > I/O Configuration >
Analog Input Config > Select Channel > Table Points.

• Use and to move the cursor up and down.

• Press to save the new value.

NUMBER OF TABLE POINTS:
CURRENTLY: 2
SET TO: 10 ?

RANGE AVG DIAGS ALARM

©ª

INC/DEC



SAVE VALUE

3-60 Model 42i Low Source Instruction Manual Thermo Electron Corporation

Operation

Instrument Controls Menu

Table Point The Table Point submenu allows the user to set up an individual table

point.

• In the Main Menu, choose Instrument Controls > I/O Configuration >
Analog Input Config > Select Channel > Point 1-10.

TABLE POINT 01 CONFIG:
>VOLTS 0.00
USER VALUE 0.00

RANGE AVG DIAGS ALARM

Volts The Volts screen allows the user to set the input voltage for the selected

table point in the conversion table from 0.00 to 10.50. The default table is a
two-point table with point 1: 0.00 V = 000.0 U and point 2: 10.00 V =

10.0 U.

• In the Main Menu, choose Instrument Controls > I/O Configuration >
Analog Input Config > Select Channel > Select Point > Vo lt s.

• Use and to move the cursor up and down.

• Press to save the new value.

TABLE POINT 01 VOLTS:
CURRENTLY: 0.00
SET TO: 00.00

§¨

MOVE CURSOR

©ª

CHANGE VALUE

RANGE AVG DIAGS ALARM



SAVE

Thermo Electron Corporation Model 42i Low Source Instruction Manual 3-61

Operation

Instrument Controls Menu

User Value The User Value screen allows the user to set the output value for the

corresponding input voltage for the selected table point in the conversion
table from -9999999 to 99999999. The default table is a two-point table
with point 1: 0.00 V = 000.0 U and point 2: 10.00 V = 10.0 U.

• In the Main Menu, choose Instrument Controls > I/O Configuration >
Analog Input Config > Select Table Point > User Value.

• Use and to move the cursor up and down.

• Press to save the new value.

TABLE POINT 01 USER VAL:
CURRENTLY: 0.00
SET TO: 00000.00

§¨

MOVE CURSOR

©ª

CHANGE VALUE



SAVE

Temperature

Compensation

RANGE AVG DIAGS ALARM

Temperature compensation provides compensation for any changes to the
instrument's output signal due to internal instrument temperature
variations. The effects of internal instrument temperature changes on the
analyzer's subsystems and output have been empirically determined. This
empirical data is used to compensate for any changes in temperature. This
compensation can be used for special applications, or when operating the
instrument outside the recommended temperature range, even though the
Model 42i Low Source does not require temperature compensation for EPA
equivalency.

When temperature compensation is on, the display shows the current
internal instrument temperature (measured by a thermistor on the Interface
board). When temperature compensation is off, the display shows the
factory standard temperature of 30 °C.

• In the Main Menu, choose Instrument Controls > Temperature
Compensation.

•Press to toggle and set the temperature compensation on or off.

3-62 Model 42i Low Source Instruction Manual Thermo Electron Corporation

Instrument Controls Menu

TEMPERATURE COMPENSATION:
COMP TEMP: 30.0
CURRENTLY: OFF
SET TO: ON ?

RANGE AVG DIAGS ALARM

 TOGGLE VALUE

o

C

Pressure Compensation Pressure compensation provides compensation for any changes to the

instrument's output signal due to reaction chamber pressure variations. The
effects of reaction chamber pressure changes on the analyzer's subsystems
and output have been empirically determined. This empirical data is used to
compensate for any change in reaction chamber pressure. This
compensation can be used even though the Model 42i Low Source does not
require pressure compensation for EPA equivalency.

Operation

When pressure compensation is on, the first line of the display represents
the current pressure in the reaction chamber. When pressure compensation
is off, the first line of the display shows the factory standard pressure of 150
mmHg.

• In the Main Menu, choose Instrument Controls > Pressure
Compensation.

•Press to toggle and set the pressure compensation on or off.

PRESSURE COMPENSATION:
COMP PRES: 150.0 mmHg
CURRENTLY: OFF
SET TO: ON ?



TOGGLE VALUE

RANGE AVG DIAGS ALARM

Thermo Electron Corporation Model 42i Low Source Instruction Manual 3-63

Operation

Instrument Controls Menu

Screen Contrast The Screen Contrast screen is used to change the contrast of the display.

Intensities between 0 and 100% in increments of 10 are available. Changing
the screen contrast may be necessary if the instrument is operated at extreme
temperatures.

• In the Main Menu, choose Instrument Controls > Screen Contrast.

• Use and to increment or decrement the screen contrast.

•Press to accept a change.

SCREEN CONTRAST:
CURRENTLY: 50 %
SET TO: 60 % ?

RANGE AVG DIAGS ALARM

©ª CHANGE VALUE

 SAVE VALUE

Service Mode The Service Mode screen is used to turn the service mode on or off. The

service mode locks out any remote actions and includes parameters and
functions that are useful when making adjustments or diagnosing the Model
42i Low Source. For more information about the service mode, see “Service
Menu” later in this chapter.

Note The service mode should be turned off when finished, as it prevents
remote operation.

• In the Main Menu, choose Instrument Controls > Service Mode.

•Press to toggle and set the service mode on or off.

SERVICE MODE:
CURRENTLY: OFF
SET TO: ON ?

RANGE AVG DIAGS ALARM



 TOGGLE VALUE

3-64 Model 42i Low Source Instruction Manual Thermo Electron Corporation

Date/Time The Date/Time screen and allows the user to view and change the system

date and time (24-hour format). The internal clock is powered by its own
battery when instrument power is off.

• In the Main Menu, choose Instrument Controls > Date/Time.

• Use , , and to move and change the value of
the date and time.

•Press to edit and save the new date and time.

DATE AND TIME:
19 MAR 2005 12:34:56 DATE AND TIME:
PRESS

 TO EDIT

19 MAR 2005 12:34:56 ?

SETTING: DAYS

¨ SET MONTHS

©ª CHANGE VALUE

 SAVE VALUE

Operation

Diagnostics Menu

RANGE AVG DIAGS ALARM

RANGE AVG DIAGS ALARM

Diagnostics Menu The Diagnostics menu provides access to diagnostic information and

functions. This menu is useful when troubleshooting the instrument. The
analog input readings and analog input voltages are displayed if the I/O
expansion board option is installed.

• In the Main Menu, choose Diagnostics.

DIAGNOSTICS:
>PROGRAM VERSION
VOLTAGES
TEMPERATURES
PRESSURE
FLOW
ANALOG INPUT READINGS
ANALOG INPUT VOLTAGES

RANGE AVG DIAGS ALARM

ª

DIGITAL INPUTS
RELAY STATES
TEST ANALOG OUTPUTS
INSTRUMENT CONFIGURATION
CONTACT INFORMATION

Thermo Electron Corporation Model 42i Low Source Instruction Manual 3-65

Operation

Diagnostics Menu

Program Version The Program Version screen (read only) shows the version number of the

program installed. Prior to contacting the factory with any questions
regarding the instrument, please note the program version number.

• In the Main Menu, choose Diagnostics > Program Version.

PROGRAM VERSION:
PRODUCT: MODEL 42iLS
VERSION: 01.00.01.074

RANGE AVG DIAGS ALARM

Voltages The Voltages menu displays the current diagnostic voltage readings. This

screen enables the power supply to be quickly read for low or fluctuating
voltages without having to use a voltage meter. The I/O board is displayed if
the I/O expansion board option is installed.

• In the Main Menu, choose Diagnostics > Vo lt ag es .

VOLTAGES:
>MOTHERBOARD
INTERFACE BOARD
I/O BOARD

RANGE AVG DIAGS ALARM

Motherboard Voltages The Motherboard screen (read only) is used to display the current voltage

readings on the motherboard.

• In the Main Menu, choose Diagnostics > Voltages > Motherboard
Vo lt a ge s.

3-66 Model 42i Low Source Instruction Manual Thermo Electron Corporation

Operation

Diagnostics Menu

MOTHERBOARD VOLTAGES:

3.3 SUPPLY 3.3 V

5.0 SUPPLY 5.0 V

15.0 SUPPLY 15.0 V

24.0 SUPPLY 24.0 V

-3.3 SUPPLY -3.3 V

RANGE AVG DIAGS ALARM

Interface Board Voltages The Interface Board screen (read only) is used to display the current voltage

readings on the interface board.

• In the Main Menu, choose Diagnostics > Voltages > Interface Board
Vo lt a ge s.

INTERFACE BOARD VOLTAGES:
PMT SUPPLY 785.5 V

3.3 SUPPLY 3.3 V

5.0 SUPPLY 5.0 V

15.0 SUPPLY 15.0 V
P15.0 SUPPLY 15.0 V

24.0 SUPPLY 24.0 V

-15.0 SUPPLY -15.0 V

RANGE AVG DIAGS ALARM

I/O Board Voltages The I/O Board screen (read only) is used to display the current voltage

readings on the I/O expansion board. This screen is displayed if the I/O
expansion board option is installed.

• In the Main Menu, choose Diagnostics > Voltages > I/O Board
Vo lt a ge s.

I/O BOARD VOLTAGES:

3.3 SUPPLY 3.3 V

5.0 SUPPLY 5.0 V
15 0 SUPPLY 15.0 V

24.0 SUPPLY 24.0 V

-3.0 SUPPLY -3.0 V

RANGE AVG DIAGS ALARM

Thermo Electron Corporation Model 42i Low Source Instruction Manual 3-67

Operation

Diagnostics Menu

Temperatures The Temperatures screen (read only) displays the internal temperature,

reaction chamber temperature, cooler temperature, and converter
temperatures. The internal temperature is the air temperature measured by a
sensor located on the interface board.

• In the Main Menu, choose Diagnostics > Temperatures.

TEMPERATURES:
>INTERNAL 28.6
CHAMBER 49.0
COOLER -2.8
NO2 CONVERTER 625.0
NO2 CONV SET 625.0

RANGE AVG DIAGS ALARM

o

C

o

C

o

C

o

C

o

C

Pressure The Pressure screen (read only) displays the reaction chamber pressure. The

pressure is measured by a pressure transducer at the reaction chamber.

• In the Main Menu, choose Diagnostics > Pressure.

CHAMBER PRES: 151.6 mmHg

RANGE AVG DIAGS ALARM

Flow The Flow screen (read only) displays the ozone flow rate. An internal flow

sensor measures the ozone flow. For more information, see Chapter 1,
“Introduction”.

• In the Main Menu, choose Diagnostics > Flow.

3-68 Model 42i Low Source Instruction Manual Thermo Electron Corporation

Diagnostics Menu

OZONATOR FLOW: OK

RANGE AVG DIAGS ALARM

Analog Input Readings The Analog Input Readings screen (read only) displays the 8 current

user-scaled analog readings (if the I/O expansion board option is installed).

• In the Main Menu, choose Diagnostics > Analog Input Readings.

Operation

ANALOG INPUT READINGS:
>CO 10.2 PPM
SO2 18.2 PPB
CO2 250 PPM
FL1 20.42 LPM
WND 9.86 V
FL2 1.865 LPM
IO7 0.0 V

RANGE AVG DIAGS ALARM

ª

Analog Input Voltages The Analog Input Voltages screen (read only) displays the 8 raw analog

voltage readings (if the I/O expansion board option is installed).

• In the Main Menu, choose Diagnostics > Analog Input Voltages.

ANALOG INPUT VOLTAGES:
>ANALOG IN 1 6.24 V
ANALOG IN 2 4.28 V
ANALOG IN 3 0.00 V
ANALOG IN 4 0.00 V
ANALOG IN 5 0.00 V
ANALOG IN 6 0.00 V
ANALOG IN 7 0.00 V

ª

RANGE AVG DIAGS ALARM

Thermo Electron Corporation Model 42i Low Source Instruction Manual 3-69

Operation

Diagnostics Menu

Digital Inputs The Digital Inputs screen (read only) displays the state of the 16 digital

inputs.

• In the Main Menu, choose Diagnostics > Digital Inputs.

DIGITAL INPUTS:
>INPUT 1 1
INPUT 2 1
INPUT 3 1
INPUT 4 1
INPUT 5 1
INPUT 6 1
INPUT 7 1

RANGE AVG DIAGS ALARM

ª

Relay States The Relay States screen displays the state of the 10 digital outputs and

allows toggling of the state to either on (1) or off (0). The relays are restored
to their original states upon exiting this screen.

• In the Main Menu, choose Diagnostics > Relay States.

RELAY STATE:
>OUTPUT 1 0
OUTPUT 2 0
OUTPUT 3 0
OUTPUT 4 1
OUTPUT 5 0
OUTPUT 6 0
OUTPUT 7 0

RANGE AVG DIAGS ALARM

ª

Test Analog Outputs The Test Analog Outputs menu contains a number of digital to analog

converter (DAC) calibration items. Channel choices include all analog
outputs, 6 voltage channels, and 6 current channels (if the I/O expansion
board option is installed).

• In the Main Menu, choose Diagnostics > Test Analog Outputs.

3-70 Model 42i Low Source Instruction Manual Thermo Electron Corporation

Operation

Diagnostics Menu

TEST ANALOG OUTPUTS:
>ALL
VOLTAGE CHANNEL 1
VOLTAGE CHANNEL 2
VOLTAGE CHANNEL 3
VOLTAGE CHANNEL 4
VOLTAGE CHANNEL 5
VOLTAGE CHANNEL 6

RANGE AVG DIAGS ALARM

ª

Set Analog Outputs The Set Analog Outputs screen contains three choices: Set to full-scale, set

to zero, or reset to normal. Full-scale sets the analog outputs to the full-scale
voltage, zero sets the analog outputs to 0 volts, and normal operation. The
example below shows the selected output state “ALL” is set to normal.

• In the Main Menu, choose Diagnostics > Test Analog Outputs > ALL,
Voltage Channel 1-6, or Current Channel 1-6.

• Use and to move the cursor up and down.

• Press to select a choice.

SET ANALOG OUTPUTS:
SETTING: ALL
OUTPUT SET TO: NORMAL

©

SET TO FULL SCALE

ª

SET TO ZERO

§

RESET TO NORMAL

RANGE AVG DIAGS ALARM

Thermo Electron Corporation Model 42i Low Source Instruction Manual 3-71

Operation

Diagnostics Menu

Instrument Configuration The Instrument Configuration screen displays information on the hardware

configuration of the instrument.

Note If the analyzer is in service mode, pressing on the item will
toggle it yes or no. 

• In the Main Menu, choose Diagnostics > Instrument Configuration.

•Press to toggle instrument configuration (in service mode only).

INSTRUMENT CONFIGURATION:
>I/O EXPANSION BOARD YES
ZERO SPAN VALVES YES
LAG VOLUME NO
PERM DRYER NO
CONVERTER SS
DILUTION NO
AUTO CALIBRATION NO

RANGE AVG DIAGS ALARM

Contact Information The Contact Information screen displays the customer service information.

• In the Main Menu, choose Diagnostics > Contact Information.

CONTACT INFORMATION:

CALL CENTER: 508-520-0430

WEB: WWW.THERMO.COM

RANGE AVG DIAGS ALARM

3-72 Model 42i Low Source Instruction Manual Thermo Electron Corporation