Bruker IFS 125M User Manual

Download

IFS 125M

User Manual

1015996

1st version 2012, publication date June 2012

refers to hardware revision as of January 2012 refers to firmware revision 2.240

www.brukeroptics.com

All rights reserved. No part of this manual may be reproduced or transmitted in any form or by any means including printing, photocopying, microfilm, electronic systems etc. with out our prior written permission. Brand names, registered trademarks etc. used in this manual, even if not explicitly marked as such, are not to be considered unprotected by trademarks law. They are the property of their respective owner.

This manual is the original documentation for the IFS 125M spectrometer.

Table of Contents

1 Introduction....................................................................................................9

1.1 About this manual..................................................................................................... 9

1.2 Terms ..................................................................................................................... 10

1.3 Safety ..................................................................................................................... 10

1.3.1 Warning labels........................................................................................................ 10

1.3.2 Waste disposal ....................................................................................................... 12

1.4 General information................................................................................................ 12

1.4.1 Protective earthing ................................................................................................. 12

1.4.2 Qualified personnel ................................................................................................ 12

1.4.3 Intended use........................................................................................................... 13

1.5 Questions and concerns......................................................................................... 13

2 General .........................................................................................................15

2.1 Design .................................................................................................................... 15

2.2 Optics ..................................................................................................................... 15

2.3 Electronics.............................................................................................................. 15

2.4 Data acquisition...................................................................................................... 16

3 Installation....................................................................................................17

3.1 Delivery contents.................................................................................................... 17

3.2 Packaging............................................................................................................... 18

3.3 Transportation ........................................................................................................ 18

3.4 Site requirements ................................................................................................... 18

3.5 Connection ports .................................................................................................... 20

3.6 Connecting procedures .......................................................................................... 22

3.6.1 Connecting cables to the mobile electronics unit ................................................... 22

3.6.2 Overview on cables connected .............................................................................. 23

3.7 Connecting spectrometer to power supply ............................................................. 24

3.7.1 Connecting spectrometer to a PC .......................................................................... 25

3.7.2 Connecting accessories via CAN bus .................................................................... 26

3.7.3 Connecting spectrometer to purge gas supply line ................................................ 26

3.8 Inserting beamsplitter ............................................................................................. 27

3.8.1 Handling instructions .............................................................................................. 27

3.8.2 Inserting procedure ................................................................................................ 28

4 Description...................................................................................................31

4.1 Spectrometer front side .......................................................................................... 31

4.2 Spectrometer rear side........................................................................................... 32

Bruker Optik GmbH IFS 125M User Manual

Table of Contents

4.3 Sample compartment ............................................................................................. 33

4.4 Beamsplitter lid....................................................................................................... 33

4.4.1 Beamsplitter types.................................................................................................. 34

4.5 Detector hoods ....................................................................................................... 35

4.5.1 Detector types ........................................................................................................ 35

4.6 Scanner compartment ............................................................................................ 37

4.7 Input ports............................................................................................................... 38

4.8 Output port.............................................................................................................. 39

4.9 Mobile electronics unit ............................................................................................ 40

4.9.1 Panel types............................................................................................................. 40

4.10 Optical path ............................................................................................................ 42

5 Operation......................................................................................................43

5.1 Operating safety ..................................................................................................... 43

5.2 Switching spectrometer on and off ......................................................................... 44

5.3 Spectrometer operating phase ............................................................................... 45

5.4 Starting spectroscopy software .............................................................................. 46

5.4.1 Setting up the connection to the optics................................................................... 46

5.5 Inserting accessory into sample compartment ....................................................... 47

5.5.1 Inserting procedure................................................................................................. 47

5.6 Checking the signal ................................................................................................ 48

5.6.1 Procedure............................................................................................................... 48

5.7 Performing measurement....................................................................................... 50

5.7.1 Types of measurement........................................................................................... 50

5.7.2 Measurement parameters ...................................................................................... 50

5.7.3 Measuring procedure.............................................................................................. 51

5.8 Changing beamsplitter............................................................................................ 52

5.8.1 Handling instructions .............................................................................................. 52

5.8.2 Changing procedure............................................................................................... 53

5.9 Cooling detector ..................................................................................................... 55

5.9.1 Safety instructions when working with liquid nitrogen ............................................ 56

5.9.2 Cooling procedure .................................................................................................. 57

5.10 Changing detector .................................................................................................. 58

5.10.1 Changing procedure ............................................................................................... 58

5.11 Purging the spectrometer ....................................................................................... 65

6 Maintenance.................................................................................................67

6.1 General maintenance considerations ..................................................................... 67

6.1.1 Electrostatic discharge ........................................................................................... 68

6.2 Checking laser signal ............................................................................................. 68

6.2.1 Amplitude................................................................................................................ 68

6.2.2 Quick check in OPUS ............................................................................................. 69

IFS 125M User Manual Bruker Optik GmbH

Table of Contents

6.2.3 Signal decrease over optical path .......................................................................... 71

6.2.4 Readjusting laser.................................................................................................... 73

6.2.5 Phase ..................................................................................................................... 76

6.2.6 Remounting covers ................................................................................................ 77

6.3 Replacing source.................................................................................................... 79

6.3.1 Source types .......................................................................................................... 79

6.3.2 Handling instructions for tungsten source .............................................................. 80

6.3.3 Replacing procedure .............................................................................................. 81

6.4 Replacing window .................................................................................................. 82

6.4.1 Window material..................................................................................................... 83

6.4.2 Replacing procedure .............................................................................................. 85

6.4.3 Example of window assembly ................................................................................ 85

6.5 Evacuating detector................................................................................................ 87

6.5.1 Evacuating tools required....................................................................................... 88

6.5.2 Evacuating procedure ............................................................................................ 89

6.6 Checking drive cable .............................................................................................. 92

6.6.1 Checking procedure ............................................................................................... 93

6.6.2 Adjusting procedure ............................................................................................... 94

6.7 Transporting spectrometer ..................................................................................... 95

6.7.1 Removing covers.................................................................................................... 95

6.7.2 Moving and fixing scanner...................................................................................... 97

6.7.3 Removing beamsplitter........................................................................................... 99

6.7.4 Removing optical fiber cable ................................................................................ 100

6.7.5 Demounting complete scanning arm.................................................................... 103

6.7.6 Fastening all transport locking screws ................................................................. 105

6.7.7 Remounting covers .............................................................................................. 106

6.7.8 Detaching all cables ............................................................................................. 108

6.8 Re-installation after transport of spectrometer ..................................................... 109

6.8.1 Removing covers.................................................................................................. 109

6.8.2 Remounting complete scanning arm.................................................................... 111

6.8.3 Re-inserting optical fiber cable ............................................................................. 112

6.8.4 Connecting cables................................................................................................ 114

6.8.5 Inserting beamsplitter ........................................................................................... 114

6.8.6 Checking laser signals ......................................................................................... 114

6.8.7 Checking optical alignment .................................................................................. 115

6.8.8 Remounting covers .............................................................................................. 118

6.9 Re-adjusting fiber-coupling head.......................................................................... 120

6.10 Cleaning housing.................................................................................................. 122

7 Troubleshooting ........................................................................................123

7.1 General information on fault diagnostics .............................................................. 123

7.1.1 Remote fault diagnostics via full report ................................................................ 124

Bruker Optik GmbH IFS 125M User Manual

Table of Contents

7.2 Status light in the OPUS spectroscopy software .................................................. 125

7.2.1 Instrument Status dialog in OPUS........................................................................ 126

7.2.2 Spectrometer problems indicated by diagnostics pages of hardware

components .......................................................................................................... 127

7.3 Spectrometer problems indicated by an error message in OPUS........................ 128

7.4 Spectrometer problems indicated by file parameters in OPUS ............................ 129

7.5 No interferogram observable in Check Signal mode ............................................ 130

7.6 Spectrometer problems indicated by diagnostics LEDs ....................................... 133

7.6.1 Voltage status LEDs ............................................................................................. 133

7.6.2 ERR and SR LEDs ............................................................................................... 135

7.7 No data transfer between spectrometer and PC .................................................. 137

7.7.1 RX LED permanently off....................................................................................... 137

7.7.2 Green RX LED on while trying to establish a connection, but the yellow

TX LED off ............................................................................................................ 138

8 Web Interface .............................................................................................139

8.1 Access rights ........................................................................................................ 139

8.2 User authentication............................................................................................... 140

8.2.1 Activating user authentication............................................................................... 140

8.2.2 Deactivating user authentication .......................................................................... 142

8.3 Spectrometer diagnostics pages .......................................................................... 143

8.3.1 Direct command entry .......................................................................................... 145

8.3.2 Diagnostics........................................................................................................... 150

8.3.3 Service.................................................................................................................. 158

8.3.4 Full report ............................................................................................................. 165

8.3.5 Direct control panel............................................................................................... 169

9 Data Communication.................................................................................171

9.1 Configuration types............................................................................................... 172

9.1.1 General rules........................................................................................................ 172

9.1.2 Connecting spectrometer to a stand-alone PC (standard) ................................... 172

9.1.3 Connecting spectrometer and PC to a network.................................................... 173

9.1.4 Connecting spectrometer to network PC.............................................................. 175

9.2 Network addresses............................................................................................... 176

9.2.1 Standard configuration: connecting spectrometer to a stand-alone PC ............... 176

9.2.2 Optional configuration: spectrometer and PC connected to a network ................ 176

9.2.3 Optional configuration: spectrometer connected to network PC .......................... 177

9.3 Assigning network addresses............................................................................... 178

9.4 Communication between spectrometer and PC ................................................... 180

10 Connection Ports.......................................................................................181

10.1 Flange panel......................................................................................................... 182

IFS 125M User Manual Bruker Optik GmbH

Table of Contents

10.2 Electronics connections and LEDs....................................................................... 185

10.3 User input/output signals (UIO signals) ................................................................ 191

10.3.1 Pin assignment..................................................................................................... 191

10.3.2 Timing................................................................................................................... 192

10.4 Power supply panel .............................................................................................. 194

A Specifications ............................................................................................197

A.1 Additional information to the resolution specifications.......................................... 200

B Spare Parts.................................................................................................201

C Default Parameter Settings.......................................................................203

D Dimensional Drawings ..............................................................................205

E Firmware Update .......................................................................................209

E.1 Firmware update on CD ....................................................................................... 209

E.2 Firmware update via E-mail.................................................................................. 209

E.3 Performing firmware update ................................................................................. 210

E.4 Restoring a previous firmware version ................................................................. 212

E.5 Backing up the current firmware version .............................................................. 213

F Glossary .....................................................................................................215

G Addresses ..................................................................................................221

Index ...........................................................................................................223

Bruker Optik GmbH IFS 125M User Manual

Table of Contents

IFS 125M User Manual Bruker Optik GmbH

1 Introduction

1.1 About this manual

This manual is a complete documentation about the IFS 125M FT-IR spectrometer.

Depending on the degree of hazard important safety information and safety instructions are classified as follows:

➣ Indicates a hazardous situation which, if not avoided, will result in death or serious

(possibly irreversible) injury.

➣ Indicates a hazardous situation which, if not avoided, could result in death or seri-

ous (possibly irreversible) injury.

DANGER

WARNING

CAUTION

➣ Indicates a hazardous situation which, if not avoided, may result in minor or mod-

erate (reversible) injury or major material damage.

NOTE

➣ Hazard, which could result in material damage if the appropriate safety instruc-

tions are not observed.

Information given to the user to facilitate spectrometer operation, and make the best

possible use of the spectrometer.

Bruker Optik GmbH IFS 125M User Manual

Introduction 1

1.2 Terms

This manual uses both the term spectrometer or IFS 125M when the spectrometer is described.

1.3 Safety

Always observe the instructions described in this manual to ensure user safety and to avoid property damage. Keep this manual for further reference available at any time.

Improper use or failure to follow the safety instructions can result in serious injuries and/ or property damage. Any non-observance infringes the intended use (i.e. spectroscopic measurements) of the spectrometer. In this case Bruker Optik GmbH does not assume any liability.

It is the operator's duty to plan and implement all necessary safety measures and to supervise their observance. Moreover, the operator must ensure that the spectrometer is in proper condition and fully functioning. A safe and faultless operation can only be guar anteed if the spectrometer is transported, stored, installed, operated and maintained properly according to the procedures and instructions described in this manual.

Never remove or deactivate any supporting safety systems during spectrometer operation. Objects and/or material not required for operation must not be kept near the spectrometer operating area.

The spectrometer has been developed according to the EN 61010-1:2010 (IEC 610101:2010+Cor.:2011) safety regulations for electrical measuring, control and laboratory devices.

1.3.1 Warning labels

When operating the spectrometer you have to observe a number of safety instructions which are highlighted by the appropriate warning label. The warning labels and their meaning are described in the following.

All warning labels on the spectrometer must always be kept legible. Immediately replace worn or damaged labels.

Label Definition

General Hazard:

This warning symbol indicates general hazard. Observe the safety instructions and follow the precautions described to avoid personal injury and/or property damage.

Table 1.1: Warning labels

IFS 125M User Manual Bruker Optik GmbH

Label Definition

Frostbite:

This warning symbol indicates cryogenic liquids (e.g. liquid nitrogen) required to operate the spectrometer (e.g. cooling detector).

Exposure to these liquids or cooled components causes frostbite effects. Handle the liquids with utmost care. Observe the safety instructions for operating with cryogenic liquids.

Hot Surface:

This warning symbol refers to components and surfaces which can become very hot during spectrometer operation. Do not touch these components and surfaces. Risk of skin burn! Be careful when operat ing near hot components and/or surfaces.

Laser Radiation:

This warning symbol indicates the existence of laser radiation. Never look directly into the laser beam, or use any kind of optical instruments to look into the beam as this may cause permanent eye damage.

Introduction 1

Table 1.1: Warning labels

1.3.1.1 In case of hazardous sample material

Besides the dangers described above, there can also be hazards caused by the sample material. Depending on the type of hazardous substances used, you have to observe the specific substance-relevant safety instructions. Put on the specific warning label on the corresponding module position. The label must be legible and permanently discern ible.

The following list exemplifies types of hazardous sample material:

Label Definition

Infectious Material

This warning symbol indicates the possible existence of biologically dangerous and infectious material. When working with this kind of material always observe the prevailing laboratory safety regulations and take necessary precautions and disinfection measures (e.g. wear ing protective clothing, masks, gloves etc.). Non-observance may cause severe personal injury or even death.

For information on how to use, dilute and efficiently apply disinfectants, refer to the Laboratory Biosafety Manual: 1984 by WHO - World Health Organization.

Table 1.2: Warning labels in case of hazardous sample material

Bruker Optik GmbH IFS 125M User Manual

Introduction 1

Label Definition

Table 1.2: Warning labels in case of hazardous sample material

Radioactive Material

This warning symbol indicates the possible existence of radioactivity. When working with radioactive material always observe the safety reg ulations and take necessary protective measures. Wear protective clothing, e.g. masks and gloves. Non-observance may cause severe personal injury or even death.

Corrosive Substances

This warning symbol indicates the possible existence of corrosive substances. When working with corrosive substances always observe the laboratory safety regulations, and take protective measures (e.g. wear protective masks and gloves). Non-observance may cause severe personal injury or even death.

1.3.2 Waste disposal

Dispose all waste produced (chemicals, infectious and radioactively contaminated substances etc.) according to the prevailing laboratory regulations. Detergents and cleaning agents must be disposed according to the special waste regulations.

1.4 General information

1.4.1 Protective earthing

To avoid personal injuries and/or damage caused by electrical power, the supplied spectrometer power cord is equipped with a safety plug. Connect this safety plug only to an earthed power socket. Make sure that the earthed power socket used complies with IEC (International Electrotechnical Commission

1.4.2 Qualified personnel

Initial installation and all maintenance and repair work not described in this manual should only be performed by Bruker service personnel. Make sure that the spectrometer is only operated and maintained (i.e. only maintenance work that is described in this manual) by authorized operating personnel trained in the spectrometer operation and all relevant safety aspects.

1. International standards organization for electrical and electronic-related technologies.

IFS 125M User Manual Bruker Optik GmbH

All repairs, adjustments and alignments on any spectrometer component must be performed in accordance with the safety regulations and standards applied in the country where the instrument will be installed.

1.4.3 Intended use

The spectrometer and its components should only be used according to the instructions described in the manual or advised by a Bruker engineer.

In case of accessories or components made by other manufacturers and used in connection with the spectrometer, Bruker Optik GmbH does not assume any liability for safe operation and proper functioning.

1.5 Questions and concerns

Introduction 1

If you have questions or concerns about safety, operating the spectrometer, or if you need assistance with software problems or replacement parts, contact Bruker at the numbers listed below:

• Service hotline hardware: +49 (0) 72 43 504-2020

• Service hotline software: +49 (0) 7243 504-2030

• Fax: +49 (0) 72 43 504-2100

• E-mail: service@brukeroptics.com

• Internet: www.brukeroptics.com

Bruker Optik GmbH IFS 125M User Manual

Introduction 1

IFS 125M User Manual Bruker Optik GmbH

2 General

The IFS 125M spectrometer is a mobile high resolution FT-IR spectrometer and has been designed to perform field operation and precise stratospheric analysis, generate atmospheric emission studies, and remotely monitor atmospheric pollutants.

Atmospheric pollution can be measured in transmittance, using the sun as active IR radiation source.

For stratospheric transmittance measurements, the solar radiation is collected by a solar tracker system, which automatically follows the position of the solar source. It has been proven that this technique can also be used with the moon as IR source, despite the orders of magnitude lower radiation power.

2.1 Design

• Compact optics housing

• Detachable interferometer scanning arm

• Purgeable enclosure for interferometer, scanner and detectors

2.2 Optics

• Spectral range starting from the mid-infrared (MIR) region at 450 up to the ultraviolet range of 45000 cm

• Spectral resolution of 0.008 cm-1 (optionally: 0.0035 cm-1) in the MIR region

• Resolving power of >10

• Up to 2 internal detectors

• Permanently aligned, 30° cube-corner mirror interferometer

2.3 Electronics

The spectrometer is equipped with a mobile (separate) electronics unit which uses Ethernet connectivity, and a 24 station, laptop etc.), with the OPUS spectroscopy software installed, can be used to control the spectrometer and perform data processing.

Analog to Digital Conversion (ADC) electronics allow high resolution measurements from the MIR through the near-infrared (NIR) region, up to the visible and ultraviolet (VIS/UV) spectral ranges.

Functions such as checking measurement parameters allow fast and reliable FT-IR spectroscopic measurements. Optical components, e.g, source and beamsplitter, are electronically coded so that the spectrometer firmware can recognize them.

-1

V DC power supply. Any modern data system (PC work-

In addition, the permanent online check of spectrometer components facilitates error diagnostics and maintenance.

Bruker Optik GmbH IFS 125M User Manual

General 2

2.4 Data acquisition

The data acquisition is based on a free running delta-sigma A/D converter with 24 bit dynamic range. The series of time equidistant samples is converted into samples equi distant in optical path difference, according to James Brault’s scheme. A digital signal processor does the conversion in real time.

During natural phenomena such as sunset and sunrise in which the absorbance path is considerably extended, the available measurement time is limited. Therefore, the dual channel data acquisition technique in connection with a dichroic beamsplitter allows par allel data acquisition with two dedicated and optimized detectors in one or two different spectral ranges.

IFS 125M User Manual Bruker Optik GmbH

3 Installation

Unpacking and initial installation of the spectrometer is done by Bruker service engineers. The operating company has to provide an installation site that meets the site requirements described in this chapter.

3.1 Delivery contents

The IFS 125M spectrometer allows upgrading with additional components and/or accessories. Depending on the spectrometer configuration ordered, the delivery contents may not include all optional components listed below.

Standard components: • IFS 125M spectrometer

• Electronics unit

• External power supply unit with low-voltage cable and power cord, including country-specific power plug

• Data cable (100Base-T cross-over cable)

• PC compatible data system (including Windows or Linux operating system)

• OPUS spectroscopy software (spectrometer control, data acquisition, manipulation and evaluation)

• IFS 125M user manual

•Spare parts

Optional components: • Other OPUS application software pack-

ages (e.g. QUANT, IDENT) and the respective user manuals

• Accessories

Table 3.1: Delivery contents

Bruker Optik GmbH IFS 125M User Manual

Installation 3

3.2 Packaging

Damaged packaging

Injury and/or property damage

➣ Contact shipping company.

➣ Do not put spectrometer into operation.

3.3 Transportation

CAUTION

Due to its weight (approx. 120 kg) the spectrometer should be carried by at least 3 persons. When transporting the spectrometer, use the original packaging to avoid damages.

3.4 Site requirements

The operating company has to provide an installation site that meets the following site requirements:

Environment: • Temperature range: 18 - 35°C

Electromagnetic interferences:

• Humidity (non-condensing): less than 80% (relative humidity)

• The spectrometer is shielded against electromagnetic interferences.

• Do not locate the spectrometer near potential inductive electrical interference, high energy pulses and high electric or magnetic fields.

• Use lines which are separated from those which are connected to machines (e.g. elevators, large electric motors, etc.) with large electrical surges or bursts.

Table 3.2: Site requirements

IFS 125M User Manual Bruker Optik GmbH

Installation 3

NOTE

Power supplya:

The spectrometer power supply unit automatically adapts to the most common power sources.

• Valid voltage range: 100 V AC to 240 V AC

• Valid frequency range: 50 to 60 Hz

• Additionally, any power supply via any 24 V DC source is possible (load 5

No uninterruptible power supply:

Property damage.

➣ Always ensure uninterruptible power supply (UPS)

and/or a line conditioner.

How to interrupt power supply:

• Either switch off the spectrometer using the ON/OFF switch, which is located on the front side of the mobile electronics unit or

• unplug the power cable from the primary power receptacle (AC inlet), which is located at the power supply unit or

• unplug the power cable from the mains outlet

Space: • Stable and horizontal base which is able to bear the

weight of at least 160

• For exact dimensions refer to appendix A.

Temperature variations: • Less than 1°C per hour and not more than 4°C per

day

• Avoid temperature variations as they can impair the results of long-term measurements

Vibration: Do not locate the spectrometer in high traffic areas,

nor near vibration sources (ventilation hoods, air con

ditioners etc.).

Table 3.2: Site requirements

a. If you connect external accessories to the spectrometer interface such as R232 (serial), Ethernet or

LPT1 (parallel), these accessories must comply with the requirements outlined in EN 61010 or EN

60950. This means that you always have to connect a SELV circuit (Safety Extra Low Voltage Circuit) to a corresponding SELV circuit and not to any other circuit type.

Bruker Optik GmbH IFS 125M User Manual

Installation 3

Figure 3.1: Connection ports on electronics unit

3.5 Connection ports

The connection ports are located on the mobile electronics unit and electronics boxes.

Definition

A CAN bus connector

B Main power switch

C Low-voltage sockets (both ports are con-

nected via a y-cable)

D Ethernet port

Table 3.3: Connection port definition on electronics unit

IFS 125M User Manual Bruker Optik GmbH

Installation 3

Figure 3.2: Connection ports on left and right electronics box

A B

Definition

A Light switch board port (LSB)

B Solar tracker port (not used)

C CAN bus connector (all equivalent)

D Outer motor port (OMOT)

E Digital detector connection port (DDC)

Table 3.4: Connection port definition of electronics boxes

Bruker Optik GmbH IFS 125M User Manual

Installation 3

3.6 Connecting procedures

3.6.1 Connecting cables to the mobile electronics unit

On panel: Connect... ...with...

Electronics: LASER cable from HeNe laser

(located in upper panel)

ICON ICON at flange panel

Sources receptacle at calibration

source

OMOT OMOT at left electronics

box

Flange:

DDC0

DDCa at right electronics box

DDC1

DDCa at right electronics box

LSB122 LSB at the left electronics

box

CAN

Table 3.5: Connecting cables to the mobile electronics unit

a. All DDC receptacles are equivalent, no specific order has to be observed.

b. All CAN receptacles are equivalent, no specific order has to be observed.

CAN at left electronics box

CAN at right electronics box

IFS 125M User Manual Bruker Optik GmbH

3.6.2 Overview on cables connected

Figure 3.3: Overview on cables connected

Installation 3

Bruker Optik GmbH IFS 125M User Manual

Installation 3

CAUTION

3.7 Connecting spectrometer to power supply

1 Switch off spectrometer.

☞ The switch must be in the OFF

position.

2 Use a y-cable and connect one end to

the 24

V in port, and the other to the

DC port.

3 Connect the power cord to the C5

socket of the external power supply.

4 Connect the power plug of the power

cord to the mains socket outlet.

Power plug of the power cord not connected to a socket outlet with earthing contact.

Personal injury and property damage

➣ Connect power plug only to a socket

with earthing contact.

Safety Instructions

To ensure a safe operation of the external power supply unit, observe the following safety instructions:

• Operate the external power supply unit only in a dry environment.

• Make sure that the external power supply unit is not exposed to direct sunlight. Avoid temperatures above +50°C. Ensure that there is sufficient air circulation.

IFS 125M User Manual Bruker Optik GmbH

• Properly position the external power supply unit to avoid the danger of tripping over it.

• Do not put heavy objects on the external power supply unit.

• Do not place the external power supply unit on a hot surface.

• If the external power supply unit is damaged disconnect it instantly from the supply circuit. Never put a damaged external power supply unit into operation. Only authorized technicians are allowed to repair the external power supply unit.

3.7.1 Connecting spectrometer to a PC

1 The main power switch must be in the OFF

position.

Installation 3

2 Connect one end of the cross-over data cable

3 Connect the other end of the cross-over data cable to the RJ-45 socket of

the computer network interface card. (In case of different connection topolo gies, see chapter 9.2)

Table 3.6: Connecting spectrometer to a PC

3.7.1.1 IP address

The spectrometer IP address has been set to 10.10.0.1 by Bruker. If the delivery content of your spectrometer configuration does not include a Bruker PC, you have to assign an appropriate IP address to the type of PC to be used. For detailed information on how to assign an IP address refer to chapter

to the ETH socket on the mobile electronics unit.

9.3.

Bruker Optik GmbH IFS 125M User Manual

Installation 3

3.7.2 Connecting accessories via CAN bus

1 Connect the CAN bus cable to the CAN bus

connector located at the mobile electronics unit.

Table 3.7: Connecting accessories via CAN bus

3.7.3 Connecting spectrometer to purge gas supply line

The spectrometer has one purge gas inlet to purge the interferometer and detector compartment. This is only required if the spectrometer is operated in a humid environment.

Tools required and not included in the delivery content: stiff purge hose (PVC), outer diameter: 6

1 Pull off the plug from the purge gas inlet.

2 • Insert one end of the hose into the purge

mm.

gas inlet (A).

• Connect the other end of the hose to your purge gas supply line. The supplied gas must be dry and oil-free (see chapter for details).

• Control the purge gas flow by the purge gas controller (B).

5.11

Table 3.8: Connecting spectrometer to purge gas supply line

IFS 125M User Manual Bruker Optik GmbH

3.8 Inserting beamsplitter

During initial installation, the beamsplitter needs to be inserted. All beamsplitter types available for the spectrometer are electronically coded, enabling the spectrometer firm ware to auto-detect the beamsplitter type currently installed.

The data about the beamsplitter type are transferred to the spectroscopy software.

Inadequate handling:

Beamsplitter may become useless.

➣ Handle the beamsplitter with utmost care to ensure long service life.

➣ Observe the handling instructions described in chapter 3.8.1.

Installation 3

NOTE

3.8.1 Handling instructions

• Do not touch the beamsplitter surface as the beamsplitter may become useless. Always hold the beamsplitter on the two knobs (A in figure

• The surface of some beamsplitters (especially KBr beamsplitters) is hygroscopic. Never expose them to humidity, water or aqueous solutions. Always store the beamsplitter in a sealed container and in dry environment, e.g. in the beamsplitter storage box. Fix the protective covers onto the beamsplitter (figure

3.4b). The covers provide mechanical protection, but do not protect

against humidity!

• Do not try to loosen or fasten the screws (B in figure 3.4a) as this will impair the optical quality of the beamsplitter.

• Do not try to clean the beamsplitter. This will definitely damage the beamsplitter irreversibly.

• Do not expose the beamsplitter (especially beamsplitters made of KBr) to large temperature changes. In particular, a cold KBr beamsplitter must not be exposed to a warmer ambience, as this will lead to condensation of humidity.

3.4a).

Bruker Optik GmbH IFS 125M User Manual

Installation 3

Figure 3.4a: Beamsplitter

Figure 3.4b: Beamsplitter with protective

cover

CAUTION

3.8.2 Inserting procedure

1 Use a cross-head screwdriver (size PH2) and

2 Carefully lift off the lid.

Table 3.9: Inserting beamsplitter

rotate the 2 screws of the top lid counterclock wise.

➣ You have to rotate over the snap-in resis-

tance. Then, the screw is pushed upwards, and you can loosen it.

Open lid:

Risk of exposure to laser light, which can cause permanent eye damage.

➣ Do not stare into the laser beam.

IFS 125M User Manual Bruker Optik GmbH

Installation 3

3 Open the beamsplitter locking door by moving

the release lever.

4 • Hold the beamsplitter - with two hands - on

the knobs and carefully insert the beamsplit ter straight downwards into the fixture, with the electrical contacts facing to the scanner side and without catching an edge.

• The two guiding pins have to engage into the slots located on the block.

• Push down the beamsplitter completely, until you feel resistance.

5 Close the beamsplitter locking door by moving

the release lever.

6 The spectrometer beeps when it detects the new beamsplitter and automati-

cally starts scanning.

• Put on the lid again.

• Use the cross-head screwdriver. Push the screws downwards and rotate them clockwise.

• Check the laser signals as described in chapter 6.2.

• Check whether a signal is detected, and the optics works properly. More details are described in chapter

• If you use VIS and UV beamsplitters, the interferometer has to be realigned by the OPUS Auto Align function (see chapter

Table 3.9: Inserting beamsplitter

5.6.

5.8.2).

Bruker Optik GmbH IFS 125M User Manual

Installation 3

IFS 125M User Manual Bruker Optik GmbH

4 Description

Figure 4.1: Spectrometer front side

F G

This chapter describes all relevant spectrometer compartments.

The local indications right and left assume that the operator stands in front of the spec-

trometer. The same applies to the indication front and rear side, respectively.

4.1 Spectrometer front side

Definition

A Sample compartment lid

C Left electronics box

D Beamsplitter lid

E Detector hoods

F Right electronics box

Bruker Optik GmbH IFS 125M User Manual

G Scanner compartment

Table 4.1: Spectrometer front side

a. Can be used to observe the image of the external source, e.g.

Viewing port

the sun, on the aperture.

Description 4

Figure 4.2: Spectrometer rear side

C D E

4.2 Spectrometer rear side

Definition

A Detector hoods

B Direct input port for collimated beam

C Beamsplitter lid

Viewing port

E Sample compartment lid

F Source (for calibration purpose)

G Standard input port for collimated beam

Table 4.2: Spectrometer rear side

a. Can be used to observe the image of the external source, e.g.

the sun, on the aperture.

IFS 125M User Manual Bruker Optik GmbH

4.3 Sample compartment

Figure 4.3a: Sample compartment with lid Figure 4.3b: Sample compartment with gas cell

Figure 4.4a: Closed beamsplitter lid Figure 4.4b: Open beamsplitter lid

The sample compartment can be accessed by lifting the blue top lid. For calibration purpose the sample compartment can accommodate e.g. a 10 cm calibration gas cell. This gas cell is fixed by 2 retaining clips.

Description 4

How to insert the gas cell is described in chapter 5.5.

4.4 Beamsplitter lid

The spectrometer is equipped with a permanently-aligned Michelson interferometer, cube-corner mirrors and a beamsplitter.

The interferometer has a 30° angle of incidence. This narrow angle of incidence makes more effective use of the beamsplitter and reduces polarization effects.

How to change the beamsplitter is described in chapter 5.8.

Bruker Optik GmbH IFS 125M User Manual

Description 4

NOTE

CAUTION

4.4.1 Beamsplitter types

The spectrometer can be configured with the following beamsplitter types:

Description

KBr beamsplitter (with multilayer coating)

Hygroscopic!

➣ Avoid any contact to

humidity.

➣ Do not touch or clean

the surface.

➣ Always store in a dry

place

CaF

Harmful

➣ Do not inhale or swal-

low dust or particles.

➣ Avoid any eye and skin

contact.

➣ Observe the safety

data sheet.

Spectral regiona (cm-1)

4,800 - 450 T301/2

NIR, 14,000 - 1,850 T401/2

Part number

Quarz with dielectric coatings

Quarz with metallic coatings

Table 4.3: Beamsplitter types

a. The combination of light source, beamsplitter and detector defines the measurement range. It is lim-

ited by the component with the most narrow range.

VIS, 25,000 - 9,500 T501/2

VIS + UV, 45,000 - 20,000 T601/2

IFS 125M User Manual Bruker Optik GmbH

4.5 Detector hoods

Figure 4.5a: Detector hoods mounted Figure 4.5b: Detector hoods removed

CAUTION

The spectrometer can accommodate up to 2 internal detectors. In the standard configuration the spectrometer is equipped with a liquid N2-cooled MCT detector system for MIR spectral range and high spectral sensitivity.

Description 4

Apart from the standard detector there is a large number of optional detectors available. All detectors are mounted on dovetail slides which allow an easy interchange.

4.5.1 Detector types

The following table contains the most important types of detectors to be used with the spectrometer. For further detector options contact Bruker.

Description

DLATGS 12,000 - 350 D301/3

InGaAs 12,800 - 5,800 D424/2

InSb, liquid-nitrogen cooled

Harmful

➣ Observe the safety

instructions when cool ing.

Spectral regiona (cm-1)

9,600 - 1,850 D413/2 (12 h)

Part number

D413-L/2 (24 h)

Table 4.4: Detector types

Bruker Optik GmbH IFS 125M User Manual

Description 4

CAUTION

Description

MCT, narrow band, liquidnitrogen cooled

Harmful

➣ Observe the safety

instructions when cool ing.

MCT, broad band, liquidnitrogen cooled

Harmful

➣ Observe the safety

instructions when cool ing.

MCT, medium band, liquid-nitrogen cooled

Spectral regiona (cm-1)

5,000 - 780 D313/2 (12 h)

7,000 - 420 D315/2 (12 h)

6,000 - 600 D316/2 (12 h)

Part number

D313-L/2 (24 h)

D315-L/2 (24 h)

D316-L/2 (24 h)

Harmful

➣ Observe the safety

instructions when cool ing.

Si diode 30,000 - 9,000 D510/2

Table 4.4: Detector types

a. The combination of light source, beamsplitter and detector defines the measurement range. It is lim-

ited by the component with the most narrow range.

IFS 125M User Manual Bruker Optik GmbH

4.6 Scanner compartment

Figure 4.6a: Closed scanner compartment Figure 4.6b: Open scanner compartment

A short and a long version of the scanner arm are available. The scanner is driven by 2 drive units, i.e. 1 DC (direct current) motor and 1 linear drive unit. These two drive units are also called the outer and inner scanner.

Description 4

The outer scanner ensures the continuous movement, while the main function of the inner scanner is to compensate the fluctuations of the outer scanner. For low resolution measurement the inner scanner is activated, only.

Based on the laser interference signal, the inner scanner compensates the fluctuations. To compensate the tilting of the inner scanner this scanner uses a displacement sensor (digital encoder).

The scanner movement is controlled by the HeNe laser signal. To avoid any malfunctions with regard to mechanical scanner movements make sure that the bearings are always free of any visible deposits.

Bruker Optik GmbH IFS 125M User Manual

Description 4

Figure 4.7: Input ports

4.7 Input ports

Ensuring electromagnetic shielding requires a conductive connection between accessory and spectrometer, and a complete metallic enclosure of the accessory without any slits or openings larger than 4 with (metallic) blank flanges.

cm are required. Unused ports have always to be covered

If the port opening has a clear aperture of more than 4 cm, the port will not be shielded any more according to electromagnetic compatibility as soon as the blank flange is removed.

NOTE

Clear port aperture of port opening >4 cm:

No shield safety according to EMCa requirements.

➣ Accessory connected must ensure complete EMC shielding.

a. EMC: Electromagnetic Compatibility

IFS 125M User Manual Bruker Optik GmbH

4.8 Output port

Figure 4.8: Output port

Description 4

The output port is located on the right side of the spectrometer.

Bruker Optik GmbH IFS 125M User Manual

Description 4

Figure 4.9: Mobile electronics unit

4.9 Mobile electronics unit

The spectrometer is equipped with a mobile electronics unit. This unit is connected to the spectrometer via several cables and consists of different panels.

4.9.1 Panel types

The following table contains the different types of panels. A detailed description of the single panels is given in chapter

Panel type Location on front side of the electronics unit

Flange panel

Table 4.5: Panel types

10.

IFS 125M User Manual Bruker Optik GmbH

Description 4

Panel type Location on front side of the electronics unit

Electronics panel

Power supply panel

Laser panel

Table 4.5: Panel types

Bruker Optik GmbH IFS 125M User Manual

Description 4

Figure 4.10: IFS 125M - Optical path

4.10 Optical path

In standard operation, the parallel input beam is focused by an off-axis-paraboloidal (OAP) mirror onto computer-controlled filter and aperture wheels. After passing the field stop, the input beam is re-collimated onto the beamsplitter.

The optical filter and aperture are selected by the operator to optimize instrumental response for the experimental conditions. After recombining the beam from the two arms of the interferometer, a computer-controlled mirror stage selects between two detectors.

Alternatively, using an optional dichroic filter, the modulated beam can be split to two detectors, thus enabling simultaneous collection from two data channels.

For calibration purposes, a mirror stage allows light from either a globar or tungsten source to pass through a 10 selection between the calibration source and the collimated input is computer controlled.

cm gas cell and then follow the same optical path. The

IFS 125M User Manual Bruker Optik GmbH

5Operation

If the IFS 125M spectrometer has been configured and connected to the PC, you can start acquiring data. The spectrometer is completely software controlled components (e.g. detector) are selected and controlled by using the OPUS software. For details about the software and how to perform a data acquisition refer to the OPUS Ref erence Manual.

This chapter describes the spectrometer-related aspects of operation. For information on software-related aspects (e.g. parameter setting and data acquisition), refer to the OPUS software Reference Manual.

5.1 Operating safety

During operation the spectrometer generates laser radiation and high voltages in some of the electronics.

Objects placed on spectrometer

Objects may fall inside and damage spectrometer components when any of the compartment covers is removed.

➣ Do not place any object on top of the spectrometer.

NOTE

, i.e. the optical

CAUTION

Spectrometer covers removed

Laser and source radiation could be emitted and cause health hazards and property damage. The spectrometer‘s optics may be contaminated.

➣ Always keep the spectrometer covers closed and secured during operation.

1. Except for the beamsplitter.

Bruker Optik GmbH IFS 125M User Manual

Operation 5

5.2 Switching spectrometer on and off

The spectrometer is turned on and off by the main power switch located on mobile electronics unit.

Main power switch Status What is to be done?

On Turn the main power switch in the ON

position.

Off Turn the main power switch in the

OFF position.

Table 5.1: Operating status

After powering up the spectrometer, wait at least 30 minutes before running any

measurements. This allows the electronics and the laser to stabilize.

IFS 125M User Manual Bruker Optik GmbH

5.3 Spectrometer operating phase

How to start? Switch on the spectrometer, using the ON/OFF switch

located on the front side of the mobile electronics unit.

Operation 5

What happens after the spectrometer is switched on?

When is the spectrometer ready-to-operate?

What is to be done if the spectrometer is readyto-operate?

• The spectrometer starts booting. Booting and initializing take about 60 seconds.

• The SR LED (on the front side of the mobile electronics unit) turns red.

• The spectrometer beeps once and starts a self test.

• The SR LED turns from continuous red to sporadic flashing red if the self-test has been successful.

As soon as the red ERR and SR LED (on the front side of the mobile electronics unit) have turned off. The HeNe reference laser needs about 20 minutes to stabilize. The laser is ready, when the green LASER LED stops flashing.

i By default, the scanner initializes automatically as

soon as the LASER LED lights continuously. If the scanner does not initialize automatically see chapter 7.5 Scanner not scanning.

Switch on the computer.

➣ There is no specific order required. You can also

switch on the computer, before switching on the spectrometer.

i For information on how to install the computer and

how to set up signal and power cable connections for the computer, monitor etc. refer to the computer manual.

Table 5.2: Spectrometer operating phase

Bruker Optik GmbH IFS 125M User Manual

Operation 5

5.4 Starting spectroscopy software

If the PC has finished booting, start the OPUS spectroscopy software which has been pre-installed on the PC. How to start OPUS is described in the OPUS Reference Man ual.

5.4.1 Setting up the connection to the optics

1. On the OPUS Measure menu, select the Optic Setup and Service command.

2. Click the Optical Bench tab and select the IFS125 spectrometer type from the Con- figuration drop-down list.

3. Enter correct IP address (see chapter 3.7.1.1).

4. Click the Save Settings button.

➣ OPUS status light at the lower right end of the OPUS interface has to change

from gray to red, yellow or green. If the status light remains gray, see chapter 7.7.

The settings saved remain, unless the IP address of the optics has been changed, or a

different spectrometer type is to be accessed.

IFS 125M User Manual Bruker Optik GmbH

5.5 Inserting accessory into sample compartment

A 10 cm gas cell can be inserted into the sample compartment for calibration purposes.

5.5.1 Inserting procedure

1 • Use a cross-head screwdriver (size: PH2)

and rotate the 4 screws of the top lid coun terclockwise.

➣ You have to rotate over the snap-in resis-

tance. Then, the screw is pushed upwards, and you can loosen it.

• Carefully lift off the sample compartment cover.

Operation 5

2 • Insert the accessory into the sample com-

partment.

•

• Turn the 2 retaining clips by 90° to fix the cell.

• Put on the sample compartment lid again.

• Use the cross-head screwdriver. Push the screws downwards and rotate them clock wise.

Table 5.3: Inserting accessory into the sample compartment

Bruker Optik GmbH IFS 125M User Manual

Operation 5

Figure 5.1: OPUS - Check Signal tab

5.6 Checking the signal

Especially after you have replaced a spectrometer component (source, laser, beamsplitter, detector), it is advisable to check whether a signal is detected, and to check the signal intensity (signal amplitude).

If a liquid nitrogen-cooled detector is used, the detector must be cooled (chapter 5.9) before a signal can be detected.

5.6.1 Procedure

1. Make sure that the spectrometer sample compartment is empty, or contains a gas cell the windows of which are transparent in the spectral range desired.

2. On the OPUS Measure menu, select the Advance Measurement command.

3. Select appropriate measurement parameters.

4. Click the Check Signal tab.

5. Activate the Interferogram option button.

IFS 125M User Manual Bruker Optik GmbH

Definition

A Amplitude value:

Indicates the currently detected signal intensity. The amplitude is proportional to the intensity of the incident IR radiation on the detector. It should not have a short-term deviation of more than 200 ADC counts if the beam is directed onto the thermally stable calibration source.

Long-term deviation (over several hours) can lead to larger deviations in the signal intensity due to variations in the ambient temperature. The signal inten sity should not deviate by more than 20% from the value recorded during the delivery in the installation report.

Position:

The position represents the position (in HeNe fringe zero crossings) of the interferogram maximum. This value must be constant when the OPUS Check Signal mode is selected (as long as the scanner is not stopped or re-initial ized).

Operation 5

If it varies, check whether the spectrometer is subject to extreme vibrations. If there are two interferogram maxima of nearly the same intensity, the position may vary between two values.

B Interferogram

It indicates that a signal is detected.

Table 5.4: OPUS check signal tab

The position value can change any time you power up the spectrometer as the scanner

is always re-initialized during start-up. Thus, after powering up the spectrometer or reinitializing the scanner, select the Advanced Measurement command of OPUS and click the Check Signal tab. Then, click the Save Peak Position button.

To verify the currently detected signal intensity, compare the amplitude value displayed on the Check Signal tab with the amplitude value stated in the supplied test protocol

If there is not any signal detected or if the amplitude value displayed on the Check Signal tab deviates significantly from amplitude value given on the supplied test protocol, check the installation of the spectrometer component(s) you have replaced before.

1. The supplied test protocol documents the result of a factory-performed test. The test has been performed

with the spectrometer being optimally adjusted. You will find the test protocol in the blue folder supplied with the spectrometer.

Bruker Optik GmbH IFS 125M User Manual

Operation 5

5.7 Performing measurement

Before starting any type of measurement, the spectrometer has to be set up properly. Make sure that the HeNe laser is stabilized, the beamsplitter inserted and the detector cooled down (if you use a liquid nitrogen-cooled detector).

5.7.1 Types of measurement

5.7.1.1 Standard measurement using the internal source and the sample compartment

There are two types of measurement to be performed:

• sample measurement

• background measurement

A background measurement is a measurement which uses the empty gas cell or not any sample at all, and is always performed before sample measurement. The purpose of the background measurement is to detect how the ambient conditions, e.g. level of air humidity, temperature etc., and the spectrometer itself have an influence on the spectro scopic measurement result.

After the sample measurement has been completed, OPUS calculates the result sample

spectrum, dividing the sample spectrum (SSC

) by the background spectrum (RSC2). The spectral bands, which result from the ambient conditions and/or the spectrometer, are eliminated from the result sample spectrum.

5.7.1.2 Atmospheric measurement using the input port for collimated beam

This type of measurement performs a sample measurement only. If there are narrow absorption lines on a smoothly varying background, a quasi absorption spectrum can be obtained as follows:

• use the OPUS Spectrum Calculator command to obtain -lg SSC

• use the OPUS Baseline Correction command (interactive mode) to bring the baseline down to zero

5.7.2 Measurement parameters

The measurement parameters are defined on the OPUS Measure menu. Select the Advanced Measurement command and define the parameters on the different tabs. The

standard measuring parameters are provided in appendix

1. SSC: Sample Single Channel, name of the data block added to the OPUS spectrum file

2. RSC: Reference Single Channel, name of the data block added to the OPUS spectrum file

3. Due to the nature of FT spectroscopy, absorbance values >=2 are unreliable and should not be included in any analysis.

IFS 125M User Manual Bruker Optik GmbH

5.7.3 Measuring procedure

1. Start OPUS, the spectroscopy software.

2. Set up the connection between spectrometer and PC.

➣ This step is only required if not yet done.

☞ On the Measure menu, select the Optic Setup and Service command. Click the

Optical Bench tab and select the IFS125 spectrometer type from the Configuration drop-down list. The OPUS status light at the lower right end of the OPUS

interface has to be green or yellow before being able to start measurement.

3. Enter the measuring parameters.

☞ On the Measure menu, select the Advanced Measurement command.

☞ Either load the measuring experiment. On the Basic tab, click the Load button.

The experiments are stored in the <OPUS/xpm directory.

☞ Or set up all measurement parameters manually.

4. Check signal intensity.

☞ Click the Check Signal tab. The Interferogram option button must be activated to

have the interferogram displayed. The interferogram indicates that a signal is detected. The amplitude value displayed above the interferogram shows the signal intensity currently detected.

☞ To check signal intensity compare the amplitude value displayed above the inter-

ferogram with the amplitude value indicated in the test protocol. The supplied test protocol documents the result of a factory-performed test. The test has been performed with the spectrometer being optimally adjusted. You find the test protocol in the folder supplied with the spectrometer.

Operation 5

Especially after switching on the spectrometer, or after a power failure, it is advisable to

check the intensity and position of the interferogram. Click the Save Peak Position but ton once.

5. Measure background spectrum (if applicable).

☞ On the Basic tab, click the Background Single Channel button.

6. Position the sample (if applicable).

7. Start sample measurement.

☞ On the Basic tab, click the Sample Single Channel button.

Detailed information on data acquisition and evaluation are described in the OPUS Reference Manual.

Bruker Optik GmbH IFS 125M User Manual

Operation 5

5.8 Changing beamsplitter

The basic spectrometer configuration is equipped with an MIR beamsplitter, i.e. KBr substrate with multilayer coating. To switch the spectral range the beamsplitter can be changed.

All beamsplitters available for the spectrometer are electronically coded, enabling the spectrometer firmware to auto-detect the beamsplitter type currently installed.

The data about the beamsplitter type are transferred to the spectroscopy software.

Inadequate handling:

Beamsplitter may become useless.

➣ Handle the beamsplitter with utmost care to ensure long service life.

➣ Observe the handling instructions described in chapter 5.8.1.

NOTE

5.8.1 Handling instructions

• Do not touch the beamsplitter surface as the beamsplitter may become useless. Always hold the beamsplitter on the two knobs (A in figure

5.2b). The covers provide mechanical protection, but do not protect

against humidity!

• Do not try to loosen or fasten the screws (B in figure 5.2a) as this will impair the optical quality of the beamsplitter.

• Do not try to clean the beamsplitter. This will definitely damage the beamsplitter irreversibly.

5.2a).

IFS 125M User Manual Bruker Optik GmbH

Operation 5

Figure 5.2a: Beamsplitter

Figure 5.2b: Beamsplitter with protective

cover

CAUTION

5.8.2 Changing procedure

If you change the beamsplitter frequently, purging the spectrometer with dry air or nitro-

gen is highly recommended to reduce the air humidity level inside the spectrometer. Dryair purging considerably reduces the spectrometer down-time after changing the beam splitter.

1 Use a cross-head screwdriver (size PH2) and

2 Carefully lift off the lid.

rotate the 2 screws of the top lid counterclock wise.

➣ You have to rotate over the snap-in resis-

tance. Then, the screw is pushed upwards, and you can loosen it.

Open lid:

Risk of exposure to laser light, which can cause permanent eye damage.

➣ Do not stare into the laser beam.

Bruker Optik GmbH IFS 125M User Manual

Table 5.5: Changing beamsplitter

Operation 5

4 • Hold the beamsplitter - with two hands - on

5 The spectrometer beeps when it detects the new beamsplitter and automati-

cally starts scanning.

• Put on the lid again.

• Use the cross-head screwdriver. Push the screws downwards and rotate them clockwise.

• Check whether a signal is detected, and the optics works properly. More details are described in chapter

• Unlock the release lever, move it further up.

• Hold the beamsplitter - with two hands - on the knobs.

• Carefully remove the beamsplitter straight upwards without catching an edge.

the knobs and insert the new beamsplitter, with the electrical contacts facing to the scanner side. The two guiding pins have to engage into the slots located on the block.

• Push down the beamsplitter completely, until you feel resistance.

• Lock the release lever, move it further down.

5.6.

Table 5.5: Changing beamsplitter

If the beamsplitter has been changed, the peak position changes and must therefore be

saved. Select the Advanced Measurement command of OPUS and click the Check Sig nal tab. Then, click the Save Peak Position button.

If you use VIS and UV beamsplitters, the interferometer has to be realigned by the OPUS Auto Align function as follows:

1. Check signal intensity (chapter 5.6).

2. Once an interferogram is displayed, click the Auto Align button.

➣ If you check Store mode and activated the Spectrum option button, you can

observe the progress visually.

➣ The alignment is most sensitive at high wavenumbers and large apertures. For

example, to align the VIS beamsplitter use a blue or green optical filter and an aperture of 1.85 mm. Make sure that the detector is not overloaded.

➣ Never use the Auto Align function when no (or only a very small) interferogram is

displayed or when working at low wavenumbers. This may lead to severe misalignment.

IFS 125M User Manual Bruker Optik GmbH

5.9 Cooling detector

As the operating temperature of the MCT detector used in the spectrometer is significantly below room temperature, the detector is filled with liquid nitrogen to be able to achieve the required operating temperature.

The MCT detector used inside the spectrometer has to be cooled in regular time intervals.

Hold time of MCT detector: Typically 16 hours

Delivery content of detector: • Funnel

Cooling medium required: • Liquid nitrogen

Operation 5

• Protective dewar plug

• About 1l/filling (16 hours)

Indications of a weakening cooling effect:

Table 5.6: Detector features

• Decreased signal intensity

• No signal at all

• OPUS status light becomes red

• Instrument status message in OPUS reads: Detector not ready.

CAUTION

Improper use of liquid nitrogen:

Can cause frostbites, damage to eye tissue, and asphyxiation.

➣ Avoid any skin contact.

➣ Always wear face shields or safety goggles.

➣ Use liquid nitrogen only in well-ventilated rooms.

➣ Observe the safety instructions described in chapter 5.9.1.

Bruker Optik GmbH IFS 125M User Manual

Operation 5

5.9.1 Safety instructions when working with liquid nitrogen

Avoid spillage of liquid nitrogen:

Rooms need to be well ventilated: • To be able to prevent excessive nitrogen

Avoid skin contact: Due to the extremely low temperature of

Wear face shield or safety goggles:

When spilled on a surface, liquid nitrogen tends to cover the surface completely and cools it immediately.

gas concentrations from being available.

• Excessive nitrogen gas concentrations in the air reduce the concentration of oxygen and can cause asphyxiation.

• Nitrogen gas cannot be detected by human senses.

• As nitrogen gas is odorless there is the risk of being inhaled as if it were normal air.

liquid nitrogen (-196°C), any skin contact can cause severe frostbites.

• The sensitive eye tissue can be damaged if exposed to this cold gas, even if exposed for a short period of time.

• Use only safety goggles with side shields.

Table 5.7: Safety instructions on liquid nitrogen

IFS 125M User Manual Bruker Optik GmbH

5.9.2 Cooling procedure

CAUTION

1 Remove the protective cap from the 2 detec-

2 Insert the supplied funnel into the detector fill-

Operation 5

tor hoods.

ing port and slowly fill in liquid nitrogen. At the beginning the liquid nitrogen will evaporate and escape.

Filling cold nitrogen into warm container:

Nitrogen boils and splashes. Risk of frostbites.

➣ Fill in nitrogen slowly into the container.

➣ Keep away from boiling and splashing

nitrogen, and its escaping gases.

3 • Wait until the funnel is empty before refilling. If the liquid nitrogen does not

escape any more, the dewar has cooled down to the liquid nitrogen tem perature.

• Fill the funnel again with liquid nitrogen. Avoid spilling the liquid on the spectrometer housing.

• Repeat this procedure until the detector dewar has been filled to maximum.

i As a rule of thumb for the standard MCT detector: the maximum dewar

capacity is about the quantity of 3 funnel fillings. Note that the first 3 funnel fillings will evaporate almost completely. Avoid overfilling as the liquid would then flow out of the filling port.

• Remove the funnel and put on the protective cap again.

• Wait about 15 minutes before starting the measurement to allow the detector to stabilize.

• Check whether a signal is detected and the optics works properly. More details are described in chapter

5.6.

Table 5.8: Cooling detector

Bruker Optik GmbH IFS 125M User Manual

Operation 5

NOTE

5.10 Changing detector

The basic spectrometer configuration is equipped with a liquid-nitrogen-cooled MCT detector, mounted on a dovetail guide.

5.10.1 Changing procedure

When changing the detector you have to mind the order described in the following.

Removing covers

1 Removing scanning arm cover:

• Open the clips on each side.

• Put your hand below the clip and push the clip upwards.

• Pull the clip towards you until you feel resistance.

i All the clips have to be in their outermost

Table 5.9: Changing detector - Removing covers

• Two persons are required to lift off the cover

• Put your hands below the hangers.

• Carefully lift off the cover from the scanning

position, otherwise you get problems when lifting off the cover.

of the long scanning arm, one at the front and one at the back end.

arm.

Cover not lift off properly.

Risk of scanner damage.

➣ Lift off the cover straight and far

upwards.

IFS 125M User Manual Bruker Optik GmbH

Operation 5

3 Unscrew the Teflon-made counter nuts from

the 2 detector hoods.

i The Teflon-made counter nuts are only

available if you use a liquid nitrogencooled detector.

5 Use a flat-tip screwdriver to loosen the two

6 Completely remove the trough out of the sam-

• Use a cross-head screwdriver (size: PH2) and rotate the 4 screws of the top lid coun terclockwise.

➣ You have to rotate over the snap-in resis-

tance. Then, the screw is pushed upwards, and you can loosen it.

• Carefully lift off the sample compartment cover.

knurled thumb screws, located on the bottom of the trough.

ple compartment.

7 Repeat step 1 to remove the cover of the detector and interferometer block.

Table 5.9: Changing detector - Removing covers

Bruker Optik GmbH IFS 125M User Manual

Operation 5

NOTE

8 • Put your hands below the flange of the input

Table 5.9: Changing detector - Removing covers

port and the diagonally located hanger.

• Carefully lift off the cover from the detector and interferometer block.

Cover not lift off properly.

Risk of detector, scanner or mirror damage.

➣ Lift off the cover straight and far

upwards.

IFS 125M User Manual Bruker Optik GmbH

Removing detector and inserting new one

1 In case of room-temperature detectors:

Operation 5

remove the shim plate next to the detector. This type of detector does not have a sepa rate preamplifier.

• Gently tilt the detector to the left and right to loosen it from the dovetail guide.

• Carefully pull upwards the preamplifier (A) and the detector (B) simultaneously. Avoid any damage on the mirrors or other compo nents next to the detector.

2 • Insert the new detector and preamplifier

simultaneously.

• Insert the detector precisely into the dovetail guide. Make sure that no cable blocks the optical path.

• Push the detector downwards until it locks into place. The electrical connections are established automatically if the detector has been completely pressed down.

Table 5.10: Changing detector - Removing detector and inserting new one

Bruker Optik GmbH IFS 125M User Manual

Operation 5

3 In case of room-temperature detectors:

• Fasten the shim plate (see marking in figure) to mount the detector.

• Make sure that no cable blocks the optical path.

4 • Switch on the spectrometer.

• Check whether a signal1 is detected and the optics works properly. More details are described in chapter 5.6.

The detector signal may be optimized by slightly adjusting the last parabolic mirror in front of the detector.

Table 5.10: Changing detector - Removing detector and inserting new one

1. If applicable, the detector has to be cooled first.

IFS 125M User Manual Bruker Optik GmbH

Remounting covers

NOTE

1 • Put on the cover of the detector and interferometer block.

• Close the clips on each side.

2 • Insert the trough into of the sample compart-

3 • Use a cross-head screwdriver (size: PH2)

Operation 5

ment.

• Use a flat-tip screwdriver to fasten the two knurled thumb screws, located on the bot tom of the trough.

and rotate the 4 screws of the top lid clock wise.

➣ Press down the screw and rotate it once.

4 • Insert the Teflon-made counter nuts (A).

i The Teflon-made counter nuts are only

available if you use a liquid nitrogencooled detector.

• Put on the protective caps (B).

5 • Two persons are required to put down the

cover of the long scanning arm, one at the front and one at the back end.

• Put your hands below the hangers.

Cover not put down properly.

Risk of scanner damage.

➣ Put down the cover straight and far

downwards.

Bruker Optik GmbH IFS 125M User Manual

Table 5.11: Changing detector - Remounting covers

Operation 5

6 Close the clips on each side.

Table 5.11: Changing detector - Remounting covers

IFS 125M User Manual Bruker Optik GmbH

5.11 Purging the spectrometer

Purging the spectrometer reduces the level of unwanted atmospheric interferents like water vapor and carbon dioxide inside the spectrometer. Especially water vapor in ambi ent air absorbs IR radiation.

Additionally, purging protects humidity-sensitive components (e.g. KBr beamsplitter) from damage. A KBr beamsplitter must not be exposed to humidity.

Spectrometer permanently open:

Water vapor, CO2 and other atmospheric gases cause unwanted absorptions in the infrared spectrum range.

➣ Open the spectrometer only if necessary in order to prevent water vapor or other

gases from entering and adhering to the spectrometer inner walls.

Operation 5

NOTE

When to purge? If the ambient air humidity level inside the spectrome-

ter is too high.

Purge gas: • dry (dew point < -40°C), oil-free and dust-free air

• nitrogen gas

Maximum pressure: 1800 hPa

Sustained gas flow rate: at least 1 l/s

Purging duration: continuously

How to connect purge gas supply line:

Table 5.12: Purging features

see chapter 3.7.3

WARNING

Not using adequate gases for purging:

Some spectrometer components become hot during operation. Risk of fire and/or explosion.

➣ Never use flammable gases for purging.

Bruker Optik GmbH IFS 125M User Manual

Operation 5

IFS 125M User Manual Bruker Optik GmbH

6 Maintenance

The IFS 125M spectrometer is a low-maintenance instrument, i.e. the operator can replace components with a limited service life without requiring the assistance of the Bruker service personnel.

The following maintenance procedures are described in this chapter:

• Checking laser signal

• Replacing source

• Replacing window

• Evacuating detector

• Checking drive cable

• Transporting spectrometer

• Cleaning housing

6.1 General maintenance considerations

Perform only the maintenance procedures described in this chapter. Strictly observe the relevant safety precautions. Any failure to do so may cause property damage or per sonal injury. In this particular case Bruker does not assume any liability.

Maintenance procedures not described in this manual should only be performed by a Bruker service engineer.

The following precautions must be observed to ensure user and property safety:

• Disconnect power supply before performing any maintenance procedures.

• Be careful if the spectrometer covers are removed and the spectrometer is switched on to avoid contact with potentially harmful voltages.

CAUTION

Spectrometer still connected to power supply and covers removed:

Laser and source radiation could be emitted and cause health hazards and property damage.

➣ Always disconnect spectrometer from power supply before starting any mainte-

nance work.

Bruker Optik GmbH IFS 125M User Manual

Maintenance 6

6.1.1 Electrostatic discharge

Electronic components (e.g. semiconductor chips, printed circuit boards) are very susceptible to electrostatic discharges. Even discharge which may not be perceptible to the operator can damage electronic components. Therefore, it is important that the operator is grounded to the spectrometer housing before any electronic component is touched inside the spectrometer.

Electrical grounding can be accomplished by using a grounding wrist strap (not supplied) or touching a grounded object (e.g. radiator). The grounding wrist strap is the most effec tive and preferred grounding method.

6.2 Checking laser signal

To reliably scan and correctly determine the optical path difference it is very important to have proper laser signals at laser A and laser B detectors. The signals should be checked once a month.

6.2.1 Amplitude

The amplitude of the two modulated signals must be in the range between 2 Vpp to

Vpp. In addition, the absolute value of both signals must be in the range +/-10.0 VDC.

Any signal above or below will be distorted or clipped, leading to wrong detection of the laser zero crossings. When severely clipped, two or more zero crossings may be detected and scanning becomes impossible.

IFS 125M User Manual Bruker Optik GmbH

6.2.2 Quick check in OPUS

1 Check the modulated signals in OPUS:

Maintenance 6

☞ On the Measure menu, select the Optics

Diagnostics command.

☞ On the Instrument Status dialog click the

Interferometer icon.

☞ On the dialog shown, click the Service

Info button to open the Scanner diagnos-

tics page.

i Laser A (or B) Amplitude [mV] is the

detected peak-to-peak voltage. Laser A (or B) Offs [mV] is the detected mean (or DC) voltage.

For both laser signals applies the following:

• -10,000 < Offs - Ampl/2 Offs + Ampl/2 <10,000

Ampl >2,000 The values are only determined at the current scanner position, which is usually close to zero path difference.

2 The laser beam must be properly transferred to the two laser detectors. Nor-

mally, there is no re-adjustment required by the user.

3 The laser amplifier has two gain settings,

which are selected by a corresponding bit in the EEPROM of the beamsplitter. This kind of setting can only be accessed via the WEB interface. Details are described in chapter

If the signal amplitude is too small and the low gain is in effect (amplifier off), write the high gain setting permanently into the beamsplitter (and vice versa).

Table 6.1: Quick check in OPUS

8.3.3 Edit hardware configuration.

Bruker Optik GmbH IFS 125M User Manual

Maintenance 6

CAUTION

4 To make the gain setting changes come into

effect you have to reset the controller. Alterna tively, you can re-establish the contact to the beamsplitter by the electronics as follows:

• Carefully lift off the interferometer compartment lid.

Open lid:

Risk of exposure to laser light, which can cause permanent eye damage.

➣ Do not stare into the beam.

• Open the beamsplitter looking door once. This is necessary to make the gain setting changes come into effect.

5 If the signal for one beamsplitter is too low (even with high gain setting) while

the others have good signal, this particular beamsplitter has to be replaced.

Details on changing a beamsplitter are described in chapter 5.8.

6 If the signal is too low for all beamsplitters while the optical alignment is cor-

rect, the laser power itself may have dropped or one of the optical components in the laser beam may have been contaminated. The fiber patch cable could be broken or misaligned. Contact Bruker service.

Table 6.1: Quick check in OPUS

IFS 125M User Manual Bruker Optik GmbH

6.2.3 Signal decrease over optical path

The decrease of the peak-to-peak signal amplitude over the full optical path should be less than 35%.

Maintenance 6

Connect a dual channel oscillographa to the TEST adapter located on the mobile electronics unit.

Pin assignment of TEST adapter:

1 LASA (Laser A) 2 AGND (Ground for 1 + 3) 3 LASB (Laser B) 4 FWDLSW 5 DGND 6 BWDLSW 7 LASXAF 8 DGND 9 SCM+ (Scanner Voice Coil) 10 SCM- (Scanner Voice Coil) 11 DCANA 12 - 16 Spare

➣ Do NOT short-circuit any pins!

2 Connect one end of the laser signal test cable

to the Tes t connector located on the electron ics unit.

3 Connect the other end of the laser signal test cable to the oscillograph.

4 • On the OPUS Measure menu, select the Optic Setup and Service com-

mand.

• Click the Control Panel tabb.

Table 6.2: Signal decrease over optical path

Bruker Optik GmbH IFS 125M User Manual

Maintenance 6

• Scroll to Scanner Control.

• Select Front Short Adjust Mode. Write down the peak-to-peak amplitudes (LASA and LASB) detected on the oscillograph.

• Select Fast Adjust Mode to check the signal amplitude over the full path length.

• Select Back Short Adjust Mode.

• Wait until the scanner commutes around the end position.

• Compare the amplitudes detected on the end position with the amplitudes on the front position. If the amplitude decrease is more than 35%, you have to readjust the laser (see chapter

Table 6.2: Signal decrease over optical path

a. Firmware version June 2012 or later display the laser signal amplitudes (see chapter 6.2.2, step 1) in all

adjust modes, too. Therefore, connecting an oscillograph is not mandatory.

b. Alternatively, you can access the spectrometer by the WEB interface. Details are described in

chapter

8.3.5.

6.2.4).

IFS 125M User Manual Bruker Optik GmbH

6.2.4 Readjusting laser

NOTE

6.2.4.1 Removing covers

1 Removing scanning arm cover:

Maintenance 6

• Open the clips on each side.

• Put your hand below the clip and push the clip upwards.

• Pull the clip towards you until you feel resistance.

i All the clips have to be in their outermost

position, otherwise you get problems when lifting off the cover.

3 Unscrew the Teflon-made counter nuts from

• Two persons are required to lift off the cover of the long scanning arm, one at the front and one at the back end.

• Put your hands below the hangers.

• Carefully lift off the cover from the scanning arm.

Cover not lift off properly.

Risk of scanner damage.

➣ Lift off the cover straight and far

upwards.

the 2 detector hoods.

i The Teflon-made counter nuts are only

available if you use a liquid nitrogencooled detector.

Table 6.3: Readjusting laser - Removing covers

Bruker Optik GmbH IFS 125M User Manual

Maintenance 6

NOTE

CAUTION

4 • Use a cross-head screwdriver (size: PH2)

5 Use a flat-tip screwdriver to loosen the two

and rotate the 4 screws of the top lid coun terclockwise.

➣ You have to rotate over the snap-in resis-

tance. Then, the screw is pushed upwards, and you can loosen it.

• Carefully lift off the sample compartment cover.

knurled thumb screws, located on the bottom of the trough.

6 Completely remove the trough out of the sam-

ple compartment.

7 Repeat step 1 to remove the cover of the detector and interferometer block.

8 • Put your hands below the flange of the input

port and the diagonally located hanger.

• Carefully lift off the cover from the detector and interferometer block.

Cover not lift off properly.

Risk of detector damage.

➣ Lift off the cover straight and far

upwards.

Open lid:

Risk of exposure to laser light, which can cause permanent eye damage.

➣ Do not stare into the laser beam.

Table 6.3: Readjusting laser - Removing covers

IFS 125M User Manual Bruker Optik GmbH

6.2.4.2 Connecting oscillograph to spectrometer

1 Connect one end of the laser signal test cable

to the Tes t connector located on the electron ics unit.

2 Connect the other end of the laser signal test cable to the oscillograph.

3 Use the Direct Control Panel on the spectrometer diagnostics page to move

the scanner. Click Stop Mode and then Back Short Adjust mode.

4 The scanner moves to the outermost position

of the scanning arm.

Maintenance 6

5 • Adjust the laser signal by the two screws on

top of the laser deflection unit.

i The screws are very sensitive. Turn slightly

and do not apply any force to the beamsplitter block. If the screws are too tight, the central locking screw must be loosened a bit.

• Adjust in the way that both laser signals are at a maximum.

• Fix the central locking screw just finger tight. Make sure that both laser signals remain at their maximum.

Table 6.4: Readjusting laser - Connecting oscillograph to spectrometer

Bruker Optik GmbH IFS 125M User Manual

Maintenance 6

Figure 6.1: Beamsplitter area for the laser beam

Figure 6.2a: Adjustment screws of the laser

deflection unit

6.2.5 Phase

The phase between laser A and B signals should be 90 +/- 45°. Check in regular scanning mode (after pressing Reinit Scanner) with a dual channel oscillograph connected to the test adapter.

Make sure that the laser beam passes properly through the lower rectangular area (A in figure

6.1) of the beamsplitter, which is specifically coated for the laser beam.

To slightly adjust the beam height turn all 3 adjustment screws of the laser deflection unit to the same direction. Observe the laser signals on an oscillograph. Maximize the ampli tude as described in chapter 6.2.4.

There is no way to adjust the phase, i.e. if the phase is out of specification, the particular beamsplitter has to be replaced (chapter

5.8).

IFS 125M User Manual Bruker Optik GmbH

6.2.6 Remounting covers

1 • Put your hands below the flange of the input port and the diagonally

located hanger.

• Put on the cover of the detector and interferometer block. ➣ Make sure that the two eyelets at the inner edge of the cover are

catched by the two guiding posts which are located on the console.

• Close the clips on each sidea.

2 • Insert the trough into of the sample compart-

Maintenance 6

ment.

• Use a flat-tip screwdriver to fasten the two knurled thumb screws, located on the bot tom of the trough.

3 • Use a cross-head screwdriver (size: PH2)

and rotate the 4 screws of the top lid clock wise.

➣ Press down the screw and rotate it once.

4 • Insert the Teflon-made counter nuts (A).

i The Teflon-made counter nuts are only

available if you use a liquid nitrogencooled detector.

• Put on the protective caps (B).

Table 6.5: Adjusting laser - Remounting covers

Bruker Optik GmbH IFS 125M User Manual

Maintenance 6

NOTE

5 • Two persons are required to put down the

6 Close the clips on each side.

cover of the long scanning arm, one at the front and one at the back end.

• Put your hands below the hangers.

Cover not put down properly.

Risk of scanner damage.

➣ Put down the cover straight and far

downwards.

Table 6.5: Adjusting laser - Remounting covers

a. If the pretension of any clip is too high or too low, it can be adjusted by turning the metallic screw nut with

a pipe wrench in the appropriate direction.

IFS 125M User Manual Bruker Optik GmbH

6.3 Replacing source

Standard source type: MIR source

Maintenance 6

Where is the source located?

When has the source to be replaced?

How is it indicated that the source is defective?

Tools required: None

Handling instructions: The source becomes hot during spectro-

Has the source to be aligned?

Table 6.6: Source features

6.3.1 Source types

The spectrometer can be equipped with the following source types:

On the rear spectrometer side.

Only if it is defective.

The status light in the lower right end of the OPUS interface becomes red. The error message Source is broken or not connected is displayed.

meter operation. Avoid any skin contact.

All sources used are pre-aligned, and do not have to be aligned after maintenance.

Source type Estimated lifetime

(hours)

MIR source, globar, 12V 9000 Q328/7

NIR/VIS source, tungsten, 12V 9000 Q428/7

Blackbody source, emitting area: 100mm x 100mm

Table 6.7: Source types

Part number

S310

Bruker Optik GmbH IFS 125M User Manual

Maintenance 6

6.3.2 Handling instructions for tungsten source

• Do not touch the tungsten bulb of the NIR source with your fingers as this contaminates the bulb and significantly reduces the service life.

• Wear gloves when changing the bulb and observe the operating instructions indicated on the source packing.

CAUTION

NIR/VIS source operated out of the spectrometer:

Risk of UV radiation.

➣ Do not operate the NIR/VIS source out of the spectrometer.

➣ Operate according to the safety instructions to avoid risk of UV radiation.

IFS 125M User Manual Bruker Optik GmbH

6.3.3 Replacing procedure

CAUTION

NOTE

The replacing procedure is identical for all source types used in the spectrometer.

1 Switch off the source:

Maintenance 6

☞ On the OPUS Measure menu, select the

Optic Setup and Service command.

☞ Click the Control Panel tab.

☞ On the Internal SRC field click OFF.

3 • Loosen the knurled thumb screw (about one

4 • Insert the replacement source into the holder.

Turn the knob on the source housing counterclockwise to remove the screw. Pull off the cover.

Hot source:

Risk of skin burn.

➣ Wait until the light source has cooled

down to room temperature before you replace it.

turn) of the clamping bar.

• Press the source downwards while rotating the clamping bar side.

• Take the source out of the holder.

➣ The globar is very brittle. Do neither knock against nor drop it.

• The two pins of the holder must engage into the holes of the source.

• While pressing the source downwards, rotate the clamping bar over the source.

• Tighten the knurled thumb screw of the clamping bar (about one turn).

5 • Mount the source housing.

• Fasten the knob clockwise.

Table 6.8: Replacing source

Bruker Optik GmbH IFS 125M User Manual

Maintenance 6

WARNING

6 • Click the OPUS status light on the lower

Table 6.8: Replacing source

6.4 Replacing window

right end of the interface to reset the source operating hour meter. The Instrument Status window opens.

• Click the source icon and then the Service Info button. The Source diagnostics page opens.

• Click the Reset button.

• Close the HTML view.

Where are the windows located?

When have the windows to be replaced?

Tools required: Window flange, Allen key

Handling instructions: • Handle with great care as windows are

On the rear and right side of the interferometer cover

In case of too much dirt, cracking and haze

very fragile and easily crack under the influence of mechanical pressure.

• Do not touch the window surface to avoid contaminations which can decrease the infrared transparency.

• Avoid generating dust when the window has been cracked.

• Observe the safety instructions on the window packaging.

Non-observance of safety instructions on packaging:

Serious health problems or even death.

➣ Never clean the windows.

➣ Observe the safety instructions.

Table 6.9: Window features

Window material used: • MIR: KBr

• NIR/VIS/UV: Quartz or CaF

IFS 125M User Manual Bruker Optik GmbH

6.4.1 Window material

CAUTION

NOTE

The following table contains the most important window material which can be used in connection with the spectrometer. For further possible window material, contact Bruker service.

Window material Properties Part number

Maintenance 6

Barium fluoride (BaF2)

Harmful

➣ Observe the safety

data sheet.

Calcium fluoride (CaF2)

Harmful

➣ Observe the safety

data sheet.

Calcium fluoride (CaF2)

Harmful

➣ Observe the safety

data sheet.

49.5 mm diameter F131-17

45 x 3 mm, wedge 6 mrad F162-3

49.5 mm diameter F131-3

Calcium fluoride (CaF2)

90 x 3 mm F165-3/M

Harmful

➣ Observe the safety

data sheet.

Potassium bromide (KBr)

KBr window exposed to moisture:

Property damage.

➣ Avoid any exposure to

moisture.

Table 6.10: Window material

Bruker Optik GmbH IFS 125M User Manual

45 x 5 mm, wedge 6 mrad F162-5-5

Maintenance 6

NOTE

CAUTION

Window material Properties Part number

Potassium bromide (KBr)

KBr window exposed to moisture:

Property damage.

➣ Avoid any exposure to

moisture.

Potassium bromide (KBr)

KBr window exposed to moisture:

Property damage.

➣ Avoid any exposure to

moisture.

Quartz 45 x 2 mm F162-1

Quartz 90 x 3 mm F165-1/M

Zinc selenide (ZnSe)

49.5 mm diameter F131-5

90 x 10 mm F166-5/M

45 x 3 mm, wedge 6 mrad F162-11

Toxic

➣ Observe the safety

data sheet.

Zinc selenide (ZnSe)

Toxic

➣ Observe the safety

data sheet.

Table 6.10: Window material

49.5 mm diameter F131-11

IFS 125M User Manual Bruker Optik GmbH

6.4.2 Replacing procedure

Figure 6.3: Window assembly

1 • Use a hexagon socket setscrew (2mm) to

2 Check whether a signal is detected and the optics works properly. More

details are described in chapter

Table 6.11: Replacing window

Maintenance 6

loosen the screws from the window cap. Rotate the screws counterclockwise.

• Loosen the screws from the fixation ring.

• Replace window as described in chapter

5.6.

6.4.3.

6.4.3 Example of window assembly

Figure 6.3 exemplifies the assembly of a quartz window which consists of the following components:

Bruker Optik GmbH IFS 125M User Manual

Definition

A Window flange

B O-ring for the window flange (A)

Table 6.12: Parts of window assembly

Maintenance 6

Definition

C Window

D Distance ring (only required for thin win-

dow types)

E O-ring for fixation ring (F)

F Fixation ring

G Window port cover

Table 6.12: Parts of window assembly

• Insert the O-ring (B) into the window flange (A).

• Put the window (C) onto the O-ring in the window flange. Always wear gloves.

• Position the distance ring (D), if applicable.

• Position the O-ring (E) into the fixation ring (F).

• Put the fixation ring (F) onto the window assembly.

• Use a hexagon socket setscrew (2 mm) to gradually tighten the screws one after the other.

CAUTION

Damaged window:

Risk of breaking.

➣ Never insert a window which shows signs of damage.

➣ Never insert a window thinner than specified.

IFS 125M User Manual Bruker Optik GmbH

6.5 Evacuating detector

Maintenance 6

Where are the detectors located?

What detector type has to be evacuated?

When has the detector to be evacuated?

How is it indicated that the detector has to be evacu ated?

Tools required: • Turbo molecular pump/oil-free high-vac-

Under the detector hoods

Liquid-nitrogen cooled MCT and InSb detectors

If the detector hold timea considerably decreases (i.e. a hold time of less than 70% of specified hold time).

Most liquid-nitrogen cooled detectors are mounted in re-pumpable vacuum dewars (except for those which are permanently sealed). Usually, the detector dewar holds its vacuum for several months.

• Condensation water exists on the detec-

tor outer surface.

• Outer surface of detector is iced.

• Broad absorption around 3,250 cm-1 (ice band)

uum pump

• Vacuum adapter

More details are described in chapter

Table 6.13: Detector features

a. The hold time indicates how long the cooling effect of the liquid nitrogen lasts.

6.5.1.

Bruker Optik GmbH IFS 125M User Manual

Maintenance 6

A B C D

6.5.1 Evacuating tools required

Too l Definition

Different pump models possible Turbo molecular pump/oil-free high-vac-

uum pump (which achieves an ultimate

vacuum of <10

Adapter

-5

hPa)

Adapter with flexible hose and flange:

• A: adapter

• B: flange

• C: flexible metal hose

• D: NW 25 flange

Table 6.14: Evacuation tools

The evacuating equipment is not included in the delivery scope of the MCT detector. Bruker offers evacuation equipment, and the service of evacuating (Part No: SD128). In the latter you have to send the MCT detector to Bruker.

IFS 125M User Manual Bruker Optik GmbH

6.5.2 Evacuating procedure

closed

open

A B C D E F G H

Figure 6.4: Vacuum adapter, cross section

The following cross-section of the adapter aims to better illustrate the evacuating procedure.

Maintenance 6

A Coupling nut

B O-ring retainer

C O-ring

D Union nut (to remove the valve closure of

E Connecting piece for vacuum pump

F Vacuum adapter

G Washer and O-ring packing

H Knob

Table 6.15: Parts of vacuum adapter

Before evacuating the dewar, the dewar must not contain any more liquid nitrogen. The

dewar temperature must be about room temperature (maximum 60°C).

Evacuating the dewar takes several hours. Therefore, it is recommended to evacuate the dewar over night. The final pressure in the dewar has to be less than 10-5hPa.

Definition

the detector dewar)

Bruker Optik GmbH IFS 125M User Manual

Maintenance 6

1 Turn the main power switch in the OFF posi-

2 Remove the MCT detector from the spectrometer. Detailed information are

given in chapter

3 Connect the connecting piece of the vacuum

4 Pull the knob to the open position.

tion to switch off the spectrometer.

5.10.

adapter to the vacuum pump.

The connecting piece has an outer diameter of 9.7mm.

5 Loosen the coupling nut.

6 Carefully slip the vacuum adapter over the connecting piece of the detector

dewar and fasten the coupling nut finger-tight.

The O-ring must engage properly into the corresponding groove at the detector port. Additional tightening is not necessary

7 Push the knob into the closed position until

the union nut of the vacuum adapter is in con tact with the dewar evacuation valve.

8 • Screw the union nut into the dewar evacua-

tion valve by turning the knob clockwise; 2 to 3 rotations are sufficient. Do not tighten the union nut completely as this would prevent it from being unscrewed later.

• Evacuate the vacuum adapter by using the vacuum pump.

Table 6.16: Evacuating detector

IFS 125M User Manual Bruker Optik GmbH

Maintenance 6

9 Pull the knob to the open position in order to

open the dewar evacuation valve and evacu ate the dewar.

10 • If the desired vacuum has been achieved,

gently push the knob to the closed position in order to close the dewar evacuation valve.

• Purge the section between vacuum pump and vacuum adapter.

11 Rotate the knob several turns counterclock-

wise in order to screw the union nut off the dewar evacuation valve. Be careful not to purge the dewar.

12 Pull the knob to the open position.

13 • Loosen the coupling nut and remove the

vacuum adapter from the connecting piece of the dewar.

• Reinstall the MCT detector into the spectrometer (chapter 5.10)

14 Check whether a signal is detected and the optics works properly. More

details are described in chapter

Table 6.16: Evacuating detector

5.6.

Bruker Optik GmbH IFS 125M User Manual

Maintenance 6

Figure 6.5: Scanner drive cable unit

B C

6.6 Checking drive cable

The drive cable for the moving mirror assembly must occasionally be checked for tension. Especially, when installing a new cable it is recommended to check the cable tension periodically to avoid slipping.

Definition

A Capstan

B Counter screw

C Thumb screw

Table 6.17: Parts of scanner drive cable unit

IFS 125M User Manual Bruker Optik GmbH

6.6.1 Checking procedure

NOTE

1 Removing scanning arm cover:

Maintenance 6

• Open the clips on each side.

• Put your hand below the clip and push the clip upwards.

• Pull the clip towards you until you feel resistance.

i All the clips have to be in their outermost

position, otherwise you get problems when lifting off the cover.

3 There must be no signs of cable slipping at

Table 6.18: Checking drive cable

• Two persons are required to lift off the cover of the long scanning arm, one at the front and one at the back end.

• Put your hands below the hangers.

• Carefully lift off the cover from the scanning arm.

Cover not lift off properly.

Risk of scanner damage.

➣ Lift off the cover straight and far

upwards.

the capstan when the scanner turns at high velocity in long scan mode.

Bruker Optik GmbH IFS 125M User Manual

Maintenance 6

viewpoint

second tool

6.6.2 Adjusting procedure

1 Loosen the counter nut. Use a tool and turn it

2 • Adjust the drive cable tension by the thumb

counterclockwise.

screw.

• Turn the thumb screw counterclockwise to increase the tension.

• Be careful not to overtighten the thumb screw to prevent the cable from tearing.

3 • Fix the tension by the counter nut.

• You may hold the screw in place by a second tool.

4 Remount the cover onto the scanning arm.

Table 6.19: Adjusting drive cable

IFS 125M User Manual Bruker Optik GmbH

6.7 Transporting spectrometer

NOTE

When transporting the spectrometer you have to fix the scanner on the scanning arm, remove the beamsplitter and demount the complete scanning arm. Mind the order described in the following chapters.

Moving the spectrometer within a building can be done without demounting the scanning

arm.

6.7.1 Removing covers

1 Removing scanning arm cover:

• Open the clips on each side.

• Put your hand below the clip and push the clip upwards.

• Pull the clip towards you until you feel resistance.

Maintenance 6

i All the clips have to be in their outermost

position, otherwise you get problems when lifting off the cover.

2 • Two persons are required to lift off the cover

of the long scanning arm, one at the front and one at the back end.

• Put your hands below the hangers.

• Carefully lift off the cover from the scanning arm.

Cover not lift off properly.

Risk of scanner damage.

➣ Lift off the cover straight and far

upwards.

Table 6.20: Transporting spectrometer - Removing cover from scanning arm

Bruker Optik GmbH IFS 125M User Manual

Maintenance 6

3 Unscrew the Teflon-made counter nuts from

the 2 detector hoods.

i The Teflon-made counter nuts are only

available if you use a liquid nitrogencooled detector.

5 Use a flat-tip screwdriver to loosen the two

6 Completely remove the trough out of the sam-

• Use a cross-head screwdriver (size: PH2) and rotate the 4 screws of the top lid coun terclockwise.

➣ You have to rotate over the snap-in resis-

tance. Then, the screw is pushed upwards, and you can loosen it.

• Carefully lift off the sample compartment cover.

knurled thumb screws, located on the bottom of the trough.

ple compartment.

7 Repeat step 1 to remove the cover of the detector and interferometer block.

Table 6.20: Transporting spectrometer - Removing cover from scanning arm

IFS 125M User Manual Bruker Optik GmbH

8 • Put your hands below the flange of the input

NOTE

Table 6.20: Transporting spectrometer - Removing cover from scanning arm

6.7.2 Moving and fixing scanner

Maintenance 6

port and the diagonally located hanger.

• Carefully lift off the cover from the detector and interferometer block.

Cover not lift off properly.

Risk of detector damage.

➣ Lift off the cover straight and far

upwards.

1 • Manually move the scanner from its initial

position to the end of the scanning arm.

➣There is a high friction when moving the

scanner.

• Alternatively, use the Direct Control Panel command on the spectrometer diagnostics page to move the scanner. Click Stop Mode and then Back Short Adjust Mode.

➣ Once the scanner has reached the back

position, click Stop Mode.

• Do not touch the scanner on the red-colored surfaces (top side or spring leaves).

• Hold the scanner either at the side edges (see arrow), or at the back.

Table 6.21: Transporting spectrometer - Moving and fixing scanner

Bruker Optik GmbH IFS 125M User Manual

Maintenance 6

2 Loosen the fixing screw counterclockwise to

3 Rotate the fixing screw clockwise into the fix-

remove it from its stand-by position.

ture on the scanner.

4 When the screw is fixed, the outer scanner

cannot be moved any more.

5 To fix the inner scanner use the supplied

clamp.

➣ To position the clamp make sure that the

clamp screws fit into the boreholes (see arrow), located on the inner scanner housing.

➣ Fasten the clamp screws (see arrows).

Pay attention, as the clamp touches the top side of the movable structure, but does not press it down! This avoids defor mation of the spring leaves.

Table 6.21: Transporting spectrometer - Moving and fixing scanner

IFS 125M User Manual Bruker Optik GmbH

Maintenance 6

6 To fix the small retaining clip of the clamp

make sure that the clip is exactly positioned below the boreholes (see arrow), located on clamp.

➣ The top of the scanner and the clamp

must be in touch, or must have a very small gap in between.

Fasten the clip screws.

Table 6.21: Transporting spectrometer - Moving and fixing scanner

6.7.3 Removing beamsplitter

Remove the beamsplitter to prevent it from breaking while demounting the scanning arm, or during transport.

1 Turn the main power switch in the OFF posi-

2 • Unlock the release lever, move it further up.

Table 6.22: Transporting spectrometer - Removing beamsplitter

The handling instructions are described in chapter 5.8.1.

tion to switch off the spectrometer.

• Hold the beamsplitter - with two hands - on the knobs.

• Carefully remove the beamsplitter straight upwards without catching an edge.

Bruker Optik GmbH IFS 125M User Manual

Maintenance 6

6.7.4 Removing optical fiber cable

1 Turn the main power switch in the OFF posi-

2 • Carefully rotate the knurled screw head of

tion to switch off the spectrometer.

the fiber plug counterclockwise to loosen it from the collimator lens.

• Gently pull the plug (by slightly rotating it) to remove the plug.

➣ Never pull the fiber cable as the fiber

core may break easily. Avoid any kind of force.

• Put a protective cover over the ferrule at the fiber end.

3 Open the cable support. Put the fixture

upwards.

4 Pull out the optical fiber cable end.

➣ Avoid any kind of force.

Loosen the lock nut of the fiber cable fixture, located on laser panel of the mobile electron ics unit.

100

Table 6.23: Transporting spectrometer - Removing optical fiber cable

IFS 125M User Manual Bruker Optik GmbH

Bruker IFS 125M User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Table of Contents

1 Introduction

1.1 About this manual

1.2 Terms

1.3 Safety

1.3.1 Warning labels

1.3.2 Waste disposal

1.4 General information

1.4.1 Protective earthing

1.4.2 Qualified personnel

1.4.3 Intended use

1.5 Questions and concerns

2 General

2.1 Design

2.2 Optics

2.3 Electronics

2.4 Data acquisition

3 Installation

3.1 Delivery contents

3.2 Packaging

3.3 Transportation

3.4 Site requirements

3.5 Connection ports

3.6 Connecting procedures

3.6.1 Connecting cables to the mobile electronics unit

3.6.2 Overview on cables connected

3.7 Connecting spectrometer to power supply

3.7.1 Connecting spectrometer to a PC

3.7.2 Connecting accessories via CAN bus

3.7.3 Connecting spectrometer to purge gas supply line

3.8 Inserting beamsplitter

3.8.1 Handling instructions

3.8.2 Inserting procedure

4 Description

4.1 Spectrometer front side

4.2 Spectrometer rear side

4.3 Sample compartment

4.4 Beamsplitter lid

4.4.1 Beamsplitter types

4.5 Detector hoods

4.5.1 Detector types

4.6 Scanner compartment

4.7 Input ports

4.8 Output port

4.9 Mobile electronics unit

4.9.1 Panel types

4.10 Optical path

5Operation

5.1 Operating safety

5.2 Switching spectrometer on and off

5.3 Spectrometer operating phase

5.4 Starting spectroscopy software

5.4.1 Setting up the connection to the optics

5.5 Inserting accessory into sample compartment

5.5.1 Inserting procedure

5.6 Checking the signal

5.6.1 Procedure

5.7 Performing measurement

5.7.1 Types of measurement

5.7.2 Measurement parameters

5.7.3 Measuring procedure

5.8 Changing beamsplitter

5.8.1 Handling instructions

5.8.2 Changing procedure

5.9 Cooling detector

5.9.1 Safety instructions when working with liquid nitrogen

5.9.2 Cooling procedure

5.10 Changing detector

5.10.1 Changing procedure

5.11 Purging the spectrometer

6 Maintenance

6.1 General maintenance considerations

6.1.1 Electrostatic discharge

6.2 Checking laser signal

6.2.1 Amplitude

6.2.2 Quick check in OPUS