YOKOGAWA NR800L User manual

User’s
Manual NR800L
Fourier Transform Near-Infrared
Analyzer, Desktop Type
IM 12Y03C00-01E
IM 12Y03C00-01E
8th Edition

i
IM 12Y03C00-01E
Notices
nRegarding This Manual
• This manual should be passed on to the end user.
• Read this manual carefully to fully understand how to operate this product before you start
operation.
• This manual is intended to explain the functions of this product. Yokogawa Electric
Corporation (hereinafter simply referred to as Yokogawa) does not warrant that the functions
will suit a particular purpose of the user.
• All rights reserved. No part of this document may be reproduced in any form without
Yokogawa’s written permission.
• The contents of this manual are subject to change without prior notice.
• If any question arises or errors are found, or if any information is missing from this manual,
please inform the nearest Yokogawa sales o󰀩ce.
nRegarding Protection, Safety, and Prohibition Against Anauthorized
Modication
• For the protection and safe use of the product and the system controlled by it, be sure to
follow the instructions on safety described in this manual when handling the product.
• If protection/safety circuits are to be used with the product or the system controlled by it,
they should be installed outside of the product.
• The user is responsible for ensuring that – when performing maintenance or installing safety
circuitry for this equipment or any ancillary control systems – external safety or protective
circuitry required by relevant electrical/safety regulations, laws, and standards in the country
of use – is installed and satises the requirements. Do not modify or add parts to the internal
circuitry.
• When replacing parts or consumables, be sure to use Yokogawa-recommended parts.
• Do not modify this equipment without permission.
nRegarding Force Majeure
• Yokogawa makes no warranties regarding the product except those mentioned in the
WARRANTY that is provided separately.
• In cases where the use of this product results in damage or loss to the user or a third party,
Yokogawa will not be responsible for any incidental or consequential damage or loss, or any
damage or loss su󰀨ered by the user or third party resulting from a defect or defects in this
product which could not be foreseen by Yokogawa.
8th Edition : Jan. 27, 2023-00
No. IM 12Y03C00-01E 8th Edition : Jan. 2023 (YK)
All Rights Reserved Copyright © 2003, Yokogawa Electric Corporation

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IM 12Y03C00-01E
nThe following symbol marks are used in this manual:
WARNING
This symbol indicates that the operator must follow the instructions laid out in this manual in order
to avoid the risk of injury to personnel, electric shock, or fatalities. The manual describes what
special care the operator must exercise to avoid such risks.
"Danger" notes are aimed at preventing injury or death, and "Warning" notes are aimed at
avoiding damage to equipment.
CAUTION
This symbol indicates that the operator must refer to the instructions in this manual in order to
prevent the instrument (hardware) or software from being damaged, or a system failure from
occurring.
CAUTION
This symbol draws attention to information essential for understanding the operation and
functions.
NOTE
This symbol gives information that complements the present topic.
Electrical Shock
High temperature
Laser-generating system
nCompliant Standard
This instrument is a Class A product, and is designed for use in an industrial environment. Please
use this instrument in an industrial environment only.
(1) Safety
CSA: C22.2 No.61010-1
Installation category (Overvoltage category) II *
Pollution Degree 2 **
*: Describes a number which denes a transient overvoltage condition. It implies the regulation for impulse withstand voltage. “II”
applies to electrical equipment which is supplied from xed installations like distribution boards.
**: Describes the degree to a solid, liquid, or gas which deteriorates dielectric strength or surface resistivity is adhering. “2” applies to
normal indoor atmosphere.
Normally, only non-conductive pollution occurs.
(2) EMC directive
Korea Electromagnetic Conformity Standard
RCM Mark
EN 61326-1 Class A (For use in industrial locations)
nPrecautions Against Electrostatic Damage
When handling cards with IC components mounted on them for maintenance or setting changes,
take full precautions against electrostatic problems.
• When storing or carrying cards, enclose them in a conductive bag or antistatic bag. (Cards
as shipped by Yokogawa are enclosed in a conductive bag or antistatic bag labelled with
cautions against electrostatic problems.)
8th Edition : Jan. 27, 2023-00

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IM 12Y03C00-01E
• When servicing cards, wear a wrist strap grounded via a 1 MΩ resistance. Connect the wrist
strap to a ground terminal.
• When servicing cards on the bench, wear a wrist strap and place them on a conductive
sheet grounded via a 1 MΩ resistance. Keep easily-chargeable plastic materials away from
the bench.
• Never touch components mounted on the cards, the pattern side, connectors, pin compo-
nents, etc. with bare hands, unless using a wrist strap and a conductive sheet.
F01.ai
Wrist strap
1MΩ
Wrist strap
Conductive Sheet
1 MΩresistance
1MΩ
Example of wrist strap and conductive sheet
nPower cord and fuses
Do not attempt to use power cords and fuses for any products except those supplied by
Yokogawa.
nGeneral Precautions
• This Fourier-transform near-infrared spectrometer, depending on specications, may come
with process samples, standard samples and “utility” materials. These samples or materials
may be ammable, combustible, poisonous, obnoxious smell, strong solvents, polymeriz-
ing, or corrosive. Please take adequate precautions.
• The NR800L analyzer weighs approximately 30 kg, and its center of gravity is positioned in
the center of its shape. When transporting or installing the NR800L, including during piping
or wiring work, take adequate precautions. Ideally use the NR800L by at least four people
when moving it.
To avoid to damage to spectral apparatus, it should not be overturned during lifting up and
carrying the analyzer.
•The NR800L is a precision instrument. Handle it with care not so as to receive mechanical
shock. Before moving this instrument, x the spectrometer, its inside mirror and Laser. Inx-
ing them, use protective cushions attached in shipping.
• Operate this unit within specications, otherwise we shall not accept the responsibility for
use out of specication. All repairs and modications should be performed by YOKOGAWA.
•Read the user’s manual before operating the NR800L.
•Strictly follow this user’s manual when installing and operating this equipment.
• For cleaning of analyzer, do not use any abrasives or organic solvent.
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Precautions in Handling Laser-based Products
The instrument is classied as laser product of Class 1 according to IEC 60825-1.
In addition, in the U.S.A., the product complies with 21 CFR 1040.10 and 1040.11 except for
deviations pursuant to Laser Notice No. 50, dated June 24, 2007.
Note the following and observe the given precautions when handling the unit:
lType of the Incorporated Laser Unit
The following laser unit is incorporated within the spectrometer in the embedded laser product.
• Helium-neon gas laser head
- Classication of laser product : Class 3R
- Maximum power (CW) : < 4 mW
- Wavelength : 632.8 nm
- Beam divergence : 1.7 mrad
lHandling Precautions
• Do not remove the spectrometer cover for reasons other than parts replacement.
• For safety reasons, if you replace parts, always turn the power o󰀨 before removing the
spectrometer cover.
NOTE
The Helium-Neon Laser also stops operating even if you remove the spectrometer cover with the
power switched on.
WARNING
Controlling and adjusting the unit for emitting laser beams using procedures other than those
specied in this manual may result in hazardous exposure to laser radiation.
8th Edition : Jan. 27, 2023-00

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IM 12Y03C00-01E
lLabeling
The following labels are placed on the analyzer.
Modified statement label of compliance with the IEC 60825-1:2007
Nameplate for NR801EL
(1)
(2)
(3)
(4)
(5)
(6) (7)
Rear view
Label for KC (Korea Certification)
mark and RCM (Regulatory
Compliance Mark)
China RoHS Label
(Electronic Information
Products Pollution
Control Logo)
Warning (hazard symbol for laser
radiation) and explanatory label
No. Text Remarks
(1) Model and su󰀩x codes With additional code
(2) Latest style number Product carrier code
(3) 100, 115, 200, 230 Depends on power specications (1 to 6)
(4) Maximum rated power
(5) Serial number Format : 9 digit alpha-numerals
(6) The month and year of manufacture Format : 20YY-MM, YY and MM are a numerial of 2 digits
(7) Engineering number Format : IS8-XXXX, XXXX is a numeral of 4 digits
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IM 12Y03C00-01E
Cautions for Safety which apply to the Instrument
To avoid electrical shock, risks of death or injury to personal and hardware damage, the following
instruction must be followed.
WARNING
• Electric Power
Please conrm that the instrument spec of electric power meet to electric supply before turn
the power on.
• Power Cord and Plug
To avoid electrical shock and re, use be power cord which is supplied from Yokogawa. The
plug of 3 pin power code must be connected to 3 pronged receptacle which has grounding
terminal. The protective function will no work if extension cable which has no ground wire is
used.
• Protective grounding
To avoid electrical shock, please provide protective grounding, by using 3 pin power code
(3rd wire is for grounding) which is provided with the instrument. The protective function will
not work if the 3 pin/2 pin adapter and/or 2 pin cable is used.
• Importance of Protective grounding
Please do not cut or remove the grounding wire or terminal. It will be occurred that
dangerous situation i.e. electrical shock and hardware damage.
• Fault of Protective Function
If in case the fault situation of protective grounding or defect of fuse is excepted, please
do not operate the instrument. Please conrm the protective function has not fault before
operation.
• Fuse
To avoid the re, please use specied rating fuse (Ampere, Voltage, Type.) Please replace
the fuse after power switch o󰀨 and power code is pull o󰀨. Do not make short-circuit of the
fuse holder.
• Explosive Gas
Do not operate the instrument under the ammable and combustible gas environment. It is
very dangerous.
• Remove Cover
Do not remove the cover. It should be opened by Yokogawa’s qualied personal. It has the
risk of Electrical shock by high voltage.
• Wiring Connection
Please make sure the grounding wiring is connected. After it, make external wiring
connection.
It need to touch the circuit instrument power must be cut o󰀨 and conrm that no voltage is
applied inside.
• Handling of Instrument
Do not make rough handling or vibration. Internal spectral apparatus and optical ber may
damaged.
• High Pressure Gas Sample
It is very dangerous to handle the high pressure gas sample which is over 980 kPa or equal.
Please handle it carefully. In case certain regulation in certain countries, it is required the
handling manager need to be assigned depending on the usage and type of gas.
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IM 12Y03C00-01E
After-sales Warranty
■ Yokogawa warrants the product for the period stated in the quotation which was delivered
before purchase. Yokogawa shall conduct dened warranty service based on its standard.
When the customer site is located outside of the specied service area, a fee for dispatching
the maintenance engineer will be charged to the customer.
■ In the following cases, customer will be charged a repair fee regardless of warranty period.
• Failure of components which are out of scope of warranty stated in instruction manual.
• Failure caused by usage of software, hardware or auxiliary equipment, which Yokogawa did
not supply.
• Failure due to improper or insu󰀩cient maintenance by user.
• Failure due to modication, misuse or outside-of-specications operation which Yokogawa
does not authorize.
• Failure due to power supply (voltage, frequency) being outside specications or abnormal.
• Failure caused by any usage out of scope of recommended usage.
• Any damage from re, earthquake, storms or oods, lightning, disturbances, riots, warfare,
radiation and other natural changes.
■ Yokogawa does not warrant conformance with the specic application at the user site.
Yokogawa will not bear direct/indirect responsibility for damage due to a specic application.
■ Yokogawa Electric will not bear responsibility when the user congures the product into
systems or resells the product.
■ Maintenance service and supplying of repair parts will be covered for ve years after the
production ends. For repairs to this product, please contact the nearest sales o󰀩ce de-
scribed in this user’s manual.
nTrademark Acknowledgments
• SPECTLAND and InfraSpec are either trademarks of Yokogawa Electric Corporation.
• Microsoft, Windows, Windows XP, Windows Vista and Windows 7 are either registered
trademarks or trademarks of Microsoft Corporation in the United States and/or other
countries.
• Ethernet is a registered trademark of XEROX Corporation.
• All other company and product names mentioned in this user’s manual are trademarks or
registered trademarks of their respective companies.
• We do not use TM or ® mark to indicate those trademarks or registered trademarks in this
user’s manual.
8th Edition : Jan. 27, 2023-00

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1
IM 12Y03C00-01E
NR800L
Fourier Transform Near-Infrared Analyzer, Desktop Type
8th Edition : Jan. 27, 2023-00
CONTENTS
IM 12Y03C00-01E 8th Edition
Notices ......................................................................................................................i
Precautions in Handling Laser-based Products ................................................iv
Cautions for Safety which apply to the Instrument............................................vi
After-sales Warranty .............................................................................................vii
1. Introduction............................................................................................... 1-1
2. ComponentsandSystemCongurations............................................. 2-1
2.1 SystemConguration ...................................................................................... 2-1
2.2 NR800L Analyzer............................................................................................... 2-1
2.3 Personal Computer........................................................................................... 2-2
2.4 Optical Fiber Cable ........................................................................................... 2-3
2.5 Accessories....................................................................................................... 2-3
3. Installation, Piping and Wiring................................................................ 3-1
3.1 NR800L Analyzer Installation........................................................................... 3-1
3.1.1 Installation Conditions and Utilities .................................................... 3-1
3.1.2 Space for Maintenance...................................................................... 3-2
3.1.3 Installation .......................................................................................... 3-2
3.1.4 Removal of Protective Cushions used in Shipping............................ 3-3
3.2 Wiring and Piping.............................................................................................. 3-4
3.2.1 Power Supply Wiring.......................................................................... 3-4
3.2.2 Optical Fiber Wiring in using single core cables ................................ 3-5
3.2.3 Optical ber wiring in using a two-core cable .................................... 3-6
3.2.4 Wiring of Ethernet Communication Cable (10Base-T) ...................... 3-7
3.3 Power ON procedure ........................................................................................ 3-8
3.3.1 Check Items before power on............................................................ 3-8
3.3.2 Power ON procedure of NR800L analyzer ........................................ 3-8
3.4 Laying Optical Cable ........................................................................................ 3-8
3.4.1 NR821 or NR822 Silica ber cable .................................................... 3-9
3.4.2 NR823 or NR824 Fluoride ber cable ............................................. 3-12
3.5 Ethernet Connection to Management Personal Computer........................ 3-13
3.5.1 Specications of Ethernet Interface................................................. 3-13
3.5.2 Ethernet Interface Connection......................................................... 3-14
3.5.3 Ethernet Interface Settings .............................................................. 3-15
3.5.4 Setting of Ethernet Parameter ......................................................... 3-15

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IM 12Y03C00-01E 8th Edition : Jan. 27, 2023-00
3.5.5 Checking Ethernet Interface Connection Status ............................. 3-17
4. Alarms........................................................................................................ 4-1
4.1 Alarm Types....................................................................................................... 4-1
4.2 Alarm Details ..................................................................................................... 4-1
5. Maintenance and Inspection................................................................... 5-1
5.1 Maintenance ...................................................................................................... 5-1
5.2 Replacing Parts................................................................................................. 5-1
5.2.1 Replacing the Lamp........................................................................... 5-2
5.2.2 Replacing the Laser........................................................................... 5-3
5.2.3 Replacing the Laser Fuse.................................................................. 5-4
5.2.4 Replacing the Spectrometer Desiccants ........................................... 5-4
5.3. Parts for Maintenance ...................................................................................... 5-5
6. Measuring Principles ............................................................................... 6-1
7. Troubleshooting ....................................................................................... 7-1
7.1 Lighting of Alarm Lamps.................................................................................. 7-1
7.2 Abnormal Analyzed Value................................................................................ 7-1
7.3 Not communicating of between PC and NR800L .......................................... 7-2
Customer Maintenance Parts List......................................CMPL 12Y03C00-01E
Revision Record.......................................................................................................i

<1. Introduction> 1-1
IM 12Y03C00-01E
1. Introduction
Thank you for buying our InfraSpecTM NR800L Fourier-Transform Near-Infrared Spectrometer.
This manual describes its installation, its maintenance, and operating cautions. Be sure to read
this manual carefully before using this spectrometer. “NR800L” in this manual means Model
NR801EL. For the overview of NR800 Fourier-Transform Near-Infrared Spectrometer, refer to
GS 12Y03C00-01E.
An exclusive User’s Manual might be attached to the products whose su󰀩x codes or option
codes contain the code “Z” (made to customers’ specications). Please read it along with this
manual.
For the use of the SPECTLANDTM2 operation management software for spectrographic
measurement, refer to the separate IM12Y03B01-11E.
Use only the supplied accessories in any case, otherwise malfunctions and damages on
operation or maintenance may happen.
The information in handling this product are given, in this manual, with a symbol mark and a
word such as “WARNING”. The symbol mark and word is di󰀨erent, depending on the extent
of importance. For human safety and prevention of instrument damage, strictly observe and
comply with every safety caution and warning shown in this manual. CAUTION or WARNING
labels are also on the product itself. They are indicated with the ALERT symbol such as the below
examples.
— Examples of a the ALERT symbol —
WARNING
Electrical Shock Laser-generating system
The analyzer is very dangerous (possibly resulting in serious injury or death) because a high
voltage is always applied to it, and because a laser-generating device is incorporated. Before
the analyzer cover is opened for maintenance purposes, be sure to turn o󰀨 the power to the
instrument.
• Do not open the cover.
Refer servicing to Yokogawa service personnel.
High voltage is presented on the inside parts.
If contacted, produce electric shock.
Turn o󰀨 the power before opening the cover.
• The cover is xed by the screws. It should be tightened by the tool after maintenance.
CAUTION
Before starting measurement, take a warm-up time if the instrument is not power supplied.
Especially if it is very cold in starting up the instrument for the rst time, or after it has been
stopped for a long time, take adequate warm-up time; more than 6 hours should be taken.
8th Edition : Jan. 27, 2023-00

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<2. Components and System Congurations> 2-1
IM 12Y03C00-01E
2. Components and System
Congurations
For the correct use of the InfraSpec spectrometer, this chapter explains a typical system
conguration and its components or unit. Be sure to read before installation. For the specication
of each component, refer to GS 12Y03C00-01E.
2.1 SystemConguration
A typical system conguration is shown in the Figure 2.1.
In this diagram, three optical ber are used.
Optical Fiber
Ethernet
(10Base-T)
Meas-
uring
Cell
InfraSpec
NR800L
Analyzer
Maintenance
PC
Optical
Fiber
Optical Fiber F0201.ai
Figure2.1 NR800LSystemCongurationDiagram
2.2 NR800L Analyzer
The names of external and internal key components of the NR800L are shown in Figures 2.2 to
Figure 2.4.
NR800
LIGHT OUT
REF SMPL
LIGHT IN
SMPL REF
FOURIER TRANSFORM NEAR INFRARED ANALYZER
Infra Spec
Power/Alarm
Indicator
Optical Fiber
Connector (OUT)
Optical Fiber
Connector (IN)
POWER (G)
ALARM (R)
F0202.ai
Figure 2.2 NR800L front side view
Power Switch
Ethernet
(10Base-T)
Connector
Power Connector
and Fuse
Grounding terminal F0203.ai
Figure 2.3 NR800L rear view
8th Edition : Jan. 27, 2023-00

<2. Components and System Congurations>
2-2
IM 12Y03C00-01E
Spectrometer Inner Fiber Cable DC Power supply
Beam Connector Beam Splitter Fan Card cage PD unit
D-SUB 9-pin connector
(MAIN card)
Ethernet communication indicator
(Ethernet card) F0204.ai
Figure 2.4 NR800L internal view (Top View)
2.3 Personal Computer
Connect the InfraSpec NR800L to a Personal Computer, set parameters and measure spectra,
and download calibration models.
The SPECTLAND2 software requires the following condition to run:
(1) Personal computer
Model IBM PC/AT compatible, desktop type
Operating system (OS) Microsoft Windows 10 Professinal 64bit
CPU Intel Core i5 or higher
RAM 8 GB or more
Hard disk space 10 GB (for program) and 25 GB (for data strage) or more
Ethernet adapter 10 Base-T
Display SVGA mode (1024 x 768 pixels or more)
Others CD-R drive is recommended
(2) Printer (for color printing)
(3) Cabling for connecting to other instruments
8th Edition : Jan. 27, 2023-00

<2. Components and System Congurations> 2-3
IM 12Y03C00-01E
2.4 Optical Fiber Cable
Two types of optical ber cable, which can interconnect NR800L and measurement cell, are
available. Select one type for your preference.
(1) Flexible Fiber Cable (single core) : Three cables are necessary
(2) Flexible metal-sheathed cable (dual core)
2.5 Accessories
(1) Power cord
Power cord will be supplied in accordance with specications on documents proposed by
YOKOGAWA.
(2) Fuse
* For main power supply 2 pieces
P/N:A1113EF (250 VAC 3.15A)
* For laser power supply 2 pieces
P/N:A1108EF (0.5A Time-lag) for 110 or 115 VAC
P/N:A1107EF (0.3A Time-lag) for 200 or 230 VAC
(3) Model code:NR8SP01-04 Lamp assembly 1 unit
CAUTION
Do not use a power cord and fuse for the other equipment.
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<3. Installation, Piping and Wiring> 3-1
IM 12Y03C00-01E
3. Installation, Piping and Wiring
3.1 NR800L Analyzer Installation
3.1.1 Installation Conditions and Utilities
Install the NR800L in a location that meets the following conditions.
Table 3.1 Normal Operating Conditions
Location Non-hazardous location, indoors(nonexplosive atmosphere),
where the analyzer shall not be exposed to weather, sunlight, or radiant heat.
Ambient temperature 0 to 35°C
Ambient humidity 0% to 80% RH (no condensation)
Vibration Minimum vibration (vibration acceleration of 2 m/s2or less).
Atmosphere Minimum dust and no corrosive or toxic substances.
Altitude Up to 2000 m above sea level.
Shock Not acceptable
lWell-ventilated location
To prevent overheating, install the NR800L in a well-ventilated location. Keep a clearance of 50
mm or greater around the right, left and top surfaces of the NR800L.
lMinimal mechanical vibration (Refer to Figure 3.1)
Choose an installation location with minimal mechanical vibration.
lHorizontal
Install the NR800L horizontally.
NOTE
Condensation may occur if the NR800L is moved to another place where both the ambient
temperature and humidity are higher, or where the temperature changes rapidly. In this case, let
the NR800L adjust to the new environment for at least six hours before use.
Do not install the NR800L in the following places (avoid such locations):
lIn direct sunlight or near heat sources
Install the NR800L in a place near room temperature (23°C) and with small temperature
uctuations. Placing the NR800L in direct sunlight or near heat sources can damage the
instrument.
lWhere an excessive amount of soot, steam, moisture, dust, or corrosive gases
are present:
Soot, steam, moisture, dust, and corrosive gases may damage the NR800L.
lNearstrongmagneticeldsources
Do not bring magnets or instruments that produce electromagnetic elds close to the NR800L.
Operating the NR800L in strong magnetic elds can cause measurement errors.
8th Edition : Jan. 27, 2023-00

<3. Installation, Piping and Wiring>
3-2
IM 12Y03C00-01E
Use the appropriate power supply (details depend on Model and su󰀩x codes)
Table 3.2 NR800L analyzer
Item Specications
Power supply voltage 100, 115, 200, or 230 V AC,single phase, 50/60 Hz *
Voltage uctuation Rating 10 %, 50/60 ±2 Hz
Power consumption Approx. 200 VA
* : To be specied for ordering. For details, refer to “Model and Su󰀩x Codes.”
3.1.2 Space for Maintenance
When installing the analyzer, keep space around it 2 to facilitate operation and maintenance 2, –
as illustrated in Fig. 3.1.
50 550 50
50
400
350
650
800
NR800L
Maintenance space
Unit : mm
F0301.ai
Figure 3.1 Maintenance space for NR800L analyzer
3.1.3 Installation
Fig. 3.2 shows an external view of the NR800L Analyzer. Mount it as horizontally as possible.
NR800
LIGHT OUT
REF SMPL
LIGHT IN
SMPL REF
FOURIER TRANSFORM NEAR INFRARED ANALYZER
Infra Spec
16390
400
10 220
550
ALARM (R)
POWER (G)
Unit : mm
F0302.ai
Figure 3.2 External view of NR800L
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<3. Installation, Piping and Wiring> 3-3
IM 12Y03C00-01E
3.1.4 Removal of Protective Cushions used in Shipping
(1)Removal of Protective Cushions
After installing the NR800L analyzer, open the cover and remove the (two) cushions on both
sides of the internal spectrometer unit. Keep the cushions because they are re-used when
transporting the unit.
After removing the cushions, tighten a bit the four bolts (as shown a in Figure 3.3) holding the
spectrometer.
Cushions (2)
a
a
Cover fixing Screw
F0303.ai
Figure3.3 Cushionstoxthespectrometer
Remove spectrometer cover xing screws (6 pieces) and open the cover. Remove a laser
cushion and moving mirror cushions (4 pieces) as shown in Figure 3.4. Keep the cushions
because they are re-used when transporting the unit.
(2)Adjusting the Laser position
• Loosen four screws (as shown c in Figure 3.4 ).
• Adjust the gap between the Laser front part and the circular block side (as shown b) to
approximately 2 mm.
• Tighten the four screws so that the laser is positioned with the yellow label facing upward.
• Close the spectrometer cover and lock it with the six removed screws.
8th Edition : Jan. 27, 2023-00