SICK GM700 User manual

MMM
I
MMMOPERATING INSTRUCTIONS
OPERATING INSTRUCTIONS
GM700
TDLS Analyzer for NH3, HF or HCI
Cross-Duct Version
Installation, Operation, Maintenance

28011543/YU54/V4-1/2016-04 | SICKOPERATING INSTRUCTIONS | GM700
Subject to change without notice
Described Product
Product name: GM700
Manufacturer
SICK AG
Erwin-Sick-Str. 1 · 79183 Waldkirch · Germany
Phone: [phone]
Fax: [phone]
E-Mail: [email protected]
Place of Manufacture
SICK AG
Nimburger Str. 11 · D-79276 Reute · Germany
Legal Information
This work is protected by copyright. Any rights derived from the copyright shall be
reserved for SICK AG. Reproduction of this document or parts of this document is only
permissible within the limits of the legal determination of Copyright Law.
Any modification, shortening or translation of this document is prohibited without the
express written permission of SICK AG.
The trademarks stated in this document are the property of their respective owner.
© SICK AG. All rights reserved.
Original document
This document is an original document of SICK AG.

3
8011543/YU54/V4-1/2016-04 | SICK OPERATING INSTRUCTIONS | GM700
Subject to change without notice
Warning Symbols
Warning Levels / Signal Words
DANGER
Risk or hazardous situation which will result in severe personal injury or death.
WARNING
Risk or hazardous situation which could result in severe personal injury or death.
CAUTION
Hazard or unsafe practice which could result in personal injury or property damage.
NOTICE
Hazard which could result in property damage.
Information symbols
IMMEDIATE HAZARD
of severe injuries or death
Hazard (general)
Please consult the documentation
Hazard by corrosive substances
Hazard by voltage
Hazard by unhealthy substances
Hazard by toxic substances
Hazard by laser radiation
Important technical information for this
product
Important information on electric or
electronic functions
Nice to know
Supplementary information
Link to information at another place

CONTENTS
48011543/YU54/V4-1/2016-04 | SICKOPERATING INSTRUCTIONS | GM700
Subject to change without notice
1 Safety Information..................................................................................... 8
1.1 Main hazards .................................................................................................. 8
1.1.1 Electrical safety .............................................................................. 9
1.1.2 Grounding the device ..................................................................... 9
1.1.3 Protection against hazards through gases ................................ 10
1.1.4 Protection against laser radiation ............................................... 11
1.1.5 Behavior during purge air failure................................................. 13
1.2 Intended use ................................................................................................. 13
1.2.1 Purpose of the device .................................................................. 13
1.3 Responsibility of user ................................................................................... 13
1.3.1 Disposing of device parts harmful to the environment ............. 14
2 Product Overview..................................................................................... 15
2.1 Product identification .................................................................................. 15
2.2 GM700 system, Cross-Duct version, layout ................................................ 15
2.3 GM700 options and accessories ................................................................. 17
2.4 Measuring principle...................................................................................... 18
2.4.1 Reference cuvette for wavelength stabilization.......................... 18
2.4.2 Signal evaluation.......................................................................... 18
3 Project planning....................................................................................... 19
3.1 Work steps from system selection to start-up............................................. 19
3.2 Project Planning Checklist............................................................................ 20
3.3 Initial onsite installation............................................................................... 22
3.3.1 Installation preparation at the measuring point ......................... 22
3.3.2 Uncovering the duct ..................................................................... 22
3.3.3 Installing the flanges with tube ................................................... 23
3.3.3.1 Performing installation ............................................. 24
3.3.4 Installation preparation for the purge air units........................... 26
3.3.5 Duct insulation ............................................................................. 26
3.3.6 Installation preparation for the evaluation unit .......................... 26
3.4 Preparations for electrical installation ........................................................ 27
3.4.1 Signal and power supply cables .................................................. 27
3.4.2 CAN bus wiring ............................................................................. 29
4 Installation................................................................................................ 30
4.1 Preparations ................................................................................................. 30
4.1.1 Checking the scope of delivery.................................................... 30
4.1.2 Installation prerequisites ............................................................. 30
4.2 Fitting system components .......................................................................... 31
4.2.1 Information on installing the SR-unit and reflector .................... 31
4.3 Installing the purge air units ........................................................................ 31
4.3.1 Terminal box with 24 V power supply unit (option)..................... 31
Contents

CONTENTS
5
8011543/YU54/V4-1/2016-04 | SICK OPERATING INSTRUCTIONS | GM700
Subject to change without notice
4.4 Installing the evaluation unit ........................................................................32
4.4.1 Installing the evaluation unit – sheet metal enclosure version .32
4.4.2 Installing the evaluation unit – cast-metal enclosure version....33
4.5 Electrical connection of system components ..............................................34
4.5.1 CAN bus wiring options.................................................................34
4.5.2 Electrical connection in the evaluation unit EvU.........................35
5 Operation ..................................................................................................38
5.1 User qualifications ........................................................................................38
5.2 Operating elements.......................................................................................38
5.2.1 Menu overview..............................................................................39
6 Start-up......................................................................................................42
6.1 Preparations ..................................................................................................42
6.1.1 Required qualifications and further prerequisites ......................42
6.1.2 Prerequisites for successful start-up: ..........................................42
6.1.3 Tools and equipment....................................................................43
6.1.4 Start-up steps overview ................................................................43
6.1.5 Checking the scope of delivery ....................................................44
6.1.6 Removing the transport safety devices .......................................44
6.2 Measuring path free from sample gas - zero path ......................................45
6.2.1 Preparing a zero path ...................................................................45
6.2.2 Fitting the GM700 system components ......................................46
6.2.3 Electrical connections ..................................................................50
6.2.4 Optical alignment..........................................................................51
6.2.4.1 Optical alignment (for device version for NH3and
HF measurement) .....................................................51
6.2.4.2 Optical alignment of device version for HCl
measurement ...........................................................53
6.2.5 Zero adjust ....................................................................................53
6.2.6 Preparing the system for zero adjust...........................................53
6.2.7 Performing zero adjust .................................................................53
6.2.8 Installing the purge air fixtures ....................................................54
6.2.9 Purge air units start-up.................................................................55
6.2.10 Sender/receiver unit and reflector start-up ................................56
6.3 Installing weatherproof covers (option) .......................................................58
6.3.1 Evaluation unit start-up ................................................................60
6.3.2 Operating states ...........................................................................61
6.3.3 Starting operating mode...............................................................61
7 Maintenance.............................................................................................63
7.1 Safety.............................................................................................................63
7.2 Maintenance intervals ..................................................................................63
7.2.1 Maintenance protocol...................................................................63
7.3 Preparation and general preparatory work..................................................63

CONTENTS
68011543/YU54/V4-1/2016-04 | SICKOPERATING INSTRUCTIONS | GM700
Subject to change without notice
7.4 Maintenance work on SR-unit and reflector................................................ 64
7.4.1 Visual inspection and enclosure cleaning................................... 64
7.4.2 Cleaning the front windows on the SR-unit and on the
reflector ....................................................................................... 64
7.5 Evaluation unit (EvU) .................................................................................... 66
7.5.1 Selecting the ambient temperature range ................................. 66
7.5.2 Filter box measurement to check the measuring channels for
NH3, HF or HCl.............................................................................. 67
7.5.3 Determining the necessary test gas concentration .................... 68
7.5.4 Installing the filter box ................................................................. 68
7.5.5 Carry out filter box measurement................................................ 70
7.6 Checking the gas analyzer with test cell GMK10........................................ 71
7.6.1 Installation of the GM700 components with the test cell
GMK10.......................................................................................... 72
7.6.2 Carrying out measurement .......................................................... 73
8 Troubleshooting and Clearing Malfunctions........................................ 76
8.1 Malfunction categories/possible effects..................................................... 76
8.2 Purge air failure ............................................................................................ 76
8.3 Integrated monitoring and diagnosis system .............................................. 76
8.3.1 Display and retrieval of messages on the evaluation unit ......... 77
8.3.2 Troubleshooting and clearing malfunctions, evaluation unit..... 78
8.3.3 Error messages ............................................................................ 79
8.3.4 Warning messages ....................................................................... 81
8.3.5 Further tips on troubleshooting ................................................... 82
9 Technical Data, Expendable and Spare Parts ..................................... 83
9.1 Technical Data GM700 Cross-Duct system................................................. 83
9.2 Dimension drawing....................................................................................... 87
9.2.1 GM700 receiver unit dimensions ................................................ 87
9.2.2 GM700 reflector unit dimensions ............................................... 88
9.2.3 Purge air fixtures dimensions ...................................................... 88
9.2.4 Flanges with tube dimensions ..................................................... 89
9.2.5 Evaluation unit dimensions ......................................................... 89
9.2.6 Connection unit dimensions ........................................................ 90
9.2.7 Weatherproof cover dimensions.................................................. 90
9.3 Accessories, expendable and spare parts................................................... 92
9.3.1 Consumable parts for 2-years operation..................................... 92
9.3.2 Spare parts for the sender/receiver unit .................................... 92
9.3.3 Spare parts for the reflector unit................................................. 93
9.3.4 Spare parts for the purge air fixture (sender/receiver unit)....... 93
9.3.5 Spare parts for the purge air fixture (reflector side)................... 93
9.3.6 Spare parts for the evaluation unit ............................................. 94
9.3.7 Fixing accessories ........................................................................ 94
9.3.8 Spare parts assignment for sender/receiver unit ...................... 95

CONTENTS
7
8011543/YU54/V4-1/2016-04 | SICK OPERATING INSTRUCTIONS | GM700
Subject to change without notice
10 Annex.........................................................................................................98
10.1 User information “Laser safety” ...................................................................98
11 Index ....................................................................................................... 100

88011543/YU54/V4-1/2016-04 | SICKOPERATING INSTRUCTIONS | GM700
Subject to change without notice
1SAFETY INFORMATION
1 Safety Information
1.1 Main hazards
Operational safety
DANGER: Hazards through defective device
The safety of the GM700 is endangered when it:
●Has been penetrated by moisture.
●Has been stored or operated under irregular conditions.
When safe operation is no longer possible:
▸Put the GM700 out of operation, separate all connections from the power supply
and secure against unauthorized start-up.
WARNING: Hot surfaces when enclosure open
Pay attention to hot surfaces of the measuring cell when opening the GM700
enclosure.

9
8011543/YU54/V4-1/2016-04 | SICK OPERATING INSTRUCTIONS | GM700
Subject to change without notice
SAFETY INFORMATION 1
1.1.1 Electrical safety
1.1.2 Grounding the device
WARNING: Hazard by voltage
▸Pay careful attention to power supply connections.
▸Do not interrupt protective conductor connections.
WARNING: Endangerment of electrical safety by not switching the power
supply off during installation and maintenance work.
An electrical accident can occur during installation and maintenance work
when the power supply to the device and/or lines is not switched off using a
disconnector switch/circuit breaker.
▸Before starting the work, ensure the power supply can be switched off
using a power isolating switch/circuit breaker in accordance with
DINEN61010.
▸Make sure the disconnector switch is easily accessible.
▸An additional disconnecting device is mandatory when the power isolating
switch is difficult to access or cannot be accessed when connecting the
equipment after installation.
▸The power supply may only be activated again after the work or for test
purposes by personnel carrying out the work under consideration of valid
safety regulations.
WARNING: Endangerment of electrical safety through power cable with
incorrect rating
When a removable power cable is used, electrical accidents can occur when
the specifications are not fully observed.
▸Always observe the exact specifications in the Operating Instructions
(Technical Data Section) when replacing a removable power cable.
CAUTION: Equipment damage through erroneous or missing grounding
During installation and maintenance work, it must be ensured that the
protective grounding to the devices and/or lines involved is effective in
accordance with EN 61010-1.

10 8011543/YU54/V4-1/2016-04 | SICKOPERATING INSTRUCTIONS | GM700
Subject to change without notice
1SAFETY INFORMATION
1.1.3 Protection against hazards through gases
WARNING: Hot and/or aggressive sample gases
▸Wear suitable protective clothing and mask when using hot and/or aggressive
sample gases and/or with high dust loads.
▸Never open the enclosure or switch off the purge air feed without taking appropriate
protective measures when the duct is pressurized.
WARNING: Toxic and caustic substances in parts in contact with sample gas
●Depending on the sample gas composition, parts of the GM700 in contact with
sample gas can contain toxic or caustic substances.
●When fitted in the measuring device, the reference cuvette contains the respective
gases to be measured. These gases must not escape.
Special care must be taken with the GME700-2 (HF). This cell not only contains
gaseous HF but also a certain amount of liquid (max. 0.1 g HF for 8 cm cell). HF /
hydrofluoric acid is extremely toxic and caustic. It is imperative to avoid inhaling or
skin contact at all times. Particularly when there are indications of leaks or defects,
wear protective clothing (protective goggles, latex gloves) and carry out work in a well
ventilated room/area. Never open the cuvette under any circumstances. Check
replacement cuvettes for any possible transport damage.
●Handle with care when test gases are used:
▸When handling HF, keep an HF emergency set (including calcium gluconate gel)
available.
▸Before working on the gas path, ask the operator which gases have been applied to
the GM700.
▸Ask the operator whether, and how, the gas path of the GM700 has been cleaned.
▸If necessary, clean the gas path with a suitable method.
▸In case of doubt, take appropriate protective measures before working on the gas
path: Ensure adequate ventilation at the workplace or work under a vent. Wear
protective goggles or a safety mask, protective gloves and acid-proof protective
clothes.
WARNING: Risk of fire through hot gas escaping in installations with
overpressure conditions
On installations with overpressure, the purge air hose can be severely
damaged by escaping hot gas and can catch fire depending on the
temperature.
On plants with overpressure as well as gas temperatures over 200°C:
▸Ensure reverse flow is prevented by fitting a valve.
▸Regularly check the functionality of the reverse flow safeguard.

11
8011543/YU54/V4-1/2016-04 | SICK OPERATING INSTRUCTIONS | GM700
Subject to change without notice
SAFETY INFORMATION 1
1.1.4 Protection against laser radiation
The GM700 laser warning sign is located on the sender/receiver unit.
Fig. 1: Laser warning sign (for HF measurement) on the GM700 sender/receiver unit
Fig. 2: Laser sign for NH3measurement
WARNING: Eye injuries possible due to laser radiation
 Observe all relevant information in these Operating Instructions.
NOTE: Deviations of EN60825-1:2014-08 “Laser safety” from the Directive
2006/25/EC
Due to the implemented health and safety regulation for artificial optical radiation
concerning the Directive, deviations of EN60825-1:2014-08 “Laser safety” from
Directive 2006/25/EC have occurred.
▸Always observe the user information in the Annex of these Operating Instructions!
“User information “Laser safety””, page 98.
Laser outlet
Laser warning sign

12 8011543/YU54/V4-1/2016-04 | SICKOPERATING INSTRUCTIONS | GM700
Subject to change without notice
1SAFETY INFORMATION
Fig. 3: Laser sign for HCI measurement
The invisible laser beam within the SR-unit is not accessible when fitted. There is no risk for
the human eye when looking into the optic visor on the right side of the SR-unit.
Laser capacity
The wavelength of the laser varies for the respective measuring components (NH3, HF,
HCl).
The maximum laser output at the optical interface depends on the respective measuring
component and is shown on the laser warning sign.
–HF:
“Laser warning sign (for HF measurement) on the GM700 sender/receiver unit”,
page 11.
–NH
3: “Laser sign for NH3 measurement”, page 11.
–HCI:“Laser sign for HCI measurement”, page 12.
CAUTION: Observe the following for the GM700 HF version:
As the limit values of laser class 1 of the IEC 60825-1:2014-5 are neither exceeded
in single case malfunctions nor normal operation under consideration of the service
and measuring state, the device is classified as laser class 1.
Requirement: Use of device software 9105060_YEK0 or newer.
CAUTION: Important information for safe handling of the GM700 SR-unit HF
version
For device software versions older than 9105060_YEK0, a higher laser radiation
might occur.
▸Laser class 1 of the IEC 60825-1:2014-5: Only use device software
9105060_YEK0 or a newer software version.
CAUTION: Important information for safe handling of the GM700 SR-unit
(all versions)
▸Never look directly into the exit lens when opening the SR-unit or the reflector.
▸Always wear laser goggles or switch the device off during maintenance work.
▸Observe valid national limit values and respective standards for work safety.
The emitted radiation is harmless to human skin.

13
8011543/YU54/V4-1/2016-04 | SICK OPERATING INSTRUCTIONS | GM700
Subject to change without notice
SAFETY INFORMATION 1
1.1.5 Behavior during purge air failure
Depending on the configuration, the GM700 measuring system requires a purge air supply.
Failure of the purge air supply demands measures to be taken immediately or within a
short time, depending on the installation conditions, to protect the measuring system.
1.2 Intended use
1.2.1 Purpose of the device
The gas analyzer GM700 measures the concentration of the sample gas component, e.g.
HF, NH3 or HCl in a gas mixture (sample gas). For this purpose, the GM700 analyzer is
assembled at the measuring location and measures directly onsite (in-situ measurement).
!▸ Do not use the device to expose persons to radiation.
1.3 Responsibility of user
Designated user
The gas analyzer GM700 may be operated by competent persons only who, based on their
device-specific training and knowledge of the device as well as knowledge of the relevant
regulations, can assess the tasks given and recognize the hazards involved.
Correct use
▸Use the device only as described in these Operating Instructions. The manufacturer
bears no responsibility for any other use.
▸Carry out the specified maintenance work.
▸Do not remove, add or change any components in or on the device unless such changes
are officially allowed and specified by the manufacturer. Otherwise
– the device can become dangerous.
– the manufacturer's warranty becomes void.
Special local requirements
Follow local laws, regulations and company-internal operating directives applicable at the
installation location.
Responsibility for dangerous substances
Safety precautions examples:
●Marking the device with warning signs.
●Marking the operating area with warning signs.
●Safety-related instruction of personnel who could be in the vicinity of the installation
site.
Retention of documents
▸Keep these Operating Instructions available for reference.
▸Pass on to a new owner/operator.
Measures for purge air feed failure
▸Refer to Purge Air Unit Operating Instructions.
WARNING: Mortal/health danger as a result of a gas path leakage
When the device is used to measure toxic gases: A leak, for example in the purge air
supply, can be an acute hazard for persons.
▸Take suitable safety measures.
▸Make sure these safety precautions are followed.

14 8011543/YU54/V4-1/2016-04 | SICKOPERATING INSTRUCTIONS | GM700
Subject to change without notice
1SAFETY INFORMATION
1.3.1 Disposing of device parts harmful to the environment
WARNING: Possible materials harmful to the environment and health
GM700 components can have small shares of pollutants or hazardous substances
such as low lead content in printed circuit boards. The optional permanent cuvette
contains low concentrations of HF or HCl (according to device configuration, see scope
of delivery).
▸Dispose of all GM700 components according to local laws, regulations and
company-internal operating directives applicable at the installation location such as:
▸Printed circuit boards and similar electronic components.
▸Dispose of the permanent cuvette, when fitted, safely. It can contain low
concentrations of HCI or HF. Therefore, do not simply destroy the cuvette.

15
8011543/YU54/V4-1/2016-04 | SICK OPERATING INSTRUCTIONS | GM700
Subject to change without notice
PRODUCT OVERVIEW 2
2ProductOverview
2.1 Product identification
2.2 GM700 system, Cross-Duct version, layout
Fig. 4: Standard layout for GM700 measuring systems (Cross-Duct version)
Product name: GM700
Device versions
GM700 Cross-Duct version
Device type GM700-2, HF version, was performance-tested for
measuring ranges 5 and 25 mg/m3in accordance with EN15267-3
(TÜV Rheinland 936/21210058/A of September 30, 2010)
Manufacturer: SICK AG
Erwin-Sick-Str. 1 · 79183 Waldkirch · Germany
Type plates: ●SR-unit: On the right side
●On the purge air fixture
GM700 version: Measuring component:
GM700-2 HF
GM700-3 HCI
GM700-5 NH3
GM700-8 HCI / H2O
GM700-9 NH3/H2O
maintcalpardiag
GM
EvaluationUnit
CO
CO
2
H
2
O
mg/
m
3
236
Ref.conditions
Hum:wet
Measuring Operation
Service
Warnin
Malfunction
Sender/receiver unit (SR-unit)
Purge air unit SLV 4
(2nd purge air unit depending on application)
Evaluation unit
EvU
Inputs/outputs
analog, digital
Flanges with tube
Purge air fixtures
CAN bus
Reflector

16 8011543/YU54/V4-1/2016-04 | SICKOPERATING INSTRUCTIONS | GM700
Subject to change without notice
2PRODUCT OVERVIEW
Sender/receiver unit (SR-unit)
The sender/receiver unit contains the optic and electronic subassemblies of the
measuring system. The gas concentration is captured here and the measured value
determined.
Reflector
Reflector unit with hollow triple reflector
Purge air unit
The purge air unit generates the purge air supply for the SR-unit and the reflector. It
protects against contamination and high gas temperatures. Use one purge air unit each for
the SR-unit and the reflector depending on the application. The blower types for the SR-unit
and/or reflector are each designed differently depending on the application.
Purge air fixtures for the SR-unit and reflector
Purge air fixtures are required to fit the SR-unit and the reflector on the mounting flanges.
These include the purge air connections to connect the purge air hoses from the purge air
unit and sockets for the connection cable as well as to connect external sensors (purge air
unit filter monitor, temperature sensor PT 1000, on the SR side).
Evaluation unit
The evaluation unit (EvU) is responsible for measured value processing and output as well
as control and monitoring functions. The EvU can be installed near the SR-unit or up to
approx. 1000 m from the measuring point, e.g. in the central control/monitoring room.
Functions of the EvU:
●Output of measured values, computed data and operating states
●Communication with the peripheral equipment
●Output of error messages and other status signals
●Control of automatic test functions and access during service work (diagnosis)
Connection cables
Further information on the purge air unit
▸Refer to Purge Air Unit Operating Instructions.
Cable type Part No.
Cable (CAN bus) SR-unit – purge air fixture, length 0.8 m 2 023 704
Connection cable[1] SR-unit – reflector; various lengths available, e.g. 5, 10,
12, 15 or 24 m Scope of delivery
●Cable (CAN bus) SR-unit – evaluation unit, length 4 m
●Extension up to 1000 m, with terminal box
●Scope of delivery
●Option: 2020440
Cable[2] purge air fixture SR-unit – purge air unit filter monitor, 5 m 2 032 143
2 cables,2) purge air fixture SR-unit – purge air unit filter monitor, length 2 m
extension 6 025 923
Cable, purge air fixture SR-unit – filter monitor for purge air unit, length 3 m
extension 6 028 663
Table 1: Connection cables Part Nos.
[1] one cable included in scope of delivery
[2] Included in scope of delivery

17
8011543/YU54/V4-1/2016-04 | SICK OPERATING INSTRUCTIONS | GM700
Subject to change without notice
PRODUCT OVERVIEW 2
Flanges with tube
Fig. 5: Flange with tube
The purge air fixtures are mounted to the flanges for the installation of the SR and/or
reflector unit. ANSI or DIN flanges provided by the customer can be used instead of the
flanges supplied.
2.3 GM700 options and accessories
●Terminal box for CAN bus with 24 V power supply
The optional terminal box is available for distances between SR-unit and EvU >4 meters
via a CAN bus cable provided by the customer.
The total length of all CAN bus connections: up to 1000 m.
●Cover plate for purge air fixture of the sender/receiver unit
To maintain purge air supply in cases where this must remain in operation at the mea-
suring point when the SR-unit is dismounted.
●Weatherproof cover for SR-unit and purge air unit
Required for outdoor installation – dimension drawings, see “Dimension drawing weather-
proof cover for GM700 SR-unit (dimensions in mm)”, page 90.
●Chart recorder, single or multi-channel, for measured value recording. Protocol(s) can of
course be produced using customer systems.
●Air heater for purge air supply
For special application conditions to prevent condensate. An air heater is required when
the difference between gas temperature and dew point temperature is too small. The
following practical rule of thumb serves as guideline:
An air heater is recommended when
Gas temperature [°C] – dew point temperature [°C] < abs. humidity [vol. %].
Values are compared without considering the units of measure.

18 8011543/YU54/V4-1/2016-04 | SICKOPERATING INSTRUCTIONS | GM700
Subject to change without notice
2PRODUCT OVERVIEW
2.4 Measuring principle
The light of the laser diode radiates through the sample gas and is then detected by a
photo diode. The laser diode wavelength is set to a single absorption line of the sample gas
component. This absorption line is scanned by modulating the wavelength and then the
transmission signal (relation between signal sent and received) captured by a photo diode.
An appropriate signal evaluation returns the magnitude of the absorption line from which
the gas concentration is then calculated. This method is called Tunable Diode Laser
Spectroscopy (TDLS) or Tunable Diode Laser Absorption Spectroscopy (TDLAS).
The laser beam from the sender/receiver unit travels through the active measuring path
and then impinges on the reflector on the other side of the gas duct. The beam is then
reflected back to the sender/receiver unit. After the beam has passed through the
measuring path twice, during which laser light absorption specific to the gas occurs, the
light is focussed on a receiver optics.
A laser specially developed for gas analysis is used as light source in the GM700. This laser
diode radiates a wavelength with a narrow line width so that an absorption line can be
reliably scanned. A Peltier element and a temperature sensor fitted in the laser diode
enclosure ensure a precise temperature and therefore exact wavelength stabilization of the
system.
2.4.1 Reference cuvette for wavelength stabilization
The permanently filled cuvette serves for the adjustment of the analyzer laser diode with
the reference position of the gas absorption line (line locking.
2.4.2 Signal evaluation
The optimized algorithms of the GM700 evaluation electronics process the measurement
signal of the receiver element together with the corresponding parameters based on the
TDLS measuring method. This is based on the physical characteristics of the gas
molecules that absorb light energy in certain wavelengths. These optimized algorithms
ensure the concentrations of sample gas components are determined without cross-
sensitivities to other gases. The differential absorption measurement also eliminate dust
influences.

19
8011543/YU54/V4-1/2016-04 | SICK OPERATING INSTRUCTIONS | GM700
Subject to change without notice
PROJECT PLANNING 3
3 Project planning
3.1 Work steps from system selection to start-up
Application changes
If you make changes to the specifications ordered for your application or if a device is to be
used for an application different to the one originally planned, please pass this information
onto your local sales representative so that we can determine the application options
under changed conditions and whether new adjustment/parameter settings are required.
The following steps are generally carried out before the measuring system is started up:
1Project planning
“Project Planning Checklist”, page 20.
2Initial onsite installation
Following preparatory work normally carried out by the customer is described in“Initial
onsite installation”, page 22:
– Flange installation,“Installing the flanges with tube”, page 23.
– Preparation for assembling the purge air unit,“Installation preparation for the purge air
units”, page 26.
– Laying the signal and power supply cables to the measuring point,“Signal and power sup-
ply cables”, page 27.
3Installation preparation for the EvU,“Installation preparation for the evaluation unit”, page 26.
– Possibly preparation of signal cables for the interface to the peripheral equipment,
“Preparations for electrical installation”, page 27.
4Device installation
To allow speedy start-up, the following components are normally installed ready for
operation before the start-up date; see“Installation”, page 30.
– Purge air unit
– Evaluation unit(s)
Start-up, see “Start-up”, page 42.

20 8011543/YU54/V4-1/2016-04 | SICKOPERATING INSTRUCTIONS | GM700
Subject to change without notice
3PROJECT PLANNING
3.2 Project Planning Checklist
▸Work through the checklist step by step during project planning.
Technical data and dimension drawing, see “Technical Data GM700 Cross-Duct system”,
page 83 and see “Dimension drawing”, page 87 ff.
Topic Task Measure/determination
Determine measuring point.
Observe national regulations
such as VDI 3950.
Provide for unhindered inlet and outlet paths:
●For round duct cross-sections: 3 times the duct diameter
●For rectangular cross-sections: Hydraulic diameter
●If these specifications cannot be met: Inlet section > outlet section,
e.g. 2/
3: 1/3; uniform concentration spread whenever possible.
Emission measuring
point
▸Obtain official approval for emission measuring point.
▸Provide for calibration openings at an easily accessible place.
▸Ensure the GM700 and calibration probe do not influence each
other; the calibration gland should be located at a minimum
distance of 0.5 m away from the measuring device, upstream.
Application conditions ▸Observe Technical Data for duct/ambient conditions!
▸Gas temperature above/below dew point (dry/wet).
Pressure conditions at
the measuring point
▸A fitting location with partial vacuum in the duct is ideal.
▸For duct pressures > 10 mbar, contact SICK on correct selection of
the purge air blower.
SR-unit, reflector
“Installation preparation at the mea-
suring point”, page 22
Select suitable flange
with tube
▸Flange fitting is planned in steel ducts as standard; corresponding
flanges with tube are normally included in the GM700 scope of
delivery.
▸Stone stacks or ducts with thick walls demand an onsite retaining
plate and, possibly, a longer version of the flange with tube; “Install-
ing the flanges with tube”, page 23.
“Dimension drawing flanges with tube (dimensions in mm)”, page 89.
Duct openings
selection
▸Provide an opening of suitable size for the flange tube.
▸Plan adequate clearance for installation and maintenance activities
for the duct insulation cutout.
▸Plan clearances for handling the SR-unit, reflector
▸Ensure the ambient temperature for the SR-unit and/or reflector is
within the specified range.
▸For installation outdoors, plan a weatherproof cover.
Tools for start-up and
maintenance
▸When working on the zero path; prerequisites: Clean ambient
atmosphere free from sample gas; weatherproof: Plan the zero
path or order from SICK.
Purge air unit
“Installation preparation for the
purge air units”, page 26
Fitting location
selection
▸Plan installation location on the duct in immediate vicinity (5 m) of
the GM700 SR-unit.
▸Keep purge air hoses to the respective purge air fixture (SR-unit,
reflector) as short as possible (pressure loss approx. 1.2 mbar per
meter). With only one purge air unit, the hose lengths to both purge
air fixtures should be equal when possible.
▸Allow for secure cable guidance.
▸Ensure dry and, whenever possible, dust-free intake air on the
purge air unit, use a preliminary filter as necessary.
▸The intake air temperature should be between 0 and 55 °C. Heat
the purge air for T < 0 °C; see air heater option (“GM700 options
and accessories”, page 17).
▸For installation outdoors, plan a weatherproof cover.
Table 2: Project Planning Checklist
D4F (Cross-sectional area)
U (Circumference)
-------------------------------------------------------------------------------------=