Axetris LGD Compact Quick setup guide

Integration Guide V1.8
Laser Gas Detection
OEM Module
LGD Compact
Axetris AG

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Foreword
Dear customer, we thank you for acquiring an Axetris LGD Compact laser gas detection module. Please
read this document carefully and entirely, to properly install and operate your device.
Axetris laser gas detection modules are manufactured with extreme attention and the highest quality
standards to offer you the best performance for full benefit in your application. Should you require any
additional information or require troubleshooting, please contact us for support.
For questions, service and maintenance information please contact:
Europe and Asia
Headquarters
Axetris AG
Company of the Leister Group
Schwarzenbergstrasse 10
6056 Kaegiswil
Switzerland
Phone: [phone]
Fax: [phone]
[email protected]
www.axetris.com
Americas
Exclusive Distributor
Leister Technologies LLC
1275 Hamilton Parkway
Itasca IL 60143
USA
Toll-Free: +1 844 AXETRIS (844 293 8747)
Fax: [phone]
[email protected]
www.axetris.com
Japan
Leister Technologies KK
Shinyokohama Bousei Bldg 1F
3-12-20, Shinyokohama, Kohoku-ku
Yokohama 222-0033
Japan
Phone: [phone]
Fax: [phone]
[email protected]
https://www.axetris.com
China
Leister Technologies Ltd.
Building 11, 155 Yuanke Road
Xinzhuang Industry Park
Shanghai 201109
PR China
Phone: [phone]
fax: [phone]
[email protected]
https://www.axetris.com
To find your local representative, please visit https://www.axetris.com/en/sales-network
Transmission and/or reproduction of this document is not allowed without the written permission from Axetris
AG. The data and information provided in this document is accurate to the best of our knowledge. This
content is subject to change without prior notice. © Axetris AG

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Important safety instructions
Warnung
Vorsicht
Gefahr! Das Gerät nicht öffnen. Laser Klasse 1.
Der Sensor ist nur mit einem Druck von 800 –1100
mbar zu betreiben.
Das System darf nicht in einer explosiven Umgebung
benutzt werden. Keine ATEX Zertifizierung.
Hinweis
Verbrennungsgefahr! Gasanschlüsse und Gehäuse
nicht in heissem Zustand berühren. Gerät abkühlen
lassen.
Reparaturen sind ausschliesslich durch eine
autorisierte Axetris-Service-Stelle ausführen zu
lassen.
Beim Messen von potenzial gefährlichen
Konzentrationen von giftigen Gasen muss der Auslass
des Sensors in einen sicheren Bereich geführt werden.
Sämtliche in der Bedienungsanleitung gegebenen
Informationen und enthaltenen Warnungen sind
einzuhalten.
Warning
Caution
Danger! Do not open the device. Class 1 laser.
The sensor may be used within a pressure range
from 800 to 1100 mbar only.
The system may not be used in a potentially explosive
environment. No ATEX certification.
Note
Risk of burning! Do not touch gas connections or
housing when they are hot. Allow the device to cool
down.
Repairs shall be assigned exclusively to an
authorized Axetris service point.
When potentially hazardous concentrations of toxic
gases are measured, the sensor outlet must be
transferred to a safe area.
All information and warnings set out in the Operating
Manual must be observed.
Avertissement
Prudence
Danger ! Ne pas ouvrir l’appareil. Laser classe 1.
Le capteur doit uniquement être utilisé à une
pression comprise entre 800 et 1 100 mbar.
Le système ne doit pas être utilisé dans une
atmosphère explosive. Pas de certification ATEX.
Remarque
Risque de brûlure ! Ne pas toucher les raccords de gaz
ni le boîtier lorsqu’ils sont chauds. Laisser refroidir
l’appareil.
Les réparations doivent exclusivement être
effectuées par un centre de service Axetris agréé.
Lors de la mesure de concentrations potentiellement
dangereuses de gaz toxiques, la sortie du capteur doit
être guidée vers une zone sûre.
L’ensemble des informations et avertissements
fournis dans la notice d’utilisation doivent être pris
en compte.

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Advertencia
Precaución
Peligro No abrir el equipo. Láser clase 1.
El sensor solo debe operarse con una presión de
800 –1100 mbar.
No se debe utilizar el sistema en un ambiente
potencialmente explosivo. Sin certificación ATEX.
Indicación
Peligro de quemaduras. No toque las conexiones de
gas ni la carcasa si están calientes. Dejar que el equipo
se enfríe.
Solo los puntos de servicio técnico Axetris están
autorizados a realizar reparaciones en el dispositivo.
Durante la medición de concentraciones potencialmente
peligrosas de gases tóxicos debe colocarse la salida del
sensor en una zona segura.
Deben respetarse todas las advertencias y la
información incluidas en el manual de instrucciones.
Avvertenza
Attenzione
Pericolo! Non aprire l'apparecchio. Laser categoria 1.
Far funzionare il sensore soltanto con una pressione
di 800 –1100 mbar.
Il sistema non può essere utilizzato in un ambiente
esplosivo. Nessuna certificazione ATEX.
Nota
Pericolo di scottature! Non toccare gli attacchi del gas e
l’alloggiamento quando sono roventi. Fare raffreddare
l’apparecchio.
Le riparazioni devono essere eseguite
esclusivamente da un centro di assistenza
autorizzato Axetris.
Nella misurazione delle concentrazioni potenzialmente
pericolose di gas tossici, lo scarico del sensore deve
essere guidato in un ambiente sicuro.
Vanno osservate tutte le informazioni e tutti gli
avvertimenti contenuti nelle istruzioni per l'uso.
警告
小心
危险！不可打开设备。激光级别 1。
只可以 800 –1100 mbar 的压力来运行传感器。
不允许在可引起爆炸的环境中使用此系统。无 ATEX 认
证。
提示
灼伤危险！不要接触热的气体接口和外壳。冷却设备。
仅可由授权的 Axetris 服务部门进行维修。
在测量有毒气体的潜在危险浓度时，必须将传感器的出
口引至安全的区域。
必须遵守在操作说明书中给出的所有信息和警告。

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警告
注意
危険！デバイスを開けないでください。クラス1のレー
ザー。
センサーは800～1100 mbarの圧力でのみ動作しま
す。
システムは、爆発性のある環境で使用することはでき
ません。ATEX認定はありません。
注記
ヤケドの危険があります！高温状態において、ガス接
続部およびハウジングに触れないでください。熱風融
着機をクールダウンさせます。
認定されたAxetrisサービスセンターのみが修理を実
施することができます。
有毒ガスの潜在的に危険な濃度を測定する場合、安全
な場所においてセンサーを差し込む必要があります。
取扱説明書で提供されているすべての情報および警
告情報に従う必要があります。
경고
주의
위험! 장치를 개방하지 마십시오. 1 등급의 레이저.
센서는 반드시 800 –1100 mbar의압력으로
가동해야 합니다.
본시스템은 폭발 환경에서 사용하지 말아야 합니다.
ATEX 인증 안됨.
주의사항
화상위험! 가스 연결부 및하우징은 가열된 상태에서
접촉하지 마십시오. 이런 경우 장치를 냉각시키십시오.
수리는 반드시 인증된 Axetris 서비스 대리점을 통해
실시해야 합니다.
잠재적 위험이 있는 유독 가스 농도를 측정하는 경우,
센서의 출구가 안전한 영역에 위치해야 합니다.
사용설명서에 명시된 모든 정보 및여기에 포함된
경고 사항의 내용을 준수해야 합니다.

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About this Integration Guide
This Integration Guide is the original and legally correct version.
The aim of this Integration Guide is to provide the user all the necessary information to install,
operate and maintain LGD Compact Series Products.
This Integration Guide must be read by all individuals that will be using or servicing this device.
System maintenance and service needs to be performed by qualified and Axetris AG approved
personnel only. The appropriate handling of the product is required for trouble-free operation. This
product is a high-precision measurement device. Careful installation and handling is necessary to
achieve and maintain the specified measurement precision. Correct set-up and operation of the
instrument will allow you to use it safely and to obtain reliable measurement results.
Any warranties regarding this product, and as mentioned in the General Terms and Conditions of
Axetris AG, are void in the event the system is altered or damaged by the user, not installed, used
and serviced according to this document.
Important notes in the text:
Throughout the text, warning and information notes in red, as shown below, inform the user about
crucial points to observe. These warnings and informational notes must be followed scrupulously
and Axetris AG takes no responsibility for any personal injury, death or any damage to equipment
or property resulting from not observing these indications.
The warning sign indicates that severe personal injury/death and/or property damage might
result from not observing safety instructions.
The information sign points to particularly important information and instructions.

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CAUTION
Product damage
Read all instructions carefully before using the device.
The LGD Compact gas sensor modules are not designed to sense liquid flow and damage willresult
if liquid is passed through the sensor.
Gas loaded with particles will eventually contaminate the optics and affect the performance of the
sensor. Please consult our TCS (Technical Customer Support) accordingly.
The appliance must not be used in damp or moist surroundings.
Only use accessories indicated in the instructions for use or which are recommended by
the manufacturer.
Failure to comply with these instructions can result in product damage.
Danger to life
Unprofessional gas handling can cause injury or death. The use of the gas sensor modules should
only be performed by qualified personnel.
Do not use this product as a safety or emergency stop device or in any other application where
failure of the product could result in personal injury or death.
IF THE TEMPERATURE OF THE GAS PROVIDED IS HIGHER THAN THE CELL, A HIGH RISK
OF CONDENSATION AND IRREVERSIBLE DAMAGE OF THE CELL EXISTS.
DO NOT OPEN THE LGD COMPACT MEASUREMENT HEAD: LASER CLASS 1 INSIDE
(Peak Power 2.5 mW - Wavelength: 1500 - 2000 nm).
DO NOT USE THE SYSTEM IN AN EXPLOSIVE ATMOSPHERE: NOT ATEX CERTIFIED.
DO NOT USE WITH EXPLOSIVE GAS MATRIX: NOT ATEX CERTIFIED.
CLASS 1 LASER PRODUCT
(classified according to SN EN 60825:1:2014-08)

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Index
1GENERAL USER INFORMATION........................................................................................................ 9
1.1 LGD Compact introduction ............................................................................................................ 9
1.2 General Specifications................................................................................................................... 9
Environmentalconditions....................................................................................................... 9
Mechanical characteristics................................................................................................... 10
Electrical characteristics ...................................................................................................... 10
Data interface....................................................................................................................... 10
1.3 Measurement software / Customer Frontend.............................................................................. 11
2SYSTEM SET-UP FOR EVALUATION............................................................................................... 12
2.1 Operation conditions, storage & transport................................................................................... 12
2.2 System dimensions and mounting............................................................................................... 12
Sensor module..................................................................................................................... 13
Electronics ........................................................................................................................... 13
2.3 Electrical Interfaces ..................................................................................................................... 14
D-Sub power supply and communication J1 (15pol, 2 rows) .............................................. 15
Micromatch connector J3 (16pol) ........................................................................................ 16
Micromatch connector J5 (20pol) ........................................................................................ 17
D-Sub sensor module J2 (15pol, 3 rows) ............................................................................ 17
Micromatch connector J6 (10pol) ........................................................................................ 18
Supply voltages and output signals..................................................................................... 19
2.4 Gas conditioning and filtering information ................................................................................... 19
2.5 Calibration / calibration verification / offset and span.................................................................. 20
2.6 Zeroing and Purging.................................................................................................................... 20
2.7 Gas supply................................................................................................................................... 21
2.8 Adjusting firmware integration time (T90).................................................................................... 21
3INSTRUCTIONS FOR LGD SYSTEM INTEGRATION....................................................................... 21
3.1 Integration options....................................................................................................................... 21
With electronics housing...................................................................................................... 22
Without housing................................................................................................................... 23
Without housing and without interface board ...................................................................... 23
Instructions for cable packaging.......................................................................................... 24
3.2 Data transmission protocol.......................................................................................................... 25
RS232 Serial settings.......................................................................................................... 25
Overall communication structure......................................................................................... 25
Timing & RS232-protocol..................................................................................................... 27
3.3 Measurement data format ........................................................................................................... 28
3.4 Change of user parameters......................................................................................................... 29
3.5 Commands .................................................................................................................................. 29
Version................................................................................................................................. 29
Stop measurement (Idle)..................................................................................................... 30
Ping user data...................................................................................................................... 30
Configure user data ............................................................................................................. 31
Save to EEPROM................................................................................................................ 32
Starting measurements........................................................................................................ 32
3.6 Status, error and failure response ............................................................................................... 33

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1 GENERAL USER INFORMATION
1.1 LGD Compact introduction
Axetris’ laser gas detector (LGD), “LGD Compact”, is a system for the continuous monitoring of gases such
as CH4, C2H6, C2H2 and CO2. Based on state-of-the-art Tunable Diode Laser Spectrometry (TDLS), the
system has a very high selectivity to the target gas and features an innovative, patented measurement
principle without the need for a physical reference channel. The system is based on a flow-through cell for
extractive gas measurements at ambient temperature.
Typically one system monitors one gas.
Concentration ranges are customer-specific and can
cover 0-100 ppm just as well as percentage range,
depending on the gas and measurement conditions.
Calibration is factory set according to customer
application requirements - generally re-calibration is
not necessary except in cases where the customer
application conditions differ significantly from the
feasible factory calibration conditions. Offset and
span adjustments can be performed on a
maintenance basis and might be necessary due to
systematic differences in calibration and gas delivery
equipment. This can be done via the Graphic User
Interface (GUI) provided with the system software.
Figure 1 LGD Compact Series
1.2 General Specifications
Environmentalconditions
Parameter
Unit
Value / Range
Usage
-
Interior use
Operating temperature range
C
-10 …+651
Operating humidity
% r.H.
0 …99, non-condensing
Operating pressure
mbar
800 …1100
Storage temperature
C
-40 …+80
Storage humidity
% r.H.
0 …99, non-condensing
1
For application specific temperature ranges please see the specifications in the LGD Compact Preliminary Datasheet

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Mechanical characteristics
Parameter
Unit
Value / Range
Measurement cell
-
Flow-through set-up
Cell volume
ml
19
Gas flow (min - max)
ml / min
1’000 - 2’000
Dimensions of sensor
module (Figure 2)
mm
163 (length)
50 (diameter w/o fittings and electrical connector)
Dimensions of electronic unit
with housing
mm
257 x 83 x 26 (L x W x H)
Dimensions of electronic unit
without housing (optional)
mm
105 x 70 x 5 (L x W x H, main board, Figure 4)
84 x 70 x 5 (L x W x H, interface board, Figure 5)
Approx. weight sensor
module
g
≤ 600
Inlet / outlet gas fittings
-
Festo QSML-M5-4, angled
Festo QSM-M5-4, straight
Festo QSMLLV-M5-4-1, stainless steel angled
Electrical characteristics
Parameter
Unit
Value / Range
Voltage supply
min. - max.
VDC
3.6 –5 and 10 - 30 (max. ripple ± 100mV, max. current
1A, no inrush current limitation)
Note: if the module is powered at a voltage between 3.6
and 5 VDC, only product executions without the
interface board are available. Limitations related to data
interface to be considered, refer to section 3.1.3
Power consumption
W
≤ 1 at Tamb 20°C
Start-up time
s
≤ 30
Data interface
Module powered at 10 - 30 VDC (with interface board)
Parameter
Unit
Value / Range
RS 232 EIA
RS 232 TTL
-
-
RS232 protocol
TTL signal amplitude 0 - 3.3 VDC
Analog Current Output
Analog Voltage Output
mA
V
4 - 20, 12-bit resolution (on 0 - 25 mA)
0 - 5, 12-bit resolution
Digital Alarm Outputs (relay)
-
Relay power supply: 10 V < Vcc Relay < 30 V; max.
0.75 A Various alarm outputs available, for more details
refer to the User Manual.

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Module powered at 3.6 –5 VDC (without interface board)
Parameter
Unit
Value / Range
RS 232 TTL
-
TTL signal amplitude 0 - 3.3 VDC
Analog Voltage Output
V
Analog out 0 - 2.5 VDC
Digital Alarm Outputs (relay)
-
Relay power supply: 10 V < Vcc Relay < 30 V; max.
0.75 A Various alarm outputs available, for more details
refer to chapter 2.3
1.3 Measurement software / Customer Frontend
There is a measurement software / Customer Frontend available for download on the Axetris` homepage:
https://www.axetris.com/en/lgd/downloads-lgd
Three different options are available:
1. LGD Frontend Online Installer
Windows ClickOnce application from a public internet server.
2. LGD Frontend Offline Installer
An installation executable which can be downloaded or distributed via offline media (i.e. USB, CDROM,
etc.).
3. LGD Frontend Portable Executable
A portable collection of files which can immediately executed without any installation procedure on any
machine which as .NET framework installed compatible to version 4.6.1.
For the installation executable (2.) administration provisions might be necessary to be granted by the local
admin.
When the Frontend is installed using the ClickOnce service and a connection to the internet is available the
Frontend is automatically checking for available updates in the background. If an update is available the
User is informed by the next execution of the Frontend and can grant to perform an update.
The user can also check for available update using the menu entry "Check for Update" under the help menu.
When the Frontend is not installed using the ClickOnce service or if the internet connection is offline or no
update is available check for update returns silently without any notice.

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2 SYSTEM SET-UP FOR EVALUATION
2.1 Operation conditions, storage & transport
The instrument must be used within the specified ambient conditions and temperature range. Depending
on information provided by the customer, the factory calibration temperature range might cover a more
narrow range adapted to the application and reducing the complexity of the calibration. Please find
conditions for operation and storage in chapter 1.2.1.
Dust or condensing water in the measurement cell leads to signal reduction of the sensor. It is therefore
crucial to ensure that the measurement gas flow is free of dust and that condensation cannot occur:
The systems are not designed for use in an explosive atmosphere.
Irreversible system damage might occur if the use of adequate and application-specific gas
filtration technology is omitted. This is an optical measurement system. For further
information on gas conditioning and filtering please refer to 2.4.
Relative humidity in the measurement gas and measurement conditions must be such that
no condensation occurs inside the measurement cell.
Each sensing module is calibrated to a certain gas temperature and pressure. Deviations in
both parameters can lead to significant degrading of measurement accuracy.
The LGD Compact instrument continuously measures the gas concentration in the measurement cell.
Default measurement time is roughly 1 s (user changeable to up to 600 s integration time or “averaging”).
The LGD Compact has a start-up time of 30 s to give a correct concentration reading.
For any shipments of the system it is recommended to retain and re-use the original shipment material,
which has been tested and proven to be effective protection. Relevant Operation & Storage conditions as
described above as well as in the Product Datasheet need to be respected for shipment. In case of a return
Axetris AG will not be responsible for shipping damage as a result of improperly packaged systems and
recommends customers ship systems insured for full value.
2.2 System dimensions and mounting
Do not open the system. Opening might lead to irreversible damage.
Do not remove the fittings of the measurement cell.
Prevent any dust, insulation or other material from entering the measurement cell.
This chapter describes the dimensions of the sensor module, of the electronics housing and also the printed
circuit boards inside the electronics housing. Further described are the mounting holes of the sensor
module.

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Sensor module
The LGD Compact-A module has two M4 threaded mounting holes located on the side of the sensor (see
Figure 2, recommended to use two pan head cap screw M4x16 (1.5 Nm) for mounting). For gas supply
there are straight/angled QSML-M5-4 quick connectors for 4 mm diameter tubes.
Figure 2 LGD Compact-A module dimensions and interfaces for fixation and gas supply
Electronics
The electronics is located in a separate housing. The outer dimensions of the electronic housing are 257 x
83 x 26mm (LxWxH) without connectors and screws. To avoid damage during operation on the electronics
it`s recommended to fix the electronics box with 4 pan head cap screws M4x10 (1.5 Nm) at the ends.
The electronics housing contains two printed circuit boards (PCBs) as shown in Figure 3.
Figure 3 Electronics housing LGD Compact-A: interface board (left), main board (right)

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Figure 4 Dimensions of the main board
Figure 5 Dimensions of the interface board
The electronic main board should be connected to
the LGD Compact just with the original cable
delivered (recommendations for an own cable
design can be seen in chapter 3.1.4).
The right position for connecting the cable to the
sensor module are marked on the cable connector
as well as on the sensor module.
Figure 6 Correct connection of cable and sensor
module
2.3 Electrical Interfaces
The standard LGD interface is a RS232 connection. Connection to a USB port is possible via an RS232/USB
adapter supplied with the system. Analog 4-20 mA or 0-5 V interfaces will be factory calibrated upon
customer request. More details can be also found at chapter 1.2.4.
To connect the system via a USB port please only use our tested RS232/USB adapter that is
provided with the system.

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Please avoid starting-up or restarting a computer when the LGD is connected to the serial
interface or through a USB port. Switching on the computer with an operating LGD device can
lead to the fact that Windows may identify the device as a serial mouse and the LGD cannot
connect from the interfacing software.
Position the LGD Compact module at the location where the measurement will be carried out and where
computer, power supplies and gas delivery systems can be installed. For customer support and system
service it is ideal if the computer also can be connected to the internet.
To allow simplified connectivity for evaluation a cable integrating both, system power supply and RS232,
are provided (straight RS232 version, not crossed). The DB15 plug on the right-hand side in Figure 7
connects to the mainboard of the instrument (mainboard connector in Figure 7), while the DB9 connector
on the left-hand side in connects to the computer.
The electronic housing has two 15pol D-Sub connectors, one with two rows used for power supply and
communication (J1) and the other one (three rows) for connection to the sensor module (J2).
Figure 7 Combined power supply and RS232
cable. For integration purposes the connectors
can be opened for OEM specific wiring
D-Sub power supply and communication J1 (15pol, 2 rows)
Figure 8 Connector assignment system power
supply and user interface terminal
Figure 9 Connector assignment schematic
Ground Pin 6 & 13 do have the same
potential.
UART Settings (default):
Baudrate: 115’200
Data bits: 8
Parity: no
Stop bit: 1
Flow control: no

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Table 1 Connector assignment 15pol D-Sub (2 rows)
Pin
Name
Description
Power
Supply
1
POWER IN
Power supply input 10 …30V
2
GND IN*
Power supply ground (has to be used separated from GND
to ensure a proper power supply noise filtering)
3
SHIELD
D-Sub 15 Connector –Housing
Digital
Interfaces
6
GND*
Ground serial communication
7
RS232 TX
UART serial communication
8
RS232 RX
UART serial communication
Digital
Alarms
4
ALARM 1
On/Off signal at defined conditions for relay control,
hardware watchdog, etc.
5
ALARM 2
On/Off signal at defined conditions for relay control,
hardware watchdog, etc.
11
ALARM 3
HW watchdog, firmware error and warnings
12
VCC RELAY
Relay power supply: 10 V < VCC Relay < 30 V; max. 0.75
A
13
GND*
Ground, digital alarms
Analog
Interface
9
ANALOG GND*
Analog ground
10
ANALOG OUT
Analog output
Factory setting: output current (4-20mA); output voltage (0-
5V) on request only
Not used
14,
15
n/a
n/a
Shield
Case
SHIELD
Connected from D-Sub casing to cable shield
* same potential
Micromatch connector J3 (16pol)
Figure 10 Connector assignment Micromatch 20pol
Ordering number receptacle:
Manufacturer: TE connectivity
Description: MICRO-MATCH MOW.16P
Article number: 8-215083-6
The connector assignment of J3 is identical to J1 (see Table 1) except the additional pin 16 which is not
used (see Table 2).
Table 2 Connector assignment 16pol Micromatch additional pin 16
Pin
Name
Description
Not used
16
n/a
n/a

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Micromatch connector J5 (20pol)
Figure 11 Connector assignment Micromatch 20pol
Ordering number receptacle:
Manufacturer: TE connectivity
Description: MICRO-MATCH MOW.20P
Article number: 9-215083-0
Be careful in case of connecting J5 directly because there is no protection circuit
implemented on the main board! The protection circuit is placed on the interface board.
Table 3 Connector assignment 20pol Micromatch
Pin
Name
Description
Power
Supply
1
5V*
Power supply input for mainboard
2
5V*
Power supply input for mainboard
3
3.3V
Power supply output 3.3V from mainboard to drive digital
hardware on interface board; not used in case of removing
the interface board
Digital
Interfaces
4
TXD TTL
UART serial communication TTL-Level
5
RXD TTL
UART serial communication TTL-Level
Digital
Alarms
13
ALARM 1
Signal for alarm 1 from Microcontroller, contact Axetris if
needed
15
ALARM 2
Signal for alarm 2 from Microcontroller, contact Axetris if
needed
14
ALARM 3
Signal for alarm 3 from Microcontroller, contact Axetris if
needed
20
ALARM 4
Signal for alarm 4 from Microcontroller, contact Axetris if
needed
Analog
Interface
10
DAC ANALOGOUT
Analog output signal (0…2.5V) from Microcontroller,
contact Axetris if needed
16
HW INTERFACE
PCB
Input for identification of interface board, connect to GND
in case of removing the interface board
11
GND**
Ground
12
GND**
Ground
Not used
6…
9
n/a
n/a
17…
19
n/a
n/a
* connected on main board
** same potential
D-Sub sensor module J2 (15pol, 3 rows)
The sensor module is connected to the electronic housing via a three row D-sub connector.
Figure 12 shows the pin assignment.

Axetris AG LGD Compact Integration Guide V1.8 04.12.2019 18/34
Figure 12 Sensor module connector
assignment
Table 4 Connector assignment 15pol D-Sub (3 rows)
Pin
Name
Description
Measurement
Signal
11
PD_I
Photodiode
12
PD_GND*
Laser control
1
Laser_Drive
Laser diode
9
Laser_GND
5
Laser_Supply3V3
8
Laser_Udiff
6
Laser_ID
2
Laser_Thermistor
Thermal resistance for laser temperature
measurement
3
Laser_GND*
10
Laser_TEC+
Peltier element for laser temperature stabilization
7
Laser_TEC-
4
Laser_PT1K
Thermal resistance for optical head temperature
measurement
Temperature
measurement
13
Gascell_PT1K
Thermal resistance for gas temperature measurement
14
Gascell_GND*
Not used
15
Reserve
n/a
Shield
Case
SHIELD
Connected from D-Sub casing to cable shield
* Same potential
Micromatch connector J6 (10pol)
Figure 13 Connector assignment Micromatch 10pol
Ordering number receptacle:
Manufacturer: TE connectivity
Description: MICRO-MATCH MOW.10P
Article number: 8-215083-0
Table 5 Connector assignment 10pol Micromatch
Pin
Name
Description
Measurement
signal
11
PD_I
Photodiode
12
PD_GND*
Laser control
1
Laser_Drive
Laser diode
9
Laser_GND

Axetris AG LGD Compact Integration Guide V1.8 04.12.2019 19/34
5
Laser_Supply3V3
8
Laser_Udiff
6
Laser_ID
2
Laser_Thermistor
Thermal resistance for laser temperature
measurement
3
Laser_GND*
10
Laser_TEC+
Peltier element for laser temperature stabilization
7
Laser_TEC-
4
Laser_PT1K
Thermal resistance for optical head temperature
measurement
Temperature
measurement
13
Gascell_PT1K
Thermal resistance for gas temperature measurement
14
Gascell_GND*
Not used
15; 16
Reserve
n/a
* same potential
Supply voltages and output signals
Table 6 Supply voltages and output signals with/without interface board
Supply
Voltage
RS232 Communication
Analog Output
Low
High
Low
High
With interface
board
10-30V
-12V
+12V
0V
4mA
5V
20mA
Without
interface board
3.6 - 5V (Pmax
= 1.6W)
0...0.4V
(TTL)
2.4…3.3V
(TTL)
0
2.5V
2.4 Gas conditioning and filtering information
The LGD Compact Gas Sensor Modules are based on an optical measurement technique where
performance is directly linked to optical transmission through the measurement cell. Sample gas containing
particles and aerosols are likely to contaminate the optical windows of the measurement cell and degrade
the optical transmission more or less quickly. Contamination strongly depends on particle size, material,
charging effects, etc. which can vary considerably across different applications. It is therefore generally very
difficult to give a precise specification concerning the purity of the gas in order to avoid contamination on a
reasonable time scale.
Due to the multitude of applications for the LGD, gas conditioning and filtering has to be carried out by the
integrating Original Equipment Manufacturer (OEM). The following points are crucial in order to operate
the module correctly and to achieve long operating lifetime:
The sample gas has to be dust-free; we recommend the use of appropriate filters with pore size ≤
2 µm.
The sample gas has to be moisture-free; we recommend the use of appropriate sample gas dryers
ensuring r.H. ≤ 50% or non-condensing.
The overall performance of the module, the amount of service intervals as well as the lifetime can
be positively influenced by employing appropriate filter technology. We recommend the use of
commercial solutions available from industry-specific manufacturers.
The temperature of the incoming sample gas has to be at the same temperature as the temperature
of the measurement cell. Deviations will create a decrease in accuracy

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2.5 Calibration / calibration verification / offset and span
The calibration is factory set. When the sensor module is used in conditions defined for calibration
(operating temperature 20°C, pressure 1013 hPa and humidity 45% r.H.) there is no need for re-
calibration. However, an additional off-set and span can be added, for instance, in order to compensate
for systematic errors in gas delivery and calibration equipment, or when the sensor is operated at a
different temperature.
If re-calibration or calibration verification
is desired, proceed as follows:
The sensor is designed and calibrated for
measurements of a target gas in N2with
residual humidity content.
Before executing offset and span calibration
or verification, ensure the gas measurement
is stable.
Allow for sufficient time for the instrument to
de-gas before fixing the 0-concentration and
span calibration.
First, carry out the offset and follow with the
span correction procedure. To verify the
calibration, the procedure can be repeated.
The values for span and offset can be set in
the Customer Frontend in the menu
"Settings" -> "Sensor Parameter", changed
parameter can be saved in EEPROM with
"OK" button
Figure 14 Schematic representation of offset
and span adjust for calibration correction
Adjustment of the sensor calibration "Concentration_Offset" [ppm] and "Concentration_Span" [ppm] allows
correcting the measured values with the linear function:
SpanOffsetCC measnew  )( .
 
mbxyor  )(
In practice, the correction values are entered: e.g. if the measured offset is -1 ppm, 1 has to be entered
under Customer offset, and if the slope for the span (or “gain”) is too steep by 5%, enter 0.95 under
Customer Span to correct the slope. Upon "OK" the corrected values will be saved in the firmware of the
sensor and are also used to correct the analog output.
It is best to proceed step-wise: first, correct the offset value at zero concentration and then correct for span
at the application concentration (e.g. 50 ppm).
To go back to the standard calibration, the following values need to be entered: Offset = 0
Span = 1
Please note that if you have a two gas system like CH4/CO2 or CH4/C2H6 you also can
correct offset and span for the 2nd gas concentration.
2.6 Zeroing and Purging
Before starting a measurement, it is generally recommended to perform a zeroing (without target gas in the
flow) and adjust the offset value accordingly. This operation is done to adapt the reading of device to the
actual operation conditions (pressure, temperature, humidity …).
In case of air being used for the zeroing, make sure your device is not measuring CO2 as air may contain
few hundreds ppm of CO2 that will lead to a wrong value for the offset.