GASTRON GTD-1000Tx User manual

Headquarters / Engineering research laboratory :
23 Gunpo Advance d Industry 1-ro(Bugok-dong), Gunpo-si, Gyeonggi-do
Tel [phone] Fax [phone]
Yeongnam business office / Plant :
55 Gonghangap-gil 85beon-gil, Gangseogu, Busan Metropolitan City
Tel [phone] Fax [phone]
E-mail : [email protected]
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GTD-1000Tx(2W)
Instruction Manual
Read in detail for correct use.

* KOSHA GUIDE : P-135/6-2018
Calibration must be performed at a frequency requested by the manufacturer and shall be performed quarterly
when the calibration period is not specified.
Gas & Flame
Detection System
GTD-1000Tx(2W)
Instruction Manual
www.gastron.com
02_03
Greetings
When abnormalities occur after purchasing the
product, please contact the following address.
· Address : 23 Gunpo Advanced Industry 1-ro,
Gunpo-si, Gyeonggi-do
· Tel : [phone]
· Fax : [phone]
· URL : www.gastron.com
· e-mail : [email protected]
We sincerely thank you for purchasing the product of Gastron Co. Ltd.
Our Gastron Co.Ltd. is a company specialized in Gas detector and Gas Monitoring System, being recognized
by many consumers due to the best quality and use convenience. We always enable you consumers to find
desired products nearby and are ceaselessly studying and striving for development of Gas detectors satisfying
customers. From now on, solve all anguishes concerning Gas detector with the products of Gastron Co. Ltd,
We Gastron Co. will take a responsibility and give you satisfaction.
In the present instruction manual, operation method for Gas detector as well as simple methods for
maintenance and repair, etc. are recorded If you read it in detail and keep it well, for reference when you
have questions, then it will give you much help.
The present product and the product manual can be changed without advance notice for performance improvement
and use convenience of the product.
■ForaccurateoperationofGasdetector,checkupandcalibrateformorethanonceinevery6months.
( * In reference to KOSHA GUIDE: P-135/6-2018 / 7.2 In-house inspection, section 2 )
■ForaccurateoperationofGasdetector,checkupandcalibrationwithcalibrationgasbefore
measurement is recommended.
■Whennotcalibrated,itmaycausemalfunctionoftheequipmentduetoproblemsresultingfrom
Sensor aging.
■Whenthepresentinstrumentshouldbedismantled,thosewithprofessionalskillsforGasdetector
should conduct the operation.
■Forpowersupplycable,wirespecificationsshouldbedeterminedbyreferringtotheitemof"Length
 ofinstalledcable".
■ForthecontentsoncheckupandcalibrationofGasdetector,pleaseuseourcompany'sengineering
department , e-mail, or web site.

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04_05
ContentsContents
GTD-1000Tx(2W)
Instruction Manual
9. Revision History··························································································································································· 21 1. Overview ······································································································································································ 6
2. Configuration······························································································································································ 6
3. Specification ································································································································································ 7
3.1. Basic Specifications ············································································································································ 7
3.2. Mechanical Specifications ································································································································· 7
3.3. Electrical Specifications (Standard Type)··········································································································· 8
3.4. Environmental Specifications ···························································································································· 8
4. Name and Description of Each Part························································································································ 9
4.1. Components ······················································································································································ 9
5. Installation ····························································································································································· 11
5.1. Detachment of Housing Cover·························································································································· 11
5.2. Main PCB Configuration···································································································································· 12
5.3. Power Signal and Terminal Configuration ········································································································ 13
5.4. Method to Connect to External Control Unit ··································································································· 14
5.5. Installation Cable Length ··································································································································· 15
6. Calibration and Maintenance ·································································································································· 16
6.1. 4-20mA Output Diagnosis ································································································································ 16
6.2. 4mA Adjustment (ZERO Calibration)················································································································ 16
6.3. SPAN Calibration················································································································································ 17
7. Drawings and Dimensions········································································································································ 18
8. Precautions before Installation ································································································································ 19
8.1. Selecting a Place for Installation (Occupational Health & Safety Act Data) ····················································· 19
8.2. Selecting a Site for Installation (High-Pressure Gas Safety Control Act Data) ················································· 19
8.3. Precautions before Installation·························································································································· 19

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06_07
3. Specication
GTD-1000Tx(2-wire, referred to as 2W herein after) toxic gas detector has been developed to detect gas leaked from
industrial sites and various toxic gases generated from factories, gas storages, and manufacturing processes that produce
or use toxic gases and to prevent accidents in advance.
GTD-1000Tx(2W) toxic gas detector is installed in areas with gas leak hazards and continuously monitors gas leak. It
displays measurements on LCD of the detector, converts and transmits data in DC 4~20 mA standard output signal. Also,
for DC 4~20 mA standard output, output signal transmission length between detector and receiver can be connected up
to 2,000 m. (When Cable CVVS or CVVSB 1.5sq and above is used.)
Body of GTD-1000Tx(2W) is made of Aluminum alloy and the gas sensor module is made of stainless steel. It consists
of a complete explosion-proof enclosure (Ex d IIC T6). This product can be installed in areas with potential combustible
gas leak and explosion hazards and internal structure consists of 1 PCB board with display part for measurements and
terminal part that outputs measurements (DC 4 - 20 mA) externally. External configuration consists of detector part that
monitors gas leak and cable inlets.
3.2. Mechanical Specifications
ITEMS SPECIFICATION
Explosion Proof type Explosion-proof enclosure
Dimension 136(W) × 166(H) × 95 (D) mm
Weight including Sensor App. 1.5kg
Mounting type Wall mount
Mounting Holes Ø 7 ±0.1
Cable inlet 3/4"PF(1/2"or3/4"NPT)
Body material Transmitter aluminum alloy
Sensor Stainless Steel (STS316)
2. Conguration
1. Overview
GTD-1000Tx(2W)
Instruction Manual
[Figure 1. GTD-1000Tx(2W) Overview]
Gas
Sensor Module
(GSA860EX)
Main Board
(Transmitter)
VIN & 4-20mA
Analog
Signal Output
Transmitter enclosure
Safety Controller
(PLC or DCS)
GTD-1000Tx-2w Gas Detector
Hazardous Area (Filed) Safe Area
※Note1.Refertothemeasuredgaslistformeasuredgasesandtheirranges.Contactusforspecialgas.
3.1. Basic Specifications
ITEMS SPECIFICATION
Measuring Type Diffusion
Measuring Method Electro-Chemical Cell
Detectible Gas Toxic Gas)(Note1
Measuring Range Capable to display 000.0 ~ 9999 (Note 1)
Accuracy ≤±3%/FullRange
Zero Drift ≤2%/FullRange
Response Time Depends on Sensor Module.
Refer to Sensor Specification or Contact in case for Special Gas.
Approvals Classification KCs: Ex d llC T6
Basic Interface Analog 4-20mA current interface
Option Rain Cover
Warranty Transmitter 2Year
Sensor 1Year

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08_09
4. Name and Description of Each Part
3.3. Electrical Specifications (Standard Type)
ITEMS SPECIFICATION
Input Voltage(Standard)
※CustomersuppliedPSUmustmeet
requirements IEC1010-1 and CE
Marking requirements.
Absolute min:
Nominal:
Absolute max:
Ripple maximum allowed:
16V
24V
31V
1V pk-pk
Wattage Max. wattage:
Max. current:
0.5W @+24 VDC
22mA @+24 VDC
Analog output Current
0-20mA(500 ohms max load)
All readings ± 0.2mA
Measured-value signal:
4mA(Zero) to 20mA(Full Scale)
Fault:
0-100%LEL:
100-109%LEL:
Over110%LEL:
Maintenance:
3mA
4mA - 20mA
21.6mA
20mA - 21.4mA
3.5mA
Analog output current ripple & noise max ±20uA
Wiring requirement Power CVVS or CVVSB with shield
Cable Connection Length Analog 2500m
EMC Protection: Complies with EN50270
3.4. Environmental Specifications
ITEMS SPECIFICATION
Operation Temperature Transmitter -20to50℃
Sensor Refer to Sensor Specification
Storage Temperature Transmitter -20to50℃
Sensor Refer to Sensor Specification
Operation Humidity Transmitter 5to99%RH(Non-condensing)
Sensor Refer to Sensor Specification
Pressure Range 90 to 110KPa
Max. air velocity 6m/s
3. Specication
GTD-1000Tx(2W)
Instruction Manual
4.1. Components
[Figure 2. GTD-1000Tx(2W) Components]
NO NAME DESCRIPTIONS
1Detector housing body Protects PCB Board built in Sensor and Housing from external environmental change and shock.
2Main PCB Amplifies fine outputs generated from Sensor Element and It transmits by converting into DC
standard output.
3Internal Ground It must be grounded to inside of detector for protection from external noise or strong electric field.
4External Ground It must be grounded to outside of detector for protection from external noise or strong electric field.
5Detector Housing Cover Protects PCB Board built in Sensor and Housing from external environmental change and shock.
6Mount Hole Hole to fix the gas detector on external wall or other installation sites.
7Conduit Connection It is supplied for inlet of power supply and measurement outpu tsignal for the detector during
installation.Forcableinlet,PForNPT3/4",1/2"areprepared
8Zero / Span VR It is variable resistance that adjusts zero and span during calibration

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10_11
4. Name and Description of Each Part
GTD-1000Tx(2W)
Instruction Manual
NO NAME DESCRIPTIONS
9Sensor Terminal CN5 is Sensor Connection Terminal. (Blue ,Red, White,)
10 Set screw (M4-L6) It is a set screw that prevents cover opening from the detector housing body.
11 Sensor head It protects the gas sensor from external shock, dusts, and rainwater, etc.
12 Sensor It is a site that detects actual gas leak. It converts the amount of gas leak into electrical signal and
transmits to the Main PCB.
[Table 1. GTD-1000Tx(2W) Components Description]
[Figure 3. Slotted Set Screw]
5. Installation
■ Itisprohibitedforanindividual,otherthananapproveduseroratechnicianresponsibleforinstallationandrepair
from the head office, to install a gas leak sensor on site or open the cover of the installed gas leak detector and
manipulate it. This may cause serious loss of life and property from fire, explosion, and etc. In addition, please check
whether there is any remaining explosive gas or combustible material in the surroundings. Power must be turned off
before performing work.
5.1. Detachment of Housing Cover
■Turntheslottedsetscrew(M4x1ea)fixingthecoverpartofmainbody3~4tunscounterclockwise(ccw)usingahex
wrench (M2) then turn the cover of gas leak detector ccw to detach the cover.

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12_13
GTD-1000Tx(2W)
Instruction Manual 5. Installation 5. Installation
[Figure 4. Main PCB Key Layout]
5.2. Main PCB Configuration
■Afterdetachingthecover,theMainPCBterminallayoutappearsasshowninthefigurebelow.
[Table 2. Main PCB Key Part Description]
No NAME DESCRIPTION
1CN6 Program download Connector
2CN2 Display Module Connector for Status Display
3CN5 Sensor Connector
4CN4 Program download Connector
5VR2 Potentiometer for ZERO Output Adjustment
6VR1 Potentiometer for SPAN Output Adjustment
7SW1 Sensor Configuration Switch1(Factory Setting)
8SW2 Sensor Configuration Switch2(Factory Setting)
9CN1 Power & Output Signal Terminal
5.3. Power and Signal Terminal Configuration
■Afterdisassemblingdisplayparts,thereisaterminalblockintheMainPCBasshowninthefigurebelow.Holding
it with hands and pulling towards ceiling detaches it from the Main PCB.
■Loosen5terminalfixingscrewslocatedattoppartofdetachedterminalblockCN8(VIS,+,mA,-,ETH)Connectorby
 turningcounter-clockwiseusingaΘdriver.ConnectDC18~24Vpowerto+,and-thenconnectsignalcabletomA.
Tighten 5 terminal fixing screws clockwise (cw) so that terminal does not leave the track then insert Main PCB as the
same condition before disassembly.
[Figure 5. CN1 Terminal Configuration]
■UseCVVSorCVVSB2.0sq↑ShieldCableforterminalconfiguration.
[Table 3. CN1 Terminal Detailed Description]
NO PIN NAME DESCRIPTION
1+V +24V / POWER (+)
2-V 4~20mA Source Out
3ET EARTH

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GTD-1000Tx(2W)
Instruction Manual 5. Installation5. Installation
5.4. Method to Connect to External Control Unit
■Connect18V~31VDCoperationpowertoCN1(+,mA,-,ET)ConnectionTerminalofthegasdetectorthen
connect a device that can receive 4~20 mA signals to mA.
[Figure 6. External Control Unit Connection Method]
5.5. Installation Cable Length
■ThemaximumlengthbetweenGTD-1000Tx(2W)andpowersupplyisdecidedbywirespecification.
■Max.InstallationLength=VMAXDROP÷IMAX÷WIRER/m÷2
 ·VMAXDROP:MaximumPowerLoopVoltageDrop(=PowerSupplyvoltage
- min operating voltage)
 ·IMAX:Max.CurrentofGTD-1000Tx
 ·WIRER/m:Theresistanceofthewire(ohms/metervalueavailableinwiremanufacturer'sspecificationdatasheet)
■Exampleofinstallationlengthsusing24Vpowersupplyand16AWGisasfollows.
 ·GTD-1000Tx(2W)minimumoperatingvoltage=16Vdc
 ·VMAXDROP=24-16-5.5=2.5V
 ·IMAX=0.022A(22mA)
 ·2.5÷0.022÷0.01318÷2=4,310.9m≒4310m
[Figure 7. Calculation of GTD-1000Tx(2W) Installation Cable Length]
■Powercableinstallationforeachcabletypeisasshowninthetablebelow.
[Table 4. GTD- 1000Tx Power Cable Installation Length]
AWG mm2 COPPER RESISTANCE(ohms/m) METERS
12 3.31 0.00521 10905
14 2.08 0.00828 6862
16 1.31 0.01318 4310
18 0.82 0.02095 2712
20 0.518 0.0333 1706

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GTD-1000Tx(2W)
Instruction Manual 6. Calibration and Maintenance
■Stabilizationtimeof30minfromtheinitialsupplyofoperationpowertothesensorforthestabilizationofthesensor.
Calibration and test must be performed approx. 30 min after when the sensor has been stabilized.
6.1. 4-20mA Output Diagnosis
■Inastatewheregasdetectorandreceiverareconnected,whenthe
voltage is measured by connecting a multimeter to TP3 (+mA) and
TP2 (-mA) of AMP PCB, current of 4~20 mA can be confirmed.
6.2. 4mA Adjustment (ZERO Calibration)
■Checkconnectionbetweenterminalblock'CN1'andthereceiver
then confirm voltage input of 18 ~ 31 V.
■ChangeDMMtocurrentmeasuringmode,thenconnect(+)and(-)terminalsorDMMtoTP3(+mA)andTP2(-mA)
of AMP PCB, respectively.
■Injectcleanairor100%nitrogenataflowrateof500mL/minfor2min.
■Whenzerogasisinjected,4mAcurrentisoutputted.Iftheoutputisnot4mA,adjustthepotentiometer'VR2(SPAN)'
left and right to set 12 mA.
■Whenitisrotatedclockwise,thecurrentincreasesandtheoppositedecreasesthecurrent.
6.3. SPAN Calibration
■Checkconnectionbetweenterminalblock'CN1'andthereceiverthenconfirmvoltageinputof18~31V.
■ChangeDMMtocurrentmeasuringmode,thenconnect(+)and(-)terminalsorDMMtoTP5(+mA)andTP6(-mA)
of AMP PCB, respectively.
■Injectthestandardgas(airbalance)ataflowrateof500mL/minfor2min.
■Currentoutputproportionaltothestandardgasinjectedtothesensorisdisplayed.Iftheoutputisnotcorrectadjust
 thepotentiometer'VR1(SPAN'leftandrighttocalibratecurrentoutput.
■Whenitisrotatedclockwise,thecurrentincreasesandtheoppositedecreasesthecurrent.
[Figure 8. 4-20mA Output Test Terminal]
6. Calibration and Maintenance
[Figure 9. ZERO Calibration related Parts]
■Ex.)OutputCalculationMethodfor
Range : 0-150ppm Calibration gas : 100ppm NH3/N2balance
Output signal : 4-20mA Test point signal: TP3, TP2
■Ex.)OutputCalculationMethodfor
Range : 0-150ppm Standard Gas : 100ppm
Output signal : 4-20mA Test point signal TP3, TP2
(200 - 40) × 100ppm NH3(Standard Gas) +40=147=14.7mA
150ppm NH3(Measuring Range)
(200 - 40) × 100ppm CO (Standard Gas) +40=147=14.7mA
150ppm CO (Measuring Range)
[Figure 10. Span Calibration related Parts]

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18_19
GTD-1000Tx(2W)
Instruction Manual 8. Precautions before Installation7. Drawings and Dimensions
[Figure 11. GTD-1000Tx(2W) Drawing]
8.1. Selecting a Place for Installation (Occupational Health & Safety Data)
A gas leak detector alarm shall be installed in the following places.
■ Around chemical equipment and accessories that have concerns of gas leak. This includes compressors, valves, reactors,
pipe joints, etc. installed inside and outside of a building that handle combustible and toxic materials.
■Placesthatareeasierforgasestostaysuchasareasaroundmanufacturingfacilitieswithignitionsourceslikeheating
furnace, etc,
■Areasaroundequipmentforfillingcombustibleandtoxicmaterials.
■Substations,panelrooms,controlrooms,andetc.locatedwithinexplosivearea.
■Otherareasthatareeasierforgasestostay.
8.2. Selecting a Site for Installation (High-Pressure Gas Safety Act Data)
Gas detector of gas leak detector alarm must be installed as close to the areas with concerns of gas leakage as possible.
However, for areas where direct gas leakage is not expected but are easier for leaked gas to stay, the detector must be
installed at the point 1 of the following.
■ Gas leak detector alarm installed outside a building shall be installed at points where gas is likely to stay in consideration
to wind direction, wind speed, specific gravity of gas, etc.
■Gasleakdetectoralarminstalledinsideabuildingshallbeinstallednearthefloorwhenthespecificgravityofgasis
heavier than air and near ventilation of ceiling when it is lighter than air.
■Alarmforgasleakdetectoralarmmustbeinstalledatsiteswherethegasdetectorisinstalledandworkersarepresent.
8.3. Precautions during Installation
Avoid areas with electrical barriers such as rain water, etc. It is recommended to be installed in areas that are easier to
work in since regular maintenance is needed. Avoid areas with vibration or shock since they can affect output values.
Sensor part must be installed towards the direction of gravity.
■Thisequipmenthasexplosion-proofconstructionforinternalpressureandbelongstoGROUPIIforgasandvaporin
general work sites and chemical plants. It can be used in ZONE 1 (ONE) and ZONE 2 (TWO) hazardous sites.
■Allowabletemperatureis85Corbelow,whichcorrespondstoT6.

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20_21
GTD-1000Tx(2W)
Instruction Manual 9. Revision History8. Precautions before Installation
■Usewithsurroundingtemperatureinarangeof-20C~50C.
■InstallationHeight:1,000Mbelowsealevel
■RelativeHumidity:5%~99%
■InstallationSite:IndoorandOutdoor
■ExplosionIgnitionGradefortheGasorVapor:ExdIICT6
■Duringwiringwork,useexplosion-proofcableglandatcableinletortightlysealcableconduitduringmetalcable
wiring construction to prevent spread of flames in case of explosion or movement of gas, etc. through the cable
conduit within 50 mm. All materials including materials used for sealing of unused inlets must have safety certificates!
■Whenconnectingtheequipmentwithcable,screwthreadmustbetightened5threadsormore.
■Workinconditionssatisfyingother[StandardsforSelection,Installation,andMaintenance,etc.ofExplosion-proof
Electric Machine and Equipment Wiring, etc. at Work Site]
■Allmaterialsusedforcableinletsuchascableglandandsealingfitting,etc.andusedassealingunusedinlets
must pass the verification!
VERSION CONTENTS DATE
0.0 * Manual Initial Revision 2013.06.09
1.0 * Gas calibration method changed 2014.09.19
2.0 * mA Calibration Mode added 2014.10.24
3.0 * Changed Font 2014.12.26
4.0 * Separated Factory mode manual 2016.09.27
5.0 *ChangedExplosion-proofEquipmentCableEntryInstallationRegulation45cm→50mm 2017.01.20
[Figure 12. High-Pressure Packing Type] [Figure 13. Y Sealing Compound]
Cable Cable
Inside Inside
Outside Outside
Lead-in unit connector
Lead-in unit connector
Charging compound
Cable-fixing device
Pipe for piping
Cable-fixing device
Sealing ring
Sealing
ring
Connector
Pipe for piping
Compressed
element
Connector for fixing
compressed element