GASTRON GTD-3000ExW User manual

GTD-3000ExW
Instruction Manual
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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]
www.gastron.com

Gas & Flame
Detection System
GTD-3000ExW
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.
( * See No. 13 of KOSHA GUIDE : P-135-2013 / 8.3 paragraph on qualification and calibration)
■ 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.
* KOSHA GUIDE : P-135/6-2018
Calibration should be executed at the periods required by the manufacturer, and should be executed
every quarter unless there are separate calibration periods.

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04_05
ContentsContents
GTD-3000ExW
Instruction Manual
7. System Mode ······························································································································································ 23
7.1. PROGRAM MODE ············································································································································· 23
7.2. CALIBRATION MODE ········································································································································· 24
7.2.1. Zero Calibration ······································································································································· 24
7.2.2. Span Calibration ······································································································································ 25
7.3. ALARM Mode ···················································································································································· 26
8. Troubleshooting ·························································································································································· 28
8.1. Fault List ····························································································································································· 28
8.2. Recovery List······················································································································································· 28
9. Interface Configuration ············································································································································· 29
9.1. MODBUS RS485 ················································································································································ 29
9.1.1. Interface setting ······································································································································ 29
9.1.2. MODBUS RS485 Register map ··············································································································· 29
10. Drawings and Dimensions ········································································································································ 30
10.1. Standard Type ···················································································································································· 30
10.2. Warning Light GTL-100 ····································································································································· 31
10.3. During Warning Light Assembly ························································································································ 32
11. Precautions before Installation ································································································································ 33
11.1. Selecting a Place for Installation (Occupation Safety and Health Act Data) ···················································· 33
11.2. Selecting a Site for Installation (High-Pressure Gas Safety Control Act Data) ················································· 33
11.3. Precautions during Installation ·························································································································· 33
12. Revision History ··························································································································································· 35
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
4.2. Lamp Function Description ································································································································ 11
5. Installation ···································································································································································· 12
5.1. Detachment of Housing Cover ························································································································· 12
5.2. Main PCB Configuration ···································································································································· 13
5.3. Power & 4-20 mA Terminal Configuration ······································································································ 14
5.3.1. Wiring for 4~20mA Source Operation Type ························································································· 15
5.3.2. Wiring for 4~20mA Sink Operation Type ······························································································ 15
5.4. Relay and Network Terminal Configuration ····································································································· 16
5.4.1. Terminal Configuration ·························································································································· 16
5.4.2. Relay Mode Configuration ····················································································································· 17
5.4.3. RS485 MODBUS Setting ························································································································ 17
5.5. Installation Cable Length ·································································································································· 18
6. Detector Operation Flow ·········································································································································· 19
6.1. Initial Operation Status (Power On) ·················································································································· 19
6.2. Measuring Mode ··············································································································································· 19
6.3. Operation Flow ·················································································································································· 20
6.4. Menu Configuration Table ································································································································ 21

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06_07
3. Specication
GTD-3000ExW flammable gas detector has been developed to detect gas leaked from industrial sites and various
flammable gases generated from factories, gas storages, and manufacturing processes that produce or use flammable
gases and to prevent accidents in advance. GTD-3000ExW flammable gas detector is installed in areas with gas leak
hazards and continuously monitors gas leak. It displays measurements on built-in LCD of the detector, delivers alarm
status by visual and audible signal using a warning light, converts and transmits data in Analog 4~20 mA standard output
signal. Also, for Analog 4~20 mA standard output, output signal transmission length between detector and receiver can
be connected up to 2,500 m. (When Cable CVVS or CVVSB 1.5sq and higher is used.) GTD-3000ExW flammable gas
detector must be used at a height below 1,000 m above sea level.
Body of GTD-3000ExW 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 combustible gas leak and
explosion hazards. It has built-in display (LCD or OLED) on the detector to display gas leak status at installed site. Internal
configuration consists of display part that indicates measurements, terminal part that output measurements (Analog
4~20 mA) externally, and a PCB board. External configuration consists of sensor that detects gas leak, cable inlet, and
high-pressure explosion proof small warning light made of SUS materials. It uses magnet-bar outside the main body of
detector enabling calibration from the outside of the detector, thus, maintenance is convenient.
3.1. Basic Specifications
ITEMS SPECIFICATION
Measuring Type Diffusion
Measuring Value Display
- LCD or OLED Display
- Green, Red, Yellow LED
- Sound Output(95dB)
Measuring Method
- Catalytic Cell
- Thermal Conductivity Cell
- Heated-semiconductor Cell
Detectible Gas Combustible Gas
Measuring Range 0~100% LEL
Accuracy ≤ ±3% / Full Range
Zero Drift ≤ 2% / Full Range
Response Time 90% of full Scale in less than 15 sec
Approvals Classification KCs: Ex d llC T6,T5,T4
Basic Interface Analog 4-20mA current interface
HART Interface HART REV7(Option)
Option HART Board
MODBUS RS485 Board
Warranty Transmitter & Lamp 2Year
Sensor 1Year
3.2. Mechanical Specifications
ITEMS SPECIFICATION
Explosion Proof type Explosion-proof enclosure
Dimension - Transmitter: 156(W) × 322(H) × 110(D) mm
- Lamp: 83.8(W) × 85(H) × 48(D) mm
Weight including Sensor App. 2.5kg
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)
Lamp Cover PC
Lamp Body Stainless Steel (SUS304)
2. Conguration
1. Overview
GTD-3000ExW
Instruction Manual
[Figure 1. GTD-3000ExW Overview]
Gas
Sensor Module
(GSA860EX)
Main Board
(Transmitter)
+24V DC
4-20mA Analog
Signal Output
Display Board
(User Interface)
Transmitter enclosure
Safety Power Supply Unit
(24VDC)
Safety Controller
(PLC or DCS)
Alarm
Signalling
GTD-3000Ex Gas Detector
Hazardous Area (Filed) Safe Area

[Figure 2. GTD-3000ExW Components]
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08_09
4. Name and Description of Each Part
4.1. Components3.3. 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:
18V
24V
31V
1V pk-pk
Wattage Max. wattage:
Max. current:
5.5W @+24 VDC
280mA @+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:
0mA
4mA - 20mA
20mA - 21.4mA
22mA
3mA
Analog output current ripple & noise max ±20uA
Relay contact Alarm1, Alarm2, Fault Relay
Rated 1.0 A @ 30VDC or 0.5 A @ 125 VAC
Wiring requirement
Power CVVS or CVVSB with shield
Analog CVVS or CVVSB with shield
RS485 STP(Shielded Twisted Pair)
Cable Connection Length Analog 2500m
RS485 1000m
EMC Protection: Complies with EN50270
NO NAME DESCRIPTIONS
1Housing Protects Sensor and PCB Board built in the Housing from external environmental change and shock.
2Main PCB
It amplifies output signal from the sensor and converts and send it as DC 4~20 mA standard output.
Isolation RS-485 network and alarm relay contact signals are outputted. Also, it sends data for the display.
3Display PCB It displays data received from main PCB on LCD or OLED and displays the current event status with
power lamp, alarm lamp, trouble lamp.
4Power/Signal Terminal CN1 consists DC18-24 V power supply and DC 4~20 mA standard output connection terminal (VISO,
+24V, mA,-, ETH).
5Alarm signal Terminal CN10 is alarm signal connection terminal, which outputs trouble, alarm1, alarm2 relay contacts.
3.4. Environmental Specifications
ITEMS SPECIFICATION
Operation Temperature Transmitter -20 to 60 ℃
Sensor Refer to Sensor Specification
Storage Temperature Transmitter -20 to 60 ℃
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-3000ExW
Instruction Manual

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10_11
4. Name and Description of Each Part
NO NAME DESCRIPTIONS
6RS-485 signal terminal CN9 is Isolation RS-485 network signal connection terminal (A, B).
7Sensor terminal CN1 is Sensor Connection Terminal. (RD , WH , BK , BE)
8Power lamp When power is on, lamp lights on.
9Trouble lamp It lights on when there is a fault in the circuit or sensor sensitivity, etc.
10 Alarm1 lamp It lights on when gas leaks and it exceeds Alarm1 level.
11 Alarm2 lamp It lights on when gas leaks and it exceeds Alarm2 level.
12 Function key
During parameter setting, it changes to program mode when it is contacted with magnet-bar for
2 sec or longer. (Program mode, Calibration mode, Test mode, etc.) Also, it is used to enter and
set an arbitrary data.
13 Reset key To cancel or return to the previous status during Parameter setting, use the Magnet Bar and
touch once. (Each touch returns to the previous status by one unit.
14 ↑(Up) key During conversion of mode or number, use the Magnet-Bar and touch once. Each touch converts
or changes one level. (Converts to the next level)
15 ↓(Down) key During conversion of mode or number, use the Magnet-Bar and touch once. Each touch converts
or increases displayed value by one unit. (Converts to the previous level)
16 External earth - It is an external ground for protection from external noise or strong electric field.
- Use a conductor that is 4 mm or longer when coupling ground line.
17 Mount hole Hole to fix the gas detector on external wall or other installation sites.
18 Cover fixed screw(M4) After assembling detector housing body and cover, they are fixed with hex lens bolt to prevent
detachment by external shock.
19 Sensor thread It is a mounting for gas sensor (detector).
20 Cable inlet It is provided to supply power and inlet for measured output signal of the gas detector during
installation work. As default, PF 3/4" is provided.
21 Internal earth
- It must be grounded to inside of detector for protection from external noise or strong electric
field.
- Use a conductor that is 4 mm or longer when coupling ground line.
22 RS-485 Module /
HART Module (Option 사양)
It is a connector for Isolation Type RS-485 and HART network modules to communicate with PC
or PLC. To run RS-485 network, network address must be configured. Default is 1. To run HART
network, Polling-Address and Tag No., etc. must be configured.
23
Relay Contact
Type Selection
Jumper
It is constructed to select A or B contact.
When it is not in ENERGIZER MODE, it operates in A contact (Normal Open) mode or B contact
(Normal Close) mode when Jumper is connected to a part marked as A silk or B silk, respectively.
In contrast, when it is in ENERGIZER MODE, connecting Jumper to A operates in B contact mode
and connecting Jumper to B operates in A contact mode.
24 Warning Light Connector It is a connector connected when a warning light is used. (Option)
25 Program Connector It is a connector for downloading the program for the product.
26 FRONT CASE It is an explosion-proof case made of explosion-proof plastic and emits LED light externally
through transparent window.
27 CASE RING It serves as a cover to prevent deviation of front case.
28 SEXANGLE BOLT It serves to prevent deviation after case ring assembly and is fixed by mood bolt.
29 CASE BODY It is the main body that protects internal buzzer and other parts by body.
NO NAME DESCRIPTIONS
30 BUZZER It receives signal upon an event of error and generates warning sound.
31 FIXED RING It prevents sintering filter from escaping upon external shock.
32 FLAME ARRESTER It blocks flow in of dust, debris, water, gas and delivers warning sound from the buzzer to
outside.
33 ARREST CAP It protects sinter filter from external shock.
34 LED COVER It is a joint for LED PCB ASS'Y and covered with molding.
35 LED PCB ASS"Y It is a multi-color LED that displays status.
36 NUT It serves to fix parts to the compliment part.
37 SHAFT BODY It serves to fix parts to the compliment part.
38 CABLE WIRE It supplies power and transmits data.
[Table 1. GTD-3000ExW Transmitter Components Description]
4. Name and Description of Each Part
GTD-3000ExW
Instruction Manual
4.2. LAMP Function Description
■ In normal status, green LED lights on and buzzer does not ring.
■ When Alarm-1 signal is received, red LED flickers in 1 sec interval and buzzer rings in 1 sec interval.
■ When Alarm-2 signal is received, red LED lights on and buzzer rings continuously.
■ When Trouble signal is received, yellow LED lights on and buzzer does not ring.

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5. Installation5. Installation
GTD-3000ExW
Instruction Manual
5.1. Detachment of Housing Cover
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 detector 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.
[Figure 4. Display Part Detaching Method]
■ After detaching the cover, disassemble the display parts
as below.
① Push in left and right fixing rings located on front
side of LCD at the same time.
② While pushing, pull the display parts towards the
front to detach from gas detector body.
③ After detaching the display parts, the Main PCB is
installed at the bottom part of the detector body.
5.2. Main PCB Configuration
■ After detaching the display parts, the Main PCB terminal layout appears as shown in the figure below.
[Table 2. Main PCB Key Part Description]
No NAME DESCRIPTION
1CN11 Power & Output Signal Terminal
2CN10 Alarm & Fault Relay Terminal
3CN9 RS485 Terminal
4J1 4~20mA Source / Sink Selection Jumper ( ON: Source Type, OFF: Sink Type)
5CN4 Display LCD or OLED Connector
6CN1 Sensor Connector
7CN5 Program download Connector
8D1 Status LED (Flashes in 1 sec interval during normal operation)
9OC1, OC2, OC3 HART Option Board Connector
10 CN3 Warning light (GTL-100) Interface Connector
[Figure 5. Main PCB Terminal Layout]
■ Using OC1, OC2, and OC3 shown in the layout above, HART Option RS-485 MODBUS board can be attached.
3ØScrew holes located at top left of option board are used for fixing.
[Figure 3. Slotted Set Screw]
■ <Warning - Do not open when electical current is
flowing>
■ Turn the slotted set screw (M4 x 1ea) fixing the
cover part of main body 3~4 turns counter
clockwise (ccw) using a hex wrench (M2) then
turn the cover of gas leak detector ccw to
detach the cover. When the cover is detached,
LCD appears.

5.3. Power and 4-20mA Terminal Configuration
■ <Warning - Turn off power before connecting power terminal>
■ After detaching the display part, 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 (VISO, +V, mA, -V, ETH)
Connector by turning counter-clockwise using a Θ driver. Connect DC 24 V power to +, and - then connect
signal cable to mA. Tighten 5 terminal fixing screws clockwise so that terminal does not escape the track then
insert Main PCB as the same condition before disassembly.
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5. Installation5. Installation
GTD-3000ExW
Instruction Manual
No PCB Silk PIN NAME DESCRIPTION
4~20mA Source Drive (J1 Jumper ON) 4~20mA Sink Drive (J1 Jumper OFF)
1VISO VIS N.C 4~20mA Sink In(+)
2+24V ++24V / POWER (+)
3mA mA 4~20mA Source Out 4~20mA Sink Out(-)
4GND -GND / POWER (-)
5ETH ET EARTH
[Table 3. CN8 Terminal Detailed Description]
[Figure 6. CN11 Terminal Configuration]
■ Use CVVS or CVVSB 2.0sq↑ Shield Cable for terminal configuration.
■ To connect 4 Pin terminal from the existing old GTD-3000ExW model, connect terminals in reference to pin #2,
which is +24V.
5.3.1. 4~20mA Source Operation Type Wiring Diagram
5.3.2. Wiring for 4~20mA Sink Operation Type
■ Connect 4-20 mA signal terminal at PLC side to 'mA'
of GTD-3000ExW. GND terminal is used in common
with power. Then, turn on the J1 jumper.
■ HART Communicator can only be used in models
using HART Option board.
■ Connect (+) and (-) terminals for 4-20 mA sink
output at PLC side to VISO terminal and 'mA' terminal,
respectively. Then, turn off the J1 jumper.
■ HART Communicator can only be used in models
using HART Option board.
[Figure 7. 4-20mA Source Configuration]
[Figure 8. 4-20mA Sink Configuration]
Terminal Set Screw

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5. Installation5. Installation
GTD-3000ExW
Instruction Manual
5.4.1. Terminal Configuration
5.4. Relay and Network Terminal Configuration
TER. NO. PIN NO. Terminal Name Description
CN10
1TRB OUT Trouble RELAY OUTPUT Terminal. Output mode is decided by J2 Jumper setting.
2TRB COM TROUBLE RELAY COMMON Terminal
3AL1 OUT ALARM1 RELAY OUTPUT Terminal. Output mode is decided by J3 Jumper setting.
4AL1 COM ALARM1 RELAY COMMON Terminal
5AL2 OUT ALARM2 RELAY OUTPUT Terminal. Output mode is decided by J4 Jumper setting.
6AL2 COM ALARM2 RELAY COMMON Terminal
CN9 7RS485 A RS485 A Terminal
8RS485 B RS485 B Terminal
[Figure 10. Relay and RS485 Terminal]
[Table 4. Relay & RS485 Terminal Description]
■ Relay of GTC-3000ExW operates in 2 types of method; Normal open and Normal close. The Jumper is
constructed to configure relay operation method at the Main PCB and operating setting is as follows.
TER. NO. PIN NO. Terminal Name MODE Setting
CN10
1TRB OUT J2 A-C Connection: A Contact ( Normal Open )
J2 B-C Connection: B Contact ( Normal Close )
2TRB COM
3AL1 OUT J3 A-C Connection: A Contact ( Normal Open )
J3 B-C Connection: B Contact ( Normal Close )
4AL1 COM
5AL2 OUT J4 A-C Connection: A Contact ( Normal Open )
J4 B-C Connection: B Contact ( Normal Close )
6AL2 COM
[Table 5. Relay Mode Setting]
5.4.3. RS485 MODBUS Setting
■ MODBUS of GTC-3000ExW is optional and is connectes to the receiver as shown below.
TER. NO. PIN NO. Terminal Name Receiver Terminal Name Notes
CN9 7485A ‘TRXD+' or 'A' or 'P'
8485B ‘TRXD- or 'B' or 'N'
[Table 6. RS485 Terminal Description]
5.4.2. Relay Mode Configuration
[Figure 11. Relay Mode Setting]
[Figure 9. 4-20mA 3Wire Sink Configuration]
■ Connect (+) and (-) terminals for 4-20 mA sink
output at PLC side to VISO terminal and power
(24V DC) (-) terminal, respectively.
Connect‘mA’terminal of GTD-3000Ex to‘GND’
terminal. Then, turn off the J1 Jumper.
5.3.3. Wiring for 4~20mA 3Wire Sink Operation Type

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GTD-3000ExW
Instruction Manual 6. Detector Operation Flow5. Installation
5.5. Installation Cable Length
[Figure12. Calculation of GTD-3000ExW Installation Cable Length]
■ The maximum length between GTD-3000ExW 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-3000ExW
·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-3000ExW minimum operating voltage = 18 Vdc
·VMAXDROP = 24 - 18 = 6V
·IAMX = 0.28A(280mA)
·6 / 0.28 / 0.01318 / 2 = 812.920m = 813m
[Table 7. GTD- 3000ExW Power Cable Installation Length]
AWG mm
2
COPPER RESISTANCE(ohms/m) METERS
12 3.31 0.00521 2056
14 2.08 0.00828 1294
16 1.31 0.01318 813
18 0.82 0.02095 511
20 0.518 0.0333 322
■ Power cable installation for each cable type is as shown in the table below.
6.1. Initial Operation Status (Power On)
■ After wiring to power terminal at the top of Main PCB board then supply power, the following contents are displayed on LCD.
Approx. 30 min of stabilization of time is needed from the initial supply of operation power and it starts to operate normally after
sufficient stabilization.
GTD-3000
[Ver X.XX]
- When the power turns on, model name is displayed on the first row and firmware version
- of the detector is displayed on the second row of LCD (OLED).
** SELFTEST **
[>>>>>>> 0179] - Self test is performed for 3 min '>' symbol in the second row shows the progress.
[ COMB.]
[ 0]%LEL - It runs as below when it is normal and in gas measuring mode.
- Gas name is displayed on the first row and the current measurement and unit is displayed on the
- second row.
※ During HART network, '*' is displayed on the left of the first row.
※ ENG. When the mode is on, '<' is displayed on the left of the second row.
※ During 485 network, '*' is displayed on the right of the first row
* [ COMB.]
< 0]%LEL
[ COMB.]*A01
[ 0]%LEL
[ COMB.]
[ OVER]%LEL
- When gas measurement larger than 10% of set high scale value, 'OVER' displays in 1 sec interval.
- At this time, 4~20 mA runs as 22 mA.
[ COMB.]
[ UNDER]%LEL
- When gas measurement smaller than -10%, "UNDER" displays in 1 sec interval and 4~20 mA
- runs at 0 mA.
※ The following function only runs when UNDER is on.
[FAULT- 01]
SENSOR EMPTY
- When trouble occurs in the device, it displays fault number and message.
- At this time, 4~20 mA runs at 0 mA. (2 mA when HART is used.)
- It is a mode that displays when Fault #-1 sensor on the left is not equipped.
6.2. Measuring Mode
■ After power on, when there is no error from "SELF TEST", it automatically enters Measuring Mode.
0.28A

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GTD-3000ExW
Instruction Manual
6.3. Operation Flow
[Figure 12. GTD-3000ExW Mode Configuration]
[Table 8. Operation Key Description]
ITEM NAME DESCRIPTION
FUNC Function key Detector Mode Setting Entry Function (Insert Magnetic-bar for 2 sec or longer in measuring mode)
Function to enter the next stage of Level2 and to save the setting
RESET Reset key Move to the previous stage from the level entered.
↑Up key Next level mode that is configured in LEVEL1 and Change in Level2 setting Plus
↓Down key Next level mode that is configured in LEVEL1 and Change in Level2 setting Minus
■ Operation keys for detector system mode are defined as below.
6.4. Menu Configuration Table
LEVEL1 LEVEL2 DEFAULT
NAME PARAMETER
PROGRAMMABLE
MODE
GAS TYPE [DEFINE/USERG.] DEFINE
GAS SELECT Factory Set COMB.
UNIT SELECT %/%LEL/PPM/PPB %LEL
DECIMAL POINT 0.100/1.00/10.0/100 100
HIGH SCALE 1~9999 100
PASSWORD 00~99 00
CALIBRATION
MODE
CALIBRATION
[ZERO]
ZERO CALIBRATION
[NO, YES] [NO]
ZERO GAS
[ 0]
ZERO PROCESSING
[SUCCESS / FAIL]
CALIBRATION DATA
[ 0 / FAIL]
CALIBRATION
[SPAN]
SPAN CALIBRATION
[NO, YES] [NO]
SPAN GAS VALUE
[ 0]
SPAN SET VALUE
[50 / FAIL] 50
SPAN PROCESSING
[SUCCESS / FAIL ]
CALIBRATION DATA
[ 0]
ALARM PROGRAM
MODE
ALARM OPERATING [AUTO/MANUAL] AUTO
ALARM RELAY TYPE DE-ENERGIZED/ENERGIZED DE-ENERGIZED
FAULT RELAY TYPE DE-ENERGIZED/ENERGIZED DE-ENERGIZED
ALARM1 TYPE SEL.
(ALARM1 TYPE SELECT) [INCREASE/ DECREASE] INCREASE
ALARM1 LEVEL ADJ
(ALARM1 LEVEL ADJUST) [ 1~Full Scale] 20
ALARM1 DEAD BAND [ 0.0~ Full Scale의 10% ] 0.0
ALARM1 TIME SET [0~60] SEC 1
ALARM1 RELAY CTL
(ALARM1 RELAY CONTROL) [ON / OFF] ON
6. Detector Operation Flow6. Detector Operation Flow
■ After power on, it goes through self-test then enters Measuring Mode. Here, by operating front keys, you can go to
internal System Mode.
■ Timeout for Level1 and Level2 are 10 sec. It is set to 1 h for Level2 Calibration and Test Mode.
■ When "RESET" key contacts at Program Mode Screen, it returns to Measuring Mode. When "RESET" key contacts
at each Program Setting Screen, it returns to the parent step.

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6. Detector Operation Flow
GTD-3000ExW
Instruction Manual
[Table 9. Menu Configuration Table]
LEVEL1 LEVEL2 DEFAULT
NAME PARAMETER
ALARM PROGRAM
MODE
ALARM2 TYPE SEL.
(ALARM2 TYPE SELECT) [INCREASE/ DECREASE] INCREASE
ALARM2 LEVEL ADJ
(ALARM2 LEVEL ADJUST) [ 1~Full Scale] 40
ALARM2 DEAD BAND [ 0.0~ 10% of Full Scale ]% FS 0.0
ALARM2 TIME SET [0~60] SEC 1
ALARM2 RELAY CTL
(ALARM2 RELAY CONTROL) [ON / OFF] ON
SENSOR MODE FACTORY Mode
MAINTENANCE MODE FACTORY Mode
485 MODBUS MODE FACTORY Mode
DEVICE MODE FACTORY Mode
VERSION MODE FACTORY Mode
TEST MODE FACTORY Mode
SYSTEM MODE FACTORY Mode
7.1. PROGRAM MODE
PASSWORD
[**]
- Contacting "FUNC" key with the Magnet-bar for 2 sec or longer in Measuring Mode enters Password mode.
- After setting Password using "↑" or "↓" key, contact "FUNC" key.
PROGRMAMMABLE
MODE
- If password is correct, it enters Program mode.
- By contacting "↑" or "↓" key, mode changes in defined order.
- (PROGRAMMABLE->CALIABRATION->ALARM->SENSOR ->MAINTENANCE->485 MODBUS->DEVICE->
- VERSION->TEST->SYSTEM)
GAS TYPE
[ DEFINE ]
- Mode that sets gas name type and contacting "↑" or "↓" key changes gas type. (DEFIN. / USERG.)
- DEFINE is selected when a built-in gas name is used. USERG. Is selected to define the gas name
- directly by a user.
- When a desired gas type is displayed, contact "FUNC" key to set the gas name and enter Program Mode.
GAS SEL
[ COMB. ]
- Mode that sets gas name name and contacting "↑" or "↓" key changes gas name.
- When gas type is set to DEFIN., built-in gas names can be selected for use. When it is set to USER,
- the user shall set gas name using 6 character for use. Characters allowed for use are number, capital
- Alphabet, space, and period. When position is moved by setting characters, a cursor in black box shape
- appears as shown in the figure on left.
USER GAS
[■ ]
UNIT SELECT
[ %LEL ]
- Mode that sets gas measuring unit and contacting "↑" or "↓" key changes gas measuring unit.
- (% / %LEL / PPM / PPB ).
- When a desired gas measuring unit is displayed, contact "FUNC" key to set the unit and enter Program
- Mode.
DECIMAL POINT
[ 100 ]
- Mode that changes decimal place and contacting "↑" or "↓" key changes decimal place.
- (0.100/1.00/10.0/100)
- When a desired decimal place is displayed, contact "FUNC" key to set the decimal place and enter the
- next Program Mode.
HIGH SCALE
[ 100 ]
- Mode that sets high scale value that should be displayed for full range. Contacting "↑" or "↓" key
- increases or decreases the scale value. ( 1 ~ 10000 )
- When a desired high scale is displayed, contact "FUNC" key to set the high scale value and enter the
- next Program Mode.
PASSWORD
[00]
- It is password setting mode. This password is checked when entering Program Mode. Default is "00".
- Set using "↑" or "↓" key then contact "FUNC" key to set the password and enter the next Program Mode.
7. System Mode

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GTD-3000ExW
Instruction Manual
7.2. Calibration Mode
7.2.1. Zero Calibration
PASSWORD
[**]
- Contacting "FUNC" key with the Magnet-bar for 2 sec or longer in Measuring Mode enters Password mode.
- After setting Password using "↑" or "↓" key, contact "FUNC" key.
CALIBRATION
MODE
- Contact "↑" or "↓" key to select "Calibration Mode".
- Contact "FUNC" key when "CALIBRATION MODE" is displayed to enter Calibration Mode.
- Contact "RESET" key to return to Measuring Mode.
CALIBRATION
[ZERO]
- When "CALIBRATION MODE" is displayed, contacting "FUNC" key selects Zero Calibration.
- Contact "↑" or "↓" key to achieve [ZERO] then contact "FUNC" key to enter Zero Calibration.
ZERO CALIBRATION
[YES] - Contact "↑" or "↓" key to achieve [YES] then contact "FUNC" key to perform Zero Calibration.
ZERO GAS
[ 0]
- Using a calibration tool, inject clean air or 100% nitrogen into the sensor at a flow rate of 500 mL/min for
- 1 min. Contact "FUNC" key when measurement is stabilized to automatically perform Zero Calibration.
ZERO PROCESSING
SUCCESS >>>>
- When zero calibration is successful, "ZERO SUCCESS" is displayed for 2 sec on LCD display then it
- changes to "CALIBRATION DATA" Mode.
- When zero calibration is not successful, "ZERO FAIL" is displayed for 2 sec and it changes to
- "CALIBRATION DATA" Mode.
- ZERO FAIL occurs when sensor input value exceeds 70% of total ADC input range.
ZERO PROCESSING
FAIL >>>>
CALIBRATION DATA
[ 0]
- It is a mode to display measurement after calibration and checks whether calibration is successful
- after performing auto calibration.
- When it failed, it displays "FAIL" and the current measurement in 1 sec interval.
- Contact "RESET" key to return to "Calibration mode".
■ Due to characteristics of the gas detector, minimum 30 min of stabilization time is required and maintenance
condition may change depending on site condition.
7. System Mode7. System Mode
7.2.2. Span Calibration
CALIBRATION
MODE
- Contact "↑" or "↓" key to select "Calibration Mode".
- Contact "FUNC" key when "CALIBRATION MODE" is displayed to enter Calibration Mode.
- Contact "RESET" key to return to Measuring Mode.
CALIBRATION
[SPAN] - Contact "↑" or "↓" key to achieve [SPAN] then contact “FUNC" key to enter Span Calibration mode.
SPAN CALIBRATION
[YES] - Contact "↑" or "↓" key to achieve [YES] then contact "FUNC" key to perform Span Calibration.
SPAN GAS VALUE
[ O ]
- Using a calibration tool, inject the standard gas to the sensor at a flow rate of 500 mL/min for 90 sec.
- After the measurement is stabilized, contact "FUNC" key to enter the next mode.
- When Hold function in Maintenance Mode is on, the current maximum SPAN gas value is held and
- displayed in the first row.
- The current measurement is displayed in the second row.
[ 0]
< O ]
SPAN SET VALUE
[ 5O ]
- It is a mode to set standard gas value. When there is no "Fail" message, contact "↑" or "↓" key to set a value.
- When the inject standard gas value is abnormal, it displays Fail message. Fail message is as follows.
- Fail message and span set value are displayed alternatively.
- ① "LOW FAIL" occurs when the difference between injected gas value and zero calibration value is below 1%.
- ② "HIGH FAIL" occurs when injected gas value is above 95% of total ADC input range.
- "RING FAIL" occurs when injected gas value runs in the current set span value, it exceeds 95% of ADC
- input range. The above FAIL messages are automatically released if the status is normal after adjusting
- SPAN value.
CALIBRATION DATA
CALIBRATION DATA
CAL HIGH ERROR
SPAN PROCESSING
SUCCESS >>>>
- After completing the standard gas value setting, contacting "FUNC" key automatically runs Span
- Calibration. When it succeeds, "SPAN PROCESSING SUCCESS" is displayed on LCD display for 2 sec
- then it changes to "CALIBRATION DATA" Mode.
- When span calibration is not successful, "SPAN PROCESSING FAIL" is displayed for 2 sec and it
- changes to "Calibration Data Mode".
SPAN PROCESSING
FAIL >>>>
CALIBRATION DATA
[ 0]
- It is a mode to display measurement after calibration and checks whether calibration is successful after
- performing auto calibration.
- Contact "RESET" key to return to "Calibration mode".

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GTD-3000ExW
Instruction Manual 7. System Mode7. System Mode
7.3. ALARM MODE
PASSWORD
[**]
- Contacting "FUNC" key with the Magnet-bar for 2 sec or longer in Measuring Mode enters Password mode.
- After setting Password using "↑" or "↓" key, contact "FUNC" key.
ALARM PROGRAM
MODE
- Contact "↑" or "↓" key to select "Alarm Program Mode".
- Contact "FUNC" key when "ALARM PROGRAM MODE" is displayed to enter Alarm setting mode.
- Contact "RESET" key to return to Measuring Mode.
ALARM OPERATING
[ AUTO ] - It is a mode that sets reset method after an event of alarm. Contacting "↑" or "↓" key changes between
- "AUTO" and "MANUAL".
- "AUTO" mode automatically resets the alarm. "MANUAL" mode resets the alarm only when Reset key is
- pressed.
ALARM OPERATING
[ MANUAL]
ALARM RELAY TYPE
DE-ENERGIZED
- It is a mode that sets Reset method after an event of Alarm. Contacting "↑" or "↓" key changes between
- "DE-ENERGIZED" and "ENERGIZED".
- "DE-ENERGIZED" deactivates energizer mode and "ENERGIZED" activates energizer mode.
FAULT RELAY TYPE
DE-ENERGIZED
- It is a mode that sets Reset method after an event of FAULT. Contacting "↑" or "↓" key changes
- between "DE-ENERGIZED" and "ENERGIZED".
- "DE-ENERGIZED" deactivates energizer mode and "ENERGIZED" activates energizer mode.
ALARM1 TYPE SEL.
[INCREASE ] - It is a mode that sets operational direction of Alarm1. Contact "↑" or "↓" key to display "INCREASE" or
- "DECREASE".
- "INCREASE" mode runs when the value is at Alarm1 threshold or higher. "DECREASE" mode runs when
- the value is at Alarm 1 threshold or lower.
ALARM1 TYPE SEL.
[DECREASE ]
ALARM1 LEVEL ADJ
[ 20]
- It is a mode that sets Alarm1 level threshold. Contact "↑" or "↓" key to increase or decrease Alarm
- 1 level, respectively.
- When a desired alarm 1 threshold is displayed, contact "FUNC" key to set it and enter the next item.
ALARM1 DEAD BAND
[ 0.0]%FS
- It is a mode that sets operation range of Alarm1. Contact "↑" or "↓" key to increase or decrease the
- value, respectively.
- When Alarm1 is in "INCREASE" mode, it runs at Alarm1 threshold + Dead band and is released at
- Alarm1 threshold - Dead band.
- When a desired value is displayed, contact "FUNC" key to set the dead band value and enter the next
- Alarm Program Mode
ALARM1 TIME SET
[ 1] SEC
- It is a mode that sets Alarm1 dwell time. Contact "↑" or "↓" key to increase or decrease the value,
- respectively.
- Displayed number is in sec and in a range from 0 to 60. When a desired value is displayed, contact
- "FUNC" key to set the alarm dwell time and enter the next Alarm Program mode.
ALARM1 RELAY CTL
[ ON]
- It is a mode that sets whether to contact relay contact during Alarm1 operation. Contact "↑" or "↓" key
- to change the display between "ON" or "OFF".
- In ON mode, relay runs during Alarm1 operation. In OFF mode, relay do not run during Alarm1
- operation.
ALARM2 TYPE SEL.
[INCREASE ] - It is a mode that sets operational direction of Alarm2. Contact "↑" or "↓" key to display "INCREASE" or
- "DECREASE".
- "INCREASE" mode operates when the value is equal or larger than set alarm threshold. "DECREASE"
- mode operates when the value is equal or less than set alarm threshold.
ALARM2 TYPE SEL.
[DECREASE ]
ALARM2 LEVEL ADJ
[ 40 ]
- It is a mode that sets Alarm2 level. Contact "↑" or "↓" key to increase or decrease Alarm2 level,
- respectively.
- When a desired alarm 2 threshold is displayed, press "FUNC" KEY to set it and enter the next Alarm
- Program mode.
ALARM2 DEAD BAND
[ 0.0 ]%FS
- It is a mode that sets operational direction of Alarm2. Contact "↑" or "↓" key to increase or decrease
- the value, respectively.
- When Alarm2 is in "INCREASE" mode, it runs at Alarm2 threshold + Dead band and is released at
- Alarm2 threshold - Dead band. When a desired value is displayed, contact "FUNC" key to set the
- dead band value and enter the next Alarm Program Mode.
ALARM2 TIME SET
[ 1] SEC
- It is a mode that sets Alarm2 dwell time. Contact "↑" or "↓" key to increase or decrease the value,
- respectively.
- Displayed number is in sec and in a range from 0 to 60. When a desired value is displayed, contact
- "FUNC" key to set the alarm dwell time and enter the next Alarm Program mode.
ALARM2 RELAY CTL
[ ON]
- It is a mode that sets whether to contact relay contact during Alarm2 operation. Contact "↑" or "↓" key
- to change the display between "ON" or "OFF".
- In ON mode, relay runs during Alarm2 operation. In OFF mode, relay do not run during Alarm2 operation.

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GTD-3000ExW
Instruction Manual 8.Troubleshooting 9. Interface Conguration
8.1. Fault List
[Table 10. Fault List]
FAULT MESSAGE DESCRIPTION & CONDITION CAUSE
[FAULT-01]
"SENOR EMPTY" Occurs when sensor module is disconnected. Defective Sensor Module connection
[FAULT-02]
"SENSOR HIGH" Sensor output is above ADC max. value. Defective sensor module or transmitter board ADC
[FAULT-03]
"SENSOR LOW" Sensor output is below ADC min. value. Defective sensor module or transmitter board ADC
[FAULT-04]
"EEPROM ERROR" Defective Transmitter EEPROM Checksum Defective Transmitter Board EEPROM
[FAULT-05]
"+24V LOW"
It occurs when 24 V main input power is inputed
with voltage below 10 V.
Input power below 10V or defective Transmitter
ADC
[FAULT-06]
"ADC FAIL" Defective Transmitter ADC Defective Transmitter ADC
[FAULT-07]
"H/W REVISION" H/W Version Error Defective MPU inside Transmitter
[FAULT-08]
"SENSOR HUNTING"
When there is repeated hunting error in gas
measurement
Sensor output status may be poor or check for input
power noise.
8.2. Recovery List
[Table 11. Recovery List]
No CAUSE SOLUTION
1Defective Sensor Module Connection 1) Check Sensor Connection and Connection status of the Connector
2) Change Sensor
2Defective Sensor Module Change Sensor
3Defective Transmitter Board ADC Change Transmitter Board
4Defective Transmitter Board EEPROM 1) Perform Factory Initialization then correct parameter and re-calibrate
2) Change sensor unit when the same problem occurs again
5Defective MPU inside Transmitter Change Transmitter Main Board
6Poor Sensor Output Status Change Sensor
7Check Input Power Noise Check External Input Voltage Noise Status
9.1. MODBUS RS485
TYPE ADDRESS BITS DESCRIPTION
Measured Gas
Concentration 30001 BIT15~0 Gas Measurement (Integer/Decimal point is not considered)
High Scale Setting 30002 BIT15~0 High Scale Setting (Integer/Decimal point is not considered)
Alarm 1 Setting 30003 BIT15~0 Alarm 1 Setting (Integer/Decimal point is not considered)
Alarm 2 Setting 30004 BIT15~0 Alarm 2 Setting (Integer/Decimal point is not considered)
Gas detector status
value 10000
BIT0 Alarm 1 Active Status
BIT1 Alarm 2 Active Status
BIT2 Fault Active Status
BIT3 Maintenance Mode Status
BIT4 Test Mode Status
BIT5 Calibration Mode Status
BIT6 Reserved
BIT7 Toggle Bit (Bit reversal in 2 sec interval)
External Test 3BIT0~7 Gas Detector Test Mode Setting
External Reset 2BIT0~7 Exit Gas Detector Test Mode
9.1.1. Interface setting
9.1.2. MODBUS RS485 Address map
■ Data Format: RTU
■ Baud rate: 9600 bps
■ Data bits: 8bits
■ Stop bit: 1bits
■ Parity: Even
■ For details, please go to www. modbus.org
[Table 12. RS485 MODBUS Address 구성]

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GTD-3000ExW
Instruction Manual 10. Drawings and Dimensions10. Drawings and Dimensions
10.2. Warning Light GTL-10010.1. Standard Type
[Figure 14. GTL-100 Drawing][Figure 13. GTD-3000ExW Standard Type Drawing]

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GTD-3000ExW
Instruction Manual 10. Drawings and Dimensions
10.3. When Connecting Warning Light
[Figure 15. GTD-3000ExW 경광등 결합 외형도]
11. Precautions before Installation
11.1. Selecting a Place for Installation (Occupational Health & Safety Act 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.
11.2. Selecting a Site for Installation (High-Pressure Gas Safety Control 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.
11.3. 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.
■ Surrounding temperature shall be in a range of -20 to 60 °C (For the main unit and sensor, refer to each sensor manual.)

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GTD-3000ExW
Instruction Manual 11. Precautions before Installation
■ Installation Height: 1,000 M below sea level
■ Relative Humidity: 5% ~ 99% (Non-condensing)
■ Installation Site: Indoor and Outdoor
■ Explosion Ignition Group for Target 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]
VERSION CONTENTS DATE
0.1 * Manual Initial Revision 2017. 09. 29
0.2 * Correct typos and typographical errors 2019. 11. 19
12. Revision History
[Figure 16. High-Pressure Packing Type] [Figure 17. 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