GASTRON GTD-1000Tx User manual

GTD-1000Tx
Instruction Manual
Read in detail for correct use.

Gas & Flame
Detection System
GTD-1000Tx
Instruction Manual
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]

* 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.
www.gastron.com
02_03
Greetings
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.

Contents
GTD-1000Tx
Instruction Manual
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 ····················································································· 10
5.1. Detachment of Housing Cover ································································· 10
5.2. Main PCB Configuration ······································································· 11
5.3. Power Signal and Terminal Configuration ······················································· 12
5.4. Method to Connect to External Control Unit ······················································ 13
5.5. Installation Cable Length ······································································· 14
6. Calibration and Maintenance ······································································ 15
6.1. 4-20mA Output Diagnosis ····································································· 15
6.2. 4mA Adjustment (ZERO Calibration) ····························································· 15
6.3. SPAN Calibration ············································································· 16
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 during Installation ································································· 19

www.gastron.com
04_05
Contents
9. Revision History ··················································································· 21

GTD-1000Tx 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 toxic gas detector is installed in areas with gas leak hazards and continuously monitors gas leak. It
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 higher is used.)
Body of GTD-1000Tx 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.
2. Conguration
1. Overview
GTD-1000Tx
Instruction Manual
[Figure 1. GTD-1000Tx Overview]
Gas
Sensor Module
(GSA860EX)
Main Board
(Transmitter)
+24V DC
4-20mA Analog
Signal Output
Transmitter enclosure
Safety Power Supply Unit
(24VDC)
Safety Controller
(PLC or DCS)
GTD-1000Tx Gas Detector
Hazardous Area (Filed) Safe Area
제어
Signal
External Interface
Power Line
Legend

www.gastron.com
06_07
3. Specication
※ Note1. Refer to the measured gas list for measured gases and their ranges. Contact us for special gas.
3.1. Basic Specifications
3.2. Mechanical Specifications
ITEMS SPECIFICATION
Measuring Type Diffusion
Measuring Method - Electro-Chemical Cell
- Heated-semiconductor 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
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)

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:
18V
24V
31V
1V pk-pk
Wattage Max. wattage:
Max. current:
3.6W @+24 VDC
150mA @+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
21.6mA
20mA - 21.4mA
3mA
Analog output current ripple & noise max ±20uA
Wiring requirement Power CVVS or CVVSB with shield
Analog 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
Instruction Manual

www.gastron.com
08_09
4. Name and Description of Each Part
4.1. Components
[Figure 2. GTD-1000Tx Components]
NO NAME DESCRIPTIONS
1Detector housing body Protects PCB Board built in Sensor and Housing from external environmental change and shock.
2Detector housing cover It is assembled with detector housing body and protects PCB Board built in Sensor and Housing
from external environmental change and shock
3Sensor head
It is a site that detects actual gas leak. It converts the amount of gas leak into electrical signal and
transmits to the Amp PCB.
4Internal grand
(2sq↑ cable) It must be grounded to inside of detector for protection from external noise or strong electric field
5External ground
(2sq↑ cable)
It must be grounded to outside of detector for protection from external noise or strong electric
field.
6Conduit connection
It is supplied for inlet of power supply and measurement output signal for the detector during
installation. For cable inlet, PF or NPT 1/2", 3/4" are prepared.
(Default specification is PF 3/4".)
7Mount holes(2-Ø7) Hole to fix the gas detector on external wall or other installation sites.
8Sensor terminal CN1 is Sensor Connection Terminal.
9Model name plate Model name, measuring gas, serial number, etc. are labeled.
[Table 1. GTD-1000Tx Components Description]

GTD-1000Tx
Instruction Manual 5. Installation
[Figure 3. Slotted Set Screw]
■ 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 sensor
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 turns counter clockwise (ccw) using
a hex wrench (M2) then turn the cover of gas leak detector ccw to detach the cover.

www.gastron.com
10_11
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
1CN3 Program download Connector
2SW5 Zero Calibration Switch
3SW6 Span Calibration Switch
4SW1 Sensor Configuration Switch1(Factory Setting)
5VR1 Potentiometer for ZERO Output Adjustment
6VR2 Potentiometer for SPAN Output Adjustment
7SW4 Sensor Configuration Switch2(Factory Setting)
8SW3 Mode Control DIP Switch
9CN5 Power & Output Signal Terminal
10 FND1,2 FND for Internal Status Display

5. Installation
GTD-1000Tx
Instruction Manual
5.3. Power and Signal Terminal Configuration
[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 + +24V / POWER (+)
2mA 4~20mA Source Out
3 - GND / POWER (-)
4ET EARTH
■ 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-clock wise using a Θ driver. Connect DC 18~24 V power to +, and - then
connect signal cable to mA. Tighten 5 terminal fixing screws clockwise so that terminal does not leave the track
then insert Main PCB as the same condition before disassembly.
Terminal Set Screw

www.gastron.com
12_13
5. 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. Installation
GTD-1000Tx
Instruction Manual
5.5. Installation Cable Length
■ The maximum length between GTD- 1000Tx and power supply is decided by wire specification.
■ 최Max. 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 minimum operating voltage = 18 Vdc
·VMAXDROP = 24 - 18 = 6V
·IMAX = 0.15A( 150mA )
·6 ÷ 0.15 ÷ 0.01318 ÷ 2 = 1517.451m ≒ 1517m
[Figure 7. Calculation of GTD-1000Tx 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 3838
14 2.08 0.00828 2415
16 1.31 0.01318 1517
18 0.82 0.02095 954
20 0.518 0.0333 600

www.gastron.com
14_15
■ 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
■ It supplies voltage of 18~31 V and current of 200 mA to the sensor. When the voltage is measured by connecting a
multimeter to TP5 (+mA) and TP6 (-mA) of AMP PCB, current of 4~20 mA can be confirmed.
6.2. 4mA Adjustment (ZERO Calibration)
■ Check voltage of 18~31 V DC at both (+24 V) and (GND) of terminal block 'CN5'.
■ Check whether (mA) terminal of terminal block 'CN5' is connected to the receiver.
■ Change DMM to current measuring mode, then connect (+) and (-) terminals of DMM to TP5 (+mA) and TP6(-mA) of
AMP PCB, respectively.
■ When zero switch (SW5) is pressed for 3 sec, a message "[ZE][RO]" flashes 3 times on FND1 and FND2 and it enters
zero calibration mode.
■ When clean air or 99.9% nitrogen (N2) is injected to cell part, 4 mA output is observed. If the output is not 4 mA, adjust
the potentiometer 'VR2 (ZERO)' left and right to set 4mA.
■ Adjust 'ZERO' potentiometer to obtain a current of 4.00 mA to be displayed on FND1 and FND2.
■ When zero switch (SW5) is pressed for 3 sec after output is set to 4 mA, result from zero calibration is displayed on
FND1 and FND2. "[PA][SS]" means that the calibration has performed successfully. "[FA][IL]" means that the calibration
has not met the condition and failed. In this case, sensor and power must be reconfirmed then calibration shall be
performed again.
6. Calibration and Maintenance
[Figure 8. 4-20mA Output Test Terminal]

GTD-1000Tx
Instruction Manual
[Figure 9. ZERO Calibration related Parts]
6.3. SPAN Calibration
■ Check voltage of 18~31 V DC at both (+24 V) and (GND) of terminal block 'CN5'.
■ Check whether (mA) terminal of terminal block 'CN5’ is connected to the receiver.
■ Change DMM to current measuring mode, then connect (+) and (-) terminals of DMM to TP5 (+mA) and TP6(-mA)
of AMP PCB, respectively.
■ When span switch (SW6) is pressed for 3 sec, a message "[SP][AN]" flashes 3 times on FND1 and FND2 and it enters
span calibration mode.
■ When the standard calibration gas is injected into cell part, 12 mA output is observed. If the output is not 12 mA, adjust
the potentiometer 'VR3 (SPAN)’ left and right to set 12 mA.
■ Adjust 'SPAN' potentiometer to obtain the correct current output for the standard gas to be displayed on FND1 and
FND2.
■ When SPAN switch (SW6) is pressed for 4 sec after it is set to a desired output, result from span calibration is displayed
on FND1 and FND2. "[PA][SS]" means that the calibration has performed successfully. "[FA][IL]" means that the
calibration has not met the condition and failed. In this case, sensor and power must be reconfirmed then calibration
shall be performed again.
6. Calibration and Maintenance

www.gastron.com
16_17
[Figure 10. Span Calibration related Parts]
■ Ex.) Output Calculation Method for NH3
Range : 0-150ppm Calibration gas : 100ppm NH3 /N2 balance
Output signal : 4-20mA Test point signal ( TP5, TP6 )
■ Ex.) Output Calculation Method for CO
Range : 0-150ppm Standard Gas : 100ppm
Output signal : 4-20mA Test point signal (TP5, TP4)
(200 - 40) × 100ppm NH3 (Standard Gas) + 40 = 147 = 14.7mA
150ppm NH3 (Measurement Range)
(200 - 40) × 100ppm CO (Standard Gas) + 40 = 147 = 14.7mA
150ppm CO(Measuring Range)
6. Calibration and Maintenance

GTD-1000Tx
Instruction Manual 7. Drawings and Dimensions
[Figure 11. GTD-1000Tx Drawing]

www.gastron.com
18_19
8. Precautions before Installation
8.1. 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.
8.2. 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.
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.
■ Use with surrounding temperature in a range of -20 C ~ 50 °C.

[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
GTD-1000Tx
Instruction Manual 8. Precautions before Installation
■ 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.
■ 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!