KR20230112853A - Explosion proof inhalation type gas detector with pyrolyzer - Google Patents

Abstract

The gas detection device according to the present disclosure was developed to prevent accidents by detecting leaking gas at industrial sites, such as factories producing or using toxic gases, gas storages, and various gases generated in the manufacturing process, with a suction structure. .
The gas detection device according to the present disclosure is installed in an area with a risk of gas leakage, continuously and constantly detects gas leakage, measures gas by sucking in outside air using a pump installed in the gas detection device, and measures the gas. It is indicated by 7-segment LED, supports various industrial interfaces such as analog 4-20mA standard output, RS-485 and POE, and can provide relay contact signals in case of gas leakage alarm.

Description

Explosion-proof suction type gas detection device using a pyrolysis device {EXPLOSION PROOF INHALATION TYPE GAS DETECTOR WITH PYROLYZER}

The present disclosure relates to a gas detection device, and more particularly, to an explosion-proof suction type gas detection device using a pyrolysis device.

In factories, gas storages, and industrial sites that produce or use toxic gases, when gas leaks, disasters such as gas poisoning of field workers, explosions of field facilities, and fire accidents may occur.

In recent years, industrial sites and factories handling various gases have been increasing, and accordingly, gas leakage accidents and their damages are also increasing. In particular, when the leakage of toxic gas is dangerous, it is required to detect and cope with it at an early stage.

An object of the present disclosure is to provide a gas detection device capable of early preventing an accident due to leakage by detecting toxic gas leaking at an industrial site with a suction type structure.

According to one embodiment of the present disclosure, an explosion-proof suction type gas detection device using a pyrolysis device is provided. The apparatus includes a sampling and sensor unit configured to sense gas by inhaling and pyrolyzing it; a main unit configured to measure gas concentration and flow rate through the sampling and sensor unit and to control the gas sensing device; a display unit configured to display measured values of the gas concentration and flow rate; and a terminal unit for outputting a signal to the outside of the gas detection device.

According to the present disclosure, it is installed in an area with a risk of gas leakage as a pressure-resistant explosion-proof structure, and it is possible to detect and deal with gas leakage continuously and continuously.

In addition, according to the present disclosure, it is possible to check for gas leakage by sucking in external air using a pump installed in the gas detection device, measuring gas, and displaying the measured value with a 7-segment LED.

Furthermore, according to the present disclosure, when a gas leakage alarm occurs, it is possible to recognize and deal with gas leakage early by generating an alarm by generating a relay contact signal.

1 is a view showing the appearance of an explosion-proof suction type gas detection device using a pyrolysis device according to the present disclosure.
2 is an overview of an explosion-proof suction type gas detection device using a pyrolysis device according to the present disclosure.
3 is a diagram showing components of an explosion-proof suction type gas detection device using a thermal decomposer according to the present disclosure.
4 is a view showing a front display configuration of an explosion-proof suction type gas detection device using a pyrolysis device according to the present disclosure.
5 is a diagram showing the configuration of a 4-20mA Source driver of an explosion-proof suction type gas detection device using a pyrolysis device according to the present disclosure.
Figure 6 is a diagram showing the configuration of a 4 ~ 20mA Sink Driver of the explosion-proof suction type gas detection device using a thermal decomposer according to the present disclosure.
7 is a diagram showing the configuration of a 4-20 mA 3 Wire Sink Driver of an explosion-proof suction type gas detection device using a thermal decomposer according to the present disclosure.
8 is a view explaining the calculation of the installation cable length of the explosion-proof suction type gas detection device using a pyrolysis device according to the present disclosure.
9 is a view showing the appearance and dimensions of an explosion-proof suction type gas detection device using a thermal decomposer according to the present disclosure.
10 is an exemplary view showing a pressure-resistant packing type seal.
11 is an exemplary view showing sealing Y sealing compound.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, in adding reference numerals to components of each drawing, it should be noted that the same components have the same numerals as much as possible even if they are displayed on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description will be omitted.

Various aspects of the invention are described below. It is to be understood that the inventions presented herein may be embodied in a wide variety of forms and that any specific structure, function, or all presented herein is illustrative only. Based on the inventions presented herein, a person skilled in the art to which the present invention pertains knows that one aspect presented herein can be implemented independently of any other aspects, and that two or more such aspects can be implemented in various ways. It will be understood that it can be combined with For example, an apparatus may be implemented or a method may be practiced using any number of the aspects set forth herein. In addition, such an apparatus may be implemented or such a method may be practiced using a structure, function, or structure and function in addition to or other than one or more aspects set forth herein.

1 is a view showing the appearance of an explosion-proof suction type gas detection device using a pyrolysis device according to the present disclosure.

0. Overview

GTD-5000F (TxP) Gas detector was developed to prevent accidents by detecting leaking gas in industrial sites such as factories producing or using toxic gases, gas storage, and various gases generated in the manufacturing process with a suction type structure. .

GTD-5000F(TxP) Gas detector is installed in the area where there is a risk of gas leakage, detects gas leakage constantly and continuously, uses a pump installed in the gas detector to inhale external air to measure gas, and measures the gas with 7 segments. Displayed with LED, supports various industrial interfaces such as analog 4-20mA standard output, RS-485 and POE, and provides relay contact signal when gas leakage alarm occurs.

In addition, analog 4-20mA standard output can be connected up to 2500m (when using CVVS or CVVSB 1.5sq↑Shield Cable) for output signal transmission distance between gas detector and receiver, and RS-485 communication signal is 1000m (RS-485 When using a dedicated line), transmission is possible.

1. Rescue

2 is an overview of an explosion-proof suction type gas detection device using a pyrolysis device according to the present disclosure.

The gas detection device according to the present disclosure can be installed in any toxic and combustible gas leakage risk area, and is a pressure-resistant explosion-proof suction type gas detector with a built-in diaphragm pump and flow sensor. The 4-digit FND inside the device displays the measured value of gas at the installation site. The internal structure consists of a display part that displays measured values, a main control part that measures and controls gas concentration and flow rate, and a terminal part that outputs current output (Analog 4-20mA) or RS-485 communication signal and alarm signal to the outside. .

2. Specification

2.1. Basic Specifications

I T E M S S P E C I F I C A T I O N Measuring Type Auto Sampling type Measurement display (Measuring Type) Flexible Numeric Display LEDs Measuring Method Electrochemical / Cartridge Detectible Gas Toxic gas Measuring Range 000.0 to 9999 can be displayed (Note1) Accuracy ≤ ±3% / Full Range Zero Drift ≤ 2% / full range Response Time Depending on the sensor module, refer to the sensor specification or contact us for special gas. Suction pump (Pump Type) Diaphragm Pump Flow Rate 100 ~ 1,000 ml (Normal 300 ~ 500ml / min) Approvals Classification KCs: Ex d llC T6 IP65
ATEX/IECEX: II 2 G Ex d IIB+H2 T6 Gb (Ta=-20'C to +60'C) , T5 Gb (Ta=-20'C to +70'C) Default Interface Analog 4-20mA current interface Output Selection Option RS485, POE Interface Warranty Body (Transmitter) 2 years Sensor 1 year

Note1. For measuring gas and range, please refer to the document for measuring gas list. In case of special gas, please contact us.

2.2. Mechanical Specifications

I T E M S S P E C I F I C A T I O N Explosion Proof type explosion-proof enclosure Dimension 226.3(W) × 154(H) × 238(D) mm Weight including Sensor App. 5.0kg Mounting type wall mount Mounting Holes Ø 11 ±0.1 Cable inlet 3/4" PF ( 1/2” or 3/4” NPT ) Suction conduit ( Tube )
(Sample gas vent / inlet) 1/4" Teflon Tube Body material Aluminum alloy

2.3. Electrical Specifications (Standard Type)

I T E M S S P E C I F I C A T I O N Input Voltage (Standard)
※ Customer supplied PSU must meet requirements IEC 1010-1 and CE Marking requirements. Absolute min:
Nominal:
Absolute max:
Ripple maximum allowed: 18V
24V
31V
1V pk-pk Input Voltage (POE option) 48 VDC Power-over-Ethernet
(IEEE 802.3af compliant) Wattage Max. wattage:
Max. current: 13.2W @+24 VDC
550mA @+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
22.0mA
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 requirements Power CVVS or CVVSB with shield Analog CVVS or CVVSB with shield POE CAT5 cable or equivalent RJ45 RS485 Shielded Twisted Pair (STP) signal transmission distance
(Cable Connection Length) Analog 2500m POE 100 m RS485 1000m EMC Protection: Complies with EN50270

2.4. Environmental Specifications

I T E M S S P E C I F I C A T I O N Operation Temperature main body -10 to 60℃ sensor Please refer to the sensor specification sheet Storage Temperature main body -10 to 60℃ sensor Please refer to the sensor specification sheet Operation Humidity main body 5 to 99% RH (non-condensing) sensor Please refer to the sensor specification sheet Pressure Range 90 to 110KPa Max. air velocity 6m/s

3. Name and description of each part

3.1. Component

3 is a diagram showing components of an explosion-proof suction type gas detection device using a thermal decomposer according to the present disclosure. These components are described in Table 5 below.

No Name Descriptions One Case cover It protects the sensor, PCB board and sensors embedded inside the product from external environmental changes and shocks. 2 Mount Holes This is a mounting hole used to fix the product. 3 LCD display When setting the gas concentration value and parameter measured by the sensor, the setting mode is displayed in numbers and LED. (Refer to “Front Display Configuration” for details. 4 Power LEDs When power (DC 24V) is normally supplied, Green LED is turned on. 5 Trouble LED When the sensor and flow rate are recognized as faulty, the yellow LED turns on, and when set, a trouble relay contact signal is output to the outside. 6 Alarm1 LED (Red) When the measured gas concentration exceeds the Alarm1 set value, the LED turns on, and when set, a relay contact signal is output to the outside. (Alarm1 level setting can be set arbitrarily in Alarm setting mode.) 7 Alarm2 LED (Red) When the measured gas concentration exceeds the Alarm2 set value, the LED turns on, and when set, a relay contact signal is output to the outside. (Alarm2 level setting can be set arbitrarily in Alarm setting mode.) 8 Function key It is a mode conversion and setting key in function setting mode. If you press and hold the FUNC key for more than 2 sec in the measurement state, you enter into the function setting menu mode. (Configuration, Program, Calibration, Alarm, Time, etc.) 9 Up key This key increases the setting value in the function setting mode. 10 Down key This is a key that lowers the setting value in the function setting mode. If you press the Down key for more than 2 sec in the measurement state, it enters the inspection mode (EMS: Emergency Maintenance System) and the TEST LED flickers. If you press the Down key for more than 2 sec in the inspection mode, it is released. 11 Reset key When converting from function setting mode to menu state or measurement state, use the Reset key to return. 12 Window Glass It is a tempered glass that allows you to see the display status that informs the product status in the housing. 13 Cover fixed screw This screw fixes the main body case and the front cover case. 14 Gas inlet Sample gas inlet port. (1/4” Tube) 15 Gas outlet Sample gas output port. (1/4” Tube) 16 Cable gland This is the entrance for power and signal cables.

3.2. front part configuration

4 is a view showing a front display configuration of an explosion-proof suction type gas detection device using a thermal decomposer according to the present disclosure. These front-panel display configurations are described in Table 6.

No Name Descriptions One Power LED(Green) When power (DC 24V) is normally supplied, LED turns on. 2 Trouble LED Displays when a fault is detected during self-diagnosis of the gas detector 3 Alarm1 LED Alarm1 set or displayed if detected 4 Alarm2 LED Alarm2 set or displayed if detected 5 FND DISPLAY When setting the gas concentration value and parameter measured by the sensor, the setting mode is displayed in numbers and icons 6 FLOW LED Current flow rate displayed as a graph bar 7 CAL LEDs Display when calibration is in progress 8 MAINT LED Displayed when engineering mode is executed 9 COMM LEDs Displayed when RS485 communication is connected 10 TEST LED Displayed when checking mode is executed 11 Display unit display gas units of measurement

4.Installation

4.1. terminal configuration

- Warning: Do not open while energized.

- Loosen the case cover fixing screw on the front of the detector, and separate the case cover by rotating it in the opposite direction of the screw. Then Terminal PCB terminal appears.

4.1.1. CN16 Terminal

CN16 terminal consists of a terminal for detector power and 4-20mA output.

Pin no. terminal name explanation One GND Detector power - 2 +24V detector power + 3 GND Detector power - 4 mA 4~20mA Output Signal 5 VISO Isolation power (used when configuring 4-20mA sink mode)

4.1.2. CN17 Terminal

CN17 terminal is composed of terminal for RS485 output and alarm relay output.

Pin no. terminal name explanation 6 AL2 OUT Alarm2 RELAY OUTPUT terminal, by J3 Jumper setting
Output mode is determined. 7 AL2 COM Alarm2 RELAY COMMON terminal, 8 AL1 OUT Alarm1 RELAY OUTPUT terminal, by J6 Jumper setting
Output mode is determined. 9 AL1 COM Alarm1 RELAY COMMON terminal, 10 TRB OUT TROUBLE RELAY OUTPUT terminal, by J7 Jumper setting
Output mode is determined. 11 TRB COM TROUBLE RELAY COMMON jack, 12 RS485B RS485 B terminal 13 RS485A RS485 A terminal 14 PY- Pyrolyzer Power - Terminals 15 PY+ Pyrolyzer power + terminal

4.2. Configuration of Power and 4-20mA Signal

- Warning: When connecting the power terminal, cut off the power before working.

- When using DC24V power, connect the power to CN16 (+24V, GND).

- 1.5sq or more shielded cable must be used.

4.2.1. Configuration of Power and 4~20mA Source

5 is a diagram showing the configuration of a 4-20mA Source driver of an explosion-proof suction type gas detection device using a pyrolysis device according to the present disclosure.

The 4-20mA Signal terminal on the PLC side is connected to ‘mA’ of GTD-5000F (TxP), and the GND terminal is used in common with power. And connect Jumper-Pin to J1 of Main Board.

4.2.2. Configuration of power and 4~20mA sink

Figure 6 is a diagram showing the configuration of a 4 ~ 20mA Sink Driver of the explosion-proof suction type gas detection device using a thermal decomposer according to the present disclosure.

Connect the 4-20mA sink output (+) terminal on the PLC side to the E.+V terminal and connect the (-) terminal to the ‘mA’ terminal. And connect the J1 Jumper to the SINK side.

4.2.3. Configuration of power supply and 4~20mA 3 Wire Sink

7 is a diagram showing the configuration of a 4-20 mA 3 Wire Sink Driver of an explosion-proof suction type gas detection device using a thermal decomposer according to the present disclosure.

Connect the 4-20mA sink output (+) terminal on the PLC side to the VISO terminal and the (-) terminal to the (-) terminal of the power supply (24V DC). Connect the ‘mA’ terminal to the ‘GND’ terminal. And open J1 Jumper-Pin.

4.3. Alarm terminal configuration

Connect Trouble, Alarm Relay connected to CN17 terminal using the configuration below.

4.3.1. Trouble Relay output configuration

terminal name Fault Relay Contact Jumper settings TRB-OUT Normal close mode J7 Jumper NC on Normal Open Mode J7 Jumper NO on TRB-COM Common -

4.3.2. Alarm1 Relay output configuration

terminal name Fault Relay Contact Jumper settings AL1-OUT Normal close mode J6 Jumper NC on Normal Open Mode J6 Jumper NO on AL1-COM Common -

4.3.3. Alarm2 Relay output configuration

terminal name Fault Relay Contact Jumper settings AL2-OUT Normal close mode J3 Jumper NC on Normal Open Mode J3 Jumper NO on AL2-COM Common -

4.4. RS-485 terminal configuration

Connect RS-485A, RS-485B of CN17 to MODBUS Master terminal as shown below.

equipment terminal name Master terminal name note RS485A ‘TRXD+’ or ‘A’ or ‘P’ RS485B ‘TRXD-’ or ‘B’ or ‘N’

- It would be desirable to use a cable exclusively for RS-485.

- If there is no GTD5000F(TxP) RS485 Option, the corresponding function does not work.

4.5. installation cable length

8 is a view explaining the calculation of the installation cable length of the explosion-proof suction type gas detection device using a pyrolysis device according to the present disclosure.

The maximum length between GTD-5000F(TxP) and power supply is determined by wire specifications.

Maximum installed length = VMAXDROP ÷ IMAX ÷ WIRER/m ÷ 2

VMAXDROP: Maximum Power Loop Voltage Drop (=Power Supply voltage - min operating voltage)

IMAX : Maximum current value of GTD-5000F(TxP)

WIRER/m: The resistance of the wire (ohms/meter value available in wire manufacturer’s specification data sheet).

An example installation length using a 24V power supply and 16AWG is shown below.

GTD-5000F(TxP) minimum operating voltage = 18 Vdc

VMAXDROP = 24 - 18 = 6V

IMAX = 0.55A ( 550mA )

6 ÷ 0.55 ÷ 0.01318 ÷ 2 = 413.8502 m ≒ 413 m

The power cable installation length by cable classification is shown in the table below.

AWG mm ² Copper resistance (ohms/m) Meters 12 3.31 0.00521 1046 14 2.08 0.00828 658 16 1.31 0.01318 413 18 0.82 0.02095 260 20 0.518 0.0333 163

5. Operation

5.1. Power On

After checking the wiring and power supply voltage, turn on the power switch on the front panel.

Power LED (Green) lights up, Version information, type of installed sensor (CT-S : Cartridge type Sensor), “SELF” message for loading sensor data is displayed, and after displaying “R180 ~ R001”, it returns to Measure state. is converted

The required time is about 180 sec. If you press RST (reset key) while “R180 ~ R001” is flashing, “R04~R01” is displayed and it is converted to measurement state.

When the power switch is turned on, the PWR LED is turned on, and “VX.XX” Firmware Version information is displayed on the FND (density display) for 1 sec.


The type of sensor installed in the model is displayed.
It means Cartridge type Sensor.

“R180 ~ R001” message is displayed for 180 sec while exchanging information between the initial sensor and the main body. At this time, press the RST key to enter the measurement mode immediately.



~

When Sensor Warming-Up is finished, it counts from R4 to R1 and enters the measurement state.
The count display is always displayed when entering measurement mode from other modes.

5.2. Gas Measuring Mode (Measuring Mode)

The gas concentration received from the sensor is displayed as a number on the FND Digit display, and the current flow rate is displayed as a bar graph.

If there is a problem with the sensor, letters such as “E-10” to “E-34” are displayed flickering and the Trouble LED (Orange) is turned on.
(Refer to 8. Error & Warning Message (Troubleshooting))

When the gas concentration value inputted from the sensor is more than 10% higher than the set High Scale value, the character “OUER” flickers at 0.5 Sec intervals.
If the gas concentration value is recognized as more than the alarm set value and the alarm delay time is greater than the alarm function, the alarm function operates.
The Alarm LED Lamp operation flickers at 0.5 Sec intervals while the alarm delay time is being counted, and turns on when the alarm delay time is exceeded.
Alarm relay turns ON when alarm delay time is exceeded.
When the alarm latch type is “ON”, the alarm state and gas concentration value are maintained (expressed) as the maximum measurable value when the alarm function is operated, and it is not released even if the gas concentration falls below the alarm value, and must be pressed with the “Reset” key. should be released
When the alarm latch type is “OFF”, the alarm function automatically operates according to the gas concentration.

5.3. Internal Mode Configuration

If you press and hold the “FUNC” key for more than 2 sec in the measurement state, it enters the password request step.




During the password request step, “PSWD” (Password mode) and password input display ( [ - - ] ) blink alternately at 0.5s intervals.
It is the initial value when shipped from the factory ( [ - - ] = [00] ) and can be changed from ( [00] to [99] ). Enter the password and press the FUNC (Function) key to enter each mode. Each mode can be selected using the UP key or the DOWN key.

It is possible to enter the internal mode by using the UP key or the DOWN key.
Internal mode can be configured as CONF, PRGM, CALB, ALARM, etc.

6.System Mode

6.1. mode configuration

The equipment consists of the following menu structure.

division menu display explanation note CONFIGURATION MODE CONF Internal feature configuration settings PROGRAM MODE PRGM Settings related to gas measurement CALIBRATION MODE CALB gas calibration ALARM MODE ALAM set alarm TIME MODE TIME time change Factory Mode SENSOR DATA MODE S-DT sensor data output Factory Mode TEST TEST MODE test mode Factory Mode FLOW MODE FLOW Flow operation setting mode Factory Mode MAINTENANCE MODE M-T Internal feature configuration settings Factory Mode NETWORK MODE nEt Ethernet settings related to POE Factory Mode ADJUST MODE ADJ 4-20mA output and flow calibration Factory Mode

6.2 Detailed Menu Configuration

The overall menu structure of the equipment is as follows.

Level 1 Level2 Level3 Default CONF 485 YES/NO is automatically displayed depending on whether the OPTION BOARD is installed (YES when installed) - HART - ADD(Address) OFF, 1~64 (Address when using 485 Modbus communication) One PSWD (Password) 0~99 (password setting) 00 Calibration Time (C-TM) OFF, 1~12 (Gas detector calibration cycle set in months) OFF SKIP (Skip) OFF, 1 to 20 (Measurement gas value suppression rate, operating at 20% of full range) 03% Pyrolyzer (PYRO) ON, OFF (setting whether to use Pyrolyzer current consumption) OFF V1.25(Version) Firmware version indication - END - - PRGM UNIT PPM, PPB, %VOL, %LEL %LEL DP-S(Decimal Point) 1000, 100 . 0, 10 . 00, 1 . 000 (set the number of digits of the measured value) 100 H-SL(High Scale) 1 to 9999 (measurement full range (high scale) setting) 100 END - - CALB ZERO NO, YES NO 0 Zero current measured value - WAIT (Wait) - - GOOD (Good) Good, Fail - 0 Measured value after zero calibration - SPAN NO, YES NO 50 Set standard gas value for SPAN calibration 50%/F.R. 45 current reading WAIT (Wait) GOOD (Good) Good if Calibration succeeds, Fail if it fails - 50 Measured value after Span Calibration - END - - ALAM Latching ON, OFF OFF Energizer (EN-Z) ON, OFF OFF AL-1 (Alarm 1) 1 to 90% of Full Range setting 20%/F.R. 1H/1L (Alarm operation direction) H: Rise Alarm / L: Fall Alarm 1H 1H00/1L00 (Dead band) 0~10%/Full Range 1H00 AL1T (Alarm1 time) 0~30sec (Alarm delay time) One A1RL (Alarm1 Relay) ON, OFF (Relay usage setting) ON AL-2 (Alarm 2) 1 to 100% setting of Full Range 40%/F.S. 2H/ 2L (Alarm operation direction) H: Rise Alarm / L: Fall Alarm 2H 2H00/2L00 (Dead band) 0~10%/Full Range 2H00 AL2T (Alarm2 time) 0~30sec (Alarm delay time) One A2RL (Alarm2 Relay) ON, OFF (Relay usage setting) ON END - -

6.3. Body environment setting (Configuration Mode)

If you press and hold the “FUNC” key for more than 2 sec in the measurement state, it enters the password request step.




During the password request step, “PSWD” (Password mode) and password input display ( [ - - ] ) blink alternately at 0.5s intervals, and the MAINT LED turns on.
It is the initial value when shipped from the factory ( [ - - ] = [00] ) and can be changed from ( [00] to [99] ). Enter the password and press the FUNC (Function) key to enter each mode. Each mode can be selected using the UP key or the DOWN key.
Select “CONF” (Configuration mode) using the UP key or DOWN key and press the “FUNC” key to enter the configuration mode of the main body.



You can see whether RS485 MODBUS BOARD is installed.
If the RS485 board is installed, 485 and YES blink alternately.
If the RS485 board is not installed, 485 and NO blink alternately at min flow rate.

When communicating data (RS-485, etc.), a unique address is required for the gas detector. This is the mode to set the address.
Press the ”FUNC” key to enter the address setting function.
For address input, the numeric value increases or decreases whenever the UP key or DOWN key is pressed. The setting range is available from 1 to 64, and the initial value is 1.
When the desired address (number) is displayed, press the “FUNC” key to set the address value and move to the next item.
PSWD (Password mode) mode.
It is a password mode for granting permission to change the data of the gas detector, and the password number increases or decreases whenever the UP key or DOWN key is pressed.
The password setting range is from 00 to 99, and the initial value is [00].
When the desired password is displayed, press the “FUNC” key to set the password and move to the next item.
This is the mode to set the sensor calibration cycle by month, and the number increases or decreases whenever the UP key or DOWN key is pressed. The calibration cycle setting range is 01 to 12 months, and the initial value is OFF (not used).
When the desired number of months is displayed, press the “FUNC” key to set the calibration cycle and move to the next item.

SKIP (skip) Mode is a mode to set the suppression percentage that the gas concentration should be displayed as '0' when displaying the gas concentration. Whenever the UP key or the DOWN key is pressed, the percentage number increases or decreases. (Initial value: OFF) The setting range is within 1% to 20% of the full range, and the initial value is OFF.
When the desired percentage is displayed, press the “FUNC” key to set the suppression percentage number and move to the next item.
This is the mode to set whether to use the Pyrolyzer or not, and use the UP key or DOWN key to set whether or not to use it.
Select ON when using Pyrolyzer and OFF when not using. Pressing “FUNC” key sets the selected function and moves to the next item.
This mode displays the program version.
When “FUNC” key is pressed, “End”, the next indication, is displayed, and when “FUNC” key is pressed, the menu mode (Menu mode) is entered.
It means that setting and changing of Configuration Mode has been completed. Press “FUNC” key to convert to menu mode.

6.4. Program setting

Press and hold “FUNC” key for more than 2 sec in gas concentration display mode to enter menu selection mode.
Select “PRGM” (Program mode) by using UP key or DOWN key and press “FUNC” key to enter program setting mode.

This is the mode to set the gas concentration measurement unit.


Whenever the UP key or the DOWN key is pressed, the unit LED on the right side changes. There are 4 types of units of measurement (PPM, PPB, %VOL, %LEL), and the initial unit (Unit) is %LEL.
If you press “FUNC” key when the desired measurement unit LED is flickering, the measurement unit is set and it moves to the next item.

Decimal point position setting message of gas concentration number is displayed as “DP-S” (Decimal point).
Press the ”FUNC” key to enter the decimal point setting function.



The decimal point is used when it is necessary to change according to the measurement range, and when setting the decimal point position, the decimal point position is changed to 4 types each time the UP key or the DOWN key is pressed. (0.000, 00.00, 000.0, 0000)
When the desired decimal point position is displayed, press “FUNC” key to set the decimal point position and move to the next item.

High scale setting function message, which is a function to set the maximum value of the measurement range, is displayed as “H-SL” (High scale).
Press ”FUNC” key to enter high scale setting function.
The high scale value is set within the range set by domestic laws and regulations at the time of product shipment.
The high scale value can change the setting value according to the measurement range, and the scale value increases or decreases whenever the UP key or the DOWN key is pressed.
When the desired high scale value is displayed, press the “FUNC” key to set the high scale value and move to the next item.

This means that the setting and changing of the Program Mode has been completed. Press “FUNC” key to convert to menu mode.

6.5. Zero Calibration

In measurement mode, press “FUNC” key for more than 2 sec to enter menu selection mode.
Select “CALB” (Calibration mode) using the UP key or DOWN key and press the “FUNC” key, the CAL LED at the bottom left turns ON and enters Calibration Mode.

Whether to select Zero Calibration is displayed. Press “FUNC” key to enter zero calibration mode.




Select “YES” using the UP key or DOWN key and press the “FUNC” key to display the concentration of the gas currently being measured.



Inject clean air into the sensor for about 1 minute at a flow rate of 300mL/min using a calibration tool.
When the measured value is stable after injecting gas, press the “FUNC” key to automatically perform zero calibration and display “WAIT”.



If calibration is successful, “GOOD” is displayed for 2 sec and converted to calibration concentration display mode.
Calibration If calibration is not successful, “FAIL” is displayed for 2 sec and converted to calibration concentration display mode.

If you press the “FUNC” key in the calibration concentration display mode, you will immediately enter the span calibration mode. When “RST” key is pressed, it moves to “CALB” (Calibration mode).

6.6. Sensitivity Calibration (Span Calibration)

In measurement mode, press “FUNC” key for more than 2 sec to enter menu selection mode.
Select “CALB” (Calibration mode) using the UP key or DOWN key and press the “FUNC” key, the CAL LED on the lower left turns ON, and enters Calibration Mode.

Select “SPAN” (Span Calibration mode) by using UP key or DOWN key, and press “FUNC” key to enter Span Calibration mode.



Select whether or not to proceed with span calibration. After selecting “YES” by using the UP key or DOWN key, press the “FUNC” key.

It is a mode to set the standard gas value when the concentration number is blinking. Use the UP key or DOWN key to set the value and press the “FUNC” key.



Inject the standard gas into the sensor for about 90 seconds at a flow rate of 300mL/min using a calibration tool. When the measured value is stable after injecting gas, press the “FUNC” key to automatically perform span calibration and display “WAIT”.



If calibration is successful, "G00D" is displayed for 2 sec and converted to calibration concentration display mode.
If Calibration is not successful, “FAIL” is displayed for 2 sec and converted to Calibration Concentration Mode.


In calibration concentration display mode, press “FUNC” key to display “End” and press “FUNC” key again to convert to “CALB” Mode.

It means that the setting and change of Calibration Mode is completed. Press “FUNC” key to convert to menu mode.

6.7. Alarm data setting (Alarm mode)

Press “FUNC” key for more than 2 sec in gas concentration display mode to enter menu selection mode.
Select “ALAM” (Alarm mode) using UP key or DOWN key and press “FUNC” key to enter Alarm setting mode.

This is the mode to set the alarm latch type (Latch). Press “FUNC” key to enter LACH setting mode.


Mode is changed to “ON” and “OFF” whenever UP key or DOWN key is pressed.
When the desired Alarm latch type is displayed, press the “FUNC” key to set the Alarm latch type and move to the next item.
Alarm latch type has two functions, “ON” and “OFF”. In case of OFF, the alarm is automatically reset.
This is the mode to set the Energizer function of Trouble/Alarm relay. Press “FUNC” key to enter Alarm relay Energizer setting mode.


Mode is changed to “ON” and “OFF” whenever UP key or DOWN key is pressed.
When the desired Energizer mode is displayed, press the “FUNC” key to set the Energizer mode and move to the next item.
Energizer mode has two functions, “ON” and “OFF”. In case of OFF, the relay automatically connects the contact in case of Trouble/Alarm while the contact connection is OFF. The connection is turned OFF.
Alarm 1 setting function message is displayed as “AL-1”
This is the mode to set the value of Alarm1 Level, and the setting range can be set within 90% of 1~High Scale.
Whenever UP key or DOWN key is pressed, Alarm1 value increases or decreases.
When the desired Alarm1 value is displayed, press the “FUNC” key to set the Alarm1 value and move to the next item.
The alarm level is set to the concentration set by domestic laws and regulations when the product is shipped.
This is the mode to set the direction in which Alarm1 operates, and “1H” or “1L” is displayed whenever the UP key or DOWN key is pressed.
“1H” operates when it is greater than or equal to Alarm1 setting value, and “1L” Mode operates when it is less than or equal to Alarm1 setting value.
When the desired Mode is displayed, press “FUNC” key to set and move to the next item. This is the mode to set the dead band value in which Alarm1 operates. Use the UP key or DOWN key to set the value.
When Alarm1 is in “1H” Mode, Alarm1 operates when the alarm value is equal to or greater than the dead band value and is released when the value is equal to or less than the alarm value minus the dead band value.
When Alarm1 is “1L”, Alarm1 operates below the value of Alarm value minus the Dead band value, and is released when it exceeds the value of Alarm1 plus Dead band value.
When the desired Alarm1 dead band value is displayed, press “FUNC” key to set and move to the next item.
This function is a function that gives a hysteresis value to eliminate this phenomenon, when the gas concentration value reaches the vicinity of the Alarm1 set value, and the Alarm1 alarm operates repeatedly On/Off. It is set to 0 at the time of shipment from the factory.
Example) If the alarm setting value is 20%LEL / Dead band: 2%LEL, the alarm is generated at 22%LEL based on 20%LEL and released at 18%LEL.
Alarm1 delay time setting function message is displayed as “AL1T”.
Gas detector is a function to prevent momentary malfunction due to external impact and noise, not normal operation, and the time setting range can be set within 0~30sec.
Alarm1 delay time setting increases or decreases by Sec unit whenever the UP key or DOWN key is pressed.
When the desired Alarm1 delay time is displayed, press “FUNC” key to set the Alarm1 delay time and move to the next item.
Example) In case of alarm set value: 20% LEL / Delay time: 5 Sec, an alarm is generated when the measured value exceeds the alarm set value for more than 5 Sec based on 20% LEL, and the alarm set value within 5 Sec If it goes below this, no alarm is generated.
Alarm1 (Relay) contact output setting function message is displayed as “A1RL”. This is the mode to set the Alarm1 contact output and changes to “ON” and “OFF” whenever the UP key or DOWN key is pressed.
Select the desired Alarm1 contact output method and press the “FUNC” key to set the Alarm1 contact output mode and move to the next item.
Alarm1 contact output mode has two functions, “ON” and “OFF”. In OFF, Alarm1 contact is not output, and in case of ON, Alarm1 contact is output.

Alarm2 value setting function message is displayed as “AL-2”.

This is the mode to set the Alarm2 Level value, and the setting range can be set within 100% of 1~High Scale.
Whenever UP key or DOWN key is pressed, Alarm2 value increases or decreases.
When the desired Alarm2 value is displayed, press the “FUNC” key to set the Alarm2 value and move to the next item.
The alarm level is set to the concentration set by domestic laws and regulations at the time of product shipment.

This is the mode to set the operating direction of Alarm2, and “2H” or “2L” is displayed whenever the UP key or DOWN key is pressed.
“2H” Mode is the mode that operates when the value is greater than or equal to the Alarm2 setting value, and “2L” Mode is the mode that operates when the value is less than or equal to the setting value of Alarm2.
When the desired Mode is displayed, press “FUNC” key to set and move to the next item.

This is the mode to set the dead band value in which Alarm2 operates. Use the UP key or DOWN key to set the value.
When Alarm2 is in “2H” Mode, Alarm2 operates above the value of Alarm plus the Dead band value and is released below the value of the Dead band minus the value of Alarm2.
When Alarm2 is in “2L” Mode, Alarm2 operates below the value of Alarm2 minus the dead band value, and is released when the value of Alarm2 plus the value of the dead band exceeds.
When the desired Alarm2 dead band value is displayed, press “FUNC” key to set and move to the next item.
This function is a function that gives a hysteresis value to eliminate this phenomenon, when the concentration value reaches the vicinity of the Alarm2 setting value, and the Alarm2 alarm operates by repeating ON/OFF. It is set to 0 at the time of shipment from the factory.
Example) If the alarm setting value is 20%LEL / Dead band: 2%LEL, the alarm is generated at 22%LEL based on 20%LEL and released at 18%LEL.
Alarm2 delay time setting function message is displayed as “AL2T”. Gas detector is a function to prevent momentary malfunction due to external impact and noise, not normal operation, and the time setting range can be set within 0~30sec.
Alarm2 delay time setting increases or decreases Alarm2 delay time by Sec unit whenever UP key or DOWN key is pressed.
When the desired Alarm2 delay time is displayed, press “FUNC” key to set the Alarm2 delay time and move to the next item.
Example) In case of alarm set value: 20% LEL / Delay time: 5 Sec, an alarm is generated when the measured value exceeds the alarm set value for more than 5 Sec based on 20% LEL, and the alarm set value within 5 Sec If it goes below this, no alarm is generated.
Alarm2 (Relay) contact output setting function message is displayed as “A2RL”. This is the mode to set the alarm 2 contact output and is changed to “ON” and “OFF” whenever the UP key or DOWN key is pressed.
Select the desired Alarm2 contact output method and press the “FUNC” key to set the Alarm2 contact output mode and move to the next item.
Alarm2 contact output mode has two functions, “ON” and “OFF”. When OFF, the Alarm2 contact is not output, and when it is ON, the Alarm2 contact is output.

This means that the setting and changing of the Alarm Mode has been completed. Press “FUNC” key to convert to menu mode.

7.Troubleshooting

7.1. Fault List

Fault Description & Condition Causes E-10 When the Sensor Cartridge is not installed in the body or is defective 1) Poor connection of Sensor Cartridge
2) Defective Sensor Cartridge Unit E-11 When there is no communication between the main body and the Sensor Cartridge 1) Defective Sensor Cartridge Unit
2) Defective body E-12 When there is no gas sensor in the sensor cartridge Defective Sensor Cartridge Unit E-13 When the EEPROM of the Sensor PCB is bad Defective Sensor Cartridge EEPROM E-14 When the sensor is in poor condition during sensor self-diagnosis Failure of the gas sensor function in the sensor cartridge E-20 When the flow sensor does not work Failure of the flow sensor in the Main Unit E-21 When the flow rate of the flow sensor is low If the flow value is measured below 0% E-22 When the flow rate of the flow sensor is high If the flow value is measured above 120% E-23 When the flow rate of the flow sensor is lower than the low level (250ml) When the flow rate is measured below the low level (when L-FL is on) E-30 When Pyrolyzer current is measured below 50mA 1) Poor Pyrolyzer connection
2) Failure of the heating wire inside the Pyrolyzer E-31 When the internal EEPROM of the main body is not recognized EEPROM failure in Main Board E-32 When the Pyrolyzer current measures over 900mA 1) Check gas sensor measurement status
2) Check whether input power noise is inflow
3) Defective Sensor Cartridge Unit
4) Defective body E-34 If the gas measurement value is continuously hunting 1) Check gas sensor measurement status
2) Check whether input power noise is inflow
3) Defective Sensor Cartridge Unit
4) Defective body

7.2. Warning Code

Warning Description & Condition Causes W-01 When the calibration validity period has passed Sensor expiration date exceeded W-02 When the manufacturing date of the sensor is not entered Sensor manufacturing date error

7.3. Recovery List

No Causes countermeasures One Wrong Calibration Parameter 1) Implementation of recalibration
2) If the same symptoms are found after recalibration, replace the sensor unit 2 Sensor Cartridge connection failure 1) Check the sensor cartridge connection connector status
2) Replace Sensor Cartridge 3 Defective Sensor Cartridge Unit Replace Sensor Cartridge 4 Body defect body replacement 5 Defective Sensor Cartridge EEPROM 1) Modify and recalibrate parameters after memory initialization
2) When the same phenomenon occurs, replace the sensor cartridge 6 Sensor Cartridge gas sensor function failure Sensor Cartridge Gas Sensor Replacement 7 Failure of the flow sensor in the Main Unit body replacement 8 If the flow rate is measured below 0% 1) Check inlet and outlet flow conditions
2) If the internal flow path is not clogged, replace the main body 9 If the flow rate is measured above 120% body replacement 10 Poor connection to Pyrolyzer 1) Check the condition of the Pyrolyzer connection connector
2) Replace the Pyrolyzer if there is no problem with the connector 11 Pyrolyzer internal heating wire failure Replace Pyrolyzer 12 EEPROM failure in Main Board 1) Modify and recalibrate parameters after memory initialization
2) Replace the body when the same phenomenon occurs 13 Pyrolyzer failure Replace Pyrolyzer 14 Body defect body replacement 15 Sensor expiration date exceeded Sensor recalibration or sensor replacement 16 Sensor manufacturing date error Recalibrate the sensor or contact the manufacturer

8. Interface configuration

8.1. MODBUS RS485

8.1.1. Interface setting

Data Format: RTU

Baud rate: 9600 bps

Data bits: 8bits

Stop bit: 1 bits

Parity: Even

For other details, refer to www.modbus.org.

8.1.2. MODBUS RS485 Address map

division Address Bits Description Measured gas concentration 30001 BIT15~0 Gas measurement value (integer type / Decimal Point not considered) High Scale setting value 30002 BIT15~0 High Scale setting value (integer type / Decimal Point is not considered) 1st Alarm set value 30003 BIT15~0 1st alarm set value (integer type / Decimal Point is not considered) 2nd Alarm set value 30004 BIT15~0 2nd alarm setting value (integer type / Decimal Point is not considered) Gas detector
state value 10001 BIT0 Alarm1 10002 BIT1 Alarm2 10003 BIT2 Fault Bit 10004 BIT3 MENU Mode (Menu Entry Flag) 10005 BIT4 Test 10006 BIT5 CAL 10007 BIT6 Reserved 10008 BIT7 Toggle Bit (Invert bit at 2 Sec intervals) Test Pattern On 3 Bit0-7 Gas Detector Test Pattern On (GAS Highscale value), Write 0xFF Normal Restart 2 Bit0-7 Gas Detector Normal Operation restart, Write 0x00

8.2. MODBUS TCP/IP

8.2.1. Interface setting

MODBUS Port Number 502

For other details, refer to www.modbus.org.

8.2.2. MODBUS TCP/IP Address map

division Address Bits Description Gas detector
state value 1 40001 BIT0~3 Monitoring state 0: Warm up 1: Measurement Mode 2: Measurement mode in which alarm output is prohibited 3: Reserved 4: Reserved 5: Reserved 6: Reserved 7: 4~20mA Calibration Mode 8: Flow Calibration Mode 9~15: Reserved BIT4 Fault Active state BIT5 Reserve BIT6 Alarm1 Active state BIT7 Alarm2 Active state BIT8 Alarm1 Relay Active Status BIT9 Alarm2 Relay Active Status BIT10 Fault Relay Active State BIT11 Toggle Bit (Invert bit at 2 Sec intervals) BIT12 GAS Over state BIT13~15 Reserved Heart Bit 40002 BIT0~15 Increases by 1 every second from 0 to 65535 real gas measurement 40003 BIT0~15 Gas Concentration in floating point format word 1 of 2 40004 BIT0~15 Gas Concentration in floating point format word 2 of 2 Integer gas measurements 40005 BIT0~15 Gas Concentration in integer Format (Integer type / Decimal Point is not considered) Error Code 40006 BIT0~15 Error Code Decimal point
and units 40007 BIT0~2 Decimal point indicator 0: 0 Point 1: 1 Point 2: 2 Points 3: 3 Points 4~7: Reserved BIT3~7 Reserved Bit8~11 Concentration units 0: Reserved 1: PPM 2: PPB 3: Reserved 4: %Volume 5~7: Reserved 8: %LEL BIT12~15 Reserved Gas detector
temperature reading 40008 BIT0~15 Temp(Signed 16bit Integer) O2 sensor Reserved 40009 BIT0~15 Reserved Reserved 40010 BIT0~15 Reserved Flow measurement 40011 BIT0~15 Flow measurement Reserved 40012 BIT0~15 Reserved 1st real number
Alarm set value 40013 BIT0~15 Alarm1 Value in floating point format word 1 of 2 40014 BIT0~15 Alarm1 Value in floating point format word 2 of 2 2nd real number
Alarm set value 40015 BIT0~15 Alarm2 Value in floating point format word 1 of 2 40016 BIT0~15 Alarm2 Value in floating point format word 2 of 2 Reserved 40017 BIT0~15 Reserved Reserved 40018 BIT0~15 Reserved Gas detector state value 2 40019 BIT0 Alarm1 BIT1 Alarm2 BIT2 Fault Bit BIT3 MAINTENANCE (maintenance mode) BIT4 TEST BIT5 CAL BIT6 Reserved BIT7 Sensor Cartridge Error Bit BIT8 Flow Error Bit BIT9 Internal Communication Error BIT10 Pyrolyzer Error Bit BIT11~15 Reserved Real number type High Scale setting value 40020 BIT0~15 High Scale Value in floating point format word 1 of 2 40021 BIT0~15 High Scale Value in floating point format word 2 of 2 Gas detector state value 2 10001 BIT0 Alarm1 10002 BIT1 Alarm2 10003 BIT2 Fault Bit 10004 BIT3 MENU Mode (Menu Entry Flag) 10005 BIT4 TEST 10006 BIT5 CAL 10007 BIT6 Reserved 10008 BIT7 Toggle Bit (Invert bit at 2 Sec intervals)

9. Outline drawing and dimensions

9.1. GTD-5000F(TxP) outline drawing and dimensions

9 is a view showing the appearance and dimensions of an explosion-proof suction type gas detection device using a thermal decomposer according to the present disclosure.

10. Precautions before installation

10.1. Selection of installation site (industrial safety and health law data)

The places where the gas leak detection alarm should be installed are as follows.

- Compressors, valves, reactors, pipe connections that handle combustible and toxic substances installed inside and outside buildings, and around chemical facilities and auxiliary facilities where gas leakage is a concern.

- A place where gas is likely to stay around manufacturing facilities with ignition sources such as heating furnaces

- Around the connection part of facilities for filling flammable and toxic substances

- Substation room, switchboard room, control room, etc. located in the explosion-proof area

- Other places where gas tends to stay

10.2. Selection of installation location (high pressure gas safety management law data)

The gas detector of the gas leak detection alarm should be installed as close to the leaking area as possible. However, direct gas leakage is not expected, but the place where gas leaked from the surroundings is easy to stay should be installed at the point as in 1 of each of the following subparagraphs.

- Gas leak detection alarm installed outside the building is installed at a point where gas is likely to stay in consideration of wind direction, wind speed, and specific gravity of gas.

- A gas leak detection alarm installed in a building should be installed at the bottom of the building when the specific gravity of the gas to be detected is heavier than air, and near the ventilation hole of the building or at the top of the building when it is lighter than air.

- The gas leak detection alarm should be installed where the gas detector is installed and where workers reside.

10.3. Precautions when installing

It should be installed away from locations that may cause electrical obstacles such as rainwater, and it is recommended to install it in a place where work is easy because periodic maintenance is required. Places with vibrations or shocks can affect the output value, so avoid places with vibrations or shocks and install them so that the sensor part faces the direction of gravity.

- The device according to the present disclosure is an explosion-proof structure and belongs to GROUP II for gas and steam in general workplaces and chemical plants, and is classified as Zone 1 (ONE)-1 hazardous location and ZONE 2 (TWO)-2 Can be used in hazardous locations.

- The permissible temperature belongs to 85℃ or less corresponding to T6.

- Use the ambient temperature in the range of -10℃ ~ 60℃.

- Installation height: below 1,000m above sea level

- Relative Humidity: 5% to 99% (Non-condensing)

- Installation location: outdoor and indoor

- Explosive flammability of target gas or vapor: Ex d IIC T6

- When wiring connection works, use explosion-proof cable glands at the cable inlet or seal the conduit to prevent gas lamps from moving through the conduit within 50mm or propagation of flame in the event of an explosion when performing metal conduit wiring work (sealing) Sealing), and all materials and materials used for closing unused lead-ins must be products that have passed safety certification.

- When connecting this device and conduit, more than 5 threads must be combined.

- Work must be performed under conditions that satisfy the standards for selection, installation, and maintenance of explosion-proof electrical machinery and equipment wiring at other workplaces.

10 is an exemplary view showing a pressure-resistant packing type seal.

11 is an exemplary view showing sealing Y sealing compound.

The description of the presented embodiments is provided to enable any person skilled in the art to use or practice the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments without departing from the scope of the present invention. Thus, the present invention is not to be limited to the embodiments presented herein, but is to be construed in the widest scope consistent with the principles and novel features presented herein.

Claims (1)

As an explosion-proof suction type gas detection device using a pyrolysis device,
a sampling and sensor unit configured to inhale, pyrolyze, and sense the gas;
a main unit configured to measure gas concentration and flow rate through the sampling and sensor unit and to control the gas sensing device;
a display unit configured to display measured values of the gas concentration and flow rate; and
Including a terminal unit for outputting a signal to the outside of the gas detection device,
gas detection device.