GASTRON GTC-520F User manual

GTC-520F
Instruction Manual
Headquarters / Engineering research laboratory :
23 Gunpo Advance d Industry 1-ro(Bugok-dong), Gunpo-si, Gyeonggi-do
Tel [phone] Fax [phone]
Yeongnam business office / Plant :
55 Gonghangap-gil 85beon-gil, Gangseogu, Busan Metropolitan City
Tel [phone] Fax [phone]
E-mail : [email protected]
www.gastron.com
Read in detail for correct use.

Gas & Flame
Detection System
GTC-520F
Instruction Manual
www.gastron.com
02_03
We sincerely thank you for purchasing the product of Gastron Co. Ltd.
Our Gastron Co.Ltd. is a company specialized in Gas Detector & Gas Monitoring System and have been
recognized by many customers for the best quality and use convenience. We always seek to help our
customers to find the product they need and we continuously research to develop gas detectors that
satisfies our customers. From now on, you can solve all problems related to gas detectors with the
products of Gastron. We Gastron, will be responsible for your satisfaction.
This user manual describes operation and simple maintenance methods etc. for the gas detector.
Please read carefully and store it in a safe place. Using it as a reference will help a lot when you have a
question during use.
* KOSHA GUIDE : P-135/6-2018
Calibration must be performed at a frequency requested by the manufacturer and shall be performed quarterly when
the calibration period is not specified.
In case of a problem after purchasing the product,
please contact the address below.
·Address : 23 Gunpo Advanced Industry 1-ro,
Gunpo-si, Gyeonggi-do
·Tel : [phone]
·Fax : [phone]
·URL : www.gastron.com
·e-mail : [email protected]
The product and manual are subject to change without a notice for the product's functional improvement and ease of use.
■ For an accurate operation of the gas detector, please perform an inspection and a calibration at
least once every 6 months.
( * In reference to KOSHA GUIDE: P-135/6-2018 / 7.2 In-house inspection, section 2)
■ For an accurate operation of the gas detector, inspection and calibration using a reference gas
before measurement is recommended.
■ Failure to calibrate may result in malfunction of the equipment due to aging of the sensor.
■ Only an individual specialized in gas detector may disassemble the device.
■ Wire specification for the power cable must be decided in reference to the "Installation cable length"
section.
■ Please contact our company's technical support, e-mail, or website for inquiries related to
inspection and calibration of the gas detector.
Greetings

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04_05
ContentsContents
GTC-520F
Instruction Manual
6.5.8. Factory Initialization mode ····························································· 34
6.5.9. Calibration Data Initialization Mode ······················································ 35
7. Interface configuration ············································································· 36
7.1. MODBUS RS485 ················································································ 36
7.1.1. Interface setting ········································································ 36
7.1.2. MODBUS RS485 Register map ·························································· 36
8. Drawings and Dimension ·········································································· 37
9. Precautions before Installation ····································································· 38
9.1. Selecting a Place for Installation (Occupational Health & Safety Act Data) ····························· 38
9.2. Selecting a Site for Installation (High-Pressure Gas Safety Control Act Data) ·························· 38
9.3. Precautions before Installation ··································································· 38
10. Revision record ···················································································· 40
1. Overview ·························································································· 6
2. Features ··························································································· 6
3. Specifications······················································································ 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
5. Installation ························································································· 12
5.1. Power Configuration ·········································································· 12
5.2. Signal Terminal Configuration ·································································· 13
5.3. Relay Terminal Configuration ··································································· 14
5.4. 3-wire Type Gas detector Connection Method ·················································· 15
5.5. 2-wire Type Gas detector Connection Method ·················································· 15
6. Operation Method ················································································· 16
6.1. Power ON ···················································································· 16
6.2. Measuring Mode ·············································································· 16
6.3. Test Mode ··················································································· 17
6.4. Stand-by Mode ·············································································· 17
6.5. Operation Status Setting ······································································· 18
6.5.1. Setting Table ·········································································· 18
6.5.2. PROGRAM MODE ······································································ 20
6.5.3. ALARM Mode ·········································································· 23
6.5.4. Option mode (Option setting) ···························································· 27
6.5.5. Test Mode ············································································· 29
6.5.6. 485 setting mode ······································································ 31
6.5.7. Maintenance mode ····································································· 32

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06_07
GTC-520F
Instruction Manual 3. Specications
Receiver of GTC-520F is a receiver with high-performance A/D converter and micro-processor and has various
functions built-in. The receiver of GTC-520F is a stand-alone type that is connected to one detector and is protected
by a case made of ABS material. It displays the concentration using FND digital display and 3-color bar graphic LED.
It has primary, secondary, and tertiary alarm functions and fault alarm function.
In an event of error, GTC-520F stand-alone receiver displays audible signal (buzzer) and visible signal (Alarm LED)
and has a function to hold the maximum measured value. GTC-520F receiver can be controlled remotely to release
the alarm and can perform associated control functions since it has an output for an error (SPDT contact). GTC-520F
receiver provides 4-20mA. DC output for the measured value and is able to communicate digitally using RS-485
network signal (Option).
3.1. Basic Specifications
ITEMS SPECIFICATION
Measuring Value Display 4-Digit FND (32 segment)
Measuring Range Capable to display 000.0 ~ 9999
Alarm Indicator
Visible Indicator: 3-Alarm, Trouble LED, Warning Light
Audible Indicator: Buzzer Signal (85 dB)
Alarm output Signal 3-Level Alarm, Trouble Relay
Reset signal RESET Switch and Remote Reset Control
Input signal 4~20 mA DC
Output signal Isolated RS-485 Modbus (Option)
Approvals Classification CE
Basic Interface Analog 4-20mA current interface
Option MODBUS RS485 Board
Warranty Transmitter 2Year
Sensor 1Year
ITEMS SPECIFICATION
Dimension 135(W) × 180(H) × 81 (D) mm
Weight including Sensor App. 0.6kg
Mounting type Wall mount
Body material ABS
3.2. Mechanical Specifications
2. Characteristics
1. Overview

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08_09
GTC-520F
Instruction Manual
3.3. Electrical Specifications (Standard Type)
ITEMS SPECIFICATION
Input Voltage(AC Type/Standard)
Absolute min:
Nominal:
Absolute max:
AC 90V
AC 220V
AC 250V
Input Voltage(DC Type)
※ 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(DC Type) Max. wattage:
Max. current:
4.32W @+24 VDC
180mA @+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
Relay contact Alarm1, Alarm2, Alarm3, Fault Relay
AC250V 5A Relay contact(SPDT)
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:
3.4. Environmental Specifications
ITEMS SPECIFICATION
Operation Temperature -20 to 60 ℃
Storage Temperature -20 to 60 ℃
Operation Humidity 5 to 99% RH (Non-condensing)
Pressure Range 90 to 110KPa
3. Specications 4. Name and Description of Each Part
[Figure 1. GTC-520F Components]

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Instruction Manual
No ITEMS SPECIFICATION
1Case cover It fixes ALDC 040614 Main PCB and protects the circuit from surrounding environment and
external shock.
2Case body It fixes ALDC 040614 display and protects the circuit from surrounding environment and
external shock.
3Marking label It labels brief information such as model name, explosion-proof grade, etc.
4Mount hole(2-Ø10) It is a hole to fix the control unit to an external wall or other mount plate.
5Concentration Display
(FND Digital Display)
It displays measurement from a detector connected to each channel in a continuous manner.
During test, it displays user defined value with flickering.
6External Function Switch "FUNC" S/W is a key to input data by changing and selecting threshold, type, dead band,
dwell, and etc. settings of the alarm. It is controlled externally using a magnetic bar.
7External Test Switch
Pressing "TEST" S/W enters a mode that performs self-test.
Measurement FND flickers and the value can be adjusted using "TEST" S/W to check the
alarm operation status.
To release self-test, press buzzer stop and return switches. It is controlled externally using a
magnetic bar.
8External UP Switch
After selecting each mode using "FUNC" S/W, it is used to increase the set value or to select
the next setting. To change setting value in a large range, pressing "UP" S/W for a certain time
changes the value rapidly.
It is controlled externally with a magnetic bar.
9DOWN Switch
After selecting each mode using "FUNC" S/W, it is used to decrease the set value or to select
the previous setting. To change setting value in a large range, pressing "DOWN" S/W for a
certain time changes the value rapidly.
It is controlled externally with a magnetic bar.
10 Power LED When power is inputted, the power LED lights on.
11 Stand-by LED When the detector is in stand-by mode, STD-BY LED blinks.
12 Trouble LED When power is inputted, the power LED lights on.
When the detector is in stand-by mode, STD-BY LED blinks.
13 Alarm 3 LED When the tertiary alarm occurs, Alarm 3 LED lights on.
When it reaches Alarm 3 threshold during a test, Alarm 3 LED lights on.
14 Alarm 2 LED When the secondary alarm occurs, Alarm 2 LED lights on.
When it reaches Alarm 2 threshold during a test, Alarm 2 LED lights on.
15 Alarm 1 LED When the primary alarm occurs, Alarm 1 LED lights on.
When it reaches Alarm 1 threshold during a test, Alarm 1 LED lights on.
16 Buzzer Operates in a continuous tone upon an event of warning or fault during a test.
17 External POWER Switch S/W used to turn ON and OFF of the control unit power. When performing cable wiring work,
power must be turned OFF.
18 External Buzzer Stop /
Return Switch (Ack & Reset)
Used to stop the buzzer upon an event of A alarm Performs functions to release alarm, self-
test, and program setting, etc.
19 Internal Power
ON/OFF Switch
S/W used to turn ON and OFF of the control unit power. When performing cable wiring work,
power must be turned OFF.
20 Power Input Terminal Terminal for power cable connection for operation of the control unit.
No ITEMS SPECIFICATION
21 External Warning Light
Power Terminal
Assistance power terminal for installation of external warning light during operation of the
control unit.
22 Signal I/O terminal Used for connecting cables for power supply of gas leak detector, 4~20 mA current output,
and RS-485 MODBUS Network, etc.
23 Signal output terminal
Used for Relay Dry Contract Signal such as warning, failure, etc. and connecting Switch
Signal Output Cable, etc.
24 Power Input Terminal Terminal for power cable connection for operation of the control unit.
25 Internal UP Switch
After selecting each mode using "FUNC" S/W, it is used to increase the set value or to select
the next setting. To change setting value in a large range, pressing "UP" S/W for a certain
time changes the value rapidly.
It is controlled externally with a magnetic bar.
26 Internal DOWN Switch
After selecting each mode using "FUNC" S/W, it is used to decrease the set value or to select
the previous setting. To change setting value in a large range, pressing "DOWN" S/W for a
certain time changes the value rapidly.
It is controlled externally with a magnetic bar.
27 Internal Function Switch
"FUNC" key is a key to input data by changing and selecting threshold, type, dead band,
dwell, and etc. settings of the alarm.
It is controlled externally with a magnetic bar.
28 Internal Test Switch
Pressing "TEST" S/W enters a mode that performs self-test.
Measurement FND flickers and the value can be adjusted using "TEST" S/W to check the
alarm operation status.
To release self-test, press buzzer stop and return switches. It is controlled externally with a
magnetic bar.
29 Internal Reset Switch Performs functions to release alarm, self-test, and program setting, etc.
[Table 1. GTC-520F Description on configuration]
4. Name and Description of Each Part4. Name and Description of Each Part

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Instruction Manual
[Figure 3. CN6 Terminal Configuration]
5. Installation5. Installation
5.2. Signal Terminal Configuration
■ 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 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.
■
Using CN6 terminal, connect 4~20 mA output, External Reset, RS485, and external gas detector. Terminal
configuration is as shown in the table below.
■ RS-485 cable uses a cable designated for RS-485 and cables for 4~20 mA output and detector connection must
use a shield cable with CVVS or CVVSB 0.75 sq and higher.
5.1. Power Configuration
■ When it is desired to use DC24V, a separate request must be made when ordering the product. When the product
has been delivered as DC24V-Type upon a customer request, (+) and (-) of DC24V shall be connected to L1 and
L2 or CN9, respectively.
■
After detaching the equipment cover, terminal block that connects power and various signals within PCB appears.
■ Connect AC Power (85~260 V 50/60 Hz) to CN9 as shown in the figure below.
[Figure 2. GTC-520F Power Configuration]
[Table 2. CN6 단자 설명]
Note 1) When RS485 Option does not exist, RS485 function does not operate.
FUNCTION
OUTSIDE TERMINAL NAME DESCRIPTION
4-20mA
Output
VISO External power input terminal for 4~20 mA Sink Driver
mA Output terminal for 4~20 mA Source Driver
SENSOR
Combustible Sensor Toxic Sensor O2 Sensor
(Galvanic Method)
1Red Cable Blue Cable N.C
2White Cable Red Cable Red Cable
RESET +External Reset S/W + Terminal.
When + and - terminals short, alarm reset function operates.
-External Reset S/W - Terminal
RS485 ARS485 A Terminal (TRXD+ or P)
BRS485 B Terminal (TRXD+ or N)

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GTC-520F
Instruction Manual
5.3. Relay Terminal Configuration
■ Using CN5 terminal, it consists of 3 SPDT-type Alarm relay and 1 SPDT-type Trouble relay.
■ Alarm Lamp (LP) can connect DC external warning light.
■ LP terminal output DC +24V power regardless of AC, DC power mode. This is to use an external DC flash light
or external devices.
5. Installation5. Installation
FUNCTION PIN TERMINAL NAME DESCRIPTION
Alarm1
1NO Alarm1 Normal Open
2NC Alarm1 Normal Closed
3COM Alarm1 Common
Alarm2
4NO Alarm2 Normal Open
5NC Alarm2 Normal Closed
6COM Alarm2 Common
Alarm3
7NO Alarm3 Normal Open
8NC Alarm3 Normal Closed
9COM Alarm3 Common
Trouble
10 NO Trouble Normal Open
11 NC Trouble Normal Closed
12 COM Trouble Common
LP 13 +External Power (DC 24 V) + Output
14 -External Power (DC 24 V) - Output
[Table 3. CN5 Terminal Description]
[Figure 4. CN7 Terminal Configuration]
5.4. 3-wire type Gas detector Connection Method
5.5. 2-wire type Gas detector Connection Method
[Figure 5. 3-wire type gas detector]
[Figure 6. 2-wire type gas detector]
■ When the gas detector has 3-wire (V+, mA, V-) for power and
420 mA output components, connect to the Channel Unit as
shown in Figure 5.
■ Connecting cable must comprise of CVVS or shield cable with
CVVSB 0.7 sq or higher.
■ Our gas detector models in this type are TS-1100Ex, TS-
2000Ex, TS-2100 Series, TS-4000 Series, TS-4100P Series,
TS-5100 Series, GTD-1000 Series, GTD-2000 Series, GTD-
3000 Series, GIR-3000 Series.
■
When the gas detector output has 2-wire (V+, V- ), connect
to the Channel Unit as shown in Figure 6.
■ Connecting cable must comprise of CVVS or shield cable with
CVVSB 0.7 sq or higher.
■ Our gas detector models in this type are TS-1100Tx, TS-
2000Tx, TS- 3000 Series, TS-3100 Series.

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GTC-520F
Instruction Manual 6. Operation Method6. Operation Method
■ Check wirings for operation power, detection parts, alarm parts, and concentration display.
■ Check the power input then turn ON the power S/W.
■ Check whether power LED at alarm and concentration display parts light on.
■ Check whether "SELF" is displayed on FND concentration display part.
6.1. Power ON
- After GTC-520F power turns ON, the current firm ware version is displayed.
- VER is displayed for 0.5 sec on FND then number displays.
- The current version is 2.03.
- After warming-up by "SELF" flashing for approx. 30 sec on FND of concentration display,
it immediately enters the measurement mode.
- Upon an event of fault of the equipment or detector at this time, fault alarm appears.
■ After power on, when there is no error from "SELF TEST", it automatically enters Measuring Mode.
6.2. Measuring Mode
- Displays gas concentration received by the detector on FND digital display in numbers.
- Gas concentration is also displayed by 3-color bar graphic LED. Concentrations below the
primary alarm concentration in green, below the secondary alarm concentration in orange,
and above the secondary alarm concentration in red.
- 3-level alarm thresholds are always displayed by 3-color bar graphic LED. Alarm1 threshold
in green, Alarm2 threshold in orange, and alarm3 threshold in red.
- When the detector is not connected or input current from the detector is under 10% below the
set high scale value, "Undr" displays and flashes at 1 sec interval.
- Trouble LED lights on, warning light flashes, and buzzer sounds.
- When "BZSTOP" S/W is pressed, warning light lights on and buzzer stops.
- When the input current from the detector is over 10% above the set high scale value, "oUEr"
displays and flashes at 1 sec interval.
- Alarm 1, 2, 3 LED lights flickers, warning light flickers, and buzzer sounds.
- Top circular LED of the 3-Color bar graphic LED lights on red.
- When gas concentration is detected to be above the set value for alarm, alarm function counts
the dwell time and if it is above the set dwell time, alarm function operates.
- Alarm relay turns on when it is above the alarm dwell time.
- When Alarm Latch Type is at "ON" mode and alarm function runs, the alarm status and gas
concentration value stays at the maximum value. When gas concentration decreases below
the alarm value, alarm does not get released and "RESET" S/W must be ran to release it.
- When Alarm Latch Type is OFF, Alarm is released automatically in accordance to gas
concentration.
■ Pressing "TEST" S/W for 2 sec or longer in gas concentration display mode enters Test mode.
■ In test mode, when it passes 30 min after the last S/W control, it automatically returns to the gas concentration
display mode.
6.3. Test Mode
- When it enters Test mode, gas concentration number displays and flickers.
- This function enables testing at channel unit without injecting gas to the detector sensor. It can
set an arbitrary concentration when the user presses "Test" S/W and alarm function operates
normally with a user-defined concentration.
- When "FUNC" S/W is pressed 2 sec or longer, it enters FND / LED / Bar LED Test function.
- 3-Color bar graph LED displays green, orange, and red at 0.5 s interval and each function
LED flickers at 0.5 s interval.
- When "RESET" S/W is pressed, it returns to gas concentration display mode.
▼ ▲
Full Range
■ Pressing "DOWN" S/W for 2 sec or longer in gas concentration display mode enters Stand-by mode.
■ PWhen ETO (Emergency Time Out) is set to ON in Option Setting Mode, it automatically returns to gas
concentration display mode after 30 min.
■ When ETO is OFF, "DOWN(Stand-by)" S/W must be pressed 2 sec or longer to return to gas concentration
display mode.
6.4. Stand-by Mode
- In stand-by mode, STD-BY LED flickers. Trouble/Alarm relay of GTC-520F contact output
does not operate but all other functions run.
- When "DOWN(Stand-by)" S/W is pressed 2 sec or longer, it returns to gas concentration
display mode

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GTC-520F
Instruction Manual
6.5. Operation Setting
6.5.1. Setting Table
LEVEL1 LEVEL2 PARAMETER DEFAULT
(Decimal-Point) 100, 1.00, 10.0, 0.100 100
(High-Scale) 10~9999 100
-99 ~ 99 0
(Pass Word) 0~99 00
(End) - -
(LACH) ON, OFF ON
(Energizer) ON, OFF OFF
(Alarm Lamp) ON, OFF ON
(Alarm-1) 1~Full range 20%/F.R.
(1H) H, L H
(1H 00) 0~99 00
(Alarm 1 Time Delay) 0~60 1
(Alarm 1 Relay) ON, OFF ON
(Alarm 1 Blink) ON, OFF OFF
(Alarm-2) 1~Full range 40%/F.R.
(2H) H, L H
(2H 00) 0~99 00
(Alarm 2 Time Delay) 0~60 1
(Alarm 2 Relay) ON, OFF ON
(Alarm 2 Blink) ON, OFF OFF
(Alarm-3) 1~Full range 50%/F.R.
(3H) H, L H
(3H 00) 0~99 00
(Alarm 3 Time Delay) 0~60 1
(Alarm 3 Relay) ON, OFF ON
(Alarm 3 Blink) ON, OFF OFF
(End) - -
LEVEL1 LEVEL2 PARAMETER DEFAULT
(Maintenance-Level) 0 ~ Full range 0
(Under) ON / OFF OFF
(Engineering) ON / OFF OFF
(Emergency-Timeout) ON / OFF OFF
(End) - -
(Trouble Relay) ON / OFF OFF
(Alarm Relay) ON / OFF OFF
(mA out) ON / OFF OFF
or (0 or 100) 0 or 100 (Flickering) When ON, starts from 100
When OFF, starts from 0
(Channel number) 0~128 1
(Parity Bit) 0~2 1
[Table 4. Setting Table]
485 MODE
Test MODE
Option MODE
PROGRAM MODE
ALARM MODE
6. Operation Method6. Operation Method

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Instruction Manual
6.5.2. PROGRAM MODE
- When "FUNC" S/W is pressed, it enters Program Mode.
- When "RESET" S/W is pressed, it returns to gas concentration display mode.
- It is decimal position setting mode, which is the first function in program data setting mode.
- When "FUNC" S/W is pressed, it enters decimal setting mode.
- When "RESET" S/W is pressed, it enters Program Mode.
- Decimal point is used when it is necessary to change decimal point for measured range.
Decimal point position is set by pressing "UP" S/W or "DOWN" S/W where it changes as shown
on the left. (Default 100)
Ex)100, 10.0, 1.00, 0.100
-
When a desired decimal position is displayed, press "FUNC" S/W to set it and enter the next item.
- When "RESET" S/W is pressed, it enters Program Mode.
- It is High scale setting mode, which sets the max. gas concentration to be displayed.
- High scale value is set in accordance to the domestic regulations as factory setting.
- When "FUNC" S/W is pressed, it enters high scale setting mode.
- When "RESET" S/W is pressed, it enters Program Mode.
- High scale changes a set value according to measuring range. Scale value increases or
decreases upon pressing "UP" S/W or "DOWN" S/W, respectively. (Default 100)
- When a desired high scale is displayed, press "FUNC" S/W to set it and enter the next item.
- When "FUNC" S/W is pressed, it enters Program Mode.
-
This setting mode is configured with the same measuring range as gas detector when delivered.
Ex.) When range is set to 100.
For 4 mA/DC output ... 0 Display For 20 mA/DC output ... 100 Display
- SAD setting mode to correct measurement error occurring from the detector.
- When "FUNC" S/W is pressed, it enters SAD setting mode.
- When "RESET" S/W is pressed, it enters Program Mode.
- Function to set SAD value. SAD value increase or decreases when "UP" S/W or "DOWN" S/W is
pressed, respectively. For negative value, "-" sign displays above the first digit. (Default 0)
- When a desired SAD is displayed, press "FUNC" S/W to set it and enter the next item.
- When "FUNC" S/W is pressed, it enters Program Mode.
(Ex.) When output error at detector is -2, the actual display should be -2, but SAD set value of
2 is corrected and 0 is displayed.
- Passworkd setting function.
- When "FUNC" S/W is pressed, it enters PassWord setting mode.
- When "RESET" S/W is pressed, it enters Program Mode.
-
Password value increases or decreases when "UP" S/W or "DOWN" S/W is pressed, respectively.
(Default P00)
- When a desired password no. is displayed, press "FUNC" S/W to set it and enter the next item.
- When "RESET" S/W is pressed, it enters Program Mode.
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■ After setting a password, move to "UP" S/W or "DOWN" S/W then press "FUNC" S/W to enter the mode.
■ In Program setting function, when it passes 10 s after the last S/W control, it automatically returns to gas
concentration display mode.
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- A message indicating completion of setting is displayed as "End" for 2 sec then it returns to gas
concentration display status.
6.5.3. ALARM Mode
- It can designate value of Alarm1, Alarm2, and Alarm3.
- When "RESET" S/W is pressed, it enters Program Mode.
- When "RESET" S/W is pressed, it returns to gas concentration display mode.
- It is a mode that sets Alarm Latch Type.
- When "FUNC" S/W is pressed, it enters Alarm Latch Type setting mode.
- When "RESET" S/W is pressed, it enters Alarm Setting Mode.
- It is a mode to change alarm reset type and "ON" and "OFF" mode changes when "UP" or
"DOWN" S/W are pressed.
-
When a desired alarm latch type is displayed, press "FUNC" S/W to set it and enter the next item.
- When "RESET" S/W is pressed, it enters Program Mode.
- Alarm Latch Type has two modes; "ON" and "OFF". "OFF" mode automatically resets alarm.
When "ON", the user must press "RESET" S/W to release and reset the alarm.
- It is a function that sets Energizer Modes for Alarm Relay and Fault Relay.
- When "FUNC" S/W is pressed, it enters Energizer Mode setting function.
- When "RESET" S/W is pressed, it enters Alarm Setting Mode.
- ON/OFF of Energizer Mode is determined by "UP" S/W or "DOWN" S/W.
- When ON, it is in Normal Open (NO) status.
- When OFF, it is in Normal Close (NC) status.
-
When a desired energizer mode is displayed, press "FUNC" S/W to set it and enter the next item.
- When "RESET" S/W is pressed, it enters Alarm Setting Mode.
■ After setting a password, move to "UP" S/W or "DOWN" S/W then press "FUNC" S/W to enter the mode.
■
In Alarm setting function, when it passes 10 s after the last S/W control, it automatically returns to gas concentration
display mode.
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- Mode that sets external warning lights to operate with a desired alarm.
- When "FUNC" S/W is pressed, it enters Alarm Lamp setting mode.
- When "RESET" S/W is pressed, it enters Alarm Setting Mode.
- Select a desired Alarm using "UP" S/W and "DOWN" S/W then set using "FUNC" S/W.
- By default, it is set at "ON".
- When Alarm goes off when Alarm Lamp is ON, warning light is on. When it is OFF, warning
light is off.
- When a desired ALP value is displayed, press "FUNC" S/W to set it and enter the next item.
- When "RESET" S/W is pressed, it enters Alarm Setting Mode.
- Alarm 1 threshold setting function message is displayed as "AL-1"
- Press "FUNC" S/W to enter Alarm 1 threshold setting function.
- When "RESET" S/W is pressed, it enters Alarm Setting Mode.
- Function to change Alarm 1 threshold setting. Max. allowable is high scale value.
Pressing "UP" S/W or "DOWN" S/W increases or decreases Alarm1 value, respectively.
-
When a desired alarm 1 threshold is displayed, press "FUNC" S/W to set it and enter the next item.
- When "RESET" S/W is pressed, it enters Alarm Setting Mode.
- (Default: Alarm1 = 20(F/S 20%), Alarm2 = 40(F/S 40%), Alarm3 = 50(F/S 50%))
- Alarm level is set to the concentration outlined in domestic regulations as factory setting.
- It is a mode to set a direction of Alarm 1 operation. Pressing "UP" S/W or "DOWN" S/W displays
"1H" or "1L", respectively.
- "1H" mode operates when gas value is equal or greater than Alarm1 setting value.
"1L" mode operates when gas value is equal or less than Alarm1 set value.
- When a desired mode is displayed, press "FUNC" S/W to set it and enter the next item.
- When "RESET" S/W is pressed, it enters Alarm Setting Mode.
- It is a mode to set a dead band for Alarm 1 operation. Pressing "UP" S/W or "DOWN" S/W
increases or decrease the value, respectively. (Default 0)
- When Alarm 1 is in "H" mode, Alarm 1 operates at values above the sum of Alarm and dead
band values and releases below the sum.
- When Alarm 1 is in "L" mode, Alarm 1 operation below difference of Alarm and dead band
values and releases above the difference
- When a desired Alarm1 dead band value is displayed, press "FUNC" S/W to set it and enter the
next item.
- When "RESET" S/W is pressed, it enters Alarm Setting Mode.
- It is a mode to set Alarm1 dwell time.
- It is a function to prevent instantaneous malfunction of detector due to external shock and noise
other than from normal opeartion.
- Press "FUNC" S/W to enter Alarm 1 dwell time setting function.
- When "RESET" S/W is pressed, it enters Alarm Setting Mode.
- To change Alarm 1 dwell time, pressing "UP" S/W or "DOWN" S/W increases or decreases the
time in unit of seconds (Default 1)
Ex.) Alarm Threshold Value: 20%LEL/delay Time: When it is at 5 sec, Alarm triggers when
the measured value is above the set value based on 20%LEL for 5 sec or longer. When it goes
down below the set value within 5 sec, alarm is not triggered.
-
When a desired Alarm 1 dwell time is displayed, press "FUNC" S/W to set it and enter the next item.
- When "RESET" S/W is pressed, it enters Alarm Setting Mode.
- It is a mode to set Alarm1 contact output.
- Press "FUNC" S/W to enter Alarm 1 contact output setting function.
- When "RESET" S/W is pressed, it enters Alarm Setting Mode.
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Full Range
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- It is a mode to change Alarm1 contact output and "ON" and "OFF" mode changes when "UP"
S/W or "DOWN" S/W are pressed.
- Alarm1 contact output mode has two modes; "ON" and "OFF". In OFF mode, Alarm 1 contact
output does not run. In ON mode, it runs.
- When a desired Alarm 1 contact output mode is displayed, press "FUNC" S/W to set it and enter
the next item.
- When "RESET" S/W is pressed, it enters Alarm Setting Mode.
- Alarm 1 blink output setting function that sets Alarm1 contact output to go ON/OFF at 1 sec
interval during buzzer operation.
- Press "FUNC" S/W to enter Alarm 1 blink output setting function.
- When "RESET" S/W is pressed, it enters Alarm Setting Mode.
- It is a mode to change Alarm1 blink output and "ON" and "OFF" mode changes when "UP" S/W
S/W or "DOWN" S/W are pressed.
- Alarm1 blink output mode has two modes; "ON" and "OFF". In OFF mode, Alarm 1 blink output
does not run. In ON mode, it runs. (However, it runs when Alarm1 contact output mode is ON.)
- When a desired Alarm 1 blink output mode is displayed, press "FUNC" S/W to set it and enter
the next item.
- When "RESET" S/W is pressed, it enters Alarm Setting Mode.
- Alarm 2 and Alarm 3 has the same menu structure.
- A message indicating completion of setting is displayed as "End" for 2 sec then it returns to gas
concentration display status.
6.5.4. Option Mode (Option setting)
■ After setting a password, move to "UP" S/W or "DOWN" S/W then press "FUNC" S/W to enter the mode.
■
In Option setting mode, when it passes 10 sec. after the last S/W control, it automatically returns to gas
concentration
display mode.
■ In option mode, most settings are factory preset, therefore, this function should not be adjusted.
When it is unavoidable, the user must seek help from Gastron to adjust.
- It is a mode to set Option function.
- When "FUNC" S/W is pressed, it enters Option setting mode.
- When "RESET" S/W is pressed, it returns to gas concentration display mode.
- It is a mode to set FND display and output value when it is in Stand-by Mod
- Press "FUNC" S/W to enter n-L setting function.
- When "RESET" S/W is pressed, it enters Option Setting Mode.
- By pressing "UP" S/W and "DOWN" S/W, it can be set in full range.
- (Default: 0 Oxygen : 20.9(Ex., Setting 0 : 4mA, Full Range : 20mA))
- When a desired n-L value is displayed, press "FUNC" S/W to set it and enter the next item.
- When "RESET" S/W is pressed, it enters Option Setting Mode.
- I
tem to set whether to use a function that displays Undr on FND when a negative value is below -10%.
- When "FUNC" S/W is pressed, it enters Under setting mode.
- When "RESET" S/W is pressed, it enters Option Setting Mode.
- By pressing "UP" S/W or "DOWN" S/W, ON/OFF status can be set and when it is ON, UNDER
function is available for use.(Default OFF)
- When a desired item is displayed, press "FUNC" S/W to set it and enter the next item.
- When "RESET" S/W is pressed, it enters Option Setting Mode.
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Full Range
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- For measurement display, it displays raw data from -XXXX ~ +YYYY.
- When "FUNC" S/W is pressed, it enters "Under" setting mode.
- When "RESET" S/W is pressed, it enters Option Setting Mode.
- (This mode is only used as test mode and is not used in the actual field.)
-
By pressing "UP" S/W or "DOWN" S/W, ON/OFF status can be set and when it is ON, the function
is available for use. (Default OFF)
- When a desired item is displayed, press "FUNC" S/W to set it and enter the next item.
- When "RESET" S/W is pressed, it enters Option Setting Mode.
- It sets Emergency Time Out. In stand-by mode, the user can decide whether to set the time.
- When "FUNC" S/W is pressed, it enters Emergency Time Out setting mode.
- When "RESET" S/W is pressed, it enters Option Setting Mode.
- By pressing "UP" or "DOWN" S/W, ON/OFF status can be set. When it is ON, mode time runs for
30 min and when it is OFF, stand-by mode time continuously runs without limit. (Default OFF)
- When a desired item is displayed, press "FUNC" S/W to set it and enter the next item.
- When "RESET" S/W is pressed, it enters Option Setting Mode.
- A message indicating completion of setting is displayed as "End" for 2 sec then it returns to gas
concentration display status.
- Test mode enables testing without injecting gas to the detector sensor. The user can set an
arbitrary concentration by pressing "UP" or "DOWN" S/W and the alarm function operates
normally with a user-defined concentration.
- When "FUNC" S/W is pressed, it enters test setting mode.
- When "RESET" S/W is pressed, it returns to gas concentration display mode.
- It is a mode that sets ON/OFF status for Trouble Relay Test Operation.
- Press "FUNC" S/W to enter Trouble Relay setting function.
- When "RESET" S/W is pressed, it enters Test Setting Mode.
- By pressing "UP" S/W or "DOWN" S/W, ON/ OFF status can be set and when it is ON, Trouble
Relay function is available for use. (Default OFF)
- When a desired item is displayed, press "FUNC" S/W to set it and enter the next item.
- When "RESET" S/W is pressed, it enters Test Setting Mode.
- It is a mode that sets ON/OFF status for Alarm Relay Test Operation.
- Press "FUNC" S/W to enter Alarm Relay setting function.
- When "RESET" S/W is pressed, it enters Test Setting Mode.
- By pressing "UP" S/W or "DOWN" S/W, ON/OFF status can be set and when it is ON, Alarm
Relay function is available for use. (Default OFF)
- When a desired item is displayed, press "FUNC" S/W to set it and enter the next item.
- When "RESET" S/W is pressed, it enters Test Setting Mode.
6.5.5. Test Mode
■ After setting a password, move to "UP" S/W or "DOWN" S/W then press "FUNC" S/W to enter the mode.
■
In test mode, when it passes 10 s after the last S/W control, it automatically returns to gas concentration display mode.
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- It is mA Output Signal Test Mode.
- Press "FUNC" S/W to enter mA Output setting function.
- When "RESET" S/W is pressed, it enters Test Setting Mode.
- By pressing "UP" S/W or "DOWN" S/W, ON/OFF status can be set and when it is ON, mA out
function is available for use. (Default OFF)
- When a desired item is displayed, press "FUNC" S/W to set it and enter the next item.
- When "RESET" S/W is pressed, it enters Test Setting Mode.
- When Aout is OFF, it starts from 0. FND value is changed by "UP" S/W or "DOWN" S/W but mA
is not outputted. (Default 3mA)
- When Aout is ON, FND value outputs from 100 and output current is 20 mA. It can be changed
by "UP" S/W or "DOWN" S/W.
- (FND: 0~100, mA : 4mA~20mA)
- When "FUNC" S/W is pressed, it returns to Test Mode Setting Mode.
- When "RESET" S/W is pressed, it returns to Test Mode Setting Mode.
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Full Range
- It is a mode that sets 485 function.
- When "FUNC" S/W is pressed, it enters 485 setting mode.
- When "RESET" S/W is pressed, it returns to gas concentration display mode.
- It is channel Number Setting Function that sets Serial Number of Control Unit.
- Press "FUNC" S/W to enter Channel number setting function.
- When "RESET" S/W is pressed, it returns to 485 Mode.
- Channel number is a mode that enters serial number of control unit to enable recognition of
operation status of each control unit at other equipment, such as PC, etc. Pressing "UP" S/W
or "DOWN" S/W increase or decreases Address No. Value, respectively. (Default 1)
- When a desired address no. is displayed, press "FUNC" S/W to set it and enter the next item.
-
Channel No is set to "1" as factory preset and is only entered when network function is to be used.
When two or more control unit is used, Channel No. shall not overlap.
- Mode that sets Parity Bit, which is a format of 485 communication.
- Press "FUNC" S/W to enter Parity Bit setting function.
- When "RESET" S/W is pressed, it returns to 485 Mode.
- Parity Bit is an additional bit to the original data to inspect error during transmission of data.
Pressing "UP" S/W or "DOWN" S/W increases or decreases Parity Bit value, respectively.
(Default 1)
- 0 : NONE, 1: EVEN, 2 : ODD
- When a desired Parity Bit is displayed, press "FUNC" S/W to set it and enter the next item.
6.5.6. 485 Setting Mode
■ After setting a password, move to "UP" S/W or "DOWN" S/W then press "FUNC" S/W to enter the mode.
■
In 485 mode, when it passes 10 sec. after the last S/W control, it automatically returns to gas concentration display mode.
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6.5.7. Maintenance Mode
■ Pressing both "RESET" and "TEST" S/W for 2 sec or longer in gas concentration display mode enters
Maintenance mode.
■ "RESET" S/W must be pressed in Maintenance mode to return to gas concentration display mode.
- Mode that selects function to set current input and output values that are reference of Channel unit.
Pressing "UP" S/W or "DOWN" S/W displays "In" or "oUt", respectively.
- When a desired mode is displayed, press "FUNC" S/W to set it and enter the mode.
- When "In" is selected, mode sets current input. When "oUt" is selected, mode sets current
output.
- When "RESET" S/W is pressed, it returns to gas concentration display mode
- It is when "In" is selected and a mode that sets by inputting 4 mA current.
- Press "FUNC" S/W to enter function that displays current input by number.
- When "RESET" S/W is pressed, it returns to gas concentration display mode.
- It is a mode that displays value converted from processor after inputting 4mA current to (mA)
terminal.
- Press "FUNC" S/W when the displayed number is stable to display SUC (Success) for a current
input within normal range and move to the next item.
- C-F (Calibration-Fail) displays when a current out of range is inputted. After confirming input
current after re-display of current value then press "FUNC" S/W again to confirm.
- When "RESET" S/W is pressed, it returns to gas concentration display mode.
- Mode that sets by inputting 20 mA current.
- Press "FUNC" S/W to enter function that displays current input by number.
- When "RESET" S/W is pressed, it returns to gas concentration display mode.
▼
OR
- It is a mode that displays value converted from processor after inputting 20mA current to (mA)
terminal.
- Press "FUNC" S/W when the displayed number is stable to display SUC (Success) for a current
input within normal range and move to the next item.
- C-F (Calibration-Fail) displays when a current out of range is inputted. After confirming input
current after re-display of current value then press "FUNC" S/W again to confirm.
- When "RESET" S/W is pressed, it returns to gas concentration display mode.
- When "oUt" si selected, it is a mode after input current, which sets 4 mA output current.
(Default 4.00)
- Connect ammeter to 4~20 mA output terminal and press "UP" S/W or "DOWN" S/W to match the
values on ammeter and FND then press "FUNC" S/W to set output current and move to the next
item.
- When "RESET" S/W is pressed, it returns to gas concentration display mode
- Mode that sets 20 mA output current. (Default 20.00)
- Value lights on in 1 sec interval on FND.
- Connect ammeter to 4~20 mA output terminal and press "UP" S/W or "DOWN" S/W to match the
values on ammeter and FND then press "FUNC" S/W to set output current and move to the next
item.
- When "RESET" S/W is pressed, it returns to gas concentration display mode
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OR
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- It is a mode that tests output current after calibration. (Default 4.0)
- It can confirm a range for 3.0 mA - 21.0 mA with "UP" S/W and "DOWN" S/W.
- Pressing "FUNC" S/W after confirmation goes to the next item.
- When "RESET" S/W is pressed, it returns to gas concentration display mode.
- A message indicating completion of setting is displayed as "End" for 2 sec then it returns to gas
concentration display status.
▼ ▲
6.5.8. Factory Initialization Mode
■ By pressing "FUNC" S/W + "UP" S/W + "DOWN" S/W and turning ON power, it enters the mode.
■ Factory initial is a mode that resets the data to the originafla ctory setting.
■ In factory initialization mode, most settings are factory preset, therefore, this function should not be adjusted.
When it is unavoidable, the user must seek help from Gastron to adjust.
- It is a mode that resets the current saved data to the original factory setting.
- When "RESET" S/W is pressed, it returns to gas concentration display mode.
- Press "FUNC" S/W tp enter.
- By pressing "UP" S/W or "DOWN" S/W, Yes/no status can be set. When it is "Yes", Factory
Initialization function can be used. (Default "no)
- When "RESET" S/W is pressed, it returns to gas concentration display mode.
- It is a function that uses "FUNC" S/W, therefore, there are cases where S/W is pressed
repeatedly.
- To prevent this, when "FUNC" S/W is used for Yes/no, FND displays "1" -> "11" -> "111" ->
"1111" from the left in 0.5 sec interval.
- When "YES" is selected, initialization is complete and it returns to gas concentration display
mode.
- When "no" is selected, it returns to gas concentration display mode without initialization.
- Selecting "RESET" S/W returns to gas concentration display mode without FND display.
▼
- It is a mode that resets only calibration data from the currently saved data to the original factory
setting.
- When "RESET" S/W is pressed, it returns to gas concentration display mode.
- Press "FUNC" S/W tp enter.
- By pressing "UP" S/W or "DOWN" S/W, Yes/no status can be set. When it is "Yes", Calibration
Initialization function can be used. (Default "no)
- When "RESET" S/W is pressed, it returns to gas concentration display mode.
- It is a function that uses "FUNC" S/W, therefore, there are cases where S/W is pressed
repeatedly.
- To prevent this, when "FUNC" S/W is used for Yes/no, FND displays "1" -> "11" -> "111" ->
"1111" from the left in 0.5 sec interval.
- When "YES" is selected, initialization is complete and it returns to gas concentration display
mode.
- When "no" is selected, it returns to gas concentration display mode without initialization.
- Selecting "RESET" S/W returns to gas concentration display mode without FND display.
6.5.9. Calibration Data Initialization Mode
■ By pressing "FUNC" S/W + "DOWN" S/W and turning ON power, it enters the mode.
Calibration Initialization only resets calibration value to factory setting.
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7.1. MODBUS RS485
7.1.1. Interface setting
7.1.2. MODBUS RS485 Register map
■ Data Format: RTU
■ Baud rate: 9600 bps
■ Data bits: 8bits
■ Stop bit: 1bits
■ Parity: Even
■ For details, please go to www. modbus.org
[Figure 7. GTC-520F Drawing]
8. Outline Drawing and Dimensions7. Interface Conguration
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
[Table 5. RS485 MODBUS Address Configuration]

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9.1. 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.
9.2. 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.
9.3. 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 is in a range of -20 °C ~ 50 °C.
■ Installation Height: 1,000 M below sea level
■ Relative Humidity: 5% ~ 99%
■ Installation Site: Indoor and Outdoor
■ Explosion Ignition Grade for the Gas or Vapor: Ex d IIC T6
■
During wiring work, use explosion-proof cable gland at cable inlet or tightly seal cable conduit during metal cable
wiring construction to prevent spread of flames in case of explosion or movement of gas, etc. through the cable
conduit within 50 mm. All materials including materials used for sealing of unused inlets must have safety
certificates!
■ When connecting the equipment with cable, screw thread must be tightened 5 threads or more.
■ Work in conditions satisfying other [Standards for Selection, Installation, and Maintenance, etc. of Explosion-
proof Electric Machine and Equipment Wiring, etc. at Work Site]
■ All materials used for cable inlet such as cable gland and sealing fitting, etc. and used as sealing unused inlets
must pass the verification!
9. Precautions before Installation9. Precautions before Installation
[Figure 21. High-Pressure Packing Type] [Figure 22. 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