GASTRON GTC-520A User manual

GTC-520A
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]
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Read in detail for correct use.

We sincerely thank you for purchasing the product of Gastron Co. Ltd.
Our Gastron Co.Ltd. is a company specialized in Gas detector and Gas Monitoring System, being recognized
by many consumers due to the best quality and use convenience. We always enable you consumers to find
desired products nearby and are ceaselessly studying and striving for development of Gas detectors satisfying
customers. From now on, solve all anguishes concerning Gas detector with the products of Gastron Co. Ltd,
We Gastron Co. will take a responsibility and give you satisfaction.
In the present instruction manual, operation method for Gas detector as well as simple methods for
maintenance and repair, etc. are recorded If you read it in detail and keep it well, for reference when you
have questions, then it will give you much help.
* KOSHA GUIDE : P-135-2013
Calibration should be executed at periods required by the manufacturer, and should be executed in every quarter
unless there are separate calibration periods.
Gas & Flame
Detection System
GTC-520A
Instruction Manual
www.gastron.com
02_03
When abnormalities occur after purchasing the product,
please contact the following address.
· Address : 23 Gunpo Advanced Industry 1-ro,
Gunpo-si, Gyeonggi-do
· Tel : [phone]
· Fax : [phone]
· URL : www.gastron.com
· e-mail : [email protected]
The present product and the product manual can be changed without advance notice for performance improvement
and use convenience of the product.
■ForaccurateoperationofGasdetector,checkupandcalibrateformorethanonceinevery6months.
( * See No. 13 of KOSHA GUIDE : P-135-2013 / 8.3 paragraph on qualification and calibration)
■ForaccurateoperationofGasdetector,checkupandcalibrationwithcalibrationgasbefore
measurement is recommended.
■Whennotcalibrated,itmaycausemalfunctionoftheequipmentduetoproblemsresultingfrom
Sensor aging.
■Whenthepresentinstrumentshouldbedismantled,thosewithprofessionalskillsforGasdetector
should conduct the operation.
■Forpowersupplycable,wirespecificationsshouldbedeterminedbyreferringtotheitemof"Length
 ofinstalledcable".
■ForthecontentsoncheckupandcalibrationofGasdetector,pleaseuseourcompany'sengineering
department , e-mail, or web site.
Greetings

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04_05
ContentsContents
GTC-520A
Instruction Manual
  6.5.8. Factoryinitializationfunction(FactoryInitial) ····················································································· 35
  6.5.9. Initializationfunctionforcalibrationdata(CalibrationInitial) ···························································· 36
7. Interface configuration·············································································································································· 37
7.1. MODBUS RS485····················································································································································· 37
7.1.1. Interface setting ······································································································································ 37
7.1.2. MODBUS RS485 Register map··············································································································· 37
8. Outline drawing and Dimensions···························································································································· 38
9. Revision record···························································································································································· 39
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. Configuration of power supply ························································································································· 12
5.2. Configuration of signal terminal ······················································································································· 13
5.3. Configuration of Relay terminal ························································································································ 14
5.4. How to connect 3 wire type Gas detector········································································································ 15
5.5. How to connect 2 wire type Gas detector········································································································ 15
6. How to operate··························································································································································· 16
 6.1. PowerON··························································································································································· 16
 6.2. GasMeasuringMode········································································································································ 16
 6.3. TestMode ·························································································································································· 17
 6.4. Checkupmode(Stand-byMode)······················································································································ 17
 6.5. Operation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················································································································································ 30
  6.5.6.485settingmode··································································································································· 32
  6.5.7.Maintenancemode································································································································· 33

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06_07
3. Specications
GTC-520A receiver is a receiver unit having adopted high-performance A/D converter and Micro-process with diversified
functions embedded. GTC- 520A receiver unit is a stand-alone type receiver connected to one detection unit, protected
by the Case using ABS material and displays concentrations using FND digital display and 3 Color bar graphic LED.
It has alarm functions of 1st alarm, 2nd alarm, 3rd alarm as well as breakdown alarm function.
GTC-520A stand-alone type receiver unit displays with audio signal (Buzzer) and audio signal (Alarm LED) and
has functions of holding the maximum measured value upon occurrence of alarm. GTC-520A receiver unit allows
remote control for alarm clearing, and has output (SPDT contact) for the alarm so that it can perform the function of
interlocking control. GTC-520A receiver unit provides output of 4-20mA.DC for the measured values, and allows digital
communication by using RS-485 communication signals(Optional).
3.1. Basic Specifications
ITEMS SPECIFICATION
Measuring Value Display 4-Digit FND (32 segment)
Measuring Range 000.0 ~ 9999 display possible
Alarm Indicator Visual display: 3-Alarm, Trouble LED, warning light
Audio display: Buzzer signal (85dB)
Alarm output Signal 3-stage Alarm, Trouble Rleay
Reset signal RESET switch and remote Reset control
Input signal 4~20mA DC
Output signal Isolated RS-485 Modbus(Option)
Approvals Classification CE
Basic Interface Analog 4-20mA current interface
Option MODBUS RS485 Board
Warranty Body(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. Features
GTC-520A
Instruction Manual 1. Overview

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08_09
4. Name and description of each part
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
[Figure 1. GTC-520 components]
GTC-520A
Instruction Manual 3. Specications

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10_11
No ITEMS SPECIFICATION
1Case body Made of ABS material to mount Display and protect the circuit from surrounding environment,
outside impacts.
2Case cover Made of ABS material to mount Main PCB and protect the circuit from surrounding environment,
outside impacts.
3Cover고정button Device to mount cover onto Case body. Cover is opened by pushing the button and pulling the
cover forward.
4Mount hole HoletomountControlunitontoouterwallorotherMountplate(2-Ø6)
5Conduit connection 2 EA of ø22 holes are configured on upper and lower sides, respectively. Connect power cable,
signal Cable, etc. by using cable lead-in port according to field conditions
6Concentration display
(FND Digital display)
Consecutively display measured values of the detector connected to each Channel.
Display user-designated value in blinking state upon performing Test function.
7Power supply LED Power LED is lighted when power is inputted.
8Checkup LED STD-BY LED blinks in the mode for detector checkup
9Breakdown LED Trouble LED is lighted upon occurrence of trouble in receiver unit and detection unit.
Ex) * Upon occurrence of defective wire connection to detector and of abnormality
10 Alarm3 LED Alarm 3 LED is lighted upon occurrence of 3rd alarm.
Alarm 3 LED is lighted when 3rd alarm is reached upon execution of test function.
11 Alarm2 LED Alarm 2 LED is lighted upon occurrence of 2nd alarm.
Alarm 2 LED is lighted when 2ndalarm is reached upon execution of test function.
12 Alarm1 LED Alarm 1 LED is lighted upon occurrence of 1st alarm.
Alarm 1LED is lighted when 1st alarm is reached upon execution of test function.
13 3-color bar graph LED
3 Color bar graphic LED consecutively displays measured values and alarm setting values together
with FND display.
Bar graphic LED is lighted in green when the measured value is less than 1st Alarm, in orange
when it is more than 1st Alarm but less than 2nd Alarm, and in red when it is more than 2nd
Alarm.
When the measured value is more than the alarm setting value, Bar graphic is held at the
maximum value, and Bar graphic is displayed in blinking state for the alarm.
14 Test S/W
When test Switch is pushed, the mode performing self diagnosis function is entered into.
It is a S/W where the measured value FND blinks and Alarm operation state can be checked by
adjusting the measured value using the test Switch.
Self diagnosis is cleared by pushing buzzer stop switch and return switch.
15 Return S/W It performs functions such as clearing of Alarm, clearing of Self test, clearing of Program setting,
etc.
16 Buzzer stop S/W Used for buzzer stop upon occurrence of Alarm.
17 Function S/W FUNC Switch is a key that converts and select functions such as setting of alarm value, alarm
method, Dead band of alarm, delay operation, etc. of alarm to input data values.
18 UP S/W
Used upon increasing the setting values or selecting the next setting values after selection of each
mode using the function switch.
If UP switch is pushed for a given time in the mode requiring frequent changes of setting values,
the setting values are changed fast.
No ITEMS SPECIFICATION
19 DOWN S/W
Used upon decreasing the setting values or selecting the next setting values after selection of
each mode using the function switch.
If DOWN switch is pushed for a given time in the mode requiring frequent changes of setting
values, the setting values are changed fast.
20 Buzzer Operates with continuous sound when test function is performed upon occurrence of alarm and
breakdown alarm.
21 SignalI/Oterminal(CN6) Used for supply of power to gas leakage detector, outputting of 4~20mA current, connection of
cables for S-485 MODUS communication, etc.
22 Signal output terminal (CN7) Used for outputting of Relay Dry Contact Signals such as alarm, breakdown, etc. outputting of
DC warning light Signal s, connection of cable, etc.
23 RS-485 module(Option)
RS-485 communication Module can transmit and receive current concentrations and setting
values, etc. by being connected to PC and other outside communication equipment as an
Isolation type.
24 Power supply input
Terminal (CN9) Terminal to connect power supply cable for operation of the present control unit.
25 Power supply ON/OFF
switch
Switch used for turning ON,OFF of power supply for Control unit . When wire connection
operation for cable, etc. is performed, make sure to operate after turning OFF the power supply.
26
Power supply Terminal for
outside warning light
(CN10)
Assistance power supply Terminal to install outside warning light when the present Control unit is
operating.
[Table 1. Description on configuration of GTC-520A]
GTC-520A
Instruction Manual 4. Name and description of each part4. Name and description of each part

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5. Installation5. Installation
GTC-520A
Instruction Manual
5.2. Configuration of signal terminal
■Installationinthefieldoropeningoroperationofthecoverfortheinstalledgasleakagedetectorandreceivingpanel
should never be allowed to be performed those other than approved users or the person of the headquarters
in charge of installation and repair. Otherwise, serious damages can be inflicted to life and property such as fire
or explosion accidents. Also make sure to shut off the power supply and conduct operation after checking whether
explosive gas remains or flammable substances exist in the surroundings.
■Connect4-20mAoutputandExternalReset,RS485,outsidegasdetectorbyusingCN6terminal.
Terminal configuration is as shown in the following table.
■UsetheRS-485dedicatedcableforRS-485Cable,anduseShieldcableofCVVSormorethanCVVSB0.75sq
for connecting cable between 4~20mA Output and Detector!
5.1. Configuration of power supply
■WhenDC24Vistobeused,aseparaterequestshouldbemadeuponproductordering.Whenreleasedas
DC24V Type per user request, connect (+) of DC24V (+) toL1 of CN9, and (-) to L2 for use.
■WhentheproductCoverisseparated,theterminalboxconnectingpowersupplywithinPCBandvarioussignals
appear.
■ConnectACpowersupply(85~260V50/60Hz)toCN9asshowninthefollowingfigure.
[Figure 2. Configuration of GTC-520A power supply]
[Table2.DescriptionofCN6terminal]
Note1) When RS485 Option is not available, RS485 function does not operate.
FUNCTION
OUTSIDE TERMINAL NAME DESCRIPTION
4-20mA
Output
VISO Outside power supply input terminal for 4-20mA Sink Driver
mA Output terminal for 4-20mA Source Driver
SENSOR
Flammability sensor Toxicity sensor O2 sensor (galvanic type)
1Red Cable Blue Cable N.C
2White Cable Red Cable Red Cable
RESET +arm reset function is performed when outside reset switch + terminal and + terminal
are short - circuited with - terminal.
-- terminal of outside reset switch
RS485 ARS485 A terminal ( TRXD + or P)
BRS485 B terminal ( TRXD + or N)

5.3. Configuration of Relay terminal
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5. Installation5. Installation
GTC-520A
Instruction Manual
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 +Outside power supply (DC24V) + output
14 -Outside power supply (DC24V) - output
[Table 3.Description of CN5 terminal]
[Figure 4. Configuration of CN5 terminal]
5.4. How to connect 3-wire type Gas detector
5.5. How to connect 2-wire type Gas detector
[Figure 5. 3-wire type gas detector]
[Figure6.2-wiretypegasdetector]
■Whenthegasdetectorisconfiguredwith4-20mAoutput,connect
with the Channel Unit by the method shown on the right side.
■Connectingcableshouldbeconfiguredwithshieldcableof
CVVS or more than CVVSB 0.7sq.
■Ourcompany'sdetectormodelsoftherelevantmethodinclude
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, and GIR-3000 Series.
■Whenoutputofgasdetectorisconfiguredwith2-wire(V+,V-),
connect with the Channel Unit by the following method.
■Connectingcableshouldbeconfiguredwithshieldcableof
CVVS or more than CVVSB 0.7sq.
■Ourcompany'sdetectormodelsoftherelevantmethodinclude
TS-1100Tx, TS-2000Tx, TS- 3000 Series, and TS-3100 Series.
■ByusingCN5terminal,itisconfiguredwith3eaofSPDT-typeAlarmrelay,and1eaofSPDT-typeTroublerelay.
■AlarmLamp(LP)canbeconnectedwithDCoutsidewarninglight.
■TouseoutsideDCwarninglightoroutsidedevice,LPterminaloutputsDC+24Vpowersupplyirrespectiveof
AC, DC power supply mode.

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Instruction Manual
■ Check wire connections for operation power supply, with detection unit, between alarm unit and concentration display unit, etc.
■TurnthepowersupplyswitchONaftercheckinginputpowersupply
■ChecklightingofPowerLEDforalarmunitandconcentrationdisplayunit.
■Checkdisplayof"SELF"inFNDofconcentrationdisplayunit.
■When"Test"S/Wispushedformorethan2secinthedisplaystateofgasconcentration,Testmodeisenteredinto.
■When30minpassesafterthelastS/WoperationinTestmode,thedisplaystateofgasconcentrationis
automatically returned to.
6.1. Power ON 6.3. Test Mode
- Upon entering in Test mode, the figure for gas concentration display is displayed by blinking.
- This function allows testing in Channel Unit without gas injection in the detector sensor.
- Whentheusercansetanarbitraryvalueforgasconcentrationbypushing"Test"S/W,while
- Alarm Function is normally operated with the concentration value designated by the user.
-When"FUNC"S/Wispushedformorethan2sec,FND/LED/BarLEDTestfunctionisenteredinto.
- 3 Color bar graph LED alternatingly displays green, orange and red at an interval of 0.5sec,
- each function LED blinks at an interval of 0.5 sec.
-When"RESET"S/Wispushed,thedisplaystateofgasconcentrationisreturnedto.
▼▲
Full Range
■When"DOWN(Stand-by)"S/Wispushedformorethan2secinthedisplaystateofgasconcentration,thecheckup
mode is entered into.
■WhenETO(EmergencyTimeOut)wassetforONinOptionSettingModeandsominpasses,thedisplaystateof
gas concentration is automatically returned to.
■UponETOOFF,thedisplaystateofgasconcentrationisreturnedtoonlywhen"DOWN(Stand-by)"S/Wispushed
for more than 2 sec.
6.4. Checkup mode (Stand-by Mode)
- Function where STD-BY LED blinks, contact output f Trouble/Alarm relay for GTC-520A does
- not operate with all other functions operating in the checkup mode.
-When"DOWN(Stand-by)"S/Wispushedformorethan2sec,thedisplaystateofgas
- concentration is returned to.
- When the power supply for GTC-520A is turned ON, the current Firm Ware Version is displayed.
- Figures are displayed after VER is displayed in FND for 0.5 sec.
- Current Version is 2.09.
-"SELF"blinksforabout30secinFNDofconcentrationdisplayunit,anditimmediatelybecomes
- measuring state when Warming-up is finished.
- If abnormality occurs in the equipment or the detection unit at this time, breakdown alarm occurs.
■ IfthereisnoabnormalityinSELFTESTafterPowerOn,thefollowingstateofgasmeasurementisautomaticallyenteredinto.
6.2. Measuring Mode
- Gas concentrations received from the detector are displayed in FND digital display as figures.
- Gas concentration is displayed by 3 Color bar graphic LED and FND, in green when the
- concentration is less than the 1st Alarm, in orange when it is more than the 1st Alarm but less
- than the 2nd Alarm, and in red when it is more than the 2nd Alarm.
- When the detector is not connected or the current value inputted from the detector is inputted
- asacurrentvaluebelowthesetHighscalevalueby10%,thetextof"Undr"isdisplayedby
- blinking at an interval of 1 sec.
- Trouble LED is lighted, warning light blinks, and Buzzer sounds.
-When"BZSTOP"S/Wispushed,warninglightisturnedonandBuzzerstops.
- When the current value inputted from the detector is inputted as a current value more than the
- setHighscalevalueby10%,thetextof"oUEr"isdisplayedbyblinkingatanintervalof1sec.
-Alarm1,2,3LED'sarelighted,warninglightblinks,andBuzzersounds.
- Circular LED on the topmost among 3 Color bar graphic LED is lighted in red.
- When the gas concentration value is recognized as being higher than the Alarm setting value,
- the relevant Alarm function counts Alarm maintenance time and the Alarm function is operated
- if it is more than the Alarm maintenance time.
- Alarm relay is turned ON when it becomes more than the Alarm maintenance time.
-WhenAlarmLatchTypeisin"ON"modeandAlarmfunctionisoperated,Alarmstateandgas
- concentration value are maintained at the maximum value, Even when the gas concentration
- isloweredbelowtheAlarmvalue,itisnotclearedandmustbeclearedby"RESET"S/W.
-WhenAlarmLatchTypeisin"OFF"mode,Alarmfunctionisautomaticallycleareddepending
- on the gas concentrations.
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Instruction Manual
6.5. Setting for operation
6.5.1. Setting Table
LEVEL1 LEVEL2 PARAMETER DEFAULT
(Gas Funtion) TY1, Ty2, TY3, TY4 TY1
(Decimal-Point) 100, 1.00, 10.0, 0.100 100
(High-Scale) 10~9999 100
-99 ~ 99 0
(Pass Word) 0~99 00
(Out-Set) ON, OFF OFF
(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
(Zero-Skip) 0 ~ 20.0% 0
(Span-Skip) 0 ~ 20.0% 0
(Emergency-Timeout) ON / OFF OFF
(Outout Delay Time) 0~60 0
(Outout Delay Value) 0 ~ 20 0
(End) - -
(Trouble Relay) ON / OFF OFF
(Alarm Relay) ON / OFF OFF
(mA out) ON / OFF OFF
or (0 or 100) 0 or 100 (Blinking) 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
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GTC-520A
Instruction Manual
6.5.2. PROGRAM MODE
-When"FUNC"S/Wispushed,ProgramModeisenteredinto.
-When"RESET"S/Wispushed,thedisplaystateofgasconcentrationisenteredinto.
- The first function in setting functions for program data is setting for the position of decimal point.
-When"FUNC"S/Wispushed,thesettingfunctionfordecimalpointisenteredinto.
-When"RESET"S/Wispushed,ProgramModeisreturnedto.
- When it is necessary to change the decimal point according to the measurement range.
- Whensettingthedecimalpointposition,use"UP"S/WorEachtime"DOWN"S/Wispushed,
- the decimal point position is changed as shown on the left. (Basic value 100)
- Ex)100, 10.0, 1.00, 0.100
-Press"FUNC"S/Wwhenthedesireddecimalpositionisdisplayed,tosetthedecimalposition
- and enter the next item.
-PressRESET"S/WtoreturntoProgramMode.
- Setting function for High scale as a function for setting of the maximum value in gas
- concentration display.
- High Scale value is set for the range specified by domestic regulations upon product shipment.
-When"FUNC"S/Wispushed,thesettingfunctionforHighscaleisenteredinto
-When"RESET"S/Wispushed,ProgramModeisreturnedto.
- High scale value is the function where the setting values are changed according to measuring
- range,andthescalevalueisincreasedordecreasedwheneverUP"S/Wor"DOWN"S/Wis
- pushed (Basic value100)
-If"FUNC"S/WispushedwhenthedesiredHighscalevalueisdisplayed,theHighscalevalue
- is set and the next item is entered into.
-When"RESET"S/Wispushed,ProgramModeisreturnedto.
- The present setting mode is set for the same measuring range as gas detector upon factory
- shipment.
- Ex) When Range was set for 100,
- Upon outputting of 4 mA/DC….. 0 Display
- Upon outputting of 20 mA/DC….. 100 Display
- Setting function for SAD value as a function to compensate errors for measured values
- occurring in detection unit.
-When"FUNC"S/Wispushed,thesettingfunctionforSADvalueisenteredinto.
-When"RESET"S/Wispushed,ProgramModeisreturnedto.
-FunctionforsettingofSADvalue.SADvalueisincreasedordecreasedwhenever"UP"S/Wor
- "DOWN"S/Wispushed,and"-"signisaddedabovethefirstfigurefordisplaywhenitis
- a negative value. (Basic value 0)
-If"FUNC"S/WispushedwhenthedesiredSADvalueisdisplayed,theSADvalueisset,and
- the next item is entered into.
-When"RESET"S/Wispushed,ProgramModeisreturnedto.
- (Ex) When the error of output in detector is -2, Display shows 0 by calibration of SAD setting
- value 2 although the actual Display should indicate -2.
- Setting function for Password.
-When"FUNC"S/Wispushed,thesettingfunctionforPasswordisenteredinto.
-When"RESET"S/Wispushed,ProgramModeisreturnedto.
-ThevalueofPasswordisincreasedordecreasedwhenever"UP"S/Wor"DOWN"S/Wis
- pushed. (Basic value P00)
-If"FUNC"S/WispushedwhenthedesiredPasswordNo.isdisplayed,thePasswordNovalue
- is set and the next item is entered into.
-When"RESET"S/Wispushed,ProgramModeisreturnedto.
▼▲
▼▲
▼▲
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GTC-520A
Instruction Manual
- Used when No.1 receiver unit receives mA value outputted from 1 unit of detector and No.2
- receiver unit receives mA value outputted from the No.1 receiver unit.
- Function used to output the current gas value rather than 3mA when the No.1 receiver unit
- enters in Password Mode.
-When"FUNC"S/Wispushed,thesettingfunctionforSADvalueisenteredinto.
-When"RESET"S/Wispushed,ProgramModeisreturnedto.
-ModetochangetheOutSetmode."ON"and"OFF"modesarechangedwhenever."UP"S/Wor
- "DOWN"S/Wispushed.
-Whenitis"ON",actualGasvaluemAisoutputtedwhichevermodeofthereceiverunitis
- entered into.
-Whenitis"OFF",themAaccordingtoeachModeisoutputtedinthesamewayastheexistingone.
-If"FUNC"S/WispushedwhenthedesiredOutSetModeisdisplayed,theOutSetModeisset
- and the next item is entered into.
-When"RESET"S/Wispushed,ProgramModeisreturnedto.
-Themessageinformingcompletionofthesettingfunctionisdisplayedas"End"for2secand
- the display state of gas concentration is returned to.
6.5.3. ALARM Mode
- Values of Alarm1, Alarm2, Alarm3 can be designated.
-When"FUNC"S/Wispushed,Alarmsettingfunctionisenteredinto.
-When"RESET"S/Wispushed,thedisplaystateofgasconcentrationisenteredinto.
- Function for setting of Alarm Latch Type.
-When"FUNC"S/Wispushed,thesettingfunctionforAlarmLatchTypeisenteredinto.
-When"RESET"S/Wispushed,AlarmSettingModeisreturnedto.
-ModeforchangeofAlarmresettype."ON"and"OFF"modesarechangedwhenever"UP"S/W
- or"DOWN"S/Wispushed.
-If"FUNC"S/WispushedwhenthedesiredAlarmLatchTypeisdisplayed,theAlarmLatch
- Type is set and the next item is entered into.
-When"RESET"S/Wispushed,AlarmSettingModeisreturnedto.
-AlarmLatchTypehas2modesof"ON"and"OFF",whereAlarmisautomaticallyResetinOFF
- mode, while Alarm is Reset in ON mode only when the user clears by surely pushing the
- "RESET"S/W.
- Function to set Energizer Mode for Alarm Relay and Fault Relay.
-When"FUNC"S/Wispushed,thesettingfunctionforEnergizerModeisenteredinto.
-When"RESET"S/Wispushed,AlarmSettingModeisreturnedto.
-ON/OFFisdeterminedby"UP"S/Wor"DOWN"S/WinEnergizerMode.
- When it is ON, it is in Normal Open(NO) state.
- When it is OFF, it is in Normal Close(NC) state.
-If"FUNC"S/WispushedwhenthedesiredEnergizerModeisdisplayed,theEnergizerModeis
- set and the next item is entered into.
-When"RESET"S/Wispushed,AlarmSettingModeisreturnedto.
■ If"FUNC"S/Wispushedthroughmovingby"UP"S/Wor"DOWN"S/WaftersettingofPassword,itcanbeenteredinto.
■When10secpassesafterthelastS/WoperationinAlarmsettingfunction,thedisplaystateofgasconcentration
is automatically returned to.
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GTC-520A
Instruction Manual
- Mode setting for operation of outside warning light at the desired Alarm.
-When"FUNC"S/Wispushed,thesettingfunctionforAlarmLampisenteredinto.
-When"RESET"S/Wispushed,AlarmSettingModeisreturnedto.
-Setbypushing"UP"S/Wand"DOWN"S/Wandusing"FUNC"S/WinthedesiredAlarm.
-Basicvalueisdesignatedas"ON".
- If Alarm sounds when Alarm Lamp is turned ON , the warning light is in lighted state, while the
- warning light is in blinking state when the lamp is turned OFF.
-If"FUNC"S/WispushedwhenthedesiredALPvalueisdisplayed,theALPvalueissetandthe
- next item is entered into.
-When"RESET"S/Wispushed,AlarmSettingModeisreturnedto.
- The message for setting function of Alarm1 value as a function for setting Alarm 1 value is
- displayedas"AL-1".
-When"FUNC"valueisenteredinto.
-When"RESET"S/Wispushed,AlarmSettingModeisreturnedto.
- Function to change the setting value for Alarm 1. The maximum value is possible up to the
- HighScalevalue,andAlarm1valueisincreasedordecreasedwhenever"UP"S/Wor"DOWN"
- S/W is pushed.
-If"FUNC"S/WispushedwhenthedesiredAlarm1valueisdisplayed,theAlarm1valueisset
- and the next item is entered into.
-When"RESET"S/Wispushed,AlarmSettingModeisreturnedto.
- (Basic value : Alarm1 = 20(F/S 20%), Alarm2 = 40(F/S 40%), Alarm3 = 50(F/S 50%))
- Alarm level is set for the concentration specified in domestic regulations upon product shipment.
-ModeforsettingtheoperationdirectionofAlarm1,and"1H"or"1L"isdisplayedwhenever"UP"
- S/Wor"DOWN"S/Wispushed.
-"1H"modeoperateswhenGasvalueislargerthanorthesameasAlarm1settingvalue,while
- "1L"modeoperateswhenGasvalueissmallerthanorthesameasAlarm1settingvalue.
-If"FUNC"S/Wispushedwhenthedesiredmodeisdisplayed,themodeissetandthenextitem
- is entered into.
-When"RESET"S/Wispushed,AlarmSettingModeisreturnedto.
- Mode for setting of Dead band value with operation of Alarm1. The value is increased or
decreasedwhenever"UP"S/Wor"DOWN"S/Wispushed.(Basicvalue0)
- Function where Alarm1 operates at more than Alarm value plus Dead band value, while Alarm1
- isclearedatlessthanAlarmvalueminusDeadbandvaluewhenAlarm1isin"1H"mode.
- Function where Alarm1 operates at less than Alarm value minus Dead band value while Alarm1 is
- cleared at more than Alarm 1value plus Dead band value when Alarm1 is in “1L’ mode.
-If"FUNC"S/WispushedwhenthedesiredAlarm1deadbandvalueisdisplayed,thevalueis
- set and the next item is entered into.
-When"RESET"S/Wispushed,AlarmSettingModeisreturnedto.
- Function for setting of Alarm1 delay time.
- Function to prevent occurrence of instantaneous malfunction of the detector due to the effects
- of external impact and noise rather than normal operation.
-When"FUNC"S/Wispushed,thesettingfunctionforAlarm1delaytimeisenteredinto.
-When"RESET"S/Wispushed,AlarmSettingModeisreturnedto.
- For change in Alarm1 delay time, the Alarm1 delay time is increased or decreased by the unit
- ofsec"whenever"UP"S/Wor"DOWN"S/Wispushed.(Basicvalue1)
- Ex) When alarm setting value: 20%LEL/delay Time: 5sec, alarm occurs when the measured
- value of more than the alarm setting value based on 20%LEL exists for more than 5sec, while
- the alarm does not occur when it falls below the alarm setting value within 5 sec.
-If"FUNC"S/WispushedwhenthedesiredAlarm1delaytimeisdisplayed,theAlarm1delay
- time is set and the next item is entered into.
-When"RESET"S/Wispushed,AlarmSettingModeisreturnedto.
- Function for setting of Alarm1 contact output.
-When"FUNC"S/Wispushed,thesettingfunctionforAlarm1contactoutputisenteredinto.
-When"RESET"S/Wispushed,AlarmSettingModeisreturnedto.
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-ModeforchangeofAlarm1contactoutput."ON"and"OFF"modesarechangedwhenever"UP"
- S/Wor"DOWN"S/Wispushed.
-Alarm1contactoutputmodehas2typesof"ON"and"OFF"whereAlarm1contactoutputisnot
- operate in OFF mode, while it is operated in ON mode.
-If"FUNC"S/WispushedwhenthedesiredAlarm1contactoutputmodeisdisplayed,theAlarm1
- contact output mode is set and the next item is entered into.
-When"RESET"S/Wispushed,AlarmSettingModeisreturnedto.
- Setting function for Alarm1 blink output as a function for setting of Alarm1 contact output for
- ON/OFF function at the interval of 1 sec while Buzzer is operating.
-When"FUNC"S/Wispushed,thesettingfunctionforAlarm1blinkoutputisenteredinto.
-When"RESET"S/Wispushed,AlarmSettingModeisreturnedto.
-ModeforchangeofAlarm1blinkoutput."ON"and"OFF"modesarechangedwhenever"UP"S/W
- or"DOWN"S/Wispushed.
-Alarm1blinkoutputmodehas2typesof"ON"and"OFF"whereAlarm1blinkoutputisnotoperate
- in OFF mode, while Alarm1 blink output is operated in ON mode. (However, it is operated
- when Alarm1 contact output mode is ON.)
-If"FUNC"S/WispushedwhenthedesiredAlarm1blinkoutputmodeisdisplayed,theAlarm1
- blink output mode is set and the next item is entered into.
-When"RESET"S/Wispushed,AlarmSettingModeisreturnedto.
- Both the 2nd alarm (Alarm2) and the 3rd alarm (Alarm3) have the same menu structure.
-Themessageinformingcompletionofsettingfunctionisdisplayedas"End"for2sec,andthe
- display state of gas concentration is returned to.
6.5.4. Option setting
■When"FUNC"S/Wispushedfollowingmovingby"UP"S/Wor"DOWN"S/WaftersettingforPassword,itcanbe
entered into.
■When10secpassesafterthelastS/WoperationinOptionalsettingfunction,thedisplaystateofgas
concentration is automatically returned to.
■SinceOptionModeismostlyFACTORYsettingfunction,itshouldbeoperatedundersupportofGastronCo.Ltd.
when inevitable.
- Mode for setting of Optional function.
-When"FUNC"S/Wispushed,theoptionalsettingfunctionisenteredinto.
-When"RESET"S/Wispushed,thedisplaystateofgasconcentrationisreturnedto.
- Mode for display of FND and setting of outputted value in checkup mode.
-When"FUNC"S/Wispushed,thesettingfunctionforn-Lisenteredinto.
-When"RESET"S/Wispushed,OptionSettingModeisreturnedto.
-Byusing"UP"S/Wor"DOWN"S/W,settingispossiblewithintheFullRange.
- (Basic value : 0 Oxygen : 20.9(Ex, Setting value 0 : 4mA, Full Range : 20mA))
-If"FUNC"S/Wispushedwhenthedesiredn-Lvalueisdisplayed,theselectionissetandthe
next item is entered into.
-When"RESET"S/Wispushed,OptionSettingModeisreturnedto.
- Item for setting use status for marking function of Undr in FND in the case of less than -10%
among values less than 0.
-When"FUNC"S/Wispushed,thesettingfunctionforUnderisenteredinto.
-When"RESET"S/Wispushed,OptionSettingModeisreturnedto.
-ON/OFFstatecanbesetusing"UP"S/Wor"DOWN"S/W,andUNDERfunctioncanbeusedin
the case of ON.(Initial value OFF)
-If"FUNC"S/Wispushedwhenthedesireditemisdisplayed,theselectionissetandthenext
item is entered into.
-When"RESET"S/Wispushed,OptionSettingModeisreturnedto.
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-Settingispossiblewithintherangeof0~20(%)byusing"UP"S/W나"DOWN"S/W.
-If"FUNC"S/Wispushedwhenthedesiredvalueisdisplayed,theselectionissetandthenext
- item is entered into.
-When"RESET"S/Wispushed,OptionSettingModeisreturnedto.
- Item for setting of Emergency Time Out. Status of time setting can be determined upon checkup
- Mode.
-When"FUNC"S/Wispushed,thesettingfunctionforEmergencyTimeOutisenteredinto.
-When"RESET"S/Wispushed,OptionSettingModeisreturnedto.
-ON/OFFstatecanbesetbyusing"UP"S/W나"DOWN"S/W.InthecaseofON,checkupMode
time is operated for 30 min, while check mode time continues to be operated without restriction
in the case of OFF.(Initial value OFF)
-If"FUNC"S/Wispushedwhenthedesireditemisdisplayed,theselectionissetandthenext
item is entered into.
-When"RESET"S/Wispushed,OptionSettingModeisreturnedto.
-Themessageinformingcompletionofsettingfunctionisdisplayedas"End"for2sec,andthe
- display state of gas concentration is returned to.
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- For display of the measured value, display unprocessed data from -XXXX to +YYYY.
-When"FUNC"S/Wispushed.Thesettingfunctionfor"Under"isenteredinto.
-When"RESET"S/Wispushed,OptionSettingModeisreturnedto.
- (This Mode is used only as Test mode, and is not used in actual fields)
-ON/OFFstatecanbesetbyusing"UP"S/Wor"DOWN"S/W,wherethefunctioncanbeusedin
the case of ON.(Initial value OFF)
-If"FUNC"S/Wispushedwhenthedesireditemisdisplayed,theselectionissetandthenext
item is entered into.
-When"RESET"S/Wispushed,OptionSettingModeisreturnedto.
- Item for setting of Zero Skip.
- The value corresponding to the setting range for High scale is subject to zero skip.
-When"FUNC"S/Wispushed,thesettingfunctionfor"S-S"isenteredinto.
-When"RESET"S/Wispushed,OptionSettingModeisreturnedto.
-Settingispossiblewithintherangeof0~20(%)byusing"UP"S/Wor"DOWN"S/W.
-If"FUNC"S/Wispushedwhenthedesiredvalueisdisplayed,theselectionissetandthenext
item is entered into.
-When"RESET"S/Wispushed,OptionSettingModeisreturnedto.
- Item for setting of Span Skip.
- Span skip the value corresponding to the setting range for High scale.
-When"FUNC"S/Wispushed,thesettingfunctionfor"Eto"isenteredinto.
-When"RESET"S/Wispushed,OptionSettingModeisreturnedto.
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- Test Mode for mA Output Signal .
- When"FUNC"S/Wispushed,thesettingfunctionformAOutputisenteredinto.
- When"RESET"S/Wispushed,TestSettingModeisreturnedto.
-"ON/OFFstatecanbesetbyusing"UP"S/Wor"DOWN"S/W,andmAOUTfunctioncanbeused
- in the case of ON. (Initial value OFF)
-If"FUNC"S/Wispushedwhenthedesireditemisdisplayed,theselectionissetandthenext
- item is entered into.
-When"RESET"S/Wispushed,TestSettingModeisreturnedto.
- When Aout is OFF, mA is not outputted although the FND value is changed starting from 0 by
- using"UP"S/Wor"DOWN"S/W.(Basic3mA)
- When Aout is ON, the FND value is outputted from100, while output current is 20mA and can
- bechangedbyusingUpS/Wor"DOWN"S/W.
- (FND: 0~100, mA : 4mA~20mA)
-When"FUNC"S/Wispushed,TestModeSettingModeisreturnedto.
-When"RESET"S/Wispushed,TestModeSettingModeisreturnedto.
6.5.5. Test Mode
- Test mode function allows testing without injection of sensor gas in the detector. The user can set
- anarbitraryconcentrationvaluebypushing"UP"S/Wor"DOWN"S/W,andtheAlarmfunction
- operates normally with the concentration value designated by the user.
- When"FUNC"S/Wispushed,thesettingfunctionforTestisenteredinto.
- When"RESET"S/Wispushed,thedisplaystateofgasconcentrationisreturnedto.
- Mode for ON/OFF setting of Trouble Relay Test operation.
-When"FUNC"S/Wispushed,thesettingfunctionforTroubleRelayisenteredinto.
-When"RESET"S/Wispushed,TestSettingModeisreturnedto.
-ON/OFFstatecanbesetbyusing"UP"S/Wor"DOWN"S/W,andTroubleRelayfunctioncanbe
- used in the case of ON. (Initial value OFF)
-If"FUNC"S/Wispushedwhenthedesireditemisdisplayed,theselectionissetandthenext
- item is entered into.
-When"RESET"S/Wispushed,TestSettingModeisreturnedto.
- Mode for ON/OFF setting of Alarm Relay Test operation.
-When"FUNC"S/Wispushed,thesettingfunctionforAlarmRelayisenteredinto.
-When"RESET"S/Wispushed,TestSettingModeisreturnedto.
-ON/OFFstatecanbesetbyusing"UP"S/Wor"DOWN"S/W,andTroubleRelayfunctioncanbe
- used in the case of ON. (Initial value OFF)
-If"FUNC"S/Wispushedwhenthedesireditemisdisplayed,theselectionissetandthenext
- item is entered into.
-When"RESET"S/Wispushed,TestSettingModeisreturnedto.
■When"FUNC"S/Wispushedaftermovingby"UP"S/Wor"DOWN"S/WfollowingsettingforPassword,itcanbe
entered into.
■When10secpassesafterthelastS/WoperationinTestModefunction,thedisplaystateofgasconcentrationis
automatically returned to.
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6.5.6. 485 Setting Mode
■When"FUNC"S/Wispushedaftermovingby"UP"S/Wor"DOWN"S/WfollowingsettingforPassword,itcanbe
entered into.
■When10secpassesafterthelastSWoperationin485Modefunction,thedisplaystateofgasconcentrationis
returned to
- Mode for setting of 485 function.
- When"FUNC"S/Wispushed,thesettingfunctionfor485isenteredinto.
- When"RESET"S/Wispushed,thedisplaystateofgasconcentrationisreturnedto.
- Setting function for Channel Number as a function to set for recognition No. of Control Unit.
-When"FUNC"S/Wispushed,thesettingfunctionforChannelNumberisenteredinto.
-When"RESET"S/Wispushed,485Modeisreturnedto.
- Channel Number is the mode to input unique No. of Control Unit so as to allow checking for
- operation situation of each Control Unit in other equipment such as PC, etc. and Address No.
- valueisincreasedordecreasedwhenever"UP"S/Wor"DOWN"S/Wispushed.(Basicvalue1)
-If"FUNC"S/WispushedwhenthedesiredAddressNo.valuesdisplayed,theselectionisset
- and the next item is entered into.
-ChannelNo.issetas"1"uponfactoryshipment,andmaybeinputtedonlywhenuseof
- communication function is desired. When more than 2 units of Control Unit are used, mutually
- different Nos. must be inputted to avoid mutual overlapping of the Channel No.
- Mode for setting of Parity Bit as the format for 485 communication.
-When"FUNC"S/Wispushed,thesettingfunctionforParityBitisenteredinto.
-When"RESET"S/Wispushed,485Modeisreturnedto.
- Parity Bit is the bit added to the original information to inspect whether errors occurred in the
- process of information transmission, and the Parity Bit value is increased or decreased
- whenever"UP"S/Wor"DOWN"S/Wispushed.(Basicvalue1)
- 0 : NONE, 1: EVEN, 2 : ODD
-If"FUNC"S/WispushedwhenthedesiredParityBitisdisplayed,theselectionissetandthe
- next item is entered into.
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6.5.7. Maintenance Mode
■When"RESET"and"TEST"S/Warepushedformorethan2secinthedisplaystateofgasconcentration,thesetting
function for Maintenance is entered into.
■Thedisplaystateofgasconcentrationisreturnedtoonlywhen"RESET"S/WissurelypushedinMaintenancemode
- Mode for selection of the function of outputting current input value and output value as the
- referenceforChannelunit."In"or"oUt"isdisplayedwhenever"UP"S/Wor"DOWN"S/Wispushed.
- If"FUNC"S/Wispushedwhenthedesiredmodeisdisplayed,therelevantmodeisenteredinto.
- When"In"hasbeenselected,itisthemodeforsettingofcurrentinputvalue,whileitisthemode
- forsettingofcurrentoutputvaluewhen"oUt"hasbeenselected.
-When"RESET"S/Wispushed,thedisplaystateofgasconcentrationisreturnedto.
-SettingmodebyinputtingofmAcurrentwhen"In"hasbeenselected
- When"FUNC"S/Wispushed,thefunctionofdisplayingcurrentinputvalueasfiguresisenteredinto.
-When"RESET"S/Wispushed,thedisplaystateofgasconcentrationisreturnedto.
- Mode where the value transformed in processor by inputting 4mA current in (mA) terminal is
- displayed as figures.
-If"FUNC"S/Wispushedwhenthedisplayedfigureisstableandacurrentvaluewithinthe
- normal range is inputted, SUC(Success) is displayed and the next item is entered into.
- When a current value outside the range is inputted, C-F (Calibration-Fail) is displayed.
- After checking the current inputted as the current value is displayed again, check by pushing
- "FUNC"S/Wagain.
-When"RESET"S/Wispushed,thedisplaystateofgasconcentrationisreturnedto.
- Setting mode by inputting of 20mA current.
-When"FUNC"S/Wispushed,thefunctionofdisplayingthecurrentinputvalueasfiguresis
- entered into.
-When"RESET"S/Wispushed,thedisplaystateofgasconcentrationisreturnedto.
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6. How to operate6. How to operate

- Mode for where the value transformed in processor by inputting 20mA current in (mA) terminal is
- displayed as figures.
- If"FUNC"S/Wispushedwhenthedisplayedfigureisstableandacurrentvaluewithinthe
- normal range is inputted, SUC(Success) is displayed and the next item is entered into.
- When a current value outside the range is inputted, C-F (Calibration-Fail) is displayed.
- After checking the current is inputted as the current value is displayed again, check by pushing
- "FUNC"S/Wagain.
- When"RESET"S/Wispushed,thedisplaystateofgasconcentrationisreturnedto.
-NextmodeforinputcurrentwhenoUt"hasbeenselectedandforsettingof4mAoutputcurrent.
- (Basic value 4.00)
-If"FUNC"S/WispushedwhenthevalueofammeterandthevalueofFNDarethesameby
- pushing"UP"S/Wor"DOWN"S/Wwhilewatchingtheammeterafterconnectingtheammeterto
- 4~20mA output terminal, the output current value is set and the next item is entered into.
-When"RESET"S/Wispushed,thedisplaystateofgasconcentrationisreturnedto.
- Mode for setting of 20mA output current (Basic value 20.00).
- The value is lighted in FND by the unit of 1 sec.
-If"FUNC"S/WispushedwhenthevalueofammeterandthevalueofFNDarethesameby
- pushing"UP"S/Wor"DOWN"S/Wwhilewatchingtheammeterafterconnectingtheammeterto
- 4~20mA output terminal, the output current value is set and the next item is entered into.
-When"RESET"S/Wispushed,thedisplaystateofgasconcentrationisreturnedto.
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- Testing Mode for output current after calibration is finished. (Basic value 4.0)
-Itcanbecheckedupto3.0mA~21.0mAbyusing"UP"S/Wand"DOWN"S/W.
-When"FUNC"S/Wispushedaftercheckingisfinished,thenextitemisenteredinto.
-When"RESET"S/Wispushed,thedisplaystateofgasconcentrationisreturnedto.
-Themessageinformingcompletionofsettingfunctionisdisplayedas"End"for2sec,andthe
- display state of gas concentration is returned to.
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6.5.8. Factory initialization function(Factory Initial)
■WhenthepowersupplyisturnedONbypushing"FUNC"S/W+"UP"S/W+"DOWN"S/W,itcanbeenteredinto.
■FactoryInitialisthemodeforinitializationoftheproductdatatotheexistingdatauponfactoryshipment.
■SinceFactoryInitialismostlyFACTORYsettingfunctions,thisfunctionshouldnotbeoperated.
When inevitable, it should be operated with the support of Gastron Co. Ltd.
- Mode for initialization of the currently saved data to the existing data upon factory shipment.
- When"RESET"S/Wispushed,thedisplaystateofgasconcentrationisreturnedto.
-Enterbypushing"FUNC"S/W.
-Yes/nostatescanbesetbyusing"UP"S/Wor"DOWN"S/W.InthecaseofYes,FactoryInitial
- function can be used. (Initial value no)
-When"RESET"S/Wispushed,thedisplaystateofgasconcentrationisreturnedto.
6. How to operate6. How to operate

- Itisthefunctionusing"FUNC"S/W,thecasesforconsecutivepushingofS/Woccur.
- When"FUNC"S/WisoperateduponYes/notopreventthis,"1"->"11"->"111"->"1111"is
- outputted in FND from the left side by the unit of 0.5s .
- Uponselectionof"YES",initializationiscompleted,andthedisplaystateofgasconcentrationis
- returned to.
- Uponselectionof"no",thedisplaystateofgasconcentrationisreturnedtowithoutinitialization.
- Uponselectionof"RESET"S/W,thedisplaystateofgasconcentrationisreturnedtowithout
- outputting in FND.
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6.5.9. Initialization function for calibration data(Calibration Initial)
■WhenthepowersupplyisturnedONwith"FUNC"S/W+"DOWN"S/Wpushed,itcanbeenteredinto.
■CalibrationInitialisthefunctionforinitializationonlyofcalibrationvalueamongproduct'ssettingvaluestothe
basic setting value upon factory shipment.
- Mode where only calibration data among the currently saved data to the existing data upon
- factory shipment.
- When"RESET"S/Wispushed,thedisplaystateofgasconcentrationisreturnedto.
-Enterbypushing"FUNC"S/W.
-Yes/nostatescanbesetbyusing"UP"S/Wor"DOWN"S/W.InthecaseofYes,Calibration
- Initial function can be used. (Initial value no)
-When"RESET"S/Wispushed,thedisplaystateofgasconcentrationisreturnedto.
-Itisthefunctionusing"FUNC"S/W,thecasesforconsecutivepushingofS/Woccur.
-Enterbypushing"FUNC"S/W.
-Yes/nostatescanbesetbyusing"UP"S/Wor"DOWN"S/W.InthecaseofYes,Calibration
- Initial function can be used. (Initial value no)
-When"RESET"S/Wispushed,thedisplaystateofgasconcentrationisreturnedto.
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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
■Pleaseseewww.modbus.orgforotherdetails
CLASSIFICATION ADDRESS BITS DESCRIPTION
Concentration of
measured gas 30001 BIT15~0 Gas measured value(Integer type / Decimal Point not considered)
Setting value for
High Scale 30002 BIT15~0 Setting value for High Scale (Integer type / Decimal Point not considered)
Setting value for
1st Alarm 30003 BIT15~0 Setting value for 1st Alarm (Integer type / Decimal Point not considered)
Setting value for
2nd Alarm 30004 BIT15~0 Setting value for 2nd Alarm (Integer type / Decimal Point not considered)
State value for
Gas detector 10000
BIT0 Alarm 1 Active state
BIT1 Alarm 2 Active state
BIT2 Fault Active state
BIT3 Maintenance Mode state
BIT4 Test Mode state
BIT5 Calibration Mode state
BIT6 Reserved
BIT7 Toggle Bit(Bit inversion at an interval of 2 Sec)
Outside Test 3BIT0~7 Set for Gas detector Test Mode
Outside Reset 2BIT0~7 Gas detector Test Mode
7. Interface conguration6. How to operate
[Table 5.Configuration of RS485 MODBUS Address]

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[Figure 7. Outline drawing for GTC-520A]
Version Contents Date
0.0 Manual revised initially 2011. 08. 25
1.0 Main PCB Layout changed and functions added 2014. 01. 15
2.0 Program mode functions revised 2015. 04. 27
3.0 Font changed 2016.09.23
7. Revision record8. Outline drawing and Dimensions