Korno GT903 Serie User manual

GT903 Series Multifunctional Gas Detecor
User Manual
深 圳 市 科 尔 诺 进 出 口 贸 易 有 限 公 司
ShenZhen Korno Import&Export Co.,Ltd

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Notice
①Button description
There are six buttons beneath the display screen: Up、Down、Return、Ok、
run/stop、PowerThree operation interfaces：Detection interface、Menu、Parameter
setting.The following form is description for the six buttons.
CAUTION: GT903 series multifunctional gas detector will perform normally
only in condition of the pump is switch on.
Detection interface Menu Parameter setting
Up Void Up Move up/ Value+
Down Void Down Move down/ Value-
Return Void Return to previous
menu
Return to previous
menu
Ok
Enter menu(Hold for five
seconds) Confirm to enter menu Enter/Select/Save
Run/
stop
Pump switch/
Timing detection switch Void Void
Power
On/Off(Hold for five
seconds)
On/Off(Hold for five
seconds)
On/Off(Hold for five
seconds)

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②Gas Detector Processing Operation under Outrange Status
Users should avoid to have sensor impacted by the gas with a pressure value
greater than the maximum of the detector, which might affect the service life and
precision of the detector, or even directly damage detector.
When user accidentally makes outrange operation, he should evacuate the
instrument out of the detecting site and place it in the clean air for more than half
of an hour. During this time, user should observe whether the density value of the
instrument is keeping decreasing or not. If it can straightly go down to normal
value, then it can continue to use after the zero calibration of instrument. If the
instrument has evacuated from hazardous area after the outrange operation and
user has placed it in clean air for hours, the density value still remains high, then
it should be sent back to the manufacturer or agent for maintenance, be ready to
replace the sensor.
Special Note: detector damage resulted from outrange operation is not within
the warranty.
③Detector Calibration and Warranty
We guarantee all detectors were being precisely calibrated with certain
density standard gas. It’s not necessary for user to re-calibrate the detector after
purchase unless encounter special situation. Also the calibration need to be
operate under the guidance of the professional.
All GT903 series products we provide 12-Mounths warranty for the detector
and 3-Mounths warranty for the accessories. Beside , we have free calibration

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once a year during the entire products service life.
④Instruction of detector display dimmed out
Power capacity protection program had been preset for all GT903
multifuncional gas detector, when no operations were made within 30 seconds the
protection program will activate and the display of the detector will dim out,user
can light up the display by press power button.
⑤GT903 series hot key instruction
Mute: When detector is in the state of alarming user can mute the detector
by pressing the “Up”or “Down”button.
Save manually:When storage mode was preset as manually, user can save
the gas concentration value of each channel by long press the “Up” button in
detection interface
Function menu: When detector is in the detection menu user can enter
system menu by pressing “Ok” button for 5 seconds
⑥Parameter modification instruction
User can modify all parameters by “Back”、“Up”、“Down”、“Ok”buttons.

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1 Product Brief Introduction
GT903 series multifunctional gas detector are portable gas and dust detector
which can be configured flexibly up to four gas sensors.With import gas sensor
and most advance nanometer semiconductor technology GT903 series
multifunctional gas detector can detect four kinds of gas and dust concentration at
the same time rapidly and precisely,we maintain a leading position in domestic
level and our products are famous of high stability and repeatability .User can
custom setting all parameters to ensure the operations are user-friendly.The
device provides 4000mA built-in high capacity polymer rechargeable
battery,technical indicators、gas concentrations and history data can be display in
the 2.4 inches technical grade screen,User can save concentration data、output
data、detect temperature and humidity level.
2 Key Feature
With the most advance nanometer semiconductor technology ,ultra low
power 32bit microprocessor,24bit ADC data acquisition chip.
2.4 inches technical grade display with a pixel up to 320*240,display
technical indicators and gas concentration value perfectly.
Three concentration units are available; PPM,%VOL,mg/m3.
Simultaneously detection can be perform(1-4 kinds of gas),User can
combine different sensor freely,temperature、humidity sensor and other kind
of sensor are available.
Up to 30,800 group data could be storage,user could view history data on the

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display and the instrument allow user output datalog.
With temperature and humidity detection,user can detect
temperature and humidity value on the scene or the
temperature and humidity value inside the pipe.
Four operation modes are optional:Detection mode、Storage mode、Display
mode、Pumping mode.
With high-power pump allow device working under tiny negative pressure
condition,the reasonable gas chamber design ensures that the sensor is not
affected by the pressure.
With overvoltage protection,overcharge protection,electrostatic
prevention,magnetic-field interference prevention
All software automatic calibration, sensor up to 6 levels target
calibration,ensure the accuracy and linearity of the entire measurement,also
with data recovery function.
Chinese and English operation model are available,user-friendly.
With temperature and humidity compensating function.With dust filter and
dustproof design allow device applies in all sorts of harsh conditions.

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3 Technical Parameters
Production
type: Single gas detector(Customize according user’s need)
Detection
range: Please refer to the sensor list
Resolution: Please refer to the sensor list
Temperature
and humidity
(optional):
Temperature:-40 ～120℃
Humidity:0-100%RH
Detection mode: Pumping,With high-power pump allow device working under
tiny negative pressure condition,flow rate is adjustable.
Detection
accuracy: ≤±3%F.S Linearity error: ≤±1%F.S
Reaction time: ≤20seconds（T90）Zero drift: ≤±1%（F.S/Year）
Recovery time: ≤20 秒Repeatability
:≤±1%F.S
Detection mode: Real-time detection、timing-detection
Storage mode：Auto storage、manually storage,Up to 30,800 group data can be
storage,history data can be shown at display
Explosion proof
sign: ExdII CT4 Material：ABS+PC
IP rating: IP65 Temperature
:-30 ～60℃

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Power: 4000mA polymer
rechargeable battery Humidity: ≤95%RH， Non-condensing
Dimension:
180*80*60 mm
（L×W×H）
0.5 Kg（Net weight）
Pressure: -30Kpa ～100Kpa
Accessories: Dust filter、Case、User manual、Certification、USB
charger+cable、Calibration cover
4 Product Structure

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5 Operation Instruction
5.1Power On
Long press power button for five seconds until the “DI” sound then the
display and red signal light turn on,The screen appears:Sensor checking (3
seconds),Sensor information(1 second) ,Sensor preheating and automatically start
the pump(60 seconds count down)in sequence as it show in figure 1-3,detector
will start after the count down and enter detection interface as it show in figure 4
5.2Power Off
In normal detection mode long press power button for five seconds
until the “DI” sound ,display shows shutting down as it show in figure 5,device
will be shutoff within 1 minute .

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6 Operation Interface
6.1 Gas Detection Interface
Under normal-detection mode,according to the number and types of sensors
in the device,there are different interfaces: single gas detection mode as shown in
figure6(O3 for example),two kinds of gas detection mode as shown in figure 7
(O3 、CO for example) ,three kinds of gas detection mode as shown in figure
8(O3、CO、CH2O for example),four kinds of gas detection mode as shown in
figure 9(O3、CO、CH2O,Combustible gas for example)
The icons at the left top of the the display (refer to figures above) are time
and temperature, at the right top of the display shows the “pump status”,”battery
capacity”,”humidity”,take figure 9 for example,there are four channels ,channel 1
at the left top(O3),channel 2 at the right top(CO),channel 3 at the lower
left(CH2O2),channel 4 at the lower right(EX);figure indicate corresponding gas
concentration in each channel,lower left”o3” is the gas’s molecular formula,lower
right”PPM” is the concentration unit;when one or several gas channel reach the
alarm value,there will be a alarm sign under corresponding concentration
figure,as shown in figure 9 the CH2O channel is alarming.

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6.2 Function Menu Instruction
Long press”OK” button for 5 seconds to enter function menu as shown in
figure 10. Nine sub-menus are including in function menu:Basic setting、History
Log、RealTime Curve、Zero Calibration、Target Calibration、Alarm setting、
Measure Mode、Storage Setting、Time Setting、Factory Setting.In main menu
move the cursor to different sub-menu by press “Up” and “Down”button,press
“Ok” to enter corresponding sub-menu,press “Back” to return to normal detection
interface.
6.2.1 Basic Setting
In Basic setting menu user can see various setting as shown in figure
11,press “Up” and “Down” button to move the cursor , press “Ok”to enter
sub-menu and modify parameters.
In “Sensor Setting” menu user can check and modify gas detection range
and unit(PPM、mg/m³、VOL% freely switch ) as shown in figure 12;
In “Channel Setting” menu user can set to activate/shield one or various gas
channels as shown in figure 13;
In “Temp Correction” & “Humi Correction” menu user can manually adjust
the value of temperature and humidity as shown in figure 14-15;

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In “language setting”user can change system language to all Chinese or all
English as figure 16.
6.2.2 History Log
User can view previous gas concentration data or delete history data in
“History Log” menu as shown in figure 17.In this sub menu has 5 options:
“Check History Log”,“History Log Curve”,“Hsitory Log Export”,“Clear CH
History Log”,“Clear All History Log” .
In “Check History Log” menu user can view the quantity of history
log(figure 18) Move the cursor to “Check” and then press “OK” button to view
the details as shown in figure 19.(NOTE:up to 30,800 groups of data can be
storaged)
In “History Log Curve” menu user can view the curve of History Log as
shown in figures 20-21.
In “History Log Export
”
menu,user can export the data to PC.

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Press “OK” button to enter this sub menu and then will see the steps about history
log export.(figure 22)
Note:“Clear CH History Log” is to clear history data of specific
channel,Clear All History Log” is to clear history data of all channels.
6.2.3 Real Time Curve
User can view the curve of real time data in this menu as it shown in figures
23-24.

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6.2.4 Zero Calibration
If zero drift of the sensor is over range, user can proceed zero calibration ,the
gas concentration are defaulted set to zero after zero calibration as shown in
figure 26.
Special Note: Zero calibration must be proceed in fresh air or high-purity
inert gas(for example 99.999%VOL N2 etc)
6.2.5 Target Calibration(Do Not Calibrate Unless You Are
Professional)
GT-903 series gas detector provide 6 levels target gas concentration
calibration,as shown in figure 27-28,this calibration should be operate under
conditions of certain standard concentration gas, Pressure reduction valve ,Flow
meter, Calibration cover and make sure all instruments are well connected,
otherwise this function is forbidden.
Procedures: Connect all instruments as shown in figure 29,enter target gas
calibration interface,release standard gas slowly and control gas flow within
500ml/min,observe the real-time concentration value(concentration value should
be increasing),wait until real-time concentration value rise to the peak reading and

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stay still, user can chose a un-calibrate option to operate(√ indicate this level has
been calibrated and × indicate this level still need to be calibrate);first of all input
a concentration value of standard gas then calibrate. Target gas concentration
value will set up to be the standard gas concentration value after calibration.
6.2.6 Alarm Settings
User can set the alarm limit and alarm mode in this menu, as shown in
figures30-31,there are two alarm value setting, which are high alarm and low
alarm. When user set as the low alarm mode, it will trigger alarm when real-time
concentration is lower than preset value , when user switch to high alarm mode, it

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will trigger alarm when real-time concentration is higher than preset value.
Procedures: Enter alarm settings sub-menu, Move the cursor to “alarm
mode”,press “Ok” to select and press “Up” and “Down” to switch alarm mode,
then press “Ok” to save your modification.
6.2.7 Measure Mode
In this menu.real-time detection and timing detection are optional as it
shown in figure 32.When detector is preset as “Real Time Measure”,it provides
continuous monitoring and will shows real-time concentration in the display.As it
shown in figures 33,the device will detect the average concentration value of a
certain time period when preset as “Fixed Time Measure”,it allows user to set
timing cycle and cycle interval(interval of two timing detection),if the periodic
detection mode is not activated,gas pump and detection process will automatically
stops.

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6.2.7 Storage Setting
In this menu.rmaual store mode and auto store mode are optional as it shown in
figure 34.It also allows user to set storage cycle(unit:second) under auto store
mode as it shown in figure 35.
6.2.8 Time Setting
Time setting menu allow user to set date and time,this time is related to the
time of the concentration values are being recorded.(figure 36)
6.2.9 Factory Setting
If user proceeded an wrong operation by accidentally or need to reset all
parameters to factory setting,you can reset all parameter to factory setting(figure
37).

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7 Other Notice
Please read User Manuel carefully before use the detector.
It is strictly forbidden user to disassemble the detector or replacement parts.
Installation, adjustment, calibration and parameters setting must be progress
by professionals.
Regular inspection of calibration is necessary, expired or broken sensor
should be replace immediately.
It is strictly forbidden to impact sensor with gas which is over detection
value.
User should prevent drop or impact the detector.
It is strictly forbidden to use detector in high temperature, high humidity or
high pressure environment ,if workingenvironment is high humidity, detector
need to equip with vapor filter.
Man-made damage is not within warranty.
To reduce the risk of ignition of hazardous atmospheres, recharge, remove or
replace the batteryonly in an area known to be non-hazardous.Do not mix old
and new batteries or batteries from different manufacturers.
Electrostatic discharge should be proceed before the detection in hazardous
area
GT 903 series products shall only be charged outside hazardous areas,it is
strongly recommend use the original charger.

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8 Concentration Datalog Output Instruction
GT 903 series gas detector allow user output history datalog via the charge
port,there are several steps to output datalog.
1) Install concentration datalog output software in host computer
2) Boot up the detector and wait for 60s to preheat the instrument and connect
to the computer
3) Run the concentration datalog output software in the host computer,make
sure the detector is connected to the host computer,meanwhile at the lower
left interface of the software will show connection port standby(defaulted
baud rate is 115200,do not change)
4) Enter the history data interface to output datalog,there will be menu prompts
at the both software and detector interface.
5) User can preset detector’s address in concentration datalog output
software(this address need to corresponded to the parameter in “address
setting”of the detector) 、Channel(Corresponded to the gas channel of the
detector)、start time and finish time(datalog storage period should be within
the start and finish time)
6) Detector allows user to search concentration of certain channel of datalog
storage period,datalog can be output as EXCEL format by “datalog output”
function.
NOTICE:Connection cable is the USB cable connected to the adapter

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深 圳 市 科 尔 诺 进 出 口 贸 易 有 限 公 司
ShenZhen Korno Import&Export Co.,Ltd
ADD: 4E.Building #1. NO 6.LiuFang Road. 67District. BaoAn.ShenZhen
TEL: [phone]-666
VIP HOTLINE: [phone] Ms Wang
FAX: [phone]-55
E-MAIL: [email protected]