Korno GT-903 Series User manual

ShenZhen Korno Import&Export Co.,Ltd
GT-903 Series Gas Detector
Portable Pump Suction Gas Detector
User
Manual
深圳市科尔诺进出口贸易有限公司
ShenZhen 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、Power.Three operation interfaces：Detection interface、Menu、
Detection interface
Menu
Parameter
setting
Up
mute
Up
Move up
Down
mute
Down
Move down
Return
mute
Return to
previous menu
Return to
previous menu
Ok
Enter menu(Hold for five
seconds)
Confirm to enter
menu
Enter/Select/Sa
ve
Run/
stop
Pump switch/
Timing detection
switch/Manually storge
mode(long press)
Void
Void
Power
On/Off(Hold for five
seconds)
Dim out/ Light up Screen
On/Off(Hold for
five seconds)
On/Off(Hold
for five
seconds)

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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.
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.

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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-Months warranty for the
detector and 3-Months warranty for the accessories. Beside , we have free
calibration 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
“run/stop” 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

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⑥Parameter modification instruction
User can modify all parameters by “Back”、“Up”、“Down”、
“Ok”buttons.
1 Product Brief Introduction
GT-903 series multifunctional gas detector are portable gas which can
be configured flexibly up to four gas sensors. With import gas sensor and
most advance nanometer semiconductor technology GT-903 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.

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Three concentration units are available; PPM,%VOL,mg/m3 (depends
on the properties of the sensor).
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 to 123,200 groups data could be storage,user could view
history data on the display and the instrument allow user output data
log.
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.

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With temperature and humidity compensating function.With dust filter
and dustproof design allow device applies in all sorts of harsh
conditions.
3 Technical Parameters
Production
type:
GT-903 series Portable Gas Detector
Sensor type:
NDIR,PID,Electrochemical,Catalytic,etc
Detection
range:
Depending on the specific sensor
Resolution:
Depending on the specific sensor
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
500ml/min.
Detection
accuracy:
≤±3%F.S(base
on different
sensor)
Linearity
error:
≤±2%F.S

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Reaction
time:
≤20seconds
（T90）
Zero drift:
≤±2%（F.S/Year）
Recovery
time:
≤20 Seconds
Repeatability
:
≤±2%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:
Ex ia IIC T4 Ga
Material：
ABS+PC
IP rating:
IP66
Temperature
:
-30 ～60℃
Power:
4000mA polymer
rechargeable
battery
Humidity:
≤90%RH，
Non-condensing
Dimension:
180*80*60 mm
（L×W×H）
0.5 Kg（Net
weight）
Pressure:
-30Kpa ～
100Kpa
Accessories:
Case、User manual、Certification、USB
charger+cable(Need the user to prepare the charging
adapter)、Calibration cover

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4 Product Structure
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

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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(O2 for example),two kinds of gas detection
mode as shown in figure 7 (O2、Combustible gas for example) ,three kinds
of gas detection mode as shown in figure 8(O2、Combustible gas、H2S for
example),four kinds of gas detection mode as shown in figure 9(O2 、
Combustible gas、H2S、CO 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(O2),channel 2 at the right
top(EX),channel 3 at the lower left(H2S),channel 4 at the lower right(CO);
figure indicate corresponding gas concentration in each channel, lower
left”O2” is the gas’s molecular formula,lower right “%VOL” is the
concentration unit; when one or several gas channel reach the alarm
value,there will be a alarm.

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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

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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;
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

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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.
User can export the data to PC. Install the corresponding Run Engine,
Set the Language compatibility, and then can open the software to check
the history log and export the data in Excel form.(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.

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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.
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)

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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 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.

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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 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.

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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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6.2.8 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.
6.2.9 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)

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6.2.10 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).
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 working environment is
high humidity, detector need to equip with vapor filter.
Man-made damage is not within warranty.