Korno GT903 Serie User manual

GT903 Series Multifunctional Gas Detecor
User Manual
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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.