GASTRON G-Finder Multi User manual

G-Finder Multi (O
2
/ CO / H
2
S / CH
4
) Portable Multi Gas Detector
GT-079 907250 PAGE 1 of 14 Rev .0(2020.05. 8)
G
GG
G-
--
-Finder
Finder Finder
Finder Multi
MultiMulti
Multi
Instruction Manual
Instruction ManualInstruction Manual
Instruction Manual
G-Finder Multi is a personal safety device
designed to detect the presence of Oxygen (O
2
),
Carbon Monoxide (CO), Hydrogen ulfide (H
2
),
combustible gases (default target combustible gas
is methane, CH
4
). Power is provided by one, non-
user replaceable, lithium-thionyl chloride primary
2-cell. The unit includes LCD display to show
readings, as well as audible, visual, and vibrating
alarms are supported when user-configurable
values are exceeded. It is your responsibility to
respond appropriately to the alarms. G-Finder
Multi has no facilities for connection of external
electrical circuits. G-Finder Multi has IR
communications for changing the alarm set point,
calibration range and etc. The IR communications
shall only be used in safe area.
WARNING
1) G-Finder Multi is designed for single use. Non-
field replaceable lithium-ion battery, filter and
sensor are already installed and ready for use.
2) Do not attempt replacement or substitution of
components. eplacement or Substitution of
components may IMPAI Intrinsic Safety and
will void the warranty of the product.
3) The electrical, electronic and battery elements
of this product must not be disposed of via
municipal waste streams; they should be
disposed of by a qualified recycler or
hazardous materials handler. Correct disposal
will contribute to recycling of materials and
prevent negative consequences for the
environment.
4) It is recommended performing a bump test
prior to use G-Finder Multi every day to
confirm sensor response and alarm activation
by exposing the detector to a concentration of
target gas that exceeds the low alarm set
point.
5) For optimal performance, please proceed zero
calibration periodically.
6) G-Finder Multi is provided with anti-static
coating over the LCD window to minimize risk
of ignition due to electro-static discharge.
Periodic inspection of this coating is required
to ensuring prevention of degradation,
delamination, abrasions or other deformities
to the surface. Please make sure to clean only
with a damp cloth.
7) For all gas types of G-Finder Multi, always
proceed bump test and calibration at room
temperature and in a fresh air environment
(20.9% v/v O
2
) that is free of hazardous gas.
CAUTION
1) Activate G-Finder Multi before the activation
date on the package.
2) In order to maintain normal operation of G-
Finder Multi, keep the gas sensor grill from
clogging and keep the gas sensor, LED and
buzzer hole surfaces free from dust and dirt.
Clean the exterior with a soft and damp cloth.
3) When using G-Finder Multi, sudden change in
the temperature may cause change in the
detected gas concentration value suddenly.
Using in a stable temperature environment is
recommended for more accurate detection.
4) The combustible gas sensor is initially
calibrated to 50%LEL methane. Only methane
gas should be used to calibrate or bump test
the combustible gas sensor.
5) G-Finder Multi is a gas detector, not a
measurement device.
6) Portable safety gas detectors are life safety
devices. Accuracy of ambient gas reading is
dependent upon factors such as accuracy of
the calibration gas standard used for
calibration and frequency of calibration.

G-Finder Multi (O
2
/ CO / H
2
S / CH
4
) Portable Multi Gas Detector
GT-079 907250 PAGE 2 of 14 Rev .0(2020.05. 8)
1. Specification
Item Description
Ex marking II 1 G Ex ia IIC T4 Ga
Approvals
IECEx : IECEx KTL 19.0028X
KCs : 19-KA2BO-0915X
ATEX : DEKRA 19ATEX0132X
NEPSI : GYJ20.1019X
KC : R-C-G99-GFM-400
Dimensions
120x68x41 mm
(Alligator clip included)
Weight 221 g (Alligator clip included)
Temperature -20°C ~ 50 °C
Humidity 5 ~ 95 % RH
IP IP 68
ensor type
O
2
– electrochemical cell
CO– electrochemical cell
H
2
– electrochemical cell
C
4
or C
3 8
– Non-Dispersive
Infrared Sensor
* C
3 8
is an option in the future.
Alarms Visual, vibrating, audible (min. 95dB)
Display Liquid Crystal Display (LCD)
Operating
frequency 2402 MHz ~ 2480 MHz
RF output
power -11.08 dBm
Max. RF
Distance
≤ 7m (at the non-interference
environment)
Battery Primary lithium-thionyl chloride (Li-SOCl2)
Event Log Last 128 events.
Newer events replace older events.
Battery Life
24 months of operation when 2
minutes of alarm occurs per day
Warranty Full 2 years
2. Each part for G-Finder M lti

G-Finder Multi (O
2
/ CO / H
2
S / CH
4
) Portable Multi Gas Detector
GT-079 907250 PAGE 3 of 14 Rev .0(2020.05. 8)
3. LCD Icons Description
Icon Description
LOW alarm and HIGH alarm.
These signs are displayed when gas
concentration exceeds alarm
setpoints.
TEL ( hort Term Exposure Limit)
alarm. Displays when gas
concentration exceeds alarm
setpoints
TWA (Time Weighted Average)
alarm. Displays when gas
concentration exceeds alarm
setpoints
Calibration reminder. This icon is
displayed when a sensor
calibration is due. / indicates a
failed calibration.
Bump test reminder. If the detector
is configured to display a bump
test reminder, this icon is displayed
when a bump test is due. /
indicates a failed bump test.
This icon is displayed when a
functional error occurs.
This icon is displayed when the
Bluetooth is connected.
This icon is displayed when all
alarm signal is off.
This icon blinks when the detector
works normally without any
functional errors.
Displays for remaining product life
time.
Oxygen concentration is measured
as percent by volume.
Combustible gas concentration is
measured as lower explosive limit.
Toxic gas concentration is
measured as parts per million.
Alarm event indicator. This icon is
displayed when an alarm event has
occurred within the past 8 hours.
End of operating life
warning indicator.
Low battery warning indicator.
When this symbol is displayed,
press the button once or hold until
the symbol disappears
Time Indicator.
(Remaining product life with 00M /
00d / 00h display, 00 means
remaining months / days / hours)
4. Activating the New Detector
1) Move to normal atmosphere (20.9% v/v O2)
free of hazardous gas.
2) Press and hold the button until 5 second
countdown is displayed, then keep holding
until the countdown is completed to activate
G-Finder Multi.
3) When the countdown is completed, the LCD,
LEDs, vibration, and beep will be on and off.
Then, the alarm setpoints are displayed and
the sensor stabilization countdown is
displayed.

G-Finder Multi (O
2
/ CO / H
2
S / CH
4
) Portable Multi Gas Detector
GT-079 907250 PAGE 4 of 14 Rev .0(2020.05. 8)
4) When the countdown is completed, the
activation is completed.
※ When the countdown reaches 0, the zero
calibration is performed automatically and
after the zero calibration, the activation is
completed.
5) The detector is in normal operating mode
when the gas type and concentration are
displayed.
5. Normal Operating Mode
1) When the detector is in normal operating
mode, the type of gas detected is permanently
displayed. The detected concentration of the
gas is displayed until it is disrupted by a button
action, gas alarm, or error event.
If you want to see the status information
about the detector, please press the button
once.
Normal
2) By pressing the button once, it will display
current firmware version of the detector. The
number before the underscore ’_’ indicates
major number of the firmware version, and
the number after the underscore indicates
minor number. In other word, “1_00”
indicates the firmware number ‘1.00’.
Firmware Version
3) By pressing the button once from the above
phase, it will display the remaining product
life. The remaining life will be counted
automatically refer to the remaining life scale;
“24M” ~ “1M”, “30D” ~ “1D”, “24H” ~ “1H”.
(M: Months, D: Days, H: Hours)
Remaining Product Life
4) Pressing the button once again from the
above phase, it will display low alarm set
value.
Low Alarm Set Value
5) Pressing the button once again from the
above phase, it will display high alarm set
value.
High Alarm Set Value
6) Pressing the button once again from the
above phase, it will display hort Term
Exposure Limit ( TEL).
STEL Alarm Set Value
7) Pressing the button once again from the
above phase, it will display Time Weighted
Average (TWA) alarm set value.

G-Finder Multi (O
2
/ CO / H
2
S / CH
4
) Portable Multi Gas Detector
GT-079 907250 PAGE 5 of 14 Rev .0(2020.05. 8)
TWA Alarm Set Value
8) If there are not any alarm events occurred
within the past 8 hours, the display
information on the LCD is changed to the
normal display from the TWA alarm set value
by pressing the button once.
9) Or if there are any alarm events occurred
within the past 8 hours, it will show elapsed
time since the alarm occurred from the TWA
alarm set value by pressing the button once,
and then it is changed to the alarm value
occurred by pressing the button once again,
and it is changed to the normal display by
pressing the button once again.
Elapsed Time
Alarm Value Occurred
6. Alarms
An alarm is initiated when the sensor is exposed
to a gas concentration exceeding alarm setpoints.
The alarm has four types, low alarm; high alarm;
TEL alarm; TWA alarm.
The alarm persists until the gas concentration
returns to an acceptable range. Battery life
decreases rapidly when the detector is in alarm
condition.
For the gas type O
2
, a low alarm occurs when the
measured concentration value is lower than the
low alarm setting value, while a high alarm occurs
when the measured concentration value is higher
than the high alarm setting value.
The following alarm settings are default for each
gas type.
Gas Type Low Alarm High Alarm
O
2
9.5% v/v O
2
23.5% v/v O
2
CO 30 ppm 200 ppm
H
2
S 0.0 ppm 5.0 ppm
CH
4
0% LEL 20% LEL
When the alarm occurs, LED lights flash, vibration
and beep sounds occur, and display will be
changed as below for example.
When the TEL alarm or/and the TWA alarm
occurs, or/and icon is indicated and
LED lights flash, vibration and beep sounds occur.
The TEL alarm and the TWA alarm are latching
alarms. These alarms will hold the detector with
LED lights flash, vibration and beep sounds until
the acknowledgement action is done. In order to
acknowledge and release the alarm, press the
button twice and the display on the LCD screen
will be changed as below for example.
Press and hold the button until 3 seconds
countdown is displayed, then keep holding until
the countdown is completed for the
acknowledgement action.

G-Finder Multi (O
2
/ CO / H
2
S / CH
4
) Portable Multi Gas Detector
GT-079 907250 PAGE 6 of 14 Rev .0(2020.05. 8)
When the countdown is completed, “ACK?” will
be changed to “ACK OK” on the LCD screen as
below for example, and then the alarm will be
released.
When G-Finder Multi detects gas concentration
which is over the upper limit of the detection
range, the concentration display part on the LCD
screen will be changed to “O-V” as below for
example.
7. B mp Test
1) Press the button twice to get into the menu, it
shows "BUMP TE T" on the screen.
2) Press and hold the button until 3 seconds
countdown is displayed, then keep holding
until the countdown is completed in order to
perform the bump test.
3) Then the gas applying display, the low alarm
setpoint display, and the high alarm setpoint
display occur cross and the detector waits for
applying gas which causes an alarm.
4) If the detector detects the gas concentration
of all 4 types for the bump test in 60 seconds,
the bump test process is performed
automatically. The result will be displayed on
the screen at the end of the test. If an alarm
occurs during the bump test, the test is
succeeded, otherwise the test is failed. If the
test is failed, icons are appeared
additionally with the bump test mode display
on the screen.
8. Zeroing the Sensor
In case of O
2
sensor, over time and through use,
the sensor baseline at zero exposure may drift
from the manufacturer’s baseline.
For optimal performance of O
2
sensor, it is
recommended to zero the O
2
sensor at least once
in a month at the condition of room temperature
and in a fresh air environment (20.9% v/v O
2
) free
of hazardous gas.
The user will be noted by the display of the
calibration reminder icon when the sensor
calibration is due. If the icon is showing please
zero the sensor as instructed below:
※ For all gas types, we recommend zeroing
for the sensors periodically.
1) Move to a normal atmosphere (20.9% v/v O
2
)
free of hazardous gas.
2) Press the button twice to get into the menu.
Then, "BUMP TE T" will be displayed on the

G-Finder Multi (O
2
/ CO / H
2
S / CH
4
) Portable Multi Gas Detector
GT-079 907250 PAGE of 14 Rev .0(2020.05. 8)
screen. And “ZERO TE T" is displayed on the
screen by pressing the button once again.
3) Zero can be performed one of two modes by
selection. User can select to calibrate the
entire gas type at once, or select to calibrate
each gas types individually.
4) Press the button twice in order to enter
selecting menu for the zeroing when the
“ZERO TE T" is displayed on the screen.
Otherwise, press the button once to the next
menu, Gas Calibration Menu.
5) If you enter selecting menu for the zeroing by
pressing the button twice when the “ZERO
TE T" is displayed on the screen, “ALL - ZERO”
is displayed first, and the display changes to
“O2 - ZERO”, “COMB - ZERO”, “H2 - ZERO”,
and “CO - ZERO” sequentially by pressing the
button.
6) When the corresponding zero calibration
menu is displayed, press and hold the button
until 3 seconds countdown is displayed, then
keep holding until the countdown is
completed in order to perform the selected
zero calibration.
7) Then, the zeroing process will be performed
automatically. Wait until the zeroing process is
completed.
8) When the zeroing process is completed,
"PA " or "FAIL" appears.
9) After displaying the result, "ZERO TE T" is
displayed on the screen again automatically.
10) If "FAIL" appears, repeat the zeroing process
according to the procedure above.
11) If the zeroing process fails again, please
contact our service center.
12) In order to calibrate gas, press the button
once, and " PAN TE T" will be displayed on
the screen. Continue calibrating according to
the "Gas Calibration" section.
13) Or in order to exit the menu, press the button
repeatedly to go back to normal operating
mode.
9. Gas Calibration
For more optimal performance of G-Finder Multi,
gas calibration may be needed. In order to
calibrate the detector, we recommend gas
calibration after doing zero calibration at room
temperature and in a fresh air environment
(20.9% v/v O
2
) that is free of hazardous gas.
By default, G-Finder Multi is configured to use the
following calibration gas mixtures:

G-Finder Multi (O
2
/ CO / H
2
S / CH
4
) Portable Multi Gas Detector
GT-079 907250 PAGE 8 of 14 Rev .0(2020.05. 8)
Gas Type
Standard Calibration Gas
Concentration
O
2
8.0 % v/v O
2
CO 00 ppm (balance N
2
)
H
2
S 25 ppm (balance N
2
)
CH
4
50 % LEL (balance N
2
)
1) Move to a normal atmosphere (20.9% v/v O
2
)
free of hazardous gas.
2) Press the button twice to get into the menu.
Then, "BUMP TE T" will be displayed on the
screen. "ZERO TE T" will be displayed on the
screen by pressing the button once, and then,
" PAN TE T" will be displayed on the screen
by pressing the button once again.
3) ame as the zeroing procedure, the gas
calibration can be performed by two modes.
User can select to calibrate the entire gas type
at once, or select to calibrate each gas types
individually.
4) Press the button twice to enter selecting
menu for the gas calibration when the “ PAN
TE T" is displayed on the screen. If the button
is pressed only once, it will skip to the next
menu.
5) If you enter selecting menu for the gas
calibration by pressing the button twice when
the “ PAN TE T" is displayed on the screen,
“ALL - PAN” is displayed first, and the display
changes to “O2 - PAN”, “COMB - PAN”,
“H2 - PAN”, and “CO - PAN” sequentially
by pressing the button.
6) When the corresponding gas calibration menu
displays, press and hold the button until 3
seconds countdown is displayed, then keep
holding until the countdown is completed.
7) The gas applying display and the standard
calibration gas concentration display occur
cross and the detector waits for applying
calibration gas.
8) If G-Finder Multi detects the gas
concentration for the gas calibration, the gas
calibration process will be performed
automatically. Wait until the gas calibration
process is completed.
※ If you press the button during the gas
calibration process, the gas calibration
process will be cancelled.
9) When the gas calibration process is
completed, "PA " or "FAIL" appears.

G-Finder Multi (O
2
/ CO / H
2
S / CH
4
) Portable Multi Gas Detector
GT-079 907250 PAGE 9 of 14 Rev .0(2020.05. 8)
10) After displaying the result, " PAN TE T" will
be displayed on the screen again
automatically.
11) If "FAIL" appears, repeat the gas calibration
process according to the procedure above.
12) If the gas calibration fails again, please
contact our service center.
13) Press the button repeatedly to go back to
normal operating mode.
10. IRDA Communication
Mode
IRDA communication mode is provided basically.
eparate PC software is required to use this mode.
Through this mode, it allows to check the internal
information of the G-Finder Multi and change
alarm settings, etc.
※ Battery life decreases faster while using
IRDA communication mode. It is
recommended to save battery by using
IRDA communication mode only when
absolutely necessary.
1) Press the button twice to get into the menu.
Then, "BUMP TE T" will be displayed on the
screen. And "IRDA MODE" will be displayed
on the screen by pressing the button three
times.
2) Press and hold the button until 3 seconds
countdown is displayed, then keep holding
until the countdown is completed in order to
perform the IRDA communication mode.
3) Then, the display on the screen is changed to
“I-ON”, which indicates that the IRDA
communication mode is ready for normal
operation. While “I-ON” is displayed on the
screen, perform the desired operations
through the PC software.
4) In order to exit the communication mode,
while “I-ON” is displayed on the screen, press
and hold the button until 3 seconds
countdown is displayed, then keep holding
until the countdown is completed.
5) When the countdown is completed, “I-OFF” is
displayed on the screen for a while, then
return to the communication mode menu and
“IRDA MODE” will be displayed.
6) For more information of PC software related
to IRDA communication, please refer to the
‘G-Finder PC software user manual’.
11. Bluetooth Communication Mode
G-Finder Multi supports Bluetooth communication
mode for user convenience, and the availability of
Bluetooth communication mode is determined by
option when ordering.

G-Finder Multi (O
2
/ CO / H
2
S / CH
4
) Portable Multi Gas Detector
GT-079 907250 PAGE 10 of 14 Rev .0(2020.05. 8)
While using Bluetooth communication mode, blue
LED flashes and the gas concentration
measurement value is transmitted once every 10
seconds in normal condition (once every 2
seconds when an alarm occurs) to the connected
Bluetooth device. It allows user to monitor
remotely through the connected Bluetooth device.
※ Battery life decreases faster while using
Bluetooth communication mode. It is
recommended to save battery by
disconnecting Bluetooth communication
mode while not using Bluetooth
communication mode.
※ For G-Finder Multi, which does not
support Bluetooth option, below figures
of screen will not be displayed.
1) Press the button twice to get into the menu.
Then, "BUMP TE T" will be displayed on the
screen. "BLE-XX XX:XX:XX" will be displayed
on the screen by pressing the button four
times. (it will not be shown if G-Finder Multi is
without Bluetooth option)
“XX XX:XX:XX” is the last four groups of two
hexadecimal digits of the Bluetooth MAC
address of the G-Finder Multi. In the example
below, G-Finder Multi with “ED:6D:34:20” as
the last four groups of two hexadecimal digits
of the Bluetooth MAC address is shown.
2) Press and hold the button until 3 seconds
countdown is displayed, then keep holding
until the countdown is completed in order to
enable the connection of Bluetooth
communication mode.
3) Then, “ON- XX XX:XX:XX” is displayed on the
screen and the icon blinks to wait for a
connection from the Bluetooth device.
4) Run the application on the Bluetooth device,
search and select GFM-400 which has the
same MAC address with the last four groups
of two hexadecimal digits of the MAC address
on the GFM-400 LCD screen.
5) When the Bluetooth communication between
the Bluetooth device and GFM-400 is initially
connected, various internal values of the
corresponding G-Finder Multi are transmitted
to the device. When transmission and
connection are completed, the screen
automatically switches to the Bluetooth mode
screen and the icon lights up continuously.
After this moment, the Bluetooth
communication connection will be completed
successfully and the Bluetooth communication
mode will be operated normally with
transmitting the gas concentration
measurement value periodically and the blue
LED flashing.
6) In order to disconnect and disable Bluetooth
communication mode, proceed the above
procedure ‘1)’ until "BLE-XX XX:XX:XX" and
the icon is displayed on the screen as
shown at the above procedure ‘5)’.
7) Press and hold the button until 3 seconds
countdown is displayed, then keep holding
until the countdown is completed in order to

G-Finder Multi (O
2
/ CO / H
2
S / CH
4
) Portable Multi Gas Detector
GT-079 907250 PAGE 11 of 14 Rev .0(2020.05. 8)
disable the connection of Bluetooth
communication mode.
8) When the countdown is completed, “OFF-XX
XX:XX:XX” is displayed on the screen for a
while and then return to the communication
mode menu. It will show MAC Address, “BLE-
XX XX:XX:XX” without icon.
12. Silent Mode
G-Finder Multi supports ilent mode. When ilent
mode is on, the alarm function does not work
even when G-Finder Multi is exposed to gas
concentrations exceeding the alarm set value.
1) Press the button twice to get into the menu.
Then, "BUMP TE T" will be displayed on the
screen. " ILENT MODE" will be displayed on
the screen by pressing the button five times.
(or four times in case of G-Finder Multi
without Bluetooth option)
2) Press and hold the button until 3 seconds
countdown is displayed, then keep holding
until the countdown is completed in order to
perform the ilent mode.
3) When countdown is completed, “ ILENT-
ON” is displayed on the screen for a while,
then return to the ilent mode menu with
icon. After this moment, this ilent
mode is turned on with icon lights up
continuously.
4) In order to turn off the ilent mode, proceed
the above procedure ‘1)’ until “ ILENT
MODE” displays, and icon is displayed
on the screen as shown at the above
procedure ‘3)’.
5) Press and hold the button until 3 seconds
countdown is displayed, then keep holding
until the countdown is completed.
6) When countdown is completed, “ ILENT-
OFF” is displayed on the screen for a while
and return to the ilent mode menu without
the icon.
13. Light Mode
G-Finder Multi supports Light mode related to
LCD back-light . When this Light mode is turned
on, the LCD backlight flashes when an alarm
occurs, and the LCD backlight lights up for 2
seconds each time the button is pressed, making
it easy to check the LCD display screen in a dark
environment.

G-Finder Multi (O
2
/ CO / H
2
S / CH
4
) Portable Multi Gas Detector
GT-079 907250 PAGE 12 of 14 Rev .0(2020.05. 8)
※ Battery life decreases faster when the LCD
back-light is turned on. If you do not need
the LCD back-light, it is recommended to
save battery by turning the LIGHT mode
off.
1) Press the button twice to get into the menu.
Then, "BUMP TE T" will be displayed on the
screen. "LIGHT MODE" will be displayed on
the screen by pressing the button six times.
(or five times in case of G-Finder Multi
without Bluetooth option)
2) Press and hold the button until 3 seconds
countdown is displayed, then keep holding
until the countdown is completed in order to
perform the Light mode.
3) When the countdown is completed, “LIGHT-
ON” is displayed on the screen for a while then
return to the Light mode menu.
4) In order to turn off the Light mode, proceed
the above procedure ‘1)’.
5) Press and hold the button until 3 seconds
countdown is displayed, then keep holding
until the countdown is completed in order to
turn off the Light mode.
6) When the countdown is completed, “LIGHT -
OFF” is displayed on the screen for a while
then return to the Light mode menu.
14. Detection Range
Please refer to the below table for the Detection
ranges.
Gas Type Detection Range
O
2
0 to 25.0% Vol
with 0. increments
CO 0 to 300 ppm
with increment
H
2
S 0 to 00 ppm
with 0. increments
CH
4
0 to 00% LEL
with increment
15. Detectable Combustible Gases
G-Finder Multi combustible gas sensor is
optimized for methane detection. The sensor is
able to detect and respond to the other
combustible gases shown in the table below, but
the accuracy of the measured gas concentration
values may not be consistent.
Combustible
Gas
Expected response
at 20% LEL target gas
Methane(CH 4 ) 20 %LEL
Propane(C 3 H 8 ) 5 ~ 45 %LEL
Butane(C 4 H 10 ) 5 ~ 35 %LEL
Pentane(C 5 H 12 ) 3 ~ 45 %LEL
Hexane(C 6 H 14 ) 7 ~ 28 %LEL
Ethane(C 2 H 6 ) 42 ~ 50 %LEL
Ethylene(C 2 H 4 ) 4 ~ 5 %LEL

G-Finder Multi (O
2
/ CO / H
2
S / CH
4
) Portable Multi Gas Detector
GT-079 907250 PAGE 13 of 14 Rev .0(2020.05. 8)
16. Manufacturer Information
If there are any problems with our products,
please contact us at the address below.
1) Address :
Gastron Co., Ltd. 23, Gunpocheomdansaneop
1-ro, Gunpo-si, Gyeonggi-do, Korea
2) Tel : [phone]
3) Fax : [phone]
4) URL : www.gastron.com
5) e-mail : [e-mail]
17. Certifications and Approvals
1) The certification marking and certificate
numbers are in the table below.
Product
Name
Specific Low Power adio Equipment
for Wireless Data Communication
Systems
Ex
marking
ATEX : II 1 G Ex ia IIC T4 Ga
IECEx / KCs / NEPSI : Ex ia IIC T4 Ga
Approvals
IECEx : IECEx KTL 19.0028X
KCs : 19-KA2BO-0915X
ATEX : DEK A 19ATE0132X
NEPSI : GYJ19. XXXX
KC : -C-G99-GFM-400
2) The product is in conformity with the
following standards:
IECEx : IEC 60079-0:2017, IEC 60079-11:2011
KCs : Announcement No. 2019-15 of Ministry
of Employment and Labor
ATEX : EN IEC 60079-0:2018, EN 60079-
11:2012
NEPSI : GB 3836.1-2010, GB 3836.4-2010,
GB 3836.20-2010
3) The product may be used in zones 0, 1 & 2
with flammable gases and vapors with
apparatus groups IIC and with temperature
classes T1, T2, T3, T4.
4) The product is only certified for use in ambient
temperature in the range -20℃ ≤ Ta ≤ +50℃
and should not be used outside this range.
5) With regard to explosion safety, it is not
necessary to check for correct operation.
6) The product contains non user-replaceable
parts and is not intended to be repaired by the
user. epair of the equipment is to be carried
out by the manufacturer, or their approved
agents, in accordance with the applicable
code of practice.
7) The certificate label is described as below.

G-Finder Multi (O
2
/ CO / H
2
S / CH
4
) Portable Multi Gas Detector
GT-079 907250 PAGE 14 of 14 Rev .0(2020.05. 8)
18. Ordering Information
Please put an order according to the model code
description below.
 GFM-400-X-Y-Z
- GFM-400 : standard model name
- *X : Flammable gas type
 *X : Option code (default, MM2.5
PP2.5) which can be selected when
ordering by user demand which is not
be a default for target gas, calibration
gas, and measurement range about
flammable gas. For the details about
options, please refer to the table
below. Other option codes except
default are options in the future.
Option
code
Target
Gas
Calibration
Gas
Meas rement
range, %vol
Defa lt
(blank)
CH
4
CH
4
0 ~ 5
MM2.5 CH
4
CH
4
0 2.5
MM100 CH
4
CH
4
0 100
MP1.5 CH
4
C
3
H
8
0 1.5
MP2.5 CH
4
C
3
H
8
0 2.5
PP1.5 C
3
H
8
C
3
H
8
0 1.5
PP2.5 C
3
H
8
C
3
H
8
0 2.5
- *Y : Ho sing body color
(Blank : Orange(defa lt), YE : yellow,
GN : green, VT : violet, BK: black, etc.)
 *Y : Option which does not affect
intrinsic safety. This option code is
needed at the order phrase for
different housing color. This option
code will not be printed on the
nameplate.
- *Z : Bl etooth Comm nication Availability
Blank : With Bl etooth option(defa lt),
(Reserved option code for the f t re)
19. Sales Information
This equipment may be operated in all EU members.
20. Revision History
REV. CONTENTS DATE
0. Initial Document 25 JUL 20 9
0.2 Certificate Updated 7 DEC 20 9
.0 Released 18 MAY 2020