NodeTalks G-Tag Series User manual

Smart Gas Detector
User Manual
E-mail: [e-mail]
Website: www.nodetalks.co.kr
Document No. : NDTUM-GTAG
Revision No. : 2.0
Date : 2022.03.08
Author : Dae-woong Kim
Approver : Kyoung-sik Moon

Smart Gas Detector / G-Tag *** 2
Table of Contents

1. Product Overview································································· 3
2. Product Specification··························································· 4
3. User Precautions ································································ 5
4. How to Use········································································ 6
4.1. Device Startup(Activation)············································ 6
4.2. Standby Mode······························································· 6
4.3. Detection Mode···························································· 6
4.4. Alarm Mode·································································· 7
5. Maintenance and Management·········································· 8
6. Product Nameplate······························································ 9
A. Warranty and Repair························································· 10
B. Certification Details···························································· 11
C. Smart Gas Sniffer Manual················································ 12
D. How to Calibrate Gas Density········································· 22
E. Self-Diagnosis Error Code·················································· 28

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1.
Product Overview
Thank you for purchasing G-Tag, the smart gas detector of
NodeTalks
Corp.
G-Tag is an ultra-compact/ultra-light portable gas detector that can
measure the concentration of oxygen(O2) and toxic gas(CO, H2S, etc.). This
product is an IoT device that focuses on securing safety and user
convenience in the industrial fields.
Main Features of G-Tag
Easy to carry and wear on any part of body since it is small and light
(“about 55g”).
“Continuous operation for 2 years” without charging or battery
replacement.
Convenient use since the dedicated app enables users to view the
results of detection and warning history at “Smartphone“. (using
beacon signal of BLE wireless communication)
In case of emergency, alert the user through the smartphone along
with product alarm, and automatically send the text message warning
for spreading the situation to the pre-registered coworkers and
managers so as to rapidly identify the accidents and to carry out
follow-up measures, resulting in reduction of ”suffocation accidents“.
Appearance
(Front)
* G-Tag 100 model does not include
CO/H2S (or other toxic gas) sensor.
(Back)
All G-Tag products include oxygen (O2) sensor by default(See the left
figure of the cover (page 1)). G-Tag 200~300 model additionally includes a
toxic gas sensor (CO, H2S, etc.), and this product line has 2 gas
measurement holes(see the right figure of cover (page 1) or the figure of
appearance (page 3)).

Smart Gas Detector / G-Tag *** 4
2.
Product Specification
* Type of gas that can be measured with the actual product may differ
depending on the G-Tag product model. Please check the product model
and type of measuring gas before use(See page 6)
Type of Gas Oxygen (O2)Carbon
monoxide(CO) Hydrogen sulfide (H2S)
Range of
measurement
[Resolution]
0 ~ 25% Vol
[0.1% Vol] 0 ~ 500 ppm [1 ppm] 0 ~ 100 ppm [0.1 ppm]
Type of Sensor Electro-chemical
Measuring
Principle Diffusion type
Response Time Within 30 seconds (T90)
Display &
Alarm Level Display: no (use smartphone app) / alarm level: 85 dB @ 10cm
Operating
Temperature Ta: - 20 ~ + 50℃
Humidity 10 ~ 90% relative humidity (without condensation)
Battery 3.6V Li-SOCl2 battery 1EA, non-replaceable. (XLP-050F, Xeno Energy or ER14250, EVE Energy Co., Ltd.)
Continuous
operation time
(device lifetime)
2 years (based on alarm operation for 2 minutes a day,
activation required within 3 months after purchase)
Size & Weight 75 mm(H) x 36 mm(W) x 14.6 mm(D)
/ 55g (including battery)
** Measurement range for other gas sensor
Type of Gas Range of measurement
[Resolution]
Chlorine (Cl2)
Nitrogen Dioxide (NO2)
Hydrogen Cyanide (HCN)
Nitric Oxide (NO)
Sulfur Dioxide (SO2)
: 0 ~ 20 ppm [0.1 ppm]
: 0 ~ 20 ppm [0.1 ppm]
: 0 ~ 50 ppm [0.1 ppm]
: 0 ~ 100 ppm [0.1 ppm]
: 0 ~ 20 ppm [0.1 ppm]

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3.
User Precautions
[ WARNING ]
DO NOT OPEN OR REPLACE BATTERY WHEN EXPLOSIVE ATMOSPHERE IS PRESENT.
POTENTIAL ELECTROSTATIC CHARGING HAZARD CLEANING SHALL BE DONE WITH –
A DAMP CLOTH.
Warning
When operating the gas detector for the first time, or turning it on
again after not using it for a long period of time, it takes a few
minutes for stabilization until it indicates accurate results. (turn on the
product in the clean atmospheric environment without harmful gas)
Do not use this product for gas measurement or as gas analyzer since
it is a detection and alarm device. In addition, since it is a portable
device, we are not responsible for any problem that may occur if it is
used as a fixed or mobile device.
Arbitrary dissembling of products or replacement of parts may cause
detrimental damage on the products. Direct touch of internal circuit
may cause static electricity, resulting in circuit damage. Contact
NodeTalks Corp.. if the sensor or the battery require replacement.
Do not power off the products(for a long time) since this product
carries out automatic calibration of the gas sensor. It is recommended
to keep the gas detector in a safe place with the power on when not
in use.
 Improper handling or use of the product may cause reduction of the
service life or inaccurate gas detection. (Example of improper handling:
storage near hot, flammable or toxic substance, soaking in the water or
impact on the product case or gas measurement hole, etc.)
This product has been manufactured without its display and you can
check the detection results of oxygen and toxic gas using “Smart Gas
Sniffer”, the dedicated Bluetooth application(hereinafter dedicated app)
at your smartphone. You can download the dedicated app at Google
PlayStore or Apple AppStore for free. Be sure to download it in a safe
place(explosion-proof area).
This product operates as a stand-alone gas alarm and gives an alarm
according to situation in case of gas deficiency or gas leakage. Be sure
to keep the dedicated app of the smartphone running when
wearing(using) this product in order to grasp the situation quickly in
case of emergency and to automatically respond to it.
Some functions such as sending situation message may be restricted in
the shielded places where incoming and outgoing call of smartphone is
not possible.
Various functions implemented through the smartphone may be lost if
distance between this product and smartphone is so far that Bluetooth
signal cannot reach. Use it only within the communication distance
between the devices, and check the normal operation of app.

Smart Gas Detector / G-Tag *** 6
Specific Conditions of use:※
i. The equipment is a hand-held & portable device. Where a static-generating
mechanism is identified, such as repeated brushing against clothing, then suitable
precautions shall be taken, e.g. the use of anti-static footwear.
ii. As aluminum is used at this equipment, ignition sources due to impact and
friction sparks could occur, this shall be taken into account when the requirement
is used in zone 0 location.
iii. Only the ER14250 lithium thionyl chloride battery manufactured by EVE Energy
or XLP-050F lithium chionyl chloride battery made by XENO Energy shall be used.
The battery shall not be replaced when an explosive atmosphere ie present.
4.
How to Use
Check the product model and gas for measurement before using G-Tag.
You can check the product model at the name plate or package case.
< Type of G-Tag Product >
Model Name Gas for Measurement
G-Tag 100 : Oxygen (O2)
G-Tag 200 : Oxygen (O2) / Carbon monoxide (CO)
G-Tag 210 : Oxygen (O2) / Hydrogen sulfide (H2S)
G-Tag 220 : Oxygen (O2) / Chlorine (Cl2)
G-Tag 230 : Oxygen (O2) / Nitrogen Dioxide (NO2)
G-Tag 240 : Oxygen (O2) / Hydrogen Cyanide (HCN)
G-Tag 250 : Oxygen (O2) / Nitric Oxide (NO)
G-Tag 260 : Oxygen (O2) / Sulfur Dioxide (SO2)
G-Tag 300 : Oxygen (O2) / Carbon monoxide (CO) / Hydrogen sulfide (H2S)
4.1. Device Startup (Activation)
Press the button for about 3 seconds to turn on the power(Blue LED on).
Release the button when red LED turns on with startup alarm sound. After
that, red LED will blink in the interval of 3 seconds and normal operation will
start.
Press the button for about 10 seconds to turn off the power(Blue LED turns
on). The product power is cut off with shutdown alarm sound. (Power
shutdown is not recommended unless there is a special purpose such as
calibration.)
4.2. Standby Mode
Right after the power is on, G-Tag operates in Stand-by mode.
In the standby mode, G-Tag does not operate as a gas detector and performs
internal error diagnosis and sensor stabilization.

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When stabilization is over, the standby mode automatically exists and G-Tag
enters the detection mode.
When span calibration or firmware update is required, it is performed in this
standby mode.(See “Appendix D” of this manual for details. )
[LED Operation Pattern]: red LED blinks in the interval of 3 seconds
4.3. Detection Mode
In Detection mode, G-Tag operates as a gas detector.
To check the concentration of detection, turn on the Bluetooth function of
smartphone and run the dedicated app.
When the concentration of gas is beyond the certain level, G-Tag triggers the
alarm. If the dedicated app is on, alarm also works on the dedicated app.
See Clause 4.4 on page 7 for criteria of alarm triggering and operation
pattern.
[LED Operation Pattern]: Green LED blinks every 3 seconds(Red LED blinks in case
of alarm)
4.4. Alarm Mode
Red LED blinks according to the buzzer pattern in Alarm Mode.
In case of A1/A2 alarm, press the button to temporarily turn off the buzzer
sound. If the concentration of gas returns to the normal value, the alarm is
automatically terminated.
TWA (8 hour cumulative concentration) and STEL (15 minute cumulative
concentration) value are defined for concentration of toxic gas (CO or H2S).
Use the dedicated app to turn off the alarm. See the user’s manual of
dedicated app for details.
Alarm
Type
Criteria of alarms
Buzzer Pattern
O2CO H2S
A1 30 ppm 10 ppm 1 time per second
(On-Time: 300 ms)
A2 Less than 19.5% or
greater than 23.5% 60 ppm 20 ppm 2 times per second
TWA 30 ppm 10 ppm 1 time per second
(On-Time: 600 ms)
STEL 200 ppm 15 ppm 4 times per second
* Vibration motor pattern: operate 2 times per second at the interval of 5
seconds (common)
** Please contact to manufacturer (NodeTalks Corp.) if the criteria of other toxic
gas (not specified above table, such as NO, SO2) is required.

Smart Gas Detector / G-Tag *** 8
Recommended Usage:
”Be sure to“ check the LED pattern before using the product to see whether
the G-Tag operates in detection mode(Green LED blinks). If there is no
separate operation, G-Tag operates in the detection mode and measures the
concentration of gas in real time.
Since this product can be operated ”continuously for 2 years“ and performs
long-time automatic calibration of the oxygen sensor, it is recommended to
keep G-Tag with power on in a safe place when not in use.
Since this product does not require ”battery replacement or charging“, you can
wear this on ”safety helmet, clothes and equipment“ using the accessory clip
provided with this product and always carry the gas detector in the working
environment.
In case of an alarm, respond to the situation properly such as evacuation
from the relevant place in order to prevent suffocation.
Notice that the gas sensors used in the product have a life expectancy of “2
years”, apart from the life expectancy of product (battery).
Cautions on Performance of Gas Detector:※
Refer to “Product Specification” page and use this product within the
recommended temperature, humidity and air pressure.
Results of detection may be inaccurate in the “environment” where
temperature, humidity or air pressure rapidly change. Adapt to the
environment and use after the indication of the gas concentration is stabilized.
Do not use in “high-concentration environment” or for the gas beyond
measurement scope when detecting the concentration of gas. This may shorten
the service life of gas sensor inside the product and require additional
calibration.
Do not use this product near the place where “strong electromagnetic waves”
exist (ex: base station). It may cause an error in the results of gas detection,
connection with or operation of smartphone.

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5.
Maintenance and Management
Storage
It is recommended to keep the power on when storing the product after
activation and to store in the clean and safe place.
Keep the area around the measurement hole of gas sensor clean.
Calibration
It is recommended to perform calibration every 6 months after start-up
(activation).
Calibration is conducted using the dedicated app and test gas of specific
concentration is required.
See “Appendix D” of this manual for the calibration process.
Clip Replacement
See the following figure when replacing the rear clip.
Clips are provided such as general clips or safety helmet clips.
<Replacement of General Cli> <Replacement of Safety Helmet Clip>

Smart Gas Detector / G-Tag *** 10
6.
Product Name Plate
Product Nameplate
Nameplate of this product is attached on the rear side (refer to figure on
page 3) of the product as shown below, and it contains the following
informations: product model, certification mark and number, manufacturer,
serial number, etc.
Products shipped to North America have the nameplate with QPS certification
mark, explosion-proof information and warning text in English and French is
attached instead of the one in above figure.
Example of Nameplate of Products ◀
Shipped to North America

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A. Warranty and Repair
NodeTalks Corp. guarantees the quality of the product for 1 year from the
date of shipment after product purchase. This means that there is no problem in
the function and components of the products if the customers uses the products
normally by complying with the precautions indicated in this user manual and
that free A/S is provided for any defective product during the warranty period.
This warranty applies to the product purchaser only and not to the products
purchased through any route other than the headquarter or official distributors. In
addition, the warranty is limited to the replacement of products or parts, repair
of product defects. See the following notes for details on quality warranty.
We may request the purchaser to provide evidence materials to confirm
whether the product is within the warranty period. If relevant information is
not confirmed, free service may not be provided.
The user should bear the cost for the repair of the product defect or damage
occurred due to negligence of user even during the warranty period.
The user should bear the cost for repair of products or replacement of parts
after warranty period in principle.
We are not held responsible for any damage of customers caused by toxic gas
leakage, suffocation or various accidents not directly attributable to this
product while using this product.
We are not held responsible for any problems caused by improper handling,
misuse or negligence of the purchaser (or a 3rd party).
*If you suspect product malfunction or require repair, please contact us.
Website: www.nodetalks.co.kr
inquiry: [e-mail]

Smart Gas Detector / G-Tag *** 12
B. Certification Details
G-Tag, our smart gas detector, has obtained domestic/foreign explosion-proof
certification for intrinsic safety and complies with the following standards.
IEC 60079-0:2017
IEC 60079-11:2011
EN IEC 60079-0:2018
EN 60079-11:2012
CAN/CSA C22.2 No. 60079-0:2019
CAN/CSA C22.2 No. 60079-11:2014
CSA C22.2 No. 61010-1-12:2012
ANSI/UL 60079-0 (7th Edition)
ANSI/UL 60079-11 (6th Edition)
ANSI/UL 61010-1 (3rd Edition)
IP Protection Degree: IP 67
KCs (• KTL 21-KA2BO-0047X) KC (• R-R-N54-G-TAG)
Ex ia IIC T4
Ta: 20 ~ 50− ℃
ATEX (KSC ATEX0002X)•
2877
Ta: 20 ~ 50− ℃
Directive 2014/34/EU
IECEx (IECEx KSCP 22.0012X)•
Ex ia IIC T4 Ga
Ta: 20 ~ 50− ℃
UL (LR 1657-1)•
INSTRINSICALLY SAFE/ SÉCURITÉ INTRINSÈQUE
Class I, Zone 0, AEx ia IIC T4 Ga;
/QPS (UL) certificate currently inactivated.
Please contact us for details about using the product in North America region.

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C. Smart Gas Sniffer Manual
C.1 Install Smart Gas Sniffer
Install the smart gas sniffer app(hereinafter “dedicated app”) on your smartphone in
advance in order to check the detection results of G-Tag, our smart gas detector.
Android: launch Google PlayStore and then search for “Smart Gas Sniffer.” After
selecting the app, press the “Install” button to start downloading.
iOS: launch AppStore and then search for “Smart Gas Sniffer“. Press the “Get” button
to download the app, and then press the “Install” button to install the app.
Cautions
Be sure to allow location access permission when installing the app, in order to
use the Smart Gas Sniffer app normally. Ignoring this process may result in
malfunction of emergency contact and alarm location check provided by the app
other than detection of gas concentration. We are not responsible for any
problems caused by such negligence.
If you do not accept the location access, file access permission, terms and
conditions of dedicated app, you cannot use this app. (See C.2 Allow Permission
and Accept Terms and Conditions).
The latest model phone(Android 10 or over, as of Feb. 2021) may request the
drawing permission over other app. If you do not accept the permission, you
may not use the app normally.
If you do not enter the phone number actually used in the process of agreement
and authentication, there may be restriction on use of app. We are not
responsible for any problem caused by this(It may take up to 1 minute to
receive verification text message.)
This manual is prepared based on Android Smartphone. All the functions indicated
in the manual may not be guaranteed in iPhone. We are not responsible for any
problems that may occur due to functional difference between OS of Android and
iPhone.
Detailed structure and function of this dedicated app is subject to change without
prior notice.
Operating System(OS) for Smart Gas Sniffer App
- Android OS: 5 or over
- iOS: 11.0 or over (* iPhone 5 or over supported)

Smart Gas Detector / G-Tag *** 14
C.2 Allow Permission and Accept Terms and Conditions
The following figures show the permission screens that appear when you first run
the app after installing it. Press the “OK” button and then “Allow” the file access
permission and location access permission.
The figure on the top of the next page (p. 15) shows the screen for agreement of
terms and conditions for app use. Press “View” button to check the details of each
item. After checking all the contents of each item, tick the ‘I have read all the main
contents, warnings and cautions.’ checkbox, press “Agree” button that becomes activated
to agree each.
Press the “Agree” button on the bottom that becomes activated when you agree to all
the contents on the Agreement of Terms and Conditions to go to the next page. After
entering the name, nationality and phone number of the user, press ‘Send Verification
Number’ button and 6 digit verification number will be sent to the device of the user.
After entering the verification number received, press the “Confirm Verification” button
and then basic preparation for agreement of terms and conditions and the app use is
completed.

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C.3 Basic Method of Using App
Run the app while G-Tag is normally turned on, and the basic screen appears as
shown below. concentration indication will blink during normal operation whenever
receiving the data.
NOTE::
Smart gas sniffer app does not require separate connection(pairing) process with
G-Tag.
Detection results of G-Tag are displayed at the center of the screen and the
measurement gas will be automatically displayed according to G-Tag model.
Strength of wireless connection to G-Tag and remaining batter level are displayed on
the right upper part.

Smart Gas Detector / G-Tag *** 16
If the app is running, the text indicating the app running status is displayed in the
notification area at the top of the smartphone (figure on the bottom left). To show the
information rapidly in case of alarm, the app will not be terminated even if you click
the Back button. Press the home(center) button of the smartphone to switch the app to
the background model.
The antenna on the upper right displays the strength of wireless connection with G-Tag.
X mark will appear if the connection strength becomes weakened and it is a temporary
phenomenon. If X mark continues and indicates “Disconnected from G-Tag. Please check
the operation status and distance of the device.” at the center of the screen, check the
distance with the device first and examine whether G-Tag is turned on or Bluetooth is
turned on. Once connected, the concentration indication will blink whenever receiving
data from G-Tag.
The volume of media sound is changed to the maximum whenever the app is launched
so that the user can identify the alarm even in the poor surroundings(Figure on the
right part of page 15). (the volume can be freely adjusted after running the app).

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C.4 App Operation in case of Alarm
When receiving warning concentration from G-Tag, the dedicated app notifies the
user of the danger by vibration along with its own alarm sound through the
smartphone. Detection result will be displayed in green in normal situation; in orange in
warning situation; and red in dangerous situation(Figure on upper left part of page 18).
A text “Please ventilate or leave the current location” is displayed when entering the
dangerous situation or in case of warning. If the app operates in the background, the
dedicated app screen appears along with the indication text on the upper part of the
app(figure on the upper center part of page 18).
If there exists strong electromagnetic waves such as base station at a close range, it
causes malfunction of the gas detector, resulting in rapid increase and abnormal
variation of all values(figure on the upper right part of page 18). In this case, leave the
location and it will return to normal operation again.
Cautions
Turn on the Bluetooth function of the smartphone before using the app.
If you run the app while Bluetooth is off, it requests the permission for
Bluetooth function and sets it to turn on Bluetooth with ‘Use’ button.
If use of Bluetooth is not allowed, data of G-Tag cannot be received.
It is recommended to run the app after switching the location information of
smartphone to “Enable”. If this function is not enabled, it switches to the page
for activation of location information in the stage of running app.
The same information is displayed to the app user within the transmission
distance of G-Tag. (as the feature of beacon method, information sent from 1
unit of G-Tag can be checked simultaneously by multiple app users.)
If there exist several units of G-Tag around the user, information from several
units of G-Tag may be displayed in turns. However, when alarm occurs from
G-Tag possessed by the user, only user’s information is displayed first so that
there is less risk of confusion with information from nearby G-Tag in case of
emergency.
Communication distance between G-Tag and smartphone may vary depending on
surrounding environment. Communication status can be checked through
indication of concentration that blinks at certain time and strength of wireless
connection of the app.

Smart Gas Detector / G-Tag *** 18
If a recipient is added in the emergency contact network, it automatically notifies of the
dangerous situation of the app user by text message. concentration of gas currently
exposed, name, phone number and location information of app user is sent to the
contact of the recipient saved earlier.
- In case of A1/A2 alarm, the color is changed according to the degree of danger of
gas and a button [ ] appears on the lower right part, which enables to turn off the
alarm sound of the app temporarily (60 seconds). Press the button to turn off the
alarm temporarily and to use normal function of smartphone. For example, you can
scroll down the app(click home button) and use the call function to alert you about
dangerous situation. (In general, if the app is turned on and activated, it will forcefully
switch to the dedicated app screen and to restrict conversion to other app when
dangerous situation occurs. )
- However, alarm sound will operate again regardless of standby time of 60 seconds if
A2 alarm is generated even if you turn off the alarm sound in A1 situation.
- If A2 alarm occurs simultaneously in over 2 sensors including the oxygen sensor, text
“malfunction due to strong electromagnetic waves” may be added, assuming that it is
exposed to strong electromagnetic waves.(See the figure on the upper right part)
- As shown in the figure on the upper part of page 19, it displays the gas of which
warning concentration occurs in the situation of time-weighted average exposure
alarm(TWA or STEL), and separately displays type of alarm(see the figure on the upper
left part of page 19). You can temporarily turn off the time-weighted average exposure
alarm for 60 seconds using the button on the lower left in the dedicated app, but
alarm of G-Tag is not released before it leaves the gas leakage area.

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NOTE::
If the gas detection concentration value is out of measurement range, it is replaced
with OVER text (refer to Figure on the upper of the page 18).
If there is no recipient registered in the emergency contact network, danger text is
not sent. In this case, a text “Failed to bring the emergency contact network. Please
register the emergency contact network” is displayed at the center of the app.
Cautions
If the relevant toxic gas is exposed while time-weighted average exposure
concentration exceeds the thresholds, TWA or STEL alarm will sound. (Ex: if
detecting CO2 gas over 30ppm actually while the cumulative concentration value
of CO gas for 8 hour is 200 ppm, TWA alarm will operate instead of A1 alarm)
If TWA or STEL alarm occurs, the relevant alarm cannot be turned off with the
button of G-Tag. If the cumulative concentration value falls below the threshold,
evacuate to the area with good ventilation and clean air.
If the user does not move for over 30 seconds while alarm continues to occur
in G-Tag(if possessing the smartphone with dedicated app running), it considers
the user to be in dangerous situation and continues to send warning text to
the recipients saved in the emergency contact network every 30 seconds to ask
for help.
Since a text is sent to the recipient to notify safe situation if you press
“Notification of release of dangerous situation” button that is displayed on the
screen when the alarm occurs, use it properly after “dangerous situation is
solved clearly”.

Smart Gas Detector / G-Tag *** 20
C.5 Other Functions
C.5.1 Register Network of Emergency Contact
You can register or delete the targets to send a danger text when receiving
warning alarm in the emergency contact network of the dedicated app. Click the
contact in the address book and then click the Register button that appears on the
lower right, the relevant recipient will be registered in the emergency contact network
(left figure). You can check the address book saved in the smartphone by allowing the
contact access permission(access) of the dedicated app.
If you want to newly add a person who is not in the contact , click “Add New
Contact’ button on the lower part of app to register the name and phone
number(Right figure). If you want to delete the person added in the emergency contact
network, click the x mark on the right to delete.
C.5.2 Check Warning History
You can check the alarm data such as date of occurrence, concentration of gas and
location received from G-Tag. In addition, if the serial number of device is checked, the
serial number is also displayed so that you can check which device the alarm sounds
from. If there is no alarm received for the day, a text “No data. Please select a date”
is displayed.