Riken Keiki GX-3R Pro User manual

PT0E-1773
Portable Gas Monitor
GX-3R Pro
Operating Manual
(PT0-165)
2-7-6 Azusawa, Itabashi-ku, Tokyo, 174-8744, Japan
Phone : [phone]
Fax : [phone]
E-mail : [e-mail]
Web site : http://www.rikenkeiki.co.jp/

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Contents
1 Product Overview ............................................................................................................................................ 5
1-1. Introduction ............................................................................................................................................ 5
1-2. Intended use .......................................................................................................................................... 5
1-3. Checking the detection target gases ..................................................................................................... 6
1-4. DANGER, WARNING, CAUTION, and NOTE ....................................................................................... 7
1-5. Checking standards and explosion-proof specifications ....................................................................... 7
2 Important Safety Information ........................................................................................................................... 8
2-1. Important notice about TIIS specification .............................................................................................. 8
2-2. Warning information ............................................................................................................................. 10
2-3. Caution information .............................................................................................................................. 11
2-4. Safety information on ATEX/IECEx specifications ............................................................................... 13
3 Product Configuration .................................................................................................................................... 14
3-1. Main unit and standard accessories .................................................................................................... 14
Main unit .............................................................................................................................................. 14
Standard accessories .......................................................................................................................... 15
3-2. Part names and functions .................................................................................................................... 16
Main unit .............................................................................................................................................. 16
Battery unit .......................................................................................................................................... 17
LCD display ......................................................................................................................................... 18
4 Alarm Activation ............................................................................................................................................. 19
4-1. Gas alarm activation ............................................................................................................................ 19
4-2. Fault alarm activation ........................................................................................................................... 22
4-3. Panic alarm .......................................................................................................................................... 23
Panic alarm buzzer sounding and lamp flashing patterns .................................................................. 23
Panic alarm activation and alarm pattern ........................................................................................... 23
4-4. Man down alarm ................................................................................................................................... 24
Man down alarm buzzer sounding and lamp flashing patterns .......................................................... 24
Man down alarm display and alarm patterns ...................................................................................... 24
5 Usage Instructions ......................................................................................................................................... 25
5-1. Before using the product ...................................................................................................................... 25
5-2. Preparing startup ................................................................................................................................. 25
5-2-1. Charging and attaching the lithium ion battery unit (BUL-3R) ................................................. 25
5-2-2. Attaching the dry battery unit (BUD-3R) ................................................................................... 28
5-3. Startup .................................................................................................................................................. 30
Turning on the power .......................................................................................................................... 30
Screen transition from powering on to displaying measurement screen ........................................... 31
5-4. Air calibration ........................................................................................................................................ 33
Air calibration procedure ..................................................................................................................... 33
5-5. Gas detection ....................................................................................................................................... 34
5-5-1. Basic operating procedures ...................................................................................................... 34
5-5-2. Measurement mode .................................................................................................................. 35
5-6. Turning off the power ........................................................................................................................... 37
6 Setting Procedure .......................................................................................................................................... 38
6-1. Display mode ....................................................................................................................................... 38
6-1-1. Displaying display mode ........................................................................................................... 38
6-1-2. Display mode display details .................................................................................................... 38
6-2. Display mode settings .......................................................................................................................... 41
6-2-1. Clearing PEAK value display .................................................................................................... 41
6-2-2. Combustible conversion gas selection ..................................................................................... 42
6-2-3. Long-life battery setting ............................................................................................................ 44
6-2-4. Calibration data display ............................................................................................................ 45
6-2-5. Bump data display .................................................................................................................... 46
6-2-6. Alarm setpoint display ............................................................................................................... 47

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6-2-7. LCD inversion setting ............................................................................................................... 48
6-2-8. LCD background setting ........................................................................................................... 49
6-2-9. Bluetooth setting ....................................................................................................................... 49
6-2-10. Buzzer volume adjustment ..................................................................................................... 50
6-2-11. Display language setting ......................................................................................................... 50
6-3. User mode ............................................................................................................................................ 52
6-3-1. Displaying user mode ............................................................................................................... 52
6-3-2. User mode settings ................................................................................................................... 53
6-4. User mode settings .............................................................................................................................. 54
6-4-1. Bump test .................................................................................................................................. 54
6-4-2. Calibration ................................................................................................................................. 54
6-4-3. Calibration expiration date setting ............................................................................................ 54
6-4-4. Bump test setting ...................................................................................................................... 57
6-4-5. Man down alarm setting ........................................................................................................... 62
6-4-6. Alarm setpoint setting ............................................................................................................... 64
6-4-7. Lunch break: ON/OFF .............................................................................................................. 66
6-4-8. Confirmation beep setting ........................................................................................................ 66
6-4-9. Automatic backlight: ON/OFF ................................................................................................... 68
6-4-10. Backlight lighting time setting ................................................................................................. 68
6-4-11. Key tone: ON/OFF .................................................................................................................. 69
6-4-12. Display mode item display: ON/OFF ...................................................................................... 69
6-4-13. CO2 sensor unit selection ....................................................................................................... 7 0
6-4-14. CO2 sensor air calibration: ON/OFF ....................................................................................... 70
6-4-15. Date and time setting .............................................................................................................. 71
6-4-16. Date format setting ................................................................................................................. 71
6-4-17. Language setting .................................................................................................................... 72
6-4-18. User password setting ............................................................................................................ 73
6-4-19. ROM/SUM display .................................................................................................................. 74
6-4-20. Bluetooth authentication display ............................................................................................ 74
7 Maintenance .................................................................................................................................................. 75
7-1. Maintenance intervals and maintenance items ................................................................................... 75
Maintenance service ........................................................................................................................... 76
7-2. Calibration ............................................................................................................................................ 77
7-2-1. Preparation for calibration ........................................................................................................ 77
7-2-2. Calibration setting menu ........................................................................................................... 79
7-2-3. Air calibration ............................................................................................................................ 80
7-2-4. CO2 zero calibration ................................................................................................................. 82
7-2-5. Auto calibration ......................................................................................................................... 83
7-2-6. Auto calibration cylinder setting ................................................................................................ 84
7-2-7. Auto calibration gas concentration selection ............................................................................ 85
7-3. Bump test ............................................................................................................................................. 86
7-5. Parts replacement ................................................................................................................................ 88
7-5-1. Periodic replacement parts ....................................................................................................... 88
7-5-2. Filter replacement ..................................................................................................................... 89
8 Storage and Disposal .................................................................................................................................... 91
8-1. Procedures for storage or when not in use for extended periods ....................................................... 91
8-2. Procedures for use after storage ......................................................................................................... 92
8-3. Product disposal................................................................................................................................... 92
9 Troubleshooting ............................................................................................................................................. 93
9-1. Product abnormalities .......................................................................................................................... 93
9-2. Reading abnormalities ......................................................................................................................... 95
10 Product Specifications ................................................................................................................................. 96
10-1. Specifications list ............................................................................................................................... 96
10-2. Accessory list ................................................................................................................................... 100
11 Appendix .................................................................................................................................................... 102
Data logger function .................................................................................................................................. 102

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100 %LEL = ppm conversion list ............................................................................................................... 104
Revision History ........................................................................................................................................ 105
Declaration of conformity .......................................................................................................................... 106

1 Product Overview 1-1. Introduction
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1
1 Product Overview
1-1. Introduction
Thank you for your purchase of the GX-3R Pro Portable Gas Monitor (“product” hereinafter). First, confirm
that the model number of the product you purchased matches the model number of the product covered by
this manual.
The product should be used only by fully-trained personnel.
The maintenance procedures described in this manual should be performed only by fully-trained personnel.
Any maintenance procedure not described in this manual must be performed by Riken Keiki or our certified
service engineers. Please contact Riken Keiki.
This manual describes how to use the product and provides product specifications. Make sure you have read
and fully understand the contents of this manual before using the product. This applies both to first-time users
and those who have previously used the product.
Keep this manual in a safe place for future reference.
The contents of this manual are subject to change without notice to allow product improvements. Any
duplication or reproduction of this manual without permission is prohibited, whether in whole or in part.
In addition to this manual, manuals are also provided for optional products (sold separately). Refer to the
following manuals along with this manual when using optional products (sold separately):
1) RP-3R Pump Unit Operating Manual (PT0E-166)
2) SW-GX-3R Data Logger Management Program Software Operating Manual (PT0E-178)
3) SDM-3R Docking Station Operating Manual (PT0E-167)
Regardless of the warranty period, Riken Keiki does not accept any liability for accidents or damage resulting
from use of the product.
Be sure to read the warranty policy set forth on the warranty.
1-2. Intended use
The product is a multi-gas monitor equipped with up to four types of sensors to enable detection of five
different gas types using a single unit.
The detection target gases vary depending on the particular sensors installed in the product. Check the
detection target gases before use to confirm the correct gases will be detected in accordance with the
intended purpose.
The product is a gas detector designed to measure the concentrations of chemicals in the air in working
environments. It measures concentrations of toxic gases, combustible gases, and oxygen to which it is
exposed and issues an alarm if concentrations exceed preset levels, thereby alerting users to the hazards of
gas poisoning and oxygen deficiency.

1 Product Overview 1-3. Checking the detection target gases
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1-3. Checking the detection target gases
The combination of detection target gases will vary depending on the particular sensors installed in the
product.
Check the detection target gases on the nameplate attached to the rear of the product before use.
The detection target gases can be checked via the product code.
<Sensor>
Position Spec. Sensor model Symbol
 Combustible gas (HC or CH4) sensor
NCR-6309 H: Installed (HC)
NCR-6309 M: Installed (CH4)
- 0: Not installed
 Oxygen (O2) sensor ESR-X13P 1: Installed
0: Not installed

Carbon monoxide/hydrogen sulfide
(CO/H2S) sensor ESR-A1DP E1
Carbon monoxide (CO) sensor* ESR-A1CP E2
Sulfur dioxide (SO2) sensor ESR-A13D E3
Hydrogen sulfide (H2S) sensor ESR-A13i E4
Carbon monoxide (CO) sensor ESR-A13P E5

Sulfur dioxide (SO2) sensor ESR-A13D E3
Hydrogen sulfide (H2S) sensor ESR-A13i E4
Carbon dioxide (CO2) <vol%> sensor IRR-0409 D1
Carbon dioxide (CO2) <ppm> sensor IRR-0433 D2
- - 00
<Battery unit>
Position Spec. Battery
unit model Symbol
 Lithium ion battery BUL-3R L
Alkaline battery BUD-3R D
<BLE function>
Position Spec. Symbol
 BLE supported 1
BLE unsupported 0
* The carbon monoxide sensor (ESR-A1CP) includes a correction function to reduce interference due to
hydrogen.
This function works for hydrogen concentrations up to 2,000 ppm.
Rear
(Fixed)

1 Product Overview 1-4. DANGER, WARNING, CAUTION, and NOTE
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1-4. DANGER, WARNING, CAUTION, and NOTE
This manual uses the following headings to ensure safe and effective work:
DANGER
This indicates situations in which improper handling may result in fatal or
serious injury to persons or serious damage to property.
WARNING
This indicates situations in which improper handling may result in serious
injury to persons or serious damage to property.
CAUTION
This indicates situations in which improper handling may result in minor
injury to persons or minor damage to property.
NOTE This indicates handling tips.
1-5. Checking standards and explosion-proof
specifications
The product specifications will vary depending on the specific standards and explosion-proof certification.
Check the actual product specifications before use. For CE marking models, refer to the “Declaration of
Conformity” in the Appendix.
Check the affixed nameplate for product specifications.
TIIS type name plate ATEX/IECEx,CE marking type name plate
Type
examination
certificate
marking
Ex marking
CE marking

2 Important Safety Information 2-1. Important notice about TIIS specification
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2
2 Important Safety
Information
To maintain the performance of the product and to ensure safe use, always observe the following DANGER,
WARNING, and CAUTION instructions.
2-1. Important notice about TIIS specification
DANGER
Explosion-proofing
Main unit explosion-proofing
 Do not modify or alter the circuitry or configuration.
 When measuring oxygen concentrations, do not measure anything
but mixtures of air and combustible or toxic gases.
Do not use the oxygen sensor (on models with the oxygen sensor
installed) to detect leaks of combustible or toxic gases.
 When using the product in hazardous areas, take the following
precautions to safeguard against static electricity hazards:
① Wear anti-static clothing and conductive shoes (anti-static work
shoes).
② When using the product indoors, stand on a conductive work floor (with a leakage resistance of
10 MΩ or less).
 The battery unit that can be connected is the BUL-3R (certificate number DEK18.0017) or BUD-3R
(certificate number DEK18.0018).
 The ratings for the main unit are as follows:
Buzzer circuit: Allowable voltage 4.2 V, allowable current 0.556 A, allowable power 0.379 W
Main circuit: Allowable voltage 5.4 V, allowable current 1.206 A, allowable power 0.825 W
Motor circuit: Allowable voltage 4.2 V, allowable current 0.152 A, allowable power 0.124 W
ECRI circuit: Allowable voltage 5.4 V, allowable current 1.222 A, allowable power 0.866 W
Ambient temperature: -40 °C to +60 °C
(Ambient temperature refers to the temperature range in which explosion-proof performance can be
maintained. It does not refer to the temperature range in which product performance is guaranteed.
For the range of operating temperatures, see “10-1. Specifications list”.)
 The explosion-proof class of the main unit is Ex ia IIC T4 Ga.
 The main unit conforms to the following explosion-proofing guidelines:
Recommended Practices for Explosion-Protected Electrical Installations in General Industries
JNIOSH-TR-46-1 and 6: 2015
Main unit Battery unit

2 Important Safety Information 2-1. Important notice about TIIS specification
- 9 -
DANGER
Explosion-proofing
Battery unit explosion-proofing
 Do not modify or alter the circuitry or configuration.
When using the product in hazardous areas, take the following precautions to safeguard against
static electricity hazards:
① Wear anti-static clothing and conductive shoes (anti-static work shoes).
② When using the product indoors, stand on a conductive work floor (with a leakage resistance of
10 MΩ or less).
 The main unit that can be connected is the GX-3R Pro (certificate number DEK18.0016).
 The ratings for the BUL-3R lithium ion battery unit are as follows:
Buzzer circuit: Allowable voltage 4.2 V, allowable current 0.259 A, allowable power 0.272 W
Main circuit: Allowable voltage 4.2 V, allowable current 0.786 A, allowable power 0.825 W
Motor circuit: Allowable voltage 4.2 V, allowable current 0.118 A, allowable power 0.124 W
ECRI circuit: Allowable voltage 4.2 V, allowable current 0.825 A, allowable power 0.866 W
Battery charging contact allowable voltage: 6.3 V DC (with SELV power supply only)
Ambient temperature: -40 °C to +60 °C
(Ambient temperature refers to the temperature range in which the explosion-proof performance
can be maintained. It does not refer to the temperature range in which product performance is
guaranteed. For the range of operating temperatures, see “10-1. Specifications list”.)
 The explosion-proof class of the BUL-3R lithium ion battery unit is Ex ia IIC T4.
 The ratings for the BUD-3R dry battery unit are as follows:
Buzzer circuit: Maximum voltage 3.3 V, maximum current 0.556 A, maximum power 0.379 W
Main circuit: Maximum voltage 5.4 V, maximum current 1.206 A, maximum power 0.822 W
Motor circuit: Maximum voltage 3.3 V, maximum current 0.152 A, maximum power 0.104 W
ECRI circuit: Maximum voltage 5.4 V, maximum current 1.222 A, maximum power 0.833 W
Power supply: 3.0 V DC, 250 mA (Toshiba LR03 battery × 2)
Ambient temperature: -40 °C to +60 °C
(Ambient temperature refers to the temperature range in which the explosion-proof performance
can be maintained. It does not refer to the temperature range in which product performance is
guaranteed. For the range of operating temperatures, see “10-1. Specifications list”.)
 The explosion-proof class of the BUD-3R dry battery unit is Ex ia IIC T4 Ga.
 The main unit conforms to the following explosion-proofing guidelines:
Recommended Practices for Explosion-Protected Electrical Installations in General Industries
JNIOSH-TR-46-1 and 6: 2015
Usage
 If measuring inside manholes or enclosed spaces, never lean over or look into the manhole or
enclosed space. There is a danger that oxygen-deficient air or other gases may be discharged from
such locations.
WARNING
 If an abnormality is discovered in the product, contact Riken Keiki immediately. Visit our website for
information on the nearest Riken Keiki office.
Website: http://www.rikenkeiki.co.jp/

2 Important Safety Information 2-2. Warning information
- 10 -
2-2. Warning information
WARNING
Sensor handling
 Do not attempt to disassemble the electrochemical type sensor inside the product. Electrolyte
contained inside may cause inflammation if it comes into contact with the skin. There is also a risk
of blindness if it comes into contact with the eyes. Electrolyte may discolor or decompose clothing if
it comes into contact with clothing. If contact occurs, rinse the area immediately with plenty of water.
Do not use any gas other than nitrogen as the balance gas when calibrating or adjusting an oxygen
sensor.
Fresh air adjustment in the atmosphere
 When fresh air adjustment is performed in the atmosphere, check the atmosphere for freshness
before starting. The presence of interference gases will make it impossible to adjust the product
correctly, resulting in the danger of erroneous detection when actual gas leaks occur.
Action when a gas alarm occurs
 When a gas alarm occurs, this indicates an extremely dangerous situation. The user must take
appropriate action after taking steps to ensure safety.
Panic alarm and man down alarm
 The panic and man down alarms are intended to assist the user and those in the vicinity to make
appropriate decisions. They are not intended to assure life or safety. Do not depend solely on this
function when using the product.
(The man down alarm is normally disabled and unavailable. To use this function, change the
product setting.)
 If a panic or man down alarm is triggered, those in the vicinity must take appropriate action after
assessing the situation.
Battery level check
 Check battery levels before using the product. The batteries may be depleted when the product is
used for the first time or after extended periods without use. Replace the batteries with new ones
before use.
 If a low battery voltage alarm occurs, gas cannot be detected. If the alarm is issued during use, turn
off the power and promptly charge or replace the batteries in a safe place.
Miscellaneous
 Gas cannot be detected if the sensor is covered with water such as rainwater. Do not use the
product in rain or submerge it in water.
 When wearing the product, make sure that it is exposed to the air. If it is covered or blocked, correct
measurement cannot be obtained, possibly resulting in accidents.
 Do not dispose of the product into fire.
 Do not attempt to wash the product, either in a washing machine or an ultrasonic cleaning machine.
 Do not block the buzzer sound opening. Doing so will muffle or silence the audible warning.
 Do not remove the battery unit while the power is turned on.

2 Important Safety Information 2-3. Caution information
- 11 -
2-3. Caution information
CAUTION
 Do not use the product in locations where it may be exposed to oil or chemicals, etc.
‧ Avoid using the product in locations where the product may be splashed with liquids such as
oil and chemicals.
‧ Do not place the product in locations where water or dirt accumulates. Placing the product in
such locations may cause malfunction due to water or dirt ingress into the buzzer sound opening,
etc.
 Do not use the product in locations where the temperature exceeds the range of operating
temperatures.
‧ The operating temperature range for the product is as follows. Avoid using the product at
temperatures outside the operating range.
Continuous use environment: -20 °C to +50 °C
Temporary use environment: -40 °C to +60 °C
‧ Avoid using the product for extended periods in locations where it is exposed to direct
sunlight.
‧ Avoid storing the product inside parked vehicles in hot weather.
 Adhere to the operating humidity range to prevent condensation forming inside the product.
Condensation forming inside the product may cause clogging or gas adsorption, which may prevent
accurate gas detection. Condensation must be avoided at all costs. In addition to the usage
environment, carefully monitor the temperature and humidity of the sampling point to prevent
condensation forming inside the product.
 Do not use walkie-talkies near the product.
‧ Radio waves from walkie-talkies or other radio wave transmitting devices near the product
may affect readings. If walkie-talkies or other radio wave transmitting devices are used, these
must be used away from the product where they do not affect operation.
‧ Do not use the product near devices that emit strong electromagnetic radiation
(high-frequency or high-voltage devices).
 Verif
y
that the o
p
eration status dis
p
la
y
is blinkin
g
before usin
g
the
p
roduct.

2 Important Safety Information 2-3. Caution information
- 12 -
CAUTION
 Be sure to perform regular maintenance.
The product must be maintained regularly to ensure safety. Continuing to use the product without
maintaining it will result in sensor sensitivity variations, preventing accurate gas detection.
 Miscellaneous
‧ Pressing buttons unnecessarily may change the settings, preventing alarms from activating
correctly. Avoid performing any operations not described in this operating manual.
‧ Do not drop the product or subject it to impact. Doing so may degrade texplosion-proof,
waterproof, dustproof, and gas detection performance.
‧ Do not use the product while charging it.
 Do not poke the buzzer or sensor openings with sharp-pointed items. Doing so may result in
ingress of water or foreign matter, resulting in malfunctions or damage to the product.
 Do not block the buzzer sound opening with tape or other objects. This will prevent adjustment of
the internal pressure of the product, which may result in malfunctions.
 Do not remove the panel sheet on the LCD display. Doing so will impair waterproof and dustproof
performance.
 Do not cover the infrared port with labels or any other objects. This will prevent infrared
communication.
 Battery replacement
‧ Be sure to turn off the power for the product before replacing the batteries in the dry battery
unit.
‧ Replace both batteries with new ones at the same time when replacing the batteries in the
dry battery unit.
‧ Note the polarity of the batteries.
 Usage
‧ The operating time will be reduced due to battery performance in cold environments.
‧ The response of the LCD display may slow at low temperatures.
‧ Always perform air calibration under conditions of pressure, temperature, and humidity
similar to those in the operating environment and in fresh air.
‧ Wait for the readout to stabilize before performing air calibration.
‧ If there is a temperature difference of 15 °C or more between the storage and usage
locations, turn on the power and allow the product to stand and acclimatize for about 10 minutes
in an environment similar to the usage location before performing air calibration in fresh air.
‧ When wiping the product clean, do not splash water on it or use organic solvents like alcohol
or benzine. Doing so may discolor or damage the surfaces of the product.
‧ If the product will not be used for extended periods, install new batteries before storing.
Replace the batteries every six months. Battery leaks may result in fire or injury.
‧ After a period of extended storage, be sure to perform calibration before resuming use. For
information on readjustment including calibration, please contact Riken Keiki.
Sensors
‧ Note that if combustible gas sensors are used in an environment where silicone compounds,
halides, high concentrations of sulfides, or high concentrations of solvent gases are present,
sensor life may be reduced, sensitivity to combustible gases may deteriorate, and accurate
readings may not be obtained. If use in such environments is unavoidable, use for the shortest
possible time and allow the product to stand in fresh air after use. Confirm that the reading returns
to normal and is stabilized.
‧ An oxygen concentration higher than a certain level is required in order for the combustible
gas sensor <%LEL> in the product to correctly detect gases and display concentrations.
‧ Do not expose the product to sudden pressure fluctuations. Oxygen readings will vary
temporarily, preventing accurate measurement.
‧ Do not use any gas other than nitrogen as the balance gas when calibrating or adjusting an
oxygen sensor. Otherwise, oxygen reading errors will increase, preventing accurate
measurement.
‧ When equipped with a carbon dioxide (CO2) sensor, it may show a high indication
immediately after energization due to the characteristics of the sensor
You Warm it up for about 10 to 20 minutes and use it after instructions are stable.

2 Important Safety Information 2-4. Safety information on ATEX/IECEx specifications
- 13 -
2-4. Safety information on ATEX/IECEx specifications
The product can be powered using either a dry battery unit (BUD-3R) or a lithium ion battery unit (BUL-3R).
The battery units can be swapped by the user.
Do not replace the battery unit or BUD-3R dry batteries or charge the BUL-3R in hazardous areas.
Explosion-proof specifications
・ I M1 Ex da ia I Ma, II 1 G Ex da ia IIC T4 Ga (with combustible gas sensor NCR-6309)
・ I M1 Ex ia I Ma, II 1 G Ex ia IIC T4 Ga (without combustible gas sensor NCR-6309)
・ Ambient temperature range: -40 °C to +60 °C
・ Ambient temperature range (for charging): 0 °C to +40 °C
Electrical specifications
・
Certificate numbers
・ IECEx: IECEx〇〇
・ ATEX: 〇〇 ATEX〇〇
Applicable standards:
・ IEC 60079-0: 2011 ・ EN60079-0:2012
・ IEC 60079-11: 2011 ・ EN60079-11:2012
・ IEC 60079-26: 2006 ・ EN60079-26:2007
Precautions
・ Do not charge the lithium ion battery unit in hazardous areas.
・ Use the dedicated charger to charge the lithium ion battery unit.
・ Do not replace the battery unit in hazardous areas.
・ Do not replace the dry batteries in hazardous areas.
・ Do not attempt to disassemble or modify the product.
・ Use only with connected alkaline batterie type LR03 by TOSHIBA or
MN2400/PC2400 by Duracell.
INST. No. 0 0 0 0 0 0 0 0 0 0 0
A B C D E
A: Year of manufacture (0 to 9)
B: Month of manufacture (1 to 9 for January to September, X for October, Y for November, Z for
December)
C: Manufacturing lot
D: Serial number
E: Factory code
2-7-6 Azusawa, Itabashi-ku, Tokyo, 174-8744, Japan
Phone: [phone]
Fax: [phone]
E-mail: [e-mail]
Website: htt
p
://www.rikenkeiki.co.
jp

3 Product Configuration 3-1. Main unit and standard accessories
- 14 -
3
3 Product Configuration
3-1. Main unit and standard accessories
Unpack and check the product and accessories.
If anything is missing, contact Riken Keiki.
Main unit
For detailed information on the names and functions of the product parts and the LCD display, see “3-2.
Part names and functions” on page 16.
GX-3R Pro main unit

3 Product Configuration 3-1. Main unit and standard accessories
- 15 -
Standard accessories
Lithium ion
battery unit
(BUL-3R)
(*1)
×1
Charger
(*1)
×1
Dry battery unit
(BUD-3R)
(*2)
×1
AAA alkaline
battery
(*2)
×2
Rubber protection
cover
×1
Protects the product
from impact if it is hit by
something or dropped.
Belt clip
×1
Attaches the product
to a belt.
* TIIS specification
only
Alligator clip
×1
Used when attaching the
product to a pocket
* ATEX/IECEx
specifications only
Hand strap
×1
Operating Manual Product warranty
Sensor warranty
*1, 2 Either a lithium ion battery unit and charger or a dry battery unit with AAA alkaline batteries will be
provided.
DANGER
Explosion-proofing
 Do not modify or alter the circuitry or configuration.
 When measuring oxygen concentrations, do not measure anything but mixtures of air and
combustible or toxic gases.
 When using the product in hazardous areas, take the following precautions to safeguard against
static electricity hazards:
① Wear anti-static clothing and conductive shoes (anti-static work shoes).
② When using the product indoors, stand on a conductive work floor (with a leakage resistance of
10 MΩ or less).
 The battery unit that can be connected is the BUL-3R (certificate number DEK18.0017) or BUD-3R
(certificate number DEK18.0018).

3 Product Configuration 3-2. Part names and functions
- 16 -
3-2. Part names and functions
This section describes the names and functions of the various parts of the main unit and the battery unit. It
also describes the LCD display.
Main unit
Name Main function
(1) LCD display Displays information such as gas type and gas concentration.
(2) POWER/MODE button Turns power on and off. This button is also used to confirm
settings in setting mode.
(3) AIR button Performs air calibration in measurement mode. This button is
also used to select settings in setting mode.
(4) Alarm LED arrays The lamps flash red if an alarm occurs.
(5) Infrared communication
port
This is used for data communication with a PC when using a
data logger management program.
(6) Buzzer sound opening Emits operating and alarm sounds. (Do not block.)
(7) Battery charging contact Contact for connecting the charger (EPU15-102-L6).
(8) Sensors Sensors are installed for detecting individual gases.
CAUTION
 Do not poke the buzzer or sensor openings with sharp-pointed items. Doing so may result in
ingress of water or foreign matter, resulting in malfunctions or damage to the product.
 Do not remove the panel sheet on the surface. This will negatively affect the waterproof and
dustproof performance.
 Do not cover the infrared communication port with labels or stickers. This will prevent infrared
communication.
 Do not block the buzzer sound opening with tape or other objects. This will prevent adjustment of
the internal pressure of the product, which may result in malfunctions.
(4), (5)
(1)
(4)
(3)
(6)
(2)
(8)
(7)

3 Product Configuration 3-2. Part names and functions
- 17 -
NOTE
 In this operating manual, buttons with multiple functions are described as follows in the operational
procedures:
Example: “POWER/MODE button” is described as follows:
・ POWER button when turning power on and off
・ MODE button when confirming settings
Battery unit
<Lithium ion battery unit (BUL-3R)>
<Dry battery unit (BUD-3R)>
Battery charging
contact Main unit
connection
terminals
Main unit connection
terminals
Battery cover

3 Product Configuration 3-2. Part names and functions
- 18 -
LCD display
Display example
Name Main function
(1) Operating status display Indicates the operating status. Blinks when normal.
(2) Clock display Displays the time.
(3) Battery level icon Indicates battery levels. See NOTE below for a guide to battery
level indications.
(4) Combustible gas
concentration Displays gas concentrations as numerical readouts.
(The type of gas displayed depends on the specifications.)
The concentration readout is updated each second for sensors
other than the combustible gas sensor.
The combustible gas concentration readout is updated every five
seconds (every 15 seconds for long-life battery operation).
(5) Carbon monoxide
concentration
(6) Hydrogen sulfide
concentration
(7) Oxygen concentration
(8) Sulfur dioxide
concentration
(9) Buzzer volume icon Indicates the buzzer volume. See NOTE below for information on
the icons displayed.
(10) Bluetooth on icon Indicates that BLE (Bluetooth) is turned on.
NOTE
 Approximate battery levels are indicated as follows:
Sufficient
Low
Needs charging (replace the batteries).
The battery level icon will blink if battery levels drop even further.
 The buzzer volume icon indicates “HIGH” or “LOW” as follows:
Volume HIGH
Volume LOW
 If the bump test expiration date display setting is enabled, “✔” is
displayed in the upper left of the LCD until the bump test expiration date.
For more information on the bump test expiration date display setting,
see “6-4-4. Bump test setting” on page 57.
 If the long-life battery function is enabled, “L” is displayed in the upper left
of the LCD.
 “MAINTE” is displayed on the LCD when user mode is selected.
 The Bluetooth on icon indicates the following:
Communicating: Constantly displayed
Advertising: Blinking at 1-second intervals
Stopped: Not displayed
(10)
(9)
(
2
)
(
9
)
(
10
)
(
3
)
(
6
)
(
8
)
(
1
)
(
4
)
(
5
)
(
7
)

4 Alarm Activation 4-1. Gas alarm activation
- 19 -
4
4 Alarm Activation
4-1. Gas alarm activation
<Alarm types>
A “gas alarm” is triggered if the concentration of the detected gas reaches or exceeds the alarm setpoints
shown in the following table: (Self-latching)
Gas alarm types include the first alarm (WARNING), second alarm (ALARM), third alarm (ALARM H), TWA
alarm, STEL alarm, OVER alarm (over scale), and M OVER alarm (minus sensor failure).
Gas alarms are prioritized as follows:
First alarm < second alarm < third alarm < M OVER alarm < OVER alarm < integrated alarm point < TWA
alarm < STEL alarm
<Default settings>
Item Measured
gas
Combustible
gas
Oxygen CO H2S CO2 SO2
Methane/HC
Measurement
range
0 to 100 ％ LEL 0 to 25 % 0 to 500 ppm 0 to 30 ppm 0 to 5 vol% 0 to 10,000 ppm 0 to 20 ppm
Service range
- 25.1 to 40 % 501 to 2,000 ppm 30.1 to 200 ppm 5.01 to 10 vol% - 20.05 to 100 ppm
Minimum
resolution
1 %LEL 0.1 % 1 ppm 0.1 ppm 0.01 vol% 20 ppm 0.05 ppm
Alarm setpoint
(TIIS
specification)
First alarm:
10 %LEL
Second alarm:
50 %LEL
Third alarm:
50 %LEL
OVER alarm:
100 %LEL
MOVER alarm:
-10%LEL
L alarm:
18.0 %
LL alarm:
18.0 %
H alarm:
25.0 %
OVER alarm:
40.0 %
MOVER alarm:
-1.6vol%
First alarm:
25 ppm
Second alarm:
50 ppm
Third alarm:
50 ppm
TWA alarm:
25 ppm
STEL alarm:
200 ppm
OVER alarm:
2,000 ppm
MOVER alarm:
-50ppm
First alarm:
1.0 ppm
Second alarm:
10.0 ppm
Third alarm:
10.0 ppm
TWA alarm:
1.0 ppm
STEL alarm:
5.0 ppm
OVER alarm:
200.0 ppm
MOVER alarm:
-10.0ppm
First alarm:
0.50 vol%
Second alarm:
3.00 vol%
Third alarm:
3.00 vol%
TWA alarm:
0.50 vol%
STEL alarm:
3.00 vol%
OVER alarm:
10.00 vol%
MOVER alarm:
-0.50vol%
First alarm:
5,000 ppm
Second alarm:
5,000 ppm
Third alarm:
5,000 ppm
TWA alarm:
5,000 ppm
STEL alarm:
-
OVER alarm:
10,000 ppm
MOVER alarm:
-1,000ppm
First alarm:
2.00 ppm
Second alarm:
5.00 ppm
Third alarm:
5.00 ppm
TWA alarm:
2.00 ppm
STEL alarm:
5.00 ppm
OVER alarm:
100.00 ppm
MOVER alarm:
-10.0ppm

4 Alarm Activation 4-1. Gas alarm activation
- 20 -
Alarm setpoint
(ATEX/IECEx
specifications)
First alarm:
10 %LEL
Second alarm:
25 %LEL
Third alarm:
50 %LEL
OVER:
100 %LEL
M OVER alarm:
-10 %LEL
L alarm:
19.5 %
LL alarm:
18.0 %
H alarm:
23.5 %
OVER alarm:
40.0 %
M OVER alarm:
-1.6 vol%
First alarm:
5 ppm
Second alarm:
50 ppm
Third alarm:
1,200 ppm
TWA alarm:
25 ppm
STEL alarm:
200 ppm
OVER alarm:
2,000 ppm
M OVER alarm:
-50 ppm
First alarm:
5.0 ppm
Second alarm:
30.0 ppm
Third alarm:
100.0 ppm
TWA alarm:
1.0 ppm
STEL alarm:
5.0 ppm
OVER alarm:
200.0 ppm
M OVER alarm:
-10.0 ppm
First alarm:
0.50 vol%
Second alarm:
3.00 vol%
Third alarm:
3.00 vol%
TWA alarm:
0.50 vol%
STEL alarm:
3.00 vol%
OVER alarm:
10.00 vol%
M OVER alarm:
-0.50 vol%
First alarm:
5,000 ppm
Second alarm:
5,000 ppm
Third alarm:
5,000 ppm
TWA alarm:
5,000 ppm
STEL alarm:
-
OVER alarm:
10,000 ppm
M OVER alarm:
-1,000 ppm
First alarm:
2.00 ppm
Second alarm:
5.00 ppm
Third alarm:
100.00 ppm
TWA alarm:
0.25 ppm
STEL alarm:
0.25 ppm
OVER alarm:
100.00 ppm
M OVER alarm:
-10.0 ppm
NOTE
 The default settings are as described in the table above.
 The alarm setpoints indicated for the first alarm (WARNING), second alarm (ALARM), third alarm
(ALARM H), TWA alarm, and STEL alarm in the table above can be changed. For information on how
to change the alarm setpoints, see “6-4-6. Alarm setpoint setting” on page 64.(For items with “-”
shown, the setpoint cannot be changed.)
 M OVER alarm (minus sensor failure) alerts when the zero point dives to the minus side.
<Gas alarm buzzer sounding and lamp flashing patterns>
If a gas alarm occurs, the user is notified by the buzzer sounding, alarm LED array flashing, and vibration,
in two stages.
The individual operations are as follows:
Alarm
type
First
alarm
Second
alarm
Third
alarm
TWA
alarm
STEL
alarm
OVER
alarm
M OVER
alarm
Buzzer
sounding
Repeated
alternating
strong and
weak
beeps at
about
1-second
intervals:
“Beep,
beep”
Repeated
alternate
strong and
weak
beeps at
about
0.5-second
intervals:
“Beep,
beep,
beep,
beep”
Repeated
alternate
strong and
weak
beeps at
about
0.5-second
intervals:
“Beep,
beep,
beep,
beep”
Repeated
alternate
strong and
weak
beeps at
about
1-second
intervals:
“Beep,
beep”
Repeated
alternate
strong and
weak
beeps at
about
1-second
intervals:
“Beep,
beep”
Repeated
alternate
strong and
weak
beeps at
about
0.5-second
intervals:
“Beep,
beep,
beep,
beep”
Repeated
intermittent
beeps at
about 1
second
intervals:
“Beep,
beep”
Alarm
LED
array
flashing
Repeated
flashing at
about
1-second
intervals
Repeated
flashing at
about
0.5-second
intervals
Repeated
flashing at
about
0.5-second
intervals
Repeated
flashing at
about
1-second
intervals
Repeated
flashing at
about
1-second
intervals
Repeated
flashing at
about
0.5-second
intervals
Repeated
flashing at
about
1-second
intervals
Vibration Vibration when alarm occurs None