Riken Keiki GX-9000 Series User manual

PT0E-2110
Portable Gas Detector
GX-9000 Series
GX-9000
GX-9000H
Operating Manual
(PT0-211)

Contents
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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 and product model...................................................................... 7
1-4 DANGER, WARNING, CAUTION, and NOTE ................................................................................... 10
1-5 Checking standards and explosion-proof specifications..................................................................... 11
2. Important Safety Information.................................................................................................................... 12
2-1 Danger information ............................................................................................................................ 12
2-2 Warnings ........................................................................................................................................... 14
2-3 Precautions........................................................................................................................................ 16
2-4 Safety information.............................................................................................................................. 20
3. Product Configuration .............................................................................................................................. 23
3-1 Main unit and accessories ................................................................................................................. 23
3-1-1 Main unit................................................................................................................................. 23
3-1-2 Accessories ............................................................................................................................ 24
3-1-3 Optional accessories .............................................................................................................. 25
3-2 Part names and functions .................................................................................................................. 30
3-2-1 Main unit and battery unit ....................................................................................................... 30
3-2-2 Control panel .......................................................................................................................... 32
3-2-3 LCD display ............................................................................................................................ 34
4. Alarm Functions....................................................................................................................................... 36
4-1 Gas alarm types ................................................................................................................................ 36
4-2 Gas alarm setpoints........................................................................................................................... 36
4-3 Gas alarm patterns ............................................................................................................................ 42
4-4 Fault alarm patterns........................................................................................................................... 45
4-5 Outside operating temperature range warning................................................................................... 46
5. Usage Instructions ................................................................................................................................... 47
5-1 Usage note ........................................................................................................................................ 47
5-2 Removing and attaching the battery unit and charging ...................................................................... 48
5-2-1 Removing and attaching the battery unit................................................................................. 48
5-2-2 Charging the lithium ion battery unit (BUL-9000) .................................................................... 50
5-2-3 Replacing the dry battery unit (BUD-9000) ............................................................................. 52
5-3 Connecting the gas sampling rod....................................................................................................... 54
5-4 Turning on the power......................................................................................................................... 55
5-5 Selecting hydrogen sulfide measurement mode range (GX-9000H) .................................................. 60
5-6 Performing fresh air adjustment in measurement mode..................................................................... 61
5-7 Measurement..................................................................................................................................... 64
5-7-1 Measuring gas concentration.................................................................................................. 67
5-7-2 Combustible gas concentration range changeover points....................................................... 69
5-7-3 Basic operating flow in measurement mode ........................................................................... 70
5-7-4 Confirmation beep operation .................................................................................................. 72
5-8 Recording gas concentration logs (snap logger) ................................................................................ 73
5-9 Stopping the pump............................................................................................................................. 74
5-10 Turning off the power....................................................................................................................... 75

Contents
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6. Settings (Display Mode)........................................................................................................................... 76
6-1 Display mode items ........................................................................................................................... 76
6-2 Switching to display mode ................................................................................................................. 79
6-3 Checking settings .............................................................................................................................. 80
6-3-1 Clearing the PEAK value ........................................................................................................ 80
6-3-2 Displaying the snap logger (gas concentration/alarm status).................................................. 81
6-3-3 Displaying adjustment records................................................................................................ 82
6-3-4 Displaying bump test records ................................................................................................. 83
6-3-5 Displaying alarm setpoints...................................................................................................... 84
6-4 Display mode settings........................................................................................................................ 86
6-4-1 Setting the NCF/TEF sensor range......................................................................................... 86
6-4-2 Combustible gas conversion gas selection ............................................................................. 87
6-4-3 Volatile organic compound (VOC) conversion gas selection................................................... 89
6-4-4 Setting the user ID.................................................................................................................. 91
6-4-5 Setting the station ID .............................................................................................................. 92
6-4-6 Setting a Bluetooth device connection .................................................................................... 93
6-4-7 Setting the buzzer volume ...................................................................................................... 94
6-4-8 Switching display language to English (ATEX/IECEx model).................................................. 95
6-4-9 Switching display language to Japanese (Japan Ex model) ................................................... 96
7. Settings (User Mode)............................................................................................................................... 97
7-1 User mode display items.................................................................................................................... 97
7-2 Switching to user mode ..................................................................................................................... 99
7-3 Gas alarm settings........................................................................................................................... 100
7-3-1 Setting alarm setpoints ......................................................................................................... 100
7-3-2 Setting alarm type................................................................................................................. 104
7-3-3 Setting alarm pattern ............................................................................................................ 106
7-3-4 Resetting alarm setpoints ..................................................................................................... 107
7-3-5 Enabling/disabling the alarm function ................................................................................... 108
7-4 Other user mode settings................................................................................................................. 109
7-4-1 Setting the buzzer................................................................................................................. 109
7-4-2 Enabling/disabling CO2fresh air adjustment......................................................................... 110
7-4-3 Selecting gas type for base gas adjustment ......................................................................... 111
7-4-4 Setting the date and time...................................................................................................... 112
7-4-5 Setting the display language................................................................................................. 113
7-4-6 Displaying version information.............................................................................................. 114
8. Maintenance .......................................................................................................................................... 116
8-1 Maintenance intervals and items...................................................................................................... 116
8-2 Performing gas adjustment .............................................................................................................. 118
8-2-1 Preparation for gas adjustment............................................................................................. 118
8-2-2 Performing fresh air adjustment............................................................................................ 122
8-2-3 Performing CO2zero adjustment .......................................................................................... 124
8-2-4 Performing base gas adjustment .......................................................................................... 127
8-2-5 Setting span adjustment ....................................................................................................... 129
8-2-6 Performing span adjustment ............................................................................................... 134
8-3 Performing bump tests..................................................................................................................... 136
8-4 Performing alarm tests..................................................................................................................... 138
8-5 Cleaning procedure ......................................................................................................................... 139
8-6 Parts replacement............................................................................................................................ 140

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8-6-1 Periodic replacement parts ................................................................................................... 140
8-6-2 Gas sampling rod dust filter replacement.............................................................................. 142
8-6-3 VOC sensor maintenance..................................................................................................... 143
9. Storage and Disposal............................................................................................................................. 148
9-1 Procedures for storage or when not in use for extended periods ..................................................... 148
9-2 Procedures for use after storage...................................................................................................... 149
9-3 Product disposal .............................................................................................................................. 149
10. Troubleshooting..................................................................................................................................... 150
10-1 Product abnormalities .................................................................................................................... 150
10-2 Reading abnormalities ................................................................................................................... 154
11. Product Specifications ........................................................................................................................... 155
11-1 Product specifications.................................................................................................................... 155
11-1-1 GX-9000 specifications....................................................................................................... 155
11-1-2 GX-9000H specifications .................................................................................................... 157
11-2 Sensor specifications..................................................................................................................... 158
11-2-1 Combustible gas sensors ................................................................................................... 158
11-2-2 Carbon dioxide sensor........................................................................................................ 162
11-2-3 Oxygen sensor ................................................................................................................... 163
11-2-4 Toxic gas sensors............................................................................................................... 165
11-2-5 VOC sensors ...................................................................................................................... 169
12. Appendix................................................................................................................................................ 170
12-1 Data logger function....................................................................................................................... 170
12-2 100 %LEL conversion list............................................................................................................... 172
12-3 Zero suppression function.............................................................................................................. 173
12-4 Zero follower function .................................................................................................................... 174
12-5 Volatile organic compound (VOC) conversion gas list.................................................................... 175
12-6 List of interference gases for electrochemical type sensors ........................................................... 198
12-7 Radio law certification.................................................................................................................... 201
12-8 Limited Warranty and Limitation Liability........................................................................................ 203

1. Product Overview 1-1 Introduction
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1
Product Overview
1-1 Introduction
Thank you for purchasing this GX-9000 Series Portable Gas Detector (“product” hereinafter).
This operating manual describes product operating procedures and specifications. It provides information
essential to correct use of the product.
Make sure you have read and fully understood the contents of this manual before using the product.
Keep this operating manual on hand to allow ready reference during use.
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.
Also refer to the corresponding manuals when using the following optional products:
SW-9000 Series Data Logger Management Program Operating Manual (PT0-208)
MT-9000 Series Setup Program Operating Manual (PT0-209)
RIKEN KEIKI accepts no liability for accidents or damage resulting from use of the product, whether within
or outside the warranty period.
Review the warranty policy described in ‘12-8 Warranty policy’.
<Models covered by this operating manual>
Before using the product, please confirm that the model of the product you purchased matches the model of
the product covered by this operating manual.
GX-9000
GX-9000H
1-2 Intended use
This product is a multi-gas detector capable of detecting combustible gases (%LEL), oxygen (O2) (oxygen
deficiency, excess oxygen), carbon monoxide (CO), hydrogen sulfide (H2S), carbon dioxide (CO2), ammonia
(NH3), chlorine (Cl2), ozone (O3), hydrogen chloride (HCl), sulfur dioxide (SO2), hydrogen cyanide (HCN),
and volatile organic compounds (VOCs) in air, and high concentrations of combustible gases (vol%) and
oxygen (O2) in nitrogen (N2) or inert gases.
One unit measures up to six different gas concentrations. The alarm function triggers an alarm if gas
concentrations reach or exceed the alarm setpoint.
The product is capable of measuring methane (CH4), commonly used in general plants and oil tankers, as
well as general combustible gases such as isobutane (HC (i-C4H10)), hydrogen (H2), and acetylene (C2H2).
Note that the measurement results provided by the product do not constitute a guarantee with respect to life
or safety.
Check again the specifications before use to perform gas measurement correctly in accordance with the
intended purpose.

1. Product Overview 1-2 Intended use
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The following sensors can be installed in the product:
Sensor type Detection principle Sensor model
Combustible gas
sensor
NCF sensor New ceramic type NCF-6322P (CH4/HC (i-C4H10)/H2
/
C2H2)
TEF sensor Thermal conductivity type TEF-7520P (CH4/HC (i-C4H10)/H2)
IRF sensor Non-dispersive infrared
type (NDIR)
IRF-4341 (CH4)
IRF-4345 (HC (i-C4H10))
Carbon dioxide
sensor IRF sensor Non-dispersive infrared type (NDIR) IRF-4443 (CO2)
Oxygen sensor ESR sensor Electrochemical type ESR-X13P (O2)
Toxic gas sensor
ESR sensor Electrochemical type ESR-A13i (H2S) (low concentrations)
ESR-A13P (CO)
ESF sensor Electrochemical type
ESF-A24R2 (H2S) (high concentrations)
ESF-B242 (NH3)
ESF-C92 (Cl2)
ESF-B249 (O3)
ESF-A24E2 (HCl)
ESF-A24D4 (SO2)
ESF-A24D (HCN) (Japan Ex model)
VOC*sensor PIF sensor Photo-ionization type (PID)
PIF-001 (VOC, 10.6 eV, ppb)
PIF-002 (VOC, 10.6 eV, ppm)
PIF-003 (VOC, 10.0 eV, ppm)
* Volatile organic compounds

1. Product Overview 1-3 Checking the detection target gases and product model
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1-3 Checking the detection target gases and product model
The detection target gases vary depending on the particular sensors installed in the product.
Check the detection target gases using the product code before use.
The GX-9000 Series alphanumeric product codes are categorized as follows:
<GX-9000/GX-9000H>
①: Product model
Symbol Details
C GX-9000
D GX-9000H
②: R sensor combination
Symbol R1 R2 R3
0 N/A (dummy sensor)
1 ESR-X13P (O2) ESR-A13i (H2S) ESR-A13P (CO)
2 ESR-X13P (O2) ESR-A13i (H2S) N/A (dummy sensor)
3 ESR-X13P (O2) N/A (dummy sensor) ESR-A13P (CO)
4 ESR-X13P (O2) N/A (dummy sensor)
5 N/A (dummy sensor) ESR-A13i (H2S) ESR-A13P (CO)
6 N/A (dummy sensor) ESR-A13i (H2S) N/A (dummy sensor)
7 N/A (dummy sensor) ESR-A13P (CO)
Explosion-
proof
specifications
Bluetooth (BLE) functionality
Battery type
F sensor (F1) combination
R sensor combination
①②③④⑤⑥⑦⑧⑨⑩⑪⑫
F sensor (F2/F3) combination
Product model

1. Product Overview 1-3 Checking the detection target gases and product model
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<GX-9000>
③④: F sensor (F1) combination
Symbol F1
00 N/A (dummy sensor)
P1 PIF-001 (VOC, 10.6 eV, ppb)
P2 PIF-002 (VOC, 10.6 eV, ppm)
P3 PIF-003 (VOC, 10.0 eV, ppm)
E1 ESF-B242 (NH3)
E2 ESF-C92 (Cl2)*1
E3 ESF-B249 (O3)*1
E4 ESF-A24E2 (HCl)
E5 ESF-A24D4 (SO2)
E6 ESF-A24D (HCN) Japan Ex model
R5 IRF-4443 (CO2)*2
*1: When this sensor is selected, ESR-A13i (H2S) cannot be selected for installation in ②: R sensor combination.
*2: This sensor can be selected only when NCF-6322P is installed for F3 in ⑤to ⑧F sensor (F2, F3) combination.
⑤to ⑧: F sensor (F2, F3) combination
Symbol F2 F3
00 00 N/A (dummy sensor)
00 N1 N/A (dummy sensor) NCF-6322P (CH4)
T1 N1 TEF-7520P (CH4) NCF-6322P (CH4)
00 N2 N/A (dummy sensor) NCF-6322P (HC (i-C4H10))
T2 N2 TEF-7520P (HC (i-C4H10)) NCF-6322P (HC (i-C4H10))
00 N4 N/A (dummy sensor) NCF-6322P (H2)*3
T4 N4 TEF-7520P (H2) NCF-6322P (H2)*3
00 N5 N/A (dummy sensor) NCF-6322P (C2H2)*3*4
R1 00 IRF-4341 (CH4) N/A (dummy sensor)
R1 R5 IRF-4341 (CH4) IRF-4443 (CO2)
R2 00 IRF-4345 (HC (i-C4H10)) N/A (dummy sensor)
R2 R5 IRF-4345 (HC (i-C4H10)) IRF-4443 (CO2)
00 R5 N/A (dummy sensor) IRF-4443 (CO2)
*3: When this sensor is selected, ESR-A13P (CO) cannot be selected for installation in ②: R sensor combination.
*4: When this sensor is selected, ESF-A24D4 (SO2) and ESF-A24D (HCN) cannot be selected for installation in ③④: F sensor
(F1) combination.

1. Product Overview 1-3 Checking the detection target gases and product model
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<GX-9000H>
③④: F sensor (F1) combination
Symbol F1
E8 ESF-A24R2 (H2S)
⑤to ⑧: F sensor (F2, F3) combination
Symbol F2 F3
00 00 N/A (dummy sensor)
00 R1 N/A (dummy sensor) IRF-4341 (CH4)
00 R2 N/A (dummy sensor) IRF-4345 (HC (i-C4H10))
<GX-9000/GX-9000H>
⑨: Battery type
Symbol Specifications
L Lithium ion battery unit BUL-9000
D Dry battery unit BUD-9000
⑩: Bluetooth (BLE) functionality
Symbol Specifications
0 Not Bluetooth compatible
1 Bluetooth compatible
⑪⑫: Explosion-proof specifications
Symbol Specifications
00 Japan Ex
50 ATEX/IECEx
<Example product codes>
The specifications for the product code examples listed here are as follows:
Example product code C1P1T1N1L0 00 C7P2R100D1 50 D2E800R1L1 00
Product model GX-9000 GX-9000 GX-9000H
R sensor
R1 ESR-X13P (O2) N/A ESR-X13P (O2)
R2 ESR-A13i (H2S) N/A ESR-A13i (H2S)
R3 ESR-A13P (CO) ESR-A13P (CO) N/A
F sensor
F1 PIF-001
(VOC, 10.6 eV, ppb)
PIF-002
(VOC, 10.6 eV, ppm) ESF-A24R2 (H2S)
F2 TEF-7520P (CH4) IRF-4341 (CH4) N/A
F3 NCF-6322P (CH4) N/A IRF-4341 (CH4)
Battery type BUL-9000 BUD-9000 BUL-9000
Bluetooth (BLE)
functionality Not compatible Compatible Compatible
Explosion-proof
specifications Japan Ex ATEX/IECEx Japan Ex

1. Product Overview 1-4 DANGER, WARNING, CAUTION, and NOTE
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1-4 DANGER, WARNING, CAUTION, and NOTE
This operating manual uses the following categories to indicate potential damage/hazards if the user
disregards the information provided and uses the product incorrectly:
DANGER This indicates situations in which improper handling may result in fatal or
serious injury or significant property damage.
WARNING This indicates situations in which improper handling may result in serious injury
or significant property damage.
CAUTION This indicates situations in which improper handling may result in minor injury or
minor property damage.
Additionally, usage recommendations are indicated as follows:
NOTE This indicates items that will be helpful to know when using the product.

1. Product Overview 1-5 Checking standards and explosion-proof specifications
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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.
Typical nameplates for explosion-proof electrical Typical nameplate for ATEX/IECEx model
equipment type certified (Japan EX) model
Type examination
certificate marking
locations
Ex marking/CE marking
location

2. Important Safety Information 2-1 Danger information
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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 Danger information
DANGER
Main unit explosion-proofing
Do not modify or alter the circuits or configuration.
When carrying and using the product in hazardous areas, the following general precautions must be
observed to safeguard against static electricity hazards:
・Wear anti-static clothing and conductive shoes (anti-static work shoes).
・When using the product indoors, stand on a conductive work floor (with a leakage resistance of 10 MΩ
or less).
The product is explosion-proof. With the exception of specified components, it cannot be disassembled
or modified.
Do not subject the buzzer opening on the main unit to impact.
The ratings for the main unit are as follows:
Power source: User-replaceable lithium ion battery unit model BUL-9000 or
user-replaceable dry battery unit BUD-9000
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 information on the operating temperature range, refer to ‘11-1 Product specifications’ and ‘11-2
Sensor specifications’.
Battery unit explosion-proofing
Do not modify or alter the circuits or configuration.
When carrying and using the product in hazardous areas, the following general precautions must be
observed to safeguard against static electricity hazards:
・Wear anti-static clothing and conductive shoes (anti-static work shoes).
・When using the product indoors, stand on a conductive work floor (with a leakage resistance of 10 MΩ
or less).
The battery unit can be used only after evaluation in combination with a main unit and only when
combined with a main unit that has passed the type examination.
The main unit to which the battery unit can be connected is the GX-9000 or GX-9000H.
The ratings for the BUL-9000 lithium ion battery unit are as follows:
Power source: 3.7 V DC, 250 mA
Battery charging contact allowable voltage: 5.7 V DC (SELV 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 information on the operating temperature range, refer to ‘11-1 Product specifications’ and ‘11-2
Sensor specifications’.

2. Important Safety Information 2-1 Danger information
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The ratings for the BUD-9000 dry battery unit are as follows:
Power source: 4.5 V DC, 250 mA
Interface connector allowable voltage: 5.7 V DC (SELV 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 information on the operating temperature range, refer to ‘11-1 Product specifications’ and ‘11-2
Sensor specifications’.
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.
Gas outlet
Oxygen-deficient air or other gas may be discharged from the gas outlet. Never breathe in this air.
High-concentration (100 %LEL or higher) gas may be discharged. Be sure to maintain a safe distance
from flame sources.

2. Important Safety Information 2-2 Warnings
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2-2 Warnings
WARNING
If an abnormality occurs
Contact RIKEN KEIKI immediately. Visit our website for information on the nearest RIKEN KEIKI office.
Website: https://www.rikenkeiki.co.jp/
Sampling point pressure
The product is designed to draw in gas at atmospheric pressure. There is a danger that detection
target gas may leak from inside the product if an excessive pressure is applied to the gas inlet (GAS
IN) or outlet (GAS OUT) of the product. Be careful to avoid excessive pressure during use.
Do not connect a gas sampling tube directly to locations pressurized above atmospheric pressure.
Doing so may result in damage to the internal pipes.
Sensor handling
Never disassemble the sensor.
Electrochemical type sensors in particular contain hazardous electrolyte. Contact with electrolyte may
result in skin inflammation. Contact with eyes may result in blindness. Contact with clothing may result
in discoloration or damage to the fabric.
If contact occurs, rinse the area immediately with plenty of water.
Do not use any gas other than nitrogen (N2) as the balance gas when adjusting the oxygen sensor.
Otherwise, oxygen (O2) reading errors will increase, preventing accurate measurement.
Fresh air adjustment in surrounding atmosphere
When fresh air adjustment is performed in the surrounding atmosphere, check to confirm that the air is
clean before starting. The presence of miscellaneous or interference gases will make it impossible to
adjust the product correctly, resulting in the danger of erroneous detection when actual gas leaks occur.
Action if a gas alarm occurs
A gas alarm indicates an extreme hazard. The user must take appropriate action after taking
appropriate steps to ensure safety.
Battery level check
Check the battery level before using the product. The batteries may be depleted when the product is
used for the first time or after extended periods without use. Always fully charge or replace with new
batteries before use.
Gas measurement will not be possible if a battery low voltage alarm occurs. If the alarm occurs during
use, turn off the power and promptly charge or replace the batteries in a safe place.
Miscellaneous
Do not use the product in rain or submerge it in water. Doing so may cause water to enter the product,
resulting in the failure of the sensors or the product. Even if this does not result in failure, a wet sensor
may be unable to detect gases.
When using the product, always make that the product is able to suck in air. If the product inlet is
covered or blocked, correct measurement cannot be obtained, possibly leading to accidents.
Do not leave the product exposed for extended periods to temperatures -10 °C or below. Doing so may
cause the pump valve to freeze, disabling normal operation of the pump.

2. Important Safety Information 2-2 Warnings
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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.
Do not subject the product to vibration or impact, such as by carrying it around with the water trap (sold
separately) fitted to it. Doing so may damage the gas inlet (GAS IN).

2. Important Safety Information 2-3 Precautions
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2-3 Precautions
CAUTION
Avoid use in locations where oil or chemicals may splash. Avoid deliberately submerging the
product in water.
Avoid using the product in locations where the product may be splashed with liquids such as oil and
chemicals.
The product is not designed to be water pressure resistant. Avoid exposing the product directly to
water from a faucet or shower as water may get in the product if it is subjected to water pressure. Note
that the product is waterproof against freshwater and tap water, but it is not waterproof against hot
water, saltwater, detergent, chemicals, or perspiration.
The gas inlet (GAS IN) and outlet (GAS OUT) are not waterproof. Take care to prevent water such as
rainwater from entering these parts. Failure to do so may prevent gas measurement.
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 or gas inlet
(GAS IN), etc.
The sensor sensitivity will be significantly reduced if dirty water, dust, or metal particles are drawn in.
Take adequate care when using in such environments.
The dustproof and waterproof construction rating of IP66/68 (IPx8 indicates no water ingress will occur
if the product is immersed to a depth of two meters for one hour) does not refer to whether or not the
product is capable of detecting gas during or after exposure to the corresponding conditions. Be sure
to remove any dust or water.
Do not use the product in locations outside the operating temperature range.
Avoid using the product at temperatures outside the operating temperature range.
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.
Use within the specified operating humidity range to avoid condensation in the product or gas
sampling tube.
Condensation forming inside the product or gas sampling tube may cause clogging or gas adsorption,
which may prevent accurate gas measurement. 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 transmitters 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).
Verify that the flow confirmation icon is rotating.
Correct gas measurement is not possible if the flow confirmation icon is not rotating. Check to confirm
that the suction is operating correctly.
Verify that the operating status icon is blinking.
If the operating status icon on the LCD is not blinking, gas cannot be measured correctly. (Refer to
‘3-2-3 LCD display’.)
Be sure to perform regular maintenance.
The product is a safety device and must be regularly maintained without fail. Continuing to use the
product without maintenance will result in sensor sensitivity variations, preventing accurate gas
measurement.

2. Important Safety Information 2-3 Precautions
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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 reduce accuracy.
Do not use the product while charging it.
Do not prod the buzzer sound opening with sharp objects. Doing so may result in malfunctions or
damage to the product and allow foreign matter inside.
Do not remove the panel sheet on the LCD display. Doing so will impair dustproof performance.
Sensors
Do not expose the product to sudden pressure fluctuations. Oxygen readings (O2) will vary temporarily,
preventing accurate measurement.
If highly adsorptive gas has been sucked in, allow the product to suck in clean air, and confirm that the
reading returns to zero before use.
If the separately sold sampling tube with float or weight is used when measuring highly adsorptive gas,
the gas may be adsorbed inside the tube, resulting in a lower concentration reading than the actual
concentration of the detection target gas at the measurement point.
Some sensors may exhibit positive sensitivity to gases other than the detection target gas.
Note that when the product is used in an environment where such gases are present, the reading may
be higher than the actual concentration of the detection target gas present.
<Examples of interference gases to which the sensor exhibits positive sensitivity>
Sensor detection
principle
Detection target gas name Interference gas
New ceramic type Methane (CH4)/isobutane (HC (i-C4H10))/
hydrogen (H2)/acetylene (C2H2)
All combustible gases
Non-dispersive infrared
type (NDIR)
Methane (CH4)/isobutane (HC (i-C4H10)) Hydrocarbon combustible
gases
Photo-ionization type
(PID)
Volatile organic compounds (VOCs) All volatile organic
compounds (VOCs)
Due to their operating principle, electrochemical type sensors may exhibit negative sensitivity to certain
interference gases. In environments where interference gases are present, the reading may be lower
than the actual concentration of the detection target gas present, and particularly at high
concentrations, the reading may even turn negative, triggering an M OVER alarm. (Refer to ‘12-6 List
of interference gases for electrochemical type sensors’.)
Note that if new ceramic type combustible gas sensors are used in an environment where silicone
compounds, halides, high-concentration sulfides, or high-concentration 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
suck in clean air afterward. Confirm that the reading returns to normal and is stabilized.
An oxygen concentration of at least 10 vol% is required in order for the new ceramic type combustible
gas sensor (%LEL) in the product to accurately measure gases and display concentrations.
Due to the sensor characteristics, an accurate reading may not be displayed immediately after turning
on the power. Allow the product to warm up for at least one minute after turning on the power to allow
the reading to stabilize before use. Allow the product to warm up for at least 10 minutes after turning
on the power before performing gas adjustment.
The reading of the carbon monoxide sensor may rise if exposed to high concentrations of volatile
organic compounds (VOCs). If the reading rises and will not return, the activated carbon filter in the
carbon monoxide sensor must be replaced. For information on activated carbon filter replacement,
contact RIKEN KEIKI.
The zero point for carbon monoxide and hydrogen sulfide sensors may fluctuate at low or high
temperatures. If this occurs, perform fresh air adjustment in the ambient atmosphere.

2. Important Safety Information 2-3 Precautions
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The hydrogen sulfide sensor may exhibit temporary fluctuations if exposed to sudden temperature
variations. Allow the product to stand and acclimatize in the ambient atmosphere.
If the VOC sensor is exposed to high concentrations of methane (CH4), ethane (C2H6), propane (C3H8),
or other gases, [----] may appear on the concentration display, the lamps may flash, and the buzzer
may sound, temporarily disabling measurement. In environments where these gases are present, even
if the concentration display does not indicate [----], be aware that the VOC concentration may not be
accurately measured.
Note that, even if the VOC sensor concentration display indicates [----], other unaffected sensors can
continue measurement.
<Example interference gases causing [----] to be displayed on the VOC sensor concentration display>
Interference gas Concentration
Methane (CH4) 6 vol% or more
Ethane (C2H6) 80 vol% or more
Propane (C3H8) 90 vol% or more
Battery replacement
Be sure to turn off the power for the product before replacing the batteries.
When replacing the batteries, replace all six with new batteries at the same time.
The following batteries must be used to ensure that the product meets explosion-proof standards.
(Applies only when using the dry battery unit)
Japan Ex model: Toshiba AA alkaline battery (LR6) ×6
ATEX/IECEx model: Toshiba AA alkaline battery (LR6) ×6 or Duracell (MN1500) ×6
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 fresh air adjustment under conditions of pressure, temperature, and humidity similar to
those in the operating environment and in clean air.
Wait for the reading to stabilize before performing fresh air adjustment.
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 for about 10 minutes in a similar environment to the usage
location to acclimatize before performing fresh air adjustment in clean air.
Do not use water or organic solvents such as alcohol or benzine when wiping the product. Doing so
may discolor or damage the surfaces of the product.
Even if the product is not used for extended periods, turn the power on at least once every six months
to check pump suction (by running the product for approximately three minutes). Grease inside the
pump motor may solidify and prevent operation if the product is not operated for extended periods.
After a period of extended storage, be sure to perform fresh air adjustment before resuming use. For
information on readjustment including fresh air adjustment, contact RIKEN KEIKI.

2. Important Safety Information 2-3 Precautions
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Do not use the product in locations where the following miscellaneous gases are present:
<Gases affecting sensor sensitivity>
Sensor type Miscellaneous gas type
NCF sensor
(New ceramic type)
・Organic silicone gases such as D4 siloxane and D5 siloxane, and
sulfur gases such as SOxand hydrogen sulfide (H2S) at
concentrations exceeding the detection range of the sensors installed
together
・Polymer substances such as ethylene oxide (C2H4O), acrylonitrile
(C3H3N), butadiene (C4H6), and styrene (C8H8)
・Catalyst poisons such as phosphorous compounds, halogenated
hydrocarbon, and metallic vapors
* The extent of the effect depends on the sensor model.
TEF sensor
(Thermal conductivity type) N/A
IRF sensor
(Non-dispersive infrared type
(NDIR))
N/A
ESF/ESR sensor
(Electrochemical type) Differs depending on sensor.
<Sensor-corroding gases>
Sensor type Miscellaneous gas type
NCF sensor
(New ceramic type)
Corrosive gases such as SOxand NOxand acidic gases such as
hydrogen fluoride (HF) and hydrogen chloride (HCl)
TEF sensor
(Thermal conductivity type)
High-concentration organic gases and high-concentration alcohol
(C2H6O)
IRF sensor
(Non-dispersive infrared type
(NDIR))
Corrosive gases such as SOxand NOxand acidic gases such as
hydrogen fluoride (HF) and hydrogen chloride (HCl)
ESF/ESR sensor
(Electrochemical type) N/A
Take care when installing the product in locations where the following interference gases are present.
Sensor type Miscellaneous gas type
NCF sensor
(New ceramic type)
Hydrocarbons, alcohols (C2H6O), and organic solvents, etc., other than
the target gas
TEF sensor
(Thermal conductivity type) Organic gases, alcohols (C2H6O), carbon dioxide (CO2), argon (Ar)
IRF sensor
(Non-dispersive infrared type
(NDIR))
Combustible gas sensor: Hydrocarbons, alcohols (C2H6O), organic
solvents, and water (H2O), etc. other than the target gas
Carbon dioxide sensor: High-concentration carbon monoxide (CO),
nitrous oxide (N2O), and nitrogen monoxide (NO), etc.
ESF/ESR sensor
(Electrochemical type) Differs depending on sensor.

2. Important Safety Information 2-4 Safety information
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2-4 Safety information
<Product overview>
This product is a suction-type portable gas detector. It can measure up to six different gas types. When the
gas concentration exceeds the alarm point, an LCD display, LED and piezoelectric buzzer will be activated
to alert.
Up to 3 R-sensors for the measurement of O2, H2S, and CO as well as a maximum of 3 F-sensors out of 5 to
measure Combustible gases, Toxic gases, CO2and VOC can be mounted.
F-sensor will internally process as far as concentration calculation, and transmit digital data for gas
concentration to the main CPU.
Sampling of gas is done by the pump installed within the device. The GX-9000 has one built-in pump to
perform simultaneous measurement using all sensors installed in the product. The GX-9000H is internally
divided into two systems to manually switch between two pumps depending on the target gas.
<Power source>
Either lithium-ion battery unit “BUL-9000” or alkaline battery unit “BUD-9000” can be installed into
GX-9000.
BUL-9000 is specified for chargeable lithium-ion batteries. Uses three Panasonic NCR18650GA batteries
arranged in parallel.
BUD-9000 is specified to use dry batteries. Japan Ex models can use six LR6 batteries manufactured by
Toshiba. ATEX/IECEx models can use either six LR6 batteries manufactured by Toshiba or six MN1500
batteries manufactured by Duracell. Six batteries are used with two sets of three arranged in parallel.
Since these 2 kinds of batteries differ in the increase of temperature when shorted, their temperature
ranges and classes also differ.
Structure of battery unit allows end users to replace batteries by themselves.
The battery should be charged with the dedicated AC adapter or by power from IEC60950-certified SELV
power source, or IEC62368-1-certified ES1 power source. The maximum voltage from the charger shall
not exceed 5.7 Vdc.
It is also possible to perform USB data communication with a PC that meets the above requirements.
Batteries should only be charged and replaced in non-hazardous locations.
Backup battery type CR1220 manufactured by Maxell.
<Japan Ex models>
Ex code
Main unit: Ex da ia IIC T4 Ga (with combustible gas sensor NCF-6322)
Ex ia IIC T4 Ga (without combustible gas sensor NCF-6322)
BUL-9000 lithium ion battery unit: Ex ia IIC T4 Ga
BUD-9000 dry battery unit: Ex ia IIC T4 Ga
Explosion-proofing guideline compliance
Main unit: JNIOSH-TR-46-1:2020
NIOSH-TR-46-2:2018
NIOSH-TR-46-6:2015
BUL-9000 lithium ion battery unit: JNIOSH-TR-46-1:2020
NIOSH-TR-46-6:2015
BUD-9000 dry battery unit: JNIOSH-TR-46-1:2020
NIOSH-TR-46-6:2015