Riken Keiki GX-3R User manual

PT0E-1767
Portable Gas Monitor
GX-3R
Operating Manual
(PT0-164)
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/

- 2 -
Contents
1 Product Overview ............................................................................................................................................ 4
1-1. Introduction ............................................................................................................................................ 4
1-2. Intended use .......................................................................................................................................... 4
1-3. DANGER, WARNING, CAUTION, and NOTE.......................................................................................6
1-4. Checking standards and explosion-proof specifications ....................................................................... 6
2 Important Safety Information......................................................................................................................... 7
2-1. Danger information ................................................................................................................................ 7
2-2. Warning information ............................................................................................................................... 8
2-3. Caution information................................................................................................................................ 9
2-4. Safety information ................................................................................................................................ 11
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
LCD display .........................................................................................................................................17
4 Alarm Activation........................................................................................................................................... 18
4-1. Gas alarm activation ............................................................................................................................18
4-2. Fault alarm activation...........................................................................................................................20
5 Usage Instructions.......................................................................................................................................21
5-1. Before using the product......................................................................................................................21
5-2. Preparing startup .................................................................................................................................21
5-2-1. Charging the lithium ion battery................................................................................................21
5-3. Startup.................................................................................................................................................. 23
Turning on the power .......................................................................................................................... 23
Screen transition from powering on to displaying measurement screen ...........................................24
5-4. Air calibration........................................................................................................................................27
Air calibration procedure .....................................................................................................................27
5-5. Gas detection .......................................................................................................................................28
5-5-1. Basic operating procedures......................................................................................................28
5-5-2. Measurement mode..................................................................................................................29
5-6. Turning off the power ........................................................................................................................... 31
6 Setting Procedure........................................................................................................................................32
6-1. Display mode ....................................................................................................................................... 32
6-1-1. Displaying display mode...........................................................................................................32
6-1-2. Display mode display details ....................................................................................................32
6-2. Display mode settings..........................................................................................................................34
6-2-1. Clearing PEAK value display....................................................................................................34
6-2-2. Combustible conversion gas selection.....................................................................................35
6-2-3. Long-life battery setting ............................................................................................................37
6-2-4. Calibration data display ............................................................................................................38
6-2-5. Bump data display ....................................................................................................................39
6-2-5. Alarm setpoint display............................................................................................................... 40
6-3. User mode............................................................................................................................................41
6-3-1. Displaying user mode ...............................................................................................................41
6-3-2. User mode settings................................................................................................................... 42
6-4. User mode settings ..............................................................................................................................44
6-4-1. Bump test..................................................................................................................................44
6-4-2. Calibration.................................................................................................................................44
6-4-3. Calibration expiration date setting............................................................................................ 44
6-4-4. Bump test setting......................................................................................................................47
6-4-5. Alarm setpoint setting ...............................................................................................................52

- 3 -
6-4-6. Lunch break: ON/OFF ..............................................................................................................54
6-4-7. Confirmation beep setting ........................................................................................................55
6-4-8. LCD lighting time setting ..........................................................................................................57
6-4-9. Key tone: ON/OFF .................................................................................................................... 57
6-4-10. Display mode item display: ON/OFF ......................................................................................58
6-4-11. Date and time setting..............................................................................................................58
6-4-12. User password setting ............................................................................................................59
6-4-13. ROM/SUM display .................................................................................................................. 60
7 Maintenance ................................................................................................................................................61
7-1. Maintenance intervals and maintenance items ................................................................................... 61
Maintenance service ...........................................................................................................................62
7-2. Calibration ............................................................................................................................................63
7-2-1. Preparation for calibration ........................................................................................................ 63
7-2-2. Calibration setting menu...........................................................................................................65
7-2-3. Air calibration ............................................................................................................................66
7-2-4. Auto calibration ......................................................................................................................... 67
7-2-5. Switch from AUTO calibration to measurement start screen ................................................... 69
7-2-6. Auto calibration cylinder setting................................................................................................70
7-2-7. Auto calibration gas concentration selection............................................................................ 71
7-3. Bump test .............................................................................................................................................72
7-3-1. Perform bump test (BUMP TEST) ....................................................................................................72
7-3-2. Switching from bump test (BUMP TEST) to measurement start screen..........................................73
7-4. Cleaning instructions............................................................................................................................ 74
7-5. Parts replacement................................................................................................................................75
7-5-1. Periodic replacement parts.......................................................................................................75
7-5-2. Filter replacement.....................................................................................................................76
8 Storage and Disposal ..................................................................................................................................79
8-1. Procedures for storage or when not in use for extended periods ....................................................... 79
8-2. Procedures for use after storage .........................................................................................................79
8-3. Product disposal...................................................................................................................................80
9 Troubleshooting...........................................................................................................................................81
9-1. Product abnormalities ..........................................................................................................................81
9-2. Reading abnormalities .........................................................................................................................83
10 Product Specifications.................................................................................................................................84
10-1. Specifications list ...............................................................................................................................84
10-2. Accessory list .....................................................................................................................................87
11 Appendix ......................................................................................................................................................88
Data logger function ....................................................................................................................................88
100 %LEL = ppm conversion list.................................................................................................................90
Revision or Abolition History .......................................................................................................................91

- 4 -
1
1 Product Overview
1-1. Introduction
Thank you for your purchase of the GX-3R Portable Gas Monitor (“product” hereinafter). First, please
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.
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 understood 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 three types of sensors to enable detection of four
different gas types using a single unit.
The product comes in several different types, depending on the combinations of detection target gases.
Check the specifications 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 in the air and
issues an alarm if concentrations exceed preset levels, thereby alerting users to the hazards of gas
poisoning and oxygen deficiency.

- 5 -
<List of detection target gases (installed sensor models) by type>
Type
Detection target gases (installed sensor models)
Combustible
gas
<HC or CH4>
(NCR-6309)
Oxygen
(ESR-X13P)
Carbon
monoxide/hydrogen
sulfide
(ESR-A1DP)
Hydrogen
sulfide
(ESR-A13i)
Carbon
monoxide
(ESR-A13P)
Carbon
monoxide
(ESR-A1CP)*
Type A 
Type B 
Type C 

Type CH 

Type D 
Type E 
Type F 

Type FH 

TYPE G 
Type I 

Type IH 

Type K

* 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.

- 6 -
1-3. 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.
1-4. 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.
ATEX/IECEx,CE marking type name plate Japan Ex type name plate
Ex marking
CE marking Type examination
certificate marking

- 7 -
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. Danger information
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 MΩor less).
The ratings are as follows:
Power supply: Battery pack (BP-3R): 3.7 V DC, 200 mA
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”.)
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.
Main unit

- 8 -
2-2. Warning information
WARNING
If an abnormality is discovered in the product
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/
Sensor handling
Never 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.
Battery level check
Check the battery level before using the product. The battery may be depleted when the product is
used for the first time or after extended periods without use. Charge the battery 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 the battery 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.

- 9 -
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).
Verify that the operation status display is blinking before using the product.
If the operation status display is not blinking, gas cannot be detected properly.
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, the
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.

- 10 -
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 explosion-proof,
waterproof, dustproof, and gas detection performance.
‧ Do not use the product while charging it.
Do not poke the buzzer sound opening 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 other objects. This will prevent infrared
communication.
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 and
benzine. Doing so may discolor or damage the surfaces of the product.
‧ After a period of extended storage, be sure to perform calibration before resuming use. For
information on readjustment including calibration, please contact Riken Keiki.