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 : +81-3-3966-1113
Fax : +81-3-3558-9110
E-mail : intdept@rikenkeiki.co.jp
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.

- 11 -
2-4. Safety information
Necessaryy information for explosion proof construction of Model GX-3R.
Overview
The GX-3R can measure up to 4 gases using 3 sensors.
The GX-3R measures the combustible gases (LEL), oxygen (O2), hydrogen sulfide (H2S), and carbon
monoxide (CO).
This model displays measurement results on an LCD and issue gas alarms (via LED and buzzer) as
needed.
Gas sampling is by diffusion. The model does not have internal suction pumps.
Power sources
The GX-3R draws power from an integrated rechargeable Li-ion battery that is not user-replaceable.
A dedicated AC adapter is used for recharging the Li-ion battery.
<ATEX/IECEx specification>
Explosion proof
structure
Intrinsically safe explosion-proof construction and flame-proof enclosures
Specification for safety Ex da ia I Ma , Ex da ia IIC T4 Ga (with combustible gas sensor NCR-6309)
Ex ia I Ma , 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 data ・Lithium-ion battery: Maxell rechargeable battery model no. ICP463048XS
・The battery should be charged with the dedicated AC adapter or by power
from a IEC60950-certified SELV power source. The maximum voltage from
the charger shall not exceed 6.3Vdc.
Certificate numbers ・IECEx : IECEx DEK 17.0050 X
・ATEX : DEKRA 17 ATEX 0103 X
List of standards ・IEC 60079-0:2011
・IEC 60079-1:2014-06
・IEC 60079-11:2011
・EN60079-0:2012+A11:2013
・EN60079-1:2014
・EN60079-11:2012
・EN50303:2000
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)

- 12 -
WARNING
Do not attempt to disassemble or modify the instrument.
The combustible gas sensor NCR-6309, to measure LEL, is the only part of this Gas Monitor system
with flame - proof construction.
This product is an explosion-proof product and is not to be disassembled or modified with the
exception of specified parts.
NCR-6309 must not be exposed to ultraviolet light.
This product integrates a sensor having flameproof construction. If assembly is not performed as
specified, explosion protection performance will be compromised. When replacing the sensor and
filter, properly install genuine parts and torque to specification.
If the enclosure is damaged it shall be repaired before further use.
The Sensor shall not be exposed to ultraviolet light or used in equipment in which it is not fully
enclosed.
Do not charge in a hazardous location.
Do not charge the unit with a non-genuine charger.
Group I Additional Specific Condition
Do not give strong force or shock to NCR - 6309. There is a danger that the flame - proof
performance will be damaged due to breakage etc. This sensor uses flame-proof conditions of "low"
possibility of mechanical damage.
The enclosures shall be protected against exposure to hydraulic liquids, oil or grease.
Sensor cover
Sensor cap
Location of screws for performing replacement
Tightening specification: At least 10 N・cm
NCR-6309
Maximum sensor surface temperature 82.6°C

- 13 -
Instruments No.
INST. No. 00 0 000 0000 00
A B C D E
A: Year of manufacture (0 to 9)
B: Month of manufacture (1 to 9 for Jan.-Sep.; XYZ for Oct., Nov., Dec.)
C: Manufacturing lot
D: Serial number
E: Factory codes
<Japan Ex specification>
Explosion proof structure Intrinsically safe explosion-proof construction
Explosion proof class Ex ia IIC T4 Ga
Ambient temperature range* -40°C to +60°C
Ambient temperature range
(for charging)
0°C to +40°C
Rating 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)
Lists of standards JNIOSH-TR-46-1:2015
JNIOSH-TR-46-6:2015
* 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”
2-7-6 Azusawa, Itabashi-ku, Tokyo, 174-8744, Japan
Phone:+81-3-3966-1113
Fax: +81-3-3558-9110
E-mail:[email protected]o.jp
Website: htt
p
://www.rikenkeiki.co.
jp
WARNING
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).
②When using the product indoors, stand on a conductive work floor
(with a leakage resistance of 10 MΩor less).
DANGER
Charge the battery using the provided charger in a safe place.
Charge the battery at ambient temperatures between 0 °C and 40 °C.

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

- 15 -
Standard accessories
AC adapter
×1
Rubber protection
cover
×1
Protects the product
from impact if it is hit
by something or
dropped.
Alligator clip
×1
Allows attaching the
product to a pocket.
* ATEX/IECEx
specification only
Calibration adapter
(simple type)
×1
Used to perform gas
calibration and bump
test.
* ATEX/IECEx
specification only
Hand strap
×1
Belt clip
×1
Attaches the product to
a belt.
* Japan Ex specification

- 16 -
3-2. Part names and functions
This section describes the names and functions of the various parts of the main unit and 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 the 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 when 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 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 remove the panel sheet on the LCD display. Doing so will impair 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)

- 17 -
NOTE
In this operating manual, buttons that have multiple functions are described as follows in the
operational procedures:
Example: “POWER/MODE button” is described as follows:
POWER button when turning the power on and off
MODE button when confirming settings
LCD display
Name Main function
(1) Operation status
display Indicates the operation status. Blinks when normal.
(2) Clock display Displays the time.
(3) Combustible gas
concentration Displays gas concentrations as numerical readouts.
The concentration readout is updated every 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).
(4) Oxygen concentration
(5) Carbon monoxide
concentration
(6) Hydrogen sulfide
concentration
(7) Battery level icon Indicates battery levels. See NOTE below for a guide to battery
level indications.
NOTE
Approximate battery levels are indicated as follows:
Sufficient
Low
Needs charging.
The battery icon will blink if battery levels drop even further.
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 “6-4-3. Calibration expiration date setting” on page 44.
If the long-life battery function is enabled, “L” is displayed in the upper
left of the LCD.
“M” is displayed in the upper left of the LCD when user mode is selected.
(1)
(3)
(5)
(7)
(2)
(4)
(6)

- 18 -
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 O2CO H2S
HC or CH4
Measurement
range 0 to 100 %LEL 0 to 25 % 0 to 500 ppm 0 to 30 ppm
Service range - 25 to 40 % 500 to 2,000 ppm 30 to 200 ppm
Minimum
resolution 1 %LEL 0.1 % 1 ppm 0.1 ppm
Alarm
setpoint
(General
ATEX/IECEx
specification)
1st alarm: 10 %LEL
2nd alarm: 25 %LEL
3rd alarm: 50 %LEL
OVER alarm:
100 %LEL
MOVER alarm
:
-10%LEL
L: 19.5 %
LL: 18.0 %
H: 23.5 %
OVER alarm:40.0%
MOVER alarm
:
-1.6vol%
1st alarm: 25 ppm
2nd alarm: 50 ppm
3rd alarm: 1,200 ppm
TWA alarm: 25 ppm
STEL alarm: 200 ppm
OVER alarm:2,000 ppm
MOVER alarm:-50ppm
1st alarm: 5.0 ppm
2nd alarm: 30.0 ppm
3rd alarm: 100.0 ppm
TWA alarm: 1.0 ppm
STEL alarm: 5.0 ppm
OVER alarm: 200.0 ppm
MOVER alarm:-10.0ppm
Alarm
setpoint
(Japan Ex
specification)
1st alarm: 10 %LEL
2nd alarm: 50 %LEL
3rd alarm: 50 %LEL
OVER alarm:
100 %LEL
MOVER alarm
:
-10%LEL
L: 18.0 %
LL: 18.0 %
H: 25.0 %
OVER alarm:40.0 %
MOVER alarm
:
-1.6vol%
1st alarm: 25 ppm
2nd alarm: 50 ppm
3rd alarm: 50 ppm
TWA alarm: 25 ppm
STEL alarm: 200 ppm
OVER alarm:2,000 ppm
MOVER alarm:-50ppm
1st alarm: 1.0 ppm
2nd alarm: 10.0 ppm
3rd alarm: 10.0 ppm
TWA alarm: 1.0 ppm
STEL alarm: 5.0 ppm
OVER alarm: 200.0 ppm
MOVER alarm:-10.0ppm
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 “6-4-5. Alarm setpoint setting” on page 52. (For items with
“-” shown, the setpoint cannot be changed.)

- 19 -
<Gas alarm buzzer sounding and lamp flashing patterns>
When 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
t
y
pe
First
alarm
Second
alarm
Third
alarm
TWA
alarm
STEL
alarm
OVER
alarm
M OVER
alarm
Buzzer
sounding
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
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
V
ibration
Vibration when alarm occurs None
For gases other than oxygen: “Alarm Pattern (H-HH-HHH)” For oxygen: “Alarm Pattern (L-LL-H)”
<Gas alarm display>
If a gas alarm occurs, the alarm type is indicated at the bottom of the screen, and the corresponding gas
concentration display blinks.
If the detection range is exceeded (over scale), “OVER” blinks at the bottom of the screen and “∩∩∩”
blinks in the gas concentration display area.
Display example Methane (CH4) concentration: 10 %LEL First alarm triggered
Alarm
t
y
pe
First
alarm
Second
alarm
Third
alarm
TWA
alarm
STEL
alarm
OVER
alarm
M OVER
alarm
LCD
display
“WARNING”
appears at
the bottom of
the screen,
and the gas
concentration
value blinks.
“ALARM”
appears at
the bottom of
the screen,
and the gas
concentration
value blinks.
“ALARM H”
appears at
the bottom of
the screen,
and the gas
concentration
value blinks.
“TWA”
appears at
the bottom of
the screen,
and the gas
concentration
value blinks.
“STEL”
appears at
the bottom of
the screen,
and the gas
concentration
value blinks.
“OVER”
appears at
the bottom of
the screen,
and “∩∩∩”
blinks in the
gas
concentration
value display
area.
“M OVER”
appears at
the bottom of
the screen,
and “”
blinks in the
gas
concentration
value display
area.
Alarm lamp
Buzze
r
: 0.5-second interval
: 1-second interval
Second alarm
setpoint
0
Time
Reset
Second alarm
setpoint
First alarm
setpoint
0
Time
Reset
Alarm lamp
Buzze
r
: 0.5-second interval
: 1-second interval
First alarm
setpoint
Third alarm
setpoint
Third alarm
setpoint

- 20 -
NOTE
Responses to an alarm can be checked using the alarm test in display mode. Note, however, that
the gas concentration value will not blink in alarm tests.
4-2. Fault alarm activation
A fault alarm is triggered if an abnormality is detected in the product. (Self-latching)
Fault alarm types include system abnormality, clock abnormality, battery voltage abnormality, and sensor
abnormality.
If a fault alarm occurs, the user is notified by the buzzer sounding and alarm LED array flashing.
・Buzzer sounding: Repeated intermittent beeps at about 1-second intervals “Beep-beep, beep-beep”
・Alarm LED array flashing: Repeated flashing at about 1-second intervals
The following shows typical fault alarm displays:
System abnormality
Clock abnormality
Battery voltage abnormality
Sensor abnormality
If a fault alarm occurs, determine the cause and take appropriate action.
If the problem lies with the product and the fault occurs repeatedly, contact Riken Keiki immediately.
NOTE
For more information on malfunctions (error messages), see “
9
Troubleshooting” on page 81.
WARNING
A gas alarm indicates the presence of extreme danger. The user must take appropriate action after
taking appropriate steps to ensure safety.
Other manuals for GX-3R
1
Table of contents
Other Riken Keiki Monitor manuals

Riken Keiki
Riken Keiki GX-2009 User manual

Riken Keiki
Riken Keiki GX-2012 Series User manual

Riken Keiki
Riken Keiki GM-600 User manual

Riken Keiki
Riken Keiki FI-815A User manual

Riken Keiki
Riken Keiki OX-600 User manual

Riken Keiki
Riken Keiki GW-3 User manual

Riken Keiki
Riken Keiki GW-3 User manual

Riken Keiki
Riken Keiki OX-03 User manual

Riken Keiki
Riken Keiki SD-2500 User manual

Riken Keiki
Riken Keiki CO2RK-Lite User manual