PT0E-2063

Portable Gas Detector

RX-8000(MED specification)
Operating Manual(PT0-119)<Contents>
1. Outline of the Product........................................................................................................... 2
1-1. Preface .............................................................................................................................. 2
1-2. Purpose of use .................................................................................................................. 2
1-3. Definition of DANGER, WARNING, CAUTION, and NOTE ............................................... 3
1-4. Method of confirmation for Standards and Explosion proof specification .......................... 3
2. Important Notices on Safety ................................................................................................. 4
2-1. Danger cases .................................................................................................................... 4
2-2. Warning cases .................................................................................................................. 6
2-3. Names of internal product components ............................................................................. 7
2-4. Safety information (Applicable for ATEX/IECEx) ............................................................... 9
3. Product Components ............................................................................................................ 10
3-1. Main unit and standard accessories .................................................................................. 10
3-2. Names and functions for each part ................................................................................... 12
4. How to Use ........................................................................................................................... 14
4-1. Before using the gas detector ........................................................................................... 14
4-2. Preparation for start-up ..................................................................................................... 14
4-3. Basic operating procedures............................................................................................... 17
4-4. How to start the gas detector ............................................................................................ 18
4-5. How to detect .................................................................................................................... 20
4-6. Modes ............................................................................................................................... 22
4-7. Air calibration mode ........................................................................................................... 23
4-8. Display/setting mode ......................................................................................................... 25
4-9. Pump OFF mode............................................................................................................... 28
4-10. Manual memory mode .................................................................................................... 29
4-11. How to exit ....................................................................................................................... 30
5. Operations and Functions .................................................................................................... 31
5-1. Fault alarm pattern ............................................................................................................ 31
5-2. Other functions .................................................................................................................. 32
6. Maintenance ......................................................................................................................... 33
6-1. Maintenance intervals and items ....................................................................................... 33
6-2. Gas calibration .................................................................................................................. 35
6-3. How to clean ..................................................................................................................... 39
6-4. Parts replacement ............................................................................................................. 40
7. Storage and Disposal ........................................................................................................... 42
7-1. Procedures to store the gas detector or leave it for a long time ........................................ 42
7-2. Procedures to use the gas detector again ......................................................................... 43
7-3. Disposal of products .......................................................................................................... 43
8. Troubleshooting .................................................................................................................... 44
9. Product Specifications .......................................................................................................... 46
9-1. List of specifications .......................................................................................................... 46
9-2. List of accessories............................................................................................................. 47
10. Definition of Terms .............................................................................................................. 48-1-RX-8000

1 Outline of the Product1-1. Preface

1

Outline of the Product1-1. Preface
Thank you for choosing our portable gas detector RX-8000 (MED specification). Please check that themodel number of the product you purchased is included in the specifications on this manual.
This manual explains how to use the gas detector and its specifications. It contains information required forusing the gas detector properly. Not only the first-time users but also the users who have already used the
product must read and understand the operating manual to enhance the knowledge and experience before
using the indicator/alarm unit.

1-2. Purpose of use
This product is a portable explosion-proof gas detector that measures the concentration of combustible gas
and oxygen in crude oil vapors, etc. in inert gases or atmosphere.
Detection results are not intended to guarantee life or safety in any way.
There are 4 kinds of line up for this mode. Check the specifications before use and conduct gas detection
properly in accordance with purposes.
In addition to this operating manual, an operating manual for the data logger management program (option)
is available for the gas detector. Request RIKEN KEIKI if it is needed.
Product line up
Product

Detectable gas
Combustible (HC)RX-8000 (HC/O2)〇
RX-8000 (CH4/O2)
RX-8000 (HC)〇RX-8000 (CH4)
HC : Isobutane (i-C4H10) calibration

Combustible (CH4)
〇
〇

-2-

Oxygen (O2)〇〇-

RX-8000

1 Outline of the Product1-3. Definition of DANGER, WARNING, CAUTION, and NOTE

1-3. Definition of DANGER, WARNING, CAUTION, andNOTE
DANGER

This message indicates that improper handling may cause serious damage on
life, health or assets.

WARNING

This message indicates that improper handling may cause serious damage on
health or assets.

CAUTION

This message indicates that improper handling may cause minor damage on
health or assets.

NOTE

This message indicates advice on handling.

1-4. Method of confirmation for Standards andExplosion proof specification
This instrument has some specification depends on standard and explosion proof certificate. Please confirm
the detector specification before using. Please refer Declaration of Conformity that is at the end of thismanual if you have CE marking type.
You can confirm instrument specification to see name plate as follows.

MED
marking

EX/CEmarking

Name plate attachment position-3-

RX-8000

2 Important Notices on Safety

2-1. Danger cases

2

Important Notices on
Safety2-1. Danger cases
DANGER<About explosion-proof> Do not modify or change the circuit or structure, etc.
【RX-8000】 When measuring the oxygen concentration, do not measure anything but a mixture of air andcombustible gases or vapors and toxic gases.
 When using this gas detector in a hazardous area, take the following countermeasures forpreventing dangers resulting from electrostatic charges.
(1) Wear anti-static clothes and conductive shoes (anti-static work shoes).
(2) For indoor use, use the gas detector while standing on a conductive work floor (with aleakage resistance of 10 MΩ or less).
 IP protection class: IP20
* IP20 is a protection class on explosion-proof certification. The IP protection class is compliant
to IP67 level by factory default.
 Make sure that the product model on the nameplate is correct.
Inappropriate combinations of models deviate from the range of explosion-proof certification.
The nameplate shows the followings as well as the product model.
Product model: Main unit: RX-8000 (TC20782)
Lithium ion battery unit: BUL-8000(R)(TC20784),BUL-8000(R1)(TC21112)
Manufacturer: RIKEN KEIKI Co., Ltd.
Explosion proof class : 【RX-8000】Ex ia IIC T4【BUL-8000(R), BUL-8000(R1)】 Ex ia IIC T4
Ambient temperature : -20 - +50 °C
Charging terminal rating : 【BUL-8000(R), BUL-8000(R1)】 Allowable voltage AC 250 V 50/60 Hz
Warnings: 【BUL-8000(R), BUL-8000(R1)】 Inhibit to take off battery unit in
non-hazardous area.
Nameplate location

RX-8000-4-

2 Important Notices on Safety

2-1. Danger cases

DANGER< About explosion-proof of the main unit> The battery units that can be connected are the BUL-8000(R)(TC20784), BUL-8000(R1)(TC21112).
 The specifications of the gas detector are as follows:
Pump circuit: Allowable voltage of 4.95 V, allowable current of 1.12 A, andallowable power of 1138 mW
Infrared detection circuit : Allowable voltage of 4.95 V, allowable current of 0.834 A, andallowable power of 853 mW
Buzzer circuit: Allowable voltage of 4.95 V, allowable current of 0.431 A, andallowable power of 441 mW
Main circuit: Allowable voltage of 4.95 V, allowable current of 0.717 A, andallowable power of 733 mW
Backup circuit: 3.0 VDC, 10 µA
Ambient temperature: -20 °C - +50 °C< About explosion-proof of the battery unit > The main unit that can be connected is RX-8000(TC20782) only.
The use with unspecified main units deviates from the range of explosion-proof certification.
 The specifications of the BUL-8000(R), BUL-8000(R1) are as follows:
Pump circuit: Maximum voltage of 4.25 V, maximum current of 1.12 A, andmaximum power of 901 mW
Infrared detection circuit : Maximum voltage of 4.25 V, maximum current of 0.768 A, andmaximum power of 618 mW
Buzzer circuit: Maximum voltage of 4.25 V, maximum current of 0.410 A, andmaximum power of 330 mW
Main circuit: Maximum voltage of 4.25 V, maximum current of 0.653 A, andmaximum power of 526 mW
Battery charging contact : Allowable current of 250 VAC
Ambient temperature: -20 °C - +50 °C*Chargin has to be done with the dedicated AC adaptor in non-hazardous area.
And, the temperature should be beteen 0 °C - +40 °C.
 Do not attach and remove the battery unit in a hazardous location.
< About use > While conducting measurement in a manhole or confined space, do not lean over or look into the
manhole or closed space. It may lead to dangers because oxygen-deficient air or other gases
may blow out.
 Oxygen-deficient air or other gases may blow out from the gas exhausting outlet. Never inhale
the air or gases.
 High-concentration (more than LEL) gases may blow out. Never use fire near the gas detector.

-5-RX-8000

2 Important Notices on Safety

2-2. Warning cases

2-2. Warning cases
WARNING< Sampling point pressure > The gas detector is designed to draw gases around it under the atmospheric pressure. If
excessive pressure is applied to the gas inlet and outlet (GAS IN, GAS OUT) of the gas detector,
detected gases may leak out from its inside and may cause dangerous conditions. Be sure that
excessive pressure is not applied to the detector while used.
 Do not connect the gas sampling hose directly to a location with a pressure higher than theatmospheric pressure. The internal piping system may be damaged.
< Handling of sensor >Do not disassemble the galvanic cell type sensor because it contains electrolyte. Electrolyte may
cause severe skin burns if it contacts skin, while it may cause blindness if its contacts eyes.
If electrolyte is adhered on your clothes, that part on your clothes is discolored or its material isdecomposed. If contact occurs, rinse the area immediately with a large quantity of water.
< Fresh air adjustment in atmosphere >When the air calibration is performed in the atmosphere, check the atmosphere for freshness
before beginning the air calibration. If other gases exist, the adjustment cannot be performed
properly, thus leading to dangers when the gas leaks.
< Battery level check > Before use, check that there remains sufficient battery power. When the gas detector is used forthe first time or is not used for a long period, the batteries may be exhausted. Either fully charge
the batteries before use.
 If a low battery voltage alarm is triggered, gas detection cannot be conducted. If the alarm istriggered during use, turn off the power and promptly charge the batteries in a non-hazardousarea.
< Others > Do not throw the gas detector into fire.
 Do not wash the gas detector in a washing machine or ultrasonic cleaner.
 Do not block the buzzer sound hole. No alarm sound can be heard.
 Do not remove the battery unit while the power is ON.
 Do not drop or give shock to the gas detector by, for example, relocating the gas detector with awater trap, an optional accessory, attached. The gas inlet may be damaged.

RX-8000-6-

2 Important Notices on Safety

2-3. Names of internal product components

2-3. Names of internal product components

CAUTION< Do not use the gas detector where it is exposed to oil, chemicals, etc. Do not submerge the gas
detector under water on purpose. > Do not use in a place where the gas detector is exposed to liquids such as oil and chemicals.
 The gas detector, being compliant to IP67, is not water-pressure-resistant. Do not use the gas
detector where a high water pressure is applied to it (under a faucet, shower, etc.) or submerge it
under water for a long time. The gas detector is water-proof only in fresh water and runningwater, and not in hot water, salt water, detergent, chemicals, human sweat, etc.
 The gas inlet and outlet are not water-proof. Be careful not to let water such as rainwater get into
these parts. Because this may cause trouble and gas cannot be detected.
 Do not place the gas detector where water or dirt gets accumulated. The gas detector placed atsuch a location may malfunction due to water or dirt that gets into the buzzer opening, gas inlet,etc.
 Note that drawing in dirty water, dust, metallic powder, etc. will significantly deteriorate thesensor sensitivities. Be careful when the gas detector is used in an environment where theseelements exist.
< Do not use the gas detector in a place where the temperature drops below -20 ºC or rises over
50 ºC. > The operating temperature of the gas detector is -20 °C - +50 °C. Do not use the gas detector at
higher temperatures, humidities, and pressures or at lower temperatures than the operating
range.
 Avoid long-term use of the gas detector in a place where it is exposed to direct sunlight.
 Do not store the gas detector in a sun-heated car.
< Observe the operating restrictions to prevent condensation inside the gas detector or gas
sampling hose. >Condensation formed inside the gas detector or gas sampling hose causes clogging or gas
adsorption, which may disturb accurate gas detection. Thus, condensation must be avoided. In
addition to the operating environment, carefully monitor the temperature/humidity of thesampling point to prevent condensation inside the gas detector or gas sampling hose. Pleaseobserve the operating restrictions.
< Do not use a transceiver near the gas detector. > Radio wave from a transceiver near the gas detector may disturb readings. If a transceiver isused, it must be used in a place where it disturbs nothing.
 Do not use the gas detector near a device that emits strong electromagnetic waves(high-frequency or high-voltage devices).
< Verify that the pump driving indicator is rotating before using the gas detector. >If the pump driving indicator is not rotating, gas detection cannot be performed properly. Check
whether the flow rate is lost.
< Never fail to perform a regular maintenance. >Since this is a safety unit, a regular maintenance must be performed to ensure safety.
Continuing to use the detector without performing a maintenance will compromise the sensitivityof the sensor, thus resulting in inaccurate gas detection.

-7-

RX-8000

2 Important Notices on Safety

2-3. Names of internal product components

CAUTION< Others > Pressing switches unnecessarily may change the settings, preventing alarms from activatingcorrectly. Operate the gas detector using only the procedures described in this operating
manual.
 Do not drop or give shock to the gas detector. The water-proof and explosion-proof properties
and accuracy may be deteriorated.
 Do not use the gas detector while recharging it.
 When you measure concentrations of oxygen in inert gases for a long time, the carbon dioxide
concentration in the air must be 15 % or less. When you use the gas detector in the inert gas witha carbon dioxide concentration of 15 % or higher, perform measurement in as short time as
possible. Using the gas detector under high concentrations for a long time may shorten the life of
the oxygen sensor.

RX-8000-8-

2 Important Notices on Safety

2-4. Safety information (Applicable for ATEX/IECEx)

2-4. Safety information (Applicable for ATEX/IECEx)
Observe the followings to maintain an explosion-proof system.
<Overseas Specifications>
Outline of the product This product is a portable explosion-proof gas detector that measures the concentration of
combustible gas and oxygen in crude oil vapors, etc. in inert gases or atmosphere.
 Gases are drawn by the built-in pump.
 As a power supply, either Li-ion battery unit (BUL-8000(R), BUL-8000(R1)) can be used.
 The battery unit can be replaced by users.
Technical data
Explosion-proof
Explosion-proof class Ex ia IIC T4 Ga
specifications
II 1 G Ex ia IIC T4 Ga
Ambient temperature -20 °C - +50 °C
Ambient temperature 0 °C - 40 °C(for charging)ElectricalPower supply About lithium ion battery unit (BUL-8000(R),specifications
BUL-8000(R1))
Two Lithium ion cells of BP-8000 (Maxell
INR18650PB1 or SDI INR18650-15M or SONY
US18650VT3. Um = 250 V) are connected in parallelto the Lithium ion battery unit.
 Maxell CR1220 battery is used for backup.
Certificate
IECEX
IECExDEK13.0091
numbers
ATEX
DEKRA13ATEX0228
Applied
IEC60079-0:2017
standards
IEC60079-11:2011
EN IEC 60079-0:2018
EN60079-11:2012
Precautions
 Do not charge the Lithium ion battery unit in ahazardous location.
 Charge the Lithium ion battery unit using thededicated charger.
 Do not replace the battery unit in a hazardous
location.
 Do not modify or change the circuit or structure, etc.
 Use Lithium ion battery unit (BUL-8000(R),BUL-8000(R1)).
INST.No.0 0 000 0000 00
How to read
instruction
AB C D E
number
A: Manufacturing year (0-9)
B: Manufacturing month (1-9, XYZ for Oct.-Dec.)
C: Manufacturing lot
D: Serial number
E: Manufacturing code
Manufacturer
RIKEN KEIKI CO., LTD.
2-7-6 Azusawa, Itabashi-ku, Tokyo, 174-8744 JapanWeb site: https://www.rikenkeiki.co.jp/-9-RX-8000

3 Product Components

3-1. Main unit and standard accessories

3

Product Components
3-1. Main unit and standard accessories
After opening the package, check the main unit and accessories.
If anything in the following list is not included, contact RIKEN KEIKI.
<Main Unit>
RX-8000
main unit

Li-ion battery
unit<Standard Accessories> AC powered charger
 Gas sampling probe
and gas sampling hose
 Filter tube(CF-8385)
 Relay tube
 Shoulder strap Filter tube fixing belt
 Operating manual Product warranty

:1
:1
:1
:1
:1
:1

DANGER< About explosion-proof > Do not modify or change the circuit or structure, etc.
 When measuring the oxygen concentration, do not measure anything but a mixture of air andcombustible gases or vapors and toxic gases.
 When using this gas detector in a hazardous area, take the following countermeasures forpreventing dangers resulting from electrostatic charges.
(1) Wear anti-static clothes and conductive shoes (anti-static work shoes).
(2) For indoor use, use the gas detector while standing on a conductive work floor (with aleakage resistance of 10 MΩ or less).
 IP protection class: IP20
* IP20 is a protection class on explosion-proof certification. The IP protection class is compliant
to IP67 level by factory default.
< About explosion-proof of the main unit > The battery units that can be connected are the BUL-8000(R)(TC20784), BUL-8000(R1)(TC21112).
The use with unspecified battery units deviates from the range of explosion-proof certification.

RX-8000- 10 -

3 Product Components

3-1. Main unit and standard accessories

DANGER The specifications of the gas detector are as follows:
Pump circuit: Allowable voltage of 4.95 V, allowable current of 1.12 A, andallowable power of 1138 mW
Toxic gas sensor circuit : Allowable voltage of 4.95 V, allowable current of 0.834 A, andallowable power of 853 mW
Buzzer circuit: Allowable voltage of 4.95 V, allowable current of 0.431 A, andallowable power of 441 mW
Main circuit: Allowable voltage of 4.95 V, allowable current of 0.717 A, andallowable power of 733 mW
Backup circuit: 3.0 VDC, 10 µA
Ambient temperature: -20 °C - +50 °C< About explosion-proof of the battery unit > The main unit that can be connected is RX-8000(TC20782) only.
The use with unspecified main units deviates from the range of explosion-proof certification.
 The specifications of the BUL-8000(R), BUL-8000(R1)(TC21112) are as follows:
Pump circuit: Maximum voltage of 4.25 V, maximum current of 1.12 A, andmaximum power of 901 mW
Infrared detection circuit : Maximum voltage of 4.25 V, maximum current of 0.768 A, andmaximum power of 618 mW
Buzzer circuit:
Maximum voltage of 4.25 V, maximum current of 0.410 A, andmaximum power of 330 mW
Main circuit: Maximum voltage of 4.25 V, maximum current of 0.653 A, andmaximum power of 526 mW
Battery charging contact : Allowable current of 250 VAC
Ambient temperature: -20 °C - +50 °C
 Do not attach and remove the battery unit in a hazardous location.

NOTE

 There are the following two combinations of battery units. The
following information is printed on the battery unit for the sake ofidentification to prevent a mistake in combinations.
Lithium ion battery unit : BUL-8000(R)(TC20784)
BUL-8000(R1)(TC21112)
 Additionally, a nameplate indicating a compatible model is affixed
on the top of the battery unit.
Check this information and use a correct
Printing for
combination.
identification- 11 -

RX-8000

3 Product Components

3-2. Names and functions for each part3-2. Names and functions for each part
<Main Unit>(1) LCD display(3) Alarm LED arrays(4) Infrared communication port

(2) Buzzer soundopening(3) Alarm LED arrays(3) Alarm LED arrays(7) PEAK/ESC switch(5) ▲/AIR switch(8) POWER/ENTER switch(6) ▼/PUMP switch(10) Gas outlet(2) Buzzer sound opening(9) Gas inlet(11) Recharging jack cover(12) Recharging indicator lamp(13) Battery unit screws

Name

Function(1)

LCD display

Displays gas concentrations, alarms, etc.

(2)

Buzzer sound opening

Emits a buzzer sound at an alarm. (Do not block it.)(3)

Alarm LED arrays

The lamp blinks in response to an alarm.

(4)

Infrared communication port

(5)▲/AIR switch(6)▼/PUMP switch

Turns on and off the pump. It is used to decrease numerical values.

(7)

PEAK/ESC switch

Press this switch to change between display modes.

(8)

POWER/ENTER switch

Turns on and off the power.

(9)

Gas inlet

Connect a sampling hose to this port.

(10)

Gas outlet

Exhausts the gas drawn into the gas detector. (Do not block it.)(11)

Recharging jack cover(12)

Recharging indicator lamp

(13)

Battery unit screws

RX-8000

Used to carry out data communications with a PC in data logger
mode.
Keep this switch pressed to perform fresh air calibration. It is used
to increase numerical values.

Remove this cover to connect an AC powered charger andrecharge the batteries.
Lights up in red during recharging and goes off when recharging iscompleted.
Turn these screws to detach and replace the battery unit.

- 12 -

3 Product Components

3-2. Names and functions for each part

CAUTION Do not jab the buzzer opening with a sharp-pointed item. The unit may malfunction or getdamaged, allowing water or foreign matter, etc. to get inside.
 Do not remove the panel sheet on the display. The water-proof and dust-proof performances will
be deteriorated.
 Do not affix a label on the infrared port. Infrared communications can no longer be conducted.

< LCD Display >(1) Pilot indicator(4) Pump driving
indicator(5) Oxygen
concentration
digital and bar(2) Combustible gas
concentration
digital and bar display(3) Battery level icon
Name

Function(1)

Pilot indicator

Displays the operating status in the detection mode. Normal: Blinking(2)

Combustible gas
concentration
digital and bar display

Displays the gas concentration as a numeric value and a level in the bar
graph.

(3)

Battery level icon

Displays the battery level. See the information below for the meanings ofbattery level icons.

(4)

Pump driving indicator

Displays the drawing status in the detection mode. Normal: Rotating(5)

Oxygen concentration
digital and bar display

Displays the gas concentration as a numeric value and a level in the bar
graph.

NOTE
The meanings of battery level icons are as follows:
Sufficient /

:Low

/

:Needs charging

If the battery level is lower than the above, the inside of the battery icon starts to blink (

).

NOTE

 The gas alarm function is an optional setting.
 When [NO ALARM] lights up, no gas alarm pattern is performed.
[NO ALARM] display- 13 -

RX-8000

4 How to use

4-1. Before using the gas detector

4

How to Use
4-1. Before using the gas detector
Not only the first-time users but also the users who have already used the product must follow the operating
precautions.
Ignoring the precautions may damage the gas detector, resulting in inaccurate gas detection.

4-2. Preparation for start-up
Before starting gas detection, read and understand the following precautions. Ignoring these precautions
may prevent correct gas detection.
Check that the main unit, relay tube, filter tube, gas sampling hose, and gas sampling probe are connected
properly in this order.
 Check that the battery level is sufficient.
 Check that the filter and filter tube in the gas sampling probe are free of dust or clogging.
 Check that there is no bend or hole in the gas sampling hose and relay tube.

< Recharging of Batteries >(when the Li-ion battery unit BUL-8000(R), BUL-8000(R1) are used)
When the gas detector is used for the first time, or when the battery level is low, be sure to use theaccessory AC powered charger to charge the batteries.






CAUTION

Use the dedicated AC powered charger.
Charge the battery unit in a non-hazardous area.
Charge the battery unit at ambient temperatures between 0 °C - 40 °C.
Do not use the gas detector while charging it. Correct measurements cannot be obtained.
Furthermore, the batteries get deteriorated more quickly and may have shorter life.
 The charger is neither water-proof nor dust-proof. Do not recharge the batteries while the gas
detector is wet.
 The AC powered charger is not explosion-proof.

- 14 -

RX-8000

4 How to Use

4-2. Preparation for start-up(1) Open the charging jack cover of the gas detector.

CAUTION
Do not pull the charging jack cover too hard. It may getdamaged.

Insert the plug of the AC
powered charger into therecharging jack.

Recharging
jack

Plug

(2) Put the plug of the AC powered charger into the recharging
jack of the gas detector.
AC powered(3) Connect the AC powered charger to the wall electric outlet.
charger
When charging is started, the charging indicator lamp lights up(red).
(Charging time: Three hours at the maximum until thebatteries are fully charged)(4) When charging is completed, the charging indicator lamp goes off.
(5) When charging is completed, disconnect the AC powered charger from the wall electric outlet.
(6) Pull out the AC powered charger plug from the power jack of thegas detector and reattach the recharging jack cover. Put the
charging jack cover as far as it will go.

CAUTION Do not use the gas detector with the recharging jack cover detached. Dust or water may get into
the gas detector, causing it to malfunction. Replace the charging jack cover if it is damaged.
 If the charging jack cover is not completely closed, water may get in from the power jack. The
same thing occurs if a minute foreign substance is caught beneath the knob.
 Disconnect the AC powered charger from the wall electric outlet while it is not in use.

NOTE

 During recharging, the battery pack may get hot, but this is not an abnormality.
 The temperature of the gas detector is high immediately after charging is completed. Allow at least 10
minutes or more for the unit to cool down before using it. Otherwise, correct measurements may not be
obtained.
 When fully recharged batteries are recharged again, the recharging indicator lamp does not go on.

- 15 -

RX-8000

4 How to Use

4-2. Preparation for start-up<Connection of Gas Sampling Probe and Gas Sampling Hoses>
Attach the gas sampling hose to the gas sampling probe.

 Connect the relay tube, filter tube, gas sampling hose, and gas sampling probe in this order securely to
the gas inlet (GAS IN) of the main unit.

NOTE
Connect each part, such as to the gas inlet (GAS IN), until itclicks into place to ensure connection.

CAUTION Use only a gas sampling hose specified by RIKEN KEIKI.
 Use the gas detector with the gas sampling probe connected so that no foreign substance isdrawn into it.
 Connect a gas sampling probe and a gas sampling hose by fastening them manually without
using any tool. If they are fastened too tightly using a tool, the plastic part of the gas samplingprobe may be broken.

RX-8000- 16 -

4 How to Use

4-3. Basic operating procedures

4-3. Basic operating procedures
Normally, the detection mode is used for normal operations. (The detection mode is activated after the
power is turned on.)<<Detection Mode>>
LCD

AIR (long pressing)<<Fault Alarm Status>><<Air Calibration Mode>>(Self-latching)▼+▲ (long pressing)

PEAK+▲<<Span Calibration Mode>><<Manual Memory Mode>>

PEAK<<Display/Setting Mode>>

PUMP (long pressing) : Stop operation
PUMP (short pressing) : Resumeti<<Pump ON/OFF Setting>>- 17 -

RX-8000

4 How to Use

4-4. How to start the gas detector

4-4. How to start the gas detector
Keep the POWER switch pressed for three seconds or more to turn on the power.
After the display automatically switches between Date/Time, Battery Voltage, and others and self diagnosis
is conducted, the gas detector enters the detection mode.
<<Start-up Procedure>>
Keeping the POWER switch
pressed for three seconds or
more↓
LCD display* Keep it pressed until the alarm
lamp lights up and the buzzer
sounds once (Beep).

All LCDs Light Up.

↓
Date/Time Display↓
Battery Voltage Display↓
Gas Name Display↓
Full Scale Display↓
ID Display↓

RX-8000- 18 -

4 How to Use

4-4. How to start the gas detector↓
Checking connection of filters
After checking the connection offilters, press the ENTER switch.

↓* Until confirmed, the confirmation
screens are displayed in turn as
shown in the above picture.

Warm-upWarm-up is performed for about
30 seconds.
The number displayed in thecenter of the screen starts
counting down.

↓* The buzzer sounds twice (Beep,beep).

Detection Mode

CAUTION
After start-up, perform air calibration before performing gas detection (See ʻ4-7. Air calibrationmodeʼ).

NOTE A sensor abnormality alarm is issued before the detection mode is entered if there is any abnormality
in the sensor. Press the ▼ switch. This will reset the sensor abnormality alarm temporarily, set the gas
concentration display that was abnormal on the sensor to [---], and start gas detection. However, notify
the abnormality to RIKEN KEIKI promptly. Gas for which there was an abnormality in the sensor
cannot be detected. However, the alarm cannot be reset if there is an abnormality in all the sensors.
 If there is an abnormality in the built-in clock, a fault alarm [FAIL CLOCK] may be issued. Press the ▼switch. The fault alarm is temporarily reset, and measurement is started with incorrect clock time.

NOTE
At a low temperature, the pump may need to be warmed up.
In this case, the screen will be as shown on the right after the battery voltage isdisplayed (Max 60 seconds).

- 19 -

RX-8000

4 How to Use

4-5. How to detect

4-5. How to detect
In the detection mode, put the gas sampling probe close to the detection area and take the reading on thedisplay.
<- Display example
HC concentration: 0.0 %LEL
O2 concentration: 20.9 %Battery level: Sufficient* HC: The acronym of HydroCarbons. In this gas
detector, combustible gas concentration isdisplayed in isobutane conversion.

DANGER While conducting measurement in a manhole or confined space, do not lean over or look into the
manhole or closed space. It may lead to dangers because oxygen-deficient air or other gases
may blow out.
 Oxygen-deficient air or other gases may blow out from the gas exhausting outlet. Never inhale
the air or gases.
 High-concentration (more than LEL) gases may blow out. Never use fire near the gas detector.
 When measuring the oxygen concentration, do not measure anything but a mixture of air andcombustible gases or vapors and toxic gases.

WARNING The gas detector is designed to draw gases around it under the atmospheric pressure. If
excessive pressure is applied to the gas inlet and outlet (GAS IN, GAS OUT) of the gas detector,
detected gases may leak out from its inside and may cause dangerous conditions. Be sure that
excessive pressure is not applied to the detector while used.
 Do not connect the sampling hose directly to a location with a pressure higher than theatmospheric pressure. The internal piping system may be damaged.
 When the fresh air adjustment is performed in the atmosphere, check the atmosphere forfreshness before beginning the adjustment. If other gases exist, the adjustment cannot be
performed properly, thus leading to dangers when the gas leaks.
 Issuance of a gas alarm indicates that there are extreme dangers. Take proper actions based onyour judgment.
 Before use, check that there remains sufficient battery power. When the gas detector is used forthe first time or is not used for a long period, the batteries may be exhausted. Either fully charge
the batteries or replace them with new ones before use.
 If a low battery alarm occurs, gas detection cannot be conducted. If the alarm is triggered duringuse, turn off the power and promptly charge the batteries in a non-hazardous area.
 Do not block the buzzer sound hole. No alarm sound can be heard.

RX-8000- 20 -

4 How to Use

4-5. How to detect

CAUTION Before performing gas detection, attach the gas sampling probe provided with the gas detector
to prevent disturbances by air dust.
 When you measure concentrations of oxygen in inert gases for a long time, the carbon dioxide
concentration in the air must be 15 % or less. When you use the gas detector in the inert gas witha carbon dioxide concentration of 15 % or higher, perform measurement in as short time as
possible. Using the gas detector under high concentrations for a long time may shorten the life of
the oxygen sensor.

NOTE

 In a low-temperature environment, the operating time is shortened due to the battery performance
property.
 At a low temperature, the response of the LCD display may get slow down.
 If a combustible gas with a higher concentration than %LEL is drawn, some gas may remain in the gas
sampling hose due to adsorption in the hose, gas sampling probe, etc. After drawing ahigh-concentration combustible gas, clean the gas detector to remove the adsorbed gas (draw fresh
air and check that the reading becomes zero).
Performing fresh air calibration before cleaning it completely will result in inaccurate adjustment, giving
adverse influence on measurement. In such a case, remove the gas sampling hose before performing
fresh air calibration to avoid inaccurate adjustment.

NOTE<About Range Switching Point>
The display automatically switches to the vol% range when the concentration of a detected combustible
gas exceeds 100 %LEL. When the concentration drops, the display returns to the %LEL range again. The
following shows an example of switching timing.
Diagram example of gas concentrations and range switching timing
HC / CH4
concentration

100 %LEL(HC:1.3 vol%)(CH4 4.4 vol%)%LEL range

vol% range

Switching point%LEL range

Switching point* HC: The acronym of HydroCarbons. Because combustible gas concentration is displayed in isobutane orCH4 conversion in this detector, the range switching point is LEL 1.3 vol% of isobutane or 4.4 % of
methane respectively.

- 21 -

RX-8000

4 How to Use

4-6. Modes

4-6. Modes
Details on each mode are provided as follows.
Mode
Detection Mode-LCD display
Concentration display

Details
Normal state

Air Calibration
Mode-[AIR CAL]

Performs the zero adjustment.

Display andSetting ModePeak Display[PEAK]

Displays the maximum concentration (orminimum concentration for oxygen
display) detected during measurementfrom power-on to the present.

Full Scale
Display/Alarm
Setpoint
Display/Alarm
Test[Optional
Setting]
Clock Display[ALARM-P]* The gas alarm function is an optionalsetting.

ID Display[ID]

Displays an ID if it has been set inadvance. Also used to change or set anID.

Log Data
Display[REC.DATA]

Displays data recorded to the manual
memory.

Pump OFF
Mode-[PUMP OFF]

Used to turn on/off the pump operations.

Manual Memory
Mode-[REC.DATA]

Any instantaneous value can berecorded.

RX-8000

Item

Displays the current time.

- 22 -

4 How to Use

4-7. Air calibration mode

4-7. Air calibration mode
Detection Mode
Keep the AIR switch
pressed.

When the AIR switch is keptpressed, the display
changes to [AdJ HOLD AIR].

↓↓

When [RELEASE] isdisplayed, release the AIR
switch.

Detection Mode
When the air calibration is
successfully completed, it
returns to the detection
mode.

↓

↓

WARNING

When the air calibration is performed in the atmosphere, check the atmosphere for freshness before
beginning the air calibration. If other gases exist, the adjustment cannot be performed properly, thus
leading to dangers when the gas leaks.

CAUTION Perform air calibration under pressure and temperature/humidity conditions close to those in theoperating environment and in fresh air.
 Perform air calibration after the reading is stabilized.
 If there is a sudden temperature change of 15 ℃ or more between the storage and operation
locations, turn on the power of the gas detector, let it leave for about 10 minutes in a similar
environment to the operation location, and perform air calibration in fresh air before using it.

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RX-8000

4 How to Use

4-7. Air calibration mode

NOTE If the air calibration fails, [FAIL AIR CAL] is displayed along with the name ofgas sensor which has become faulty.
 Press the ▼ switch to reset the fault alarm (calibration failure). In this case,the value before calibration is displayed.

If HC sensor is faulty

RX-8000- 24 -

4 How to Use

4-8. Display/setting mode

4-8. Display/setting modeThis mode allows you to change various displays and settings.
Every time the PEAK switch is pressed, various screens are displayed in turn.

NOTE
The gas detector automatically returns to the detection mode in about 20 seconds if the gas detector is left
unoperated.
LCD display
Detection Mode↓↓
Display/Setting ModePeak Display
Displays the maximum
concentration (or minimum
concentration for oxygen) detectedduring measurement from power-on
to the present.

↓* The gas alarmfunction is an
optional setting.

Full Scale Display/Alarm Setpoint
Display/Alarm Test [Optional setting]↓
Clock Display↓
ID Display/Selection
Displays an ID if it has beenregistered in advance. Also used to
select an ID.

→
ENTER
switchID Display/Selection=> P27→ENTER
switchLog Data Display=> P28↓
Log Data Display
Displays concentration data
recorded to the manual memory.

↓
To Detection Mode

- 25 -

RX-8000

4 How to Use

4-8. Display/setting mode

<ID Display/Selection [ID SELECT]>
Display and select an ID that has been registered in advance.
(1) Press the PEAK switch and select the ID display/selection from the display/setting mode menu.
The following screens are displayed in turn on the gas detector.

(2) Press the ENTER switch to set or select an ID.

NOTE

 If you do not want to set or select an ID, press the ESC switch to return to the display/setting modemenu.
 On the gas detector, either of the IDs from ST-ID000 to ST-ID127 has been registered, unlessotherwise specified.
 The data logger management program (option) is required to register or change an ID. Please contact
RIKEN KEIKI.
(3) Press either the ▲ or ▼ switch to select an ID.
Every time the ▲ or ▼ switch is pressed, the ID number increases or decreases (000 - 127).

Display example(4) Press the ENTER switch.
(5) When [END] is displayed, the setting is completed.

The display/setting mode menu is displayed again.
(6) After completion, press the PEAK switch several times until it returns to the detection mode.

RX-8000- 26 -

4 How to Use

4-8. Display/setting mode

<Log Data Display [REC.DATA]>
Display concentration data recorded to the manual memory.
(1) Press the PEAK switch and select the log data display from the display/setting mode menu.
The following screens are displayed in turn on the gas detector.

(2) Press the ENTER switch to display the log data.

NOTE

If you do not want to display the log data, press the ESC switch to return to the display/setting mode menu.

(3) Every time the ▲ or ▼ switch is pressed, the log data menus are displayed in turn.
Press either the ▲ or ▼ switch to select log data that you want to check. The log data menu displays theyear, month, day, time, and memory number.

Display example(4) Press the ENTER switch to display the selected log data.

Display example(5) If you want to display other log data, press the ENTER switch to return to the log data menu. Repeat thesteps (3) - (5).
(6) After completion, press the PEAK switch several times until it returns to the detection mode.

- 27 -

RX-8000

4 How to Use

4-9. Pump OFF mode

4-9. Pump OFF modeThis mode allows you to stop the pump operation only.
Detection Mode
Keep the PUMP switch
pressed for about threeseconds to stop the pump
operation only.

↓↑
Pump OFF Mode
Only the pump operation is
stopped.
Press the PUMP switch
shorty to resume the pump
operation.

WARNING When [PUMP OFF] is set, no alarm is triggered whatever happens.
 The gas detector does not automatically return to the detection mode if [PUMP OFF] is set.

NOTE

When the pump operation is stopped, the buzzer sounds twice (beep, beep) about every three minutes.

RX-8000- 28 -

4 How to Use

4-10. Manual memory mode

4-10. Manual memory mode
Any instantaneous value during measurement can be recorded.
Up to 256 points of data can be recorded. When the number of recorded data points reaches the maximum,
recorded data will be overwritten, starting from the oldest data.
(1) In the detection mode, press the PEAK and ▲ switches simultaneously for about a second to enter the
manual memory mode. The following screens are displayed in turn on the gas detector.

NOTE

 The screen displays the memory number, date, and instantaneous value in turn. Go to the next step toexecute recording. No value is recorded at this point yet. If you do not want to record a value, press the
ESC switch to return to the detection mode.
 If the Display and Setting Mode or Air Calibration Mode screen is displayed because the timing ofpressing the PEAK and ▲ switches is off, release the both switches and then try again.
(2) Press the ENTER switch. The date and the instantaneous value at the time when the ENTER switch ispressed are recorded.
(3) When [END] is displayed, the recording is completed.

It automatically returns to the detection mode.

- 29 -

RX-8000

4 How to Use

4-11. How to exit

4-11. How to exit
Make the gas detector draw in fresh air. After the display returns to zero (or 20.9 % for oxygen), keep the
POWER switch pressed until the power is turned off.

NOTE
If the display is not zero when the power is turned off, a purge operation may be
performed for 30 seconds at the maximum to clean the inside of the gas
detector.

RX-8000- 30 -

5 Operations and Functions

5-1. Fault alarm pattern

5

Operations and Functions
5-1. Fault alarm patternFault alarm: Triggered when an abnormality is detected in the gas detector. <<Self-latching>>
Alarm display: Notifies by display of error messages, sounding of the buzzer, and lighting of the lamp.
Alarm types: Low flow rate, sensor abnormality, battery voltage low, system abnormality, and calibration
failureDetermine the causes and take appropriate actions.
If the gas detector has problems and is repeatedly malfunctioning, contact RIKEN KEIKI immediately.

<Display Operation>
LCD display

Displays an error message.

Alarm lamp

Repeatedly blinks at about one second intervals.

BuzzerRepeatedly sounds intermittent beeps at about
one second intervals:
Blip, beep, blip, beep

Display example

CAUTION When in [FAIL LOW FLOW], the pump stops working for pump protection.
 To reset a low flow rate alarm ([FAIL LOW FLOW]), remove the cause of the low flow faik, andthen press the RESET switch. In case pushing RESET swithch without removing cause of the
low flow fail, the pump re-start working and water or other material might be sucked insidedetector.

NOTE For information on malfunctions (error messages), see '8. Troubleshooting'.

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RX-8000

5 Operations and Functions

5-2. Other functions

5-2. Other functions<Calibration History/Various Trend/Event History Functions>
The gas detector has history and trend functions. To use these functions, please contact RIKEN KEIKI.

NOTE

The data logger management program (option) is required to use the history and trend functions. Please
request RIKEN KEIKI.

RX-8000- 32 -

6 Maintenance

6-1. Maintenance intervals and items

6

Maintenance
The gas detector is an important instrument for the purpose of safety.
To maintain the performance of the gas detector and improve the reliability of safety, perform a regular
maintenance.

6-1. Maintenance intervals and items

 Daily maintenance: Perform maintenance before beginning to work.
 Monthly maintenance: Perform alarm test once a month.
 Regular maintenance: Perform maintenance once or more every six months to maintain theperformance as a safety unit.
Maintenance
item
Battery level
check
Concentration
display check

Maintenance content

Check that the battery level is sufficient.

Make the gas detector draw in fresh air. Check thatthe concentration display value is zero (or 20.9
vol% on the oxygen deficiency meter). When thereading is incorrect, perform the air calibration
after ensuring that no other gases exist around it.
Flow rate check See the flow rate indicator to check for
abnormalities.
Filter check
Check the dust filter for dust or clogging.
Span adjustment Perform the span adjustment by using thecalibration gas.

Daily
maintenanceMonthly
maintenance

Regularmainten
ance

○

○

○

○

○

○

○

○

○

○

○

○

-

-

○

<About Maintenance Services> We provide services on regular maintenance including span adjustment, other adjustments andmaintenance.
To make the calibration gas, dedicated tools, such as a gas cylinder of the specified concentration andgas sampling bag must be used.
Our qualified service engineers have expertise and knowledge on the dedicated tools used for services,along with other products. To maintain the safety operation of the indicator/alarm unit, please use ourmaintenance service.
 The followings are typical maintenance services. For details, please contact RIKEN KEIKI.

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RX-8000

6 Maintenance

6-1. Maintenance intervals and items

Main services
Battery level
check
Concentration
display check:

Checks the battery level.

:

Flow rate check:

Filter check:

Span adjustment
Cleaning andrepair of device(visualdiagnosis)
Device operation
check
Replacement ofconsumable
parts

:
:

Verifies that the concentration display value is zero (or 20.9 vol% on the oxygen deficiency
meter) by using the zero gas.
Performs the air calibration if the reading is incorrect.
Checks the flow rate indicator to find abnormalities.
Checks the flow rate by using an external flow meter to verify the correctness of the flow rate
indicator on the gas detector. If the flow rate is incorrect, performs the flow rate adjustment.
Checks the dust filter for dust or clogging.
Replaces a dirty or clogged dust filter.
Performs the span adjustment by using the calibration gas.
Checks dust or damage on surface of the gas detector, cleans and repairs such parts of thegas detector.
Replaces parts which are cracked or damaged.

RX-8000:

Uses the keys to check the operation of functions and parameters.

:

Replaces consumable parts, such as a sensor, filter and pump.

- 34 -

6 Maintenance

6-2. Gas calibration

6-2. Gas calibration
Perform span adjustment of sensors using a calibration gas at least once every six months.
The span adjustment requires dedicated equipment and a calibration gas. Request RIKEN KEIKI for it.

<Required Equipment/Material> Calibration gas (low-concentration combustible gas for %LEL and high-concentration combustible gas
for vol%) Calibration gas (nitrogen gas for O2)
 Set of gas sampling bags (for %LEL and vol%) Set of gas sampling bags (for O2)<Connection>
Connect the equipment as shown below to perform the span adjustment.

GAS INGas
samplingbag

Main unit
RX-8000
GAS OUT

Exhasut booth or collect gas with sampling bag.

WARNING
About the span gas
The span gas is a hazardous gas (combustible, toxicity, oxygen deficient, etc.). Handle the gas andrelated jigs and tools with due care.
* Inhaling the gas must be avoided, the gas sampling bag must be free of holes, etc.
About the place for span adjustment
 Perform span adjustment where no silicon, organic solvent, spray can gases, etc. is used.
 Perform span adjustment indoors at normal temperatures without remarkable fluctuation (within±5 °C).
 Perform span adjustment in an exhaust booth or collect exhaust gas with sampling bag.

CAUTION
The gas outlet (GAS OUT) must be left open without any pipe connected for atmosphere release.

- 35 -

RX-8000

6 Maintenance

6-2. Gas calibration<Span Adjustment>
Perform the span adjustment using the procedure shown below.
(1) Prepare the calibration gases (for %LEL, vol%, and O2) and a set of gas sampling bags.
(2) Remove the filter tube, gas sampling hose, etc. to allow the gas sampling bag to be directly connected to
the gas inlet (GAS IN).
(3) Check that the gas detector is in the detection mode.

Detection Mode
(4) Perform the air calibration. (See ʻ4-7. Air calibration modeʼ.)(5) Collect each calibration gas in each gas sampling bag.
(6) Press the ▲ and ▼ switches simultaneously for about a second to enter the span adjustment mode([ONE CAL]).

HC %LEL adjustment

HC vol% adjustment

O2 adjustment

ESCAPEWARNING
After the adjustment is completed, do not forget to return to the detection mode.
(If the monitor remains in the regular maintenance mode, it does not automatically return to thedetection mode.)

NOTE If the Air Calibration Mode screen is displayed because the timing of pressing the ▲ and ▼ switches isoff, release the both switches and then try again.
 In the span adjustment mode, select the concentration display that can be adjusted with the ▲ or ▼switch.
 Press the ESC switch to abort the running operation.
 To return from the span adjustment mode to the detection mode, select [ESCAPE] and then press the
ENTER switch.

RX-8000- 36 -

6 Maintenance

6-2. Gas calibration(7) Use the ▲ or ▼ switch to select [HC %LEL].
Press the ENTER switch to enter the HC %LEL span adjustment mode. * The concentration display
blinks.

(8) Connect the gas sampling bag in which the %LEL calibration gas was collected to the gas inlet to supply
the gas to the gas detector. Wait for the concentration display value to be stabilized.
(9) When it is stabilized, adjust the concentration display value to calibration gas concentration value bypressing the ▲ or ▼ switch. Press the ENTER switch to confirm it. When [END] is displayed, the
HC %LEL span adjustment is completed. Remove the gas sampling bag.

(10) Then, use the ▲ or ▼ switch to select [HC vol%].
Press the ENTER switch to enter the HC vol% span adjustment mode. * The concentration display
blinks.

(11) Connect the gas sampling bag in which the vol% calibration gas was collected to the gas inlet to supply
the gas to the gas detector. Wait for the concentration display value to be stabilized.
(12) When it is stabilized, adjust the concentration display value to calibration gas concentration value bypressing the ▲ or ▼ switch. Press the ENTER switch to confirm it. When [END] is displayed, the HC
vol% span adjustment is completed. Remove the gas sampling bag.

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RX-8000

6 Maintenance

6-2. Gas calibration(13) Then, use the ▲ or ▼ switch to select O2.
Press the ENTER switch to enter the O2 span adjustment mode. * The concentration display blinks.

(14) Connect the gas sampling bag in which the O2 calibration gas was collected to the gas inlet to supply
the gas to the gas detector. Wait for the concentration display value to be stabilized.
(15) When it is stabilized, adjust the concentration display value to calibration gas concentration value bypressing the ▲ or ▼ switch. Press the ENTER switch to confirm it. When [END] is displayed, the O2
span adjustment is completed. Remove the gas sampling bag.

(16) Use the ▲ or ▼ switch to select [ESCAPE].
Press the ENTER switch to return to the detection mode. Exit the span adjustment.

RX-8000- 38 -

6 Maintenance

6-3. How to clean

6-3. How to clean
Clean the gas detector if it becomes extremely dirty. The gas detector must be turned off while cleaning it.
Use a waste cloth to remove dust. Do not use water or organic solvent for cleaning because they may cause
malfunctions.
Because an extremely large amount of dust inside the gas sampling hose may disturb the gas detection, it
must be cleaned with dry air, etc.

CAUTION
When cleaning the gas detector, do not splash water over it or use organic solvents such as alcoholand benzene on it. The surface of the gas detector may be discolored or damaged.

NOTE
When the gas detector gets wet, water may remain in the buzzer sound opening or clearances. Drain
water as follows:(1) Wipe away moisture on the gas detector thoroughly using a dry towel, cloth, etc.
(2) While holding the gas detector firmly, shake it about ten times with the buzzer sound opening facing
downward.
(3) Wipe away moisture coming out from the inside thoroughly using a towel, cloth, etc.
(4) Place the gas detector on a dry towel, cloth, etc. and let it stand at normal temperatures.

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RX-8000

6 Maintenance

6-4. Parts replacement

6-4. Parts replacement<Replacement of Consumables>
Sensor Replacement
The built-in sensors of the gas detector have a validity period and must be replaced regularly (within oneyear).
The sensor life has expired if, for example, the sensors cannot be calibrated in span adjustment, thereadings do not come back after fresh air calibration, or the readings fluctuate. Request RIKEN KEIKI for
repair. Recommended replacement intervals are five years for the combustible gas sensor and one year forthe oxygen sensor.
Dust Filter Replacement Procedure
Because the dust filter may gradually get dirty or clogged over the time, it must be replaced regarding theoperating conditions. Check the dust filter, and then replace it as necessary.
Gas sampling probe
Because the dust filter may gradually get dirty or clogged over time, it must be replaced regularly according
to the operating conditions.
It must be replaced especially when it shows a sign of water absorption, low flow rate or contamination①

Rotate the end of the probe
counterclockwise and remove it.
A round dust filter is contained here.
Check it for contamination or clogging.
Replace the dust filter if it is contaminatedheavily or clogged.

②③

Take out the filter and replace it with newone.
Reattach the filter case.

NOTE Use only the filters specified by RIKEN KEIKI.

Dry cotton inside CF-8385 Replacement Procedure
AbsorbentDrycottencotton5 - 10 mm

1) Cut dry cotton with the size listed left.
(Weight approx. 1.3 g)

70±3 mm

85 - 90 mm
Cap(Black color)2) Loosen and remove the cap.
3) Replace dry cotton to new one, and fill .
the interspace with dry cotton

Pipe4) Tighten the cap again.

RX-8000- 40 -

Absorbent cotton

6 Maintenance

6-4. Parts replacement

Water proof filter Replacement Procedure(1) Loosen the cap(black color).
Cap(Black color)(2)

Remove the filter and replace to new one.

Joint

O-ring(3) Tighten the cap again.
FilterMesh side should be on
O-ring side.
Cap(Black color)<Replacement of Regular Replacement Parts>
List of recommended regular replacement parts
Item
Maintenance Replacement
intervals
intervals
Internal filter

6 months

6 months
6 months

6 months 1 year
6 months 1 year
6 months 1 year
6 months 1 year
3 - 8 years
5 years

Dust filter(for the gas sampling probe)
Water-proof filter(10 pcs for filter tube)
Absorbent cotton(25 g for filter tube)
Tubes
Combustible gas sensor(DE-3123-4 / DE-3113-13)
Oxygen sensor (OS-BM1)
Pump unit (RP-11)
Rubber seals
Li-ion battery pack(for BUL-8000(R),BUL-8000(R1))

6 months

6 months
6 months-

1 year
1 - 2 years
2 years-

6 months
6 months

Quantity(pieces per
unit)
1Remarks*

1

Part number 4181 9573 101Part number 4777 9022 50

1.3 g

Part number 1879 0011 10

A set
1

*
*

1
1
A set
1

*
*
*
About 500 cycles ofcharging and discharging ** The operation must be checked after replacement by a qualified service engineer. For the stable
operation of the gas detector and safety, ask a qualified service engineer to take care of replacement of
the parts whose operation must be checked. Request RIKEN KEIKI for operation check.

NOTE
The above replacement intervals are recommendation only. The intervals may change depending on theoperating conditions. These intervals do not mean the warranty periods either. The result of the daily or
regular maintenance may determine when to replace the parts.

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RX-8000

7 Storage and Disposal

7-1. Procedures to store the gas detector or leave it for a long time7

Storage and Disposal
7-1. Procedures to store the gas detector or leave it fora long time
The gas detector must be stored under the following environmental conditions.
 In a dark place under the normal temperature and humidity away from direct sunlight In a place where gases, solvents or vapors are not present
Store the gas detector in a shipping carton, if any, in which the product was delivered.
Store the gas detector away from dust, etc. if the shipping carton is not available.

CAUTION
If the gas detector is not used for a long time, turn on the power at least once every six months andcheck that the pump draws in air (about three minutes). The gas detector, when not activated for along time, may cease to work because of hardening of the grease in the pump motor.

NOTE If the gas detector with a lithium ion battery unit is not used for a long time, it is recommended to store
it after discharging the batteries until the battery level icon shows one battery mark or so. If the gas
detector is stored with the batteries fully recharged, the batteries get deteriorated more quickly andmay have shorter life.

RX-8000- 42 -

7 Storage and Disposal

7-2. Procedures to use the gas detector again

7-2. Procedures to use the gas detector again
CAUTION
When you use a stopped or stored gas detector again, never fail to perform a gas calibration. For
information on readjustment including gas calibration, please contact RIKEN KEIKI.

7-3. Disposal of products When the gas detector is disposed of, it must be treated properly as an industrial waste in accordancewith the local regulations.

WARNING Do not disassemble the galvanic cell type sensor because it contains electrolyte. Electrolyte may
cause severe skin burns if it contacts skin, while it may cause blindness if its contacts eyes.
If electrolyte is adhered on your clothes, that part on your clothes is discolored or its material isdecomposed. If contact occurs, rinse the area immediately with a large quantity of water.
 Dispose the batteries in accordance with procedure specified by the local authority.

 When disposing of the gas detector in EU member states, sort the batteries as specified. Handle theremoved batteries according to the classified refuse collection system and recycling system based on
the regulations of EU member states.
Contact RIKEN KEIKI for disposal.
Removing batteries
See '4-2. Preparation for start-up' and take out the batteries.
For BUL-8000(R), BUL-8000(R1)
Model
BUL-8000(R)
BUL-8000(R1)Type
Lithium ion battery

NOTE

 BUL-8000(R), BUL-8000(R1) contains batteries.
 Crossed-out recycle dustbin markThis symbol mark is indicated on the products which contain the batteries which fall under EU Battery
Directive 2006/66/EC. Such batteries need to be disposed of as specified by the latest Directive.
This symbol mark indicates that the batteries need to be separated from the ordinary waste and disposed ofappropriately.

- 43 -

RX-8000

8 Troubleshooting

7-3. Disposal of products8

Troubleshooting
The troubleshooting does not explain the causes of all the malfunctions which occur on the gas
detector. This simply helps to find the causes of malfunctions which frequently occur. If the gas
detector shows a symptom which is not explained in this manual, or still has malfunctions eventhough remedial actions are taken, please contact RIKEN KEIKI.

<Abnormalities on Unit>
Symptoms
The power cannot
be turned on.

CausesThe battery level is toolow.
The power switch was
not pressed longenough.
Improper installation of
the battery unit

Actions
Lithium ion battery unit: Charge the battery unit in a
non-hazardous area.
For power-on, keep the POWER switch pressed until a beepis heard (about two seconds).

Abnormaloperations

Disturbances by sudden
surge noise, etc.

Turn off and restart the indicator/alarm unit.

Key operations are
disabled.

Disturbances by sudden
surge noise, etc.

Systemabnormalities[FAIL SYSTEM]
Sensorabnormalities[FAIL SENSOR]

A circuit abnormality
occurred.

In a non-hazardous area, remove the battery unit once, andreinstall the battery unit, and turn on the power to perform
operations.
Request RIKEN KEIKI for repair.

A sensor has failed.

Request RIKEN KEIKI to replace the sensor.
(Only at power-on, press the RESET switch to continue theoperation using gas sensors except the sensor which has
failed.)A low battery
voltage alarm istriggered.
[FAIL BATTERY]
A low flow rate
alarm is triggered.
[FAIL LOW FLOW]The battery level is low.

Lithium ion battery unit: Turn off the power and charge thebattery unit in a non-hazardous area.

Water or oil, etc. wasdrawn in.

Check the gas sampling hose for any damage or mark ofdrawn water or oil, etc.

The gas sampling hose
is clogged.

Check the gas sampling hose for connections, clogging,twisting, etc.

The gas detector was
powered on at a lowtemperature or has notbeen used for a longtime.
The pump hasdeteriorated.

Turn on the power several times. The pump may start
operating.

Fresh air is not suppliedaround the gas detector.

Supply fresh air.

Air calibration
impossible[FAIL AIR CAL]
RX-8000

Check whether the battery unit is properly attached to themain unit.

Request RIKEN KEIKI to replace the pump.

- 44 -

8 Troubleshooting

7-3. Disposal of products

Clock
abnormalities[FAIL CLOCK]

Abnormalities of theinternal clock

The batteries
cannot berecharged.
(Lithium ion
battery unit only)

The charger is notconnected properly.
A charging circuit
abnormality occurred.
The batteries have been
fully charged.

Make a setting of Date/Time.
If such a symptom is observed repeatedly, the built-in clock
is seemingly malfunctioning. Thus, it must be replaced.
Request RIKEN KEIKI for replacement.
Connect the AC powered charger to the wall electric outlet
and jack properly.
Request RIKEN KEIKI for repair.
When fully charged batteries are charged again, thecharging indicator lamp does not go on.

<Abnormalities of Readings>
Symptoms
The reading rises(drops) and it
remains so.

CausesDrifting of sensor output
Presence of interferencegas
Slow leakEnvironmental changes

Slow response

Span adjustment
impossible

Clogged dust filter
Bended or clogged gas
sampling hose
Condensation is formed
inside the gas sampling
hose.
Deteriorated sensor
sensitivity
Improper calibration gas
concentration
Deteriorated sensor
sensitivity

Actions
Perform the air calibration.
Check if any interference gas, such as solvent, etc., ispresent and take an appropriate action.
A very small amount of the gas to be detected may beleaking (slow leak). Ignoring it may cause dangers.
Perform the air calibration.
In particular, the galvanic cell type is affected by the airpressure.
Replace the dust filter.
Fix the defective parts.
Fix the defective parts.

Replace the sensor with a new one.
Use the proper calibration gas.
Replace the sensor with a new one.

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RX-8000

9 Product Specifications

9-1. List of specifications

9

Product Specifications
9-1. List of specifications
Detection principle
Gas to be detected
Detection range<Service range>
Display resolution
Accuracy of thereading(under an identicalcondition)
Response time
(under an identicalcondition)
Concentration
display
Detection method
Suction flow rate
Displays
Buzzer soundvolumeFault alarm/self
diagnosis
Fault alarm display
Fault alarm pattern
Transmission
specifications
FunctionsPower supply
Continuous
operating time
Operatingtemperatures
Operatinghumidities
Structure
Explosion-proof
structure
Explosion-proof
class

RX-8000

Galvanic cell type
(OS)
Oxygen (O2)
0 - 25 vol%<to 40 vol%>0.1 vol%Within ±0.7 vol%Non-dispersive infrared type (RI)
Combustible gas (HC or CH4) *1
Isobutane (i-C4H10) *2
Methane (CH4)
0 - 100 %LEL (1.3 vol%) /0 - 100 %LEL (4.4 vol%) /to 100 vol%to 100 vol%0.5 %LEL (0 - 100 %LEL)/0.5 vol% (Up to 100 vol%)Within ±5 %LEL (0 - 100 %LEL)
Within ±5 vol% or ±10 % of the reading (Up to 100 vol%)90 % response:
90% response: within 30 seconds *3
within 20 seconds *3
90 % response:
90% response: within 2 minutes *4*4within 2 minutes
LCD digital (seven-segment + Symbol + Bar meter)
Pump suction type0.75 L/min or more (Open flow rate)
Battery level icon, pilot indicator, and pump operation status indicator
95 dB (A) or higher (30 cm)
System abnormalities, sensor abnormalities, battery voltage drop, calibration failure,
and low flow rate
Lamp blinking, intermittent buzzer sounding, and detail display
Self-latching
IrDA (for data logger)
LCD backlight, data logger, peak display, log data display, and pump stop
Dedicated lithium ion battery unit [BUL-8000(R), BUL-8000(R1)]
BUL-8000(R), BUL-8000(R1): About 15 hours (25 °C, no alarm, no lighting, andbattery fully charged)-20 - +50 °C
Below 95 %RH (Non-condensing)Drip-proof and dust-proof performances (compliant to IP67 level)
Intrinsically safe explosion-proof structure
II 1 G Ex ia IIC T4 Ga(ATEX)
Ex ia IIC T4 Ga(IECEx)- 46 -

9 Product Specifications

9-2. List of accessories
Approx. 154 (W)  81 (H)  127 (D) mm (projection portions excluded)

External
dimensions
WeightAbout 1.1 kg (when BUL-8000(R), BUL-8000(R1) is used)*1 Please refer to the table of correction factors for readings to other gases. The factory default setting iseither CH4 or HC (specified in the order).
*2 HC: The acronym of HydroCarbons. In this gas detector, combustible gas concentration is displayed in
isobutane conversion.
*3 When introducing the gas from the gas inlet of the main unit
*4 When introducing the gas from the tip of the gas sampling hose (30 m) (option)

9-2. List of accessories

Standard
accessories

Optional
accessories

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Lithium ion battery unit (BUL-8000(R), BUL-8000(R1)): 1 (Attached to the main unit)
AC powered charger: 1
Gas sampling probe and gas sampling hose: 1
Filter tube: 1
Relay tube: 1
Shoulder strap: 1
Filter tube fixing belt: 1
Operating manual
Product warranty
Waist strap
Waist strap fixing tool
Carrying case (leather)
Sampling probe holder
Aluminum trunk case
Shipboard storage box (metal: non-compliant Rohs )Gas sampling hose (with float probe, 8 m)
Gas sampling hose 30 m with plummet
Water trap filter
Relay tube
Filters for CF-8385 (10pcs / 1set)
Set of gas sampling bags (for %LEL/vol%)Span cans (supplying only for Japan Domestic )Demand flow valve
Replacement plug for AC adaptor (Europe round-type / UK-type / Australian-type)
Data logger management program
LCD protection film

WARNING
Please be sure to connect filter tube (CF-8385), when you use Gas sampling hose 30 m withplummet. It not, when in sucking water, water might go inside RX-8000 mainbody and cause thesystem trouble.

- 47 -

RX-8000

10 Definition of Terms

9-2. List of accessories

10

Definition of Terms
vol%
LEL

RX-8000

Gas concentration indicated in the unit of one-hundredth of the volume
The acronym of Lower Explosion Limit.
LEL refers to the lowest concentration of a combustible gas in air capable ofcausing explosion when ignited.

- 48 -

Revision or Abolition History
Edition

RevisionIssue date

0First issue

4/12/2021

1

Declaration of Conformity

10/29/2021

231-4. Method of confirmation for Standards and Explosion proof specification
added, 2-4. Safety information changed, CE Declaration of Conformitchanged, UKCA Declaration of Conformit added
UKEX deleted, CE Declaration of Conformit changed, UKCA Declaration ofConformit deleted

9/29/2023
6/14/2024

RX-8000