RKI Instruments GX-8000 User Manual

PT0E-0980

Portable Gas Monitor

GX-8000

Operating Manual

(PT0-098)

Request for the Customers

• Read and understand this operating manual before using the gas monitor.

• Use the gas monitor in accordance with the operating manual.

• Regardless of warranty period, we shall not make any compensation for accidents and

damage caused by using this product.

The compensation shall be made only under the warranty policy of products or parts
replacement.

• Because this is a safety unit, a regular maintenance for every six months and regular

maintenance must be performed.

• If any abnormality was found in the gas monitor, notify them to RIKEN KEIKI immediately.

Safety information

The Portable Gas Monitor Model GX-8000 is a gas monitor designed to provide continuous exposure
monitoring of combustible gas, oxygen (O2), toxic gas such as carbon monoxide (CO) and hydrogen sulfide
(H2S) in hazardous environments. The gas sample is sucked in by build-in micro pump.
The battery can be selected either Li-ion battery or alkaline dry battery.
Li-ion battery unit is called BUL-8000 and alkaline dry battery unit is called BUD-8000.
The battery unit can be changed even by the end users.

Specification for safety

・Ga Ex ia IIC T4

・ II 1 G Ex ia IIC T4

・Ambient temperature range for use ： -20°C to +50°C
・Ambient temperature range during battery charging ： 0°C to +40°C

Electrical data

・Power supply of Li-ion battery unit : BUL-8000
Two parallel connected Li-ion cells used in battery pack BP-8000 are from type Maxell
INR18650PB1. Um=250V.

・Power supply of alkaline battery unit : BUD-8000
Powered by three series AA size alkaline batteries , model LR6 by TOSHIBA.

・Backup battery type CR1220 manufactured by Maxell.

Certificate numbers

・IECEx Certificate number ：IECEx KEM 10.0038

・ATEX Certificate number ：KEMA 10ATEX 0085

List of standards

・IEC 60079-0：2004 ed.4.0 ・EN60079-0:2006

・IEC 60079-11：2006 ed.5.0 ・EN60079-11:2007

・IEC 60079-26：2006 ed.2 ・EN60079-26:2007

WARNING

・Do not charge in hazardous location.

・Do not charge it expect by genuine charger.

・Do not replace battery unit in hazardous location.

・Do not replace dry batteries in hazardous location.

・Do not attempt to disassemble or alter the instrument.

・Use only battery unit type BUD-8000 with three series connected Alkaline

AA batteries, type LR6 manufactured by Toshiba, or use chargeable battery unit
type BUL-8000.

INST. No. 0 0 0 0 0 0 0 0 0 0 0

A B C D E

A: Manufacturing year (0-9)
B: Manufacturing month (1-9,XYZ for Oct.-Dec.)
C: Manufacturing lot
D: Serial number
E: Code of factory

2-7-6 Azusawa, Itabashi-ku, Tokyo, 174-8744, Japan

Phone : [phone]

Fax : [phone] GIII

E-mail : [e-mail]

Web site : http://www.rikenkeiki.co.jp

<Contents>

1 Outline of the Product.............................................................................................. 4

1-1. Preface ....................................................................................................................4

1-2. Purpose of use ........................................................................................................ 4

1-3. Definition of DANGER, WARNING, CAUTION, and NOTE ..................................... 4

2 Important Notices on Safety .................................................................................... 5

2-1. Danger cases ..........................................................................................................5

2-2. Warning cases......................................................................................................... 6

2-3. Precautions ............................................................................................................. 7

3 Product Components............................................................................................... 9

3-1. Main unit and standard accessories ........................................................................ 9

3-2. Names and functions for each part.......................................................................... 10

4 How to Use.............................................................................................................. 13

4-1. Before using the gas monitor................................................................................... 13

4-2. Preparation for start-up............................................................................................ 13

4-3. Basic operating procedures..................................................................................... 18

4-4. How to start the gas monitor.................................................................................... 19

4-5. How to detect .......................................................................................................... 21

4-6. Modes......................................................................................................................25

4-7. Air calibration mode................................................................................................. 26

4-8. Display/setting mode ............................................................................................... 28

4-9. How to exit............................................................................................................... 35

5 Operations and Functions ....................................................................................... 36

5-1. Gas alarm activation................................................................................................ 36

5-2. Fault alarm activation .............................................................................................. 38

5-3. Other functions ........................................................................................................ 38

6 Maintenance............................................................................................................ 39

6-1. Maintenance intervals and items ............................................................................. 39

6-2. Gas calibration method............................................................................................ 40

6-3. How to clean............................................................................................................ 41

6-4. Parts replacement ................................................................................................... 41

7 Storage and Disposal .............................................................................................. 44

7-1. Procedures to store the gas monitor or leave it for a long time ............................... 44

7-2. Procedures to use the gas monitor again ................................................................ 44

7-3. Disposal of products................................................................................................ 45

8 Troubleshooting....................................................................................................... 46

9 Product Specifications ............................................................................................. 48

9-1. List of specifications ................................................................................................ 48

9-2. List of accessories................................................................................................... 50

10 Definition of Terms................................................................................................... 51

GX-8000 - 3 -

1 Outline of the Product 1-1. Preface

1

Outline of the Product

1-1. Preface

Thank you for choosing our portable gas monitor GX-8000. Please check that the model number of the
product you purchased is included in the specifications on this manual.

This manual explains how to use the gas monitor and its specifications. It contains information required for
using the gas monitor 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 gas monitor.

1-2. Purpose of use

This gas monitor is a multi gas type that enables simultaneous monitoring of all of the following five types of
gases at the maximum: oxygen, combustible gases, and toxic gases (carbon monoxide and hydrogen
sulfide) in the air and high-concentration combustible gases (vol%) in N2 and inert gases.
Detection results are not intended to guarantee life or safety in any way.

The gas monitor comes in several types for different combinations of gases to be detected. Check the
specifications of the gas monitor before use and conduct gas detection properly in accordance with
purposes. (See the list of gases to be detected at the end of this operating manual.)
In addition to this operating manual, an operating manual for the data logger management program (option)
is available for the gas monitor. Contact RIKEN KEIKI if it is needed.

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

NOTE

DANGER

WARNING

CAUTION

NOTE

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

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

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

This message indicates advice on handling.

GX-8000 - 4 -

2 Important Notices on Safety 2-1. Danger cases

2

Important Notices on

Safety

2-1. Danger cases

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 and

combustible gases or vapors and toxic gases.

• When using this gas monitor in a hazardous area, take the following countermeasures for
preventing dangers resulting from electrostatic charges.

(1) Wear anti-static clothes and conductive shoes (anti-static work shoes).
(2) For indoor use, use the gas monitor while standing on a conductive work floor (with a

leakage resistance of 10 MΩ or less).

• The battery units that can be connected are the BUL-8000(G) (certificate number TC19437) or
BUD-8000(G) (certificate number TC19438).

• The specifications of the gas monitor are as follows:

Pump circuit: Allowable voltage of 4.95 V, allowable current of 1.12 A, and

allowable power of 1138 mW

Combustible gas sensor circuit: Allowable voltage of 4.95 V, allowable current of 0.834 A, and

allowable power of 853 mW

Buzzer circuit: Allowable voltage of 4.95 V, allowable current of 0.431 A, and

allowable power of 441 mW

Main circuit: Allowable voltage of 4.95 V, allowable current of 0.717 A, and

allowable power of 733 mW

Backup circuit: 3.0 VDC, 10 µA

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 monitor.

- 5 - GX-8000

2 Important Notices on Safety 2-2. Warning cases

2-2. Warning cases

WARNING

Sampling point pressure

• The gas monitor 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 monitor,
detected gases may be leaked from its inside, thus leading to dangers. Be sure that excessive
pressure is not applied to the gas monitor while used.

• Do not connect the gas sampling hose directly to a location with a pressure higher than the
atmospheric pressure. The internal piping system may be damaged.

Handling of sensor
Do not disassemble the electrochemical type sensor or galvanic cell type sensor because they
contain electrolyte. Electrolyte may cause severe skin burns if it contacts skin, while it may cause
blindness if it contacts eyes.
If electrolyte is adhered on your clothes, that part on your clothes is discolored or its material is
decomposed. If contact occurs, rinse the area immediately with a large quantity of water.

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

Response to gas alarm
Issuance of a gas alarm indicates that there are extreme dangers. Take proper actions based on
your judgment.

Battery level check

• Before use, check that there remains sufficient battery power. When the gas monitor is used for

the first time or is not used for a long period, the batteries may be exhausted. Either fully
recharge the batteries or replace them with new ones before use.

• If a low battery voltage alarm occurs, gas detection cannot be conducted. If the alarm occurs

during use, turn off the power and promptly recharge the batteries in a non-hazardous area.

Others

• Do not throw the gas monitor into fire.

• Do not wash the gas monitor in a washing machine or ultrasonic cleaner.

• Do not block the buzzer sound opening. No alarm sound can be heard.

• Do not remove the battery unit while the power is ON.

GX-8000 - 6 -

2 Important Notices on Safety 2-3. Precautions

2-3. Precautions

CAUTION

Do not use the gas monitor where it is exposed to oil, chemicals, etc. Do not submerge the gas

monitor under water on purpose.

• Do not use in a place where the gas monitor is exposed to liquids such as oil and chemicals.

• The gas monitor, being compliant to IP67, is not water-pressure-resistant. Do not use the gas

monitor 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 monitor is water-proof only in fresh water and running
water, 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 use the gas monitor where water or dirt gets accumulated. The gas monitor placed at

such 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 the

sensor sensitivities. Be careful when the gas monitor is used in an environment where these
elements exist.

Do not use the gas monitor in a place where the temperature drops below -20ºC or rises over 50ºC.

• The operating temperature of the gas monitor is -20 to 50ºC. Do not use the gas monitor at

higher temperatures, humidities, and pressures or at lower temperatures than the operating
range.

• Avoid long-term use of the gas monitor in a place where it is exposed to direct sunlight.

• Do not store the gas monitor in a sun-heated car.

Observe the operating restrictions to prevent condensation inside the gas monitor or gas sampling

hose.
Condensation formed inside the gas monitor 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 the sampling
point to prevent condensation inside the gas monitor or gas sampling hose. Please observe the
operating restrictions.

Do not use a transceiver near the gas monitor.

• Radio wave from a transceiver near the gas monitor may disturb readings. If a transceiver is

used, it must be used in a place where it disturbs nothing.

• Do not use the gas monitor 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 monitor.
If the pump driving indicator is not rotating, gas detection cannot be performed properly. Check
whether the flow rate is lost.

Do not forget to perform a regular maintenance.
Since this is a safety unit, a regular maintenance must be performed to ensure safety. Continuing to
use the gas monitor without performing a maintenance will compromise the sensitivity of the sensor,
thus resulting in inaccurate gas detection.

- 7 - GX-8000

2 Important Notices on Safety 2-3. Precautions

CAUTION

Others

• Pressing buttons unnecessarily may change the settings, preventing alarms from activating
correctly. Operate the gas monitor using only the procedures described in this operating manual.

• Do not drop or give shock to the gas monitor. The water-proof and explosion-proof properties
and accuracy may be deteriorated.

• Do not use the gas monitor while recharging it.

• Whereas the gas monitor can detect oxygen, combustible gases, carbon monoxide, and

hydrogen sulfide, the operating environment may include gases that have harmful effects on the
sensors of this unit. (Different gases can be defected depending on the type.)

The gas monitor cannot be used in the presence of the following gases:
(1) Sulfides (such as H2S and SO2) continuously existing in high concentrations
(2) Halogen gases (such as chloride compounds and chlorofluorocarbons)
(3) Silicone (Si compounds)
Do not use the gas monitor in the presence of the above gases (such as high-concentration
sulfides, halogen gases, and silicone), which may shorten the sensor life significantly or cause
malfunctions such as inaccurate readings.
In case the gas monitor is used for detection in the presence of silicone, etc., be sure to check
the gas sensitivities before using it again.

GX-8000 - 8 -

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>

GX-8000
main unit

Li-ion battery unit

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 and

combustible gases or vapors and toxic gases.

• When using this gas monitor in a hazardous area, take the following countermeasures for
preventing dangers resulting from electrostatic charges.

(1) Wear anti-static clothes and conductive shoes (anti-static work shoes).
(2) For indoor use, use the gas monitor while standing on a conductive work floor (with a

leakage resistance of 10 MΩ or less).

• The battery units that can be connected are the BUL-8000(G) (certificate number TC19437) or
BUD-8000(G) (certificate number TC19438).

• The specifications of the gas monitor are as follows:

Pump circuit: Allowable voltage of 4.95 V, allowable current of 1.12 A, and

allowable power of 1138 mW

Combustible gas sensor circuit: Allowable voltage of 4.95 V, allowable current of 0.834 A, and

allowable power of 853 mW

Buzzer circuit: Allowable voltage of 4.95 V, allowable current of 0.431 A, and

allowable power of 441 mW

Main circuit: Allowable voltage of 4.95 V, allowable current of 0.717 A, and

allowable power of 733 mW

Backup circuit: 3.0 VDC, 10 µA

<Standard Accessories>

• AC powered charger: 1

• Gas sampling probe and

gas sampling hose: 1

• Shoulder strap: 1

• Operating manual

• Product warranty

- 9 - GX-8000

3 Product Components 3-2. Names and functions for each part

NOTE

There are the following two combinations of
battery units. The following information is printed
on the battery unit for the sake of identification to
prevent a mistake in combinations.

• BUL-8000 (certification number TC19437)=>
BUL-8000(G)

• BUL-8000 (certification number TC19438)=>
BUD-8000(G)

Additionally, a nameplate indicating a compatible
model is affixed on the top of the battery unit.
Check this information and use a correct
combination.

Printing for

identification

3-2. Names and functions for each part

<Outline Drawing>

GX-8000 - 10 -

3 Product Components 3-2. Names and functions for each part

(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 Used to carry out data communications with a PC in data logger

mode.

(5) ▲/AIR switch Keep this switch pressed to perform fresh air adjustment.

(6) ▼/RESET switch When an alarm occurs, press this switch to reset the alarm.

(7) DISPLAY 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 monitor. (Do not block it.)

(11) Recharging jack cover Remove this cover to connect an AC powered charger and recharge

the batteries.

(12) Recharging indicator lamp Lights up in red during recharging and goes off when recharging is

completed.

(13) Sensor cover There are sensors inside. May be opened only when the sensor is to

be replaced.

(14) Activated carbon filter knob

(15) Battery unit screws Turn these screws to detach and replace the battery unit.

CAUTION

• Do not jab the buzzer opening with a sharp-pointed item. The unit may malfunction or get
damaged, allowing water or foreign substance, 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.

Turn this knob to detach and replace the activated carbon filter. No
activated carbon filter is used on a type that does not measure carbon
monoxide. Keep this knob tightened at all times.

- 11 - GX-8000

3 Product Components 3-2. Names and functions for each part

<LCD Display>

(1) Pilot indicator

(2) Combustible gas

concentration digital
and bar display

(3) Carbon monoxide

concentration digital
and bar display

(4) Battery level icon

(1)

Pilot indicator Displays the operating status in the detection mode. Normal: Blinking

(2) Combustible gas

concentration
digital and bar display

(3) Carbon monoxide

concentration
digital and bar display

(4)

Battery level display

(5)

Pump driving indicator Displays the suction status in the detection mode. Normal: Rotating

(6) Oxygen concentration

digital and bar display

(7) Hydrogen sulfide

concentration
digital and bar display

(8)

Clock display Displays the current time.

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

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

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

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

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 recharging

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

(5) Pump driving

indicator

(6) Oxygen

concentration digital
and bar display

(7) Hydrogen sulfide

concentration digital
and bar display

(8) Clock display

GX-8000 - 12 -

4 How to Use 4-1. Before using the gas monitor

4

How to Use

4-1. Before using the gas monitor

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 monitor, 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 battery level is sufficient.

• Check that there is no bend or hole in the gas sampling hose.

• Check that the filter in the gas sampling probe is free of dust or clogging.

• Check that the gas monitor, gas sampling probe, and gas sampling hose are connected properly.

<Recharging of Batteries>

When the gas monitor is used for the first time, or when the battery level is low, be sure to use the
accessory AC powered charger to recharge the batteries.

CAUTION

• Use the dedicated AC powered charger.

• Recharge the batteries in a non-hazardous area.

• Recharge the batteries at ambient temperatures between 0 to 40ºC.

• Do not use the gas monitor while recharging it. Correct measurements cannot be obtained.

Furthermore, the batteries get deteriorated more quickly and may have a shorter life.

• The AC powered charger is not water-proof or dust-proof. Do not recharge the batteries while the
gas monitor is wet.

• The AC powered charger is not explosion-proof.

- 13 - GX-8000

4 How to Use 4-2. Preparation for start-up

(1) Open the recharging jack cover of the gas monitor.

CAUTION

Do not pull the recharging jack cover too hard.
It may get damaged.

(2) Put the plug of the AC powered charger into the recharging jack of

the gas monitor.

(3) Connect the AC powered charger to the wall electric outlet.

When recharging is started, the recharging indicator lamp lights up
(red).

(Recharging time: Three hours at the maximum until the batteries are fully recharged)
(4) When recharging is completed, the recharging indicator lamp goes off.
(5) When recharging 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 the gas monitor and reattach the

recharging jack cover. Put the recharging jack cover as far as it will go.

CAUTION

• Do not use the gas monitor with the recharging jack cover detached. Dust or water may get into
the gas monitor, causing it to malfunction. Replace the recharging jack cover if it is damaged.

• If the recharging 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 cover.

• 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 abnormal.

• The temperature of the gas monitor is high immediately after recharging is completed. Let it leave for

10 minutes or more 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.

GX-8000 - 14 -

4 How to Use 4-2. Preparation for start-up

<Attaching Batteries> (when the optional unit BUD-8000(G) is used)

When the gas monitor is used for the first time, or when the battery level is low, attach new AA alkaline
batteries.

CAUTION

<Replacement>

• Turn off the power of the gas monitor before replacing the batteries.

• Replace the batteries in a non-hazardous area.

• Replace all of the three batteries with new ones at one time.

• Pay attention to the polarities of the batteries.

• If the battery cover fixing screw is not completely tightened, the dry batteries may drop off or

(1) Using a flathead screwdriver or coin, turn the battery

(2) Paying attention to the polarities of batteries, replace

(3) Close the battery cover and tighten the battery cover

water may get in through the clearance. Water may also get in if a minute foreign substance is
caught beneath the battery unit.

<Batteries>

• Use AA alkaline batteries.
Rechargeable batteries cannot be used.

cover fixing screw counterclockwise to open the
battery cover.

all the three batteries with new ones.

fixing screw.

- 15 - GX-8000

4 How to Use 4-2. Preparation for start-up

<Detaching Battery Unit>

(1) Loosen the two battery unit screws.

(They need not be completely detached.)
(2) Detach the battery unit.
(3) Attach a new battery unit.

NOTE

Make sure that the battery unit is installed in
correct orientation by checking the locations of the
connection terminal and projection portions.

(4) Securely tighten the two battery unit screws.

CAUTION

• Turn off the power of the gas monitor before
replacing the battery unit.

• Detach and reattach the battery unit in a
non-hazardous area.

• If the battery unit screw is not completely
tightened, the battery unit may drop off or
water may get in through the clearance.
Water may also get in if a minute foreign
substance is caught beneath the battery
unit.

• Do not damage the rubber seal.

• To maintain the water-proof and dust-proof

performances, it is recommended to replace
the rubber seal every two years, whether or
not it has an abnormality.

GX-8000 - 16 -