PT0E-10512

Portable Toxic Gas Monitor

SC-8000
Operating Manual(PT0-105)

2-7-6 Azusawa, Itabashi-ku, Tokyo, 174-8744, Japan
Phone ： +81-3-3966-1113
Fax： +81-3-3558-9110
E-mail ： intdept@rikenkeiki.co.jp
Web site ： https://www.rikenkeiki.co.jp/english/

<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 ............................................. 2
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. Precautions ..................................................................................................................... 7
2-4. Safety information ........................................................................................................... 8
3. Product Components ............................................................................................................ 9
3-1. Main unit and standard accessories ................................................................................ 9
3-2. Names and functions for each part .................................................................................. 11
4. How to Use ........................................................................................................................... 14
4-1. Before using the gas monitor........................................................................................... 14
4-2. Preparation for start-up.................................................................................................... 14
4-3. Basic operating procedures ............................................................................................. 19
4-4. How to start the gas monitor............................................................................................ 20
4-5. How to detect .................................................................................................................. 22
4-6. Modes ............................................................................................................................. 25
4-7. Air calibration mode ......................................................................................................... 26
4-8. Display/setting mode ....................................................................................................... 28
4-9. How to exit....................................................................................................................... 33
5. Operations and Functions .................................................................................................... 34
5-1. Gas alarm activation ........................................................................................................ 34
5-2. Fault alarm activation ...................................................................................................... 36
5-3. Other functions ................................................................................................................ 36
6. Maintenance ......................................................................................................................... 37
6-1. Maintenance intervals and items ..................................................................................... 37
6-2. Gas calibration method ................................................................................................... 38
6-3. How to clean.................................................................................................................... 39
6-4. Parts replacement ........................................................................................................... 40
7. Storage and Disposal ........................................................................................................... 42
7-1. Procedures to store the gas monitor or leave it for a long time ....................................... 42
7-2. Procedures to use the gas monitor 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 ........................................................................................................... 48
10. Definition of Terms .............................................................................................................. 49-1-SC-8000

1 Outline of the Product1-1. Preface

1

Outline of the Product1-1. Preface
Thank you for choosing our portable toxic gas monitor SC-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 forusing 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 product is a gas monitor used to detect various toxic gases (CO, HCI, etc.) in the air with a selected
sensor.
Detection results are not intended to guarantee life or safety in any way.
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, andNOTE

SC-8000

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.

-2-

1 Outline of the Product1-4. Method of confirmation for Standards and Explosion proof specification

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.

Japan Ex mark or
EX/CE markName plate attachment position-3-

SC-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.
 When using the gas monitor 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 monitor while standing on a conductive work floor (with aleakage resistance of 10 MΩ or less).
 IP Protection grade : IP20
The protection grade on explosion-proof official approval is IP20. IP protection grade at the timeof product shipment is 67.
About explosion-proof of the main unit The battery units that can be connected are the BUL-8000(S)(TC20087), BUL-8000(S1)(TC21110)
or BUD-8000(S)(TC20088). If battery units other than specification are used, it will deviate from theregulation of explosion-proof official approval.
 The specifications of the gas monitor 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 0.715A, andallowable power of 732 mW
Backup circuit:
3.0 VDC, 10 µA
About explosion-proof of the battery unitReplace the battery unit in a non-hazardous area.
The main unit that can be connected is SC-8000 (TC20086) only.
The use with unspecified main units deviates from the regulation of explosion-proof certification.

The specifications of the BUD-8000(S) are as follows:
Pump circuit:
Maximum voltage of 4.95 V, maximum current of 1.12 A, andmaximum power of 1138 mW
Toxic gas sensor circuit:
Maximum voltage of 4.95 V, maximum current of 0.834 A, andmaximum power of 853 mW
Buzzer circuit:
Maximum voltage of 4.95 V, maximum current of 0.431 A, andmaximum power of 441 mW

SC-8000-4-

2 Important Notices on Safety

2-1. Danger cases

DANGER
Main circuit:

Maximum voltage of 4.95 V, maximum current of 0.715 A, andmaximum power of 732 mW
Power supply:
4.5 VDC, 100 mA (LR6 3 pcs)
The specifications of the BUL-8000(S), BUL-8000(S1) are as follows:
Pump circuit:
Maximum voltage of 4.25 V, maximum current of 1.12 A, andmaximum power of 901 mW
Toxic gas sensor 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 0.652 A, andmaximum power of 525 mW
Charge terminal:
Allowable voltage AC250V
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: SC-8000
Dry battery unit:
BUD-8000 (S)Nameplate
Lithium ion battery unit:
BUL-8000(S), BUL-8000(S1)location
Manufacturer:
RIKEN KEIKI Co., Ltd.
Explosion-proof class:
Ex ia IIC T4
Ambient temperature:-20 - 50 ºC (The ambient temperature on
explosion-proof certification is -20 - 50 ºC, andit indicates the temperature range which canmaintain the explosion-proof performance andnot the product performance.) Please do not perform the desorption of a battery unit, and the desorption of the dry cell of a dry
battery unit in a hazardous locations.
 Please use alkaline AA batteries of designation to the dry battery unit (Type LR6 manufactured
by Toshiba).
About use Toxic or other gases may blow out from the gas exhausting outlet. Never inhale the air or gases.

-5-SC-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 theatmospheric pressure. The internal piping system may be damaged.
Handling of sensor
Do not disassemble the electrochemical type sensor because it contains 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 isdecomposed. 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 onyour judgment.
Battery level check
Before use, check that there remains sufficient battery power. When the gas monitor 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 voltage alarm occurs, gas detection cannot be conducted. If the alarm occurs
during use, turn off the power and promptly charge the batteries in a non-hazardous area.








OthersDo 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.

SC-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 place the gas monitor where water or dirt gets accumulated. The gas monitor placed at such alocation 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 -10 ºC or rises over 40 ºC.
 The operating temperature of the gas monitor is -10 - 40 ºC. 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 sampling probe.
Condensation formed inside the gas monitor or sampling probe causes clogging or gas adsorption,
which may disturb accurate gas detection. Thus, condensation must be avoided. In addition to theoperating environment, carefully monitor the temperature/humidity of the sampling point to prevent
condensation inside the gas monitor or sampling probe. 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 isused, 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.
Direct the LCD display upward.
Use the gas monitor with the LCD display facing upward. The gas monitor, when used with the LCD
display in a tilted or flat status, may not display correct values. Likewise, store the gas monitor with
the LCD display facing upward.
OthersPressing buttons unnecessarily may change the settings, preventing alarms from activatingcorrectly. 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 charging it.

-7-SC-8000

2 Important Notices on Safety

2-4. Safety information

2-4. Safety information
Observe the followings to maintain an explosion-proof system.

<ATEX/IECEx Specifications>
Safety information
The Portable Toxic Gas Monitor Model SC-8000 is a gas monitor designed to provide continuous exposure
monitoring of toxic gas 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
・Ex ia IIC T4 Ga
・

II 1 G Ex ia IIC T4 Ga

・Ambient temperature range for use : -20 °C - +50 °C
・Ambient temperature range during battery charging : 0 °C - +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 = 250 V.
・Power supply of alkaline battery unit : BUD-8000
Powered by three series connected Alkaline AA batteries, type LR6 manufactured by Toshiba.
・Backup battery type CR1220 manufactured by Maxell.

Certificate numbers
・IECEx Certificate number : IECExDEK 11.0019
・ATEX Certificate number : DEKRA 11ATEX0047

List of standards
・IEC 60079-0: 2017
・IEC 60079-11: 2011

・EN IEC 60079-0:2018
・EN 60079-11:2012

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
AB C
DE
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, JapanPhone: +81-3-3966-1113
Fax: +81-3-3558-9110
E-mail: intdept@rikenkeiki.co.jp
Web site: https://www.rikenkeiki.co.jp

SC-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><Standard Accessories> Sampling probe: 1

SC-8000
main unit Shoulder strap
 Operating manual Product warranty
Dry battery unit (BUD-8000 (S))-9-SC-8000

3 Product Components

3-1. Main unit and standard accessories

DANGER
About explosion-proof
 Do not modify or change the circuit or structure, etc.
 When using the gas monitor 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 monitor while standing on a conductive work floor (with aleakage resistance of 10 MΩ or less).
 IP protection grade : IP20
The protection grade on explosion-proof official approval is IP20. IP protection grade at the timeof product shipment is 67.
About explosion-proof of the main unit The battery units that can be connected are the BUL-8000(S)(TC20087), BUL-8000(S1)(TC21110)
or BUD-8000(S)(TC20088). If battery units other than specification are used, it will deviate from theregulation of explosion-proof official approval.
 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
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 0.715 A, andallowable power of 732 mW
Backup circuit:
3.0 VDC, 10 µA
About explosion-proof of the battery unit
 Replace the battery unit in a non-hazardous area.
 The main unit that can be connected is SC-8000 (TC20086) only.
The use with unspecified main units deviates from the range of explosion-proof certification.
 The specifications of the BUD-8000(S) are as follows:
Pump circuit:
Maximum voltage of 4.95 V, maximum current of 1.12 A, andmaximum power of 1138 mW
Toxic gas sensor circuit: Maximum voltage of 4.95 V, maximum current of 0.834 A, andmaximum power of 853 mW
Buzzer circuit:
Maximum voltage of 4.95 V, maximum current of 0.431 A, andmaximum power of 441 mW
Main circuit:
Maximum voltage of 4.95 V, maximum current of 0.715 A, andmaximum power of 732 mW
Power supply:
4.5 VDC, 100 mA (LR6 3 pcs)
 The specifications of the BUL-8000(S), BUL-8000(S1) are as follows:
Pump circuit:
Maximum voltage of 4.25 V, maximum current of 1.12 A, andmaximum power of 901 mW
Toxic gas sensor 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 0.652 A, andmaximum power of 525 mW
Charging terminal :Allowable voltage AC 250 V

SC-8000- 10 -

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 incombinations.


SC-8000 Battery Unit
For model SC-8000 only

Lithium ion battery unit :BUL-8000(S) (certification number TC20087),
BUL-8000(S1) (certification number TC21110)
Dry battery unit :BUD-8000(S) (certification number TC20088)

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

Printing for
identification

3-2. Names and functions for each part
<Outline Drawing>- 11 -

SC-8000

3 Product Components
(1)
(2)
(3)
(4)

LCD display
Buzzer sound opening
Alarm LED arrays
Infrared communication port(5) ▲/AIR switch(6) ▼/RESET switch(7) DISPLAY switch(8) POWER/ENTER switch(9) Gas inlet(10) Gas outlet(11) Battery unit screws(12) Battery cover(13) Battery cover fixing screw

3-2. Names and functions for each part
Display gas concentrations, alarms, etc.
Emit a buzzer sound at an alarm. (Do not block it.)
The lamp blinks in response to an alarm.
Used to carry out data communications with a PC in data logger
mode.
Keep this switch pressed to perform fresh air adjustment.
When an alarm occurs, press this switch to reset the alarm.
Press this switch to change between display modes.
Turn on and off the power.
Connect a sampling hose to this port.
Exhaust the gas drawn into the gas monitor. (Do not block it.)
Turn these screws to detach and replace the battery unit.
Open or close this cover to replace batteries. Must be closed while
the gas monitor is in use.
Fixe the battery cover.

CAUTION

Do not jab the buzzer opening with a sharp-pointed item. The unit may malfunction or getdamaged, 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.

SC-8000- 12 -

3 Product Components

3-2. Names and functions for each part

<LCD Display>(4) Pump driving
indicator(1) Pilot indicator(2) Gas concentration
digital and bar
display(5) Gas name display(3) Battery level icon

(1)
(2)
(3)
(4)
(5)

Pilot indicator
Gas concentration display
digital and bar display
Battery level icon
Pump driving indicator
Gas name display

Displays the operating status in the detection mode. Normal: Blinking
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 ofbattery level icons.
Displays the suction status in the detection mode. Normal: Rotating
Displays the gas name of detection target.

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 (- 13 -).

SC-8000

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 sampling probe.
Check that the filter in the sampling probe is free of dust or clogging.
Check that the main unit and sampling probe are connected properly.

SC-8000- 14 -

4 How to Use

4-2. Preparation for start-up<Attaching Batteries> (When the dry battery unit BUD-8000(S) 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 orwater may get in through the clearance. Water may also get in if a minute foreign substance iscaught beneath the battery unit.
 Please shorten time to make the gas monitor upside-down in case of battery replace.
 Please shorten time to turn off the gas monitor electricity in case of battery replace.
<Batteries> Use Alkaline AA batteries, type LR6 manufactured by Toshiba.
Chargeable batteries cannot be used.

(1) Using a flathead screwdriver or coin, turn thebattery cover fixing screw counterclockwise toopen the battery cover.

(2) Paying attention to the polarities of batteries,
replace all the three batteries with new ones.
(3) Close the battery cover and tighten the battery
cover fixing screw.
(4) After replacing the batteries, place the gas
monitor with the display facing upward.

- 15 -

SC-8000

4 How to Use

4-2. Preparation for start-up<Charging Battery Unit> (when the lithium ion battery unit BUL-8000(S) ,BUL-8000(S1) <Option> are used)
When the gas monitor 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 - 40 ºC.
Do not use the gas monitor while charging it. Correct measurements cannot be obtained.
Furthermore, the batteries get deteriorated more quickly and may have shorter life.
 The AC powered charger is not water-proof or dust-proof. Do not charge the batteries while thegas monitor is wet.
 The AC powered charger is not explosion-proof.
(1) Open the charging jack cover of the gas monitor.

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

(2) Put the plug of the AC powered charger into thecharging jack of the gas monitor.
(3) Connect the AC powered charger to the wall
electric outlet.
When charging is started, the charging indicator
lamp lights up (red).
(Charging time: Three hours at the maximum until
the batteries 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 the gas monitor and reattach the charging
jack cover. Put the charging jack cover as far as it will go.



CAUTION

Do not use the gas monitor with the charging jack cover detached. Dust or water may get into thegas monitor, 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 cover.
 Disconnect the AC powered charger from the wall electric outlet while it is not in use.

NOTE




During charging, the battery pack may get hot, but this is not abnormal.
The temperature of the gas monitor is high immediately after charging is completed. Let it leave for 10
minutes or more before using it. Otherwise, correct measurements may not be obtained.
 When fully charged batteries are charged again, the charging indicator lamp does not go on.

SC-8000- 16 -

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.

Connection
terminal

NOTE
Make sure that the battery unit is installed in correct orientation bychecking the locations of the connection terminal and projection
portions.
(4) Securely tighten the two battery unit screws.

Battery unit screws

CAUTION Turn off the power of the gas monitor before replacing thebattery unit.
 Detach and reattach the battery unit in a non-hazardousarea.
 If the battery unit screw is not completely tightened, thebattery unit may drop off or water may get in through theclearance. 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.
 Please shorten time to make the gas monitor upside-down
in case of battery replace.
 Please shorten time to turn off the gas monitor electricity incase of battery replace.

Bottom of Gas Monitor(5) After attaching the battery unit, place the gas monitor with the display facing upward.

- 17 -

SC-8000

4 How to Use

4-2. Preparation for start-up<Connection of Sampling Probe> Connect the sampling probe securely to the gas inlet (GAS IN) of the gas monitor.

Insert the sampling hose to the gas inlet (GAS IN) until it clicks into place to ensure connection.



CAUTIONUse only a sampling probe specified by Riken Keiki.
To avoid drawing foreign substances, always use the gas monitor with the sampling probe
connected to it.

NOTE



Release Sampling
ring
probe

Main unit

To remove the sampling probe from the gas inlet, pull it while
pushing the release ring against the main unit.

Pull out the sampling probe
while pushing the release ringagainst the main unit.

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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>>
RESET

AIR (long pressing)<<Gas Alarm Status>>(Self-latching <Reset after
Recovery to Normal Status>)<<Air Calibration Mode>>

DISPLAY<<Fault Alarm Status>>(Self-latching)<<Display and Setting Mode>>- 19 -

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4 How to Use

4-4. How to start the gas monitor

4-4. How to start the gas monitor<<Start-up Procedure>>
Keep the POWER switch pressed for three seconds or more.

↓
LCD
Alarm lamp lights up.
Buzzer sounds once. (Beep)

All LCDs Light Up.

↓
Date/Time Display↓
Battery Voltage Display↓
Gas Name and Full Scale Display↓
First Alarm Setpoint Display↓
Second Alarm Setpoint Display↓

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4 How to Use

4-4. How to start the gas monitor↓
ID Display↓
Buzzer sounds twice. (Beep, beep)

Detection Mode

CAUTION
After start-up, perform air calibration before performing gas detection (air calibration mode).

NOTE



A sensor abnormality alarm is issued before the detection mode is entered if there is any abnormality
in the sensor. Promptly contact RIKEN KEIKI. Gases cannot be detected if there is any abnormality inthe sensor.
 If there is an abnormality in the built-in clock, a fault alarm [FAIL CLOCK] may be issued. Press the
RESET switch. The fault alarm is temporarily reset, and measurement is started with incorrect clocktime.
 When the power is turned on in a low-temperature environment, the pump may produce bigger
operating sound for warm-up (about 30 seconds). This is not abnormal.

- 21 -

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4 How to Use

4-5. How to detect

4-5. How to detect
In the detection mode, put the sampling probe close to the detection area and take the reading on thedisplay.
Display example<- Display example
Gas concentration: 0.0 ppm
Battery level:
Sufficient

DANGER












Toxic or other gases may blow out from the gas exhausting outlet. Never inhale the air or gases.

WARNINGThe 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 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 monitor is used forthe first time or is not used for a long period, the batteries may be exhausted. Either replace thebatteries with new ones or fully charge them before use.
If a low battery alarm occurs, gas detection cannot be conducted. If the alarm occurs during use,turn off the power and promptly replace the batteries with new ones or charge them in a
non-hazardous area.
Do not block the buzzer sound opening. No alarm sound can be heard.

SC-8000- 22 -

4 How to Use

4-5. How to detect

CAUTION

Before performing gas detection, attach the sampling probe provided with the gas monitor toprevent disturbances by air dust.
 Use the gas monitor with the LCD display facing upward. The gas monitor, when used with the
LCD display in a tilted or flat status, may not display correct values.
 If a high-concentration gas or highly adsorptive gas, such as HCI and NH3, is drawn, some gas
may remain in the hose due to adsorption in the sampling probe or others. After drawing ahigh-concentration gas or highly adsorptive gas, clean the gas monitor to remove the adsorbedgas (draw fresh air and check that the reading becomes zero).
Performing fresh air adjustment before cleaning it completely will result in inaccurate adjustment,
giving adverse influence on measurement.
 In gas detection at the place where the presence of a high-concentration gas is anticipated,ex.
Bring a sampling probes to a detection area close gradually. Do not detect high- concentration
gas exceeding a full scale. When a high-concentration gas exceeding a full scale is detected, thegas monitor may display [OVER] (OVER alarm) and [FAIL BIAS] (failure alarm) by turns. In thatcase, attract fresh air to the gas monitor. Measured value should descend, and wait until it isstabilized. Then, perform gas calibration. Because, zero point and gas sensitivity may bechanged.

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.

- 23 -

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4 How to Use

4-5. How to detect<Manual Memory>
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, keep the ▼/RESET switch pressed and press the ▲/AIR switch to prepare forrecording (about one second). The following screens are displayed in turn on the gas monitor.

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
DISPLAY switch to return to the detection mode.
(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.

Returns to the detection mode.

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4 How to Use

4-6. Modes

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

Details
Normal state

Air Calibration
Mode―[AIR CAL]

Perform the zero adjustment.

Display andSetting ModePeak Display[PEAK]

Display the maximum concentration
detected during measurement frompower-on to the present.

Average Valueand Elapsed
Time Display[AVERAGE]

Display the average value and elapsed timeafter power-on.
Display example Average value: 3.0 ppm
Elapsed time: 56 minutes

Alarm Setpoint [ALARM-P]
Display
Alarm test

Display the full scale and alarm setpointvalues and check the alarm operations forthe settings displayed.

ID Setting[ID SELECT]

Display an ID if it has been set in advance.
Also used to change or set an ID.

Log Data
Display[REC.DATA]

Display data recorded to the manual
memory.

Date/Time
Display[DATE]

Display the date and time.

BuzzerVolumeSelection[BEEP SELECT]

Select either large or small for buzzer
volume.

- 25 -

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4 How to Use

4-7. Air calibration mode

4-7. Air calibration mode
Keep pressing the AIR
switch until [RELEASE] isdisplayed.

When the AIR switch ispressed, the display changes
to [Adj HOLD AIR].

When [RELEASE] isdisplayed, release the AIR
switch.

When the zero adjustment is
successfully completed, andyou return to the detection
mode.

WARNING
When air calibration is performed in the atmosphere, check the atmosphere for freshness before
beginning the 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 C or more between the storage and operation
locations, turn on the power of the gas monitor, 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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4 How to Use

4-7. Air calibration mode

NOTE




Air calibration can be performed even when there is a gas alarm.
If air calibration fails, [FAIL AIR CAL] is displayed.
Press the RESET switch to reset the fault alarm (calibration failure). Whenthe alarm is reset, the value before calibration is displayed.
If sensor is faulty- 27 -

SC-8000

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 DISPLAY switch is pressed, various screens are displayed in turn.
LCD
Detection Mode

Display and Setting Mode

PEAK Value Display
Display the maximum
concentration detected during
measurement from power-on to
the present.

Display example
Average value: 3.0 ppm
Elapsed time: 56 minutes

Average Value and Elapsed
Time Display
Display the average value andelapsed time after power-on.

Full Scale Display/Alarm Setpoint
ENTER Display/Alarm Test P29

Full Scale Display/Alarm
Setpoint Display/Alarm Test
Display the full scale and alarm
setpoint values and check thealarm operations for the settings
displayed.

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4 How to Use

4-8. Display/setting mode

ID Display/Selection
Display an ID if it has beenregistered in advance. Also used
to select an ID.

ID Display/Selection
 P31
ENTER

Log Data Display
Display concentration data
recorded to the manual memory.

Log Data Display
 P32
ENTER

Date/Time Display

Buzzer Volume Selection

To Detection Mode

NOTE
The gas monitor automatically returns to the detection mode in about 20 seconds if the gas monitor is left
unoperated.

- 29 -

SC-8000

4 How to Use

4-8. Display/setting mode

<Full Scale Display/Alarm Setpoint Display/Alarm Test [ALARM-P]>
Display the full scale or alarm setpoint values and check the alarm operations for the settings displayed.
(1) Press the DISPLAY switch and select the full scale display / alarm setpoint display / alarm test from thedisplay/setting mode menu. The following screens are displayed in turn on the gas monitor.

(2) Press the ENTER switch to enter the alarm setpoint or other display.

NOTE
If you do not want to enter any display, press the DISPLAY switch to return to the display/setting modemenu.
(3) Every time the ▲ or ▼ switch is pressed, the full scale and alarm setpoint menus, i.e., full scale display,first alarm setpoint display and second alarm setpoint display, are displayed in turn.
Press either the ▲ or ▼ switch to select a setting that you want to check.
Select one of the following screens:

Full Scale Display

First Alarm Setpoint Display([WARNING])

Second Alarm Setpoint
Display ([ALARM])(4) Press the ENTER switch to perform alarm test. The alarm operation on this screen can be checked.
Press any switch to stop the alarm operation.
(5) Press the DISPLAY switch to exit the alarm setpoint display or alarm test. The display/setting modemenu is displayed again.
(6) After completion, press the DISPLAY switch several times until it returns to the detection mode.

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4 How to Use

4-8. Display/setting mode

<ID Display/Selection [ID SELECT]>
Display an ID if it has been registered in advance. Also used to select an ID.
(1) Press the DISPLAY switch and select the ID display/selection from the display/setting mode menu.
The following screens are displayed in turn on the gas monitor.

(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 DISPLAY switch to return to the display/setting
mode menu.
 On the gas monitor, either of the IDs from ST-ID000 to ST-ID255 has been registered, unlessotherwise specified.
 The data logger management program (option) is required to register or change an ID. Please contact
RIKEN KEIKI.
 When an ID is not selected (factory default), the following display
appears without showing an ID.

(3) Press either the ▲ or ▼ switch to select an ID.
Every time the ▲ or ▼ switch is pressed, the ID number increases or decreases (000 - 255).

(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 DISPLAY switch several times until it returns to the detection mode.

- 31 -

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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 DISPLAY switch and select the log data display from the display/setting mode menu.
The following screens are displayed in turn on the gas monitor.

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

NOTE
If you do not want to display the log data, press the DISPLAY switch to return to the display/setting modemenu.
(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
the year, month, day, time, and memory number.

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

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

SC-8000- 32 -

4 How to Use

4-9. How to exit

<Buzzer Volume Selection>
Select a volume for the alarm sound.
(1) Press the DISPLAY switch and select the buzzer volume selection display from the display/setting
mode menu.
The following screens are displayed in turn on the gas monitor.

(2) Press the ENTER switch to select a buzzer volume.
(3) Press either the ▲ or ▼ switch to select a buzzer volume.
(3) Every time the ▲ or ▼ switch is pressed, [SMALL] and [LARGE] are displayed in turn.
Select one of the following screens:[SMALL] (buzzer volume: small)[LARGE] (buzzer volume: large)(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 DISPLAY switch to return to the detection mode.

4-9. How to exit
Make the gas monitor draw in fresh air. After the display resets to zero, keep the POWER/ENTER 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 monitor.

- 33 -

SC-8000

5 Operations and Functions

5-1. Gas alarm activation

5

Operations and Functions
5-1. Gas alarm activation
Gas alarm:

Triggered when the concentration of detected gas reaches or exceeds the alarm setpointvalue. <<Self-latching>>
Alarm display: Notified by blinking of a gas concentration value display, sounding of the buzzer, and lightingof the lamp.
Alarm types: First alarm (WARNING), second alarm (ALARM) and OVER alarm<List of Gas Alarms>
Alarm type
BuzzerAlarm lamp
LCD display

SC-8000

First alarm
Repeatedly sounds strong
and weak beeps at about
one second intervals:
Beep, beep
Repeatedly blinks at about
one second intervals.
Gas concentration and[WARNING] display blink.

Second alarm
Repeatedly sounds strong
and weak beeps at about
0.5 second intervals:
Blip, blip
Repeatedly blinks at about
0.5 second intervals.
Gas concentration and[ALARM] display blink.

- 34 -

OVER alarm
Repeatedly sounds strong
and weak beeps at about
0.5 second intervals:
Blip, blip
Repeatedly blinks at about
0.5 second intervals.
Gas concentration and[OVER] display blink.

5 Operations and Functions

5-1. Gas alarm activation<Display Operation>
Gas Concentration Display
In a gas alarm, the gas concentration display and the alarm typedisplay blink.
In case of over the detection range (Over Scale), [∩∩∩] is displayedon the LCD.
Display example
Alarm Lamp
The alarm consists of two steps. Each of them is triggered when the respective alarm setpoint value isreached to or exceeded.
Buzzer
The alarm consists of two steps. Each of them sounds when the respective alarm setpoint value isreached to or exceeded.
"Alarm Pattern (H-HH)"
1 second interval
RESET

0.5 second interval

Concentration

Second alarm
setpoint
First alarm
setpoint

Time
Alarm lamp,
BuzzerWARNING
Issuance of a gas alarm indicates that there are extreme dangers. Take proper actions based on yourjudgment.

- 35 -

SC-8000

5 Operations and Functions

5-2. Fault alarm activation

5-2. Fault alarm activation
Fault alarm:
Triggered when an abnormality is detected in the gas monitor. <<Self-latching>>
Alarm display: Notified 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 monitor 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

NOTE



To reset a low flow rate alarm ([FAIL LOW FLOW]), remove the cause of the low flow rate, and thenpress the RESET switch.
 For information on malfunctions (error messages), see '8. Troubleshooting'.

5-3. Other functions<Calibration History/Various Trend/Event History Functions>
The gas monitor has history and trend functions. To use these functions, contact RIKEN KEIKI.

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

SC-8000- 36 -

6 Maintenance

6-1. Maintenance intervals and items

6

Maintenance
The gas monitor is an important instrument for the purpose of safety.
To maintain the performance of the gas monitor 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 a maintenance once or more for every six months to maintain theperformance as a safety unit.
Maintenance
item
Battery Level
Check
Concentration
Display
Check

Flow Rate
Check
Filter Check
Alarm Test

Span
Adjustment
Gas Alarm
Check

Maintenance content

Daily
Monthly
Regularmaintenance maintenance maintenanceCheck that the battery level is sufficient.
Make the gas monitor draw in fresh air andcheck that the concentration display value
is zero. When the reading is incorrect,
perform the zero adjustment (fresh air
adjustment) after ensuring that no othergases exist around it.
See the flow rate indicator to check for
abnormalities.
Check the dust filter for dust or clogging.
Check the alarm lamp and buzzer for
normal operation using the alarm test
function.
Perform the span adjustment by using thecalibration gas.
Check the gas alarm by using thecalibration gas.

- 37 -

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



























SC-8000

6 Maintenance

6-2. Gas calibration method<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 gas monitor, please use ourmaintenance service.
 The followings are typical maintenance services. For more information, please contact RIKEN KEIKI.
Main Services
Battery Level
Check
Concentration
Display Check
Flow Rate Check

Filter Check
Alarm Test
Span Adjustment
Gas Alarm Check: Checks the battery level.
: Verifies that the concentration display value is zero (or 20.9 vol% on the oxygen deficiency
meter) by using the zero gas.
Performs the zero adjustment (fresh air adjustment) 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 monitor. 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.
: Checks the alarm lamp and buzzer for normal operation using the alarm test function.
: Performs the span adjustment by using the calibration gas.
: Checks the gas alarm by using the calibration gas.
 Checks the alarm. (Checks the alarm activation when the alarm setpoint is reached.) Checks the delay time. (Checks time to delay until the alarm is triggered.) Checks the buzzer, lamp, and concentration display. (Check each activation of ALM1 and
ALM2.): Checks dust or damage on surface of the gas monitor, clean and repair such parts of the gas
monitor.
Replaces parts which are cracked or damaged.

Cleaning andRepair of Gas
Monitor(visual diagnosis)
Gas Monitor: Uses the keys to check the operation of functions and parameters.
Operation Check
Replacement of: Replaces consumable parts, such as a sensor, filter and pump.
Consumable Parts

6-2. Gas calibration method
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.

SC-8000- 38 -

6 Maintenance

6-3. How to clean

6-3. How to clean
Clean the gas monitor if it becomes extremely dirty. The gas monitor must be turned off while cleaning it. Usea 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 sampling probe may disturb the gas detection, it must
be cleaned with dry AIR, etc.

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

NOTE
When the gas monitor gets wet, water may remain in the buzzer sound opening or clearances. Drain
water as follows:(1) Wipe away moisture on the gas monitor thoroughly using a dry towel, cloth, etc.
(2) While holding the gas monitor 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 monitor on a dry towel, cloth, etc. and let it stand at normal temperatures.

- 39 -

SC-8000

6 Maintenance

6-4. Parts replacement

6-4. Parts replacement<Replacement of Consumables>
Sensor Replacement
The built-in sensors of the gas monitor have a validity period and must be replaced regularly (within two
years).
The sensor life has expired if, for example, the sensors cannot be calibrated in span adjustment, thereadings do not come back after fresh air adjustment, or the readings fluctuate. Contact RIKEN KEIKI. The
warranty period is one year for all the sensors.
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.
The gas monitor has various built-in filters.
Sampling probe
The sampling probe has a built-in Teflon filter. Replace the filter when it has absorbed water, has a low flow
rate, or looks significantly contaminated.

(1) Hold the handling part and turn the middle part(transparent ring) to separate the sampling probe.

Transparent ring

Handling part(2) Take out the following filter and insert a new filter.

(3) Attach the tip that has been removed.

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Replacement- 40 -

6 Maintenance

6-4. Parts replacement<Replacement of Regular Replacement Parts>
List of recommended regular replacement parts
No.
1
2
3
4

Item
Rubber seal
Tube
Pump unit (RP-11)
Lithium ion battery
pack (BP-8000)

Maintenanceintervals
6 months
6 months

Replacement
intervals
2 years
3 - 8 years
1 - 2 years







Quantity(pieces per unit)

1 set
1 set
1
1

Remarks About 500 cycles ofcharging anddischarging
 For BUL-8000(S) For BUL-8000(S1)NOTEThe 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 regular
maintenance may determine when to replace the parts.
The operation of most of the periodical replacement parts must be checked after replacement by a qualified
service engineer.
For the stable operation of the gas monitor and safety, ask a qualified service engineer to take care of
replacement of the parts whose operation must be checked. Please contact RIKEN KEIKI.

- 41 -

SC-8000

7 Storage and Disposal

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

Storage and Disposal
7-1. Procedures to store the gas monitor or leave it fora long time
The gas monitor 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 monitor in a shipping carton, if any, in which the product was delivered.
Store the gas monitor away from dust, etc. if the shipping carton is not available.
Make sure to store the gas monitor with the display facing upward.



CAUTION

If the gas monitor is not used for a long time, turn on the power at least once every six months
and check that the pump draws in air (about three minutes). The gas monitor, when not activatedfor a long time, may cease to work because of hardening of the grease in the pump motor.
 Store the gas monitor with dry batteries attached. While the power of the gas monitor is OFF, thesensor is energized at all times. If dry batteries are removed, the sensor may not function at thenext use of the gas monitor. Therefore, it is necessary to store the gas monitor with the batteries
in it.

NOTECheck that the battery level is sufficient once every six months. If a low battery voltage alarm istriggered while checking, replace the dry batteries with new ones (or charge the Lithium ion battery unit).
Because the sensor is energized at all times even when the power is OFF, it is necessary to replace thebatteries (or charge the Lithium ion battery unit).
If the gas monitor is used with low-level batteries, battery leaks resulting from over discharging may
occur.
 If the gas monitor 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
monitor is stored with the batteries fully charged, the batteries get deteriorated more quickly and may
have shorter life.

SC-8000- 42 -

7 Storage and Disposal

7-2. Procedures to use the gas monitor again

7-2. Procedures to use the gas monitor again
CAUTION
When you use a stopped/stored gas monitor again, do not forget to perform a gas calibration. For
information on readjustment including gas calibration, please contact RIKEN KEIKI.

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



WARNING

Do not disassemble the electrochemical type sensor because it contains 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 isdecomposed. If contact occurs, rinse the area immediately with a large quantity of water.
 Dispose of the batteries in accordance with procedure specified by the local authority.

- 43 -

SC-8000

8 Troubleshooting

8

Troubleshooting
The troubleshooting does not explain the causes of all the malfunctions which occur on the gas monitor.
This simply helps to find the causes of malfunctions which frequently occur. If the gas monitor shows asymptom which is not explained in this manual, or still has malfunctions even though remedial actions aretaken, please contact RIKEN KEIKI.

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

CausesThe battery level is toolow.

Abnormaloperations
Key operations are
disabled.

The power switch was
not pressed longenough.
Improper installation of
the battery unit
Disturbances by sudden
surge noise, etc.
Disturbances by sudden
surge noise, etc.

Systemabnormalities[FAIL SYSTEM]
Systemabnormalities[FAIL SYSTEM]
Error No.000
Error No.010
Error No.021
Error No.031
Sensorabnormalities[FAIL SENSOR]
A low battery
voltage alarm isdisplayed.
[FAIL BATTERY]
A low flow rate
alarm is displayed.
[FAIL LOW FLOW]

SC-8000

A circuit abnormality
occurred.

Abnormalities of internal
ROM
Abnormalities of internalRAM
Abnormalities of internal
FRAM
Abnormalities of internal
FLASH
A sensor has failed.
The battery level is low.

Water or oil, etc. wasdrawn in.
The gas sampling hose
is clogged.

Actions
Lithium ion battery unit: Charge the batteries in a
non-hazardous area.
Dry battery unit: Replace all the three dry batteries withnew ones in a non-hazardous area.
For power-on, keep the POWER switch pressed until abeep is heard (about two seconds).
Check whether the battery unit is properly attached tothe main unit.
Turn off and restart the gas monitor.
In a non-hazardous area, remove the battery unit once,and reinstall the battery unit, and turn on the power toperform operations.
Request RIKEN KEIKI for repair.

Request RIKEN KEIKI for repair.

Request RIKEN KEIKI to replace the sensor.
Lithium ion battery unit: Turn off the power and charge it
in a non-hazardous area.
Dry battery unit: Turn off the power and replace the drybatteries with new ones in a non-hazardous area.
Check the gas sampling hose for any damage or markof drawn water or oil, etc.
Check the gas sampling hose for connections, clogging,twisting, etc.
- 44 -

8 Troubleshooting
Symptoms
Fresh airadjustment cannot
be performed.
[FAIL AIR CAL]
Clock
abnormalities[FAIL CLOCK]The batteries
cannot be
charged.
(Li-ion battery unit
only)
[FAIL BIAS][OVER] and [FAIL
BIAS] aredisplayed by turns.

CausesThe pump hasdeteriorated.
Fresh air is not suppliedaround the gas monitor.
Abnormalities of theinternal clock
The charger is notconnected properly.
A charging circuit
abnormality occurred.
The batteries have been
fully charged.
Abnormalities of bias
voltage
The concentrated gases
far exceeding a full scale
was attracted.

Actions
Request RIKEN KEIKI to replace the pump.
Supply fresh air.

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. Please contact RIKEN KEIKI.
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.
Request RIKEN KEIKI for repair.
Attract fresh air to the gas monitor. Measured value
should descend, and wait until it is stabilized.
Then, perform gas calibration. Because, zero point andgas sensitivity may be changed.

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

CausesDrifting of sensor output
Presence ofinterference gas
Slow leakA gas alarm istriggered despiteof no gas leak andno otherabnormalities atthe detection
point.
Slow response

Span adjustment
impossible

Environmental changes
Presence ofinterference gas
Disturbance by noise

Clogged dust filter
Bended or clogged
suction tube or exhausttube
Condensation is formed
inside the suction tube.
Deteriorated sensor
sensitivity
Improper calibration gas
concentration
Deteriorated sensor
sensitivity

Actions
Perform the zero adjustment (fresh air adjustment).
Disturbances by interference gases cannot be eliminatedcompletely. For information on actions, such as removal
filter, please contact RIKEN KEIKI.
A very small amount of the gas to be detected may beleaking (slow leak). Because ignoring it may cause
dangers, take a remedial measure, i.e., taking actions thesame as those for the gas alarm.
Perform the zero adjustment (fresh air adjustment).
Disturbances by interference gases cannot be eliminatedcompletely. For information on actions, such as removal
filter, please contact RIKEN KEIKI.
Turn off and restart the gas monitor.
If such a symptom is observed frequently, takeappropriate measures to eliminate the noise.
Replace the dust filter.
Fix the defective parts.
Fix the defective parts.
Request RIKEN KEIKI to replace the sensor.
Use the proper calibration gas.
Request RIKEN KEIKI to replace the sensor.

- 45 -

SC-8000

9 Product Specifications

9-1. List of specifications

9

Product Specifications
9-1. List of specifications<Japan Ex Specification>
Detection principle
Detectable gas
Gas concentration display
Measuring range
Detection method
Suction flow
Alarm preset point
Various indications
Alarm soundAlarm accuracy

Electrochemical type
Toxic gas
LCD (digital)
Depend on Detectable gas
Pump suction method
Above 0.5 L/min
Depend on Detectable gas
Gas/Battery condition/Pilot indicator/Flow indicator
Above 95 dB (A) (30 cm)
Less than ±30 % (against alarm preset point)(under an identical condition)

Alarm-delay timeLess than 60 sec (when introducing 1.6 times thicker gas than alarm preset point)(under an identical condition)

Gas alarm typeGas alarm indication
Gas alarm indication
Trouble alarm・Self diagnosis
Trouble alarm indication
Trouble alarm action
Specification of transmission
Various functions
Power supply
Continuous operation time
Operating temperature
Operating humidity
Structure
Explosion-proof structure
Explosion-proof grade
Outer dimension
WeightSC-8000

Two-level alarm(H-HH)/OVER
Lamp blinking/Intermittent buzzer/Gas concentration display blinking
Latched
System failure/Sensor failure/Low Battery/Calibration failure/Flow failure
Lamp blinking/Intermittent buzzer/Content display
LatchedIrDA
LCD backlight/Data logger/Peak hold/Average/Logged data display/Beep select/Date
Dedicated dry battery unit <three AA batteries>【BUD-8000(S)】(Lithium ion battery unit 【BUL-8000(S)】, 【BUL-8000(S1)】 are available.)
BUD-8000(S): Approx. 18 hours (25 °C・Non alarm operation)
BUL-8000(S), BUL-8000(S1): Approx. 25 hours (25 °C・Non alarm operation・After full charge)-10 - 40 °C (non-rapidly-vary. It may differ according to mounted sensor.)
30 - 70 %RH (non-condensing. It may differ according to mounted sensor.)
Dust and Water-proof Structure (IP67)
Intrinsically safe structure
Ex ia ⅡC T4Approx.154 (W) × 81 (H) × 154 (D) mm (projection excluding)Approx.1.0 kg (BUD-8000(S) when in use)/
Approx.1.1 kg (BUL-8000(S), BUL-8000(S1) when in use)
* Specifications subject to changes without notice.

- 46 -

9 Product Specifications

9-1. List of specifications<ATEX/IECEx Specification>
Detection principle
Detectable gas
Gas concentration display
Measuring range
Detection method
Suction flow
Alarm preset point
Various indications
Alarm soundAlarm accuracy

Electrochemical type
Toxic gas
LCD (digital)
Depend on Detectable gas
Pump suction method
Above 0.5 L/min
Depend on Detectable gas
Gas/Battery condition/Pilot indicator/Flow indicator
Above 95 dB (A) (30 cm)
Less than ±30 % (against alarm preset point)(under an identical condition)

Alarm-delay timeLess than 60 sec (when introducing 1.6 times thicker gas than alarm preset point)(under an identical condition)

Gas alarm typeGas alarm indication
Gas alarm action
Trouble alarm・Self diagnosis
Trouble alarm indication
Trouble alarm action
Specification of transmission
Various functions
Power supply
Continuous operation time
Operating temperature
Operating humidity
Structure
Explosion-proof structure
Explosion-proof grade
Outer dimension
WeightTwo-level alarm(H-HH)/OVER
Lamp blinking/Intermittent buzzer/Gas concentration display blinking
Latched
System failure/Sensor failure/Low Battery/Calibration failure/Flow failure
Lamp blinking/Intermittent buzzer/Content display
LatchedIrDA
LCD backlight/Data logger/Peak hold/Average/Logged data display/Beep select/Date
Dedicated dry battery unit <three AA batteries>【BUD-8000(S)】(Lithium ion battery unit【BUL-8000(S)】, 【BUL-8000(S1)】 are available.)
BUD-8000(S): Approx. 18 hours (25 °C・Non alarm operation)
BUL-8000(S), BUL-8000(S1): Approx. 25 hours (25 °C・Non alarm operation・After full charge)-10 - 40 °C (non-rapidly-vary. It may differ according to mounted sensor.)
30 - 70 %RH (non-condensing. It may differ according to mounted sensor.)
Dust and Water-proof Structure(IP67)
Intrinsically safe structure
Ⅱ1 G Ex ia ⅡC T4 Ga(ATEX) / Ex ia ⅡC T4 Ga(IECEx)
Approx.154 (W) × 81 (H) × 154 (D) mm (projection excluding)Approx.1.0 kg (BUD-8000(S) when in use)/
Approx.1.1 kg (BUL-8000(S), BUL-8000(S1) when in use)
* Specifications subject to changes without notice.

- 47 -

SC-8000

9 Product Specifications

9-2. List of accessories

9-2. List of accessories
Standard
accessories

 Dry battery unit (BUD-8000 (S))
 Shoulder strap Sampling probe

Optional
accessories













SC-8000

Lithium ion battery unit (BUL-8000 (S), BUL-8000 (S1))
AC powered charger for BUL-8000(S), BUL-8000(S1)Dust filter for sampling probe
Waist strap
Waist strap fixing tool
Sampling probe holder
Activated carbon filter tube (with relay tube)
Filter tube (NOx removal) (with relay tube)
Filter tube fixing belt
Aluminum trunk case
Data logger management program- 48 -

10 Definition of Terms

10

Definition of Terms
ppm

Gas concentration indicated in the unit of one-millionth of the volume- 49 -

SC-8000