Riken Keiki SC-8000 Operating instructions

H4E-0110
Portable Toxic Gas Monitor
SC-8000
User Maintenance Manual
Need of Maintenance and Servicing
This gas monitor must be maintained in a normal state at all times to prevent accidents due to gas
leaks.
Daily and regular maintenance is required to keep the gas monitor in a normal state. Neglecting
maintenance will result in failures and false alarms.
The specified maintenance procedures must be performed for the sake of maintenance of a
normal state.
Also, maintenance by the manufacturer (comprehensive maintenance) should be performed in
addition to the maintenance specified in this manual.
This manual complements the Operating Manual (main manual). Be sure to read and understand
thoroughly both this manual and the Operating Manual including precautions to ensure proper use
of this gas monitor.

1 Maintenance Intervals and Items
SC-8000 - 2 -
1
Maintenance Intervals and
Items
•Daily maintenance: Perform maintenance before beginning to work.
•Monthly maintenance: Perform alarm test once a month.
•Regular maintenance: Perform maintenance once or more every six months to maintain the
performance as a safety unit.
Maintenance
item Maintenance content Daily maintenance
Monthly
maintenance
Regular
maintenance
Battery Level
Check Check that the battery level is sufficient. 
Concentration
Display Check
Make the gas monitor draw in fresh air
and check that the concentration display
value is zero. When the reading is
incorrect, perform the zero adjustment
after ensuring that no other gases exist
around it.

Flow Rate
Check See the flow rate indicator to check for abnormalities. 
Filter Check Check the dust filter for dust or clogging.

Alarm Test Check the alarm lamp and buzzer for
normal operation using the alarm test
function. 
Span
Adjustment Perform the span adjustment by using the calibration gas. 
Gas Alarm
Check Check the gas alarm by using the calibration gas. 

2 Maintenance Mode
- 3 - SC-8000
2
Maintenance Mode
Maintenance mode is an operation (adjustment) mode in which span adjustment and setup such as change
of alarm setpoints can be performed.
To enter the maintenance mode, press the POWER switch with the ▲and ▼switches pressed at power-on
and release them when the buzzer sounds. The maintenance mode is password-protected. The input of a
password is needed in the beginning.
The maintenance mode provides the following menu.
Mode Item LCD display
Details
Date/time setting DATE Set the date and time.
Zero adjustment AIR CAL Perform the zero adjustment. *
Automatic span adjustment AUTO CAL Perform the span adjustment automatically to a set concentration
value.
Manual span adjustment ONE CAL Perform the span adjustment manually.
Bump test BUMP Perform the bump test.
Alarm setting ALARM-P Change the alarm setpoint value.
Bump test settings BUMP-SET Set the bump test.
Beep setting BEEP SET Set the running check operation.
K No. display K No. ------- **
Maintenance
Mode
Exit maintenance mode START Enter the measuring mode.
* This mark indicates the item that can be operated (adjusted) in the measuring mode. The
operation can be performed in either mode.
** This is not required for normal maintenance.
NOTE
If any mode that is not described in this manual or the Operating Manual (main manual) (any mode other
than the maintenance mode) is entered by mistake, turn off the power once and then try again.
WAR I G
After the adjustment is completed, never fail to return to the measuring mode.
(If the gas monitor remains in the maintenance mode, it does not automatically return to the
measuring mode.)

2 Maintenance Mode
SC-8000 - 4 -
<Bump Test "BUMP">
Required equipment/material
•Bump test gas (collected in a gas sampling bag)
Connection
Connect the equipment as shown below to perform the bump test.
Gas
sampling
bag Main unit
SC-8000
GAS IN
GAS OUT
(Open)
Sampling probe
CAUTIO
The GAS OUT side of the pipe must be left open without any pipe connected. A supplied gas must
be discharged to a safe place.
WAR I G
About the bump test gas
The bump test gas is a hazardous gas (toxic, oxygen deficient, etc.) therefore handle the gas and
related jigs and tools with due care. (Inhaling the gas must be avoided, the gas sampling bag must
be free of holes, etc.)
About the place for span adjustment
•Perform span adjustment where no silicon, organic solvent, spray can gases, etc. is used.
•Perform span adjustment indoors at normal temperatures without remarkable fluctuation (within
±5°C).
•Perform span adjustment in an exhaust booth.

2 Maintenance Mode
- 5 - SC-8000
BUMP
Press the ENTER switch.
The bump test gas concentration is displayed.
The concentration of the prepared test gas must
be consistent with the displayed test gas
concentration.
To change the test gas concentration value,
change the value in span adjustment menu. The
test gas concentration is set to the same value as
the span gas concentration. Automatic span
adjustment => P15
Supply the test gas and press ENTER.
BUMP and APPLY are displayed alternately, and
the countdown is started.
Supply test gas
Goes to (1) when passed or
(2) when failed after countdown
(1)
<When passing the test>
The result is displayed after the countdown finishes.
Stop supplying the test gas. The results and values
are displayed alternately every time the ▲or ▼
switch
is pressed.
P: Pass, F: Fail
Stop supplying
test gas
After checking the result, press ENTER. The gas
monitor returns to the maintenance mode menu. Return to BUMP.

2 Maintenance Mode
SC-8000 - 6 -
NOTE
If "F" (Fail) is displayed after the span adjustment, replace the sensor with a new one.
<When failing the test>
Continue supplying the gas. The result is not
displayed, and the span adjustment is automatically
started. CAL and APPLY are displayed alternately,
and the countdown is started.
(2)
Continue supplying
test gas
Stop supplying
test gas
The span adjustment is started after the countdown
finishes, and the result is displayed. Left: Test result,
Right: Adjustment result (P: Pass, F: Fail)
The results (P or F) <-> bump test result values <->
span adjustment result values are displayed
alternately every time the ▲or ▼switch is pressed.
Stop supplying the gas.
After checking the result, press ENTER.
The gas monitor returns to the calibration
mode menu.
Return to BUMP.

2 Maintenance Mode
- 7 - SC-8000
<<Maintenance Mode>>
The maintenance mode includes setting menus which are usually not used. Be careful not to change these
settings by mistake. It is recommended that the set values be recorded before changing them.
Keep the ▲and ▼
switches pressed and press the
POWER switch. When the buzzer beeps, release
the switches.
The input field blinks. Press the ▲or ▼switch to
select a number and press ENTER to confirm it.
Enter four digits from the left.
Password: 0008
Maintenance Mode
DATE
Set the date and time.
AIR CAL
Perform the zero adjustment.
AUTO CAL
Perform the span adjustment automatically.
(Set the span gas concentration in advance and
make adjustment.)
ONE CAL
Perform the span adjustment manually.
(While gas is supplied, perform the span adjustment
using UP/DOWN.)
Date/Time Setting => P9
Zero Adjustment => P13
Automatic Span
Adjustment => P15
Manual Span Adjustment
=> P16

2 Maintenance Mode
SC-8000 - 8 -
BUMP
Perform the bump test.
ALARM-P
Set the alarm setpoint.
BUMP-SET
Check or set the bump test conditions.
BEEP SET
Set whether or not to perform the confirmation beep
operation.
Press the ▲or ▼switch to select ON or OFF and
press the ENTER switch to confirm it.
K No.
Display K No. of the sensor.
START
Exit the maintenance mode.
Bump Test => P4
Alarm Setpoint Setting
=> P10
Bump Test Setting
=> P11
*
No change is
required for normal
maintenance.
Press ENTER to enter
the measuring mode.

2 Maintenance Mode
- 9 - SC-8000
<Date/Time Setting "DATE">
Set the date/time.
DATE
Press the ENTER switch.
The input field blinks. Enter the year, month, day, hour,
and minute in this order. Press the ▲or ▼switch to
adjust the date and time and press the ENTER switch to
enter it.
(The figure on the right shows an example of input for
2011/01/07 19:32.)
Once the last part (minute) is entered, the date/time
setting is confirmed. After END is displayed, the gas
monitor automatically returns to the maintenance
mode menu.
Return to DATE.

2 Maintenance Mode
SC-8000 - 10 -
<Alarm Setpoint Setting "ALARM-P">
Set the alarm setpoint.
ALARM-P
Press the ENTER switch.
The alarm setpoint setting selection menu is
displayed.
Press the ENTER switch. The alarm setpoint
display blinks, prompting for input.
Press the ▲or ▼switch to change an alarm
setpoint value. Next, press the ENTER switch to
enter it.
Set WARNING and then ALARM.
Change the last item and press the ENTER switch.
After the changed settings are confirmed and END
is displayed, the gas monitor automatically returns
to the alarm setpoint setting selection menu.
When the alarm setpoint setting is completed, press
the ▲or ▼
switch until ESCAPE is displayed. Press
the ENTER switch to return to the maintenance
mode menu.
Return to ALARM-P.

2 Maintenance Mode
- 11 - SC-8000
<Bump Test Setting "BUMP-SET">
Check and set the setting items related to the bump test.
BUMP-SET
Press the ENTER switch.
Press the ▲or ▼switch to display a target setting
item to be checked or set.
The test time is displayed.
Press the ENTER switch. The numeric display blinks,
prompting for input. Press the ▲or ▼switch to enter
introduction time. Press the ENTER switch to confirm it.
The figure on the right shows an example of 30
seconds.
(Test time: 30, 45, 60, or 90 seconds)
The test pass tolerance range is displayed.
Press the ENTER switch. The numeric display blinks,
prompting for input. Press the ▲or ▼switch to enter a
range. Press the ENTER switch to confirm it.
The figure on the right shows an example of range
within ±30%.
(Pass range: Within ±10%, ±20%, ±30%, ±40%, or
±50%)
The adjustment time after test fail is displayed.
Press the ENTER switch. The numeric display blinks,
prompting for input. Press the ▲or ▼switch to enter
adjustm
ent time. Press the ENTER switch to confirm it.
The figure on the right shows an example of 60
seconds.
Whether or not to enable automatic adjustment after
test fail is displayed.
Press the ENTER switch. The ON (OFF) display blinks,
prompting for input. Press the ▲or ▼switch to select
ON or OFF. Next, press the ENTER switch to confirm it.
ON: Automatic adjustment enabled OFF: Automatic
adjustment disabled.
The figure on the right shows an example of ON
setting.
When the setting is completed, press the ▲or ▼
switch until ESCAPE is displayed. Press the ENTER
switch to return to the maintenance mode menu.
Return to BUMP-SET.

3 Span Adjustment 3-1. Preparation for span adjustment
SC-8000 - 12 -
3
Span Adjustment
3-1. Preparation for span adjustment
Required equipment/material
•Span gas (collected in a gas sampling bag)
•Stopwatch
Connection
Connect the equipment as shown below to perform the span adjustment.
Gas
sampling
bag Main unit
SC-8000
GAS IN
GAS OUT
(Open)
Sampling probe
WAR I G
About the span gas
The span gas is a hazardous gas (toxic, oxygen deficient, etc.) therefore handle the gas and related
jigs and tools with due care. (Inhaling the gas must be avoided, the gas sampling bag must be free
of holes, etc.)
About the place for span adjustment
•Perform span adjustment where no silicon, organic solvent, spray can gases, etc. is used.
•Perform span adjustment indoors at normal temperatures without remarkable fluctuation (within
±5°C).
•For span adjustment, the GAS OUT side of the pipe must be left open without any pipe
connected. Make sure to supply a gas in an exhaust booth and discharge the gas to a safe
place.

3 Span Adjustment 3-2. Zero Adjustment
- 13 - SC-8000
<Adjustment Procedure>
Perform adjustment using the procedure shown below.
Warm up the gas monitor for 60 minutes or longer before performing the fresh air
adjustment to ensure more accurate adjustment.
NOTE
Before starting the span adjustment, let the gas monitor draw the gas and wait until the readings are
stabilized.
3-2. Zero Adjustment
NOTE
If the existence of other gases is suspected in the atmosphere before performing the zero adjustment,
collect fresh air in a gas sampling bag separately and perform the adjustment supplying fresh air in the
same way as for the span adjustment.
(1) Zero adjustment (AIR CAL)
(2) Span adjustment (AUTO CAL or ONE CAL)
End of span adjustment
WAR
I G
When the zero 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.
WAR I G
When the zero 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.

3 Span Adjustment 3-2. Zero Adjustment
SC-8000 - 14 -
AIR CAL
Press the ENTER switch.
The current c
oncentration readings of the gases are
displayed. Press the AIR switch when they are
stabilized.
When the AIR switch is pressed, HOLD AIR is
displayed. Keep pressing the switch until RELEASE
is displayed.
Release the AIR switch.
After the fresh air adjustment is successfully
completed and END is displayed, the gas monitor
automatically returns to the menu.
Return to AIR CAL.

3 Span Adjustment 3-3. Span Adjustment
- 15 - SC-8000
3-3. Span Adjustment
<Automatic Span Adjustment (AUTO CAL)>
AUTO CAL
Press the ENTER switch.
The test gas concentration is displayed.
It needs to be consistent with the concentration of
the prepared test gas. To change the value, press
the ▼and DISPLAY switches simultaneously.
The span adjustment concentration setting menu is
displayed.
<Span Adjustment
Concentration Setting>
Press the ENTER switch. The span adjustment
concentration display blinks, prompting for input.
Press the ▲or ▼switch to change the span
adjustment concentration setting.
After the ENTER switch is pressed to confirm the
changed setting and END is displayed, the gas
monitor automatically returns to the span
adjustment concentration setting menu. When the
spa
n adjustment concentration setting is completed,
press the ▲or ▼sw
itch until ESCAPE is displayed.
Press ENTER to return to the original screen.
While the span adjustment concentration is
displayed, press the MODE switch to cause AUTO
CAL display to blink and display the current
concentration readings (prompting for supply).
Prepare and supply the test gas.
When the readings are stabilized 120 seconds after
supplying the test gas, press the ENTER switch to
perform adjustment.
After the adjustment is successfully completed and
PASS is displayed, the gas monitor automatically
returns to the menu. Stop supplying the gas.
Return to AUTO CAL.
Supply test gas
Stop supplying
test gas
The changed value is saved. From next
time, the changed value is displayed in
the beginning.

3 Span Adjustment 3-3. Span Adjustment
SC-8000 - 16 -
<Manual Span Adjustment (ONE CAL)>
ONE CAL
Press the ENTER switch.
The span adjustment selection menu is displayed.
Press the ENTER switch to cause the concentration
display to blink and display the current
concentration readings (prompting for supply).
Prepare and supply the test gas.
Whe
n the readings are stabilized 120 seconds after
supplying the test gas, press the ▲or ▼switch to
adjust to the gas concentration.
Press the ENTER switch to adjust it.
After END is displayed, the gas monitor
automatically returns to the manual span
adjustment menu. Stop supplying the test gas.
When the span adjustment is completed, press the
▲or ▼switch until ESCAPE is displayed.
Press the ENTER switch to return to the menu.
Return to ONE CAL.
Supply test gas
Stop supplying
test gas

4 Replacement of Consumable Parts
- 17 - SC-8000
4
Replacement of
Consumable Parts
<Sensor Replacement Procedure>
Note: Do not turn the main unit upside down for a long time. (At most one minute as a guide)
After a sensor is replaced, energize the sensor for at least two hours before performing calibration.
Check that a replacement has the same type of gas, the same model and measurement range as the
sensor currently used.
Attaching an inappropriate sensor causes malfunction.
(1) Loosen the two screws at the bottom of the lower case and remove the battery unit.
(2) Loosen the two screws of the internal case cover and remove the cover.
(3) Remove the sensor connector and then pull out the sensor part by holding the knob of the sensor joint.
(4) Remove the sensor and sensor joint from the sensor cap.
Battery unit Internal case cover
Sensor cap
Sensor part
Sensor joint

4 Replacement of Consumable Parts
SC-8000 - 18 -
(5) Attach the sensor joint and a new sensor to the sensor cap in reverse order of sensor removal.
Insert the connector of the sensor cable to a new sensor and attach the sensor to the main unit. At this
time, be careful not to let the sensor cable be caught by the amplifier board. For the sensor with a
conversion factor label attached, tear off the product side of the label beforehand.
(6) Put the internal case cover and battery unit back in place.
For the sensor with a conversion factor label attached, peel off the conversion factor label (product
side) removed from the new sensor from release paper and then attach the label in place of the one on
the internal case cover.
(7) Turn the power ON. When "SENSOR CHANGE" is displayed, press the POWER ENTER switch to see
if the measuring mode is entered. (If the display does not appear, reattach the sensor.)
(8) Turn the power OFF and then start up in the maintenance mode again.
Perform a zero adjustment and then a span calibration.
<Replacement Procedure for Other Consumable Parts>
For the stable operation of the gas monitor and safety, a qualified service engineer is required to take care
of the replacement of the parts that requires high expertise.
Please contact RIKEN KEIKI.
Tear off
CL
2
x 1.8
Conversion
factor label