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.