H4E-0050
Portable Gas Monitor
GX-8000
User Maintenance Manual
(H4-0050)
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 these 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
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 the performance as a safety unit.
Maintenance |
Maintenance content |
Daily |
Monthly |
Regular |
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item |
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maintenance |
maintenance |
maintenance |
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Battery level |
Check that the battery level is sufficient. |
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check |
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Concentration |
Make the gas monitor draw in fresh air. Check |
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display check |
that the concentration display value is zero (or |
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20.9 vol% on the oxygen deficiency meter). |
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When the reading is incorrect, perform the zero |
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adjustment (fresh air adjustment) after ensuring |
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that no other gases exist around it. |
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Flow rate check |
See the flow rate indicator to check for |
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abnormalities. |
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Filter check |
Check the dust filter for dust or clogging. |
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Alarm test |
Check the alarm lamp and buzzer for normal |
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operation by using the alarm test function. |
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Span adjustment |
Perform the span adjustment by using the |
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calibration gas. |
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Gas alarm check |
Check the gas alarm by using the calibration gas. |
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GX-8000 |
- 2 - |
2 Regular Maintenance Mode
2
Regular Maintenance Mode
Regular maintenance mode is an operation (adjustment) mode in which span adjustment and setup such as change of alarm setpoints can be performed.
WARNING
After the adjustment is completed, do not forget to return to the detection mode.
(If the gas monitor remains in the regular maintenance mode, it does not automatically return to the detection mode.)
The regular maintenance mode comes in two types: Calibration and maintenance modes. To enter the calibration mode, press the DISPLAY switch with the T switch pressed in the detection mode and release them when the buzzer sounds. To enter the maintenance mode, press the POWER switch with the S and T 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.
- 3 - |
GX-8000 |
2 Regular Maintenance Mode
The regular maintenance mode has the menus shown below.
Mode |
Item |
LCD display |
Details |
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Calibration |
Fresh air adjustment |
AIR CAL |
Perform the fresh air adjustment. |
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mode |
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Zero adjustment for |
VOLZ.CAL |
Perform the zero adjustment for |
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high-concentration |
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high-concentration combustible |
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combustible gases |
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gases. |
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Simultaneous span |
AUTO CAL |
Perform the span adjustment |
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adjustment for all channels |
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simultaneously for all channels. |
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Span adjustment for each |
ONE CAL |
Perform the span adjustment for |
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channel |
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each channel. |
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Bump test |
BUMP |
Perform the bump test. |
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Exit calibration mode |
NORMAL |
Exit the calibration mode and |
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return to the detection mode. |
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Maintenance |
Date/time setting |
DATE |
Set the date and time. |
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mode |
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Fresh air adjustment |
AIR CAL |
Perform the fresh air adjustment. |
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Zero adjustment for |
VOL Z.CAL |
Perform the zero adjustment for |
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high-concentration |
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high-concentration combustible |
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combustible gases |
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gases. |
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Simultaneous span |
AUTO CAL |
Perform the span adjustment |
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adjustment for all channels |
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simultaneously for all channels. |
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Span adjustment for each |
ONE CAL |
Perform the span adjustment for |
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channel |
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each channel. |
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Bump test |
BUMP |
Perform the bump test. |
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Alarm setting |
ALARM-P |
Change the alarm setpoint value. |
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Bump test setting |
BUMP-SET |
Set the bump test. |
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Beep setting |
BEEP SET |
Set the confirmation beep |
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operation. |
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Exit maintenance mode |
START |
Exit the maintenance mode and |
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enter the detection mode. |
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*mark indicates items that can be operated (adjusted) in other modes such as [Detection mode] than the regular maintenance mode. Note that operation can be performed in any mode.
**mark indicates the menus in the calibration modes available in the overseas specification: AUTO CAL, ONE CAL, BUMP, and NORMAL.
***mark indicates the items not available in the Japanese specifications.
NOTE
If any mode that is not described in this manual or Operating Manual (main manual) (any mode but the regular maintenance mode) is entered by mistake, turn off the power once and try again.
GX-8000 |
- 4 - |
2 Regular Maintenance Mode
<<Calibration Mode>>
In the detection mode, keep T pressed and press the DISPLAY switch. When the buzzer beeps, release the switches.
Calibration mode
AIR CAL
Perform the fresh air adjustment.
VOLZ.CAL
Perform the zero adjustment for high-concentration combustible gases.
AUTO CAL
Perform the span adjustment simultaneously for all channels.
(Set the span gas concentration in advance and make adjustment at once.)
ONE CAL
Perform the span adjustment for each channel. (While gas is supplied, perform span adjustment using UP/DOWN.)
BUMP
Perform the bump test.
NORMAL
Exit the calibration mode.
Fresh air adjustment => P16
Zero adjustment for highconcentration combustible gases
=> P20
Simultaneous span adjustment for all channels
=> P18
Span adjustment for each channel
=> P19
Bump test => P6
Detection mode
- 5 - |
GX-8000 |
2 Regular Maintenance Mode
<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.
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Gas sampling probe GAS IN |
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(with a tube) |
Gas |
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sampling |
GAS OUT |
(Open)
bag
GX-8000 main unit
WARNING
About the bump test gas
The bump test gas is a hazardous gas (toxic, oxygen deficient, etc.). Handle the gas and related jigs and tools with due care (e.g., the gas must not be inhaled or the gas sampling bag must not have any hole).
About the place for span adjustment
•Perform span adjustment where no silicon, organic solvent, spray can gases, etc. are used.
•Perform span adjustment indoors at normal temperature without remarkable fluctuation (within ±5°C).
•Perform span adjustment in an exhaust booth.
CAUTION
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.
GX-8000 |
- 6 - |
2 Regular Maintenance Mode
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. Simultaneous span adjustment for all channels
=> P18
Supply the test gas.
Supply the test gas and press ENTER. BUMP and APPLY are displayed alternately, and the countdown is started.
Go to (1) if all the channels are Pass in about 30 seconds. Go to (2) if any of the channels is Fail.
NOTE
Only on TYPE-A and TYPE-E, every time the S or T switch is pressed, the concentration of the span gas for high-concentration combustible gases is displayed alternately.
<If all the channels are Pass>
The result is displayed in about 30 seconds. Stop supplying the gas.
The results and values are displayed alternately every time the S or T switch is pressed.
P: Pass, F: Fail
After checking the result, press ENTER. The gas monitor returns to the calibration mode menu.
(1)
Return to |
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Stop supplying |
BUMP. |
the test gas. |
- 7 - |
GX-8000 |
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