RKI Instruments GX-8000 User Manual

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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 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)

both this manual and the Operating Manual including precautions to ensure proper use of this gas monitor.

is required to keep the gas monitor in a normal state. Neglecting maintenance will

. Be sure to read and understand thoroughly

1 Maintenance Intervals and Items

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

item

Battery level check

Concentration display check

Flow rate check See the flow rate indicator to check for

Filter check Check the dust filter for dust or clogging. { { {

Alarm test Check the alarm lamp and buzzer for normal

Span adjustment Perform the span adjustment by using the

Gas alarm check Check the gas alarm by using the calibration gas. {

Check that the battery level is sufficient. { { {

Make the gas monitor draw in fresh air. Check that the concentration display value is zero (or

20.9 vol% on the oxygen deficiency meter). When the reading is incorrect, perform the zero adjustment (fresh air adjustment) after ensuring that no other gases exist around it.

abnormalities.

operation by using the alarm test function.

calibration gas.

Maintenance content Daily

maintenance

{ { {

{ {

{

Monthly

maintenance

Regular

maintenance

GX-8000 - 2 -

2 Regular Maintenance Mode

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

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.

, press the DISPLAY switch with the T switch pressed in the detection mode and release

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2 Regular Maintenance Mode

The regular maintenance mode has the menus shown below.

Mode Item LCD display Details

Calibration mode

Maintenance mode

Fresh air adjustment AIR CAL Perform the fresh air adjustment. * Zero adjustment for

high-concentration combustible gases

Simultaneous span adjustment for all channels

Span adjustment for each channel

Bump test BUMP Perform the bump test. ** Exit calibration mode NORMAL Exit the calibration mode and

Date/time setting DATE Set the date and time. Fresh air adjustment AIR CAL Perform the fresh air adjustment. * Zero adjustment for

high-concentration combustible gases

Simultaneous span adjustment for all channels

Span adjustment for each channel

Bump test BUMP Perform the bump test. *** Alarm setting ALARM-P Change the alarm setpoint value. Bump test setting BUMP-SET Set the bump test. *** Beep setting BEEP SET Set the confirmation beep

Exit maintenance mode START Exit the maintenance mode and

* 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.

VOLZ.CAL Perform the zero adjustment for

high-concentration combustible gases.

AUTO CAL Perform the span adjustment

simultaneously for all channels.

ONE CAL Perform the span adjustment for

each channel.

return to the detection mode.

VOL Z.CAL Perform the zero adjustment for

high-concentration combustible gases.

AUTO CAL Perform the span adjustment

simultaneously for all channels.

ONE CAL Perform the span adjustment for

each channel.

operation.

enter the detection mode.

***

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.)

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 Perform the bump test.

NORMAL Exit the calibration mode.

Bump test => P6

Detection mode

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2 Regular Maintenance Mode

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

Gas sampling probe

(with a tube)

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.

GAS IN

GAS OUT

(Open)

GX-8000 main unit

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

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.

NOTE

test gas.

Supply the test gas and press ENTER. BUMP and APPLY are displayed alternately, and the countdown is started.

<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.

Go to (1) if all the channels are Pass in about 30 seconds. Go to (2) if any of the channels is Fail.

(1)

Return to BUMP.

Stop supplying the test gas.

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2 Regular Maintenance Mode

Continue

(2)

supplying the test gas.

<If any of the channels is Fail> 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.

The span adjustment is started in about 30 seconds, 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 S or T switch is pressed. Stop supplying the gas.

Return to BUMP.

After checking the result, press ENTER. The gas monitor returns to the calibration mode menu.

Stop supplying the test gas.

NOTE

If "F" (Fail) is displayed after the span adjustment, replace the sensor with a new one.

GX-8000 - 8 -

2 Regular Maintenance Mode

<<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 setting changes should be recorded in a log.

Keep the S and T switches pressed and press the POWER switch. When the buzzer beeps, release the switches.

The input field blinks. Press the S or T switch to select a number and press ENTER to confirm it. Enter four digits from the left.

Password: 0008

Regular maintenance mode DATE Set the date and time.

AIR CAL Perform the fresh air adjustment.

VOL Z.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.)

Date/time setting => P11

Fresh air adjustment => P16

Zero adjustment for highconcentration combustible gases => P20

Simultaneous span adjustment for all channels => P18

ONE CAL Perform the span adjustment for each channel. (While gas is supplied, perform span adjustment using UP/DOWN.)

Span adjustment for each channel => P19

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2 Regular Maintenance Mode

BUMP Perform the bump test.

ALARM-P Set the alarm setpoint.

BUMP-SET Set the bump test.

BEEP SET Set whether or not to perform the confirmation beep operation. Press the S or T switch to select ON or OFF and press the ENTER switch to confirm it.

Bump test => P6

Alarm setpoint setting => P12

Bump test settings => P13

START Exit the maintenance mode.

Press ENTER to enter the detection mode.

GX-8000 - 10 -

2 Regular Maintenance Mode

<<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 S or T 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.)

As soon as 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.

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2 Regular Maintenance Mode

Set the alarm setpoint.

ALARM-P Press the ENTER switch.

The alarm setpoint setting selection menu is displayed. Press the S or T switch to display a target gas for which the alarm setpoint should be set. Every time the S or T switch is pressed, the target gas is changed (in the order of Combustible, O2, H2S, CO, and ESCAPE).

While a desired target gas is selected, press the Enter switch to cause the alarm setpoint display to blink, prompting for input.

Press the S or T switch to change an alarm setpoint value. Next, press the ENTER switch to enter it.

Continue to set WARNING, ALARM, STEL, and TWA in this order. (Set the STEL and TWA alarms only for CO and H

S.)

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 (*). Repeat the same procedure to set other target gases.

When the alarm setpoint setting is completed, press the S or T switch until ESCAPE is displayed. Press the ENTER switch to return to the maintenance mode menu.

Return to ALARM-P.

GX-8000 - 12 -

2 Regular Maintenance Mode

Check and set the setting items related to the bump test.

BUMP-SET Press the ENTER switch. Press the S or T 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 S or T 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 S or T switch to ente 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 S or T switch to ente adjustment 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 S or T 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 S or T switch until ESCAPE is displayed. Press the ENTER switch to return to the maintenance mode menu.

Return to BUMP-SET.

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3 Span Adjustment 3-1. Preparation for span adjustment

Span Adjustment

3-1. Preparation for span adjustment

Required equipment/material

• Zero adjustment gas for high-concentration combustible gases (collected in a gas sampling bag)

• Span adjustment gas (collected in a gas sampling bag)

• Stopwatch

Connection

Connect the equipment as shown below to perform the span adjustment.

WARNING

About the span adjustment gas The span adjustment 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.

Gas

sampling

bag

Gas sampling probe

(with a tube)

GAS IN

GAS OUT

(Open)

GX-8000 main unit

GX-8000 - 14 -

3-1. Preparation for span adjustment 3 Span Adjustment

Perform adjustment using the procedure shown below.

WARNING

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.

CAUTION

Only Type-A, E *1 Perform adjustment in the following order: "fresh air adjustment, span adjustment, zero adjustment

(1) Fresh air adjustment (AIR CAL) *1

Warm up the gas monitor for 60 minutes or longer before performing the fresh air adjustment to ensure more accurate adjustment.

(2) Span adjustment (AUTO CAL or ONE CAL) *1

The gases may be introduced in random order.

• Combustible gas (%LEL) gas *1

• O

• CO gas

• H

S gas

(3) Zero adjustment for high-concentration combustible gases (VOL Z.CAL) (only TYPE-A, E) *1

• N

gas

(4) Span adjustment for high-concentration combustible gases (AUTO CAL or ONE CAL) (only

TYPE-A, E) *1

• Combustible gas (vol%)

End of span adjustment

for high-concentration combustible gases, and span adjustment for high-concentration combustible gases. The sensor for high-concentration combustible gases has different outputs depending on whether the base gas is air or N2. Performing adjustment in any different order than the above adversely influences the reading taken when a combustible gas (vol%) is drawn in.

NOTE

Before starting the adjustment, let the gas monitor draw the gas and wait until the readings are stabilized.

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3 Span Adjustment 3-2. Fresh air adjustment

3-2. Fresh air adjustment

WARNING

NOTE

If the existence of other gases in the atmosphere is suspected before performing the fresh air adjustment, collect fresh air in the gas sampling bag and perform the adjustment using a gas supply adapter in the same way as for the span adjustment.

GX-8000 - 16 -

3-2. Fresh air adjustment 3 Span Adjustment

AIR CAL

Press the ENTER switch.

The current concentration 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. * Only on TYPE-A and TYPE-E, a 30-second

countdown is started. No countdown is started on other types.

After the fresh air adjustment is successfully completed and END is displayed, the gas monitor automatically returns to the menu.

Return to AIR CAL.

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3 Span Adjustment 3-3. Span adjustment

3-3. Span adjustment

AUTO CAL Press the ENTER switch.

<Span Gas Concentration

Setting>

The span gas concentration is displayed. It needs to be consistent with the concentration of the prepared span gas. To change the value, press the T and DISPLAY switches simultaneously. The span gas concentration setting menu displayed. Press the S or T switch to display a target gas for which the span gas concentration should be changed. Every time AIR is pressed, the target gas is changed (in the order of Combustible, O2, H2S, CO, and ESCAPE).

[Setting repeated for each gas]

While a desired target gas is selected, press the ENTER switch to cause the span gas concentration display to blink, prompting for input. Press the S or T switch to change the span gas concentration setting.

fter the ENTER switch is pressed to confirm the changed setting and END is displayed, the gas monitor automatically returns to the span gas concentration setting menu. Repeat the same procedure to set other target gases. When all of the span gas concentration setting is completed, press the ▲ or ▼ switch until ESCAPE is displayed. Press ENTER to return to the original screen.

While the span gas concentration is displayed, press the MODE switch to cause AUTO CAL to blink and display the current concentration readings (prompting for supply). Prepare and supply the span gas.

In 60 seconds after supplying the span gas when the readings are stabilized, press the ENTER switch to perform adjustment.

The changed value is saved.

NOTE

From next time, the changed value is displayed in the beginning.

Supply the span gas.

fter the adjustment is successfully completed and PASS is displayed, the gas monitor automatically returns to the menu. Stop supplying the gas.

Stop supplying

Return to AIR CAL.

GX-8000 - 18 -

the span gas.

3-3. Span adjustment 3 Span Adjustment

ONE CAL Press the ENTER switch.

The span adjustment selection menu is displayed. Press the S or T switch to display a target gas for which the span adjustment should be performed. Every time the S or T switch is pressed, the target gas is changed (in the order of Combustible, O2, H2S, CO, and ESCAPE).

While a desired target gas is selected, press the ENTER switch to cause the concentration display to blink and display the current concentration readings (prompting for supply). Prepare and supply the span gas.

Supply the span gas.

In 60 seconds after supplying the span gas when the readings are stabilized, press the S or T switch to adjust to the gas concentration.

Press the ENTER switch to adjust it.

fter END is displayed, the gas monitor automatically returns to the span adjustment for each channel menu (*). Stop supplying the gas. Repeat the same procedure to adjust other target gases.

When all of the span adjustment is completed, press the S or T switch until ESCAPE is displayed. Press the ENTER switch to return to the menu.

Return to ONE CAL.

Stop supplying the span gas.

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3 Span Adjustment 3-3. Span adjustment

<High-concentration Combustible Gas Zero Calibration "VOLZ.CAL"> (Only TYPE-A, E)

VOL Z.CAL Press the ENTER switch.

The VOL Z.CAL display blinks. Until the combustible gas range switches to VOL%, the combustible gas concentration is displayed as ---.

The current concentration readings of the combustible gas and oxygen are displayed (prompting for supply). Prepare and supply the zero gas.

Supply the zero gas.

In about 60 seconds after supplying the zero gas when the readings are stabilized, press the ENTER switch to perform adjustment.

After the zero adjustment is successfully completed and END is displayed, the gas monitor automatically returns to the menu.

Return to VOL Z.CAL

Stop supplying the zero gas.

GX-8000 - 20 -

4 Replacement of Consumable Parts

Replacement of

Consumable Parts

(1) Loosen the four screws on the sensor cover and remove the sensor cover. (2) Remove the sensor rubber seal.

Take care not to damage the sensor rubber seal and the seal surface inside the sensor cover that comes into contact with the rubber seal.

Sensor cover

(3) Replace the sensor.

Pay attention to the installation direction of the sensors. Check that the pins of the sensors are inserted firmly all the way (that the sensors have equal heights). Also, replace the rubber seals as required. Handle the rubber seals with care because any damage on them will impair the waterproof property.

H2S sensor

sensor

Captive screws (four)

NC (%LEL) sensor

CO sensor

TE(vol%) sensor

Sensor rubber seal Peel it off if it sticks to the sensor cover.

GX-8000 - 21 -

4 Replacement of Consumable Parts

(4) Using an opposite procedure to the above, install the sensor rubber seal and fix the sensor cover.

Screw tightening torque: 5 to 5.5 kgf･cm (49 to 54 N･cm)

Sensor rubber seal

Install the rubber seal so that the concave part covers the sensor.

Sensor

Install the sensor cover horizontally so as not to warp the sensor rubber seal.

For the stable operation of the gas monitor and safety, a qualified service engineer is required to take care of replacement of the parts that requires high expertise. Please contact RIKEN KEIKI.

GX-8000 - 22 -

Warranty Policy

RIKEN KEIKI CO., LTD., warrants gas alarm equipment sold by us to be free from defects in materials, workmanship, and performance for a period of one year from date of shipment from RIKEN KEIKI CO., LTD., Inc. Any parts found defective within that period will be repaired or replaced, at our option, free of charge. This warranty does not apply to those items which by their nature are subject to deterioration or consumption in normal service, and which must be cleaned, repaired, or replaced on a routine basis.

Warranty is voided by abuse including mechanical damage, alteration, rough handling, or repair procedures not in accordance with the operator’s manual. This warranty indicates the full extent of our liability, and we are not responsible for removal or replacement costs, local repair costs, transportation costs, or contingent expenses incurred without our prior approval.

THIS WARRANTY IS EXPRESSLY IN LIEU OF ANY AND ALL OTHER WARRANTIES AND REPRESENTATIONS, EXPRESSED OR IMPLIED, AND ALL OTHER OBLIGATIONS OR LIABILITIES ON THE PART OF RIKEN KEIKI CO., LTD., INCLUDING BUT NOT LIMITED TO, THE WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL RIKEN KEIKI CO., LTD., BE LIABLE FOR INDIRECT, INCIDENTAL, OR CONSEQUENTIAL LOSS OR DAMAGE OF ANY KIND CONNECTED WITH THE USE OF ITS PRODUCTS OR FAILURE OF ITS PRODUCTS TO FUNCTION OR OPERATE PROPERLY.

This warranty covers instruments and parts sold to users by authorized distributors, dealers, and representatives as appointed by RIKEN KEIKI CO., LTD.

We do not assume indemnification for any accident or damage caused by the operation of this gas monitor, and our warranty is limited to the replacement of parts or our complete goods.

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RKI Instruments GX-8000 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual