RKI Instruments GX-8000 User manual

Portable Gas Monitor
GX-8000
Operating Manual
Part Number: 71-0390
Revision: P2
Released: 3/16/16
Request for the Customers
Read and understand this operating manual before using this gas monitor.
Use it in accordance with this operating manual.
Regardless of warranty period, we shall not make any indemnification for accidents and
damage caused by using this gas monitor.
Make sure to read the warranty policy specified on the warranty.
Because this is a safety unit, a regular maintenance for every six months and daily
maintenance must be performed.
If any abnormality is found in the gas monitor, notify it to RKI immediately.
(Visit our Web site to find your nearest RKI office.)

Safety information
The Portable Gas Monitor Model GX-8000 is a gas monitor designed to provide continuous exposure
monitoring of combustible gas, oxygen (O2), toxic gas such as carbon monoxide (CO) and hydrogen sulfide
(H2S) 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
・Ambient temperature range for use ：-20°C to +50°C
・Ambient temperature range during battery charging ：0°C to +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=250V.
・Power supply of alkaline battery unit : BUD-8000
Powered by three series AA size alkaline batteries , model LR6 by TOSHIBA.
・Backup battery type CR1220 manufactured by Maxell.
Certificate numbers
・IECEx Certificate number ：IECEx KEM 10.0038
・ATEX Certificate number ：KEMA 10ATEX 0085
List of standards
・IEC 60079-0：2011 ・EN60079-0:2012
・IEC 60079-11：2011 ・EN60079-11:2012
・IEC 60079-26：2006 ・EN60079-26:2007
WARNING
・Do not charge in hazardous location.
・Do not charge it except 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
A B C D E
A: Manufacturing year (0-9)
B: Manufacturing month (1-9,XYZ for Oct.-Dec.)
C: Manufacturing lot
D: Serial number
E: Code of factory
・Ⅱ1 G Ex ia ⅡC T4 Ga

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<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
2 Important Notices on Safety................................................................................................3
2-1. Danger Cases...................................................................................................................3
2-2. Warning Cases..................................................................................................................4
2-3. Precautions.......................................................................................................................5
3 Product Components..........................................................................................................7
3-1. Main Unit and Standard Accessories.................................................................................7
3-2. Names and Functions for Each Part .................................................................................8
4 How to Use.........................................................................................................................11
4-1. Before Using the Gas Monitor...........................................................................................11
4-2. Preparation for Start-Up ....................................................................................................11
4-3. Basic Operating Procedures .............................................................................................16
4-4. How to Start the Gas Monitor............................................................................................17
4-5. How to Detect....................................................................................................................19
4-6. Modes ...............................................................................................................................23
4-7. Air Calibration Mode..........................................................................................................24
4-8. Display/Setting Mode........................................................................................................26
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. How to Clean.....................................................................................................................38
6-3. Parts Replacement............................................................................................................38
7 Calibration Mode…………………………………………………………………………………...41
7-1. Preparing for Calibration………..…………………………………………………….………….41
7-2. Fresh AirAdjustment (AIR CAL)…………………………………………………….…………...44
7-3. Span Adjustment……………………………………………………………………….………….46
7-4. High Concentration Combustible Gas ZeroAdjustment (VOL Z. CAL)……………………...48
8 Storage and Disposal..........................................................................................................49
8-1. Procedures to Store the Gas Monitor or Leave It for a Long Time ....................................49
8-2. Procedures to Use the Gas Monitor Again........................................................................49
8-3. Disposal of Products.........................................................................................................50
9 Troubleshooting..................................................................................................................51
10 Product Specifications ......................................................................................................53
10-1. List of Specifications........................................................................................................53
10-2. List of Accessories ..........................................................................................................55
11 Definition of Terms ............................................................................................................56

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1
Outline of the Product
1-1. Preface
Thank you for choosing our portable gas monitor GX-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 for
using 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 gas monitor is a multi gas type that enables simultaneous monitoring of all of the following five types of
gases at the maximum: oxygen, combustible gases, and toxic gases (carbon monoxide and hydrogen
sulfide) in the air and high-concentration combustible gases (vol%) in N2 and inert gases.
Detection results are not intended to guarantee life or safety in any way.
The gas monitor comes in several types for different combinations of gases to be detected. Check the
specifications of the gas monitor before use and conduct gas detection properly in accordance with
purposes. (See the list of gases to be detected at the end of this operating manual.)
In addition to this operating manual, an operating manual for the data logger management program (option)
is available for the gas monitor. Contact RKI if it is needed.
1-3. Definition of DANGER, WARNING, CAUTION, and
NOTE
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.

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2
Important Notices on
Safety
2-1. Danger Cases
DANGER
About explosion-proof
Do not modify or change the circuit or structure, etc.
When measuring the oxygen concentration, do not measure anything but a mixture of air and
combustible gases or vapors and toxic gases.
When using this gas monitor in a hazardous area, take the following countermeasures for
preventing 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 a
leakage resistance of 10 MΩ or less).
The battery units that can be connected are the BUL-8000(G) (certificate number TC19437) or
BUD-8000(G) (certificate number TC19438).
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
Combustible gas sensor circuit: Allowable voltage of 4.95 V, allowable current of 0.834 A, and
allowable power of 853 mW
Buzzer circuit: Allowable voltage of 4.95 V, allowable current of 0.431 A, and
allowable power of 441 mW
Main circuit: Allowable voltage of 4.95 V, allowable current of 0.717 A, and
allowable power of 733 mW
Backup circuit: 3.0 VDC, 10 μA
About use
While conducting measurement in a manhole or confined space, do not lean over or look into the
manhole or closed space. It may lead to dangers because oxygen-deficient air or other gases
may blow out.
Oxygen-deficient air or other gases may blow out from the gas exhausting outlet. Never inhale
the air or gases.
High-concentration (more than LEL) gases may blow out. Never use fire near the gas monitor.

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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 the
atmospheric pressure. The internal piping system may be damaged.
Handling of sensor
Do not disassemble the electrochemical type sensor or galvanic cell type sensor because they
contain 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 is
decomposed. 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 on
your judgment.
Battery level check
Before use, check that there remains sufficient battery power. When the gas monitor is used for
the first time or is not used for a long period, the batteries may be exhausted. Either fully
recharge 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 recharge the batteries in a non-hazardous area.
Others
Do 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.

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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 use the gas monitor where water or dirt gets accumulated. The gas monitor placed at
such a location 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 -20ºC or rises over 50ºC.
The operating temperature of the gas monitor is -20 to 50ºC. 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 gas sampling
hose.
Condensation formed inside the gas monitor or gas sampling hose causes clogging or gas
adsorption, which may disturb accurate gas detection. Thus, condensation must be avoided. In
addition to the operating environment, carefully monitor the temperature/humidity of the sampling
point to prevent condensation inside the gas monitor or gas sampling hose. 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 is
used, 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.

- 6 -
CAUTION
Others
Pressing buttons unnecessarily may change the settings, preventing alarms from activating
correctly. 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.
If using a version of the GX-8000 that has a Li-ion battery unit, do not use the gas monitor while
recharging it.
Whereas the gas monitor can detect oxygen, combustible gases, carbon monoxide, and
hydrogen sulfide, the operating environment may include gases that have harmful effects on the
sensors of this unit. (Different gases can be defected depending on the type.)
The gas monitor cannot be used in the presence of the following gases:
(1) Sulfides (such as H2S and SO2) continuously existing in high concentrations
(2) Halogen gases (such as chloride compounds and chlorofluorocarbons)
(3) Silicone (Si compounds)
Do not use the gas monitor in the presence of the above gases (such as high-concentration
sulfides, halogen gases, and silicone), which may shorten the sensor life significantly or cause
malfunctions such as inaccurate readings.
In case the gas monitor is used for detection in the presence of silicone, etc., be sure to check
the gas sensitivities before using it again.

- 7 -
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 RKI.
<Main Unit>
<Standard Accessories>
AC powered charger: 1
OR
AA alkaline battery: 3
Gas sampling probe and
gas sampling hose: 1
Shoulder strap: 1
Operating manual
Product warranty
GX-8000
main unit
Battery unit: Li-ion or dry
DANGER
About explosion-proof
Do not modify or change the circuit or structure, etc.
When measuring the oxygen concentration, do not measure anything but a mixture of air and
combustible gases or vapors and toxic gases.
When using this gas monitor in a hazardous area, take the following countermeasures for
preventing 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 a
leakage resistance of 10 MΩ or less).
The battery units that can be connected are the BUL-8000(G) (certificate number TC19437) or
BUD-8000(G) (certificate number TC19438).
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
Combustible gas sensor circuit: Allowable voltage of 4.95 V, allowable current of 0.834 A, and
allowable power of 853 mW
Buzzer circuit: Allowable voltage of 4.95 V, allowable current of 0.431 A, and
allowable power of 441 mW
Main circuit: Allowable voltage of 4.95 V, allowable current of 0.717 A, and
allowable power of 733 mW
Backup circuit: 3.0 VDC, 10 μA

- 8 -
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 in combinations.
BUL-8000 (certification number TC19437)=>
BUL-8000(G) for Li-ion battery unit
BUD-8000 (certification number TC19438)=>
BUD-8000(G) for dry battery unit
Additionally, a nameplate indicating a compatible
model is affixed on the top of the battery unit.
Check this information and use a correct
combination.
3-2. Names and Functions for Each Part
<Outline Drawing>
Printing for
identification

- 9 -
(1)
LCD display
Displays gas concentrations, alarms, etc.
(2)
Buzzer sound opening
Emits a buzzer sound at an alarm. (Do not block it.)
(3)
Alarm LED arrays
The lamp blinks in response to an alarm.
(4)
Infrared communication port
Used to carry out data communications with a PC in data logger
mode.
(5)
▲/AIR switch
Keep this switch pressed to perform fresh air adjustment.
(6)
▼/RESET switch
When an alarm occurs, press this switch to reset the alarm.
(7)
DISPLAY switch
Press this switch to change between display modes.
(8)
POWER/ENTER switch
Turns on and off the power.
(9)
Gas inlet
Connect a sampling hose to this port.
(10)
Gas outlet
Exhausts the gas drawn into the gas monitor. (Do not block it.)
(11)
Recharging jack cover
Remove this cover to connect an AC powered charger and recharge
the batteries.
(12)
Recharging indicator lamp
Lights up in red during recharging and goes off when recharging is
completed.
(13)
Sensor cover
There are sensors inside. May be opened only when the sensor is to
be replaced.
(14)
Activated carbon filter knob
Turn this knob to detach and replace the activated carbon filter. No
activated carbon filter is used on a type that does not measure carbon
monoxide. Keep this knob tightened at all times.
(15)
Battery unit screws
Turn these screws to detach and replace the battery unit.
CAUTION
Do not jab the buzzer opening with a sharp-pointed item. The unit may malfunction or get
damaged, 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.

- 10 -
<LCD Display>
(1)
Pilot indicator
Displays the operating status in the detection mode. Normal: Blinking
(2)
Combustible gas
concentration
digital and bar display
Displays the gas concentration as a numeric value and a level in the bar
graph.
(3)
Carbon monoxide
concentration
digital and bar display
Displays the gas concentration as a numeric value and a level in the bar
graph.
(4)
Battery level display
Displays the battery level. See the information below for the meanings of
battery level icons.
(5)
Pump driving indicator
Displays the suction status in the detection mode. Normal: Rotating
(6)
Oxygen concentration
digital and bar display
Displays the gas concentration as a numeric value and a level in the bar
graph.
(7)
Hydrogen sulfide
concentration
digital and bar display
Displays the gas concentration as a numeric value and a level in the bar
graph.
(8)
Clock display
Displays the current time.
NOTE
The meanings of battery level icons are as follows:
: Sufficient / : Low / : Needs recharging
If the battery level is lower than the above, the inside of the battery icon starts to blink ( ).
(2) Combustible gas
concentration digital
and bar display
(6) Oxygen
concentration digital
and bar display
(3) Carbon monoxide
concentration digital
and bar display
(7) Hydrogen sulfide
concentration digital
and bar display
(4) Battery level icon
(8) Clock display
(5) Pump driving
indicator
(1) Pilot indicator

- 11 -
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 gas sampling hose.
Check that the filter in the gas sampling probe is free of dust or clogging.
Check that the gas monitor, gas sampling probe, and gas sampling hose are connected properly.
<Recharging the Batteries in a Li-ion Battery Unit>
When the gas monitor is used for the first time, or when the battery level is low, be sure to use the
accessory AC powered charger to recharge the batteries.
CAUTION
Use the dedicated AC powered charger.
Recharge the batteries in a non-hazardous area.
Recharge the batteries at ambient temperatures between 0 to 40ºC.
Do not use the gas monitor while recharging it. Correct measurements cannot be obtained.
Furthermore, the batteries get deteriorated more quickly and may have a shorter life.
The AC powered charger is not water-proof or dust-proof. Do not recharge the batteries while the
gas monitor is wet.
The AC powered charger is not explosion-proof.

- 12 -
(1) Open the recharging jack cover of the gas monitor.
(2) Put the plug of the AC powered charger into the recharging jack of
the gas monitor.
(3) Connect the AC powered charger to the wall electric outlet.
When recharging is started, the recharging indicator lamp lights up
(red).
(Recharging time: Three hours)
(4) When recharging is completed, the recharging indicator lamp goes off.
(5) When recharging 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
recharging jack cover. Put the recharging jack cover as far as it will go.
NOTE
During recharging, the battery pack may get hot, but this is not abnormal.
The temperature of the gas monitor is high immediately after recharging is completed. Let it leave for
10 minutes or more before using it. Otherwise, correct measurements may not be obtained.
When fully recharged batteries are recharged again, the recharging indicator lamp does not go on.
CAUTION
Do not pull the recharging jack cover too hard.
It may get damaged.
CAUTION
Do not use the gas monitor with the recharging jack cover detached. Dust or water may get into
the gas monitor, causing it to malfunction. Replace the recharging jack cover if it is damaged.
If the recharging 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.

- 13 -
<Replacing the Batteries in a Dry Battery Unit>
When the gas monitor is used for the first time, or when the battery level is low, attach new AA alkaline
batteries.
(1) Using a flathead screwdriver or coin, turn the battery
cover fixing screw counterclockwise to open 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.
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 or
water may get in through the clearance. Water may also get in if a minute foreign substance is
caught beneath the battery unit.
<Batteries>
Use AA alkaline batteries.
Rechargeable batteries cannot be used.

- 14 -
CAUTION
Turn off the power of the gas monitor before
replacing the battery unit.
Detach and reattach the battery unit in a
non-hazardous area.
If the battery unit screw is not completely
tightened, the battery unit may drop off or
water may get in through the clearance.
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.
<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.
NOTE
Make sure that the battery unit is installed in
correct orientation by checking the locations of the
connection terminal and projection portions.
(4) Securely tighten the two battery unit screws.
Bottom view

- 15 -
<Connection of Gas Sampling Probe and Gas Sampling Hose>
Attach the gas sampling probe to the end of the gas sampling hose.
Connect the sampling hose 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.
CAUTION
Use only a gas sampling hose specified by RKI.
Use the gas monitor with the gas sampling probe connected so that no foreign substance is
drawn into it.
Connect a gas sampling probe and a gas sampling hose by fastening them manually without
using any tool. If they are fastened too tightly using a tool, the plastic part of the gas sampling
probe may be broken.
CAUTION
Connecting tubing to the GAS OUT fitting suppresses the gas reading. RKI recommends that no
tubing be attached to the GAS OUT fitting. If the application requires routing of the exhaust gas,
keep the tubing length as short as possible.

- 16 -
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
DISPLAY
AIR (long pressing)
<<Gas Alarm Status>>
(Self-latching <Reset after
Recovery to Normal Status>)
<<Display and Setting Mode>>
<<Fault Alarm Status>>
(Self-latching)
<<Air Calibration Mode>>

- 17 -
4-4. How to Start the Gas Monitor
<<Start-up Procedure>>
Keep the POWER switch pressed for three seconds or more.
↓
LCD
All LCDs light up.
Alarm lamp lights up.
Buzzer sounds once. (Beep)
↓
Date/Time Display
↓
Battery Voltage Display
↓
Gas Name Display
↓
Full Scale Display
↓
First Alarm Setpoint Display
↓
Second Alarm Setpoint Display

- 18 -
↓
STELAlarm Setpoint Display
↓
TWAAlarm Setpoint Display
↓
ID Display
↓
Detection Mode
Buzzer sounds twice. (Beep, beep)
NOTE
A sensor abnormality alarm is issued before the detection mode is entered if there is any abnormality
in the sensor. Press the RESET button. This will reset the sensor abnormality alarm temporarily, set
the gas concentration display that was abnormal on the sensor to ---, and start gas detection. However,
notify the abnormality to RKI promptly. Gas for which there was an abnormality in the sensor cannot be
detected. However, the alarm cannot be reset if there is an abnormality in all the sensors.
If there is an abnormality in the built-in clock, a fault alarm FAIL CLOCK may be issued. Press the
RESET button. The fault alarm is temporarily reset, and measurement is started with incorrect clock
time.
CAUTION
After start-up, perform air calibration (air calibration mode) before performing gas detection.