RKI Instruments RX-8500/RX-8700 Owner's manual

RKI Instruments RX-8500/RX-8700 Owner's manual
PT0E-1361
Portable Multi-Gas Monitor
RX-8500/RX-8700
Operating Manual
(PT0-136)
Contents
1 Outline of the Product...................................................................................................................................... 4
Preface ............................................................................................................................................................ 4
Purpose of use ................................................................................................................................................ 4
Definition of DANGER, WARNING, CAUTION and NOTE ............................................................................ 5
2. Important Notices on Safety ........................................................................................................................... 6
2-1. Danger cases........................................................................................................................................... 6
2-2. Warning cases ......................................................................................................................................... 8
2-3. Precautions .............................................................................................................................................. 9
2-4. Safety Information ................................................................................................................................. 11
3. Product Components .................................................................................................................................... 12
3-1. Main unit and standard accessories ...................................................................................................... 12
Main unit .................................................................................................................................................... 12
Accessories ............................................................................................................................................... 13
3-2. Names and functions for each part ....................................................................................................... 16
<RX-8500 (with lithium ion battery unit BUL-8000(Z1))> ......................................................................... 16
<RX-8700 (with lithium ion battery unit BUL-8000(Z1))> ......................................................................... 19
4. How to Use ................................................................................................................................................... 23
4-1. Before using the gas monitor ................................................................................................................ 23
4-2. Preparation for start-up ......................................................................................................................... 23
4-2-1. Charging the lithium ion battery unit (BUL-8000(Z1)) .................................................................... 24
4-2-2. Detaching and attaching the battery unit........................................................................................ 25
4-2-3. Attaching batteries to the dry battery unit (BUD-8000(Z), option) .................................................. 26
4-2-4. Connecting the gas sampling probe and gas sampling hoses ...................................................... 27
4-3. How to start the gas monitor ................................................................................................................. 29
4-3-1. Power-on ........................................................................................................................................ 29
4-3-2. Switching the hydrogen sulfide measuring mode range on RX-8700 ............................................ 31
4-4. Basic operating procedures................................................................................................................... 32
4-4-1. RX-8500 basic operating procedures ............................................................................................. 32
4-4-2. RX-8700 basic operating procedures ............................................................................................. 33
4-5. Measurement ......................................................................................................................................... 34
4-5-1. Gas concentration measurement ................................................................................................... 34
4-5-2. Range switching point .................................................................................................................... 36
4-6. Air calibration ......................................................................................................................................... 37
4-6-1. Attaching the CO2 removal filter (RX-8500) ................................................................................... 37
4-6-2. Air calibration procedure ................................................................................................................. 38
4-7. Manual memory ..................................................................................................................................... 41
4-8. Stopping the pump (PUMP OFF mode) ................................................................................................ 42
4-9. Power-off ............................................................................................................................................... 43
5. Setting Procedure ......................................................................................................................................... 44
5-1. Display/setting mode ............................................................................................................................. 44
5-2. PEAK display/clear ................................................................................................................................ 46
5-3. Full scale/alarm setpoint display/gas alarm test (optional function) ..................................................... 47
5-4. Station ID display................................................................................................................................... 48
5-5. Log data display .................................................................................................................................... 49
6. Fault Alarm Function .................................................................................................................................... 50
Fault alarm activation .................................................................................................................................... 50
7. Maintenance ................................................................................................................................................. 52
7-1. Maintenance intervals and items ........................................................................................................... 52
About maintenance services ..................................................................................................................... 53
7-2. Span adjustment .................................................................................................................................... 54
7-2-1. Preparation ..................................................................................................................................... 54
7-2-2. How to connect ............................................................................................................................... 54
7-2-3. Span adjustment procedure ........................................................................................................... 55
7-3. How to clean .......................................................................................................................................... 58
7-4. Parts replacement ................................................................................................................................. 59
7-4-1. Sensor replacement ....................................................................................................................... 59
7-4-2. Replacement procedure for gas sampling probe dust filter ........................................................... 59
7-4-3. Replacement procedure for filter tube dust filter ............................................................................ 60
7-4-4. Replacement procedure for filter tube absorbent cotton ................................................................ 60
7-4-5. Replacement of regular replacement parts .................................................................................... 61
-2-
8. Storage and Disposal ................................................................................................................................... 62
8-1. Procedures to store the gas monitor or leave it for a long time ......................................................... 62
8-2. Procedures to use the gas monitor again ............................................................................................. 62
8-3. Disposal of products .............................................................................................................................. 63
9. Troubleshooting ............................................................................................................................................ 64
9-1. Abnormalities on unit ............................................................................................................................. 64
9-2. Abnormalities of readings ...................................................................................................................... 66
10. Product Specifications ................................................................................................................................ 67
10-1. RX-8500 specifications ........................................................................................................................ 67
10-1-1. List of RX-8500 specifications ...................................................................................................... 67
10-1-2. RX-8500 standard accessories .................................................................................................... 68
10-2. RX-8700 specifications ........................................................................................................................ 69
10-2-1. List of RX-8700 specifications ...................................................................................................... 69
10-2-2. RX-8700 standard accessories .................................................................................................... 70
10-3. List of optional items ............................................................................................................................ 71
11. Appendix ..................................................................................................................................................... 72
11-1. Definition of terms ................................................................................................................................ 72
11-2. Calibration history/various trend/event history functions..................................................................... 72
11-3. Gas alarm (optional function) .............................................................................................................. 74
-3-
1 Outline of the Product
Preface
1
1
Outline of the Product
Preface
Thank you for choosing our portable multi-gas monitor RX-8500/RX-8700 (hereinafter referred to as
"gas monitor"). Please check that the model number of the product you purchased is included in the
specifications on this manual.
This manual describes how to use the monitor properly and its specifications. Not only the first-time
users but also the users who have already used the gas monitor must read and understand the
operating manual and use this product as described in this manual.
Note that the contents of this manual are subject to change without notice for product improvement.
Also, any copying or reproduction of this manual, in whole or in part, without permission is prohibited.
Regardless of warranty period, we shall not make any indemnification for accidents and damage
caused by using the gas monitor.
Make sure to read the warranty policy specified on the warranty.
Purpose of use
This product is a portable gas monitor capable of measuring multiple gases alone, which is required in
LNG carriers or oil tankers. Measurable gases and ranges are shown below.
<RX-8500>
Measuring gas
Combustible gas (CH4)
Oxygen (O2)
Carbon monoxide (CO)
Carbon dioxide (CO2)
Measuring range <Service range>
0 - 100.0% LEL/5 - 100.0 vol%
0 - 25.0% <25.1 - 40.0%>
0 - 1000 ppm
0 - 20.0 vol%
<RX-8700>
Measuring gas
Combustible gas (HC)*
Oxygen (O2)
Measuring range <Service range>
0 - 100.0% LEL/2 - 100.0 vol%
0 - 25.0% <25.5 - 40.0%>
Hydrogen
sulfide (H2S)
0 - 30.0 ppm <30.5 - 100.0 ppm>
0 - 1000 ppm
[Low concentration]
[High concentration]
* HC: Isobutane converted
RX-8500 is capable of measuring CH4 (methane) as combustible gas, whereas RX-8700 is capable
of measuring general combustible gases HC (isobutane converted).
-4-
1 Outline of the Product
Definition of DANGER, WARNING, CAUTION and NOTE
Note that measurement results of the gas monitor are not intended to guarantee life or safety in any
way.
Check the specifications before use and conduct gas measurement properly in accordance with
purposes.
In addition to this operating manual, an operating manual for the data logger management program
(option) is available for the gas monitor. Please contact RIKEN KEIKI if it is needed.
Definition of DANGER, WARNING, CAUTION and NOTE
Throughout this manual, the following indications are used to ensure safe and effective work.
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.
-5-
2. Important Notices on Safety
2-1. Danger cases
2
2.
Important Notices on
Safety
To maintain the performance and use the gas monitor safely, observe the following instructions of
DANGER, WARNING and CAUTION.
2-1. Danger cases
DANGER
About explosion-proof
 Do not modify or change the circuit, structure, etc.
 When using the 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).
 [RX-8500, RX-8700] When measuring the oxygen concentration, do not measure anything but
a mixture of air and combustible gases or vapors and toxic gases.
 [RX-8500, RX-8700] Connect either the dry battery unit BUD-8000(Z)(TC21187) or lithium ion
battery unit BUL-8000(Z1)(TC21188).
 [BUD-8000(Z), BUL-8000(Z1)] Connect either RX-8500 or RX-8700(TC21186) unit.
 [BUD-8000(Z), BUL-8000(Z1)] Replace the battery unit in a safe place.
 [BUL-8000(Z1)] Charge the battery unit using the dedicated AC adapter in a safe place.
 [BUL-8000(Z1)] Charge the battery unit at ambient temperatures between 0 to 40ºC.
 [BUD-8000(Z)] Replace the batteries in a safe place.
 [BUD-8000(Z)] The explosion-proof standard for the gas monitor requires the use of TOSHIBA
dry batteries. Use three AA alkaline batteries (LR6) produced by TOSHIBA CORPORATION to
use the gas monitor as an explosion-proof unit.
 The specifications of RX-8500 and RX-8700 are as follows:
Pump circuit
: Allowable voltage of 4.95 V, allowable current of 1.12 A and allowable
power of 1138 mW
Infrared detection 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
Ambient temperature
: -20 - +50ºC
-6-
2. Important Notices on Safety
2-1. Danger cases
DANGER
About explosion-proof
 The specifications of BUL-8000(Z1) are as follows:
Pump circuit
: Maximum voltage of 4.25 V, maximum current of 1.12 A and
maximum power of 901 mW
Infrared detection circuit : Maximum voltage of 4.25 V, maximum current of 0.768 A and
maximum power of 618 mW
Buzzer circuit
: Maximum voltage of 4.25 V, maximum current of 0.410 A and
maximum power of 330 mW
Main circuit
: Maximum voltage of 4.25 V, maximum current of 0.653 A and
maximum power of 526 mW
Battery charging contact : Allowable voltage of 250 VAC, 50/60 Hz
Ambient temperature
: -20 - +50ºC
 The specifications of BUD-8000(Z) are as follows:
Pump circuit
: Maximum voltage of 4.95 V, maximum current of 1.12 A and
maximum power of 1138 mW
Infrared detection circuit : Maximum voltage of 4.95 V, maximum current of 0.834 A and
maximum power of 853 mW
Buzzer circuit
: Maximum voltage of 4.95 V, maximum current of 0.431 A and
maximum power of 441 mW
Main circuit
: Maximum voltage of 4.95 V, maximum current of 0.717 A and
maximum power of 733 mW
Power supply
: 4.5 V 150 mA (LR6 produced by TOSHIBA, 3 pcs)
Ambient temperature
: -20 - +50ºC
 Make sure that the product model on the nameplate is correct.
Inappropriate combinations of models deviate from the range of explosion-proof certification.
 The nameplate shows the followings as well as the product model.
Product model : Main unit: RX-8500, 8700
Lithium ion battery unit: BUL-8000(Z1)
Dry battery unit: BUD-8000 (Z)
Explosion proof class : 【RX-8500,8700】Ex ia IIC T4X
【BUL-8000(Z1), BUD-8000(Z)】 Ex ia IIC T4
Ambient temperature : -20 to 50ºC
Charging terminal rating : 【BUL-8000(Z1)】Allowable voltage AC250V 50/60Hz
Warnings : 【BUL-8000(Z1), BUD-8000(Z)】
Inhibit to take off battery unit in non-hazardous area.
 Manufacturer : RIKEN KEIKI Co., Ltd.
 IP protection class: IP20
Name plate
Name plate
About use
 While conducting measurement in a manhole or confined space, do not lean over or look into
the manhole or confined space. It may lead to dangers because oxygen-deficient air or other
gases may blow out.
 Oxygen-deficient air or other gases may be discharged from the gas exhausting outlet (GAS
OUT). Never inhale the air or gases.
 High-concentration (100% LEL or higher) gases may be discharged. Never use fire near it.
-7-
2. Important Notices on Safety
2-2. Warning cases
2-2. Warning cases
WARNING
Sampling point pressure
 The concentration meter is designed to draw gases under the atmospheric pressure. If
excessive pressure is applied to the gas inlet (GAS IN) and outlet (GAS OUT) of the gas
monitor, measured gases may leak out from its inside and may cause dangerous conditions.
Be sure that excessive pressure is not applied to them 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 carbon monoxide, hydrogen sulfide or oxygen sensor inside the gas
monitor because it contains electrolyte. Electrolyte may cause severe skin burns if it contacts
skin, while it may cause blindness if its 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.
Air calibration in atmosphere
 When air calibration is performed in the atmosphere, check the atmosphere for freshness
before beginning it. If interference gases exist, air calibration cannot be performed properly,
thus causing erroneous measurement and leading to dangers when the gas leaks.
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. Replace them
with new ones before use.
 If a low battery voltage alarm is triggered, gas measurement cannot be conducted. If the alarm
is triggered during use, turn off the power and promptly replace the batteries in a safe 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 batteries while the power is on.
 Do not vibrate or give a shock to the gas monitor by, for example, relocating the gas monitor
with an optional water trap attached. The gas inlet (GAS IN) may be damaged.
-8-
2. Important Notices on Safety
2-3. Precautions
2-3. Precautions
CAUTION
Do not use the gas monitor in a place 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 is not water-pressure-resistant. Avoid using it in a place where a high water
pressure is applied to it (under a faucet, shower, rainfall, etc.) or submerging it under water for
a long time. Note that 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 (GAS IN) and outlet (GAS OUT) 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
measured.
 Do not place 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 sound opening,
gas inlet (GAS IN), 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 measurement. Thus, condensation must be
avoided. In addition to the installation environment, carefully monitor the temperature/humidity
of the sampling point to prevent condensation inside the gas monitor. Please observe the
operating restrictions.
Do not use a transceiver near the gas monitor.
 Radio wave from a transceiver or the like near the gas monitor may disturb the readings. If a
transceiver or other radio wave transmitting device is used, it must be used in a place away
from the gas monitor 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 measurement cannot be performed properly.
Check whether the flow rate is lost.
Never fail to perform a regular maintenance.
 The gas monitor is a safety unit. Never fail to perform regular maintenance. Continuing to use
the gas monitor without performing maintenance will compromise the sensitivity of the sensor,
thus resulting in inaccurate gas measurement.
-9-
2. Important Notices on Safety
2-3. Precautions
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 accuracy of the gas monitor may be
deteriorated.
 Do not use the gas monitor while charging it.
 Whereas the gas monitor can measure combustible gases, carbon monoxide, carbon dioxide,
hydrogen sulfide and oxygen, the measurement environment may include gases that have
harmful effects on the sensors of this unit.
 When measuring concentrations of oxygen in inert gases for a long time, the carbon dioxide
concentration in the air must be 15 vol% or less. When the gas monitor is used in the inert gas
with a carbon dioxide concentration higher than 15 vol%, perform measurement in as short
time as possible.
 Do not use the gas monitor in a place with high oxygen concentration for a long time. The
oxygen sensor life may be shortened.
 Do not jab the buzzer sound opening with a sharp-pointed item. The gas monitor may
malfunction or get damaged, allowing foreign matter, etc. to get inside.
 Do not remove the panel sheet on the LCD display. The dust-proof performance will be
deteriorated.
 Do not affix a label or the like on the infrared port. Infrared communications can no longer be
conducted.
Replacement of batteries
 Turn off the power of the gas monitor before replacing the batteries.
 Replace all of the three batteries with new ones at one time.
 The explosion-proof standard for the gas monitor requires the use of TOSHIBA dry batteries
(only when the dry battery unit is used). Use three AA alkaline batteries (LR6) produced by
TOSHIBA CORPORATION to use the gas monitor as an explosion-proof unit.
 Pay attention to the polarities of the batteries.
Usage
 In a low-temperature environment, the operating time is shortened due to the battery
performance property.
 At low temperatures, the responses of the LCD display may slow down.
 Perform air calibration under pressure and temperature/humidity conditions close to those in
the operating environment and in fresh air.
 Perform air calibration after the reading is stabilized.
 If there is a sudden temperature change of 15ºC or more between the storage and operational
locations, turn on the power of the gas monitor, let it stand for about 10 minutes in a similar
environment to the operational location, and perform air calibration in fresh air before using it.
 When cleaning the gas monitor, do not splash water over it or use organic solvents such as
alcohol and benzene on it. The surface of the gas monitor may be discolored or damaged.
 If the gas monitor is not used for a long time, turn on the power at least once every six months
and check that the pump draws in air (about three minutes). The gas monitor, when not
activated for a long time, may cease to work because of hardening of the grease in the pump
motor.
 If the gas monitor is not used for a long time, store it after removing the batteries. Battery leaks
may result in fire, injury, etc.
 When using the gas monitor after long-term storage, never fail to perform air calibration. For
information on readjustment including air calibration, please contact RIKEN KEIKI.
- 10 -
2. Important Notices on Safety
2-4. Safety Information
2-4. Safety Information
The Portable Gas Detector Model RX-8500/8700 is a gas monitors designed to provide continuous
exposure monitoring of combustible gas, Oxygen (O2), toxic gas such as carbon monoxide (CO),
Carbon Dioxide(CO2), and hydrogen sulfide (H2S) in hazardous environments. The gas sampling
is suctioned 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(Z1) and alkaline dry battery unit is called BUD-8000(Z).
The battery unit structured even the end user is possible to replace.
Specification for safety
・Ex ia IIC T4 Ga
・
II 1 G 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(Z1)
Two parallel connected Li-ion cells used in battery pack BP-8000 are from type Maxell
INR18650PB1 or SDI INR18650-15M or SONY US18650VT3.
Um=250V..
・Power supply of alkaline battery unit : BUD-8000(Z)
Powered by three series AA size alkaline batteries, model LR6 by TOSHIBA.
Certificate numbers
・IECEx Certificate number : IECEx PRE 15.0012
・ATEX Certificate number : Presafe 15 ATEX6173
List of standards
・IEC 60079-0:2011
・IEC 60079-11:2011
・IEC 60079-26:2006
・EN60079-0:2012
・EN60079-11:2012
・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 WITH CONNECTED ALKALINE AA BATTERY, TYPE LR6
MANUFACTURED BY TOSHIBA.
INST. No. 0 0 0 0 0 0 0 0 0 0 0
AB 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
Phone
Fax
E-mail
Web site
:
:
:
:
+81-3-3966-1113
+81-3-3558-9110 GIII
[email protected]
http://www.rikenkeiki.co.jp
- 11 -
3. Product Components
3-1. Main unit and standard accessories
3
3.
Product Components
3-1. Main unit and standard accessories
Unpack and check the main unit and accessories.
If any part is missing, contact RIKEN KEIKI.
Main unit
See "Names and functions for each part" (P. 16) for names and functions of each part of the gas monitor
and LCD display.
<RX-8500 main unit>
<RX-8700 main unit>
- 12 -
3. Product Components
3-1. Main unit and standard accessories
Accessories
Lithium ion battery
unit (BUL-8000(Z1))
: 1 pc
AC adapter for
charging
: 1 pc
Filter tube and
relay tube: 1 pc
Filter tube and
relay tube: 1 pc
Absorbing tube fixing
belt: 2 pcs
Shoulder strap
: 1 pc
CO2 removal filter
(CF-283): 1 pc
(RX-8500 only)
Zero filter fixing belt
: 1 pc (RX-8500 only)
Product warranty
Operating manual
- 13 -
3. Product Components
3-1. Main unit and standard accessories
DANGER
About explosion-proof
 Do not modify or change the circuit, structure, etc.
 When using the 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).
 [RX-8500, RX-8700] When measuring the oxygen concentration, do not measure anything but
a mixture of air and combustible gases or vapors and toxic gases.
 [RX-8500, RX-8700] Connect either the dry battery unit BUD-8000(Z)(TC21187) or lithium ion
battery unit BUL-8000(Z1)(TC21188).
 [BUD-8000(Z), BUL-8000(Z1)] Connect either RX-8500 or RX-8700(TC21186) unit.
 [BUD-8000(Z), BUL-8000(Z1)] Replace the battery unit in a safe place.
 [BUL-8000(Z1)] Charge the battery unit using the dedicated AC adapter in a safe place.
 [BUL-8000(Z1)] Charge the battery unit at ambient temperatures between 0 to 40ºC.
 [BUD-8000(Z)] Replace the batteries in a safe place.

 [BUD-8000(Z)] The explosion-proof standard for the gas monitor requires the use of TOSHIBA
dry batteries. Use three AA alkaline batteries (LR6) produced by TOSHIBA CORPORATION to
use the gas monitor as an explosion-proof unit.
 The specifications of RX-8500 and RX-8700 are as follows:
Pump circuit
: Allowable voltage of 4.95 V, allowable current of 1.12 A and allowable
power of 1138 mW
Infrared detection 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
Ambient temperature
: -20 - +50ºC
 The specifications of BUL-8000(Z1) are as follows:
Pump circuit
: Maximum voltage of 4.25 V, maximum current of 1.12 A and
maximum power of 901 mW
Infrared detection circuit : Maximum voltage of 4.25 V, maximum current of 0.768 A and
maximum power of 618 mW
Buzzer circuit
: Maximum voltage of 4.25 V, maximum current of 0.410 A and
maximum power of 330 mW
Main circuit
: Maximum voltage of 4.25 V, maximum current of 0.653 A and
maximum power of 526 mW
Battery charging contact : Allowable voltage of 250 VAC, 50/60 Hz
Ambient temperature
: -20 - +50ºC
 The specifications of BUD-8000(Z) are as follows:
Pump circuit
: Maximum voltage of 4.95 V, maximum current of 1.12 A and
maximum power of 1138 mW
Infrared detection circuit : Maximum voltage of 4.95 V, maximum current of 0.834 A and
maximum power of 853 mW
Buzzer circuit
: Maximum voltage of 4.95 V, maximum current of 0.431 A and
maximum power of 441 mW
Main circuit
: Maximum voltage of 4.95 V, maximum current of 0.717 A and
maximum power of 733 mW
Power supply
: 4.5 V 150 mA (LR6 produced by TOSHIBA, 3 pcs)
Ambient temperature
: -20 - +50ºC
- 14 -
3. Product Components
3-1. Main unit and standard accessories
DANGER
 Make sure that the product model on the nameplate is correct.
Inappropriate combinations of models deviate from the range of explosion-proof certification.
 The nameplate shows the followings as well as the product model.
Product model : Main unit: RX-8500, 8700
Lithium ion battery unit: BUL-8000(Z1)
Dry battery unit: BUD-8000 (Z)
Explosion proof class : 【RX-8500,8700】Ex ia IIC T4X
【BUL-8000(Z1), BUD-8000(Z)】 Ex ia IIC T4
Ambient temperature : -20 to 50ºC
Charging terminal rating : 【BUL-8000(Z1)】Allowable voltage AC250V 50/60Hz
Warnings : 【BUL-8000(Z1), BUD-8000(Z)】
Inhibit to take off battery unit in non-hazardous area.
 Manufacturer : RIKEN KEIKI Co., Ltd.
 IP protection class: IP20
NOTE
Connect either the dry battery unit BUD-8000(Z) or
lithium ion battery unit BUL-8000(Z1).
Check the model of the battery unit with the nameplate
affixed to the unit.
A nameplate indicating a compatible model is affixed to the
battery unit to avoid using the gas monitor in combination
with a wrong unit.
Check this information and use a correct combination.
(Top view of battery unit)
Nameplate
(Side view of battery unit)
- 15 -
3. Product Components
3-2. Names and functions for each part
3-2. Names and functions for each part
This section describes names and functions of main unit and battery unit parts and LCD display.
<RX-8500 (with lithium ion battery unit BUL-8000(Z1))>
<Main Unit>
Name
Main function
(1)
LCD display
Displays a gas concentration, alarm, etc.
(2)
Buzzer sound opening
Emits a buzzer sound at an alarm. (Do not block it.)
(3)
Alarm LED arrays (top)
(4)
Alarm LED arrays (left)
(5)
Alarm LED arrays
(right)
(6)
Infrared
communication port
The red lamp blinks in response to an alarm.
Used to carry out data communications with a PC when the data
logger management program is used.
- 16 -
3. Product Components
3-2. Names and functions for each part
Name
Main function
▲/AIR button
Used to perform air calibration on the measurement screen. Or
used to increase a numeric value in the display/setting mode.
(8)
▼/PUMP button
Used to turn ON/OFF the pump on the measurement screen. Or
used to reset an alarm in an alarm state.
In the display/setting mode, press this button to decrease a numeric
value.
(9)
PEAK/ESC button
Used to switch the mode or display.
(10)
POWER/ENTER button
Used to turn ON/OFF the power.
(11)
Gas outlet (GAS OUT)
Exhausts the gas drawn into the gas monitor. (Do not block it.)
(12)
Gas inlet (GAS IN)
Draws a gas into the gas monitor. Connects the accessory tube, etc.
(13)
Charging indicator
lamp
Lights up in red during charging and goes off when charging is
completed.
(14)
Charging jack cover
Removed to connect an AC adapter and charge the batteries.
(15)
Buzzer sound opening
Emits a buzzer sound at an alarm. (Do not block it.)
(16)
Battery unit screws
Turn these screws to detach and replace the battery unit.
(7)
CAUTION
 Do not jab the buzzer opening with a sharp-pointed item. The unit may malfunction or get
damaged, allowing water or foreign matter, etc. to get inside.
 Do not remove the panel sheet on the surface. The water-proof and dust-proof performances
will be deteriorated.
 Do not affix a label or the like on the infrared port. Infrared communications can no longer be
conducted.
- 17 -
3. Product Components
3-2. Names and functions for each part
<Display>
Item
Main function
(1)
Operating status
display
Displays the operating status in the measuring mode.
A heart symbol blinks in the normal state.
(2)
Combustible gas
concentration display
Digital and bar display
Displays the gas concentration as a numeric value and a level in the
bar graph.
(3)
Carbon monoxide
concentration display
Digital and bar display
Displays the gas concentration as a numeric value and a level in the
bar graph.
(4)
Battery level icon
Displays the battery level. See NOTE for a guide for battery level.
(5)
Pump driving indicator
Displays the drawing status in the measuring mode. Rotates at a
normal state.
(6)
Oxygen concentration
display
Digital and bar display
Displays the gas concentration as a numeric value and a level in the
bar graph.
(7)
Carbon dioxide
concentration display
Digital and bar display
Displays the gas concentration as a numeric value
and a level in the bar graph.
NOTE
 The meanings of battery level icons are as follows:
: Sufficient/
: Low/
: Needs charging
If the battery level further drops, the inside of the battery icon starts to blink (
 The gas alarm function is an optional setting.
 When "NO ALARM" lights up, no gas alarm pattern is performed.
NO ALARM display
- 18 -
).
3. Product Components
3-2. Names and functions for each part
<RX-8700 (with lithium ion battery unit BUL-8000(Z1))>
<Main Unit>
Name
Main function
(1)
LCD display
Displays a gas concentration, alarm, etc.
(2)
Buzzer sound opening
Emits a buzzer sound at an alarm. (Do not block it.)
(3)
Alarm LED arrays
The red lamp blinks in response to an alarm.
(4)
HC/O2/H2S [low
concentration]
measuring mode
indicator lamp
Lights up (in green) when HC/O2/H2S [low concentration]
measuring mode is entered.
(5)
H2S [high
concentration]
measuring mode
indicator lamp
Lights up (in green) when H2S [high concentration] measuring
mode is entered.
(6)
Infrared
communication port
Used to carry out data communications with a PC when the data
logger management program is used.
(7)
▲/AIR button
Used to perform air calibration on the measurement screen. Or
used to increase a numeric value in the display/setting mode.
- 19 -
3. Product Components
Name
(8)
▼/PUMP button
3-2. Names and functions for each part
Main function
Used to turn ON/OFF the pump on the measurement screen. Or
used to reset an alarm in an alarm state.
In the display/setting mode, press this button to decrease a numeric
value.
(9)
PEAK/L/H/ESC button
Used to switch the mode between the H2S [high concentration]
measuring mode and HC/O2/H2S [low concentration] measuring
mode on the measurement screen.
Or used to switch the mode or display in the display/setting mode.
(10)
POWER/ENTER button
Used to turn ON/OFF the power.
(11)
Gas outlet (GAS OUT)
Exhausts the gas drawn into the gas monitor. (Do not block it.)
(12)
Gas inlet (GAS IN)
Draws a gas into the gas monitor. Connects the accessory tube, etc.
(13)
Charging indicator
lamp
Lights up in red during charging and goes off when charging is
completed.
(14)
Charging jack cover
Removed to connect an AC adapter and charge the batteries.
(15)
Buzzer sound opening
Emits a buzzer sound at an alarm. (Do not block it.)
(16)
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 matter, etc. to get inside.
 Do not remove the panel sheet on the surface. The water-proof and dust-proof performances
will be deteriorated.
 Do not affix a label or the like on the infrared port. Infrared communications can no longer be
conducted.
- 20 -
3. Product Components
3-2. Names and functions for each part
<Display (HC/O2/H2S [low concentration] measuring mode)>
Item
Main function
(1)
Operating status
display
Displays the operating status in the measuring mode.
A heart symbol blinks in the normal state.
(2)
Combustible gas
concentration display
Digital and bar display
Displays the gas concentration as a numeric value and a level in the
bar graph.
(HC concentration is displayed after isobutane conversion.)
(3)
Hydrogen sulfide
[low concentration]
concentration display
Digital and bar display
Displays the gas concentration as a numeric value and a level in the
bar graph.
(4)
Battery level icon
Displays the battery level. See NOTE for a guide for battery level.
(5)
Pump driving indicator
Displays the drawing status in the measuring mode. Rotates at a
normal state.
(6)
Oxygen concentration
display
Digital and bar display
Displays the gas concentration as a numeric value and a level in the
bar graph.
- 21 -
3. Product Components
3-2. Names and functions for each part
<Display (H2S [high concentration] measuring mode)>
Item
Main function
(1)
Operating status
display
Displays the operating status in the measuring mode.
A heart symbol blinks in the normal state.
(2)
Battery level icon
Displays the battery level. See NOTE for a guide for battery level.
(3)
Pump driving indicator
Displays the drawing status in the measuring mode. Rotates at a
normal state.
(4)
Hydrogen sulfide [high
Displays the gas concentration as a numeric value and a level in the
concentration]
bar graph.
concentration display
Digital and bar display
NOTE
 The meanings of battery level icons are as follows:
: Sufficient/
: Low/
: Needs charging
If the battery level further drops, the inside of the battery icon starts to blink (
 The gas alarm function is an optional setting.
 When "NO ALARM" lights up, no gas alarm pattern is performed.
NO ALARM display
- 22 -
).
4. How to Use
4-1. Before using the gas monitor
4
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 gas monitor must follow the
operating precautions.
Ignoring the precautions may damage the unit, resulting in inaccurate gas measurement.
4-2. Preparation for start-up
Before starting gas measurement, check the followings.
•
•
•
•
Check that the battery level is sufficient.
Check that the filter inside the gas monitor is not contaminated or clogged.
Check that there is no bend or hole in the gas sampling hose and relay tube.
Check that the main unit, relay tube, filter tube, gas sampling hose and gas sampling probe are
connected properly in this order.
DANGER
 Perform charging of the lithium ion battery unit or replacement of the battery unit/dry batteries
in a safe place.
- 23 -
4. How to Use
4-2. Preparation for start-up
4-2-1. Charging the lithium ion battery unit (BUL-8000(Z1))
When the gas monitor is used for the first time, or when the battery level is low, be sure to use the
dedicated AC adapter to charge the battery unit.
1
Open the charging jack
cover of the lithium ion
battery unit.
2
Insert the AC adapter plug
into the charging jack.
Charging indicator lamp
Insert the plug of AC
adapter for charging to
the charging jack.
Charging jack
Plug
AC adapter for charging
3
Insert the AC adapter to the
outlet.
When charging is started, the
charging indicator lamp lights up in
red.
(Charging time: Three hours at the
maximum until the battery unit is fully
charged)
When charging is completed, the
charging indicator lamp goes off.
4
When charging is
completed, disconnect the
AC adapter from the outlet.
5
Disconnect the AC adapter
plug from the charging jack
and attach the charging
jack cover.
Push the charging jack cover as far
as it will go.
DANGER
 Charge the battery unit using the dedicated AC adapter in a safe place.
 Charge the battery unit at ambient temperatures between 0 to 40ºC.
 Do not use the gas monitor while charging it. Correct measurements cannot be obtained.
Furthermore, the batteries get deteriorated more quickly and may have shorter life.
 The charger is neither water-proof nor dust-proof. Do not charge the batteries while the gas
monitor is wet.
 The charger is not explosion-proof.
- 24 -
4. How to Use
4-2. Preparation for start-up
CAUTION
 Do not pull the charging jack cover hard to open the cover in the step 1. It may get damaged.
 Do not use the battery unit with the charging jack cover detached. Dust or water may get into
the gas monitor, causing it to malfunction. If the charging jack cover is damaged, replace the
battery unit with new one.
 If the charging jack cover is not completely closed, water may get in from the charging jack.
The same thing may occur if a minute foreign substance gets stuck between the cover and the
unit.
 Disconnect the AC adapter from the outlet while it is not in use.
NOTE
 During charging, the lithium ion battery unit may get hot, but this is not an abnormality.
 The temperature of the unit is high immediately after charging is completed. Let it stand for 10
minutes or more before using it. Using the lithium ion battery unit while it is still hot may cause
erroneous measurement.
 When a fully charged battery unit is recharged, the charging indicator lamp does not light up.
4-2-2. Detaching and attaching the battery unit
1
Loosen the two battery unit
screws on the bottom.
<Lithium ion battery>
Battery unit screws
<Dry battery unit (option)>
Battery unit screws
2
Detach the battery unit.
- 25 -
4. How to Use
3
4-2. Preparation for start-up
Attach a new battery unit
and then tighten the two
battery unit screws.
Attach the battery unit in the correct
direction with attention to the
connection terminal or projections.
Connection
terminal
CAUTION
 Turn off the power of the gas monitor before replacing the battery unit.
 Replace the battery unit in a safe place.
 If the battery unit screws are not tightened securely, 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
between the battery unit and gas monitor.
 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.
4-2-3. Attaching batteries to the dry battery unit (BUD-8000(Z),
option)
When the gas monitor is used for the first time, or when the battery level is low, attach new AA alkaline
batteries.
1
Open the battery cover
located at the bottom of the
dry battery unit using a
flathead screwdriver or
coin.
Battery cover
Battery cover fixing screw
2
Attach three new dry
batteries observing the
correct polarity.
Indication
of battery
polarity
Remove old batteries as needed.
- 26 -
Batteries
4. How to Use
3
4-2. Preparation for start-up
Close the battery cover and
tighten the battery cover
fixing screw.
DANGER
 The explosion-proof standard for the gas monitor requires the use of TOSHIBA dry batteries.
Use three AA alkaline batteries (LR6) produced by TOSHIBA CORPORATION to use the gas
monitor as an explosion-proof unit.
CAUTION
Replacement of batteries
 Turn off the power of the gas monitor before replacing the dry batteries.
 Replace the dry batteries in a safe place.
 Pay attention to the polarities of the dry batteries.
 If the battery cover fixing screw is not tightened securely, 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 between the cover and the unit.
Batteries
 Replace all of the three batteries with new ones.
 Rechargeable batteries cannot be used.
4-2-4. Connecting the gas sampling probe and gas sampling
hoses
Attach the gas sampling hose to the gas sampling probe.
Connect the relay tube, filter tube, gas sampling hose and gas sampling probe in this order securely to the
gas inlet (GAS IN) of the main unit.
- 27 -
4. How to Use
4-2. Preparation for start-up
CAUTION
 Use only a gas sampling hose specified by RIKEN KEIKI.
 The gas sampling hose must be connected to the gas sampling probe before use so that no
foreign substance is drawn into it.
 Be sure to connect the gas sampling probe and gas sampling hose by fastening them by hand.
Fastening them too tight using a tool may break the plastic part of the gas sampling probe.
NOTE
 When connecting a part to the gas inlet (GAS IN), push the part until it clicks into place.
- 28 -
4. How to Use
4-3. How to start the gas monitor
4-3. How to start the gas monitor
When the power is turned on, self-diagnosis starts and then the measurement screen appears.
4-3-1. Power-on
Hold down the POWER/ENTER button (over three seconds) until the buzzer blips to turn on the power.
When the power is turned on, the LCD display changes automatically as shown below before the
measurement screen is displayed.
1
Hold down the
POWER/ENTER button
for at least 3 seconds.
Hold down the
button until the
entire LCD
display and
alarm lamp light
up and the
buzzer blips.
RX-8500 LCD display
RX-8700 LCD display
▼
▼
▼
▼
▼
▼
▼
▼
All LCDs light
up
Date/time
display
Battery voltage
display
Pump warm-up
- 29 -
4. How to Use
4-3. How to start the gas monitor
Gas name
display
▼
▼
▼
▼
▼
▼
▲
▼
▲
▼
▼
▼
Full scale
display
ID display
The screens on
the right are
displayed
alternately until
the ENTER
button is
pressed.
2
Filter
connection
check
Press the ENTER button.
The sensor warm-up operation is
performed for about 25 seconds.
The buzzer blips twice and then
the measurement screen is
displayed.
- 30 -
4. How to Use
4-3. How to start the gas monitor
CAUTION
 After start-up, perform air calibration (P. 37) before performing gas measurement.
 RX-8700 is started in the H2S [high concentration] measuring mode.
NOTE
 If any abnormality is detected in the sensor, a sensor abnormality
alarm is triggered just before entering the measuring mode.
Press the ▼ button when a sensor abnormality alarm is triggered.
The sensor abnormality alarm is reset temporarily, and "- - -"
appears in the concentration display area of the gas with sensor
abnormality before starting measurement (the alarm cannot be
reset if all sensors have an abnormality).
In this case, promptly contact RIKEN KEIKI. Gas measurement
cannot be performed with a sensor having an abnormality.
 If there is an abnormality in the built-in clock, a fault alarm "FAIL
CLOCK" may be triggered. Press the ▼ button when the alarm is
triggered. The fault alarm is temporarily reset, and measurement is
started with incorrect clock time.
Display example
(Oxygen sensor abnormality)
4-3-2. Switching the hydrogen sulfide measuring mode range
on RX-8700
RX-8700 switches the mode between the H2S [high concentration] measuring mode and HC/O2/H2S [low
concentration] measuring mode.
Hold down the L/H
button (about one
second) and release it
when the buzzer blips
once.
H2S [high concentration]
measuring mode
- 31 -
HC/O2/H2S
[low concentration]
measuring mode
4. How to Use
4-4. Basic operating procedures
4-4. Basic operating procedures
This mode is used on the measurement screen after power-on.
4-4-1. RX-8500 basic operating procedures
<Measurement screen>
Long pressing
<Fault alarm state (self-latching)>
(Low flow rate)
<Air calibration mode>
Pressing
at the
same
time
Pressing at
the same time
<Manual memory mode>
<Calibration mode>
Long pressing
Short pressing
<Pump ON/OFF mode>
<Display/setting mode>
- 32 -
4. How to Use
4-4. Basic operating procedures
4-4-2. RX-8700 basic operating procedures
Long
pressing
(about
1 second)
HC/O2/H2S <low concentration>
measuring mode
H2S <high concentration>
measuring mode
<Measurement screen>
(HC/O2/H2S <low concentration>
measuring mode)
Long pressing
<Fault alarm state (self-latching)>
(Low flow rate)
<Air calibration mode>
Pressing
at the
same
time
Pressing at
the same time
<Calibration mode>
<Manual memory mode>
Long pressing
<Pump ON/OFF mode>
Long
pressing
(about
3 seconds)
<Display/setting mode>
- 33 -
4. How to Use
4-5. Measurement
4-5. Measurement
Measure gas concentration on the measurement screen. Put the gas sampling probe close to the
measurement area.
Once gas concentration measurement is started, the gas monitor draws in a measuring gas for a certain
period of time and then displays a concentration value as a measurement result.
4-5-1. Gas concentration measurement
With the measurement screen displayed, put the gas sampling probe close to the measurement area and
take the reading on the LCD display.
<RX-8500>
Combustible gas
concentration
(CH4: Methane)
: 0.0% LEL, 0 vol%
Carbon monoxide
concentration
: 0 ppm
Oxygen concentration
: 20.9%
Carbon dioxide
concentration
: 0.00 vol%
Battery level
: Sufficient
<RX-8700>
H2S [high
concentration]
measuring mode
Hydrogen sulfide
concentration
: 0 ppm
HC/O2/H2S [low
concentration]
measuring mode
Combustible gas
concentration
(HC: Isobutane
converted)
: 0.0% LEL, 0 vol%
Oxygen concentration
: 20.9%
Hydrogen sulfide
concentration
: 0.0 ppm
Battery level
: Sufficient
- 34 -
4. How to Use
4-5. Measurement
WARNING
 The gas monitor is designed to draw gases around it under the atmospheric pressure. If
excessive pressure is applied to the gas inlet (GAS IN) and outlet (GAS OUT) of the gas
monitor, measured gases may leak out from its inside and may cause dangerous conditions.
Be sure that excessive pressure is not applied to them while used.
 Do not connect the sampling hose directly to a measurement area with a pressure higher than
the atmospheric pressure. The internal piping system may be damaged.
 When air calibration is performed in the atmosphere, check the atmosphere for freshness
before beginning it. If interference gases exist, the calibration cannot be performed properly,
thus leading to dangers when the gas leaks.
 Issuance of a gas alarm indicates that there are extreme dangers. Take proper actions based
on your judgment.
 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
charge the batteries or replace them with new ones before use.
 Gas measurement cannot be performed with a low battery voltage. If the low battery voltage
alarm is triggered during use, turn off the power and promptly charge or replace the batteries in
a safe place.
 Do not block the buzzer sound opening. No alarm sound can be heard.
CAUTION
 Before performing gas measurement, connect the gas sampling probe provided with the gas
monitor to prevent disturbances by air dust.
 When measuring concentrations of oxygen in inert gases for a long time, the carbon dioxide
concentration in the air must be 15% or less. When the gas monitor is used in the inert gas with
a carbon dioxide concentration higher than 15%, perform measurement in as short time as
possible.
 Do not use the gas monitor in a place with high oxygen concentration for a long time. The
oxygen sensor life may be shortened.
NOTE
 In a low-temperature environment, the operating time is shortened due to the battery performance
property.
 At low temperatures, the responses of the LCD display may slow down.
 If a combustible gas with 100% LEL or higher concentration is drawn, adsorbed gases may remain in
the gas sampling hose or gas sampling probe. After drawing a high-concentration combustible gas,
be sure to draw fresh air and perform air cleaning until the reading nears zero to remove adsorbed
gases. Performing air calibration before cleaning completely may result in inaccurate air calibration,
giving adverse influence on measurement. In such a case, remove the gas sampling probe and hose
and then perform air calibration to avoid inaccurate calibration.
 [RX-8700] To measure an area where high-concentration hydrogen sulfide may be present, use the
H2S [high concentration] measuring mode.
 [RX-8700] To measure hydrogen sulfide concentration, check that hydrogen sulfide concentration is
less than 100 ppm in the H2S [high concentration] measuring mode and then measure combustible
gas and oxygen concentrations in the HC/O2/H2S [low concentration] measuring mode. Drawing
high-concentration hydrogen sulfide in the HC/O2/H2S [low concentration] measuring mode may
damage the combustible gas, oxygen or low-concentration hydrogen sulfide sensor.
- 35 -
4. How to Use
4-5. Measurement
4-5-2. Range switching point
The display automatically switches to the vol% range when the concentration of a measured combustible
gas exceeds 100% LEL. When the concentration drops, the display returns to the %LEL range again. The
following shows an example of switching timing.
<Example of gas concentrations and range switching timing>
(1) RX-8500
CH4 concentration
100%LEL
(5.0vol%)
%LEL range
vol% range
Switching point
%LEL range
Switching point
Combustible gas concentration display
•
CH4: Methane
•
The range switching point is a lower explosive limit of a gas. It is 5.0 vol% for methane.
(2) RX-8700
HC concentration
100%LEL
(1.8vol%)
%LEL range
vol% range
Switching point
%LEL range
Switching point
Combustible gas concentration display
•
HC: Isobutane converted
•
The range switching point is a lower explosive limit of a gas. It is 1.8 vol% for isobutane.
- 36 -
4. How to Use
4-6. Air calibration
4-6. Air calibration
Air calibration is zero adjustment to correctly measure the current gas concentration.
4-6-1. Attaching the CO2 removal filter (RX-8500)
To perform zero calibration for carbon dioxide (CO2), CO2 in the air needs to be removed using the CO2
removal filter.
Attach the CO2 removal filter so that the arrow (->) on the side is directed at the filter tube.
Filter tube side
Direct the arrow at the filter tube.
Stand the CO2 removal filter to use. With it laid horizontally, CO2 in the air may not be absorbed.
Correct use
Incorrect use
With the CO2 removal filter laid horizontally, air
passes through the shaded area and CO2
cannot be absorbed.
CO2 removal filter
Stand the CO2
removal filter to use.
Filter tube
CO2 removal filter
Filter tube
The number of usable times per filter depends on the carbon dioxide concentration in the air. It varies also
by the air tightness of CO2 removal filter, storage temperature or humidity.
The following table shows guide values assuming that each use takes one minute for drawing. However,
use the removal filter with a margin when the carbon dioxide concentration in the environment is unknown.
Measurement
environment
carbon dioxide (CO2)
concentration
500ppm
1000ppm
2000ppm
4000ppm
Estimated number of usable times
in consideration of storage
condition
Approx. 1000 times
Approx. 500 times
Approx. 200 times
Approx. 100 times
- 37 -
4. How to Use
4-6. Air calibration
CAUTION
 Do not draw high-concentration carbon dioxide during zero calibration.
 Do not breathe on the inlet during zero calibration.
 Block ventilation to the air after using the CO2 removal filter. With the air mixed, the absorbent
absorbs carbon dioxide in the air, resulting in degraded absorption performance.
 Store the CO2 removal filter in a dry place away from direct sunlight.
NOTE
 The number of usable times per filter depends on the carbon dioxide concentration in the air. It varies
also by the air tightness of CO2 removal filter, storage temperature or humidity.
 The above table shows guide values assuming that each use takes one minute for drawing. However,
use the removal filter with a margin when the carbon dioxide concentration in the environment is
unknown.
4-6-2. Air calibration procedure
1
RX-8500 LCD display
RX-8700 LCD display
▼
▼
▼
▼
Hold down the AIR button
on the measurement
screen.
The air calibration screen is
displayed.
Keep the AIR button pressed while
the screen shown in the right figure
is displayed.
Air calibration is not started if the
button is released before the screen
is displayed.
Press the ESC button to stop air
calibration.
- 38 -
4. How to Use
2
4-6. Air calibration
Release the AIR button
when the screen shown in
the right figure is
displayed.
On RX-8500, nitrogen gas
calibration is performed next.
Pressing the ESC button skips
nitrogen gas calibration and
performs air calibration.
On RX-8700, nitrogen gas
calibration is not performed.
3
For RX-8500, attach the
CO2 removal filter and
press the ENTER button.
See "4-6-1. Attaching the CO2
removal filter" for how to attach the
CO2 removal filter.
▼
▼
▼
▼
▼
▼
▼
▼
When air calibration is completed,
the screen shown in the right figure
is displayed.
WARNING
 When air calibration is performed in the atmosphere, check the atmosphere for freshness
before beginning it. If interference gases exist, air calibration cannot be performed, thus
leading to dangers when the gas leaks.
 Perform air calibration under pressure and temperature/humidity conditions close to those in
the operating environment and in fresh air.
 Perform air calibration after the reading is stabilized.
 If there is a sudden temperature change of 15ºC or more between the storage and operational
locations, turn on the power of the gas monitor, let it stand for about 10 minutes in a similar
environment to the operational location, and perform air calibration in fresh air before using it.
 [RX-8500] The amount of carbon dioxide in the air is about 300 to 500 ppm. If air calibration for
the carbon dioxide sensor is performed while directly drawing air where carbon dioxide is
present, correct measurement of gas concentration becomes impossible. Before performing air
calibration on RX-8500, attach the CO2 removal filter and draw air for at least one minute.
- 39 -
4. How to Use
4-6. Air calibration
NOTE
 If air calibration fails, "FAIL - AIR CAL" is displayed along with the
name of gas sensor which has become faulty. Press the ▼ button
to reset the fault alarm (calibration failure). When the alarm is reset,
the value before calibration is displayed.
 [RX-8500] Do not draw high-concentration carbon dioxide during air
calibration.
 [RX-8500] Do not breathe on the inlet (GAS IN) during air
Air calibration failure display example
calibration.
Oxygen (O2) sensor
 [RX-8500] Block ventilation to the air after using the carbon dioxide
removal filter. With the air mixed, the absorbent absorbs carbon dioxide in the air, resulting in
degraded absorption performance.
 [RX-8700] Perform air calibration in each of the two modes (H2S [high concentration] measuring
mode and HC/O2/H2S [low concentration] measuring mode).
- 40 -
4. How to Use
4-7. Manual memory
4-7. Manual memory
Up tO256 arbitrary instantaneous values during measurement can be recorded.
When the number of recorded data points reaches the maximum, recorded data will be overwritten, starting
from the oldest data.
1
Hold down the ▲ and PEAK buttons on the
measurement screen.
The memory number, recorded date and recorded concentration
are displayed in turn as shown below.
Display example (RX-8500)
Memory No.
Recorded date
Recorded concentration
Press the ESC button to skip recording the displayed contents. The
measurement screen returns.
2
Press the ENTER button.
"END" is displayed on the screen, and the memory number, date
and gas concentration at the time the ENTER button is pressed are
recorded.
After recording the data, the measurement screen returns
automatically.
NOTE
 If PEAK and ▲ buttons are not pressed at the same time, the air calibration (P. 37) or display/setting
(P. 44) screen is displayed. In this case, release both buttons and try again after displaying the
measurement screen.
- 41 -
4. How to Use
4-8. Stopping the pump (PUMP OFF mode)
4-8. Stopping the pump (PUMP OFF mode)
The pump operation can be stopped.
1
Hold down the PUMP button on the measurement
screen (about five seconds).
The pump stops operating.
The buzzer blips twice every three minutes or so while the pump
operation is stopped.
2
Press the PUMP button to activate the pump.
The measurement screen returns.
WARNING
 No alarm is triggered under any circumstances in the PUMP OFF state.
 The measuring mode does not return automatically in the PUMP OFF state.
- 42 -
4. How to Use
4-9. Power-off
4-9. Power-off
CAUTION
 If the concentration display is not reset to zero (or 20.9% for the oxygen concentration display)
after measurement is completed, leave the gas monitor in fresh air until the display returns to
zero and then turn off the power.
Keep the POWER/ENTER button pressed.
To turn off the power, hold down the POWER/ENTER button
after the display returns to zero (0, or 20.9% for oxygen) in a
safe place.
The buzzer blips three times and "TURN OFF" appears on
the display before the power is turned off.
Power-off
NOTE
 To turn off the power, keep the button pressed until the display disappears.
 If the display is not zero when the power is turned off, a purge operation may be performed for 30
seconds at the maximum on RX-8500 or 60 seconds at the maximum on RX-8700 to clean the inside
of the gas monitor.
<RX-8500>
<RX-8700>
A purge operation is performed in the H2S [high concentration]
measuring mode (HI) and then the HC/O2/H2S [low
concentration] measuring mode (LO).
- 43 -
5. Setting Procedure
5-1. Display/setting mode
5
5.
Setting Procedure
5-1. Display/setting mode
This mode allows users to display or change various settings.
RX-8500
1
RX-8700
Press the PEAK button on the
measurement screen.
The following display/setting screens are
displayed in turn by pressing the PEAK
button.
・ Press PEAK once: PEAK display/clear
・ Press PEAK twice: Alarm setpoint
display
・ Press PEAK three times: Clock display
・ Press PEAK four times: Station ID
display
・ Press PEAK five times: Log data
display
・ Press PEAK six times: Return to the
measurement screen
1
Hold down the PEAK button on
the measurement screen (about
three seconds).
2
Release the button when the
buzzer blips twice.
・ Hold down PEAK: PEAK display/clear
3
Press the PEAK button again.
The following display/setting screens are
displayed in turn by pressing the PEAK
button.
・ Hold down PEAK and then press it
once: Alarm setpoint display
・ Hold down PEAK and then press it
twice: Clock display
・ Hold down PEAK and then press it three
times: Station ID display
・ Hold down PEAK and then press it four
times: Log data display
・ Hold down PEAK and then press it five
times: Return to the measurement
screen
NOTE
 When the unoperated period lasts about 20 seconds, the measurement screen returns automatically.
 [RX-8700] When the button is released after the buzzer blips once in the step 2, it causes a switch
between the H2S [high concentration] measuring mode and HC/O2/H2S [low concentration]
measuring mode and fails to enter the display/setting mode.
 [RX-8700] The display/setting mode can be entered from either of the two modes (H2S [high
concentration] measuring mode and HC/O2/H2S [low concentration] measuring mode).
- 44 -
5. Setting Procedure
Item
PEAK display/clear
5-1. Display/setting mode
Details
LCD display
Displays the maximum
concentration (or minimum
concentration for oxygen)
obtained during
measurement from
power-on to the present.
Clears a peak value as
well.
PEAK display on RX-8500
Remarks
Go to the
display/clear
screen
(P. 46)
Alarm setpoint display
(Full scale/alarm
setpoint display/gas
alarm test)
Displays the full scale
value and first and second
alarm setpoints, and
allows users to check
alarm activation.
* The gas alarm function is
an optional function.
Clock display
Displays the current date
and time.
Station ID display
Displays station IDs
registered in advance.
ID selection is also
available.
Press the
ENTER button
to go to the
display/selection
screen
(P. 48)
Log data display
Displays data recorded in
the manual memory.
Press the
ENTER button
to go to the
display screen
(P. 49)
- 45 -
Press the
ENTER button
to go to the
display screen
(P. 47)
5. Setting Procedure
5-2. PEAK display/clear
5-2. PEAK display/clear
This item displays or clears the maximum concentration (or minimum concentration for oxygen) obtained
during measurement from power-on to the present.
1
Display the screen shown in the right figure on
each model.
RX-8500
RX-8700
Press the PEAK button once
on the measurement screen.
Hold down the PEAK button on
the measurement screen
(about three seconds).
2
Hold down the ▼ button to clear PEAK value.
3
Release the ▼ button when "RELEASE" is
displayed.
PEAK display on RX-8500
PEAK value has been cleared.
After clearing the value, the buzzer blips and the screen in the step
1 returns.
NOTE
 When the unoperated period lasts about 20 seconds, the screen in the step 1 is replaced with the
measurement screen.
- 46 -
5. Setting Procedure
5-3. Full scale/alarm setpoint display/gas alarm test (optional function)
5-3. Full scale/alarm setpoint display/gas alarm test
(optional function)
This item displays the full scale value and first and second alarm setpoints, and allows users to check
alarm activation.
Normally the gas alarm function is set to OFF and unavailable (optional function). To use this function,
please contact RIKEN KEIKI.
1
Display the screen shown in the right figure on
each model.
"ALARM-P" and "YES/ENT" are displayed alternately in the lower
part of the screen.
RX-8500
RX-8700
Press the PEAK button twice
on the measurement screen.
•
•
▲
▼
Hold down the PEAK
button on the
measurement screen
(about three seconds).
Press the PEAK button
once.
2
Press the ENTER button.
3
Press the ▲/▼ button to display the full scale or
first/second alarm setpoint value.
Display example of the case without alarm setpoints on RX-8500
Full scale value
The OVER alarm (over scale)
activation occurs in an alarm
test.
4
First alarm setpoint
"OFF" appears in the
concentration display area.
Second alarm setpoint
"OFF" appears in the
concentration display area.
Display a desired screen and press the ENTER
button.
The alarm LED arrays blink in red, allowing the user to check the
alarm activation of the screen displayed.
5
Press the ENTER or ESC button to stop the alarm
activation.
Pressing the ENTER button stops the alarm activation.
Pressing the ESC button stops the alarm activation and then
returns to the screen in the step 1.
- 47 -
5. Setting Procedure
5-4. Station ID display
NOTE
 When the unoperated period lasts about 20 seconds, the screen in the step 1 is replaced with the
measurement screen.
 No display switch is made during alarm test.
5-4. Station ID display
This item displays the registered station IDs and allows users to make a selection.
1
Display the screen shown in the right figure on
each model.
RX-8500
RX-8700
Press the PEAK button four
times on the measurement
screen.
•
•
Hold down the PEAK
button on the measurement
screen
(about three seconds).
Press the PEAK button
three times.
2
Press the ENTER button.
3
Select station ID with the ▲/▼ button.
When an ID change is not necessary, press the ESC button.
4
Press the ENTER button.
When the ID display is finished, the buzzer blips and the screen in
the step 1 returns.
NOTE
 When the unoperated period lasts about 20 seconds, the screen in the
step 1 is replaced with the measurement screen.
 When the unit is used for the first time, station ID is displayed as
shown in the right figure.
 On the gas monitor, IDs from ST-ID000 to ST-ID127 have been
registered, unless otherwise specified.
 The data logger management program (optional) is required to register
or change an ID.
Please contact RIKEN KEIKI for more information.
- 48 -
5. Setting Procedure
5-5. Log data display
5-5. Log data display
This item displays the gas concentration data recorded in the manual memory.
1
Display the screen shown in the right figure on
each model.
RX-8500
RX-8700
Press the PEAK button four
times on the measurement
screen.
•
•
Hold down the PEAK
button on the measurement
screen
(about three seconds).
Press the PEAK button
three times.
2
Press the ENTER button.
3
Select log data with the ▲/▼ button and then
press the ENTER button.
The concentration value of the selected log data is displayed.
Press the ESC button to return to the screen in the step 1.
4
Press the ENTER button.
Display example on
When the log data display is finished, the buzzer blips and the
RX-8500
screen in the step 2 returns.
NOTE
 When the unoperated period lasts about 20 seconds, the screen in the step 1 or 3 is replaced with
the measurement screen.
- 49 -
6. Fault Alarm Function
Fault alarm activation
6
6.
Fault Alarm Function
Fault alarm activation
"Fault alarm" is triggered when an abnormality is detected in the gas monitor. (Self-latching)
In response to a fault alarm, the buzzer sounds and alarm LED arrays blink.
• Sounding buzzer: Repeatedly sounds intermittent beeps at about one-second intervals. "Beep-beep,
beep-beep"
• Blinking alarm LED arrays: Repeatedly blinks at about one-second intervals.
<Fault alarm activation on RX-8500>
The alarm LED arrays on the top, left and right blink.
<Fault alarm activation on RX-8700>
Only the alarm LED arrays on the top blink.
Beep-beep,
beep-beep
Beep-beep,
beep-beep
There are following alarm types: low flow rate, battery voltage abnormalities, calibration failure, sensor
abnormalities, system abnormalities and clock abnormalities.
The following shows display examples of fault alarms.
(RX-8500)
(RX-8700: Measuring H2S)
(RX-8700: Measuring
low-concentration hydrogen sulfide)
Low flow rate
Battery voltage abnormalities
Calibration failure
- 50 -
Sensor abnormalities
6. Fault Alarm Function
System abnormalities
Fault alarm activation
Clock abnormalities
If a fault alarm is triggered, determine the cause and take appropriate action.
If the gas monitor has problems and is repeatedly malfunctioning, contact RIKEN KEIKI immediately.
NOTE
 For information on malfunctions (error messages), see "Troubleshooting" (P. 64).
- 51 -
7. Maintenance
7-1. Maintenance intervals and items
7
7.
Maintenance
The gas monitor is an important instrument for the purpose of safety.
To maintain the performance of the gas monitor and improve the reliability of safety, perform a regular
maintenance.
7-1. Maintenance intervals and items
Perform the following maintenance regularly before use.
•
•
Daily maintenance: Perform maintenance before beginning to work.
Regular maintenance: Perform maintenance once or more for every six months to maintain the
performance as a safety unit.
Maintenance
item
Daily
maintenance
Regular
maintenance
Check that the battery level is sufficient.
○
○
Make the gas monitor draw in fresh air. Check that
the concentration display value is zero (0, or 20.9
vol% for the oxygen concentration display). If it is not
zero (0, or 20.9 vol% for the oxygen concentration
display), perform air calibration.
○
○
Check the flow rate indicator for abnormalities.
○
○
Filter check
Check the dust filter for dust or clogging.
○
○
Span
adjustment
Perform span adjustment using a calibration gas.
―
○
Battery level
Concentration
display check
Flow rate
check
Maintenance content
WARNING
 If any abnormality is found in the gas monitor, promptly contact RIKEN KEIKI.
NOTE
 Perform span adjustment using a calibration gas at least once every six months.
 The span adjustment requires dedicated equipment and creation of calibration gas. Therefore,
contact RIKEN KEIKI for span adjustment.
 The built-in sensors of the gas monitor have a validity period and must be replaced regularly.
 The sensor life has expired if, for example, the sensors cannot be calibrated in span adjustment, the
readings do not come back after air calibration, or the readings fluctuate. In this case, contact RIKEN
KEIKI. Note that the warranty period is one year.
- 52 -
7. Maintenance
7-1. Maintenance intervals and items
About maintenance services
We provide services on regular maintenance including span adjustment, other adjustments and
maintenance.
To make the calibration gas, dedicated tools, such as a gas cylinder of the specified concentration and gas
sampling bag, must be used.
Our qualified service engineers have expertise and knowledge on the dedicated tools used for services,
along with other products. To maintain the safety operation of the gas monitor, please use our maintenance
service.
The followings are typical maintenance services. Contact RIKEN KEIKI for more information.
<Main services>
Item
Details
Battery level
Checks the battery level.
check
Verifies that the concentration display value is zero (0, or 20.9 vol% for the oxygen
Concentration
concentration display) using a zero gas.
display check
Performs air calibration if the reading is incorrect.
Flow rate check
Checks the flow rate using an external flow meter.
Filter check
Checks the dust filter for dust or clogging.
Replaces a dirty or clogged dust filter.
Span
adjustment
Performs span adjustment using a calibration gas.
Cleaning and
repair of the unit
(visual
diagnosis)
Unit operation
check
Replacement of
consumable
parts
Checks dust or damage on the surface of the unit, cleans and repairs such parts.
Replaces parts which are cracked or damaged.
Operates the buttons to check the operation of functions and parameters, etc.
Replaces consumable parts, such as a sensor, filter and pump.
- 53 -
7. Maintenance
7-2. Span adjustment
7-2. Span adjustment
Perform span adjustment of sensors using a calibration gas more than once every six months.
7-2-1. Preparation
The zero and span adjustment requires dedicated equipment and a calibration gas. Please contact RIKEN
KEIKI .
<Required Equipment/Material>


Calibration gas (optional)
Gas sampling bag (optional)
7-2-2. How to connect
Connect the devices as shown below to perform span adjustment.
Gas sampling
probe
(with a tube)
Gas
sampling
bag
Gas outlet
(GAS OUT)
Gas inlet
(GAS IN)
WARNING
 Do not apply pressure to the gas sampling bag after attaching it. It may cause a calibration gas
to leak inside and result in a calibration failure.
Calibration gas
 A calibration gas uses a hazardous gas (combustible gas, toxic gas, oxygen deficiency, etc.).
Handle the gas and related jigs and tools with careful attention to the followings.
Gas sampling bag
 Use different gas sampling bags for each gas type and concentration to perform accurate
calibration.
Place for span adjustment
 Do not perform calibration in a confined space.
 Perform span adjustment in a place where no silicone, spray can gases, etc. is used.
 Perform calibration indoors at normal temperatures without remarkable fluctuation (within
±5ºC).
 A calibration gas uses a hazardous gas (combustible gas, toxic gas, oxygen deficiency, etc.).
Therefore, be sure to perform calibration in an exhaust booth or collect the calibration gas in an
exhaust bag.
CAUTION
 Do not use a lighter gas to check the sensitivity of the gas monitor. A constituent of the lighter
gas may deteriorate the sensor performances.
- 54 -
7. Maintenance
7-2. Span adjustment
7-2-3. Span adjustment procedure
Perform the span adjustment using the procedure shown below.
1
Prepare an optional calibration gas and set of gas
sampling bags.
2
Check that the relay tube, filter tube, gas sampling
hose and gas sampling probe are connected to the
gas inlet (GAS IN) of the gas monitor.
3
Check that the
measurement screen is
displayed on the gas
monitor.
4
Perform air calibration.
Measurement screen on
RX-8500
Measurement screen on
RX-8700
See "4-6. Air calibration". (P. 37)
For RX-8700, perform air calibration in each of the two modes (H2S
[high concentration] measuring mode and HC/O2/H2S [low
concentration] measuring mode).
5
Collect a calibration gas in each gas sampling
bag.
6
Hold down the ▲ and ▼ buttons at the same time
on the measurement screen (over one second).
The gas monitor enters the calibration mode.
7
Select the gas type to be calibrated with the ▲/▼
button.
Pressing the ENTER button while "ESCAPE" is displayed returns to
the measurement screen.
<Calibration mode display on RX-8500>
CH4 %LEL adjustment
CH4 vol% adjustment
O2 % adjustment
CO ppm adjustment
CO2 vol% adjustment
- 55 -
7. Maintenance
7-2. Span adjustment
<Calibration mode display on RX-8700>
HC %LEL adjustment
8
HC vol% adjustment
O2 % adjustment
H2S ppm adjustment
<low concentration>
H2S ppm adjustment
<high concentration>
Press the ENTER button when the screen is
displayed.
The concentration display blinks to indicate that calibration is ready.
9
Connect the gas sampling bag containing the
calibration gas which is the same as the selected
gas type to the gas sampling probe connected to
the gas monitor. Then introduce the gas into the
gas monitor.
Wait until the concentration display is stabilized.
10
When the concentration display is stabilized,
adjust it to the calibration gas concentration
using the ▲/▼ button.
▲
▼
Display example on
RX-8500
(Methane (CH4) %LEL
calibration)
11
Press the ENTER button.
"END" appears when the calibration has finished.
- 56 -
7. Maintenance
7-2. Span adjustment
12
Perform calibration for other gas types in the
same manner.
13
Return to the measurement screen when
calibration for all gas types has finished.
The measurement screen does not return automatically in the
calibration mode.
To return to the measurement screen from the calibration mode,
press the ▲/▼ button, select "ESCAPE" and then press the
ENTER button.
WARNING
 Return to the measurement screen when calibration has finished. The measurement screen
does not return automatically in the calibration mode.
NOTE
 If the ▲ and ▼ buttons are not pressed at the same time, the air calibration (P. 37) screen is
displayed. In this case, release both buttons and try again.
 While calibration is in process, press the ESC button to stop the process. The measurement screen
returns.
- 57 -
7. Maintenance
7-3. How to clean
7-3. How to clean
Clean the gas monitor if it becomes extremely dirty. The gas monitor must be turned off while cleaning it.
Use a waste cloth or the like to remove dust. Do not use water or organic solvent for cleaning because they
may cause malfunctions.
If the inside of the gas sampling hose is extremely contaminated, clean it with dry air, etc. to avoid adverse
influence on gas measurement.
CAUTION
 When cleaning the gas monitor, do not splash water over it or use organic solvents such as
alcohol and benzine on it. Otherwise, it may cause discoloration or damage to the surface of
the gas monitor or a sensor failure.
NOTE
 When the gas monitor gets wet, water may remain in the buzzer sound opening or grooves. Drain
water as follows:
(1) Wipe away moisture on the gas monitor thoroughly using a dry towel, cloth, etc.
(2) While holding the gas monitor firmly, shake it about ten times with the buzzer sound opening
facing downward.
(3) Wipe away moisture coming out from the inside thoroughly using a towel, cloth, etc.
(4) Place the gas monitor on a dry towel, cloth, etc. and let it stand at normal temperatures.
- 58 -
7. Maintenance
7-4. Parts replacement
7-4. Parts replacement
7-4-1. Sensor replacement
The built-in sensors of the gas monitor must be replaced regularly.
See the regular replacement parts (P. 61) for recommended replacement intervals.
The sensor life has expired if, for example, the sensors cannot be adjusted in calibration, the readings do
not come back after air calibration, or the readings fluctuate.
In this case, contact RIKEN KEIKI.
7-4-2. Replacement procedure for gas sampling probe dust
filter
The gas sampling probe has a built-in dust filter.
Because the dust filter may gradually get dirty or clogged over time, it must be replaced regularly according
to the operating conditions.
It must be replaced especially when it shows a sign of water absorption, low flow rate or contamination.
1
Rotate the end of the probe
counterclockwise and remove
it.
A round dust filter is contained here.
Check it for contamination or clogging.
Replace the dust filter if it is contaminated
heavily or clogged.
2
Take out the filter and replace it
with new one.
3
Reattach the filter case.
NOTE
 Use only the filters specified by RIKEN KEIKI.
 The dust filter of the gas sampling probe is different from that of the filter tube. Use the specified filter
for each part.
 See the regular replacement parts (P. 61) for a replacement filter.
- 59 -
7. Maintenance
7-4. Parts replacement
7-4-3. Replacement procedure for filter tube dust filter
1
Loosen the cap (black) and remove
it.
Cap (black)
Joint
2
3
As shown in the right figure, take
out the dust filter from the cap
(black) and replace it with new
one.
O-ring (S14)
Filter
* The mesh side
should face the
O-ring (S14).
Reattach the cap (black).
Cap (black)
NOTE
 Use only the filters specified by RIKEN KEIKI.
 The dust filter of the gas sampling probe is different from that of the filter tube. Use the specified filter
for each part.
 See the regular replacement parts (P. 61) for a replacement filter.
7-4-4. Replacement procedure for filter tube absorbent cotton
1
Cut an absorbent cotton to the
size shown in the right figure
(about 1.3 g) and round it into a
shape.
2
Loosen the cap and remove it.
3
Replace the absorbent cotton.
Absorbent
cotton
Cap (black)
Put the absorbent cotton into the pipe without
a gap between the pipe and cotton.
4
Pipe
Reattach the cap (black).
- 60 -
Absorbent
cotton
7. Maintenance
7-4. Parts replacement
7-4-5. Replacement of regular replacement parts
Replace the regular replacement parts of the gas monitor according to the recommended intervals.
<List of Recommended Regular Replacement Parts>
Item
Maintenance
intervals
Replacement
intervals
6 months 1 year
6 months 1 year
6 months 1 year
6 months 1 year
Quantity
Internal filter
6 months
1 pc
Dust filter (10 pcs for gas sampling
probe)
6 months
Dust filter (10 pcs for filter tube)
6 months
Absorbent cotton (25 g for filter
tube)
6 months
CO2 removal filter
6 months
1 year
1 pc
1 pc
1 pc
1.3 g
Remarks
*
Part number 4181 5452
30
Part number 4777 9022
50
Part number 1879 0011
10
RX-8500 only
Part number 0913 0028
30
Combustible gas (CH4)/
carbon dioxide (CO2) sensor
Carbon monoxide (CO) sensor
6 months
5 years
1 pc
RX-8500 only*
6 months
1 year
1 pc
Oxygen (O2) sensor
6 months
1 year
1 pc
Combustible gas (HC) sensor
Hydrogen sulfide (H2S) [low
concentration] sensor
Hydrogen sulfide (H2S) [high
concentration] sensor
Pump unit (RP-11)
Rubber seals
Tubes
6 months
5 years
1 pc
RX-8500 only*
Shared by RX-8500 and
RX-8700*
RX-8700 only*
6 months
1 year
1 pc
RX-8700 only*
6 months
1 year
1 pc
RX-8700 only*
6 months
6 months
1 - 2 years
2 years
3 - 8 years
1 pc
1 set
1 set
*
*
*
Part number 4777 9025
Protection film (5 pcs)
1 pc
70
About 500 cycles of
Lithium ion battery pack
1 pc
charging and
(For BUL-8000(Z1))
discharging
AA type.
Alkaline dry battery
3 pcs
When alkaline dry
(For dry battery unit BUD-8000(Z))
battery unit is used.
* The operation must be checked after replacement by a qualified service engineer. For the stable operation
of the gas monitor and safety, ask a qualified service engineer to take care of replacement of the parts.
Please contact RIKEN KEIKI.
NOTE
 The above replacement intervals are recommendation only. The intervals may change depending on
the operating conditions. These intervals do not mean the warranty periods either. The result of the
regular maintenance may determine when to replace the parts.
- 61 -
8. Storage and Disposal
for a long time
8-1. Procedures to store the gas monitor or leave it
8
8.
Storage and Disposal
8-1. Procedures to store the gas monitor or leave it
for a long time
The gas monitor must be stored under the following environmental conditions.
• In a dark place under the normal temperature and humidity away from direct sunlight
• In a place where gases, solvents, vapors, etc. are not present
Store the gas monitor in a shipping carton, if any, in which the product was delivered.
Store the gas monitor away from dust, etc. if the shipping carton is not available.
CAUTION
 If the gas monitor is not used for a long time, store it after removing the batteries from the dry
battery unit. Leaks from dry batteries may result in fire or injury. If the gas monitor is not used
for a short time, store it without removing the batteries. Since the sensor of the gas monitor is
energized at all times including power-off time, it is necessary to store the gas monitor with the
batteries in it.
 If the gas monitor is not used for a long time, turn on the power at least once every six months
and check that the pump draws in air (about three minutes). The gas monitor, when not
activated for a long time, may cease to work because of hardening of the grease in the pump
motor.
NOTE
 If the gas monitor with the lithium ion battery unit attached is not used for a long time, it is
recommended to store it after discharging the batteries until the battery level icon shows one battery
mark or so. If the gas monitor is stored with the batteries fully charged, the batteries get deteriorated
more quickly and may have shorter life.
 If the gas monitor with the dry battery unit attached is not used for a short time, store it with dry
batteries attached. Since the sensor of the gas monitor is energized at all times including power-off
time, it is required to keep dry batteries attached for storage.
8-2. Procedures to use the gas monitor again
When using the gas monitor after storage, perform calibration.
CAUTION
 Contact RIKEN KEIKI for readjustment including calibration.
 If there is a sudden temperature change of 15ºC or more between the storage and operational
locations, turn on the power of the gas monitor, let it stand for about 10 minutes in a similar
environment to the operational location, and perform air calibration in fresh air before using it.
- 62 -
8. Storage and Disposal
8-3. Disposal of products
8-3. Disposal of products
When the gas monitor is disposed of, it must be treated properly as an industrial waste in accordance with
the local regulations.
WARNING
 Do not disassemble the carbon monoxide, hydrogen sulfide or oxygen sensor because it
contains 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. Dispose of batteries
in accordance with procedure specified by the local authority.
<Disposal in EU Member States>
When disposing of the gas monitor in EU member states, sort the batteries as specified.
Handle the batteries removed from the lithium ion battery unit (BUL-8000(Z1)) or dry batteries used for the
dry battery unit (BUD-8000(Z)) according to the classified refuse collection system and recycling system
based on the regulations of EU member states.
<Removing battery of lithium ion battery unit>
Remove the lithium ion battery unit with reference to "Charging the lithium ion battery unit (BUL-8000(Z1))"
(P. 24).
<Removing batteries>
Remove batteries with reference to "Attaching batteries to the dry battery unit (BUD-8000(Z), option)" (P.
26).
NOTE
Crossed-out recycle dustbin mark
 This symbol mark is indicated on the products which contain the batteries which fall
under EU Battery Directive 2006/66/EC. Such batteries need to be disposed of as
specified by the latest Directive. This symbol mark indicates that the batteries need
to be separated from the ordinary waste and disposed of appropriately.
- 63 -
9. Troubleshooting
9-1. Abnormalities on unit
9
9.
Troubleshooting
The troubleshooting does not explain the causes of all the malfunctions which may occur on the gas
monitor. This simply helps to find the causes of malfunctions which may frequently occur.
If the gas monitor shows a symptom which is not explained in this manual, or still has malfunctions even
though remedial actions are taken, please contact RIKEN KEIKI.
9-1. Abnormalities on unit
Symptoms
Causes
Actions
The battery level is too low.
The power cannot be
turned on.
Lithium ion battery unit: Charge in a safe
place.
Dry battery unit: Replace all the three dry
batteries with new ones in a safe place.
The POWER button was
released quickly.
For power-on, keep the POWER button
pressed until a blip is heard.
Improper installation of the
battery unit
Check whether the battery unit is properly
attached to the main unit.
Abnormal operations
Disturbances by sudden
static electricity noise, etc.
Turn off the power once and then turn it on
again (restart).
Cannot operate the gas
monitor.
Disturbances by sudden
static electricity noise, etc.
Remove the battery unit in a safe place.
Then reinstall it and turn on the power to
perform operations.
System abnormalities
FAIL SYSTEM
A circuit abnormality
occurred.
Please contact RIKEN KEIKI for repair.
A sensor has failed.
Please contact RIKEN KEIKI to replace the
sensor.(If "FAIL" is displayed in place of
measured value at power-on, the alarm can
be reset by pressing the ESC button. The
operation can be continued using only the
normal sensors to detect other gases.)
Sensor abnormalities
FAIL SENSOR
A low battery voltage
alarm is displayed.
FAIL BATTERY
Lithium ion battery unit: Turn off the power
and charge it in a safe place.
The battery level is low.
- 64 -
Dry battery unit: Turn off the power and
replace the dry batteries with new ones in a
safe place.
9. Troubleshooting
A low flow rate alarm is
displayed.
FAIL LOW FLOW
Air calibration
impossible
FAIL AIR CAL
Clock abnormalities
FAIL CLOCK
The batteries cannot be
charged.
(Lithium ion battery unit
only)
9-1. Abnormalities on unit
Water, oil or the like is
drawn.
Check the gas sampling hose for any
damage or mark of drawn water, oil, etc.
The gas sampling hose is
clogged.
Check the gas sampling hose for
connections, clogging, twisting, etc.
The gas monitor was
powered on at a low
temperature or has not
been used for a long time.
Cycle the power several times. The pump
may start operating.
The pump has deteriorated.
Please contact RIKEN KEIKI to replace the
pump.
Fresh air is not supplied
around the gas monitor.
Draw fresh air properly and perform air
calibration again. (P. 37)
A sensor has failed.
Please contact RIKEN KEIKI for repair.
Abnormalities of the internal
clock
Make a setting of date/time.
If a symptom like this is observed
repeatedly, the built-in clock is seemingly
malfunctioning. Thus, it must be replaced.
Please contact RIKEN KEIKI.
The charger is not
connected properly.
Connect the AC plug and DC plug of the
AC adapter properly.
A charging circuit
abnormality occurred.
Please contact RIKEN KEIKI for repair..
The batteries have been
fully charged.
When fully charged batteries are charged
again, the charging indicator lamp does not
go on.
- 65 -
9. Troubleshooting
9-2. Abnormalities of readings
9-2. Abnormalities of readings
Symptoms
The reading rises
(drops) and it remains
so.
Slow response
Span adjustment
impossible
Causes
Actions
Drifting of sensor output
Perform the air calibration. (P. 37)
Presence of interference
gas
Disturbances by interference gases, such
as solvents, cannot be eliminated
completely. Contact RIKEN KEIKI for
measures to take, such as a use of removal
filter.
Slow leak
A very small amount of the gas to be
measured may be leaking (slow leak).
Because ignoring it may cause dangers,
take actions and measures which are taken
at an occurrence of gas alarm.
Environmental changes
Perform the air calibration. (P. 37)
In particular, the oxygen sensor is affected
by the air pressure.
Clogged dust filter
Replace the dust filter. (P. 59)
Bended or clogged gas
sampling hose
Fix the defective parts.
Condensation is formed
inside the gas monitor.
Fix the defective parts.
Deteriorated sensor
sensitivity
Please contact RIKEN KEIKI to replace the
sensor.
Improper calibration gas
concentration
Use the proper calibration gas.
Deteriorated sensor
sensitivity
Please contact RIKEN KEIKI to replace the
sensor.
- 66 -
10. Product Specifications
10-1. RX-8500 specifications
10
10.
Product Specifications
10-1. RX-8500 specifications
10-1-1. List of RX-8500 specifications
Combustible gas
(CH4)
Oxygen
(O2)
Carbon monoxide
(CO)
Carbon dioxide
(CO2)
Non-dispersive
infrared type
Galvanic cell type
Electrochemical
type
Non-dispersive
infrared type
Measuring range
<Service range>
0 - 100.0% LEL/
5 - 100.0 vol%
0 - 25.0 vol%
<25.1 - 40.0 vol%>
0 - 1000 ppm
0 - 20.0 vol%
Minimum
resolution
0.5% LEL
(0 - 100.0% LEL)
0.5 vol%
(5.0 - 100.0 vol%)
1ppm
0.01 vol%
(0 - 2.00 vol%)
0.05 vol%
(2.00 - 5.00 vol%)
0.1 vol%
(5.00 - 20.0 vol%)
Measuring gas
Measuring
principle
Concentration
display
Sampling method
Suction flow rate
Displays
Buzzer sound
volume
Fault alarm/self
diagnosis
Fault alarm display
Fault alarm pattern
Transmission
method
Functions
Power supply
Continuous
operating time
Operating
temperatures
Operating
humidities
Structure
0.1vol%
LCD digital (7-segment + Symbol + Bar meter)
Sample-drawing
0.75 L/min or more (Open flow rate)
Battery level icon, pilot indicator, and pump operation status indicator
95 dB (A) or higher (30 cm)
Low flow rate, battery voltage abnormalities, calibration failure, sensor abnormalities,
system abnormalities and clock abnormalities.
Lamp blinking, intermittent buzzer sounding, and detail display
Self-latching
IrDA (for data logger)
LCD backlight, peak display, pump stop, data logger and log data display
Dedicated lithium ion battery unit [BUL-8000(Z1)] <Standard>
Or dedicated dry battery unit <AA alkaline dry battery*1 x 3> [BUD-8000(Z)] <Option>
BUL-8000(Z1): About 15 hours (25°C, no alarm, no lighting and battery fully charged)
<Standard>
BUD-8000(Z): About 8 hours (25°C, no alarm and no lighting) <Option>
-20 - +50ºC (at a constant condition)
Below 95% RH (Non-condensing)
Drip-proof and dust-proof performances (compliant to IP67 level)
- 67 -
10. Product Specifications
Explosion-proof
structure
Explosion-proof
class
Dimensions
10-1. RX-8500 specifications
Intrinsically safe explosion-proof structure
Ex ia IIC T4 Ga (ATEX/IECEx<Presafe>) / Ex ia llC T4X (TIIS)
Approx. 154 (W) x 81 (H) x 163 (D) mm (projection portions excluded)
About 1.2 kg (with BUL-8000(Z1)) <Standard> or about 1.1 kg (with BUD-8000(Z))
Weight
<Option>
*1 Use AA alkaline batteries (LR6) produced by TOSHIBA CORPORATION to meet the conditions for
explosion-proof performance.
10-1-2. RX-8500 standard accessories
•
•
•
•
•
•
•
•
•
Lithium ion battery unit
(BUL-8000(Z1))
AC adapter for charging
Gas sampling probe and gas
sampling hose
Filter tube (CF-8385)
Relay tube
Absorbing tube fixing belt
Shoulder strap
CO2 removal filter
CO2 filter fixing belt
- 68 -
: 1 pc (attached to main unit)
: 1 pc
: 1 pc
: 1 pc
: 1 pc
: 2 pcs
: 1 pc
: 1 pc
: 1 pc
10. Product Specifications
10-2. RX-8700 specifications
10-2. RX-8700 specifications
10-2-1. List of RX-8700 specifications
Combustible gas*1
(HC)
Oxygen
(O2)
Hydrogen sulfide
(H2S)
Non-dispersive
infrared type
Galvanic cell type
Electrochemical type
Measuring range
<Service range>
0 - 100.0% LEL/
2 - 100.0 vol%
0 - 25.0 vol%
<25.1 - 40.0 vol%>
[Low concentration]
0 - 30.0 ppm
<30.5 - 100.0 ppm>
[High
concentration]
0 - 1000 ppm
Minimum
resolution
0.5% LEL
(0 - 100.0% LEL)
0.5 vol%
(5.0 - 100.0 vol%)
0.1vol%
0.5ppm
1ppm
Concentration
display
LCD digital (7-segment + Symbol + Bar meter)
Sampling method
Sample-drawing
Suction flow rate
0.75 L/min or more (Open flow rate)
Displays
Battery level icon, pilot indicator, and pump operation status indicator
Measuring gas
Measuring
principle
Buzzer sound
volume
Fault alarm/self
diagnosis
95 dB (A) or higher (30 cm)
Low flow rate, battery voltage abnormalities, calibration failure, sensor abnormalities,
system abnormalities and clock abnormalities.
Fault alarm display
Lamp blinking, intermittent buzzer sounding, and detail display
Fault alarm pattern
Self-latching
Transmission
method
IrDA (for data logger)
Functions
LCD backlight, peak display, pump stop, data logger and log data display
Power supply
Continuous
operating time
Operating
temperatures
Operating
humidities
Structure
Explosion-proof
structure
Explosion-proof
class
Dimensions
Dedicated lithium ion battery unit [BUL-8000(Z1)] <Standard>
Or dedicated dry battery unit <AA alkaline dry battery*2 x 3> [BUD-8000(Z)] <Option>
BUL-8000(Z1): About 15 hours (25°C, no alarm, no lighting and battery fully charged)
<Standard>
BUD-8000(Z): About 8 hours (25°C, no alarm and no lighting) <Option>
-20 - +50ºC (at a constant condition)
Below 95% RH (Non-condensing)
Drip-proof and dust-proof performances (compliant to IP67 level)
Intrinsically safe explosion-proof structure
Ex ia IIC T4 Ga (ATEX/IECEx<Presafe>) / Ex ia llC T4X (TIIS)
Approx. 154 (W) x 81 (H) x 163 (D) mm (projection portions excluded)
About 1.3kg (with BUL-8000(Z1)) <Standard> or about 1.2kg (with BUD-8000(Z))
<Option>
*1 The combustible gas HC concentration is displayed in isobutane conversion.
*2 Use AA alkaline batteries (LR6) produced by TOSHIBA CORPORATION to meet the explosion-proof
conditions.
Weight
- 69 -
10. Product Specifications
10-2. RX-8700 specifications
10-2-2. RX-8700 standard accessories
•
•
•
•
•
•
•
Lithium ion battery unit
(BUL-8000(Z1))
AC adapter for charging
Gas sampling probe and gas
sampling hose
Filter tube (CF-8385)
Relay tube
Absorbing tube fixing belt
Shoulder strap
- 70 -
: 1 pc (attached to main unit)
: 1 pc
: 1 pc
: 1 pc
: 1 pc
: 2 pcs
: 1 pc
10. Product Specifications
10-3. List of optional items
10-3. List of optional items
Leather case
Sampling probe holder
Waist strap
Waist strap fixing tool
Protection film
Protection film (5 pcs)
Lithium ion battery unit (BUL-8000(Z1))
AC adapter
AC adapter replacement plug
Dry battery unit (BUD-8000(Z))
AA alkaline battery (TOSHIBA)
Absorbent cotton (for CF-8385)
Dust filter (10 pcs) (for CF-8385)
Dust filter (10 pcs) (for gas sampling probe)
Optional items
Data logger management program
(sold separately)
Demand flow valve
Trap filter
Sampling hose with weight (30 m)
Sampling hose with float (30 m)
Aluminum trunk case
Shipboard storage box (metal)
Set of gas sampling bags
Calibration gas can (0.6 L N2: 99.99% or more)
Calibration gas can (0.6 L i-C4H10: 50% LEL, Air: balance)
Calibration gas can (0.6 L i-C4H10: 10%, N2: balance)
Calibration gas can (0.6 L CH4: 70% LEL, N2: balance)
Calibration gas can (0.6 L CH4: 70%, N2: balance)
Calibration gas can (0.6 L CO2: 10%, N2: balance)
Calibration gas can (0.6 L CO: 145 ±5 ppm, N2: balance)
Hydrogen sulfide calibration gas kit (CK-82)
CAUTION
Be sure to use the sampling hose with weight (30 m) in combination with the filter tube
(CF-8385) for dust removal and water-proof performance.
If water, etc. is drawn while the filter tube is unattached, it enters the inside of the unit and
causes a trouble.
- 71 -
11. Appendix
11-1. Definition of terms
11
11.
Appendix
11-1. Definition of terms
vol%
Gas concentration indicated in the unit of one-hundredth of the volume
ppm
Gas concentration indicated in the unit of one-millionth of the volume
LEL
The acronym of Lower Explosive Limit.
LEL refers to the lowest concentration of a combustible gas in air capable of causing
explosion when ignited.
Self-latching
One of alarm patterns. Once an alarm is triggered, this keeps the alarm activated
until it is reset even when the alarm conditions are not met.
11-2. Calibration history/various trend/event history
functions
The gas monitor has history and trend functions. To use this function, please contact RIKEN KEIKI.
NOTE
 The data logger management program (optional) is required to use the history and trend functions.
Contact RIKEN KEIKI for more information.
Data logger provides five functions.
(1) Interval trend
Records the change of measured concentration from power-on to power-off.
Up to 100 latest data are recorded.
After the number of recorded data reaches 100, the oldest data will be overwritten by the latest data.
* However, when the maximum recording time is exceeded, the oldest data will be deleted before reaching
100.
The maximum recording time is specified as follows for each interval time.
10-second 20-second 30-second 1-minute 3-minute
Interval time
10 hours
20 hours
30 hours
60 hours
180
Maximum
hours
recording time
* The standard interval time is "5 minutes."
Interval time can be set by "Data Logger Management Program" (optional).
- 72 -
5-minute
300
hours
10-minute
600 hours
11. Appendix
11-2. Calibration history/various trend/event history functions
(2) Alarm trend
Starting immediately after the alarm is triggered, this function records the change of measured
concentration for one hour, which is from 30 minutes before the alarm was triggered until 30 minutes after
the alarm was triggered.
Alarm trend records the peak value of five-second time at a 5-second interval.
Last eight measurement data shall be recorded.
When the number of data exceeds eight, the oldest data will be overwritten by the latest data.
(3) Alarm event
Records the trigger of alarm as an event.
The event records the time of alarm trigger, target measuring gas and type of alarm event (full scale, first or
second alarm setpoint).
Up to 100 latest events are recorded.
After the number of recorded events reaches 100, the oldest data will be overwritten by the latest data.
(4) Trouble event
Records the trigger of fault alarm as an event.
The event records the time when the trouble was triggered, the target gas of measurement, and the type of
fault event.
Up to 100 latest events are recorded.
After the number of recorded events reaches 100, the oldest data will be overwritten by the latest data.
(5) Calibration history
Records data when the calibration is performed.
The history records the calibration time, concentration values before and after the calibration, as well as the
calibration error.
Up to 100 latest calibration data are recorded.
After the number of recorded data reaches 100, the oldest data will be overwritten by the latest data.
NOTE
 The data logger function of this gas monitor is entirely based on the overwriting system (the oldest
data is deleted and the latest data is recorded).
 The recorded data can be read out by the "Data Logger Management Program" (optional). See the
operating manual of "Data Logger Management Program" for more information.
- 73 -
11. Appendix
11-3. Gas alarm (optional function)
11-3. Gas alarm (optional function)
Normally the gas alarm function is set to OFF and unavailable (optional function). To use this function,
please contact RIKEN KEIKI.
Gas alarm: Triggered when the concentration of detected gas reaches or exceeds the alarm setpoint value.
(Self-latching)
Alarm display: Notifies users of an alarm by blinking the concentration display of the subject gas, sounding
the buzzer and lighting the lamp.
Alarm types: First alarm (WARNING), second alarm (ALARM) and OVER alarm
<List of Gas Alarms>
Gas alarm type
Sounding buzzer
Blinking alarm LED
arrays
First alarm
Repeatedly sounds
strong and weak beeps
at about 1-second
intervals.
"Beep, beep"
Repeatedly blinks at
about 1-second intervals.
Vibration
LCD display
Blinks the gas
concentration and
WARNING displays.
Second alarm
Repeatedly sounds
strong and weak beeps at
about 0.5 second
intervals:
"Beep, beep, beep, beep"
Repeatedly blinks at
about 0.5-second
intervals.
Vibrate at an alarm state.
Blinks the gas
concentration and
ALARM displays.
- 74 -
OVER alarm
Repeatedly sounds
strong and weak beeps at
about 0.5 second
intervals:
"Beep, beep, beep, beep"
Repeatedly blinks at
about 0.5-second
intervals.
Blinks the gas
concentration and OVER
displays.
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