PT2E-2658

Indoor Carbon Dioxide Monitor

RI-600Operating ManualContents
1. Outline of the Product..................................................................................................................................... 3
Preface ............................................................................................................................................................ 3
Purpose of use ................................................................................................................................................ 3
Definition of DANGER, WARNING, CAUTION and NOTE ............................................................................ 4
Method of confirmation for CE/UKCA marking type ....................................................................................... 4
2. Important Notices on Safety ........................................................................................................................... 5
2-1. Danger cases........................................................................................................................................... 5
2-2. Warning cases ......................................................................................................................................... 6
2-3. Precautions .............................................................................................................................................. 6
3. Product Components ...................................................................................................................................... 7
3-1. Main unit and standard accessories ........................................................................................................ 7
3-2. Names and functions for each part ......................................................................................................... 9
4. How to Install ................................................................................................................................................ 11
4-1. Precautions for installation points ......................................................................................................... 11
4-2. Precautions for system designing ......................................................................................................... 12
4-3. Installation of main unit .......................................................................................................................... 14
4-4. Precautions for wiring ............................................................................................................................ 16
5. How to Use ................................................................................................................................................... 19
5-1. Before using the monitor ....................................................................................................................... 19
5-2. Preparation for start-up ......................................................................................................................... 19
5-3. Basic operating procedures................................................................................................................... 20
5-4. Power-on ............................................................................................................................................... 21
5-5. Modes .................................................................................................................................................... 22
5-6. User mode ............................................................................................................................................. 23
5-7. Power-off ............................................................................................................................................... 25
6. Alarm Activation and Functions .................................................................................................................... 26
6-1. Gas alarm activation .............................................................................................................................. 26
6-2. Fault alarm activation ............................................................................................................................ 27
6-3. External output operation ...................................................................................................................... 27
7. Maintenance ................................................................................................................................................. 28
7-1. Maintenance intervals and items ........................................................................................................... 28
7-2. Maintenance (regular maintenance) mode ........................................................................................... 29
8. Storage and Disposal ................................................................................................................................... 44
8-1. Procedures to store the monitor or leave it for a long time ................................................................... 44
8-2. Procedures to relocate the monitor or use it again ............................................................................... 44
8-3. Disposal of products .............................................................................................................................. 44
9. Troubleshooting ............................................................................................................................................ 45
10. Product Specifications ................................................................................................................................ 47
10-1. List of specifications ............................................................................................................................ 47
11. Appendix ..................................................................................................................................................... 48
11-1. Detection principle of Non-Dispersive Infrared Ray ............................................................................ 48
11-2. Definition of terms ................................................................................................................................ 48

2

1. Outline of the ProductPreface11.

Outline of the ProductPrefaceThank you for choosing our indoor carbon dinoxide monitor RI-600 (hereinafter referred to as the monitor).
Please check that the model number of the product you purchased is included in the specifications on thismanual.
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 monitor must read and understand the operating manual anduse this product as described in this manual.
Note that the contents of this manual are subject to change without notice for product improvement. It isalso prohibited to copy or reproduce this manual, in whole or in part, without permission.
Regardless of warranty period, we shall not make any indemnification for accidents and damage caused byusing the monitor.
Make sure to read the warranty policy specified on the warranty.

Purpose of use
This carbon dioxide monitor measures carbon dioxide in the air. While displaying measured carbon dioxide
concentration on the LCD, the monitor converts it to an analog signal of 4 - 20 mA to output and outputs a
gas contact to ventilate the room at a gas alarm state which carbon dioxide concentration rises over preset
concentration (alarm setpoint).
The monitor is a safety unit, not an analyzer which performs quantitative/qualitative analysis/measurement
for gas. Check the specifications before use and conduct measurement properly in accordance withpurposes.

3

1. Outline of the ProductDefinition of DANGER, WARNING, CAUTION and NOTE

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.

Method of confirmation for CE/UKCA marking type
The CE/UKCA marking is labeled on the detector in case of comply with CE/UKCA mark. Please confirm
the instrument specification before using. Please refer Declaration of Conformity that is at the end of thismanual if you have CE/UKCA marking type.
You can confirm instrument specification to see the CE/UKCA mark as follows.

CE/UKCA mark

CE/UKCA mark label (Bottom of instrument)(DC specification only)42. Important Notices on Safety

2-1. Danger cases

22.

Important Notices on
SafetyTo maintain the performance of the monitor and use it safely, observe the following instructions withWARNING and CAUTION.

WARNING If an abnormality is found in the monitor, contact RIKEN KEIKI immediately. Visit our Web site tofind your nearest RIKEN KEIKI office.
Web site: https://www.rikenkeiki.co.jp/

2-1. Danger cases
DANGER
 This is not an explosion-proof unit. Never attempt to measure a gas in an atmosphere over the
lower explosive limit.

52. Important Notices on Safety

2-2. Warning cases

2-2. Warning cases
WARNING Before turning on the monitor, always check that the voltage is compliant with the specifications.
Operating on an unstable power supply may cause malfunctions.
 Do not operate this monitor in a place where combustible/explosive gases or vapors are present.
Operating the monitor in such an environment will lead to extreme dangers.
 Perform span adjustment at fixed intervals.
 Do not run the power cable and remote sensor cable of the monitor in parallel with cables ofhigh-frequency or high-voltage and other device's power cables. It may cause malfunctions.
 If a cable of high-frequency or high-voltage and the power cable need to intersect with each other,it should be orthogonally connected.
 When wiring, be careful not to apply any stresses on the cables by pulling, tightening or twisting,etc.
 Do not disassemble/modify the monitor. It may invalidate the warranty of the performance.
Changing the settings without understanding them may cause alarm malfunctions. Please use themonitor properly in accordance with the operating manual.
 Do not use the monitor with it attached to a control device, equipment, etc.

2-3. Precautions
CAUTION Do not use a device, such as a transceiver, which transmits a radio wave near the monitor or its
cables. It may affect the measurement. If a transceiver or other radio wave transmitting device isused, it must be used in a place away from the monitor where it disturbs nothing.
 Restarting the monitor within five seconds after turning it off may cause errors.
 This is not a control unit. It is not allowed to use the external output of the monitor to control otherunits.
 This is a safety unit. Never fail to perform a regular maintenance to ensure safety. Continuing to use
the monitor without performing maintenance will compromise the sensitivity of the sensor, thus
resulting in inaccurate gas detection.
 Do not pick the sensor or buzzer opening with a sharp-pointed item. The unit may cause
malfunction or get damaged, possibly resulting in incorrect measurements.
 Do not let the monitor draw in water. Do not also install the monitor in a place where the monitor
may get wet. Ignoring this may cause malfunction because the monitor is not water- and drip-proof.
 This is a precision device. Do not give strong shock or vibration to the monitor.
 When the case is opened for wiring or other operation, do not touch inner parts. When wiring, besure that excessive pressure is not applied to the power cable and remote sensor cable.
 Do not block the vent for the sensor.

6

3. Product Components

3-1. Main unit and standard accessories

3
3.

Product Components

3-1. Main unit and standard accessories
After opening the carton box, check the monitor and accessories.
If there is anything missing, contact RIKEN KEIKI.

Main unit
For names and functions of individual parts of the monitor and LCD display, see "3-2. Names and functions
for each part" (P.9).
RI-600 main unit

Sensor unit (Remote type)NOTE

 Which type to use - sensor integrated type or sensor unit supplied type (remote type) - can be orderedat the time of purchase.
 The sensor integrated type does not include the sensor unit (remote type).
 The cable length for the remote type can be selected from 3, 5, 10 and 20 m.
 The remote type can be selected only 0-2vol%/0-5vol%.

7

3. Product Components

3-1. Main unit and standard accessories

Standard accessories- Cross-recessed pan headmachine screw (2 pcs.)- Cross-recessed round headwood screw (2 pcs.)- 3.2 m AC power cable (1 pc.) *Supplied only with AC
specification- Operating manual (1 pc.)

CAUTION The main unit and sensor unit (remote type) are precision devices. Be careful not to drop themonitor when installing or uninstalling the main unit or sensor unit. Dropping the monitor may
compromise its original performance or cause malfunctions.

Optional accessories- Installation board (1 pc.)
- Gas calibration cap (1 pc.)

Outline drawing
Power switch

Cable outlet

Display

Cable outlet

Cable outlet

Sensorpart(Unit: mm)

Cable outlet

Main unit
Mounting hole for
3-M3
Use one of the twofor lower holes

To main unit

To main unit

Remote sensor

8

To main unit

3. Product Components

3-2. Names and functions for each part3-2. Names and functions for each part
This section describes the names and functions of the individual parts and LCD display that make up themonitor.

Main unit

Name

Major function
Turns the power ON/OFF. Slide the switch up to power on and down
to power off.
Hold down this button to enter the user mode.
It is also used to cancel or skip during setup.

(1)

Power switch(2)

MODE button(3)

˄ button

Used to change the screen and increase numerical values during
setup.

(4)

˅ button

Used to change the screen and decrease numerical values during
setup.

(5)

SET button

Used to confirm the setting.

(6)
(7)

Buzzer sound opening
Sensor part

Emits operation and judgment sounds. (Do not block it.)
Detects a gas to be detected. The sensor is inside the cover.

(8)

Screw

Loosen this screw to open the case.

93. Product Components

3-2. Names and functions for each part

Display(1)

NameOperating state display

Major function
Displays the operating status. Blinks at a normal state.

(2)

1st alarm display

Lights up or flash in orange at a first alarm state.

(3)

2nd alarm display

Lights up or flash in red at a second alarm state.

(4)

Fault alarm display
Concentration value
display
Maintenance indicator
Unit display

Lights up in red at a fault alarm state.

Displays the unit (ppm/vol%) according to the specification.

(7)

Gas name display
Maintenance display

Displays the gas name.
Maintenance items and others are displayed during setup.

(8)

AC/DC power display

Lights up when the monitor is operating on AC or DC power.

(9)
(10)

This is not used for the monitor.
This is not used for the monitor.

(5)
(6)

Displays the gas concentration.
Maintenance items and others are displayed during setup.

10

4. How to Install

4-1. Precautions for installation points

44.

How to Install

4-1. Precautions for installation points
When installing the monitor, never fail to observe the following precautions.
Ignoring the precautions may damage the monitor, resulting in inaccurate gas detection.

CAUTION This is a precision device. Because the monitor may not provide the specified performance in someplaces (environments), check the environment in the installation site, and then take appropriate
actions if necessary. Because the monitor plays an important role for safety and disasterprevention, it must be installed in appropriate points.
 Do not install this product in any of the following locations.
- Place exposed to direct sunlight or outside- Place exposed to water- Place exposed to ventilation from an air conditioner, etc.
- Place exposed to soot, smoke or steam- Place where the temperature drops below 0ºC or rises over 40ºC or the temperature changes
suddenly- Place with high humidity like a bathroom- Place with bad ventilation such as behind a curtain or under the shadow.

<Do not install the monitor in a place with vibrations or shocks.>
The monitor consists of sensitive electronic parts. The monitor must be installed
in a stable place without vibrations or shocks, etc. and it cannot drop.

<Do not install the monitor in a place exposed to water, oil orchemicals, etc.>
When selecting installation points, avoid a place where the monitor is exposed toliquids such as water, oil, or chemicals.

<Do not install the monitor in a place where the temperaturedrops below 0ºC or rises over 40ºC.>
The operating temperature of the monitor is 0 to +40ºC. Install the monitor in astable place not exceeding the operating temperature range.

<Do not install the monitor in a place exposed to direct sunlightor sudden changes in the temperature.>
Avoid a place where the monitor is exposed to direct sunlight or radiant heat
(infrared rays emitted from a high-temperature object), and where the unit
temperature changes suddenly. Condensation may be formed inside themonitor, or the monitor cannot adjust to sudden changes in the temperature.
11

4. How to Install

4-2. Precautions for system designing<Keep the monitor (and its cables) away from noise source
devices.>
When selecting installation points, avoid a place where
high-frequency/high-voltage devices exist.

<Do not install the monitor in a place where maintenance of the monitor cannot
be performed or where handling the monitor involves dangers.>
Regular maintenance of the monitor must be performed.
Do not install the monitor in a place where the machinery must be stopped when maintenance isperformed in its inside, where parts of the machinery must be removed to perform maintenance, orwhere the monitor cannot be removed because racks or other things prevent access to it. Do notinstall the monitor in a place where maintenance involves dangers, for example, near a high-voltage
cable.

4-2. Precautions for system designing
Note the following precautions for system designing of the monitor.

CAUTION An unstable power supply and noise may cause malfunctions or false alarms.

Using a stable power supply
The external output and alarm contact of the monitor may be activated when the power is turned on, whenmomentary blackout occurs, or when the system is being stabilized. In such cases, use a UPS(uninterruptible power system), or take appropriate actions on the receiving side.
The monitor must be provided with the following power supply.
Power supply
voltageAllowed time of
momentary
blackout

Others100 - 120 VAC ±10% (50/60 Hz) or 24 VDC±10%
Up to 10 milliseconds(To recover from the momentary blackout for 10 milliseconds or more, restart themonitor.)
Example of actions
To ensure continuous operation and activation, install a UPS (uninterruptible
power system), etc. outside the monitor.
Do not use it with a power supply of large power load or high-frequency noise.
Example of actions
Use a line filter, etc. to avoid the noise source if necessary.

124. How to Install

4-2. Precautions for system designing

Proper use of alarm contact
The alarm contact of the monitor is used to transmit signals to activate an air-conditioning control.

CAUTION The b contact (break contact) under de-energized state may be opened momentarily by a physicalshock, such as external force.
When the b contact is selected for the alarm contact, take appropriate actions to prepare for a
momentary activation, for example, add signal delay operation (approximately one second) to thereceiving side of the b contact.
The specifications for the external output gas alarm contact of the monitor are based on the resistance loadconditions. If inductive load is used at the alarm contact, the following errors will occur easily because
counter electromotive force is generated at the contact.
- Deposition, defective insulation or defective contact at the relay contact- Damage of any electric parts due to high-voltage generated inside the monitor- Abnormal operations by an out-of-control CPU
If load is to be activated, appropriate measures must be taken to stabilize the operation of the monitor andprotect the alarm contact referring to the following information.
- Relay it with an external relay at a lower voltage of 100 VAC or below (contact amplification). At the sametime, the surge absorbing part SK1 suitable for the specifications must be attached to the external relay.
- In addition, the surge absorbing part SK2 must be attached to the loaded side of the external relay ifnecessary.
- It may be recommended that the surge absorbing part should be attached to the contact for certain loadconditions. It must be attached to an appropriate position by checking how the load is activated.
RI-600Load

CoilAlarm contact

PowersupplyPowersupplyExternal relay(Lower voltage relay)*SK1, SK2: Surge absorbing part

CAUTION In principle, do not activate inductive load at the alarm contact of the monitor. In particular, never
use the inductive load to activate a fluorescent lamp or motor, etc.
 If inductive load is activated, relay it with an external relay (contact amplification). However,
because the coil of an external relay also involves inductive load, select a relay at a lower voltage(100 VAC or below), and then protect the contact of the monitor with an appropriate surge
absorbing part, such as a CR circuit.

13

4. How to Install

4-3. Installation of main unit

4-3. Installation of main unit
Install the main unit on the wall 50 to 180 cm up from the floor.
If wall screws are available, remove the screw at the lower part of the main unit to open the cover andinstall the unit using the mounting holes on the back of the unit.

CAUTION Install the sensor in a place not directly exposed to ventilation from an air conditioner.
 Sudden changes in the temperature may cause the readings not to come back.

Cable outlet

Mounting hole (for M4
screw)*Supporting the switch
box

NOTE

 To install the main unit to the wall with screws, use the mounting holes on the back of the unit
according to the following procedure.
(1) Loosen the screw at the lower part of the main unit and open the surface cover of the case.
(2) Push the both sides of the monitor until it clicked.
(3) Open the surface cover.
(4) Fix the main unit with two screws (M4) through the mounting holes.
(5) Put the surface cover back on the case and tighten the screw at the lower part of the main unit.
3

2

1
4

14

4. How to Install

4-3. Installation of main unit

<Installation of Remote Sensor>
Tighten the screws through one upper mounting hole and one of the two lower mounting holes.
Mounting hole for 3-M3
Use one of the two for lower holes

To main unit

NOTE

 To install the remote sensor to the wall using screws, use the mounting holes on the back of thesensor according to the following procedure.
(1) Open the surface cover of the remote sensor.
(2) Fix the sensor with two screws (M3) through the mounting holes (one upper mounting hole andone of the two lower mounting holes).
(3) Put the cover back on the remote sensor.

<Maintenance Space>
If the installation board (option) is used, secure an installation space above the unit so that it can beinstalled by sliding.

Secure as
installation space

Installation dimension drawing (Installation board not used)
Compatible with JIS single switch box

Installation dimension drawing (Installation board used)15

4. How to Install

4-4. Precautions for wiring

4-4. Precautions for wiring
If the monitor operates on AC or DC power, or inductive load is used at the alarm contact, wiring work is
required.
The following cables are recommended for wiring the monitor with the power supply, signal cable andcontact.

<Recommended Cables>
For AC power
For DC power
For signal cable (4 - 20 mA/0 - 1 V)
For contact

Solid wire/stranded wire: 0.2 - 1.5 mm2
CVVS: 0.2 - 1.5 mm2
CVVS: 0.2 - 1.5 mm2
Cable such as CVV (0.2 - 1.5 mm2) Up to 4 cores

CAUTION Be careful not to damage the internal electronic circuit when wiring. In addition, be careful not toapply stresses on the monitor when (overweight) cables are installed.
 The power and signal cables must be wired separately from the motor power cables.
 When stranded wires are used, prevent wires from contacting each other.

<Cable Connection Conditions>
Connectable cable, bare wire length and connection tools are as follows:- Cable: 0.2 - 1.5 mm2- Bare wire length: 10 - 11 mm- Connecting tools: Dedicated screwdrivers manufactured by WAGO and equivalent (edge width 3.0 to 4.5mm x 0.5 mm)

CAUTION
The specified bare wire length must be observed when the wire insulation is peeled off.
 Improper clamping of the wire due to a shorter bare wire length may cause defective electric
conduction or heating.
 Catching the wire insulation due to a shorter bare wire length may cause defective electric
conduction or heating.
 Exposing the wire due to a longer bare wire length may cause defective insulation or a short circuit.
 Be careful not to break up the wire. If the wire is broken up when inserted to the terminal, this may
cause defective insulation or heating.

<Compatible Bar Terminal>
For a bar terminal, the following items are available.
- Bar terminal (ferrule): Model 216 Series (manufactured by WAGO)- Crimping tool: Model VarioCrimp 4 (206-204) (manufactured by WAGO)

CAUTION A bar terminal of the specified model must be used. Using other bar terminals invalidates thewarranty of the performance.

16

4. How to Install

4-4. Precautions for wiring

How to connect to terminal plate
When cables (wires) are connected to the terminal plate inside the main unit, use the dedicatedscrewdriver or a compatible flathead screwdriver.
When connecting a stranded wire, be sure to press the push button and open the spring while connecting
the wire.

1

Push the push button
straight downward using
the compatible screwdriveror equivalent to open thespring.

2

Insert a wire with a
specified bare wire length(10 mm) until the end of itreaches the deepest point.

3

Release the screwdriver.
The wire is connected.

CAUTION Never fail to use the correct tool.
 Do not insert more than one wire into one wiring hole. If the total size (mm2) of two or more wires iswithin the maximum wire connection range of the terminal plate, it may cause reduced spring clamping
force, defective insulation due to clogged wire sheath, defective contact or coming off of wires.

NOTE<Compatible Screwdriver>
When opening the spring, use the compatible screwdriver manufactured by WAGO or equivalent (ascrewdriver with an edge width of 3.0 to 4.5 mm x 0.5 mm which can fully open the spring: See the tablebelow). In doing this work, be careful not to apply excessive force. Ignoring this may damage thehousing/push buttons or cause dropping off of the push buttons.
Compatible screwdriver manufactured by WAGO
Screwdriver (M) straight type
Screwdriver (M) straight type (short shaft & grip)
Screwdriver (M) straight type (insulated shaft type)17

210-120J
210-350/01
210-657
210-720

4. How to Install

4-4. Precautions for wiring

Figure of terminal plate
The overview of the terminal plate inside the main unit is as follows:
For contact (TN3)
1 - 2: ALM1 (First)
3 - 4: ALM2 (Second)

For external output signal(4 - 20 mA/0 - 1 V) (TN2)
1: (+)
2: (-)<For Connecting AC Power>
AC power (TND)
100 - 120 VAC ± 10% (50 Hz/60 Hz)
1: L
2: N
3: Not used

Terminal board for AC power<For Connecting DC Power>
DC power (TND)
24 VDC ± 10%
1: (+)
2: (-)
3: N.C

Terminal board for DC power18

5. How to Use

5-1. Before using the monitor

55.

How to Use

5-1. Before using the monitor
Not only the first-time users but also the users who have already used the monitor must follow theoperating precautions.
Ignoring the precautions may damage the monitor, resulting in inaccurate gas detection.

CAUTION After you received the monitor, start using the monitor within the specified operation start limit of
its sensor.

5-2. Preparation for start-up
Check the following points before starting carbon dioxide concentration monitoring.
- Before turning on the power, check that the monitor is installed properly and the external wiring is done
properly.
- Check that the power supply voltage is compliant with the specifications.
- Because the external contact may be activated during the adjustment, take measures to prevent anactivated contact from having influences on external circuits.

19

5. How to Use

5-3. Basic operating procedures

5-3. Basic operating procedures
Normally, the detection mode is activated after the power is turned on.
<Detection Mode>
The monitor is restarted
after recovering from fault.

ＣＯ2(long pressing)<Gas Alarm Status><Maintenance Mode>

ＣＯ2<Maintenance Mode (regular maintenance mode)><Fault Alarm Status>

ＣＯ2(long pressing)

WARNING When the monitor enters each mode from the detection mode while an alarm is activated, the alarm
contact is released.

20

5. How to Use

5-4. Power-on

5-4. Power-on- Before turning on the power switch, check that the monitor is installed properly.
- Slide the power switch up to power on and down to power off.
- Turn on the power switch.
- After the monitor completes the start-up, it enters the detection mode.

ON
Power switch

OFF<Start-up Procedures (approximately 25 seconds for system check of the monitor and alarmdeactivation)>
Power On▼▼▼
Initial clear(approx. 25 seconds)▼▼▼
Detection mode

During initial clear
External output
4 - 20 mA: About 2.5 mA fixed
0 - 1 V: About 0 V fixed

ＣＯ2

CAUTION Do not turn off the monitor during the initial clear. When turning it on again, abnormal operation may
occur.
 After initial clear, perform calibration.
 In a normal air release environment, CO2 concentration is hundeds of ppm. Since the readings is
not zero even in the normal state, attention is paid.
 When there are many people, and ventilation is insufficient, setting environment, please be careful
because CO2 concentration may exceed 1000ppm(0.1vol%).

21

5. How to Use

5-5. Modes

5-5. Modes
Mode
Detection
mode

Item

LCD display
Gas
concentration
Gas name
1-0 VER

Indicate the program version.

1-1 AIR

Not used.

Setting display

1-2 CONF

Show the typical settings.
1-20: First Alarm Setpoint (ALM1)
1-21: Second Alarm Setpoint (ALM2)
1-22: Alarm Delay Time (DELY)
1-23: Zero Suppression Value (SUPP)
1-24: Not used (----)
1-26: Not used (----)
1-27: Alarm Summary (AL-S)

Regularmaintenancemode switching

1-3 MMOD

Switch to the regular maintenance mode.

－
Version display
Fresh airadjustment

Maintenancemode(User)

Gas introduction
display
Zero adjustment
Span adjustment
Zero/span
initialization

Maintenancemode(Regularmaintenance)

Environmental
setting

Display

Factory modeswitchingUser modeswitching

Details
Normal state2-1 ZERO
2-2 SPAN

2-00: Gas Test (GAS)
2-01: Alarm Test (ALM)
2-02: Fault Alarm Test (FALT)
2-03: Display Test (LCD)
2-04: Not used (----)
Perform the zero adjustment.
Perform the span adjustment.

2-3 SDEF

Not used.

2-4 SET

2-40: Not used (----)
2-41: Not used (----)
2-42: Alarm Value Setting (AL-P)
2-43: Alarm Delay Time Setting (AL-D)
2-44: Alarm Pattern Setting (AL-T)
2-45: Zero Suppression Type Setting (SP-T)
2-46: Zero Suppression Value Setting (SAPP)
2-47: Not used (----)
2-48: External Output Adjustment (MA20)
2-49: Not used (----)
2-4A: Date/Time Setting (DATE)
2-4b: Not used (----)
2-4C: Not used (----)
2-4d: Buzzer ON/OFF Setting (BZZR)
2-4E: Gas Alarm Contact ON/OFF (AL-R)
2-4F: External Output Signal ON/OFF (MA-O)
2-4H: LCD Backlight ON/OFF (LCD)

2-5 DISP

2-50： Not used (----)
2-51： Not used (----)
2-52： Calibration Curve Number Display (GSEL)
2-53： Fault Detail Display (FALT)
2-54： Not used (----)

2-6 FMOD

Not used.

2-7 UMOD

Return to the user mode.

2-0 TEST22

5. How to Use

5-6. User mode

5-6. User mode
WARNING After adjustment is completed, never fail to press the MODE button to return to the detection mode.
(If the monitor remains in the user mode, it automatically returns to the detection mode in ten
hours.)

Detection mode
Press the MODE
button for threeseconds.

ＣＯ2

User mode
1-0. VER
Indicate the program
version.

1-1. AIR
Not used.

1-2. CONF
Display various setting
values.

1-3. MMOD
Switch to the regular
maintenance mode.

23

5. How to Use

5-6. User mode

<Setting Display "1-2">This is used to check the setting of typical menus.
1-2. CONF
Press the SET button.

First Alarm Setpoint
Display
Press the SET button
to display the firstalarm setpoint.

Second Alarm
Setpoint Display

Alarm Delay Time
Display (seconds)

Zero Suppression
Value Display

24

5. How to Use

5-7. Power-off

Zero Follower
ON/OFF Display
Not used.

Air Pressure
Correction ON/OFF
Display
Not used.

Alarm Summary

5-7. Power-off
Slide the power switch down to power off.
After turning off the power switch of the monitor, turn off the power supply (100 VAC or 24 VDC) of themonitor.

CAUTION When the monitor is turned off, an alarm may be triggered on the upper (central) system.
Before turning off the monitor, the inhibit (point skip) on the upper (central) system must be
activated.
Decide whether the power can be turned off by checking the operation of the devices connected tothe external output or external contact output terminal of the monitor.

25

6. Alarm Activation and Functions

6-1. Gas alarm activation

6
6.

Alarm Activation andFunctions6-1. Gas alarm activation
A gas alarm is activated when detected gas concentration reaches the preset alarm setpoint.

NOTE The alarm setpoint (first alarm and second alarm) is factory-set. The setting values can be changed in
the maintenance mode (P.29).
 Although the alarm delay time (standard: 2 seconds) works in the monitor to prevent a false activation,
it can be cancelled in the maintenance mode (P.29) if not needed.

Display operation<Concentration Display>
In case of over the detection range (Over Scale), "∩∩∩∩" is displayed on the LCD.
<During Power-on>
The LCD is continuously displayed.
<Alarm Display (ALM1: Yellow Backlight), (ALM2: Red Backlight)>
The alarm consists of two steps. The yellow or red backlight lights up when the respective alarm setpointvalue is reached to or exceeded.(Default: Backlight is off)

Contact activation
When gas concentration reach or is above the alarm setpoint value, the contact is activated and after thegas concentration fall down below the alarm setpoint value, the contact activation is reset automatically.
In case of measuring range : 0-2000ppm/0-5000ppm/0-10000ppm specification, hysteresis of 50ppm isprovided.

alarm setpoint value

1000ppm

Hysteresis

950ppm

50ppm

Contact activation

26

6. Alarm Activation and Functions

6-2. Fault alarm activation

6-2. Fault alarm activation
A fault alarm is triggered when an abnormality is detected in the monitor. After a fault alarm is triggered,
FAULT is displayed and the backlight (red) lights up on the LCD. (An error message is displayed on the
LCD. Determine the causes and take appropriate actions.)
After the monitor is successfully returned from the fault, it restarts with the process normally performed
right after it is turned on (initial clear).
If the monitor has problems and is repeatedly malfunctioning, contact RIKEN KEIKI immediately.

NOTE

 For information on malfunctions (error messages), see "Troubleshooting" (P.45).

6-3. External output operation
The monitor outputs an analog signal of 4 - 20 mA according to CO2 concentration display on the LCD
Gas concentration VS External output
Scale over
(Display：∩∩∩∩）

External output
22mA
20mA

4～20mA

NormalMaintenance
4mA
2.5mA
Gas concentration0

Full scale< 4 - 20 mA Output Table>

InitialExternal output(4 - 20 mA)
2.5mA

Normal

4.0～20.0mA

Scale overTroubleMaintenance mode menu
Air calibration
Alarm setpoint check
Alarm summary check
Date/time check and setting

22mA
0.5mA
2.5mA
2.5mA
2.5mA
2.5mA
2.5mA

Fixed values
Depending on gas
concentration
Fixed values
Fixed values
Fixed values
Fixed values
Fixed values
Fixed values
Fixed values

Alarm test

4.0～20.0 mA

Depending on test value

Status27

Remarks

7. Maintenance7-1. Maintenance intervals and items

7
7.

Maintenance

The monitor is an important instrument for the purpose of safety.
To maintain the performance of the monitor and improve the reliability of safety, perform a regular
maintenance.

7-1. Maintenance intervals and items
This is a safety unit. Never fail to perform daily and regular maintenance before use.
・ Daily maintenance: Perform maintenance before commencing each work.
･ Regular maintenance: Perform maintenance once or more for every six months to maintain theperformance as a safety unit.
Maintenance
itemPower supply
check
Concentration
display check

Alarm test
Span
Adjustment
Gas alarm
check

Maintenance content

Daily
maintenanceRegularmaintenance









－



－



－



Check that the LCD display lights up.
Check that the concentration display value does not
become the abnormal concentration or abnormal
variation.
*The CO2 concentration is also present in thehundeds of ppm under the general air environment.
Inspect the alarm circuit by using the alarm test
function.
Perform span adjustment using a calibration gas.
Check the gas alarm using a calibration gas.

WARNING If an abnormality is found in the monitor, contact RIKEN KEIKI immediately.

28

7. Maintenance7-2. Maintenance (regular maintenance) mode

About maintenance services
We provide services on regular maintenance including such as span adjustment, other adjustments andmaintenance.
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, knowledge, etc. on the dedicated tools used for services,along with other products.
To maintain the safety operation of the monitor, please use our maintenance service.
Typical maintenance services are listed as follows. For details, please contact RIKEN KEIKI.

<Typical Maintenance Services>
Item
Power supply
check
Concentration
display check
Alarm test
Span adjustment
Gas alarm check
Cleaning andrepair of the unit
Unit operation
check
Replacement ofconsumableparts

Services
Checks the power supply voltage.
Checks that the LCD display lights up.
(Verifies that relevant points can be identified on the system.)
Check that the concentration display value does not become the abnormal
concentration or abnormal variation.
*The CO2 concentration is also present in the hundeds of ppm under the general air
environment.
Inspects the alarm circuit by using the alarm test function.
Checks the alarm display (Checks the activation each for ALM1 and ALM2.)
Performs span adjustment using a calibration gas.
Checks the gas alarm by using the calibration gas.
Checks the alarm. (Checks triggering of alarm when the alarm setpoint is reached.)
Checks dust or damage on the surface, cover or internal parts of the unit, andcleans or repairs such parts as needed.
(Visual diagnosis) 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.

7-2. Maintenance (regular maintenance) mode
The maintenance mode allows for checking the status of the monitor and adjusting and changing thesettings.

WARNING When the adjustment is completed, press the MODE button to return to the measuring state.
The monitor automatically returns to the measuring state in 10 hours.

29

7. Maintenance

Mode
Maintenancemode(Regularmaintenance)

7-2. Maintenance (regular maintenance) mode

Item
Gas introduction
display

LCD display
2-0 GAS TEST

Zero adjustment
Span adjustment
Zero/span
initialization
Environmental
setting

2-1 ZERO
2-2 SPAN
2-3 SDEF
2-4 SET

2-40: Not used (----)
2-41: Not used (----)
2-42: Alarm Value Setting (AL-P)
2-43: Alarm Delay Time Setting (AL-D)
2-44: Not used (----)
2-45: Zero Suppression Type Setting (SP-T)
2-46: Zero Suppression Value Setting (SAPP)
2-47: Not used (----)
2-48: External Output Adjustment (MA20)
2-49: Not used (----)
2-4A: Date/Time Setting (DATE)
2-4b: Not used (----)
2-4C: Not used (----)
2-4d: Buzzer ON/OFF Setting (BZZR)
2-4E: Gas Alarm Contact ON/OFF (AL-R)
2-4F: External Output Signal ON/OFF
2-4H: LCD Backlight ON/OFF (LCD)

Display

2-5 DISP

2-50：Not used (----)
2-51：Not used (----)
2-52：Calibration Curve Number Display (GSEL)
2-53：Fault Detail Display (FALT)
2-54：Not used (----)

Factory modeswitchingUser modeswitching

2-6 F MODE

Not used.

2-7 U MODE

Return to the user mode.

30

Details
2-00: Gas Test
2-01: Alarm Test
2-02: Fault Alarm Test
2-03: Display test
2-04: Not used (----)
Perform the zero adjustment.
Perform the span adjustment.
Not used.

7. Maintenance7-2. Maintenance (regular maintenance) mode

<Regular Maintenance Mode>

User mode

Press the SET buttonin "1-3. M MOD".

Then press the SET
button again for threeseconds.

(long pressing)

2-0. GAS TEST
Perform a test with thegas.
Similar to the detection
condition,the readingchanges and an alarmis displayed after gas
is introduced, but the“ALM1” and “ALM2” donot flash and thecontact is not
activated.
2-1. ZERO
Perform the zeroadjustment.

2-2. SPAN
Perform the span
adjustment.

31

7. Maintenance7-2. Maintenance (regular maintenance) mode

2-3. SDEF
Not used.

2-4. SETSpecify various
settings.

2-5. DISP
Provide various detaildisplays.

2-6. F MODE
Not used.

2-7. U MODE
Return to the user
mode.

32

7. Maintenance7-2. Maintenance (regular maintenance) mode

<Gas Introduction Display>2-0. GAS TEST
Perform a test with thegas.
Similar to the detectionmode, the readingchanges and an alarmis displayed after thegas is introduced, but
the contact is not
activated.
2-00. GAS
Perform the gas test.

2-01. ALM
Perform the alarm test.
Use the ˄ button toincrease the display
value to the alarm
setpoint to trigger an
alarm.

2-02. FALT
Conduct a fault alarmtest.
Use the ˄ or ˅ button
to enable the function
to trigger an alarm.

33

7. Maintenance7-2. Maintenance (regular maintenance) mode

2-03. LCD
Perform the LCD
display test.

2-04.
Not used.

To 2-00

34

7. Maintenance7-2. Maintenance (regular maintenance) mode

<Zero Adjustment>
2-1. ZERO
Perform the zeroadjustment.

The current
concentration isdisplayed.

Supply zeroadjustment gas to thesensor.

Press the SET button.

"PASS" is displayedwhen adjustment iscompleted, and "FAIL"
is displayed when it
fails.

Zero adjustment will
end.

35

7. Maintenance7-2. Maintenance (regular maintenance) mode

<Span Adjustment>
2-2. SPAN
Perform the span
adjustment.

The current
concentration isdisplayed.

Use the ˄ or ˅ button
to adjust the reading to
the span adjustment
gas concentration andpress the SET button.

"PASS" is displayedwhen adjustment iscompleted, and "FAIL"
is displayed when it
fails.

Span adjustment will
end.

36

7. Maintenance7-2. Maintenance (regular maintenance) mode

<Environmental Setting>
2-4. SETSpecify various
settings.

2-40.
Not used.

2-41.
Not used.

2-42. AL-P
Set the alarm setpoint(first, second).
Use the ˄ or ˅ button
to set the alarm
setpoint and press theSET button to confirm
it.

37

7. Maintenance7-2. Maintenance (regular maintenance) mode

2-43. AL-D
Set the alarm delay
time (seconds).
Use the ˄ or ˅ button
to set the time(seconds) and press
the SET button toconfirm it.
2-44. AL-T
Not used.

2-45. SP-T
Not used.

2-46. SAPPS Not used.

38

7. Maintenance7-2. Maintenance (regular maintenance) mode

2-47.
Not used.

2-48. MA20
Adjust the external
output (4 mA, 20 mA).
Connect an ammeter.
Then, use the ˄ or ˅
button to select thevalue and press theSET button to confirm
it.
2-48. MA20
Adjust the external
output (4 mA, 20 mA).
Connect an ammeter.
Then, use the ˄ or ˅
button to select thevalue and press theSET button to confirm
it.

Connect an ammeter. Then, use the˄ or ˅ button to adjust output (4mA) and press the SET button toconfirm it.

Connect an ammeter. Then, use the˄ or ˅ button to adjust output (20mA) and press the SET button toconfirm it.

2-49. SSET
Not used.

39

7. Maintenance7-2. Maintenance (regular maintenance) mode

2-4A. DATE
Set the date/time.
Use the ˄ or ˅ button
to select each value inthe order of year,
month, day, hour andminute and press theSET button to confirm
it.

40

7. Maintenance7-2. Maintenance (regular maintenance) mode

2-4b. P-A
Not used.

2-4C. ACAL
Not used.

2-4d. BZZR
Set the buzzer to
ON/OFF.

41

7. Maintenance7-2. Maintenance (regular maintenance) mode

2-4E. AL-R
Set the gas alarm state
contact to ON/OFF.

2-4F. MA-O
Set the external output
signal to ON/OFF.

42

7. Maintenance7-2. Maintenance (regular maintenance) mode

2-4H. LCD
Set the LCD backlight
to ON/OFF.
*No backlight bystandard setting

43

8. Storage and Disposal

8-1. Procedures to store the monitor or leave it for a long time

88.

Storage and Disposal

8-1. Procedures to store the monitor or leave it for along time
The 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 or vapors, etc. are not present
Store the monitor in a shipping carton, if any, in which the product was delivered.
Store the monitor away from dust, etc. if the shipping carton is not available.

8-2. Procedures to relocate the monitor or use it again
When the monitor is relocated, refer to "How to Install" for relocation sites and wiring work.
The unpowered time must be minimized when the monitor is relocated.
When the monitor is used again after a long-period storage, perform a calibration.

CAUTION
 Contact RIKEN KEIKI for information on readjustment including calibration.

8-3. Disposal of products
When the monitor is disposed of, it must be treated properly as an industrial waste in accordance with thelocal regulations, etc.
Never fail to return the used sensor to RIKEN KEIKI.

44

9. Troubleshooting

9. Troubleshooting

9
9.

Troubleshooting

The Troubleshooting does not explain the causes of all the malfunctions which occur on the monitor. This
simply helps to find the causes of malfunctions which frequently occur.
If the 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.

Symptom/Display

CausesThe power switch isturned off.

Actions
Turn on the power switch.

Abnormalities/momentary
blackout of power supply
systemThe power cannot
be turned on.

Abnormaloperations
Sensorabnormalities
E-1

Systemabnormalities
E-9 SYSTEM

The reading drops
and it remains so.

The main unit is notinstalled properly.
Cable abnormalities(open circuit/not
connected/short circuit)

Check the wiring of the monitor and related devices
around it.

Fault of AC adapter

AC adapter replacement is necessary.
Please contact RIKEN KEIKI.

The connector of AC
adapter is notconnected correctly.

Connect the AC adapter correctly.
Turn off and restart the monitor.
If a symptom like this is observed frequently, takeappropriate measures to eliminate the noise.
Check that the sensor is connected and theconnectors of the sensor unit board are securely
fastened.

Disturbances by sudden
surge noise, etc.
The sensor is notconnected or improperly
connected.
Errors in communication
with the unit
The rated voltage is not
supplied to the monitor.
Abnormalities of ROM,
RAM or EEPROM inside
the monitor
Sudden change in thetemperature and CO2
concentration.

Replace the sensor unit board with a new one.
Check the power supply, and supply the rated
voltage.
Please contact RIKEN KEIKI.
Please use it in the stable environment of thechange of temperature and the CO2 concentration.
Turn off and restart the monitor.
If a symptom like this is observed frequently, takeappropriate measures to eliminate the noise.

Disturbance by noise
Span adjustment
impossible

Provide the rated voltage.
Take measures such as checking or adding the
UPS, power supply line filter and insulationtransformer.
Check whether the main unit is properly attached to
the wall-mounted unit.

Improper calibration gas
concentration

Use the proper calibration gas.

45

9. Troubleshooting
Symptom/Display

9. Troubleshooting
CausesDeteriorated sensor
sensitivity

Actions
Replace the sensor with new one.

46

10. Product Specifications

10-1. List of specifications

10
10.

Product Specifications

10-1. List of specifications
Detection principle
Gas to be detected
Concentration display*1
Detection range
Display resolution
Detection method
Alarm setpoint value

Accuracy

Non-Dispersive Infrared Ray
Carbon dioxide
LCD digital display (Five-digit, seven-segment/green, orange and red backlight)*No backlight by standard setting
0 - 2000ppm / 0 - 5000ppm / 0 - 10000ppm
0 - 2vol% / 0 - 5vol%0 - 2000ppm : 1 ppm / 2000ppm - 10000ppm:10ppm
0 - 2vol%:0.005vol% / 2 - 5vol%:0.010vol%Diffusion type0 - 2000ppm
1st : 1000ppm / 2nd : 1000ppm[standard setting]0 - 5000ppm
1st : 1000ppm / 2nd : 1000ppm[standard setting]0 - 10000ppm 1st : 1000ppm / 2nd : 1000ppm[standard setting]0 - 2vol%1st : 1.0vol% / 2nd : 1.0vol%[standard setting]0 - 5vol%1st : 2.5vol% / 2nd : 2.5vol%[standard setting]Within ±5% for full scale (to the gas concentration signal output)

Under the same test conditions

Response time

90% response (T90) within 60 seconds

Under the same test conditions

Gas alarm typeGas alarm display

Gas alarm pattern
Gas alarm contact
Fault alarm/self
diagnosis
Fault alarm display
Fault alarm patternContact capacity
Transmission
specifications
Power supply
Power consumption
Initial clear
Warm-up time
Operating temperatures
Operating humidities
Structure
External dimensions
WeightTwo-step alarm (H-HH)
First: Lights up the concentration display and backlight (orange), buzzer
Second: Lights up the concentration display and backlight (red), buzzer*No backlight and no buzzer by standard setting
Auto-reset
No-voltage contact 1a or 1b and normally de-energized (energized in response to an alarm)
System abnormalities/sensor connection abnormalities
Alarm detail display and backlight blinking (orange), buzzer*No backlight by standard setting

Auto-reset
125 VAC - 1 A or 30 VDC - 1 A (resistance load)* For CE/UKCA marking specifications, 30VDC, 1A (resistive load) only.
4 - 20 mA DC (no-insulation/load resistance under 300 Ω)
100 – 120 VAC ±10% (50/60 Hz) or 24 VDC ±10%
* For CE/UKCA marking specifications, 24VDC±10% only.
AC specification: Max. 6 VA/DC specification: Max. 4 W
Approx. 25 seconds
Approx. 30 minutes
0 - 40ºC (At a constant condition)
Below 90%RH (Non-condensing)
Wall mounting type, sensor integrated type or remote type
*Remote type is only 0-2vol%/0-5vol%.
Main unit: Approx. 80(W)x120(H)x 35.5(D)mm
Remote sensor: Approx. 40(W)x96(H)x35.5(D)mm (projection portions excluded)
AC specification: Approx. 200 g/DC specification: Approx. 180 g
Remote sensor part: Approx. 55g (cable excluded)4711. Appendix

11-1. Detection principle of Non-Dispersive Infrared Ray

1111.

Appendix11-1. Detection principle of Non-Dispersive Infrared Ray
Model RI-600 applies Non-Dispersive Infrared Ray Absorption(NDIR) technique to detect target gas.
The infrared beam emitted from the light source passes through the gas cell and reaches to IR sensor. The
target gas enters into gas cell from gas inlet.
When target gas is entered into gas cell, the amount of infrared ray to be received by IR sensor decreases
since the infrared ray emitted from IR source is absorbed by the target gas.
This decreased amount is detected by IR sensor and output as gas concentration. There is a optical band
pass filter in front of IR sensor which can pass the absorption wave of target gas.
Then, there is no sensitivity for the gas which has the different absorption wave from the target gas.
Furthermore, there is no sensitivity against N2 and H2 etc. which cannot absorb infrared ray.
Dust fuilter
Gas cellInfrared light

Optical filter

CO2 in Air

Infrared Ray

タ

Infrared sensor

Display
Analog output
Contact

11-2. Definition of terms
ppm
vol%Calibration
Maintenancemode

Initial clear

Zero
suppression
Alarm delay time

Gas concentration indicated in the unit of one-millionth of the volume
Gas concentration indicated in the unit of one-hundredth of the volume
Find relationship of the readings, display values or setpoints with the actual values
by using the calibration gas, etc.
When maintenance is performed on the monitor, the alarm contact is disconnected,
and a signal to indicate the maintenance mode status is sent out to the external
output signal. As a result, maintenance can be performed on a single unit of themonitor.
The reading is unstable for seconds after the power is turned on. To prevent
malfunctions for that period, the alarm contact is deactivated. In addition, a signal toindicate the initial clear status is sent out to the external output.
A function to cut off the influences of environmental changes, interference gases,etc.
A function which temporarily suspends activation to prevent a false alarm caused bynoise from its outside.

48

Manual Log
Rev.

Amendment

Issue data

0First issue

2017/7/7

1

P47 correction : Fault alarm display

2017/10/30

2

P45 correction : Troubleshooting

2018/1/18

3

P12, 47 correction : Power supply 100-120VAC±10%(50/60Hz)

2018/8/24

4

Correction : Declaration of Conformity

2020/4/1

5

Added a section on remote sensor.

2021/1/18

6

Declaration of Conformity

2021/11/12

7

Correction : CE Declaration of Conformity,
Addition : UKCA Declaration of Conformity

2022/7/11

8

Correction : CE Declaration of Conformity

2024/6/14