RKI Instruments 73-1205-05K, 73-1205-10K, 73-1205-50K, 73-1205-02K, 73-1205-20K User manual

Indoor Carbon Dioxide Monitor

RI-600

Part Number: 71-0517
Revision: P1
Released: 1/14/20

Operating Manual

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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 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. Suppression function ............................................................................................................................. 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

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1

1. Outline of the Product

Preface

Thank 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 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 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. It is
also 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 by
using 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 with
purposes.

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Definition of DANGER, WARNING, CAUTION and NOTE

Throughout this manual, the following indications are used to ensure safe and effective work.

This message indicates that improper handling may cause serious
damage on life, health or assets.

DANGER

WARNING

CAUTION

This message indicates that improper handling may cause serious
damage on health or assets.

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 marking type
(DC specification only)

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

CE marking

CE marking label (Bottom of instrument)

(DC specification, dry battery type only)

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2

2. Important Notices on

Safety

To maintain the performance of the monitor and use it safely, observe the following instructions with
WARNING and CAUTION.

WARNING

 If an abnormality is found in the monitor, contact RIKEN KEIKI immediately. Visit our Web site to

find your nearest RIKEN KEIKI office.

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.

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 Do not use the monitor with it attached to a control device, equipment, etc.

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 of

high-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 the
monitor properly in accordance with the operating manual.

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 is
used, 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 other

units.

 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, be

sure that excessive pressure is not applied to the power cable and remote sensor cable.

 Do not block the vent for the sensor.

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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

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Power switch

Cable outlet

Cable outlet

Cable outlet

Cable outlet

Display

Sensor

part

Standard accessories

- Cross-recessed pan head
machine screw (2 pcs.)

- Cross-recessed round head
wood 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 the

monitor 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

(Unit: mm)

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Name

Major function

to power off.

˅

3-2. Names and functions for each part

This section describes the names and functions of the individual parts and LCD display that make up the
monitor.

Main unit

(1) Power switch

(2) MODE button

(3) ˄ button

button

(4)

(5) SET button Used to confirm the setting.

(6) Buzzer sound opening Emits operation and judgment sounds. (Do not block it.)

(7) Sensor part Detects a gas to be detected. The sensor is inside the cover.

(8) Screw Loosen this screw to open the case.

Turns the power ON/OFF. Slide the switch up to power on and down

Hold down this button to enter the user mode.
It is also used to cancel or skip during setup.

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

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

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Name

Major function

Maintenance indicator

Display

(1) Operating state display 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 Lights up in red at a fault alarm state.

Concentration value

(5)

display

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

Gas name display

(7)

Maintenance display

(8) AC/DC power display Lights up when the monitor is operating on AC or DC power.

(9) This is not used for the monitor.

(10) This is not used for the monitor.

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

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

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4

How to Install

4.

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 some

places (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 disaster
prevention, 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

<Do not install the monitor in a place with vibrations or shocks.>

suddenly

- Place with high humidity like a bathroom

- Place with bad ventilation such as behind a curtain or under the shadow.

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 or
chemicals, etc.>

When selecting installation points, avoid a place where the monitor is exposed to
liquids such as water, oil, or chemicals.

<Do not install the monitor in a place where the temperature
drops below 0ºC or rises over 40ºC.>

The operating temperature of the monitor is 0 to +40ºC. Install the monitor in a
stable place not exceeding the operating temperature range.

<Do not install the monitor in a place exposed to direct sunlight
or 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 the
monitor, or the monitor cannot adjust to sudden changes in the temperature.

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voltage

<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 is
performed in its inside, where parts of the machinery must be removed to perform maintenance, or
where the monitor cannot be removed because racks or other things prevent access to it. Do not
install 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, when
momentary 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

Allowed time of
momentary
blackout

Others

100 - 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 the
monitor.)

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.

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Power

supply

Power

supply

*SK1, SK2: Surge absorbing part

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 physical

shock, 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 the
receiving side of the b contact.

The specifications for the external output gas alarm contact of the monitor are based on the resistance load
conditions. 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 and
protect 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 same
time, 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 if
necessary.

- It may be recommended that the surge absorbing part should be attached to the contact for certain load
conditions. It must be attached to an appropriate position by checking how the load is activated.

RI-600

Coil

Alarm contact

External relay

(Lower voltage relay)

Load

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.

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

Sudden changes in the temperature may cause the readings not to come back.

Mounting hole (for M4

box

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 and
install 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.

screw)
*Supporting the switch

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

Cable outlet

2

1

4

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Secure as

Installation dimens ion drawing (Installat ion board used)

<Maintenance Space>

If the installation board (option) is used, secure an installation space above the unit so that it can be
installed by sliding.

installation space

Installation dimens ion drawing (Installat ion board not used)
Compatible with JIS s ingle switch box

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For AC power

For DC power

For signal cable (

4 -

20 mA/0

- 1 V)

For contact



When s

tranded wires are used, prevent wires from contacting each other.

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 and
contact.

<Recommended Cables>

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 to

apply stresses on the monitor when (overweight) cables are installed.

 The power and signal cables must be wired separately from the motor power cables.

<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 4.5
mm 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 the

warranty of the performance.

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spring.

Compatible screwdriver manufactured by WAGO

How to connect to terminal plate

When cables (wires) are connected to the terminal plate inside the main unit, use the dedicated
screwdriver 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 screwdriver
or equivalent to open the

2 Insert a wire with a

specified bare wire length
(10 mm) until the end of it
reaches 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 is

within 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 (a
screwdriver with an edge width of 3.0 to 4.5 mm x 0.5 mm which can fully open the spring: See the table
below). In doing this work, be careful not to apply excessive force. Ignoring this may damage the
housing/push buttons or cause dropping off of the push buttons.

Screwdriver (M) straight type 210-120J
Screwdriver (M) straight type (short shaft & grip) 210-350/01

210-657

Screwdriver (M) straight type (insulated shaft type) 210-720

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2: (-)

AC power (TND)

Terminal

board for AC power

Terminal board for DC power

D

C power (TND)

For contact (TN3)

3 -

4: ALM2 (Second)

Figure of terminal plate

The overview of the terminal plate inside the main unit is as follows:

For external output signal
(4 - 20 mA/0 - 1 V) (TN2)
1: (+)

1 - 2: ALM1 (First)

<For Connecting AC Power>

100 - 120 VAC ± 10% (50 Hz/60 Hz)
1: L
2: N
3: Not used

<For Connecting DC Power>

24 VDC ± 10%
1: (+)
2: (-)
3: N.C

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5

5. 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 the
operating 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 an
activated contact from having influences on external circuits.

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<Maintenance Mode (regular maintenance mode)>

<Maintenance Mode>

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

<Gas Alarm Status>

ＣＯ2

(long pressing)

<Fault Alarm Status>

ＣＯ2

WARNING

 When the monitor enters each mode from the detection mode while an alarm is activated, the alarm

contact is released.

(long pressing)

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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.

<Start-up Procedures (approximately 25 seconds for system check of the monitor and alarm
deactivation)>

Power switch

ON

OFF

Power On

▼
▼
▼

Initial clear

(approx. 25 seconds)

▼
▼
▼

Detection mode

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%).

ＣＯ2

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

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Mode

Item LCD display

Details

Version display

adjustment

mode switching

Zero adjustment

Span adjustment

Zero/span

initialization

switching

switching

5-5. Modes

Detection
mode

Maintenance
mode
(User)

Gas

－

Fresh air

Setting display 1-2 CONF

Regular
maintenance

Gas introduction
display

concentration
Gas name

1-0 VER Indicate the program version.

1-1 AIR Not used.

1-3 MMOD Switch to the regular maintenance mode.

2-0 TEST

2-1 ZERO Perform the zero adjustment.

2-2 SPAN Perform the span adjustment.

2-3 SDEF Not used.

Normal state

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)

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 (----)

Maintenance
mode
(Regular
maintenance)

Environmental
setting

Display 2-5 DISP

Factory mode

User mode

2-4 SET

2-6 FMOD Not used.

2-7 UMOD Return to the user mode.

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)

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

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1-1. AIR

1-2. CONF

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 three
seconds.

User mode

1-0. VER

Indicate the program
version.

ＣＯ2

Not used.

Display various setting
values.

1-3. MMOD

Switch to the regular
maintenance mode.

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<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 first
alarm setpoint.

Second Alarm
Setpoint Display

Alarm Delay Time
Display (seconds)

Zero Suppression
Value Display

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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 the
monitor.

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 to
the external output or external contact output terminal of the monitor.

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6

6. Alarm Activation and

Functions

6-1. 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 setpoint
value 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 the

gas 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 is

provided.

alarm setpoint value 1000ppm

950ppm

Hysteresis

50ppm

Contact activation

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(4 -

20 mA)

Initial

2.5mA

Fixed values

Scale over

Trouble

0.5mA

Fixed values

Maintenance mode menu

Air calibration

Alarm setpoint check

Alarm summary check

Date/time check and

setting

2.5mA

Fixed values

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

4～20mA

Status

Normal 4.0～20.0mA

Alarm test 4.0～20.0 mA Depending on test value

External output

22mA

20mA

4mA

2.5mA

0

< 4 - 20 mA Output Table>

External output

22mA Fixed values

2.5mA Fixed values

2.5mA Fixed values

2.5mA Fixed values

2.5mA Fixed values

Scale over

(Display：∩∩∩∩）

Normal

Maintenance

Gas concentration

Full scale

Remarks

Depending on gas

concentration

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Maintenance

item

Maintenance content

Dai

ly

maintenance

Regular

maintenance

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 the

performance as a safety unit.

Power supply
check

Concentration
display check

Alarm test Inspect the alarm circuit by using the alarm test

Span
Adjustment

Gas alarm
check

WARNING

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

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 the
hundeds of ppm under the general air environment.

function.

Perform span adjustment using a calibration gas.

Check the gas alarm using a calibration gas.

 

 

－

－

－







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Item Services

(Verifies that relevant points can be identified on the system.)

Span adjustment

Unit operation

check

parts

About maintenance services

We provide services on regular maintenance including such as 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, 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>

Power supply
check

Concentration
display check

Alarm test

Gas alarm check

Cleaning and
repair of the unit

Replacement of
consumable

Checks the power supply voltage.
Checks 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 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, and
cleans 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 the
settings.

WARNING

 When the adjustment is completed, press the MODE button to return to the measuring state.

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The monitor automatically returns to the measuring state in 10 hours.

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Mode

Item LCD display

Details

Zero adjustment

Span adjustment

Zero/span

initialization

switching

switching

Maintenance
mode
(Regular
maintenance)

Gas introduction
display

Environmental
setting

Display 2-5 DISP

Factory mode

2-0 GAS TEST 2-00: Gas Test

2-1 ZERO Perform the zero adjustment.

2-2 SPAN Perform the span adjustment.

2-3 SDEF Not used.

2-4 SET 2-40: Not used (----)

2-6 F MODE Not used.

2-01: Alarm Test
2-02: Fault Alarm Test
2-03: Display test
2-04: 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)

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 (----)

User mode

2-7 U MODE Return to the user mode.

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(long pressing)

<Regular Maintenance Mode>

User mode

Press the SET button
in "1-3. M MOD".

Then press the SET
button again for three
seconds.

2-0. GAS TEST

Perform a test with the
gas.
Similar to the detection
condition,the reading
changes and an alarm
is displayed after gas
is introduced, but the
“ALM1” and “ALM2” do
not flash and the
contact is not
activated.

2-1. ZERO

Perform the zero
adjustment.

2-2. SPAN

Perform the span
adjustment.

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2-3. SDEF

Not used.

2-4. SET

Specify various
settings.

2-5. DISP

Provide various detail
displays.

2-6. F MODE

Not used.

2-7. U MODE

Return to the user
mode.

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<Gas Introduction Display>

2-0. GAS TEST

Perform a test with the
gas.
Similar to the detection
mode, the reading
changes and an alarm
is displayed after the
gas 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 to
increase the display
value to the alarm
setpoint to trigger an
alarm.

2-02. FALT

Conduct a fault alarm
test.
Use the ˄ or ˅ button
to enable the function
to trigger an alarm.

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To 2-00

2-03. LCD

Perform the LCD
display test.

2-04.

Not used.

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<Zero Adjustment>

2-1. ZERO

Perform the zero
adjustment.

The current
concentration is
displayed.

Supply zero
adjustment gas to the
sensor.

Press the SET button.

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

Zero adjustment will
end.

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<Span Adjustment>

2-2. SPAN

Perform the span
adjustment.

The current
concentration is
displayed.

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

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

Span adjustment will
end.

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<Environmental Setting>

2-4. SET

Specify 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 the
SET button to confirm
it.

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2-46. SAPP

2-43. AL-D

Set the alarm delay
time (seconds).
Use the ˄ or ˅ button
to set the time
(seconds) and press
the SET button to
confirm it.

2-44. AL-T

Not used.

2-45. SP-T

Not used.

S Not used.

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2-48. MA20

Connect an ammeter. Then, use the

˄

Connect an ammeter. Then, use the

˄

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 the
value and press the
SET button to confirm
it.

Adjust the external
output (4 mA, 20 mA).
Connect an ammeter.
Then, use the ˄ or ˅
button to select the
value and press the
SET button to confirm
it.

or ˅ button to adjust output (4
mA) and press the SET button to
confirm it.

2-49. SSET

Not used.

or ˅ button to adjust output (20
mA) and press the SET button to
confirm it.

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2-4A. DATE

Set the date/time.
Use the ˄ or ˅ button
to select each value in
the order of year,
month, day, hour and
minute and press the
SET button to confirm
it.

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2-4b. P-A

Not used.

2-4C. ACAL

Not used.

2-4d. BZZR

Set the buzzer to
ON/OFF.

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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.

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2-4H. LCD

Set the LCD backlight
to ON/OFF.

*No backlight by

standard setting

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

Contact RIKEN KEIKI for information on readjustment including calibration.

8

8. Storage and Disposal

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

long 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

8-3. Disposal of products

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

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Symptom/Display

Causes

Actions

concentration.

impossible

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.

The power cannot
be turned on.

Abnormal
operations

Sensor
abnormalities
E-1

System
abnormalities
E-9 SYSTEM

The reading drops
and it remains so.

The power switch is
turned off.

Abnormalities/momentary
blackout of power supply
system

The main unit is not
installed properly.

Cable abnormalities
(open circuit/not
connected/short circuit)

Fault of AC adapter

The connector of AC
adapter is not
connected correctly.

Disturbances by sudden
surge noise, etc.

The sensor is not
connected 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 the
temperature and CO2

Disturbance by noise

Turn on the power switch.

Provide the rated voltage.
Take measures such as checking or adding the
UPS, power supply line filter and insulation
transformer.

Check whether the main unit is properly attached to
the wall-mounted unit.

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

AC adapter replacement is necessary.
Please contact RIKEN KEIKI.

Connect the AC adapter correctly.

Turn off and restart the monitor.
If a symptom like this is observed frequently, take
appropriate measures to eliminate the noise.

Check that the sensor is connected and the
connectors of the sensor unit board are securely
fastened.

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 the
change of temperature and the CO2 concentration.

Turn off and restart the monitor.
If a symptom like this is observed frequently, take
appropriate measures to eliminate the noise.

Span adjustment

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Improper calibration gas
concentration

Use the proper calibration gas.

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Symptom/Display

Causes

Actions

Deteriorated sensor
sensitivity

Replace the sensor with new one.

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Detection principle

Non-Dispersive Infrared Ray

Gas to be detected

Carbon

di

oxide

No backligh

t by standard setting

Detection range

0 - 2000

ppm / 0 - 5000ppm / 0

-

10000ppm

0 - 2vol% / 0

-

5vol%

Display resolution

0 - 2000

ppm : 1 ppm

/ 2000ppm

-

10000ppm

:10ppm

0 - 2vol%:0.005vol% / 2

-

5vol%:0.010vol%

Detection method

Diffusion type

Alarm setpoint value

0 - 2000

ppm

1st : 1000ppm

/ 2nd : 2000ppm[s

tandard setting

]

0 - 5vol%

1st : 0.5vol% / 2nd : 3.0

vol%[s

tandard setting

]

A

ccuracy

Within

5% for full scale

(to the gas concentration signal output)

Response time

90% response (T90)

within

60 seconds

Gas alarm type

Two-step alarm (H

-

HH)

Gas alarm display

First: Lights up the concentration display and

backlight (orange), buzzer

No backligh

t and no buzzer

by s

tandard setting

Gas alarm pattern

Auto-reset

Gas alarm contact

No-

voltage contact 1a or 1b and

normally de

-

energized (energized in response to an alarm)

Fault alarm/self

diagnosis

System abnormalities/sensor connection abnormalities

Fault alarm display

Alarm detail display and backlight blinking (orange), buzzer

No backligh

t

by s

tandard setting

Fault alarm pattern

Auto-reset

Contact capacity

125 VAC

- 1 A or 30 VDC

- 1 A (resistance load)

Transmission

4 -

20 mA DC (no

-

insulation/load resistance under 300

Ω

)

Power supply

100 –

120

VAC ±10% (50/60 Hz)

or

24 VDC ±10%

Power consumption

AC specification: Max.

6

VA/DC specification: Max.

4 W

Initial clear

Approx. 25 seconds

Warm

-

up time

Approx. 30 minutes

Operating temperatures

0 - 40ºC (At a constant condition)

Operating humidities

Below 90%RH (Non

-

condensing)

Structure

Wall mounting type

External dimensions

Approx. 80 (W) x 120 (H) x 35.5 (D) mm

(projection portions excluded)

Weight

AC specification: Approx. 200 g/DC

specification: Approx. 180 g

10

10. Product Specifications

10-1. List of specifications

Concentration display*1 LCD digital display (Five-digit, seven-segment/green, orange and red backlight)

Under the same test conditions

Under the same test conditions

*

0 - 5000ppm 1st : 1000ppm / 2nd : 5000ppm[standard setting]
0 - 10000ppm 1st : 1000ppm / 2nd : 5000ppm[standard setting]
0 - 2vol% 1st : 0.5vol% / 2nd : 2.0vol%[standard setting]

±

Second: Lights up the concentration display and backlight (red), buzzer

*

*

*2

specifications*3

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Infrared Ray

ppm

vol%

by

using the calibration gas, etc.

suppression

11

11. Appendix

11-1. 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.

Infrared light

Gas cell

CO2

in Air

Dust fuilter

Optical filterタ

Infrared sensor

Display

Analog output

Contact

11-2. Definition of terms

Gas concentration indicated in the unit of one-millionth of the volume

Gas concentration indicated in the unit of one-hundredth of the volume

Calibration Find relationship of the readings, display values or setpoints with the actual values

Maintenance
mode

Initial clear The reading is unstable for seconds after the power is turned on. To prevent

Zero

Alarm delay time A function which temporarily suspends activation to prevent a false alarm caused by

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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 the
monitor.

malfunctions for that period, the alarm contact is deactivated. In addition, a signal to
indicate the initial clear status is sent out to the external output.

A function to cut off the influences of environmental changes, interference gases,
etc.

noise from its outside.

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